Gamma-ray Burst 110802A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN Circular #12247
  K. Hurley and J. Goldsten, on behalf of the MESSENGER GRNS team,
  I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team,
  W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team,
  S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team,
  K. Yamaoka, M. Ohno, Y. Hanabata, Y. Fukazawa, T. Takahashi, M. Tashiro, Y. Terada, T. Murakami, and K. Makishima on behalf of the Suzaku WAM team, and
  S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team, report:
  GRB 110802A, a short-duration, hard spectrum burst, was detected by Konus-Wind, MESSENGER GRNS, Odyssey HEND, Swift BAT (outside the coded field of view), and Suzaku WAM at 55157 s UT. We have triangulated it to a preliminary 3 sigma error box whose area is 55 sq. arcmin. and whose coordinates are

  CENTER:  RA=44.455 o =  02h57m49s , DEC= +32.593 o = 32 o 35' 34"
  CORNERS:    44.448 o=   02h57m48s        +32.932 o = 32 o 55' 54"
              44.476 o =  02h57m54s        +32.851 o = 32 o 51' 03"
              44.436 o =  02h57m45s        +32.329 o = 32 o 19' 45"
              44.465 o =  02h57m51s        +32.244 o = 32 o 14' 40"
  

  Some improvement to this error box is possible.
  A Swift ToO has been requested. The spectrum and time history will be reported in a forthcoming GCN Circular.
• GCN Circular #12249
  S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report:
  The short extremely hard GRB 110802A (localized by IPN: Hurley et al., GCN 12247) triggered Konus-Wind at T0=3D55156.191s UT (15:19:16.191)
  The burst light curve shows a single double-peaked pulse, the total duration of the burst is ~0.6 s. The emission is seen up to ~10 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB110802_T55156/
  As observed by Konus-Wind the burst had a fluence of (1.3 =B1 0.3)x10-5 erg/cm2, and a 16-ms peak flux, measured from T0-0.032 s, of (5.0 =B1 1.6)x10-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
  The spectrum of the burst (measured from T0 to T0+0.256 s) is best fitted in the 20 keV - 10 MeV range by a power law with exponential cutoff model, for which

  alpha =3D -0.63 (-0.25, +0.31),
  and Ep =3D 3451(-1086, +2256) keV,
  chi2 =3D 24.0/24 dof.
  

  All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.