{
  "bibcode": "2009GCN..9312....1R",
  "body": "V. Rumyantsev, K. Antoniuk (CrAO), A. Pozanenko (IKI) report on behalf of \nlarger GRB follow-up collaboration:\n\nWe observed the afterglow (Cummings et al. GCN 9254, Xin et al., GCN  9255) \nof  the Swift GRB 090426 (Swift trigger 350479, Cummings et al. GCN 9254) in \nR and B filters on Apr. 26  between (UT) 18:03:06 -- 19:47:38 with AZT-11 \ntelescope of CrAO.  We  detect the afterglow in  stacked image in R. \nAstrometry of the afterglow is RA(J2000):  12 36 18.10 Dec(J2000): +32 59 \n08.77  with uncertainty of 0.5 arcsec is  compatible with reported in GCN \n9265 (Oates et al).\n\nPreliminary photometry of combined images is based on  USNO-B1.0 \n1230-0248707  star  RA=12:36:18.03 Dec=+33:00:02.2   is  following:\n\nT0+     Filter, Exposure, mag.,     err.\n(d)             (s)\n\n0.2342  R 15x180   21.3 +/-0.2\n\n\nThe combined image can de found at\nhttp://grb.rssi.ru/GRB090426/GRB090426_AZT-11_R.gif\n\nTaking together early observations (Yoshida et al, GCN 9266, Kinugasa et al, \nGCN 9292, Mao et al, GCN 9285) with our photometry we estimate power law \ndecay index as ~0.9 which is compatible with decay index estimated by \nOlivares et al (GCN 9268).",
  "circularId": 9312,
  "createdOn": 1241134572000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 090426: optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 090426"
}