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...
IFU observations of the GRB 980425/SN 1998bw host galaxy: emission line ratios in GRB regions (2008)
Christensen, L., Vreeswijk, P. M., Sollerman, J., Thoene, C. C., Floc'h, E. Le, Wiersema, K.
The collapsar model predicts that the progenitors of Gamma-ray Bursts (GRBs) are metal poor in Fe group elements. The existence of low metallicity stellar populations could manifest itself through...
Exploring the Outer Solar System with the ESSENCE Supernova Survey (2008)
Becker, A. C., Arraki, K., Kaib, N. A., Wood-Vasey, W. M., Aguilera, C., Blackman, J. W., ...
We report the discovery and orbit determination of 14 trans-Neptunian objects (TNOs) from the ESSENCE Supernova Survey difference imaging dataset. Two additional objects discovered in a similar...
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 a luminous, unusual X-ray transient in the nearby spiral galaxy NGC 2770. We present early spectra of the optical counterpart (1.77 days after the X-ray...
Time Dilation in Type Ia Supernova Spectra at High Redshift (2008)
Blondin, S., Davis, T. M., Krisciunas, K., Schmidt, B. P., Sollerman, J., Wood-Vasey, W. M., ...
We present multiepoch spectra of 13 high-redshift Type Ia supernovae (SNe Ia) drawn from the literature, the ESSENCE and SNLS projects, and our own separate dedicated program on the ESO Very Large...
Constraining the mass of the GRB 030329 progenitor (2008)
Ostlin, G., Zackrisson, E., Sollerman, J., Mattila, S., Hayes, M.
The long-duration gamma-ray burst (GRB) 030329, associated with supernova (SN) 2003dh, occurred inside a star-forming dwarf galaxy at redshift $z=0.1685$. The low redshift, and a rich set of archival...
Constraining Cosmic Evolution of Type Ia Supernovae (2007)
Foley, Ryan J., Filippenko, A. V., Aguilera, C., Becker, A. C., Blondin, S., Challis, P., ...
We present the first large-scale effort of creating composite spectra of high-redshift type Ia supernovae (SNe Ia) and comparing them to low-redshift counterparts. Through the ESSENCE project, we...
The Sloan Digital Sky Survey-II Supernova Survey: Technical Summary (2007)
Frieman, Joshua A., Bassett, B., Becker, A., Choi, C., Cinabro, D., DeJongh, F., ...
The Sloan Digital Sky Survey-II (SDSS-II) has embarked on a multi-year project to identify and measure light curves for intermediate-redshift (0.05 < z < 0.35) Type Ia supernovae (SNe Ia) using...
Meikle, W. P. S., Mattila, S., Pastorello, A., Gerardy, C. L., Kotak, R., Sollerman, J., ...
We present a new, detailed analysis of late-time mid-infrared observations of the Type II-P supernova (SN) 2003gd. At about 16 months after the explosion, the mid-IR flux is consistent with emission...
Ruiz-Velasco, A. E., Swan, H., Troja, E., Malesani, D., Fynbo, J. P. U., Starling, R. L. C., ...
We report on follow-up observations of the GRB 060927 using the ROTSE-IIIa telescope and a suite of larger aperture ground-based telescopes. An optical afterglow was detected 20 s after the burst,...
Meikle, W. P. S., Mattila, S., Pastorello, A., Gerardy, C. L., Kotak, R., Sollerman, J., ...
We present a new, detailed analysis of late-time mid-infrared (IR) observations of the Type II-P supernova (SN) 2003gd. At about 16 months after the explosion, the mid-IR flux is consistent with...
SN 2003du: 480 days in the Life of a Normal Type Ia Supernova (2007)
Stanishev, V., Goobar, A., Benetti, S., Kotak, R., Pignata, G., Navasardyan, H., ...
An extensive set of optical and NIR photometry and low-resolution spectra the Type Ia supernova (SN Ia) 2003du was obtained using a number of facilities. The observations started 13 days before...
No supernovae detected in two long-duration Gamma-Ray Bursts (2007)
Watson, D., Fynbo, J. P. U., Thöne, C. C., Sollerman, J.
There is strong evidence that long duration gamma-ray bursts (GRBs) are produced during the collapse of a massive star. In the standard version of the Collapsar model, a broad-lined and luminous 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...
