GRB 120602A

K. Hurley, and J. Goldsten, on behalf of the MESSENGER NS GRB team,

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

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

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

A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C.
Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,

and

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, report:

The  long-duration, very bright GRB 120602A was observed by INTEGRAL 
(SPI-ACS), Swift (BAT), Konus-Wind, Suzaku (WAM), MESSENGER (GRNS), and 
Mars Odyssey (HEND) on June 2 at about 18001 s UT (05:00:01). The burst 
was outside of the coded field of view of the BAT.

We have triangulated it to a 3 sigma error box whose
coordinates are:
---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
    87.922 (05h 51m 41s) -39.354 (-39d 21' 16")
  Corners:
    87.761 (05h 51m 03s) -39.306 (-39d 18' 22")
    87.798 (05h 51m 12s) -39.441 (-39d 26' 28")
    88.084 (05h 52m 20s) -39.402 (-39d 24' 08")
    88.046 (05h 52m 11s) -39.267 (-39d 16' 02")
  ---------------------------------------------
The error box area is 111 sq. arcmin, and its maximum
dimension is 16 arcmin.

This box may be further improved.

The time history and spectrum will be given in a forthcoming GCN Circular.

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 long intense GRB 120602A
(IPN localization: Hurley at al., GCN 13365
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triggered Konus-Wind at T0=18000.228s UT (05:00:00.228)

The light curve shows a bright pulse at ~T0+55 s,
preceded by several weaker overlapping pulses.
A total burst duration of the burst is ~70 s.
The emission is seen up to ~9 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB120602_T18000/

As observed by Konus-Wind the burst
had a fluence of (3.6 � 0.1)x10-4 erg/cm2,
and a 64-ms peak flux, measured from T0+54.912 s,
of (3.9 � 0.5)x10-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).

The time-integrated spectrum of the burst
(measured from T0 to T0+60.416 s)
is best fitted in the 20 keV - 10 MeV range
with the GRB (Band) model, for which:
the low-energy photon index alpha = -0.77 (-0.03, +0.03),
the high energy photon index beta = -2.8 (-0.1, +0.1),
the peak energy Ep = 300(-10, +10) keV,
chi2 = 104.3/80 dof.

The spectrum at the maximum count rate
(measured from T0+54.784s to T0+55.040 s) is best fitted
is best fitted in the 20 keV - 10 MeV range
with the GRB (Band) model, for which:
the low-energy photon index alpha = -0.85 (-0.10, +0.12),
the high energy photon index beta = -2.9 (<-2.5),
the peak energy Ep = 530(-90, +90) keV,
chi2 = 39.2/45 dof.

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

S. Kobayashi, M. Tashiro, Y. Terada, W. Iwakiri, T. Yasuda, K. Takahara,
M. Asahina, A. Sakamoto, H. Ueno (Saitama U.),
M. Akiyama, N. Ohmori,  M. Yamauchi (Univ. of Miyazaki),
K. Yamaoka, Y. E. Nakagawa (Waseda U.),
Y. Hanabata,  T. Kawano, K. Takaki, R. Nakamura, Y.Tanaka, M. Ohno,
Y. Fukazawa (Hiroshima U.), S. Sugita (Nagoya U.), M. Kokubun,
T. Takahashi (ISAS/JAXA), Y. Urata, P. Tsai (NCU), K. Nakazawa,
K. Makishima (Univ. of Tokyo), on behalf of the Suzaku WAM team, report:

The long GRB 120602A (IPN; Hurley and Goldsten et al., GCN 13365
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 , 
Konus-Wind; Golenetskii et al., GCN 13366
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triggered the Suzaku Wide-band  All-sky Monitor (WAM) which covers an 
energy range of 50 keV - 5 MeV at 05:00:0.83 UT (=T0).

The observed light curve shows a multi-peaked structure starting at 
T0+5.8 s, ending at T0+59.8 s,  with a duration (T90) of about 54 
seconds. The fluence in 100 - 1000 keV was
1.97 (-0.03, +0.07) x 10^-4 erg/cm^2. The 1-s peak flux measured from
T0+56.4s was 40.0 (+/-1.3) photons/cm^2/s in the same  energy range.

Preliminary result shows that the time-averaged spectrum from T0s to
T0+70s is well fitted by a power-law with exponential cutoff model:
   dN/dE ~  E^{-alpha} * exp(-(2-alpha)*E/Epeak) with
   alpha       1.49(-0.13, +0.12), and
   Epeak       305 (-51, +40) keV (chi^2/d.o.f. = 67.7/48).

All the quoted errors are at statistical 90% confidence level,
in which the systematic uncertainties are not included.

----
The light curves with 1-second time resolution for this burst are 
available at:

http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/untrig/grb_table.html