{
  "bibcode": "2009GCN..9549....1G",
  "body": "A. Galeev, I. Bikmaev, N. Sakhibullin (KSU/AST),\nR. Burenin, M. Pavlinsky, R. Sunyaev (IKI),\nI. Khamitov, Z. Eker (TUG), U. Kiziloglu (METU),  E. Gogus (Sabanci Uni.)\n\nreport:\n\nWe observed the field of the Swift-BAT GRB 090621B (Curran et al., GCN9545)\nwith Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National\nObservatory, Turkey), starting at 21 Jun, 22:52:55 UT, i.e. approximately 45\nminutes after the burst, using TFOSC. \n\nWe made 3x300s exposures in Rc band. On combined image we do not detect any\nnew source inside the XRT error circle (Curran et al., GCN 9545) besides the\nsource reported by Levan et. al. (GCN 9547), which is detected only\nmarginally. There is also one more brighter point-like source\n(RA=20:53:51.25, DEC=+69:01:37.4, J2000) outside but close to the edge of\nXRT error circle. Using USNO-B1 stars we estimate its magnitude as\nm_Rc=21.8+/-0.06. The limiting magnitude of combined image is m_Rc ~23.6.\n\nThe finding chart can be found at:\n\nhttp://hea.iki.rssi.ru/grb/090621b/indexeng.html",
  "circularId": 9549,
  "createdOn": 1245664515000,
  "email": "rodion@hea.iki.rssi.ru",
  "subject": "GRB 090621B: RTT150 optical observations",
  "submitter": "Rodion Burenin at IKI, Moscow  <rodion@hea.iki.rssi.ru>",
  "eventId": "GRB 090621B"
}