Perez-Ramirez, D., Postigo, A. De Ugarte, Gorosabel, J., Aloy, M. A., Guerrero, M. A., Osborne, J. P., ...
Aims: We present multiwavelength observations of the most distant gamma-ray burst detected so far GRB 080913 and study whether it can be considered a short-duration GRB and the implications for the...
Castro-Tirado, Alberto J., Ugarte Postigo, A. De, Gorosabel, J., Jelínek, M., Fatkhullin, T. A., Sokolov, V. B., ...
This work is based on observations carried out with the 0.3-m robotic telescope at the Spanish BOOTES-2 astronomical station of the Estación Experimental de La Mayora (CSIC), the 0.4-m WATCHER...
Optical and infrared flares from a transient Galactic soft gamma-ray repeater (2008)
Castro-Tirado, A. J., Postigo, A. De Ugarte, Gorosabel, J., Jelinek, M., Fatkhullin, T. A., Sokolov, V. V., ...
Soft gamma-ray repeaters (SGRs) are a rare type of gamma-ray transient sources that are ocasionally detected as bursts in the high-energy sky. They are thought to be produced by magnetars, young...
The stellar-wind envelope around the supernova XRF/GRB060218/SN2006aj massive progenitor star (2008)
Sonbas, E., Moskvitin, A. S., Fatkhullin, T. A., Sokolov, V. V., Castro-Tirado, A., Postigo, A. De Ugarte, ...
In BTA spectra of the supernova SN2006aj, identified with the X-ray flash (XRF) and gamma-ray burst XRF/GRB060218/SN2006aj, we detected details interpreted as hydrogen lines, which is a sign of...
The short-duration GRB 050724 host galaxy in the context of the long-duration GRB hosts (2007)
Gorosabel, Javier, Castro-Tirado, A.J., Guziy, S., Reverte, D., Antonelli, A., ...
We report optical and near-infrared broad band observations of the short-duration GRB 050724 host galaxy, used to construct its spectral energy distribution (SED). Unlike the hosts of long-duration...
The dark nature of GRB 051022 and its host galaxy (2007)
Castro-Tirado, A. J, Bremer, M, McBreen, S, Gorosabel, J, Guziy, S, Fakthullin, T. A, ...
Aims.We present multiwavelength (X-ray/optical/near-infrared/millimetre) observations of GRB 051022 between 2.5 h and ~1.15 yr after the event. It is the most intense gamma-ray burst (~10-4 erg cm-2)...
The dark nature of GRB 051022 and its host galaxy (2007)
Castro-Tirado, A. J., Bremer, M., McBreen, S., Gorosabel, J., Guziy, S., Delgado, R. M. Gonzalez, ...
We present multiwavelength (X-ray/optical/near-infrared/millimetre) observations of GRB 051022 between 2.5 hours and ~1.15 yr after the event. It is the most intense gamma-ray burst (~ 10^-4 erg...
GRB 060206 and the quandary of achromatic breaks in afterglow light curves (2007)
Curran, P. A., Van Der Horst, A. J., Starling, R. L. C., Castro-Tirado, A. J., Fynbo, J. P. U., ...
Gamma-ray burst afterglow observations in the Swift era have a perceived lack of achromatic jet breaks compared to the BeppoSAX era. We present our multi-wavelength analysis of GRB 060206 as an...
GRB 051028: an intrinsically faint GRB at high redshift? (2007)
Castro-Tirado, A. J., Jelinek, M., Pandey, S. B., McBreen, S., De Jong, J., Sahu, D. K., ...
We present multiwavelength observations of the gamma-ray burst GRB 051028 detected by HETE-2 in order to derive its afterglow emission parameters and to determine the reason for its optical faintness...
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., ...
The dark nature of GRB 051022 and its host galaxy (2007)
Castro-Tirado, A. J., Bremer, M., McBreen, S., Gorosabel, J., Guziy, S., Fakthullin, T. A., ...
