{
  "bibcode": "2009GCN..9665....1R",
  "body": "Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite\n\n\nA. R. Rao, J. P. Malkar, M. K. Hingar, V. K. Agrawal (TIFR, Mumbai, India), S. K. \nChakrabarti, A. Nandi, D. Debnath, T. C. Kotoch (ICSP, Kolkata, India), T. R.\nChidambaram, P. Vinod, S. Sreekumar (VSSC, Thiruvananthapuram, India), Y. D.\nKotov, A. S. Buslov, V. N. Yurov, V. G. Tyshkevich, A. I. Arkhangelskij, R. A.\nZyatkov (MephI, Moscow, Russia) report:\n\nThe RT-2 Experiment onboard the CORONAS-PHOTON satellite has clearly detected\nGRB 090618 (Schady et al., 2009, GCN 9512) which triggered at T0 = 30507.00\nsec (UT) (08h 28m 27s). The satellite was in the SHADOW mode (away from the\nSUN) with GOOD time (away from the polar and SAA regions) observation of 700\nsec starting at 08h 23m 27sec (UT) and ending at 08h 36m 46.99sec (UT).\n\nThe GRB light curve shows a complex profile (Golenetskii et al., 2009, GCN \n9553) of time duration of around 150 sec. The burst profile has three main \npulses with the brightest pulse (~700 cts/sec) started at T0+65 sec, the second \none at T0+85 sec and the last one at T0+115 sec.\n\nBoth RT-2/S and RT-2/G detectors have registered this multi-structured burst \nprofile of the light curve in the energy band of 60 - 215 keV. In high-energy \nband of 330 - 1000 keV, the profile becomes simple with a single bright peak at \nT0+65 sec. It is also noted that the burst width decreases with the increase in \nthe energy band, a quiet natural phenomena of GRB burst profile. The burst was \nincident at an angle of 77 degrees to the detector axis. It showed the typical \nBand spectrum with peak energy at about 180 keV and integrated 20 keV - 1MeV\nflux of 2.8 X 10^-4 ergs/ cm^2.\n \nThe light curve is available at the web-site:\nhttp://csp.res.in/rt2_files/grb090618-lc.html",
  "circularId": 9665,
  "createdOn": 1247646202000,
  "email": "chakraba@bose.res.in",
  "subject": "Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite",
  "submitter": "Sandip K. Chakrabarti at S.N. Bose Nat. Centre for Basic Sci.  <chakraba@bose.res.in>",
  "eventId": "GRB 090618"
}