{
  "bibcode": "2009GCN..9833....1C",
  "body": "GRB 090820: RT-2 detection of a strong burst\n\n\nS. K. Chakrabarti, A. Nandi, D. Debnath, T. C. Kotoch (ICSP, Kolkata, \nIndia), A. R. Rao, J. P. Malkar, M. K. Hingar, V. K. Agrawal (TIFR, Mumbai, \nIndia),  T. R. Chidambaram, P. Vinod, S. Sreekumar (VSSC, \nThiruvananthapuram, India), Y. D. Kotov, A. S. Buslov, V. N. Yurov, V. G. \nTyshkevich, A. I. Arkhangelskij, R. A.Zyatkov (MephI, Moscow, Russia) report:\n\nThe RT-2 Experiment onboard the CORONAS-PHOTON satellite has detected GRB \n090820 (FERMI, Trigger No.- 272421498, V. Connaughton, GCN 9829) which \nis     triggered at T0 = 00h 38m 16s (UT) (Onboard processor switch/toggle \nto Flare mode from Quiet mode). The satellite was in the GOOD/LIGHT mode  \nwith Earth latitude = -64.09 and longitude = 169.11. with GOOD time \nobservation of 600 sec starting at 00h 29m 16sec (UT) and ending at 00h 39m \n16sec (UT). After 30 sec, the satellite completely entered into BAD mode of \nhigh charge particle region.\n\nThe GRB light curve shows a simple profile of a strong emission peak at \nT0+34 sec with a weak precursor (T0). The time duration of the brightest \nemission is around 19 sec with ~1100 cts/sec.\n \nBoth RT-2/S and RT-2/G detectors have registered this burst profile in the \nenergy band of 15 - 1000 keV with strongest emission in the energy range of \nabove 100 keV to 330 keV. It is also noted that the burst width decreases \nwith the increase in the energy band, a quite natural phenomena of GRB burst \nprofile. \n\nThis analysis is preliminary. Analysis of time resolved spectral data is \ngoing on, however\nthe light curve is available at the web-site: \nhttp://csp.res.in/rt2_files/grb090820-lc.html",
  "circularId": 9833,
  "createdOn": 1251095673000,
  "email": "chakraba@bose.res.in",
  "subject": "GRB 090820: detection of a strong burst by RT-2 on board CORONAS PHOTON",
  "submitter": "Sandip K. Chakrabarti at S.N. Bose Nat. Centre for Basic Sci.  <chakraba@bose.res.in>",
  "eventId": "GRB 090820"
}