An optical time-delay estimate for the double gravitational lens system B1600+434 1 (2007)
I. Burud, J. Hjorth, A. O. Jaunsen, M. I. Andersen, H. Korhonen, J. W. Clasen, ...
and R. stensen Department of Physics
An optical time-delay estimate for the double gravitational lens system B1600+434 (2007)
I. Burud, J. Hjorth, A. O. Jaunsen, M. I. Andersen, H. Korhonen, J. W. Clasen, ...
We present optical I-band light curves of the gravitationally lensed double QSO B1600+434 from observations obtained at the Nordic Optical Telescope (NOT) between April 1998 and November 1999. The...
The Interest In, F. Courbin, C. Lidman, I. Burud, J. Hjorth, P. Magain, ...
this report recent VLT FORS2 observations of HE 1104-1805, a doubly imaged quasar at z=2.319 discovered in the framework of the Hamburg-ESO survey for bright quasars (Wisotzki et al. 1993). The...
High resolution optical and near-IR imaging of the quadruple quasar RX J0911.4+0551 (2007)
I. Burud, F. Courbin, C. Lidman, A. O. Jaunsen, J. Hjorth, M. I. Andersen, ...
We report the detection of four images in the recently discovered lensed QSO RX J0911.4+0551. With a maximum angular separation of 3:1 00 , it is the quadruply imaged QSO with the widest known...
Three photometric methods tested on ground-based data of Q 2237+0305 (2007)
Burud Stabell Magain, I. Burud, R. Stabell, F. Courbin, S. Refsdal, M. Remy
. The Einstein Cross, Q 2237+0305, has been photometrically observed in four bands on two successive nights at NOT (La Palma, Spain) in October 1995. Three independent algorithms have been used to...
About the origin of extinction in the gravitational lens system MG J0414+0534 (2007)
C. Vanderriest, F. Courbin, I. Burud, F. Rigaut
. Photometric measurements of the highly reddened gravitational mirage MG J0414+0534 have been carried out either by PSF subtraction or by applying accurate deconvolution algorithms to optical (R, I)...
Microlensing variability in time-delay quasars (2006)
Paraficz, D., Hjorth, J., Burud, I., Jakobsson, P., Eliasdottir, A.
We have searched for microlensing variability in the light curves of five gravitationally lensed quasars with well-determined time delays: SBS 1520+530, FBQ 0951+2635, RX J0911+0551, B1600+434 and HE...
Long gamma-ray bursts and core-collapse supernovae have different environments (2006)
Fruchter, A.S., Levan, A.J., Strolger, L., Vreeswijk, P.M., Thorsett, S.E., Bersier, D., ...
When massive stars exhaust their fuel they collapse and often produce the extraordinarily bright explosions known as core-collapse supernovae. On occasion, this stellar collapse also powers an even...
Long gamma-ray bursts and core-collapse supernovae have different environments (2006)
Fruchter, A. S., Levan, A. J., Strolger, L., Vreeswijk, P. M., Thorsett, S. E., Bersier, D., ...
When massive stars exhaust their fuel they collapse and often produce the extraordinarily bright explosions known as core-collapse supernovae. On occasion, this stellar collapse also powers an even...
Evidence for a Supernova Associated with the X-ray Flash 020903 (2006)
Bersier, D., Fruchter, A. S., Gorosabel, J., Levan, A., Burud, I., ...
We present ground-based and Hubble Space Telescope optical observations of the X-ray flash (XRF) 020903, covering 300 days. The afterglow showed a very rapid rise in the first day, followed by a...
Microlensing variability in time-delay quasars. (2006)
Paraficz, D., Hjorth, J., Burud, I., Jakobsson, P., Eliasdottir, A.
The lensing system towards the doubly imaged quasar SBS 1520+530 (2005)
Faure, C., Courbin, F., Alloin, D., Bolzonella, M., Burud, I.
The gravitational potential responsible for the lensing effect in SBS 1520+530 is studied over length scales from a few arc-seconds to a few arc-minutes. For this purpose, we use sharply deconvolved...
Courbin, F., Letawe, G., Magain, P., Wisotzki, L., Jablonka, P., Jahnke, K., ...
