{
  "bibcode": "2007GCN..6945....1K",
  "body": "E. Klunko, A. Marchenkov, M. Eselevich (ISTP),  A. Shulga, A. Volnova (SAI \nMSU),  A. Pozanenko (IKI)  on behalf of larger GRB follow up collaboration \nreport:\n\nWe observed the optical afterglow (Oksanen GCN 6873, Kann et al. GCN 6884) \nof  GRB071010b  (Markwardt  et al., GCN 6871) in R-band on Oct.12 ((UT) \n19:44:42 - 20:45:06) and Oct. 13 ((UT)19:17:13 - 20:14:49) with 1.5m \ntelescope of Sayan observatory. The optical afterglow is clearly visible in \nstacked images of  both epochs. Based on two USNO B1.0 stars  (Kann et. al \nGCN 6918) (RA (J2000) = 10:02:09.93, Dec. (J2000) = +45:41:18.4, R2=16.80; \nRA (J2000) = 10:02:23.11, Dec. (J2000) = +45:41:41.1, R2=16.94)  we \nestimated brightness of  the optical afterglow:\n\nT0+  ,        Exposure,   R_mag\n(mid time)\n\n1.9995 d   15x240 s     20.5 +/-0.1\n2.979 d     20x180 s     20.8 +/-0.2\n\nThe message may be cited.",
  "circularId": 6945,
  "createdOn": 1192822897000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB071010b: optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 071010B"
}