GRB 060206 and the quandary of achromatic breaks in afterglow light curves. (2007)
Curran, P., Van Der Horst, A.J., Starling, R.L., Castro-Tirado, A.J., Fynbo, J.P.U., ...
Postigo, A De Ugarte, Fatkhullin, T. A., Johannesson, G., Gorosabel, J., Sokolov, V. V., Castro-Tirado, A. J., ...
Aims. Understand the shape and implications of the multiband light curve of GRB 050408, an X-ray rich (XRR) burst. Methods. We present a multiband optical light curve, covering the time from the...
GRB 050904 at redshift 6.3: observations of the oldest cosmic explosion after the Big Bang (2006)
Tagliaferri, G., A. Antonelli, L., Chincarini, G., Fernández-Soto, A., Malesani, D., Valle Della, M., ...
We present optical and near-infrared observations of the afterglow of the gamma-ray burst GRB 050904. We derive a photometric redshift z = 6.3, estimated from the presence of the Lyman break falling...
GRB 050904 at redshift 6.3: observations of the oldest cosmic explosion after the Big Bang (2006)
Tagliaferri, G., A. Antonelli, L., Chincarini, G., Fernández-Soto, A., Malesani, D., Valle Della, M., ...
We present optical and near-infrared observations of the afterglow of the gamma-ray burst GRB 050904. We derive a photometric redshift z = 6.3, estimated from the presence of the Lyman break falling...
GRB 050904 at redshift 6.3: observations of the oldest cosmic explosion after the Big Bang (2006)
Tagliaferri, G., A. Antonelli, L., Chincarini, G., Fernández-Soto, A., Malesani, D., Valle Della, M., ...
We present optical and near-infrared observations of the afterglow of the gamma-ray burst GRB 050904. We derive a photometric redshift z = 6.3, estimated from the presence of the Lyman break falling...
Detection of optical linear polarization in the SN2006aj/XRF060218 non-spherical expansion (2006)
Gorosabel, J., Larionov, V., Castro-Tirado, A. J., Guziy, S., Larionova, L., Del Olmo, A., ...
We have performed optical polarimetric observations of the SN2006aj associated to the X-ray flash (XRF) of February 18, 2006, XRF060218 that provide information on its expansion geometry. The data...
GRB 051028: an intrinsically faint GRB at high redshift? (2006)
Castro-Tirado, A. J., Jelinek, M., Pandey, S. B., McBreen, S., De Jong, J., Sahu, D. K., ...
We present multiwavelength observations of the gamma-ray burst GRB 051028 detected by HETE-2 in order to derive its afterglow emission parameters and to determine the reason for its optical faintness...
Multi-wavelength afterglow observations of the high redshift GRB 050730 (2006)
Pandey, S. B., Castro-Tirado, A. J., McBreen, S., Perez-Ramirez, M. D., Bremer, M., Guerrero, M. A., ...
GRB 050730 is a long duration high-redshift burst (z=3.967) discovered by Swift. The afterglow shows variability and is well monitored over a wide wavelength range. We present comprehensive temporal...
GRB 060121: Implications of a Short/Intermediate Duration Gamma-Ray Burst at High Redshift (2006)
Postigo, A. De Ugarte, Castro-Tirado, A. J., Guziy, S., Gorosabel, J., Johannesson, G., Aloy, M. A., ...
Since the discovery of the first short-hard gamma-ray burst afterglows in 2005, the handful of observed events have been found to be embedded in nearby (z < 1), bright underlying galaxies. We present...
Revealing the Jet Structure of GRB 030329 with High Resolution Multicolor Photometry (2006)
Gorosabel, J., Castro-Tirado, A. J., Ramirez-Ruiz, E., Granot, J., Caon, N., Cairos, L. M., ...
We present multicolor optical observations of the nearby (z=0.1685) GRB 030329 obtained with the same instrumentation over a time period of 6 hours for a total of an unprecedented 475...
