Early spectroscopic identification of SN 2008D. (2009)
Malesani, D., Fynbo, J.P.U., Hjorth, J., Leloudas, G., Sollerman, J., Stritzinger, M., ...
Original article can be found at: http://www.iop.org/EJ/journal/apjl Copyright American Astronomical Society DOI: 10.1088/0004-637X/692/2/L84 [Full text of this article is not available in the UHRA]
Elíasdóttir, Á., Fynbo, J. P. U., Hjorth, J., Ledoux, C., Watson, D., Andersen, A. C., ...
We report the clear detection of the 2175A dust absorption feature in the optical afterglow spectrum of the gamma-ray burst (GRB) GRB070802 at a redshift of z=2.45. This is the highest redshift for a...
Early spectroscopic identification of SN 2008D (2008)
Malesani, D., Fynbo, J. P. U., Hjorth, J., Leloudas, G., Sollerman, J., Stritzinger, M. D., ...
SN 2008D was discovered while following up an unusually bright X-ray transient in the nearby spiral galaxy NGC 2770. We present early optical spectra (obtained 1.75 days after the X-ray transient)...
GRB 070306: A Highly Extinguished Afterglow (2008)
Jaunsen, A. O., Rol, E., Watson, D. J., Malesani, D., Fynbo, J. P. U., Milvang-Jensen, B., ...
We report on the highly extinguished afterglow of GRB 070306 and the properties of the host galaxy. An optical afterglow was not detected at the location of the burst, but in near-infrared a doubling...
The extreme, red afterglow of GRB 060923A: Distance or dust? (2008)
Tanvir, N. R., Levan, A. J., Rol, E., Starling, R. L. C., Gorosabel, J., Priddey, R. S., ...
Gamma-ray bursts are powerful probes of the early universe, but locating and identifying very distant GRBs remains challenging. We report here the discovery of the K-band afterglow of Swift GRB...
The extreme red afterglow of GRB 060923: distance or dust? (2008)
Tanvir, N., Levan, A., Rol, E., Starling, R.L., Gorosabel, J., Priddey, R., ...
‘The definitive version is available at www.blackwell-synergy.com.’ Copyright Blackwell Publishing DOI: 10.1111/j.1365-2966.2008.13496.x
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...
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...
. The gravitationally lensed quasar B1600+434 (z = 1:61, mV = 21:6) has been observed at the 2.56m Nordic Optical Telescope (NOT). In this Letter we report the discovery of an edge-on late-type...
Gamma-ray burst host galaxies and the link to star-formation (2007)
Fynbo, J. P. U., Hjorth, J., Malesani, D., Sollerman, J., Watson, D., Jakobsson, P, ...
We briefly review the current status of the study of long-duration gamma-ray burst (GRB) host galaxies. GRB host galaxies are mainly interesting to study for two reasons: 1) they may help us...
A Search for Host Galaxies of 24 Gamma-Ray Bursts (2007)
Jaunsen, A. O., Fynbo, J. P. U., Hjorth, J., Thoene, C. C., Feron, C., ...
We report the results from observations of 24 gamma ray burst (GRB) fields from 2005 and 2006 undertaken at the Danish 1.54m telescope at ESO/La Silla. Photometry and positions for two previously...
The nature of the X-Ray Flash of August 24 2005 (2007)
Sollerman, J., Fynbo, J. P. U., Gorosabel, J., Halpern, J. P., Hjorth, J., Jakobsson, P., ...
We present comprehensive photometric R-band observations of the fading optical afterglow of the X-Ray Flash XRF050824, from 11 minutes to 104 days after the burst. The R-band lightcurve of the...
The nature of the x-ray flash of August 24 2005. (2007)
Sollerman, J., Fynbo, J., Gorosabel, J., Halpern, J.P., Hjorth, J., Jakobsson, P., ...
Fundamental Properties of GRB-Selected Galaxies: A Swift/VLT Legacy Survey. (2007)
Jakobsson, P., Hjorth, J., Fynbo, J.P.U., Gorosabel, J., Jaunsen, A.O.
