{
  "bibcode": "2014GCN.16875....1G",
  "body": "E. Gorbovskoy, V. Lipunov, M.Pruzhinskaya,  V.Kornilov, D.Kuvshinov, N.Tyurina, \nP.Balanutsa, A.Kuznetsov, V.V.Chazov, D.Denisenko\nLomonosov Moscow State University,\nSternberg Astronomical Institute, Moscow State University\n\nA. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik\nKislovodsk Solar Station of the Pulkovo Observatory\n\nV.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov, A. Gabovich\nBlagoveschensk Educational State University, Blagoveschensk\n\nK.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk\nIrkutsk State University\n\nV.Krushinski, I.Zalozhnih,  A. Popov\nUral Federal University, Kourovka\n\nHugo Levato and Carlos Saffe\nInstituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)\n\nClaudio Mallamaci, Carlos Lopez and Federico Podest\nObservatorio Astronomico Felix Aguilar (OAFA)\n\n\nTwo MASTER II twin  robotic telescope (MASTER-Net: \nhttp://observ.pereplet.ru)  located in  Blagoveschensk  and Kislovodsk was \npointed to the  GRB140930B (Pasquale et. al GCN 16857) 21 and 36 sec after\nnotice time and  39 and 54 sec after trigger time respectively.\n\nSo we have 4 first images in four different polarization started after 21 \nsec (Blagoveschensk) and 36 sec (Kislovodsk) with 10 sec exposure.\nWe found 3-sigma OT    on one  tube image in Blagoveschensk at the\nWHT  position (Tanvir et. al, GCN16861, Fong et. al. GCN16863) with m = \n16+-0.5 mag. The OT seen at one first image only.\nThe image with OT is available at \nhttp://master.sai.msu.ru/static/GRB/GRB140930B_MASTER_OT.png\n\nWe do not see OT (Tanvir et. al GCN16857, Fong et. al. GCN16857) on three\ntube images on single and coadd images.\nThe analysis strongly is complicated by presence of very bright star (USNO \nB1 1142-0005722 ~14m) close to OT position. \nThe upper limits received by MASTER are given in the table below:\n\n\nt_start      | t-t_mid    | exptime | filt | lim  | site | coadd\n--------------------------+---------+------+------+------+-------\n19:42:21.909 | 44 sec     |      10 | P/   | 16.4 | A    |     1\n19:42:21.909 | 44 sec     |      10 | P\\   | 15.7 | A    |     1*\n19:42:36.837 | 59 sec     |      10 | P|   | 15.6 | K    |     1\n19:42:36.837 | 59 sec     |      10 | P-   | 16.0 | K    |     1\n19:42:21.909 | 70 sec     |      40 | P/   | 17.3 | A    |     3\n19:42:36.837 | 98 sec     |      50 | P-   | 16.9 | K    |     3\n19:42:21.909 | 130 sec    |     130 | P/   | 18.5 | A    |     6\n19:44:26.834 | 243 sec    |     120 | P-   | 18.0 | K    |     3\n19:42:36.837 | 188 sec    |     170 | P-   | 18.6 | K    |     6\n19:42:36.837 | 692 sec    |    1060 | P-   | 19.9 | K    |    13\n19:42:21.909 | 698 sec    |    1160 | P/   | 19.7 | A    |    14\n20:29:14.938 | 6120 sec   |    5400 | C    |~21.5 | K    |    30\n\n* possible OT\n\nC is  our white (clear) band which is well described by a parity 0.8R+0.2B (USNO B1).\n\nP/ and P\\ is a polarization filter which are oriented at an angle 45 and \n135 degrees to RA axis respectivel. P- and P| is a polarization filter \nwhich are oriented at an angle 0 and 90 degrees to RA axis respectivel.\n\nThis message may be cited.",
  "circularId": 16875,
  "createdOn": 1412232066000,
  "email": "gcncirc@observ.inetcomm.ru",
  "subject": "GRB 140930B: MASTER early possible OT detection",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc@observ.inetcomm.ru>",
  "eventId": "GRB 140930B"
}