{
  "bibcode": "2009GCN..9009....1H",
  "body": "K. Hurley and T. Cline, on behalf of the Mars Odyssey\nand Konus GRB teams,\n\nI. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin,\non behalf of the HEND-Odyssey GRB team,\n\nW. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on\nbehalf of the GRS-Odyssey GRB team,\n\nS. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, and D. Frederiks, \non behalf of the Konus-Wind team,\n\nK. Yamaoka, M. Ohno, Y. Fukazawa, T. Takahashi, M. Tashiro, Y. Terada,\nT. Murakami, and K. Makishima on behalf of the Suzaku WAM team,\n\nS. Barthelmy, J. Cummings, N. Gehrels, and H. Krimm, on behalf of\nthe Swift-BAT team,\n\nJ. Goldsten, on behalf of the MESSENGER NS GRB team, \n\nE. Costa, E. Del Monte, G. Di Cocco, I. Donnarumma, Y. Evangelista, M.\nFeroci, F. Fuschino, M. Galli, C. Labanti, I. Lapshov, F. Lazzarotto,\nM. Marisaldi, L. Pacciani, M. Rapisarda, and P. Soffitta,  on behalf of the\nAGILE MCAL and SuperAGILE teams, and\n\nC. Navia, on behalf of the Tupi collaboration, report:\n\nGRB090315 was observed by Odyssey (HEND and GRS), MESSENGER (GRNS),\nKonus-Wind, AGILE (MCAL and SuperAGILE, although the spacecraft was in\nthe SAA and the background was high; the event was outside the field of\nview of SuperAGILE), Suzaku (WAM), and Swift (BAT, but outside the\ncoded field of view) at 04:12:56 UT.  The burst had a fluence of\nseveral times 10^-5 erg cm^-2  and  a duration of about 9 s (detailed\nspectral information will be provided in a separate GCN Circular).  We\nhave triangulated it to the following preliminary, 3 sigma error box,\nwhose area is 0.8 sq. deg.\n\n-----------------------------------------------\n       RA(2000), deg            Dec(2000), deg\n-----------------------------------------------\nCenter:\n  142.641 (09h 30m 34s)   -27.556 (-27d 33' 21\")\nCorners:\n  140.759 (09h 23m 02s)   -26.958 (-26d 57' 28\")\n  140.936 (09h 23m 45s)   -27.257 (-27d 15' 25\")\n  144.531 (09h 38m 07s)   -28.062 (-28d 03' 43\")\n  144.339 (09h 37m 21s)   -27.782 (-27d 46' 57\")\n-----------------------------------------------\n\nThis error box may be improved.\n\nThe Tupi ground-based muon telescope (Augusto et al., Phys. Rev. D 77,\n123008, 2008) which was pointed in the direction of the burst\nregistered a significant increase in the count rate in a single 10 s\nlong bin which included the time of the burst, while a second telescope\nwhose field of view did not include the burst did not.  (The count\nrates and fields of view have been posted at\nssl.berkeley.edu/ipn3/090315).  The muon energy threshold is ~0.1 GeV,\ncorresponding to primary photons above 10 GeV.  Thus we believe that\nthe energy spectrum of this GRB extended at least into the multi-GeV\nenergy range.",
  "circularId": 9009,
  "createdOn": 1237420324000,
  "email": "khurley@ssl.berkeley.edu",
  "subject": "IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase",
  "submitter": "Kevin Hurley at UCBerkeley/SSL  <khurley@ssl.berkeley.edu>",
  "eventId": "GRB 090315"
}