Vreeswijk, P. M., Ledoux, C., Smette, A., Ellison, S. L., Jaunsen, A. O., Andersen, M. I., ...
Publicación ISI
Vreeswijk, P. M., Ledoux, C., Smette, A., Ellison, S. L., Jaunsen, A. O., Andersen, M. I., ...
Publicación ISI
Fundamental Properties of GRB-Selected Galaxies: A Swift/VLT Legacy Survey (2006)
Jakobsson, P., Hjorth, J., Fynbo, J. P. U., Gorosabel, J., Jaunsen, A. O.
We present the motivation, aims and preliminary result from the Swift/VLT legacy survey on gamma-ray burst host galaxies. This survey will produce a homogeneous and well-understood host sample...
Supernova 2006aj and the associated X-Ray Flash 060218 (2006)
Sollerman, J., Jaunsen, A. O., Fynbo, J. P. U., Hjorth, J., Jakobsson, P., Stritzinger, M., ...
We have studied the afterglow of the gamma-ray burst (GRB) of February 18, 2006. This is a nearby long GRB, with a very low peak energy, and is therefore classified as an X-ray Flash (XRF). XRF...
Supernova 2006aj and the associated X-Ray Flash 060218. (2006)
Sollerman, J., Jaunsen, A.O., Fynbo, J.P.U., Hjorth, J., Jakobsson, P., Stritzinger, I.M., ...
Discovery of a high-redshift Einstein ring (2005)
Cabanac, R. A., Valls-Gabaud, D., Jaunsen, A. O., Lidman, C., Jerjen, H.
We report the discovery of a partial Einstein ring of radius 1.48arcsec produced by a massive (and seemingly isolated) elliptical galaxy. The spectroscopic follow-up at the VLT reveals a 2L* galaxy...
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., ...
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 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 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...
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...
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...
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., ...
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...
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...
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.
GRB 020418, optical/near-IR observations (2002)
Gorosabel, J., Hjorth, J., Jakobsson, P., Rasmussen, J., Jensen, B.L., Pedersen, H., ...
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...
The Host Galaxy and Optical Light Curve of the Gamma-Ray Burst GRB 980703 (2001)
Holland, S., Fynbo, J. P. U., Hjorth, J., Gorosabel, J., Pedersen, H., Andersen, M. I., ...
We present deep HST/STIS and ground-based photometry of the host galaxy of the gamma-ray burst GRB 980703 taken 17, 551, 710, and 716 days after the burst. We find that the host is a blue, slightly...
Rognvaldsson, O.E., Greve, T.R., Hjorth, J., Gudmundsson, E.H., Sigmundsson, V.S., Jakobsson, P., ...
VLT identification of the optical afterglow of the gamma-ray burst GRB 000131 at z=4.50 (2000)
Andersen, M. I., Hjorth, J., Pedersen, H., Jensen, B. L., Hunt, L. K., Gorosabel, J., ...
We report the discovery of the gamma-ray burst GRB 000131 and its optical afterglow. The optical identification was made with the VLT 84 hours after the burst following a BATSE detection and an Inter...
Rognvaldsson, O. E., Greve, T. R., Hjorth, J., Gudmundsson, E. H., Sigmundsson, V. S., Jakobsson, P., ...
We have obtained U and R band observations of the depletion of background galaxies due to the gravitational lensing of the galaxy cluster CL0024+1654 (z=0.39). The radial depletion curves show a...
HST/STIS Imaging of the Host Galaxy of GRB980425/SN1998bw (2000)
Fynbo, J. U., Holland, S., Andersen, M. I., Thomsen, B., Hjorth, J., Bjornsson, G., ...
We present HST/STIS observations of ESO 184-G82, the host galaxy of the gamma-ray burst GRB 980425 associated with the peculiar Type Ic supernova SN1998bw. ESO 184-G82 is found to be an actively star...