We present the first result of a comprehensive spectroscopic study of quasar host galaxies. On-axis, spatially resolved spectra of low redshift quasars have been obtained with FORS1, mounted on the...
Nakos, Th, Courbin, F, Poels, Joël, Libbrecht, C, Magain, Pierre, Surdej, Jean, ...
We present the results of two-band CCD photometric monitoring of the gravitationally lensed quasar Q 0142-100 (UM 673). The data, obtained at ESO-La Silla with the 1.54 m Danish telescope in the Gunn...
Nakos, Th., Courbin, F., Poels, J., Libbrecht, C., Magain, P., Surdej, J., ...
We present the results of two-band CCD photometric monitoring of the gravitationally lensed quasar Q 0142-100 (UM 673).The data, obtained at ESO-La Silla with the 1.54 m Danish telescope in the Gunn...
Fynbo, J. P. U., Gorosabel, J., Smette, A., Fruchter, A., Hjorth, J., Pedersen, K., ...
(Abridged) We report on HST observations of the late-time afterglow and host galaxy of GRB021004 (z=2.33). Although this GRB is one of the best observed so far, there is substantial disagreement...
A possible bright blue SN in the afterglow of GRB 020305 (2005)
Gorosabel, J., Fynbo, J. P. U., Fruchter, A., Levan, A., Hjorth, J., Nugent, P., ...
We report on ground-based and HST(+STIS) imaging of the afterglow and host galaxy of the Gamma-Ray Burst (GRB) of March 5 2002. The GRB occurred in a R=25.17+/-0.14 galaxy, which apparently is part...
Nakos, T., Courbin, F., Poels, J., Libbrecht, C., Magain, P., Surdej, J., ...
We present the results of two-band CCD photometric monitoring of the gravitationally lensed quasar Q 0142-100 (UM 673). The data, obtained at ESO-La Silla with the 1.54 m Danish telescope in the Gunn...
Fynbo, J.P.U., Gorosabel, J., Smette, A., Fruchter, A., Hjorth, J., Pedersen, K., ...
We report on Hubble Space Telescope (HST) observations of the late-time afterglow and host galaxy of GRB 021004 (z=2.33). Although this gamma-ray burst (GRB) is one of the best observed so far in...
GRB 020410: A Gamma-Ray Burst Afterglow Discovered by Its Supernova Light (2005)
Levan, A., Nugent, P., Fruchter, A., Burud, I., Branch, D., Rhoads, J., ...
We present the discovery and monitoring of the optical transient (OT) associated with GRB 020410. The fading OT was found by Hubble Space Telescope (HST) observations taken 28 and 65 days after burst...
An optical time delay for the double gravitational lens system FBQ 0951+2635. (2005)
Jakobsson, P., Hjorth, J., Burud, I., Letawe, G., Lidman, C., Courbin, F.
Nakos, T., Courbin, F., Poels, J., Libbrecht, C., Magain, P., Surdej, J., ...
We present the results of two-band CCD photometric monitoring of the gravitationally lensed quasar Q 0142-100 (UM 673). The data, obtained at ESO-La Silla with the 1.54 m Danish telescope in the Gunn...
Nakos, T., Courbin, F., Poels, J., Libbrecht, C., Magain, P., Surdej, J., ...
We present the results of two-band CCD photometric monitoring of the gravitationally lensed quasar Q 0142-100 (UM 673). The data, obtained at ESO-La Silla with the 1.54 m Danish telescope in the Gunn...
Nakos, T., Courbin, F., Poels, J., Libbrecht, C., Magain, P., Surdej, J., ...
We present the results of two-band CCD photometric monitoring of the gravitationally lensed quasar Q 0142-100 (UM 673). The data, obtained at ESO-La Silla with the 1.54 m Danish telescope in the Gunn...
Fynbo, J., Gorosabel, J., Smette, A., Fruchter, A.S., Hjorth, J., Pedersen, K., ...
Original article can be found at : http://www.iop.org/EJ/journal/apj Copyright The American Astronomical Society [Full text of this article is not available in the UHRA]
Nakos, T., Courbin, F., Poels, J., Libbrecht, C., Magain, P., Surdej, J., ...
