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Title: Infrared and Optical Observations of GRB 030115 and its ExtremelyRed Host Galaxy: Implications for Dark Bursts

Abstract

We present near-infrared (NIR) and optical observations ofthe afterglow of GRB 030115. Discovered in aninfrared search at Kitt Peak5 hr after the burst trigger, this afterglow is the faintest everobserved in the R band at such an early epoch and exhibits very redcolors, with R-K~;6. The optical magnitude of the afterglow of GRB 030115is fainter than many upper limits for other bursts, suggesting thatwithout early NIR observations it would have been classified as a "dark"burst. Both the color and optical magnitude of the afterglow are likelydue to dust extinction atmoderate redshift z>2 and indicate that atleast some optical afterglows are very faint due to dust along the lineof sight.Multicolor Hubble Space Telescope observations were also takenof the host galaxy and the surrounding field. Photometric redshifts implythat the host and a substantial number of faint galaxies in the field areat z 2:5. The overdensity of galaxies is sufficiently great that GRB030115 may have occurred in a rich high-redshift cluster. The host galaxyshows extremely red colors (R-K = 5) and is the first GRB host to beclassified as an extremely red object (ERO). Some of the galaxiessurrounding the host also show very red colors, while the majority of theclusterare much bluer, indicatingmore » ongoing unobscured star formation. Asit is thought that much of high-redshift starformation occurs in highlyobscured environments, it may well be that GRB 030115 represents atransition object, between the relatively unobscured afterglows seen todate and a population of objects that are very heavily extinguished, evenin the NIR.« less

Authors:
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Publication Date:
Research Org.:
COLLABORATION - NASA
OSTI Identifier:
927327
Report Number(s):
LBNL-63092
Journal ID: ISSN 0004-637X; ASJOAB; R&D Project: KS0606; BnR: KA1401030; TRN: US0803180
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 647; Related Information: Journal Publication Date: 2006
Country of Publication:
United States
Language:
English
Subject:
72; AFTERGLOW; COLOR; DUSTS; GALAXIES; STARS; TELESCOPES; gamma-ray-bursts supernovae

Citation Formats

Levan, Andrew, Fruchter, Andrew, Rhoads, James, Mobasher, Bahram, Tanvir, Nial, Gorosabel, Javier, Rol, Evert, Kouveliotou, Chryssa, Dell'Antonio, Ian, Merrill, Michael, Bergeron, Eddie, Castro Ceron, JosMar a, Masetti, Nicola, Vreeswijk, Paul, Antonelli, Angelo, Bersier,David, Castro-Tirado, Alberto, Fynbo, Johan, Garnavich, Peter, Holland,Stephen, Hjorth, Jens, Nugent, Peter, Pian, Elena, Smette, Alain, Thomsen, Bjarne, Thorsett, Stephen E., and Wijers, Ralph. Infrared and Optical Observations of GRB 030115 and its ExtremelyRed Host Galaxy: Implications for Dark Bursts. United States: N. p., 2006. Web. doi:10.1086/503595.
Levan, Andrew, Fruchter, Andrew, Rhoads, James, Mobasher, Bahram, Tanvir, Nial, Gorosabel, Javier, Rol, Evert, Kouveliotou, Chryssa, Dell'Antonio, Ian, Merrill, Michael, Bergeron, Eddie, Castro Ceron, JosMar a, Masetti, Nicola, Vreeswijk, Paul, Antonelli, Angelo, Bersier,David, Castro-Tirado, Alberto, Fynbo, Johan, Garnavich, Peter, Holland,Stephen, Hjorth, Jens, Nugent, Peter, Pian, Elena, Smette, Alain, Thomsen, Bjarne, Thorsett, Stephen E., & Wijers, Ralph. Infrared and Optical Observations of GRB 030115 and its ExtremelyRed Host Galaxy: Implications for Dark Bursts. United States. doi:10.1086/503595.
Levan, Andrew, Fruchter, Andrew, Rhoads, James, Mobasher, Bahram, Tanvir, Nial, Gorosabel, Javier, Rol, Evert, Kouveliotou, Chryssa, Dell'Antonio, Ian, Merrill, Michael, Bergeron, Eddie, Castro Ceron, JosMar a, Masetti, Nicola, Vreeswijk, Paul, Antonelli, Angelo, Bersier,David, Castro-Tirado, Alberto, Fynbo, Johan, Garnavich, Peter, Holland,Stephen, Hjorth, Jens, Nugent, Peter, Pian, Elena, Smette, Alain, Thomsen, Bjarne, Thorsett, Stephen E., and Wijers, Ralph. Mon . "Infrared and Optical Observations of GRB 030115 and its ExtremelyRed Host Galaxy: Implications for Dark Bursts". United States. doi:10.1086/503595.
@article{osti_927327,
title = {Infrared and Optical Observations of GRB 030115 and its ExtremelyRed Host Galaxy: Implications for Dark Bursts},
author = {Levan, Andrew and Fruchter, Andrew and Rhoads, James and Mobasher, Bahram and Tanvir, Nial and Gorosabel, Javier and Rol, Evert and Kouveliotou, Chryssa and Dell'Antonio, Ian and Merrill, Michael and Bergeron, Eddie and Castro Ceron, JosMar a and Masetti, Nicola and Vreeswijk, Paul and Antonelli, Angelo and Bersier,David and Castro-Tirado, Alberto and Fynbo, Johan and Garnavich, Peter and Holland,Stephen and Hjorth, Jens and Nugent, Peter and Pian, Elena and Smette, Alain and Thomsen, Bjarne and Thorsett, Stephen E. and Wijers, Ralph},
abstractNote = {We present near-infrared (NIR) and optical observations ofthe afterglow of GRB 030115. Discovered in aninfrared search at Kitt Peak5 hr after the burst trigger, this afterglow is the faintest everobserved in the R band at such an early epoch and exhibits very redcolors, with R-K~;6. The optical magnitude of the afterglow of GRB 030115is fainter than many upper limits for other bursts, suggesting thatwithout early NIR observations it would have been classified as a "dark"burst. Both the color and optical magnitude of the afterglow are likelydue to dust extinction atmoderate redshift z>2 and indicate that atleast some optical afterglows are very faint due to dust along the lineof sight.Multicolor Hubble Space Telescope observations were also takenof the host galaxy and the surrounding field. Photometric redshifts implythat the host and a substantial number of faint galaxies in the field areat z 2:5. The overdensity of galaxies is sufficiently great that GRB030115 may have occurred in a rich high-redshift cluster. The host galaxyshows extremely red colors (R-K = 5) and is the first GRB host to beclassified as an extremely red object (ERO). Some of the galaxiessurrounding the host also show very red colors, while the majority of theclusterare much bluer, indicating ongoing unobscured star formation. Asit is thought that much of high-redshift starformation occurs in highlyobscured environments, it may well be that GRB 030115 represents atransition object, between the relatively unobscured afterglows seen todate and a population of objects that are very heavily extinguished, evenin the NIR.},
doi = {10.1086/503595},
journal = {Astrophysical Journal},
number = ,
volume = 647,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2006},
month = {Mon May 01 00:00:00 EDT 2006}
}