{
  "bibcode": "2022GCN.31471....1P",
  "body": "N. Pankov (HSE), A. Pozanenko (IKI), A. Kusakin (FAP), I. Reva (FAP), R. \nYa. Inasaridze (AbAO), V. Agletdinov (KIAM), S. Belkin (IKI, HSE), I. \nSokolov (KIAM), M. Krugov (FAP) report on behalf of GRB IKI FuN:\n\nWe observed Swift GRB 220101A (Tohuvavohu, et al., GCN 31347) also\ndetected by Fermi/LAT (Arimoto et al. 2022, GCN 31350), AGILE (Ursi et\nal. 2022, GCN 31354),  Fermi/GBM (Lesage et al. 2022, GCN 31360), and \nKonus-Wind (Tsvetkova et al., GCN 31433)  with Zeiss-1000 telescope of \nTHSAO observatory (Kazakhstan) in R-filter starting on 2022-01-05 (UT) \n14:39:20. We were also observing the afterglow position with with AS-32 \ntelescope of Abastumani observatory (AbAO) and K-800 telescope of Mnt. \nTerskol observatory on 2022-01-06.\n\nThe afterglow (Tohuvavohu et al., GCN 31347; Kuin & Tohuvavohu, GCN \n31351; Fu et al., GCN 31353; Hentunen et al., GCN 31356; Perley et al., \nGCN 31357; de Ugarte Postigo et al., GCN 31358; Fynbo et al., GCN 31359; \nVinko et al., GCN 31361; Tomasella et al., GCN 31363; Mao et al., GCN \n31364; Noschese et al., GCN 31366; Mao et al., GCN 31368; Guelbenzu, et \nal., GCNs 31370, 31401; Strausbaugh et al., GCN 31371; D'Avanzo et al., \nGCN 31373; Strausbaugh et al., GCNs 31383, 31389; Dimple et al., GCN \n31384; Romanov, GCN 31387; Caballero-Garcia, GCN 31388; Belkin et al., \nGCNs 31390, 31398; Gupta et al., GCN 31394; D'Avanzo et al., GCN 31395; \nPankov et al., GCN 31398; Moskvitin et al., GCN 31420; Perley, GCN \n31425; Kumar et al., GCN 31442) is detected in THSAO observation, and \nupper limits obtained in Terskol K-800 and AbAO AS-32 observations.\nPreliminary photometry of the afterglow and upper limits is following\n\nDate UT start t-T0 Filter Exp. OT Err UL(3sigma) Telescope\n2022-01-05 14:39:20 4.42129 R     25*180 22.19 0.23  22.5 Zeiss-1000\n2022-01-06 15:06:30 5.45091 R    106*60  n/d   n/d   21.9 AS-32\n2022-01-06 17:21:42 5.51841 Clear 30*60  n/d   n/d   21.5 K-800\n\nThe photometry is based on the nearby SDSS-DR12 stars\nRA DEC R(Lupton transformations)\n00:05:20.64408 +31:45:46.0728 18.562\n00:05:34.81464 +31:45:50.5224 15.734\n00:05:32.53944 +31:44:51.9396 15.369\n00:05:36.69864 +31:44:42.4176 14.677\n\nBased on multiple observations cited above and our own observations the \nlight curve in R-filter  can be approximated by a single power law \n(after one day after the trigger) with the power law index of -1.9. The \nlight curve can be be found in\nhttp://grb.rssi.ru/GRB220101A/GRB220101A_LC.png",
  "circularId": 31471,
  "createdOn": 1642456947000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 220101A: TSHAO optical observation, Terskol, AbAO upper limits",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 220101A"
}