{
  "bibcode": "2022GCN.31390....1B",
  "body": "S. Belkin (IKI, HSE), A. Pozanenko (IKI), E. Klunko (ISTP), N. Pankov \n(HSE)  report  on behalf of GRB IKI FuN:\n\nWe observed Swift GRB 220101A (Tohuvavohu, et al., GCN 31347) also \ndetected by Fermi/LAT (M. Arimoto et al. 2022, GCN 31350), AGILE (A. \nUrsi et al. 2022, GCN 31354), and Fermi/GBM (Lesage et al. 2022, GCN \n31360)  with AZT-33IK telescope of Sayan observatory (Mondy)  starting \non 2022-01-04  (UT) 15:16:32.  We detect the optical afterglow \n(Tohuvavohu et al., GCN 31347; Kuin & Tohuvavohu, GCN 31351; Fu et al., \nGCN 31353; Hentunen et al., GCN 31356; Perley et al., GCN 31357; de \nUgarte Postigo et al., GCN 31358; Fynbo et al., GCN 31359; Vinko et al., \nGCN 31361; Tomasella et al., GCN 31363; Mao et al., GCN 31364; Noschese \net al., GCN 31366; Mao et al., GCN 31368; Guelbenzu, et al., GCN 31370; \nStrausbaugh et al., GCN 31371, D'Avanzo et al., GCN 31373; Strausbaugh \net al., GCNs 31383, 31389; Dimple et al., GCN 31384; Romanov, GCN 31387; \nCaballero-Garcia, GCN 31388).    Preliminary photometry of the afterglow \nin a stacked image is following\n\nDate       UT start   t-T0       Filter Exp.   OT    Err.  UL(3sigma)\n                     (mid, days)        (s)\n\n2022-01-04 12:36:19   3.33083    R      30*120 21.50 0.12  23.1\n\n\nThe photometry is based on the nearby SDSS-DR12 stars\nRA DEC R(Lupton)\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\nWe searched for the nearest galaxy in catalogs. The nearest galaxy was \nfound in Legacy Survey 1.5 arcsec apart  from afterglow UVOT position \nwith r=23.98, z=21.33 and not detected in g-filter (Brick: 0013p317, \nObjid: 4276). The galaxy is not presented in SDSS and PS1 catalogs. This \nred galaxy might be a host galaxy of GRB 220101A, in this case the \ndistance from the source to the center of the galaxy will be about 10 \nkpc at redshift z = 4.618 (Fu et al., GCN 31353; Fynbo et al., GCN \n31359; Tomasella et al., GCN 31363).",
  "circularId": 31390,
  "createdOn": 1641387821000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 220101A: Mondy optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 220101A"
}