{
  "bibcode": "2019GCN.23601....1B",
  "body": "S. Belkin (IKI), E. Mazaeva (IKI),  A. Pozanenko (IKI),  P. Minaev \n(IKI), A. Volnova (IKI), N. Tominaga (Konan University), S. Blinnikov \n(ITEP), D. Chestnov (KIAM), E. Klunko (ISTP), I. Reva (FAPI), V. \nRumyantsev (CrAO),  D. Buckley (SAAO), R. Ya. Inasaridze (AbAO) report \non behalf of  GRB-FuN collaboration:\n\nWe observed  the   optical afterglow (e.g. Podesta et al., GCN  23470; \nKong  GCN 23475) of the INTEGRAL GRB 181201A  (Mereghetti et al., GCN \n23469)  with   Gemini-N telescope  on Dec. 22 in g'r'i'z and Dec. 24  in \nr'i'-filters.  Preliminary photometry of the OT is following.\n\nDate            t-T0  Filter Exp.   OT     Err.\n                 (mid, days)  (s)\n\n2018-12-22  21.10536 i'     3*180  21.50  0.03\n2018-12-22  21.09536 r'     3*180  21.82  0.03\n2018-12-24  23.09418 i'     3*180  21.32  0.06\n2018-12-24  23.10793 r'     3*240  21.83  0.03\n\nThe photometry is based on the SDSS-DR12 star\nSDSS-DR12_id           i'\tr'\nJ211710.81-123706.3    16.257\t16.517\n\nBased on our previous observations and photometry reported in GCNs \n23475, 23478,  23486, 23504 we plot a light curve of the afterglow in \nr'-filter (http://grb.rssi.ru/GRB181201A/GRB181201A_optics_fit.png). \nPower law approximation of the LC before 2018-12-22 has an index of \n1.19 +/-0.01. The photometry obtained on 2018-12-22 and 2018-12-24 has a \nsignificance of about 2 and 6.5 sigma above the power law approximation. \nAdditionally the i'-magnitude increases between  the two epochs. We can \nsuggest that we observed the Supernova signature associated with GRB \n181201A.",
  "circularId": 23601,
  "createdOn": 1546548028000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 181201A: photometric signature of the SN",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 181201A"
}