{
  "bibcode": "2020GCN.28550....1B",
  "body": "S. Belkin (IKI), I. Reva (FAPHI), A. Pozanenko (IKI)  report on behalf \nof GRB-IKI-FuN:\n\nWe observed the field of GRB 201001A (Simpson et al., GCN 28539) with \nZeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting \non Oct. 01 (UT) 22:56:08.\n\nNo optical source is detected within enhanced Swift-XRT position (Evans \net al., GCN 28540). This corresponds to the absence of the source in \nearlier optical observations (Simpson et al., GCN 28539;  Hosokawa et \nal., GCN 28548; Fu et al., GCN 28549).  Preliminary photometry of the \nfield is following.\n\nDate       UT start t-T0    Filter  Exp.  OT    Err. UL(3 sigma)\n                     (mid, days)     (s)\n\n2020-10-01 22:56:08 0.54732  R      22*50 n/d   n/d  20.3\n\nThe photometry is based on nearby USNO-B1.0 star.\n\nUSNO-B1.0_id R2\n0877-0204059 15.98",
  "circularId": 28550,
  "createdOn": 1601649568000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 201001A: TSHAO optical upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 201001A"
}