{
  "bibcode": "2010GCN.11200....1A",
  "body": "M. Andreev, A. Sergeev (Terskol Branch of Institute of Astronomy), \nA.Pozanenko (IKI), N. Parakhin, S. Velichko, N. Borachok (IC AMER)\nV. Petkov (Baksan Neutrino Observatory INR RAS) on behalf of larger GRB \nfollow up collaboration report:\n\nWe performed multicolor observations of the afterglow (Immler et al., GCN \n11159; Guidorzi et al., GCN 11160; Ivanov et al., GCN 11161; Klunko\net al., GCN 11162) of the Swift GRB 100901A (Immler  et al., GCN 11159) with \nthe Zeiss-2000 and  Meade-35 telescopes of Mt.Terskol of the first day after \nburst onset. The afterglow photometry is based on several  reference stars \nof SDSS DR7 and Lupton transformation ugri -> BV:\n\nT0+      Filter,            OT\n(d)\n\nTelescope: Meade-35\n0.3527  V               17.80+/-0.05\n\nTelescope: Zeiss-2000\n0.3704  B              18.11+/- 0.02\n0.4490  B              18.45+/- 0.02\n0.4579  V              18.06+/- 0.02\n0.4634  r(Gunn)      17.85+/- 0.02\n0.4714  g(Gunn)     18.37+/- 0.02\n\nThe photometry is still preliminary and can be updated later.",
  "circularId": 11200,
  "createdOn": 1283549778000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 100901A: multicolor photometry at Mt.Terskol",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 100901A"
}