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GCN Circular 7256

IPN localization of very hard GRB 080204
2008-02-05T17:57:16Z (16 years ago)
Valentin Pal'shin at Ioffe Inst <>
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks
on behalf of the Konus-Wind team,

K. Hurley and T. Cline on behalf of the Mars Odyssey, Konus,
and MESSENGER GRB teams,

W. Boynton, C. Fellows, K. Harshman, C. Shinohara and R. Starr, on
behalf of the GRS-Odyssey GRB team,

I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin,
on behalf of the HEND-Odyssey GRB team,

K. Yamaoka, M. Ohno, Y. Fukazawa, T. Takahashi, M. Tashiro, Y. Terada,
T. Murakami, and K. Makishima on behalf of the Suzaku WAM team,

A. von Kienlin, G. Lichti, and A. Rau, on behalf of the

M. Marisaldi, F. Fuschino, M. Galli, C. Labanti,
E. Del Monte, F. Lazzarotto, L. Pacciani, P. Soffitta
on behalf of the AGILE team, and

J. Cummings, S. Barthelmy, N. Gehrels, and H. Krimm, on behalf of
the Swift-BAT team, report:

Mars Odyssey (GRS), Konus-Wind, Suzaku-WAM, INTEGRAL SPI-ACS,
AGILE-MCAL, SuperAGILE, and Swift-BAT observed the long-duration, hard 
spectrum GRB 080204 at about 50192 s UT (13:56:32). The burst was 
outside the coded field of view of the BAT and SuperAGILE.
The burst light curve shows a short precursor, followed in ~3 sec by a 
single multipeaked pulse with a duration of ~15 sec. There is a sign of 
extended emission seen up to T-T0~80 s in the Konus-Wind soft band.

We have triangulated the burst to the following, preliminary 3-sigma
error box:
    RA(2000), deg             Dec(2000), deg
  285.566 (19h 02m 16s)   -62.896 (-62d 53' 44")
  287.728 (19h 10m 55s)   -62.334 (-62d 20' 01")
  283.813 (18h 55m 15s)   -63.453 (-63d 27' 12")
  283.277 (18h 53m 07s)   -63.402 (-63d 24' 08")
  287.212 (19h 08m 51s)   -62.305 (-62d 18' 18")

The error box area is 1212 sq. arcmin.
This error box may be improved

Preliminary analysis of the Konus-Wind data yields
a burst fluence of ~4x10^-5 erg/cm2 (in the 20 keV - 4 MeV range),
and a very hard energy spectrum with an Epeak of the main pulse
of ~1.4 MeV.

Detailed spectral parameters will be reported later.
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