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AuthorsA. Levan, A. Fruchter, J. Rhoads, B. Mobasher, N. Tanvir, J. Gorosabel, E. Rol, C. Kouveliotou, I. Dell'Antonio, M. Merrill, E. Bergeron, J.M. Castro Cerón, N. Masetti, P.M. Vreeswijk, A. Antonelli, D. Bersier, A. Castro-Tirado, J. Fynbo, P. Garnavich, S. Holland, J. Hjorth, P. Nugent, E. Pian, A. Smette, B. Thomsen, S.E. Thorsett, R.A.M.J. Wijers
TitleInfrared and optical observations of GRB 030115 and its extremely red host galaxy: Implications for dark bursts
JournalAstrophysical Journal
FacultyFaculty of Science
Institute/dept.FNWI: Astronomical Institute Anton Pannekoek (IAP)
AbstractWe present near-infrared (NIR) and optical observations of the afterglow of GRB 030115. Discovered in an infrared search at Kitt Peak 5 hr after the burst trigger, this afterglow is the faintest ever observed in the R band at such an early epoch and exhibits very red colors, with R - K approximate to 6. The optical magnitude of the afterglow of GRB 030115 is fainter than many upper limits for other bursts, suggesting that without early NIR observations it would have been classified as a "dark'' burst. Both the color and optical magnitude of the afterglow are likely due to dust extinction at moderate redshift z > 2 and indicate that at least some optical afterglows are very faint due to dust along the line of sight. Multicolor Hubble Space Telescope observations were also taken of the host galaxy and the surrounding field. Photometric redshifts imply that the host and a substantial number of faint galaxies in the field are at z similar to 2.5. The overdensity of galaxies is sufficiently great that GRB 030115 may have occurred in a rich high-redshift cluster. The host galaxy shows extremely red colors (R - K = 5) and is the first GRB host to be classified as an extremely red object (ERO). Some of the galaxies surrounding the host also show very red colors, while the majority of the cluster are much bluer, indicating ongoing unobscured star formation. As it is thought that much of high-redshift star formation occurs in highly obscured environments, it may well be that GRB 030115 represents a transition object, between the relatively unobscured afterglows seen to date and a population of objects that are very heavily extinguished, even in the NIR.
Document typeArticle
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