GRB 060121: implications of a short-/intermediate-duration γ-ray burst at high redshift (2006)
Castro-Tirado, A. J., Guziy, S., Gorosabel, J., Johannesson, G., Aloy, M. A., ...
GRB 060121: implications of a short-/intermediate-duration γ-ray burst at high redshift (2006)
Castro-Tirado, A. J., Guziy, S., Gorosabel, J., Johannesson, G., Aloy, M. A., ...
Multi-wavelength afterglow observations of the high redshift GRB 050730 (2006)
Pandey, S. B., Castro-Tirado, A. J., McBreen, S., Pérez-Ramírez, M. D., Bremer, M., Guerrero, M. A., ...
GRB 051028: An intrinsically faint gamma-ray burst at high redshift? (2006)
Castro-Tirado, A. J., Jelínek, M., Pandey, S. B., McBreen, S., De Jong, J., Sahu, D. K., ...
GRB 051028: an intrinsically faint gamma-ray burst at high redshift? (2006)
Castro-Tirado, A. J., Jelínek, M., Pandey, S. B., McBreen, S., De Jong, J., Sahu, D. K., ...
Aims.We present multiwavelength observations of the gamma-ray burst GRB 051028 detected by HETE-2 in order to derive its afterglow emission parameters and to determine the reason for its optical...
Revealing the Jet Structure of GRB 030329 with High-Resolution Multicolor Photometry (2006)
Gorosabel, J., Castro-Tirado, A.J., Ramirez-Ruiz, E., Granot, J., Caon, N., Cairós, L.M., ...
We present multicolor optical observations of the nearby (z=0.1685) gamma-ray burst GRB 030329 obtained with the same instrumentation over a time period of 6 hours, for a total of an unprecedented...
A photometric redshift of z = 6.39 ¿ 0.12 for GRB 050904 (2006)
Haislip, J.B., Nysewander, M.C., Reichart, D.E., Levan, A.J., Tanvir, N., Cenko, S.B., ...
Gamma-ray bursts (GRBs) and their afterglows are the most brilliant transient events in the Universe. Both the bursts themselves and their afterglows have been predicted to be visible out to...
GRB 060121: a short-population burst at high redshift (2006)
Castro Tirado, A. J., Guziy, S., Gorosabel, J., Johannesson, G., Aloy, M. A., ...
The short-duration GRB 050724 host galaxy in the context of the long-duration GRB hosts (2005)
Gorosabel, J., Castro-Tirado, A. J., Guziy, S., Postigo, A. De Ugarte, Reverte, D., Antonelli, A., ...
We report optical and near-infrared broad band observations of the short-duration GRB 050724 host galaxy, used to construct its spectral energy distribution (SED). Unlike the hosts of long-duration...
Discovery and identification of the very high redshift afterglow of GRB 050904 (2005)
Haislip, J., Nysewander, M., Reichart, D., Levan, A., Tanvir, N., Cenko, S., ...
In 2000, Lamb and Reichart predicted that gamma-ray bursts (GRBs) and their afterglows occur in sufficient numbers and at sufficient brightnesses at very high redshifts (z > 5) to eventually replace...
Resmi, L, Chandra, Ishwara CH, Tirado, Castro AJ, Bhattacharya, D, Rao, AP, Bremer, M, ...
We present radio, millimeter and optical observations of the afterglow of GRB 030329. $UBVR_CI_C$ photometry is presented for a period of 3 h to 34 days after the burst. Radio monitoring at 1280 MHz...
Spectro-photometric study of the GRB 030329 host galaxy (2005)
Gorosabel, J., Perez-Ramirez, D., Sollerman, J., Postigo, A. De Ugarte, Fynbo, J. P. U., Castro-Tirado, A. J., ...
In this study optical/near-infrared(NIR) broad band photometry and optical spectroscopic observations of the GRB 030329 host galaxy are presented. The Spectral Energy Distribution (SED) of the host...