The jet and circumburst stellar wind of GRB 980519 (2000)
Jaunsen, A. O., Hjorth, J., Bjornsson, G., Andersen, M. I., Pedersen, H., Kjernsmo, K., ...
We present extensive multi-colour (UBVR_CI_C) photometry of the optical afterglow of GRB 980519. Upon discovery, 8.3 hours after the burst, the source was decaying as a power law, (t-t_GRB)^alpha,...
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...
Soucail, G., Kneib, J. P., Jaunsen, A. O., Hjorth, J., Hattori, M., Yamada, T.
We present new optical data on the cluster AX J2019+1127 identified by the X-ray satellite ASCA at z\sim 1 (Hattori et al. 1997). The data suggest the presence of a high-redshift cluster of galaxies...
VLT identification of the optical afterglow of the gamma-ray burst GRB 000131 at z=4.50 (2000)
Andersen, M.I., Hjorth, J., Pedersen, H., Jensen, B.L., Hunt, L.K., Gorosabel, J., ...
The optical/IR counterpart of the 3 July 1998 gamma-ray burst and its evolution (1998)
Castro-Tirado, A. J., Zapatero-Osorio, M. R., Gorosabel, J., Greiner, J., Heidt, J., Herranz, D., ...
We imaged the X-ray error box of GRB 980703, beginning 22.5 hours after the gamma--ray event, in both the optical R and near-infrared H bands. A fading optical/IR object was detected within the X-ray...
Evidence for Diverse Optical Emission from Gamma-Ray Burst Sources (1997)
Pedersen, H., Jaunsen, A. O., Grav, T., Ostensen, R., Andersen, M. I., Wold, M., ...
Optical Transients from gamma-ray burst sources, in addition to offering a distance determination, convey important information on the physics of the emission mechanism, and perhaps also about the...
The geometry of the quadruply imaged quasar PG 1115+080; implications for Ho (1997)
Courbin, F., Magain, P., Keeton, C. R., Kochanek, C. S., Vanderriest, C., Jaunsen, A. O., ...
Time delay measurements have recently been reported for the lensed quasar PG 1115+080. These measurements can be used to derive Ho, but only if we can constrain the lensing potential. We have applied...
The gravitationally lensed quasar B1600+434 (z=1.61, mV=21.6) has been observed at the 2.56m Nordic Optical Telescope (NOT). In this Letter we report the discovery of an edge-on late-type galaxy...
The Quadruple Gravitational Lens PG1115+080: Time Delays and Models (1996)
Schechter, P. L., Bailyn, C. D., Barr, R., Barvainis, R., Becker, C. M., Bernstein, G. M., ...
Optical photometry is presented for the quadruple gravitational lens PG1115+080. A preliminary reduction of data taken from November 1995 to June 1996 gives component ``C'' leading component ``B'' by...
Gravitational Lenses Among Highly Luminous Quasars: Large Optical Surveys (1996)
Claeskens, J F, Jaunsen, A O, Surdej, Jean
Astrophysical applications of gravitational lensing: the 173rd Symposium of the International Astronomical Union
Ground-based and HST Direct Imaging of HLQs (1996)
Surdej, Jean, Jaunsen, A O, Claeskens, J*-F, Gonzaga, S, Pospieszalska-Surdej, A, Pirenne, B, ...
IAU Symposium 173, “Gravitational Lensing”
Monitoring of the Einstein Cross with the Nordic Optical Telscope (1995)
Oestensen, R., Refsdal, S., Stabell, R., Teuber, J., Emanuelsen, P. I., Festin, L., ...
We report results from five years of monitoring of the Einstein Cross (Q 2237+0305) with the Nordic Optical Telescope. The photometry, mainly in the R and I bands, has been performed by a PSF fitting...
The NOT GL survey for multiply imaged quasars (1995)
Jaunsen, A. O., Jablonski, M., Pettersen, B. R., Stabell, R.
A gravitational lens (GL)-search program, initiated in 1990 at the Nordic Optical Telescope (NOT), has revealed several possible GL-candidates among a sample of 168 quasars (QSOs), chosen from three...