{
  "bibcode": "2012GCN.13200....1V",
  "body": "A. Volnova (SAI MSU), E. Litvinenko (UBAI), I. Molotov (KIAM), A.\nPozanenko (IKI) on behalf of �larger GRB follow up collaboration\nreport:\n\nWe observed the field of the possible GRB 120402A (Swift\ntrigger=519207; Barthelmy et al., �GCN 13190) with ORI-40 telescope of\nKitab ISON observatory on Apr. 02 starting �(UT) 22:55:14, i.e. ~6 min\nafter burst trigger. We obtained several �unfiltered images with\nexposure of 60 seconds. Within BAT error circle of 3 arcmin, radius\n(Barthelmy et al., �GCN 13190) we do not detect apparently new source\nin comparison with DSS2-red. �The �photometry is based on �USNO-B1.0\nreference star 1092-0548647 �(20:57:27.42 +19:17:47.2) assuming R =\n14.41.\n\nTstart UT, � T0+, � � � �Filter, Exposure, OT, �UL (3 sigma)\n� � � � � � � �(mid, d) � � � � � � � (s)\n\n22:55:14 � �0.01449 � �none � 2800 � � �n/d � � 19.8",
  "circularId": 13200,
  "createdOn": 1333478929000,
  "email": "alinusss@gmail.com",
  "subject": "GRB 120402A: optical upper limit",
  "submitter": "Alina Volnova at SAI MSU  <alinusss@gmail.com>",
  "eventId": "GRB 120402A"
}