{
  "bibcode": "2020GCN.28151....1P",
  "body": "A. Pozanenko (IKI), S. Belkin (IKI),  V. Rumyantsev (CrAO), A. Gorshkov \n(INASAN), V. Kim (AFIF, Pulkovo Observatory),  N. Pankov (HSE), K. \nKamyshnikov (HSE),   M. Krugov (AFIF), A. Volnova (IKI), E. Mazaeva \n(IKI) report on behalf of larger GRB follow-up collaboration:\n\nWe observed GRB 200716C (Fermi GBM team, GCN 28123; Ukwatta et al GCN \n28124;  Torii et al., GCN 28139;  Xue et al., GCN 28145; Frederiks et \nal., GCN 28147)  with ZTSH 2.6m telescope of CrAO observatory, \nZeiss-2000 of Terskol observatory, and AZT-20 telescope of Assy-Turgen \nobservatory.   The optical afterglow (Ukwatta et al., GCN 28124; Lipunov \net al., GCN 28125; Hu et al., GCN 28126; Kumar et al., GCN 28138; \nGokuldass et al., GCN 28146; Jelinek et al., GCN 28149) and possible \nhost galaxy (D���Avanzo et al., GCN 28132)  is detected in a stacked \nimage. Preliminary photometry of the (afterglow + possible host galaxy) \nis following\n\nDate       UT start  t-T0    Filter Exp.   OT    Err. UL Telescope\n                     (mid, days)     (s)\n2020-07-17 19:17:52  0.84735 R      29*60  19.04 0.03 22.0 ZTSh\n2020-07-17 19:50:49  0.87023 R      30*60  19.21 0.03 21.9 ZTSh\n2020-07-18 18:33:32  1.83323 R      24*120 19.21 0.06 22.1 Zeiss-2000\n2020-07-18 19:25:19  1.85253 R      17*60  19.21 0.06 22.1 ZTSh\n2020-07-19 17:15:50  2.78066 r'     52*60  19.31 0.03 22.4 AZT-20\n\nThe photometry is based for R-calibration on the star\nUSNO-B1.0_id R\n1196-0207871 16.18\n\nand nearby SDSS stars for r' calibration\nSDSS-DR12_id        r\nJ130423.13+294053.3 15.970\nJ130352.15+293733.9 16.592\nJ130416.16+293906.8 16.914\n\nThe above photometry besides of the first observation   is consistent \nwith a brightness of possible host in USNO-B1.0 (R2=19.23) and in SDSS \nDR12 (r'= 19.301 +/- 0.026). We may conclude that we detected afterglow \nonly in the first observation on  0.84735 days after trigger at R=19.04 \n+/- 0.03.",
  "circularId": 28151,
  "createdOn": 1595345651000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 200716C: CrAO, Terskol, Assy-Turgen optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 200716C"
}