{
  "bibcode": "2011GCN.11742....1V",
  "body": "A. Volnova (SAI MSU), A. Pozanenko (IKI),  I. Korobtsev (ISTP),  E. Klunko \n(ISTP) on behalf of larger GRB follow up collaboration report:\n\nWe observed the  Swift GRB 110213A (D'Elia et al., GCN 11705)  with AZT-33IK \ntelescope of Sayan observatory (Mondy) between Feb.13  (UT) 11:23 - 13:21 \n(Korobtsev et al.,  GCN 11713) and Feb. 15 (UT) 11:55 - 12:55. We took \nseveral series in both epochs in R filter. The optical afterglow (D'Elia et \nal., GCN 11705, Cenko GCN 11706, Rujopakarn et al., GCN 1707) is clearly \nvisible on single 60 s exposure images on Feb. 13, and  afterglow is visible \nin a stacked image on Feb. 15. During our observations within 2 hours on \nFeb. 13 (0.2555 - 0.3316 days after burst) the brightness of the afterglow \nwas not changing within error bars of about 0.06m. One can suggest that we \nobserved a plateau phase or a broad peak of the afterglow light curve. The \nafterglow is still bright (R ~ 20.45) at 2.297 days after burst.\n\nThe photometry based on the USNO-B1.0 star 1392-0070724 (J2000) RA=02 51 \n53.41, Dec= +49 16 02.9, assuming R=16.83:\n\nT0+       Filter,   Exposure, OT mag.,\n(mid, d)              (s)\n\n0.2555  R          4x60        17.61 +/- 0.06\n0.3260  R          4x60        17.76 +/- 0.07\n2.2973  R          3600        20.45 +/- 0.12\n\nThe photometry above is still preliminary.\n\n[GCN OPS NOTE(30apr11): Per author's request, Elunko was changed to Klunko.]",
  "circularId": 11742,
  "createdOn": 1297882813000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 110213A: optical observations in Mondy",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 110213A"
}