Sloan Digital Sky Survey Multicolor Observations of GRB010222
Abstract
The discovery of an optical counterpart to GRB010222 (detected by BeppoSAX; Piro 2001) was announced 4.4 hrs after the burst by Henden (2001a). The Sloan Digital Sky Survey's 0.5m photometric telescope (PT) and 2.5m survey telescope were used to observe the afterglow of GRB010222 starting 4.8 hours after the GRB. The 0.5m PT observed the afterglow in five, 300 sec g' band exposures over the course of half an hour, measuring a temporal decay rate in this short period of F_nu \propto t^{-1.0+/-0.5}. The 2.5m camera imaged the counterpart nearly simultaneously in five filters (u' g' r' i' z'), with r' = 18.74+/-0.02 at 12:10 UT. These multicolor observations, corrected for reddening and the afterglow's temporal decay, are well fit by the power-law F_nu \propto nu^{-0.90+/-0.03} with the exception of the u' band UV flux which is 20% below this slope. We examine possible interpretations of this spectral shape, including source extinction in a star forming region.
Cite
@article{arxiv.astro-ph/0104201,
title = {Sloan Digital Sky Survey Multicolor Observations of GRB010222},
author = {Brian C. Lee and Douglas L. Tucker and Daniel E. Vanden Berk and Brian Yanny and Daniel E. Reichart and Jennifer Adelman and Bing Chen and Mike Harvanek and Arne Henden and Zeljko Ivezic and Scot Kleinman and Don Lamb and Dan Long and Russet McMillan and Peter R. Newman and Atsuko Nitta and Povilas Palunas and Donald Schneider and Steph Snedden and Don York and John W. Briggs and J. Brinkmann and Istvan Csabai and Greg S. Hennessy and Stephen Kent and Robert Lupton and Heidi Jo Newberg and Chris Stoughton},
journal= {arXiv preprint arXiv:astro-ph/0104201},
year = {2009}
}
Comments
8 pages, 4 figures, accepted for publication in ApJ. Two figures added, minor changes to text in this draft. Related material can be found at: http://sdss.fnal.gov:8000/grb/