The GRB 030329 host: a blue low metallicity subluminous galaxy with intense star formation (2005)
Gorosabel, J., Pérez-Ramírez, D., Sollerman, J., Postigo, A. De Ugarte, Fynbo, J. P. U., Castro-Tirado, A. J., ...
We present broad band photometry and spectroscopic observations of the host galaxy of GRB 030329. Analysis of the spectral emission lines shows that the host is likely a low metallicity galaxy...
The search for the host galaxy of the gamma-ray burst GRB 000214 (2005)
Guziy, S., Gorosabel, J., Castro-Tirado, A. J., Postigo, A. De Ugarte, Jelínek, M., Ramírez, M. D. Pérez, ...
We present UBVRI-band observations taken ~300 days after the BeppoSAX gamma-ray burst GRB 000214. This GRB did not show a detectable optical afterglow, however due to the localization of a previously...
GRB 050509b: the elusive optical/nIR/mm afterglow of a short-duration GRB (2005)
Castro-Tirado, A. J., Postigo, A. De Ugarte, Gorosabel, J., Fatkhullin, T., Sokolov, V., Bremer, M., ...
We present multiwavelength (optical/near infrared/millimetre) observations of a short duration gamma-ray burst detected by Swift (GRB 050509b) collected between 0 seconds and ~18.8 days after the...
Resmi, L., Ishwara-Chandra, C. H., Castro-Tirado, A. J., Bhattacharya, D., Rao, A. P., Bremer, M., ...
We present radio, millimeter and optical observations of the afterglow of GRB030329. UBVR_{C}I_{C} photometry is presented for a period of 3 hours to 34 days after the burst. Radio monitoring at 1280...
The earliest spectroscopy of the GRB 030329 afterglow with 6-m telescope (2005)
Kurt, V. G., Sokolov, V. V., Fatkhullin, T. A., Komarova, V. N., Lebedev, V. S., Sokolova, T. N., ...
The earliest BTA (SAO RAS 6-m telescope) spectroscopic observations of the GRB 030329 optical transient (OT) are presented, which almost coincide in time with the "first break" ($t\sim 0.5$ day after...
The GRB 030328 host: another case of a blue starburst galaxy (2005)
Gorosabel, J., Jelinek, M., Postigo, A. De Ugarte, Guziy, S., Castro-Tirado, A. J.
We present for the first time the detection of the GRB 030328 host galaxy in four optical bands equivalent to UBRI. The host galaxy spectral energy distribution is consistent with a low extinction...
Resmi, L, Chandra, Ishwara CH, Tirado, Castro AJ, Bhattacharya, D, Rao, AP, Bremer, M, ...
We present radio, millimeter and optical observations of the afterglow of GRB 030329. $UBVR_CI_C$ photometry is presented for a period of 3 h to 34 days after the burst. Radio monitoring at 1280 MHz...
GRB 050904 at redshift 6.3: observations of the oldest cosmic explosion after the Big Bang (2005)
Tagliaferri, G., A. Antonelli, L., Chincarini, G., Fernández-Soto, A., Malesani, D., Valle Della, M., ...
We present optical and near-infrared observations of the afterglow of the gamma-ray burst GRB 050904. We derive a photometric redshift z = 6.3, estimated from the presence of the Lyman break falling...
GRB 050904 at redshift 6.3: observations of the oldest cosmic explosion after the Big Bang (2005)
Tagliaferri, G., A. Antonelli, L., Chincarini, G., Fernández-Soto, A., Malesani, D., Valle Della, M., ...
We present optical and near-infrared observations of the afterglow of the gamma-ray burst GRB 050904. We derive a photometric redshift z = 6.3, estimated from the presence of the Lyman break falling...
The search for the host galaxy of the gamma-ray burst GRB 000214 (2005)
Guziy, S., Gorosabel, J., Castro-Tirado, A.J., Postigo, A.D., Jelinek, M., Perez-Ramirez, M.D., ...
The GRB 030329 host: a blue low metallicity subluminous galaxy with intense star formation. (2005)
Gorosabel, J., Perez-Ramirez, D., Sollerman, J., Fynbo, J.P.U., Castro-Tirado, A.J., ...
