{
  "bibcode": "2020GCN.29181....1B",
  "body": "S. Belkin (IKI), A. Pozanenko (IKI), O. Burhonov (UBAI), R. Ya. \nInasaridze (AbAO), P. Levkina (INASAN), N. Pankov (HSE, IKI), A. Volnova \n(IKI), Sh. Ehgamberdiev (UBAI)  report on behalf of GRB IKI FuN:\n\nWe finished observations of the ZTF20acozryr/AT2020yxz (Coughlin et al., \nGCN  28841)  with AZT-22 telescope of Maidanak observatory, AS-32 \ntelescope of Abastumani observatory, and Zeiss-2000 telescope of Terskol \nobservatory.  The optical transient (Coughlin et al., GCN  28841; Xu  et \nal., GCN 28846; Zhu et al., GCN 28854; Mao et al., GCN  28861; Belkin et \nal., GCNs 28862, 28875, 28883, 28886;  Mao et al., GCN 28863; Kumar et \nal., GCN 28876; Paek  et al., GCN 28880; Moskvitin et al., GCN 28926) at \nredshift  z = 1.105 (Xu et al., GCN 28847) associated with afterglow of \nGRB 201103B (Ursi et al., GCN 28831; Svinkin et al., GCN 28844; Evans et \nal., GCN 28858).\n\nThe photometry reported early in Volnova  et al., GCN 28925 must \ncorrected the GCN 28886. We apologize for inconvenience and thank to \nD.A. Kann who pointed out for typo in the GCN 28925.\nWe repeat corrected photometry of our CrAO/ZTSh optical observation on \n2020-11-13 22:58:04 below. We also add photometry of positive detections \nand meaningful upper limit. the photometry below is still preliminary. \nThe photometry is based on the same reference stars of USNO-B1.0 stars.\n\nDate       UT start  t-T0     Filter Exp.  OT    Err.   UL. Telescope\n                      (mid, days)      (s)\n\n2020-11-12 20:20:48  9.12087    R  80*60   21.70 0.35   21.7 AS-32\n2020-11-13 22:58:04 10.21897    R  24*120  22.45 0.14   23.6 ZTSh\n2020-11-23 19:29:37 12.07213    R  14*180  22.80 0.13   24.1 AZT-22\n2020-11-23 19:26:37 20.08671    R  30*180  n/d   n/d    23.2 AZT-22\n\nA full light curve and upper limits obtained in our observations \n(R-filter) can be found in\n\nhttp://grb.rssi.ru/GRB201103B/GRB201103B_LC_R.png\n\nA typical power law  light curve (index of ~1.12) can be suggested based \non our observations and photometry gathered from  GCNs, see\n\nhttp://grb.rssi.ru/GRB201103B/GRB201103B_LC_GCN.png\n\nOne can suggest overlay bumps (or plateau) on  the light curve of at 2-3 \ndays, and 5-9 days after burst trigger.\n\nIf we extrapolate the power law curve backward to the 200 seconds the \nafterglow brightness could have ~12m. If so, one can look for data in \nall sky cameras or wide field surveys to search early phase of the \nafterglow of the GRB 201103B (trigger time (UT) 2020-11-03 18:06:45.36, \nUrsi et al., GCN 28831).",
  "circularId": 29181,
  "createdOn": 1609113921000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "ZTF20acozryr/AT2020yxz (GRB 201103B): Maidanak optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "ZTF20acozryr"
}