GRB 130715A

Andrew C. Collazzi (NASA/ORAU)
reports on behalf of the Fermi GBM Team:

"At 21:44:09.64 UT on 15 July 2013, the Fermi Gamma-ray Burst
Monitor (GBM) triggered and located GRB 130715A (trigger 
395617452 / 130715.906). The on-ground calculated location, using 
the Fermi GBM trigger data, is RA = 287.4, Dec = -31.1 (J2000 
degrees, equivalent to J2000 19h 9m, -31d 3'), with a statistical 
uncertainty of 1.0 degree (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 96 degrees.

The trigger occurred during a nadir pointing maneuver of
the Fermi spacecraft.

The GBM light curve shows single continuous emission with a 
duration (T90) of about 48 s (50-300 keV).  The peak flux during 
this interval is 7.75 +/- 0.31 ph/s/cm^2. The time-averaged 
spectrum from T0+0.00 to T0+61.44 s is best fit by a Band function
with Epeak = 314.60 +/- 12.40, alpha = -0.58 +/- 0.03, 
beta = -2.44 +/- 0.12. The fluence (10-1000 keV) in this time interval 
is (4.7 +/- 0.061)E-05 erg/cm^2.

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

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 long GRB 130715A (Andrew et al GCN15005
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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 21:44:38.377 UT (=T0).

The observed light curve shows double-peaked structure starting at
T0-30s, ending at T0+62s with a duration (T90) of about 46 seconds.
The fluence in 100 - 1000 keV was 3.38(+0.31/-0.27)x10^-5 erg/cm^2.
The 1-s peak flux measured from T0s was 2.66(+0.49/-1.36) photons/cm^2/s
in the same energy range.

Preliminary result shows that the time-averaged spectrum from T0-30s to
T0+62s is well fitted by a power-law with exponential cutoff model :
   dN/dE ~  E^{-alpha} * exp(-(2-alpha)*E/Epeak) with
   alpha       1.66(+0.31/-0.65), and
   Epeak       527(+429/-274) keV (chi^2/d.o.f. = 10.2/13).

All the quoted errors are at statistical 90% confidence level, in which
the systematic uncertainties are 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