Spectro-photometric study of the GRB 030329 host galaxy. (2005)
Gorosabel, J., Perez-Ramirez, D., Sollerman, J., Fynbo, J.P.U., Castro-Tirado, A.J., ...
The GRB-SN connection: GRB030329 and XRF030723 (2004)
Fynbo, J. P. U., Hjorth, J., Sollerman, J., Moller, P., Gorosabel, J., Guziy, S., ...
The attempt to secure conclusive, spectroscopic evidence for the GRB/SN connection has been a central theme in most GRB observing time proposals since the discovery of the very unusual GRB980425...
Earliest spectroscopy of the GRB030329 optical transient (2003)
Sokolov, V. V., Fatkhullin, T. A., Komarova, V. N., Kurt, V. G., Lebedev, V. S., Castro-Tirado, A. J., ...
We present the earliest BTA (SAO RAS 6-m telescope) spectroscopic observations of the GRB030329 optical transient (OT), which almost coincide in time with the first "break" (t ~ 0.5 day after the...
GRB 030227: the first multiwavelength afterglow of an INTEGRAL GRB (2003)
Castro-Tirado, A. J., Gorosabel, J., Guziy, S., Reverte, D., Cerón, J. M. Castro, Postigo, A. De Ugarte, ...
We present multiwavelength observations of a gamma-ray burst detected by INTEGRAL (GRB 030227) between 5.3 hours and ~1.7 days after the event. Here we report the discovery of a dim optical afterglow...
GRB 030227 : The first multiwavelength afterglow of an INTEGRAL GRB (2003)
Castro-Tirado, A. J., Gorosabel, J., Guziy, S., Reverte, D., Castro Cerón, J. M., ...
We present multiwavelength observations of a gamma-ray burst detected byINTEGRAL (GRB 030227) between 5.3 hours and ~ 1.7days after the event. Here we report the discovery of a dim opticalafterglow...
GRB 030227: The first multiwavelength afterglow of an INTEGRAL GRB (2003)
Castro-Tirado, A.J., Gorosabel, J., Guziy, S., Reverte, D., Castro Ceron, J.M., Ugarte Postigo, A. De, ...
We present multiwavelength observations of a gamma-ray burst detected by INTEGRAL (GRB 030227) between 5.3 hours and ~ 1.7 days after the event. Here we report the discovery of a dim optical...
GRB 030227 : The first multiwavelength afterglow of an INTEGRAL GRB (2003)
Castro-Tirado, A. J., Gorosabel, J., Guziy, S., Reverte, D., Castro Cerón, J. M., ...
The extraordinarily bright optical afterglow of GRB 991208 and its host galaxy (2001)
Castro-Tirado, A. J., Sokolov, V. V., Gorosabel, J., Cerón, J. M. Castro, Greiner, J., ...
Observations of the extraordinarily bright optical afterglow (OA) of GRB 991208 started 2.1 d after the event. The flux decay constant of the OA in the R-band is -2.30 +/- 0.07 up to 5 d, which is...
The extraordinarily bright optical afterglow of GRB 991208 and its host galaxy (2001)
Castro-Tirado, A.J., Sokolov, V., Gorosabel, J., Castro Ceron, J.M., Greiner, J., ...
Broad-band optical observations of the extraordinarily bright optical afterglow of the intense gamma-ray burst GRB 991208 started ~2.1 days after the event and continued until 4 Apr. 2000. The flux...
Detection of the near-infrared counterpart of GRB 971214 3.2 hours after the gamma-ray event (1998)
Gorosabel, J., Castro-Tirado, A. J., Willott, C. J., Hippelein, H., Greiner, J., Shlyapnikov, A., ...
We report the detection of the GRB 971214 counterpart in the near-infrared by means of two images in the K'-band taken at Calar Alto only ~3.5 and ~5 hours after the gamma-ray event. We detect the...