{
  "bibcode": "2021GCN.30932....1P",
  "body": "N. Pankov (HSE),  A. Pozanenko (IKI), S. Belkin (IKI), E. Klunko (ISTP), \nV. Rumyantsev (CrAO), R. Ya. Inasaridze (AbAO) report  on behalf of GRB \nIKI FuN:\n\nWe observed the field of Swift/BAT trigger  1078701 (Bernardini  et al., \nGCN 30929) with AZT-33IK telescope of Sayan observatory (Mondy), ZTSh \ntelescope of CrAO, and AS-32 telescope of Abastumani observatory. The \nerror circle of BAT localization was fully covered in all our \nobservations.  In the first epoch of observations started on Oct. 10 \n(UT) 11:32:39 (about 50 minutes after trigger) within BAT localization \ncircle (Bernardini  et al., GCN 30929) we identified only one objects \nwhich is absent in  PS1 catalogue. The coordinates of the object are \n(J2000) 19:08:08.59  29:50:12.7 with uncertainty of 0.3 arcsec in both \ncoordinates.  The brightness of the object in R-filter in a stacked \nimage is R=21.13 +/- 0.19. The object is not present in following epochs \nof our observations.  Preliminary photometry of the object and upper \nlimits in stacked images are following\n\nDate       UT start  t-T0      Filter Exp.  OT    Err.  UL(3s) telescope\n                     (mid, days)        (s)\n2021-10-10 11:32:39  0.05560  R     30*120 21.13 0.19  21.9   AZT-33IK\n2021-10-10 15:42:40  0.20819  R     47*60  n/d   n/d   20.5   AS-32\n2021-10-10 16:24:24  0.23736  R     12*120 n/d   n/d   23.8   ZTSh\n2021-10-11 17:26:38  1.28057  R     15*120 n/d   n/d   23.6   ZTSh\n\n\nThe photometry is based on the nearby USNO-B1.0 stars\nUSNO-B1.0    R2\n1198-0327115 18.06\n1198-0327174 17.81\n\nThe power law index of light curve of the object between the detection \nepoch and deep non-detection is less than -1.7 and do not contradict the \ntypical light curve of GRBs. We could suggest the object as a \ncounterpart of of GRB which might have been registered by Swift as the \ntrigger 1078701.",
  "circularId": 30932,
  "createdOn": 1633991858000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "Swift Trigger 1078701: Mondy, CrAO, AbAO observations, possible optical counterpart",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>"
}