{
  "bibcode": "2017GCN.21208....1M",
  "body": "E. Mazaeva (IKI), A. Pozanenko (IKI), A. Kusakin (Fesenkov Astrophysical \nInstitute),  R. Inasaridze (AbAO), I. Reva (Fesenkov Astrophysical \nInstitute), A. Volnova (IKI),  V. Ayvazian  (AbAO),  O. Kvaratskhelia \n(AbAO), G. Inasaridze (AbAO), I. Molotov (KIAM) report on behalf of \nlarger GRB follow-up collaboration:\n\nWe observed the field of GRB 170519A (Ukwatta et al., GCN 21106) with \nZeiss-1000 1-m telescope of Tien Shan Astronomical Observatory\nstarting on May 20 (UT) 18:42:38. We took several images in R-filter\nwith exposures of 120 s during this night and 2 subsequent nights.\nThe optical afterglow (Ukwatta et al., GCN 21106; Izzo, et al.,\nGCN 21108) is visible in stacked images.\n\nWe also observed this field with AS-32 (0.7m) telescope of Abastumani\nObservatory on May 21 (UT) 17:22:33. We took several unfiltered frames\nwith 60 s exposure. In the enhanced XRT error circle (Beardmore et al.,\nGCN 21107) we do not detect the afterglow.\n\nPreliminary photometry of the afterglow is following:\n\nDate       UT start   t-T0    Filter Exp.   OT   Err. UL    Telescope\n                      (mid, days)     (s)              (3 sigma)\n\n2017-05-20 18:42:38  1.58414  R    24*120  20.06 0.06 21.4 Zeiss-1000\n2017-05-21 15:58:25  2.48340  R    39*120  20.95 0.14 21.6 Zeiss-1000\n2017-05-22 15:27:05  3.46168  R    39*120  22.20 0.40 21.9 Zeiss-1000\n2017-05-21 17:22:33  2.52050  CR   20*60   n/d   n/d  20.8 AS-32\n\nThe photometry is based on nearby SDSS stars, reported by\nMazaeva et al. (GCN 21169).\n\nThe  light curve of the GRB 170519A afterglow based on our observations \n  (GCNs 21162, 21169, 21206)  can be found at\nhttp://grb.rssi.ru/GRB170519A/GRB170519A_lc.png",
  "circularId": 21208,
  "createdOn": 1496691664000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 170519A: TShAO and AbAO optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 170519A"
}