Mattila, S., Vaisanen, P., Farrah, D., Efstathiou, A., Meikle, W. P. S., Dahlen, T., ...
We report a supernova discovery in Ks-band images from the NAOS CONICA adaptive optics (AO) system on the ESO Very Large Telescope (VLT). The images were obtained as part of a near-infrared search...
Watson, D., Hjorth, J., Fynbo, J. P. U., Jakobsson, P., Foley, S., Sollerman, J., ...
We compare the HI column densities from Ly-alpha absorption to the metal column densities from X-ray absorption in gamma-ray burst (GRB) afterglows. Eight bursts of seventeen entering the sample,...
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...
Davis, T. M., Mortsell, E., Sollerman, J., Becker, A. C., Blondin, S., Challis, P., ...
The first cosmological results from the ESSENCE supernova survey (Wood-Vasey et al. 2007) are extended to a wider range of cosmological models including dynamical dark energy and non-standard...
The nature of the dwarf starforming galaxy associated with GRB 060218 / SN2006aj (2007)
Wiersema, K., Savaglio, S., Vreeswijk, P. M., Ellison, S. L., Ledoux, C., ...
We present high resolution VLT UVES and low resolution FORS optical spectroscopy of supernova 2006aj and its host galaxy, associated with the nearby (z = 0.03342) gamma-ray burst GRB 060218. This...
Wood-Vasey, W. M., Miknaitis, G., Stubbs, C. W., Jha, S., Riess, A. G., Garnavich, P. M., ...
We present constraints on the dark energy equation-of-state parameter, w=P/(rho c^2), using 60 Type Ia supernovae (SNe Ia) from the ESSENCE supernova survey. We derive a set of constraints on the...
The ESSENCE Supernova Survey: Survey Optimization, Observations, and Supernova Photometry (2007)
Miknaitis, G., Pignata, G., Rest, A., Wood-Vasey, W. M., Blondin, S., Challis, P., ...
We describe the implementation and optimization of the ESSENCE supernova survey, which we have undertaken to measure the equation of state parameter of the dark energy. We present a method for...
SN 2003du: 480 days in the life of a normal type Ia supernova (2007)
Stanishev, V., Goobar, A., Benetti, S., Kotak, R., Pignata, G., Navasardyan, H., ...
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., ...
The peculiar type Ia supernova 2005hk (2007)
Stanishev, V., Taubenberger, S., Blanc, G., Anupama, G. C., Benetti, S., Cappellaro, E., ...
Mattila, S., Vaisanen, P., Farrah, D., Efstathiou, A., Meikle, W. P. S., Dahlen, T., ...
Publicación ISI
Mattila, S., Vaisanen, P., Farrah, D., Efstathiou, A., Meikle, W. P. S., Dahlen, T., ...
Publicación ISI
The Peculiar Type Ia Supernova 2005hk (2006)
Stanishev, V., Taubenberger, S., Blanc, G., Anupama, G. C., Benetti, S., Cappellaro, E., ...
We present a preliminary analysis of an extensive set of optical observations of the Type Ia SN 2005hk. We show that the evolution of SN 2005hk closely follows that of the peculiar SN 2002cx. SN...
A Spitzer Space Telescope study of Sn 2002hh: An infrared echo from a Type IIP supernova (2006)
Meikle, W. P. S., Mattila, S., Gerardy, C. L., Kotak, R., Pozzo, M., Van Dyk, S. D., ...
We present late-time (590-994 days) mid-IR photometry of the normal but highly reddened Type IIP supernova SN 2002hh. Bright, cool, slowly fading emission is detected from the direction of the...
HI column densities of z > 2 Swift gamma-ray bursts (2006)
Jakobsson, P., Fynbo, J. P. U., Ledoux, C., Vreeswijk, P., Kann, D. A., Hjorth, J., ...
Context: Before the launch of the Swift satellite, the majority of the gamma-ray burst (GRB) afterglows for which Ly-alpha was redshifted into the observable spectrum showed evidence for a damped...
Optical and near infrared observations of SN 1998bu (2006)
Spyromilio, J., Gilmozzi, R., Sollerman, J., Leibundgut, L., Fransson, C.
Infrared and optical spectra of SN 1998bu at an age of one year after explosion are presented. The data show evidence for the radioactive decay of 56Co to 56Fe, long assumed to be the powering source...
