{
  "bibcode": "2008GCN..7890....1K",
  "body": "E. Klunko (ISTP), A. Pozanenko (IKI) on behalf of larger GRB follow up \ncollaboration  report:\n\nWe observed afterglow (Rujopakarn, et al., GCN 7792) of Swift GRB 0800603b \n(Mangano et al., GCN 7794)  with 1.5 m telescope of Sayan observatory \n(Mondy) on Jun.04 between (UT) 18:35 - 19:11. The afterglow is detected in a \ncombined image of 8x120 s exposure. A photometry of the afterglow obtained \nagainst several USNO-A2.0 stars is following:\n\nT0+       Exposure  R_mag\n(mid)\n\n0.9686 d  8x120 s   21.10 +/- 0.10\n\nThis photometry confirms the steep decay of a light curve (alpha ~ 2.5) \nsuggested by Kann et al. (GCN 7824).\nThe message may be cited.",
  "circularId": 7890,
  "createdOn": 1214048418000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 080603b: optical observation",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 080603B"
}