GRB 080513

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,

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

A. von Kienlin, G. Lichti, and A. Rau, on behalf of the
INTEGRAL SPI-ACS GRB team, report:

Mars Odyssey, Konus-Wind, Swift-BAT, and INTEGRAL-SPI-ACS
observed the long-duration bright GRB 080513 at about 18850 s UT 
(05:14:10). The burst was outside the coded field of view of the BAT. 
The burst light curve shows a multipeaked structure with a duration of 
~30 sec, followed by a weak pulse at ~T0+70 sec.

We have triangulated the burst to the following, preliminary 3-sigma
error box:
-----------------------------------------------
       RA(2000)                    Dec(2000)
-----------------------------------------------
Center:
  163.283 (10h 53m 08s)   +28.195 (+28d 11' 43")
Corners:
  163.291 (10h 53m 10s)   +28.731 (+28d 43' 51")
  163.334 (10h 53m 20s)   +27.777 (+27d 46' 36")
  163.268 (10h 53m 04s)   +27.646 (+27d 38' 47")
  163.227 (10h 52m 55s)   +28.606 (+28d 36' 21")
-------------------------------------------------

The error box area is 213 sq. arcmin and
the maximal distance between the box corners is 1.09 deg.
This error box may be improved.

Preliminary analysis of the Konus-Wind data yields
a burst fluence of ~2x10^-5 erg/cm2 (in the 20 keV - 2 MeV range),
and an Epeak of the time-integrated spectrum of ~200 keV.

Detailed spectral parameters will be reported later.

S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks,
and T. Cline on behalf of the Konus-Wind team report:

The long GRB 080513 localized by IPN (Golenetskii et al., GCN 7728
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triggered Konus-Wind at T0=18849.927 s UT (05:14:09.927).

As observed by Konus-Wind the burst
had a fluence of 2.02(-0.17, +0.20)x10^-5 erg/cm2,
and a 16-ms peak flux measured from T0+24.016 s
of (1.15 +/- 0.30)x10^-5 erg/cm2/s
(both in the 20 keV - 2 MeV energy range).

The time-integrated spectrum of the burst
(from T0 to T0+32.256 s) can be fitted (in the 20 keV-2 MeV range)
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with alpha = -1.48(-0.13, +0.12)
and Ep = 223(-38, +62) keV (chi2 = 76.6/61 dof).
Fitting by GRBM (Band) model yields the same alpha and Ep,
and only an upper limit on the high energy photon index: beta < -2.19
(chi2 = 76.0/60 dof).

The spectrum of the most intense part (from T0+16.640 to T0+24.064 s)
is well fitted (in the same range)
by a power law with exponential cutoff model
with alpha =  -1.31(-0.12, +0.11)
and Ep = 317(-50, +73) keV (chi2 = 56.7/61 dof).
Fitting by GRBM (Band) model yields the same alpha and Ep,
and only an upper limit on the high energy photon index: beta < -2.20
(chi2 = 56.5/60 dof).
The fluence of this part is (1.18 +/- 0.10)x10^-5 erg/cm2
(in the 20 keV - 2 MeV energy range).

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

The Konus-Wind light curve of this GRB is available
at http://www.ioffe.rssi.ru/LEA/GRBs/GRB080513_T18849/

[GCN OPS NOTE(15may08): Per author's request, "080515" in the first line
was chanegd to "080513".]