{
  "bibcode": "2021GCN.30230....1M",
  "body": "A. S. Moskvitin and O. A. Maslennikova (SAO RAS),\nreport on behalf of the GRB follow-up team.\n\nWe observed the field of the GRB 210610B (Page et al., GCN #30170)\nwith the SAO RAS 1-m telescope Zeiss-1000 + CCD-photometer in BVRc\nJohnson-Cousins filters on June 11 and 12.\n\nThe GRB OT is clearly detected in the stacked frames\nwith the following brightness.\n\nDate     UT_start  UT_end    Exp., s  T_mid-T0, d  R mag\nJune 11  18:54:36--20:03:45  4 x 300  0.98453      19.33 +/- 0.01\nJune 11  23:14:36--23:49:13  5 x 300  1.15309      19.62 +/- 0.02\nJune 12  21:28:37--22:47:50  6 x 300  2.09498      20.67 +/- 0.06\n\nThe preliminary photometry is based on the USNO-A2.0 star\nfrom GCN #30178 (Rumyantsev et al.) and previous GCN #30187.\nMagnitudes were not corrected for MW extinction.",
  "circularId": 30230,
  "createdOn": 1623596298000,
  "email": "mosk@sao.ru",
  "subject": "GRB 210610B: Further SAO RAS optical observations",
  "submitter": "Moskvitin Alexander at SAO RAS  <mosk@sao.ru>",
  "eventId": "GRB 210610B"
}