{
  "bibcode": "2010GCN.10634....1R",
  "body": "V. Rumyantsev, D. Shakhovkoy (CrAO), A. Pozanenko (IKI)  report on behalf of \nlarger GRB  follow-up collaboration:\n\nWe observed the field of the Swift GRB 100418A (Marshall  et al. GCN 10612) \nwith AZT-11 telescope of CrAO between (UT) Apr. 19  01:26 -- 01:54 under \npoor seeing of about 4 arcsec. The optical afterglow (Marshall  et al. GCN \n10612, Filgas et al. GCN 10617) is clearly detected  in enhanced XRT error \ncircle (Osborne et al. GCN 10614). The coordinates of the afterglow are \n(J2000) RA= 17:05:27.08 Dec= +11:27:42.3\n\nThe photometry of the afterglow in a stacked image based on USNO-B1.0 star \n1014-0271368  (RA(J2000) = 17:05:26.42 Dec(J2000)= +11:27:32.9)  assuming \nR=17.32  is following:\n\nT0+      Filter,   Exposure, mag.\n(mid, d)              (s)\n\n0.1883     R       9x180    18.54 +/-0.03\n\nA finding char can be found at\nhttp://grb.rssi.ru/GRB100418A/GRB100418a_100418_R_azt11.gif",
  "circularId": 10634,
  "createdOn": 1271778958000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 100418A: optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 100418A"
}