{
  "bibcode": "2010GCN.10693....1R",
  "body": "V. Rumyantsev, D. Shakhovskoy (CrAO), A. Volnova (SAI MSU), A.\nPozanenko (IKI)  report on behalf of larger GRB  follow-up\ncollaboration:\n\nWe observed the field of the Swift GRB 100424A (Hoversten et al., GCN\n10667) with AZT-11 telescope of CrAO observatory between (UT) Apr. 24\n18:01 - 19:18 under seeing of about 3 arcsec. We detected a  probable\nsource at coordinates (J2000) RA =  13:57:47.64 Dec = +01:32:21.06\nwith an uncertainty of 0.5 arcsec in both coordinates. The probable\nsource is located 2.8 arcsec from the enhanced XRT position with an\nuncertainty (radius) of 1.7 arcsec (Evans et al., GCN 10669). Due to\nlow S/N we cannot confirm the detected source is a real object.\n\nWe do not detect any source at the position of afterglow candidate\n(Cenko, et al., GCN 10682, Cenko, et al., GCN 10690).\n\nThe photometry of the probable source and upper limit of the\npoint-like source in a stacked image based on USNO-B1.0 star\n(RA(J2000) = 13:57:45.54 Dec(J2000)= +01:33:29.7) and assuming R=17.80\nis following:\n\nT0+      Filter, Exposure, mag.           UL\n(mid, d)         (s)\n\n0.0882   R       21x180    20.1 +/- 0.3   20.4\n\nThe combined image can be found at\nhttp://grb.rssi.ru/GRB100424A/GRB100424a_R_AZT11.gif",
  "circularId": 10693,
  "createdOn": 1272354873000,
  "email": "alinusss@gmail.com",
  "subject": "GRB 100424A: CrAO optical observations",
  "submitter": "Alina Volnova at SAI MSU  <alinusss@gmail.com>",
  "eventId": "GRB 100424A"
}