We present the results of two-band CCD photometric monitoring of the gravitationally lensed quasar Q 0142-100 (UM 673). The data, obtained at ESO-La Silla with the 1.54 m Danish telescope in the Gunn...
Fynbo, J.P.U., Gorosabel, J., Smette, A., Fruchter, A., Hjorth, J., Pedersen, K., ...
We report on Hubble Space Telescope (HST) observations of the late-time afterglow and host galaxy of GRB 021004 (z = 2.33). Although this gamma-rayburst (GRB) is one of the best observed so far in...
An optical time delay for the double gravitational lens system FBQ 0951+2635 (2004)
Jakobsson, P., Hjorth, J., Burud, I., Letawe, G., Lidman, C., Courbin, F.
We present optical R-band light curves of the double gravitationally lensed quasar FBQ 0951+2635 from observations obtained at the Nordic Optical Telescope between March 1999 and June 2001. A time...
GRB 020410: A Gamma-Ray Burst Afterglow Discovered by its Supernova Light (2004)
Levan, A., Nugent, P., Fruchter, A., Burud, I, Branch, D., Rhoads, J., ...
We present the discovery and monitoring of the optical transient (OT) associated with GRB 020410. The fading OT was found by Hubble Space Telescope (HST) observations taken 28 and 65 days after burst...
Vreeswijk, P. M., Ellison, S. L., Ledoux, C., Fynbo, J. P. U., Møller, P., ...
We present photometry and spectroscopy of the afterglow of GRB 030323. VLT spectra of the afterglow show damped Lya (DLA) absorption and low- and high-ionization lines at a redshift z=3.3718+-0.0005....
GRB 011121: Jet, wind and supernova – all in one (2004)
Greiner, J., Klose, S., Salvato, M., Zeh, A., Schwarz, R., Hartmann, D. H., ...
The optical/near-IR spectral energy distribution of the GRB 000210 host galaxy (2004)
Gorosabel, J., Christensen, L., Hjorth, J., Fynbo, J. U., Pedersen, H., Jensen, B. L., ...
GRB 011121: A collimated outflow into wind-blown surroundings (2003)
Greiner, J., Klose, S., Salvato, M., Zeh, A., Schwarz, R., Hartmann, D. H., ...
We discover a break in the GRB 011121 afterglow light curve after 1.3 days, which implies an initial jet opening angle of about 9 deg. The SED during the first four days is achromatic, and supports...
Very high column density and small reddening towards GRB 020124 at z = 3.20 (2003)
Hjorth, J., Møller, P., Gorosabel, J., Fynbo, J. P. U., Toft, S., Jaunsen, A. O., ...
We present optical and near-infrared observations of the dim afterglow of GRB 020124, obtained between 2 and 68 hours after the gamma-ray burst. The burst occurred in a very faint (R > 29.5) Damped...
The afterglow and the host galaxy of GRB 011211 (2003)
Jakobsson, P., Hjorth, J., Fynbo, J. P. U., Gorosabel, J., Pedersen, K., Burud, I., ...
We present optical, near-infrared, and X-ray observations of the optical afterglow (OA) of the X-ray rich, long-duration gamma-ray burst GRB 011211. Hubble Space Telescope (HST) data obtained 14, 26,...
The blue host galaxy of the red GRB 000418 (2003)
Gorosabel, J., Klose, S., Christensen, L., Fynbo, J. P. U., Hjorth, J., Greiner, J., ...
We report on multi-band (UBVRIZJsKs) observations of the host galaxy of the April 18, 2000 gamma-ray burst. The Spectral Energy Distribution (SED) is analysed by fitting empirical and synthetic...
The Building the Bridge survey for z=3 Ly-alpha emitting galaxies I: method and first results (2003)
Fynbo, J. P. U., Ledoux, C., Moller, P., Thomsen, B., Burud, I.
We present the first results of an observational programme at the ESO Very Large Telescope aimed at detecting a large sample of high-redshift galaxies fainter than the current spectroscopic limit of...
Variable polarization in the optical afterglow of GRB 021004 (2003)
Rol, E., Fynbo, J. P. U., Hjorth, J., Gorosabel, J., Egholm, M. P., ...
