GRB 130628A

D. Byrne (UCD), C. Meegan (UAH) and M. Burgess (UAH) report on behalf
of the Fermi GBM Team:

"At 12:44:02.12  UT on 28 June 2013, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 130628A (trigger 394116245/130628531)

High peak flux from the GRB caused GBM to issue a repoint request
that reoriented the satellite to place the GRB near the LAT boresight
for 2.5 hours, subject to Earth limb contraints.

The on-ground calculated location, using the GBM trigger
data, is RA = 6.29, DEC = -5.07 (J2000 degrees,
equivalent to 00 h 25m, -5 d 0'), with an uncertainty
of 1.71 degrees (radius, 1-sigma containment,
statistical only; there is additionally a systematic
error which is currently estimated to be 2 to 3 degrees).
The angle from the Fermi LAT boresight is 67 degrees.

The GBM light curve consists of two pulses
with a duration (T90) of about 22 s (50-300 keV).
The time-averaged spectrum from T0-3.1 s to T0+25.6 s is
well fit by a power law function with an exponential
high-energy cutoff. The power law index is -1.51 +/- 0.04 and
the cutoff energy, parameterized as Epeak, is 128 +/- 11 keV.

The event fluence (10-1000 keV) in this time interval is
(9.9 +/- 0.3)E-6 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+2.8 s in the 10-1000 keV band
is 14.5 +/- 0.3 ph/s/cm^2.

The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."



-- 
David Byrne BSc.
School of Physics,
Science Center North,
University College Dublin,
Belfield, Dublin 4,
Ireland.

Y. Ishida, M. Tashiro, Y. Terada, T. Yasuda, H. Ueno,
S. Sugimoto (Saitama U.), M. Ohno, K. Takaki, T. Kawano,
R. Nakamura, S. Furui, Y. Fukazawa (Hiroshima U.),
M. Yamauchi, N. Ohmori, M. Akiyama (Univ. of Miyazaki),
K. Yamaoka (Nagoya U.),  S. Sugita (Ehime U.),
Y. E. Nakagawa, M. Kokubun, T. Takahashi (ISAS/JAXA),
W. Iwakiri (RIKEN), Y. Hanabata (ICRR), Y. Urata (NCU),
K. Nakazawa, K. Makishima (Univ. of Tokyo)
on behalf of the Suzaku WAM team, report:


The short GRB 130628A (Byrne et al. GCN 14969
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 ) was detected by the the
Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of
50 keV - 5 MeV at 12:44:04.634 UT (=T0). The observed light curve shows
a single peak with a duration (T90) of about 2.4 seconds. The fluence in
100 - 1000 keV was 3.70 (+0.65/-0.71) x 10^-6 erg/cm2. The 1-s peak flux
measured from T0+2 s was 2.93 (+0.54/-0.71) photons/cm2/s in the same
energy range.

Preliminary result shows that the time-averaged spectrum from T0-5 s to
T0+5 s is well fitted by a single power-law with a photon index of 2.11
(+0.41/-0.31) (chi2/d.o.f = 20.3/15).

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

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