A Spitzer Space Telescope study of SN 2002hh: an infrared echo from a Type IIP supernova (2006)
Meikle, W. P. S., Mattila, S., Gerardy, C. L., Kotak, R., Pozzo, M., Van Dyk, S. D., ...
We present late-time (590-994 d) mid-IR photometry of the normal, but highly-reddened Type IIP supernova SN 2002hh. Bright, cool, slowly-fading emission is detected from the direction of the...
The GRB 060218/SN 2006aj event in the context of other Gamma-Ray Burst Supernovae (2006)
Ferrero, P., Kann, D. A., Zeh, A., Klose, S., Pian, E., Palazzi, E., ...
The supernova SN 2006aj associated with GRB 060218 is the second-closest GRB-SN observed to date (z=0.033). We present Very Large Telescope, Liverpool Telescope, and Katzman Automatic Imaging...
Are short gamma-ray bursts collimated? GRB050709, a flare but no break (2006)
Watson, D., Hjorth, J., Jakobsson, P., Xu, D., Fynbo, J. P. U., Sollerman, J., ...
From the small sample of afterglow lightcurves of short duration gamma-ray bursts (GRBs), the decays are rapid, roughly following a power-law in time. It has been assumed that the afterglow emission...
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...
An optical supernova associated with the X-ray flash XRF 060218 (2006)
Pian, E., Mazzali, P. A., Masetti, N., Ferrero, P., Klose, S., Palazzi, E., ...
Long-duration gamma-ray bursts (GRBs) are associated with type Ic supernovae that are more luminous than average and that eject material at very high velocities. Less-luminous supernovae were not...
A Mean Redshift of 2.8 for Swift gamma - ray bursts (2006)
Jakobsson, P., Levan, A., Fynbo, J., Priddey, R., Hjorth, J., Tanvir, N., ...
Probing Cosmic Chemical Evolution with Gamma-Ray Bursts: GRB060206 at z=4.048 (2006)
Fynbo, J. P. U., Starling, R. L. C., Ledoux, C., Wiersema, K., Thöne, C. C., Sollerman, J., ...
Aim: We present early optical spectroscopy of the afterglow of the gamma-ray burst GRB 060206 with the aim of determining the metallicity of the GRB absorber and the physical conditions in the...
Optical and infrared observations of the Type IIP SN2002hh from day 3 to 397 (2006)
Pozzo, M., Meikle, W. P. S., Rayner, J. T., Joseph, R. D., Filippenko, A. V., Foley, R. J., ...
We present optical and infrared (IR) observations of the type IIP SN2002hh from 3 to 397 days after explosion. The optical spectroscopic (4-397d) and photometric (3-278d) data are complemented by...
GRB 050814 at z = 5.3 and the Redshift Distribution of Swift GRBs (2006)
Jakobsson, P., Levan, A., Fynbo, J. P. U., Priddey, R., Hjorth, J., Tanvir, N., ...
We report optical, near-infrared and X-ray observations of the afterglow of GRB 050814, which was seen to exhibit very red optical colours. By modelling its spectral energy distribution we find that...
Probing cosmic chemical evolution with gamma-ray bursts: GRB 060206 at z=4.048 (2006)
Fynbo, J.P.U., Starling, R.L.C., Ledoux, C., Wiersema, K., Thone, C.C., Sollerman, J., ...
An optical supernova associated with the X-ray flash XRF 060218 (2006)
Pian, E., Mazzali, P. A., Masetti, N., Ferrero, P., Klose, S., Palazzi, E., ...
The GRB 060218/SN 2006aj event in the context of other gamma-ray burst supernovae (2006)
Ferrero, P., Kann, D. A., Zeh, A., Klose, S., Pian, E., Palazzi, E., ...
The GRB 060218/SN 2006aj event in the context of other gamma-ray burst supernovae (2006)
Ferrero, P., Kann, D. A., Zeh, A., Klose, S., Pian, E., Palazzi, E., ...
Watson, D., Fynbo, J.P.U., Ledoux, C., Vreeswijk, P., Hjorth, J., Smette, A., ...
The optical afterglow spectrum of GRB 050401 (at z=2.8992+/-0.0004) shows the presence of a damped Lyalpha absorber (DLA), with logNHI=22.6+/-0.3. This is the highest column density ever observed in...
