{
  "subject": "GRB 100906A: optical observations at Mt.Terskol",
  "eventId": "GRB 100906A",
  "bibcode": "2010GCN.11267....1A",
  "createdOn": 1284086671000,
  "circularId": 11267,
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "email": "apozanen@iki.rssi.ru",
  "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 observed the field of Swift GRB 100906A (Markwardt  et al., GCN 11227) \nwith Zeiss-2000 telescope of Mt.Terskol observatory starting Sep. 06 (UT) \n23:56. We obtained images in g,V, r filters. The afterglow (Markwardt et al. \nGCN 11227, Ivanov et al. GCN 11228, Melandri et al. GCN 11229)  is clealy \ndetected in all filters. The preliminary photometry is based on GSC2.3 \ncatalog and Jordi et al. (2006) UBVRcIc -> ugriz transformations:\n\nT0+      Filter,     Exp.       OT\n(d)\n\n0.4213   r            6x120   19.43 +/-0.03\n0.4626   g         10x120    20.11 +/-0.02\n0.4785   V          7x120    19.77 +/-0.03"
}