{
  "bibcode": "2006GCN..5080....1L",
  "body": "V. Lipunov, V.Kornilov, N.Tyurina, A.Belinski, D.Kuvshinov, E.Gorbovskoy,\nA.Krylov, N.Shatskiy, G.Borisov, A.Sankovich,  V.Vladimirov, P.Gritsyk, \nS.Korobkin\n\nSternberg Astronomical Institute, Moscow Union 'Optic'\n\nIn this circular we proposed and tested new method of optical observations \nof GRBs by wide field robotic telescopes: survey search of the optical \ntransient like supurnovae in large error box GRBs or dark not X-ray GRB.\nEspecially this method is very important for bright short GRB, that \nfrequently detected by all sky gamma-ray detectors (Konus-Wind, \nUlysses, Odyssey, etc) and for which connection with supernovae is not \nclear.\n\nThe difference between \"OT\" and \"SN\" is the following: OT - is the new \noptical object without known galaxy. The SN pipe line reduction is based \non the searching of the uncatalogized candidate near known galaxies (for \nexample from HyperLeda, http://www-obs.univ-lyon1.fr/hypercat/).\n\nMASTER  robotic system (http://observ.pereplet.ru, 6 square degrees field) \nobserved GRB060425 error box (GRB_TIME is 2006-04-25 16:57:40 UT, IPN \ntriangulation  GCN5005) in survey mode at considerable zenit distances. \nThe weather was good.\nWe have 4 nights (1-2 hours per night) observations:\n\n    Date    Days after GRB         Note                     Limit\n \t\tmean \n2006-04-26     1.1           (Lipunov et al.GCN5008)        17.5\n2006-04-27     2.1           (Lipunov et al.GCN5026)        17.5\n2006-04-30     5.2                                          17.8\n2006-05-03     8.1                                          17.6\n\nThe location of  our samples you can find at\nhttp://observ.pereplet.ru/images/GRB060425/GRB060425_ErrorBox_master.jpg\n\nThe unfiltered image is calibrated relative to USNO A2.0 (0.8 R + 0.2 B).\n\nThe robot not find OT brighter then 17.0 in\nlarge IPN error box (J. Cummings, S. Barthelmy et al. GCN5005).\n\nThe robot not find SN brighter then 17.5.\nFather observations of the GRB050425 not planed.\n\nMASTER team  thanks to Konus-Wind team for collaboration. This work is \nsupported by RFFI  04-02-16411 grant.\nThis message can be cited.\nMailto: lipunov@sai.msu.ru",
  "circularId": 5080,
  "createdOn": 1146924934000,
  "email": "gcncirc@observ.inetcomm.ru",
  "subject": "GRB060425: new MASTER survey method",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc@observ.inetcomm.ru>",
  "eventId": "GRB 060425"
}