{
  "bibcode": "2014GCN.15776....1P",
  "body": "V.A.Poleshchuk, O.Gres, K.Ivanov, S.Yazev, N.M.Budnev, O.Chuvalaev, \nIrkutsk State University\n\nD.Denisenko, E. Gorbovskoy, V. Lipunov, \nD.Kuvshinov,  N.Tyurina, N.Shatskiy, P.Balanutsa, \nA.Kuznetsov, V.Kornilov, V.V.Chazov\nLomonosov Moscow State University, Sternberg Astronomical Institute\n\nV.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov\nBlagoveschensk Educational State University, Blagoveschensk\n\nV.Krushinski, I.Zalozhnih,  A. Popov\nUral Federal University, Kourovka\n\nA. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik\nKislovodsk Solar Station of the Pulkovo Observatory\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\n\n   MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) \nlocated\nin Tunka was pointed to the  GRB140129B  78 sec after notice time and 105 \nsec after trigger time at 2014-01-29 12:52:54 UT (Bernardini et al., GCN \n15765).\nSuch a long pointing time is due to internal mount pointing error under \nstrong Siberian frost, which was automatically solved. A set of images \nwith increasing exposures was obtained with the field at zenith distance \n75 deg and setting. On our first (20s exposure) image we found optical \ntransient at the SWIFT optical transient position. \nThe unfiltered magnitude is about ~14m (Ivanov et al., GCN 15766).\n\n    Our coordinates measured from the combination of 7 images are \ncoincident with Swift UVOT position taking into account the error box \nreported by Bernardini et al., GCN 15765 and Swift-XRT position (Goad et \nal., GCN 15770):\n\n\n     R.A.        Dec.            Err\n21 47 01.71 +26 12 22.8     +/-0.5 arcsec\n\n    The object is visible on 6 images, gradually fading below the detection\nlimit on the 7th image. The results of our photometry are given in table \nbelow:\n\nT_start   T-T_trig Tm-T_trig   Exp,s Elevation  Mag\n----------------------------------------------------\n12:52:54   105        115       20     15.5     14.4\n12:54:03   174        189       30     15.3     15.4\n12:55:28   259        284       50     15.1     15.9\n12:57:15   366        401       70     14.9     16.2\n12:59:19   490        540      100     14.6     17.0\n13:02:11   662        727      130     14.2     17.3\n13:05:28   859        944      170     13.7     17.7\n13:09:21  1091       1181      180     12.7     18.0\n13:13:20  1330       1540      360     11.6    <18.4    # coadd 2 image\n\nIn the table above 'T' is time of exposure beginning, 'Tm' is mid-exposure \ntime.\nThe power law slope is alpha = 1.42.\n\nThe GRB140129B duration is small (T_90 < 2 sec, Palmer et al., GCN 15774), \nbut spectrum is soft and this burst must be  faint long GRB (Pal'shin, \nprivet communication; Palmer et al., GCN 15774).\n\nAnimation of seven frames by MASTER-Tunka is uploaded to\nhttp://master.sai.msu.ru/static/GRB/GRB140129B-MASTER-Tunka-anim.gif\n\nThe light curve is available here:\nhttp://master.sai.msu.ru/static/GRB/GRB140129B_last.png\n\nTake the opportunity we would like to congratulate our first author from \nSiberia Vladimir  Poleshchuk  with the birth of the grandchild.\n\nThe message  may be cited.",
  "circularId": 15776,
  "createdOn": 1391072094000,
  "email": "gcncirc@observ.inetcomm.ru",
  "subject": "GRB 140129B:  MASTER OT early light curve",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc@observ.inetcomm.ru>",
  "eventId": "GRB 140129B"
}