{
  "bibcode": "2015GCN.18613....1L",
  "body": "V. Lipunov, E.Gorbovskoy, N.Tyurina, V.Kornilov, P.Balanutsa,\nA.Kuznetsov, D. Vlasenko, D.Kuvshinov\nLomonosov Moscow State University, Sternberg Astronomical Institute\n\nR. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres\nThe Instituto de Astrofisica de Canarias\n\nA. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Senik\nKislovodsk Solar Station of the Pulkovo Observatory\n\nMASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) \nlocated in Kislovodsk was pointed to the  GRB151118.13 30 sec after notice \ntime and 44 sec after trigger time at 2015-11-18 03:07:17 UT. On our first \n(10s exposure)  set we haven`t found optical transient  within SWIFT \nerror-box (ra=03 48 37 dec=+65 52 06 r=0.05).\nThe 5-sigma upper limit has been about 16.5  mag unfiltered.\n\nMASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) \nlocated in IAC was pointed to the  GRB151118A  24 sec after notice time \nand 42 sec after trigger time at 2015-11-18 03:07:12 UT in two \npolarizations. On our first (10s exposure)  set we haven`t found optical \ntransient  within SWIFT error-box (Amaral-Rogers et al GCN 18611).\nOur early upper limits on single and coadd images given in a table below:\n\nTable 1.\n5 sigma limit.\n\nT-Ts  T-Tm  Expt.    P|     P-    coadd.\n                     lim     lim \n----------------------------------------\n   42    47    10    16.7   16.8     1\n   42    90    50    17.9   18.0     3\n   42   508   790    19.9   20.0    12\n   86    96    20    17.3   17.4     1\n  117   127    20    17.3   17.4     1\n  147   218   120    18.7   18.8     3\n  299   420   220    19.2   19.3     3\n  551   762   400    19.6   19.7     3\n---------------------------------------\n\n  T   - is a trigger time [s].\nTs   - image start time [s].\nTm   - image middle time [s].\nExpt - exposure time [s].\nP|   - image upper limit in polarizer orientated 90 deg. to RA axis [mag].\nP-   - image upper limit in polarizer orientated  0 deg. to RA axis [mag].\n\nWe do not see OT brighter 20 mag. There is marginal object (m~20) with 6\" \nW (RA) and 3\"S (dec)  offset from XRT error box center (Ra = 03h 48m \n40.40s Dec= 65d 54m 01.3s Mag ~ 20.3 +- 0.7  ).\n\nThe message may be cited.",
  "circularId": 18613,
  "createdOn": 1447845098000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "GRB GRB 151118A: MASTER-NET  optical observations",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>",
  "eventId": "GRB 151118A"
}