{
  "bibcode": "2009GCN..9656....1P",
  "body": "A. Pozanenko (IKI), A. Volnova (SAI MSU), V. Kouprianov, Ya. Naiden, V. \nSlesarenko, A. Devyatkin (Pulkovo Observatory),   report on behalf of larger \nGRB follow-up collaboration:\n\nWe observed   the field of the Swift GRB 090621B (Curran et al, GCN  9545) \nwith MTM-500 telescope of  Kislovodsk solar station of the Pulkovo \nobservatory  in two series in R-filter between (UT) 2009-06-21 22:31 - \n2009-06-22 00:01, i.e. starting ~24 minutes after burst onset.  The upper \nlimit of a stacked image of first 15 frames based on USNO B1.0 stars is \nfollowing\n\nT0+         Filter   Exp.      mag.\n(mid, d)                 s\n0.02147  R        15x60  >18.5 (3 sigma)\n\nWhile we do not detect  objects reported in GCN 9547 (Levan  et al.) and GCN \n9549 (Galeev et al.) in  the stacked image above, we may suggest a possible \nobject near the edge of  the refined XRT error box (Beardmore et al., GCN \n9550) in coordinates (J2000) RA  =  20:53:53.24 Dec = +69:01:45.5. This \npossible object appears more intense in the stacked image of the first five \nframes, and does not appear in the second epoch of our observations started \non Jun.21 (UT) 23:37. Due to low S/N ratio we cannot confirm the object is \nreal. We encourage re-analysis of  later deep observations to clarify the \nnature of the object.\n\nThe finding chart can be found at \nhttp://grb.rssi.ru/GRB090621B/grb090621B_MTM.png , where source labeled #5 \nis the USNO B1.0 star 1590-0172172  (RA(J2000)=20:53:57.28, \nDec(J2000)=+69:01:47.8, R2=19.41)",
  "circularId": 9656,
  "createdOn": 1247343583000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 090621B: MTM-500 optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 090621B"
}