{
  "bibcode": "2009GCN..9539....1R",
  "body": "V. Rumyantsev (CrAO), A. Pozanenko (IKI)  report on behalf of larger GRB \nfollow-up collaboration:\n\nWe observed the afterglow (Schady  et al., GCN 9512; Cenko et al., GCN 9513; \nPerley, GCN 9514; Rujopakarn et al., GCN 9515) of  the Swift GRB 090618 \nbetween  (UT) Jun. 18  19:51 -  Jun. 19 00:51 with Shajn telescope of  CrAO. \nWe detect afterglow in every  BVRI of 60 s exposure images of the series. \nCoordinates of the afterglow are RA(J2000):  19 35 58.77 Dec(J2000): +78 21 \n24.2 with uncertainties of  0.3 arcsec.\n\nPreliminary photometry of selected images based on USNO-B1.0 star \n1683-0077955  (RA=19 36 36.34   Dec=+78 21 07.00) assuming R=16.57  is \nfollowing:\n\nT0+     Filter, Exposure, mag.,     err.\n(d)             (s)\n\n0.4763   R       60     18.60 +/-0.05\n0.5680   R       60     18.87 +/-0.03\n0.6496   R       60     19.17 +/-0.04\n0.6796   R       60     19.19 +/-0.10\n\nThe power low index of light curve approximation between 0.48 - 0.65 days \nis ~ -1.6, while after  0.65 days after burst onset we observe flattening of \nthe light curve. A finding chart can be found at \nhttp://grb.rssi.ru/GRB090618/GRB090618_090618_R_ZTSh.gif",
  "circularId": 9539,
  "createdOn": 1245546066000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 090618: ZTSh optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 090618"
}