{
  "bibcode": "2012GCN.13636....1G",
  "body": "A. Galeev (Kazan Federal University), I. Khamitov (TUG),\nI. Bikmaev, N. Sakhibullin (Kazan Federal University),\nR. Burenin, M. Pavlinsky, R. Sunyaev (IKI),\nZ. Eker (TUG), U. Kiziloglu (METU),  E. Gogus (Sabanci Uni.)\n\nreport:\n\nWe continued the observations of the field of the Swift-BAT GRB\n120811C (Barlow et al. GCN 13622, Galeev et al., GCN 13626) with\nRussian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National\nObservatory, Turkey). The second epoch observations were started at \n12 Aug, 18:38 UT, i.e. approximately 27.05 hours after the burst. We made\na serie of 300s images in R using TFOSC instrument.\n\nThe afterglow was clearly detected in the combined image. Using\nUSNO-B1 stars as reference, we estimated the afterglow magnitude as\nm_R=22.3+-0.2.\n\nFitting this point together with the data from RTT150 first epoch\nobservations (Galeev et al., GCN 13626), gives the power law decay\nwith index alpha = 1.04 +- 0.05, consistent with late time decay in\nX-rays, as it was observed with XRT (Evans et al., GCN 13630).\n\nWhen all RTT150 data are compared with the data of MASTER telescopes\n(Denisenko et al., GCN 13623, Ivanov et al., 13635), the power law\nbreak at few hours time scale is found, approximately consistent with\nthe position of second break observed in X-rays with XRT (Evans et\nal., GCN 13630). However, better cross-calibration between RTT and\nMASTER photometry should be done for more reliable light curve\nmodelling.\n\nThe light curve and direct images of the field can be found at:\n\nhttp://hea.iki.rssi.ru/grb/120811c/indexeng.html",
  "circularId": 13636,
  "createdOn": 1344878970000,
  "email": "rodion@hea.iki.rssi.ru",
  "subject": "GRB 120811C: RTT150 optical observations",
  "submitter": "Rodion Burenin at IKI, Moscow  <rodion@hea.iki.rssi.ru>",
  "eventId": "GRB 120811C"
}