{
  "bibcode": "2010GCN.10783....1R",
  "body": "V. Rumyantsev (CrAO), A. Pozanenko (IKI)  report on behalf of  larger GRB \nfollow-up collaboration:\n\nWe observed the field of the Swift GRB 100418A (Marshall  et al. GCN 10612) \nwith Shajn telescope of  CrAO between (UT) May, 14  21:07 -- 22:48 under \nphotometric weather conditions and mean seeing of about 2 arcsec.\nThe preliminary photometry of the afterglow+host in a stacked image based on \nUSNO-B1.0 star 1014-0271368  (RA(J2000) = 17:05:26.42 Dec(J2000)= \n+11:27:32.9)  assuming  R=17.32  is following:\n\nT0+      Filter,   Exposure,  mag.\n(mid, d)              (s)\n\n26.0332     R       90x60    21.86 +/-0.06\n\nThe photometry is compatible with R-magnitude reported by Perley et al, GCN \n10727 (R=21.85+/-0.05 at 17.739 days) and still brighter than assumed \nR-magnitude of the normal type of host galaxy (SDSS based ugriz-> R \nconversion) which cannot be explained solely by afterglow contribution \nfading steeper than power law with decay index of  .~0.8.",
  "circularId": 10783,
  "createdOn": 1274297113000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 100418A: CrAO optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 100418A"
}