{
  "bibcode": "2008GCN..7298....1P",
  "body": "D. A. Perley, M. Modjaz, J. S. Bloom, D. Poznanski, A. Miller, and D. \nKocevski (UC Berkeley) report:\n\nOn the night of 2008-02-12 (UT), we observed the field of GRB080210 \n(Grupe et al., GCN 7281) using Keck I (+LRIS) for 600s (R) and 900s (g). \n  We detect the GRB afterglow at the position noted by Klotz et al. (GCN \n7280) and Grupe et al.\n\nCalibrating relative to seven stars from the SDSS calibration table \ngiven in GCN 7282 (Cool et al.), we measure the following magnitudes (at \nUT = 15:32, 55.7 hours after the BAT trigger):\n\nR = 24.03 +/- 0.06\ng = 25.20 +/- 0.07\n\nThe quoted uncertainty is photometric only and does not include scatter \nin the field calibration relative to SDSS (which is significant.)\n\nCompared to the photometry given by Updike et al. (GCN 7288) this \nsuggests an unusually slow decay rate of alpha~0.85.  This may suggest \nthe presence of an underlying host galaxy, but the source appears \npointlike in our images and the redshift of z=2.1 (Jakobbson et al., GCN \n7286) would argue against a large host galaxy contribution.  The X-ray \nafterglow* also appears to be decaying slowly.\n\n---\n\n* http://astro.berkeley.edu/~nat/swift/00302888/bat_xrt.jpg.",
  "circularId": 7298,
  "createdOn": 1202861539000,
  "email": "dperley@astro.berkeley.edu",
  "subject": "GRB 080210: Keck photometry",
  "submitter": "Daniel Perley at U.C. Berkeley  <dperley@astro.berkeley.edu>",
  "eventId": "GRB 080210"
}