We present polarimetric observations of the afterglow of gamma-ray burst (GRB) 021004, obtained with the Nordic Optical Telescope (NOT) and the Very Large Telescope (VLT) between 8 and 17 hours after...
Optical and near-infrared observations of the GRB020405 afterglow (2003)
Masetti, N., Palazzi, E., Pian, E., Simoncelli, A., Hunt, L. K., Maiorano, E., ...
(Abridged) We report on observations of the optical and NIR afterglow of GRB020405. Ground-based optical observations started about 1 day after the GRB and spanned a period of ~10 days; archival HST...
The optical/near-IR spectral energy distribution of the GRB 000210 host galaxy (2003)
Gorosabel, J., Christensen, L., Hjorth, J., Fynbo, J. U., Pedersen, H., Jensen, B. L., ...
We report on UBVRIZJsHKs-band photometry of the dark GRB 000210 host galaxy. Fitting a grid of spectral templates to its Spectral Energy Distribution (SED), we derived a photometric redshift...
GRB 011121: A Collimated Outflow into Wind-blown Surroundings (2003)
Greiner, J., Klose, S., Salvato, M., Zeh, A., Schwarz, R., Hartmann, D.H., ...
Patel, S., Kouveliotou, C., Fruchter, A., Rhodes, J., Burud, I., Leven, A., ...
We present our analysis of the Chandra (CXO) x-ray and Hubble (HST) optical observations of the XRF/GRBs 011030 and 020427. With two CXO (ACIS) observations of XRF 011030 (09 & 29 Nov 2001), we have...
GRB 020819: host galaxy at radio position (2003)
Levan, A., Fruchter, A., Rhoads, J., Burud, I., Rol, E., Salamanca, M.I. De, ...
A multi-colour study of the dark GRB 000210 host galaxy and its environment (2003)
Gorosabel, J., Christensen, L., Hjorth, J., Fynbo, J.U., Pedersen, H., Jensen, B.L., ...
We present UBVRIZJsHKs broad band photometry of the host galaxy of the dark gamma-ray burst (GRB) of February 10, 2000. These observations represent the most exhaustive photometry given to date of...
Optical and near-infrared observations of the GRB020405 afterglow (2003)
Masetti, N., Palazzi, E., Pian, E., Simoncelli, A., Hunt, L.K., Maiorano, E., ...
We report on photometric, spectroscopic and polarimetric monitoring of the optical and near-infrared (NIR) afterglow of GRB020405. Ground-based optical observations, performed with 8 different...
Variable polarization in the optical afterglow of GRB 021004 (2003)
Rol, E., Fynbo, J.U., Hjorth, J., Gorosabel, J., Egholm, M.P., ...
We present polarimetric observations of the afterglow of gamma-ray burst (GRB) 021004, obtained with the Nordic Optical Telescope (NOT) and the Very Large Telescope (VLT) between 8 and 17 hours after...
The blue host galaxy of the red GRB 000418 (2003)
Gorosabel, J., Klose, S., Christensen, L., Fynbo, J.U., Hjorth, J., Greiner, J., ...
We report on multi-band (UBVRIZJsKs) observations of the host galaxy of the April 18, 2000 gamma-ray burst. The Spectral Energy Distribution (SED) is analysed by fitting empirical and synthetic...
Very High Column Density and Small Reddening toward GRB 020124 at z=3.20 (2003)
Hjorth, J., Moller, P., Gorosabel, J., Fynbo, J.U., Toft, S., Jaunsen, A.O., ...
We present optical and near-infrared observations of the dim afterglow of GRB 020124, obtained between 2 and 68 hr after the gamma-ray burst. The burst occurred in a very faint (R>~29.5) damped...
GRB 011121: A Collimated Outflow into Wind-blown Surroundings (2003)
Greiner, J., Klose, S., Salvato, M., Zeh, A., Schwartz, R., Hartmann, D.H., ...
We report optical and near-infrared follow-up observations of GRB 011121 collected predominantly at ESO telescopes in Chile. We discover a break in the afterglow light curve after 1.3 days, which...