The Short Gamma-Ray Burst Revolution (2006)
Hjorth, J., Levan, A., Tanvir, N., Starling, R., Klose, S., Kouveliotou, C., ...
Not Available
The GRB 060218/SN 2006aj event in the context of other gamma-ray burst supernovae. (2006)
Ferrero, P., Kann, D.A., Zeh, A., Klose, S., Pian, E., Palazzi, E., ...
Probing cosmic chemical evolution with gamma-ray bursts: GRB 060206 at z = 4.048. (2006)
Fynbo, J., Starling, R.L., Ledoux, C., Wiersema, K., Thoene, C.C., Sollerman, J., ...
No supernovae associated with two long-duration gamma ray bursts. (2006)
Fynbo, J.P.U., Watson, D., Thoene, C.C., Sollerman, J., Bloom, J.S., Davis, T.M., ...
The Short Gamma-Ray Burst Revolution. (2006)
Hjorth, J., Levan, A., Tanvir, N., Starling, R.L., Klose, S., Kouveliotou, C., ...
Are short y-ray bursts collimated GRB 050709, a flare but no break. (2006)
Watson, D., Hjorth, J., Jakobsson, P., Xu, D., Fynbo, J.P.U., Sollerman, J., ...
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., ...
An optical supernova associated with the X-ray flash XRF 060218 (2006)
Pian, E., Mazzali, P.A., Masetti, N., Ferrero, P., Klose, S., Palazzi, E., ...
Long-duration gamma-ray bursts (GRBs) are associated with type Ic supernovae that are more luminous than average and that eject material at very high velocities. Less-luminous supernovae were not...
The Short Gamma-Ray Burst Revolution (2006)
Hjorth, J., Levan, A.J., Tanvir, N., Starling, R., Klose, S., Kouveliotou, C., ...
Swift, a dedicated gamma-ray burst (GRB) satellite with ultrarapid slewing capability, and a suite of ground-based (ESO) telescopes have recently achieved a major breakthrough: detecting the first...
The galaxies in the field of the nearby GRB980425/SN1998bw (2005)
Foley, S., Watson, D., Gorosabel, J., Fynbo, J. P. U., Sollerman, J., McGlynn, S., ...
We present spectroscopic observations of ESO 184-G82, the host galaxy of GRB980425/SN1998bw, and six galaxies in its field. A host redshift of z=0.0087+/-0.0006 is derived, consistent with that...
A log N(HI) = 22.6 DLA in a dark gamma-ray burst: the environment of GRB 050401 (2005)
Watson, D., Fynbo, J. P. U., Ledoux, C., Vreeswijk, P., Hjorth, J., Smette, A., ...
The optical afterglow spectrum of GRB050401 (at z=2.8992+/-0.0004) shows the presence of a DLA, with log(nHI)=22.6+/-0.3. This is the highest column density ever observed in a DLA, and is about five...
Using Line Profiles to Test the Fraternity of Type Ia Supernovae at High and Low Redshifts (2005)
Blondin, S., Dessart, L., Leibundgut, B., Branch, D., Hoeflich, P., Tonry, J. L., ...
Using archival data of low-redshift (z < 0.01) Type Ia supernovae (SN Ia) and recent observations of high-redshift (0.16 < z 1.7] SN Ia, which are also subluminous. In addition, we give the first...
The host galaxy cluster of the short gamma-ray burst GRB 050509B (2005)
Pedersen, K., Eliasdottir, A., Hjorth, J., Starling, R., Cerón, J. M. Castro, Fynbo, J. P. U., ...
The first arcsecond localization of a short gamma-ray burst, GRB 050509B, has enabled detailed studies of a short burst environment. We here report on studies of the environment of GRB 050509B using...
A mean redshift of 2.8 for Swift gamma-ray bursts (2005)
Jakobsson, P., Levan, A., Fynbo, J. P. U., Priddey, R., Hjorth, J., Tanvir, N., ...
The exceptionally high luminosities of gamma-ray bursts (GRBs), gradually emerging as extremely useful probes of star formation, make them promising tools for exploration of the high-redshift...
Watson, D., Reeves, J. N., Hjorth, J., Fynbo, J. P. U., Jakobsson, P., Pedersen, K., ...
Gamma-ray burst (GRB) 050904 is the mos