GRB 140619C

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, V. Pal'shin, D. Frederiks, D. Svinkin,
and T. Cline on behalf of the Konus-Wind 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 intense GRB 140619C has been observed by
Konus-Wind, MESSENGER (GRNS), Mars-Odyssey (HEND), INTEGRAL (SPI-ACS),
and Suzaku (WAM), so far, at about 81966 s UT (22:46:06).

We have triangulated it to a preliminary, 3 sigma error box whose 
coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   233.018 (15h 32m 04s) -25.599 (-25d 35' 55")
  Corners:
   233.298 (15h 33m 12s) -25.530 (-25d 31' 48")
   232.810 (15h 31m 14s) -26.672 (-26d 40' 18")
   232.738 (15h 30m 57s) -25.666 (-25d 39' 56")
   233.252 (15h 33m 00s) -24.382 (-24d 22' 57")
  ---------------------------------------------
The error box area is 0.549 sq. deg, and its maximum
dimension is 2.3 deg (the minimum one is 0.426 deg).

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB140619_T81966/IPN/

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

S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik,
M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lyssenko, and T. Cline
on behalf of the Konus-Wind team, report:

A long-duration, very intense GRB 140619C (IPN triangulation: Hurley et 
al., GCN 16427
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 ) triggered Konus-Wind at T0=81966.864 s UT (22:46:06.864).

The burst light curve shows two separate multipeaked episodes: the first
from ~T0-6 s to ~T0+12 s and the second longer and brighter
from ~T0+68 s to ~T0+93 s. The total duration of the burst is ~105 s.
The emission is seen up to ~10 MeV.

As observed by Konus-Wind, the burst had a fluence
of 1.1(-0.08,+0.08)x10^-4 erg/cm2, and a 64-ms peak flux,
measured from T0+72.832 s, of 2.25(-0.16,+0.16)x10^-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).

The time-averaged spectrum of the burst
(measured from T0 to T0+97.792 s)
is best fit in the 20 keV - 10 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -1.15 (-0.15,+0.19),
the high energy photon index beta = -2.37 (-0.13,+0.10),
the peak energy Ep = 129 (-12,+13) keV,
chi2 = 94/84 dof.

The spectrum near the peak count rate
(measured from T0+65.792 to T0+81.408 s)
is best fit in the 20 keV - 10 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -1.05 (-0.13,+0.13),
the high energy photon index beta = -2.37 (-0.14,+0.09),
the peak energy Ep = 169 (-15,+20) keV,
chi2 = 114/97 dof.

The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB140619_T81966/

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

[GCN OPS NOTE(21jun14) Added 140629C to the Subject line,
and changed 140616 to 140619 in the first sentence.]

V. Pal'shin reports on behalf of the Konus-Wind team:

The correct title of GCN 16429
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  should be
"Konus-Wind observation of GRB 140619C",
and the GRB name in the text should be also GRB 140619C (not GRB 140616C).

W. Iwakiri (RIKEN), M. Tashiro, Y. Terada, T. Yasuda, S. Koyama, S. Takeda,
T. Nagayoshi, J. Enomoto, S. Nakaya, T. Fujinuma, S. Matsuoka (Saitama U.),
M. Yamauchi, N. Ohmori, R. Kinoshita (Univ. of Miyazaki),
M. Ohno, T. Kawano, S. Furui, Y. Fukazawa (Hiroshima U.),
K. Yamaoka (Nagoya U.), S. Sugita (Ehime U.), Y. Hanabata (ICRR), 
Y. E. Nakagawa, M. Kokubun, T. Takahashi (ISAS/JAXA), Y. Urata (NCU), 
K. Nakazawa, K. Makishima (Univ. of Tokyo), 
on behalf of the Suzaku WAM team, report:

The bright GRB 140619C (localized by IPN: Hurley et al., GCN 16427
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 ;
Konus-Wind detection: Golenetskii et al., GCN 16429
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 ) triggered the Suzaku
Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV -
5 MeV at UT 22:46:01.623 (=T0).

The observed light curve shows a multi-peaked structure, consisting of
two separated episodes: the first one lasting from T0 to T0+6 s, and the
second brighter one lasting from T0+70 s to T0+94 s,  with a total 
duration (T90) of about 87 seconds. The fluence in 100 - 1000 keV was 
4.34 (+0.21, -0.23)x10^-5 erg/cm^2. The 1-s peak flux measured from 
T0+75 s was 8.32 (+1.12, -1.17) photons/cm^2/s in the same energy range.

Preliminary result shows that the time-averaged spectrum from T0 to
T0+92 s is well fitted by a single power-law with a photon index of 2.50
(+0.15, -0.14) (chi^2/d.o.f = 15.4/14).

All the quoted errors are at statistical 90% confidence level.
There might be some calibration uncertainties in spectral parameters
since the GRB photons came through the X-ray micro-calorimeter (XRS) dewar.

The light curves for this burst will be appeared at:
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html