A multi-colour study of the dark GRB 000210 host galaxy and its environment (2003)
Gorosabel, J., Christensen, L., Hjorth, J., Fynbo, J. U., Pedersen, H., Jensen, B. L., ...
The blue host galaxy of the red GRB 000418 (2003)
Gorosabel, J., Klose, S., Christensen, L., Fynbo, J. P. U., Hjorth, J., Greiner, J., ...
Optical and near-infrared observations of the GRB020405 afterglow (2003)
Masetti, N., Palazzi, E., Pian, E., Simoncelli, A., Hunt, L. K., Maiorano, E., ...
GRB 011121 : a collimated outflow into wind-blown surroundings (2003)
Greiner, J., Klose, S., Salvato, M., Zeh, A., Schwarz, R., Hartmann, D. H., ...
The afterglow and the host galaxy of GRB 011211 (2003)
Jakobsson, P., Hjorth, J., Fynbo, J., Gorosabel, J., Pedersen, K., Burud, I., ...
A multi-colour study of the dark GRB 000210 host galaxy and its environment (2002)
Gorosabel, J., Christensen, L., Hjorth, J., Fynbo, J. U., Pedersen, H., Jensen, B. L., ...
We present UBVRIZJsHKs broad band photometry of the host galaxy of the dark gamma-ray burst (GRB) of February 10, 2000. These observations represent the most exhaustive photometry given to date of...
Courbin, F., Letawe, G., Magain, P., Wisotzki, L., Jablonka, P., Jahnke, K., ...
We present the first result of a comprehensive spectroscopic study of quasar host galaxies. On-axis, spatially resolved spectra of low redshift quasars have been obtained with FORS1, mounted on the...
Time delay and lens redshift for the doubly imaged BAL quasar SBS1520+530 (2002)
Burud, I., Hjorth, J., Courbin, F., Cohen, J. G., Magain, P., Jaunsen, A. O., ...
We present optical R-band light curves of the gravitationally lensed quasar SBS1520+530 derived from data obtained at the Nordic Optical Telescope. A time delay of 130+/-3 days (1 sigma) is...
Building the bridge between Damped Ly-alpha Absorbers and Lyman Break galaxies (2002)
Fynbo, J. P. U., Ledoux, C., Moller, P., Thomsen, B., Burud, I., Leibundgut, B.
In 2000, we started the program ``Building the Bridge between Damped Ly-alpha Absorbers and Lyman-Break Galaxies: Ly-alpha Selection of Galaxies'' at the European Southern Observatory's Very Large...
The lensing system towards the doubly imaged quasar SBS 1520+530 (2002)
Faure, C., Courbin, F., Kneib, J. P., Alloin, D., Bolzonella, M., Burud, I.
The gravitational potential responsible for the lensing effect in SBS 1520+530 is studied over length scales from a few arc-seconds to a few arc-minutes. For this purpose, we use sharply deconvolved...
GRB 020819: OT candidate - confirmation of non variability (2002)
Rol, E., Salamanca, M.I. De, Berg, M. Van Den, Homan, J., Kaper, L., Tanvir, N., ...
Gamma-ray bursts: the most powerful cosmic explosions (2002)
Kaper, L., Castro-Tirado, A.J., Fruchter, A., Greiner, J., Hjorth, J., Pian, E., ...
Contents: The GRACE consortium. GRBs and their afterglows. Evidence for collimation. The origin of GRBs: possible progenitors. The supernova connection. GRB host galaxies.
Confirming no variability for GRB02081 (2002)
Levan, A., Burud, I., Fruchter, A., Rhoads, J., Berg, M. Van Den, Homan, J., ...
The lensing system towards the doubly imaged quasar SBS 1520+530 (2002)
Faure, C., Courbin, F., Alloin, D., Bolzonella, M., Burud, I.
The gravitational potential responsible for the lensing effect in SBS 1520+530 is studied over length scales from a few arc-seconds to a few arc-minutes. For this purpose, we use sharply deconvolved...
Courbin, F., Letawe, G., Magain, P., Wisotzki, L., Jablonka, P., Jahnke, K., ...
