{
  "bibcode": "2016GCN.19976....1P",
  "body": "R.Podesta, C.Lopez, F. Podesta\nObservatorio Astronomico Felix Aguilar (OAFA)\n\nH. Levato, C. Saffe\nInstituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)\n\nD.Buckley, S. Potter,\nSouth African Astronomical Observatory\n\nE.Gorbovskoy, V. Lipunov, N.Tyurina, V.Kornilov,\nO.Gress, P.Balanutsa, A.Kuznetsov, D.Kuvshinov\nLomonosov Moscow State University, Sternberg Astronomical Institute\n\nR. Rebolo, M. Serra Ricart, N. Lodieu, G. Israelian\nThe Instituto de Astrofisica de Canarias\n\nK.Ivanov, J.Rabinovich, N.M.Budnev,\nIrkutsk State University\n\nA. Tlatov, V.Senik, D. Dormidontov, A.Parkhomenko\nKislovodsk Solar Station of the Pulkovo Observatory\n\nV.Yurkov, Yu.Sergienko, A.Gabovich\nBlagoveschensk Educational State University, Blagoveschensk\n\nMASTER-OAFA  robotic telescope (MASTER-Net: http://observ.pereplet.ru) \nlocated in OAFA was pointed to the  GRB161001A 29 sec after notice \ntime and 41 sec after trigger time at 2016-10-01 01:05:57UT. On our \nfirst (10s exposure)  set we  not found OT within 6 square degrees \nfield around  SWIFT BAT  error-box (Page et al., GCN 19967; Markwardt et \nal.,GCN 19974 ) brighter then 16.7  unfiltered magnitude.\n\nMASTER-SAAO  robotic telescope (MASTER-Net: http://observ.pereplet.ru) \nlocated in SAAO was pointed to the  GRB161001A 167 sec after notice time \nand 176 sec after trigger time at 2016-10-01 01:08:17 UT. On our first \n(40s exposure)  set we haven`t found optical transient  within SWIFT \nerror-box.\n\nThe 5-sigma upper limit has been about 18.4 mag\n\nWe found optical object at first hour coadded images  by both MASTERs \ntelescopes at coordinates Ra 04:47:40.83 Dec -57:15:38.07 (+-0.7 arcsec \nerror) with unfiltered magnitude:\n\n0.8R +0.2B = 20.6 (+0.1 -0.4)\n\nwith respect to USNO B stars. We  have archival images in MASTER SAAO \nDataBase at 2016-04-09  with 20.9 3-SIGMA limit. We see same object at \nsame position.\n\nWe note that our scale is 1 pix ~ 2 arcsec . So the DSS2 object  (Kruehler \net al., GCN 19971)  and GROND afterglow candidate (Chen et al., GCN 19975) \nare inside the our pixel.\n\nThe message may be cited.",
  "circularId": 19976,
  "createdOn": 1475402913000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "GRB 161001A: MASTER-OAFA and MASTER-SAAO early optical observations",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>",
  "eventId": "GRB 161001A"
}