{
  "bibcode": "2013GCN.14321....1V",
  "body": "A.Volnova (SAI MSU/IKI), E. Klunko (ISTP), A. Pozanenko (IKI) report on \nbehalf of larger GRB follow-up collaboration:\n\nWe observed the field of the Swift GRB 130313A (Gompertz  et al., GCN \n14293) with AZT-33IK telescope of Sayan observatory (Mondy) on March 13 \nbetween (UT) 17:45:47 - 22:55:49. We took several images in R-filter of 90 s \nexposure which cover  partially the refined BAT error box (Barthelmy et al., \nGCN 14296).  Within  XRT position (Gompertz et al., GCN  14297; Osborne et \nal., GCN  14300) we do  not detect any source. Preliminary photometry of \ncombined images is following\n\nUT start,    t-t0           filter      Exp.   OT      UL (3 sigma)\n             (mid, days)                (s)\n\n17:54:56    0.06737        R          20x90   n/d     20.3\n17:54:56    0.17047        R        147x90   n/d     23.3\n\nThe photometry is based on two SDSS DR8  stars\nSDSS J154537.18-001931.3 RA = 15 45 37.18 Dec = -00 19 31.3 (J2000), R = \n18.95\nSDSS J154535.15-001918.8 RA = 15 45 35.15 Dec = -00 19 18.8 (J2000), R = \n16.76",
  "circularId": 14321,
  "createdOn": 1363463668000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 130313A: optical upper limit in Mondy observatory",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 130313A"
}