We present the first result of a comprehensive spectroscopic study of quasar host galaxies. On-axis, spatially resolved spectra of low redshift quasars have been obtained with FORS1, mounted on the...
The lensing system towards the doubly imaged quasar SBS 1520+530 (2002)
Faure, C., Courbin, F., Alloin, D., Bolzonella, M., Burud, I.
The gravitational potential responsible for the lensing effect in SBS 1520+530 is studied over length scales from a few arc-seconds to a few arc-minutes. For this purpose, we use sharply deconvolved...
Courbin, F., Letawe, G., Magain, P., Wisotzki, L., Jablonka, P., Jahnke, K., ...
We present the first result of a comprehensive spectroscopic study of quasar host galaxies. On-axis, spatially resolved spectra of low redshift quasars have been obtained with FORS1, mounted on the...
An Optical Time-Delay for the Lensed BAL Quasar HE2149-2745 (2001)
Burud, I., Courbin, F., Magain, P., Lidman, C., Hutsemekers, D., ...
We present optical V and i-band light curves of the gravitationally lensed BAL quasar HE2149-2745. The data, obtained with the 1.5m Danish Telescope (ESO-La Silla) between October 1998 and December...
A novel approach for extracting time-delays from lightcurves of lensed quasar images (2001)
Burud, I., Magain, P., Sohy, S., Hjorth, J.
We present a new method to estimate time delays from light curves of lensed quasars. The method is based on chi^2 minimization between the data and a numerical model light curve. A linear variation...
The optical afterglow and host galaxy of GRB000926 (2001)
Fynbo, J. U., Gorosabel, J., Dall, T. H., Hjorth, J., Pedersen, H., Andersen, M. I., ...
We present the discovery of the Optical Transient (OT) of the long-duration gamma-ray burst GRB000926. The optical transient was detected independently with the Nordic Optical Telescope and at Calar...
The afterglow of the short/intermediate-duration gamma-ray burst GRB 000301C: A jet at z=2.04 (2001)
Jensen, B.L., Fynbo, J.U., Gorosabel, J., Hjorth, J., Holland, S., Moller, P., ...
The optical afterglow and host galaxy of GRB 000926 (2001)
Fynbo, J.U., Gorosabel, J., Dall, T.H., Hjorth, J., Pedersen, H., Andersen, M.I., ...
An optical time-delay estimate for the double gravitational lens system B1600+434 (2000)
Burud, I., Hjorth, J., Jaunsen, A. O., Andersen, M. I., Korhonen, H., Clasen, J. W., ...
We present optical I-band light curves of the gravitationally lensed double QSO B1600+434 from observations obtained at the Nordic Optical Telescope (NOT) between April 1998 and November 1999. The...
The afterglow of the short/intermediate-duration gamma-ray burst GRB 000301C: A jet at z=2.04 (2000)
Jensen, B. L., Fynbo, J. U., Gorosabel, J., Hjorth, J., Holland, S., Moller, P., ...
We present Ulysses and NEAR data from the detection of the short or intermediate duration (2 s) gamma-ray burst GRB000301C (2000 March 1.41 UT). The gamma-ray burst (GRB) was localised by the Inter...
Fynbo, J. U., Burud, I., Moller, P.
We present deep imaging in the U, B and I bands obtained under excellent seeing conditions of the double quasar Q0151+048A,B and of the Damped Ly-alpha (DLA) absorbing galaxy at z(abs) = 1.9342 named...
Three photometric methods tested on ground-based data of Q 2237+0305 (1998)
Burud, I., Stabell, R., Magain, P., Courbin, F., Ostensen, R., Refsdal, S., ...
The Einstein Cross, Q~2237+0305, has been photometrically observed in four bands on two successive nights at NOT (La Palma, Spain) in October 1995. Three independent algorithms have been used to...
High resolution optical and near-IR imaging of the quadruple quasar RX J0911.4+0551 (1998)
Burud, I., Courbin, F., Lidman, C., Jaunsen, A., Hjorth, J., Ostensen, R., ...
We report the detection of four images in the recently discovered lensed QSO RX J0911.4+0551. With a maximum angular separation of 3.1", it is the quadruply imaged QSO with the widest known angular...