{
  "bibcode": "2010GCN.11177....1K",
  "body": "D. Kopac, B. Dintinjana and A. Gomboc (U. Ljubljana) report:\n\nWe observed the field of GRB 100901A (Immler et al., GCN 11159) with the\n0.7m Vega telescope located in Ljubljana, starting at 20:31:31 UT on 2010\nSeptember 01, approx. 7 hours after the trigger. We took 10 images in R\nband with exposure time 180s and we clearly detect the optical afterglow\n(Guidorzi et al., GCN 11160). Our preliminary photometry yields\n\nMid time from    Filter   Magnitude\ntrigger (days)\n-------------------------------------\n0.302            R        17.2 +- 0.1\n-------------------------------------\n\nMagnitude is calibrated against the USNO-B1.0 1127-0027192 reference star\n(R2=17.58) and is not corrected for Galactic extinction.",
  "circularId": 11177,
  "createdOn": 1283438447000,
  "email": "drejc.kopac@fmf.uni-lj.si",
  "subject": "GRB 100901A: Vega telescope optical afterglow observation",
  "submitter": "Drejc Kopac at Math Phys U,Slovenia  <drejc.kopac@fmf.uni-lj.si>",
  "eventId": "GRB 100901A"
}