{
  "bibcode": "2018GCN.23302....1M",
  "body": "E. Mazaeva (IKI), A. Kusakin (FAPHI), A. Pozanenko (IKI), I. Reva \n(FAPHI),  A. Volnova (IKI), M. Krugov (FAPHI) report on behalf of larger \nGRB follow-up collaboration:\n\nWe observed the field of GRB 180930A (Tohuvavohu et al., GCN  23279) \nwith Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory \nstarting on September 30 (UT) 21:55:14, obtaining a total of 31*120 s \nexposure in the Rc-band. Within enhanced XRT position (Osborne et al., \nGCN 23282)  we do not detect any object. Preliminary photometry of the \nfield is following.\n\nDate       UT start t-T0    Filter Exp.   OT    Err. UL\n                     (mid, days) (s)\n\n2018-09-30 21:55:14 0.41030 R      31*120 n/d   n/d 20.1\n\nThe photometry is based on several nearby USNO-B1.0 stars.",
  "circularId": 23302,
  "createdOn": 1538586651000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 180930A: TSHAO optical upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 180930A"
}