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GRB 120519A

GCN Circular 13313

Subject

IPN Triangulation of GRB 120519A (short/hard)

Date

2012-05-21T15:23:28Z (13 years ago)

From

Valentin Pal'shin at Ioffe Inst <val@mail.ioffe.ru>

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

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

V. Connaughton, M. Briggs, and C. Meegan, on behalf of the Fermi
GBM team,

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,

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

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

G. Di Cocco, F. Fuschino, M. Galli, C. Labanti, and M. Marisaldi,
on behalf of the AGILE MCAL team, report:

The short-duration, hard GRB 120519A has been observed by Fermi (GBM 
trigger 359140696), Konus-Wind, Swift (BAT),  MESSENGER (GRNS), INTEGRAL 
(SPI-ACS), Suzaku (WAM), and AGILE (MCAL), so far, at about 62295 s UT 
(17:18:15). The burst was outside the coded field of
view of the BAT.

We have triangulated it to a preliminary, 3 sigma error box whose
coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   178.366 (11h 53m 28s) +22.407 (+22d 24' 24")
  Corners:
   179.899 (11h 59m 36s) +24.184 (+24d 11' 02")
   178.690 (11h 54m 46s) +23.008 (+23d 00' 31")
   176.909 (11h 47m 38s) +20.581 (+20d 34' 53")
   178.049 (11h 52m 12s) +21.803 (+21d 48' 09")
  ---------------------------------------------
The error box area is 0.60 sq. deg, and its maximum
dimension is 4.5 deg.

This box may be improved.

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

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB120519_T62298/IPN/

GCN Circular 13315

Subject

Konus-Wind observation of GRB 120519A

Date

2012-05-21T16:04:56Z (13 years ago)

From

Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>

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 short-duration hard GRB 120519A
(IPN localization: Golenetskii at al., GCN 13313Loading...
 
 )
triggered Konus-Wind at T0=62298.004s UT (17:18:18.004)

The light curve shows a series of overlapping pulses
with a total duration of ~1.2 s.
The emission is seen up to ~7.5 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB120519_T62298/

As observed by Konus-Wind the burst
had a fluence of 3.7(-1.1,+1.5)x10-6 erg/cm2,
and a 16-ms peak flux, measured from T0,
of 1.3(-0.4,+0.5)x10-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).

The spectrum of the burst (measured from T0 to T0+0.256 s)
is well fit in the 20 keV - 10 MeV range
by a power law with exponential cutoff model, for which
alpha = -0.5 (-0.3, +0.3),
and Ep = 740(-240, +450) keV,
chi2 = 22.9/22 dof.

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

GCN Circular 13350

Subject

GRB 120519A: Suzaku WAM observation of the prompt emission

Date

2012-05-30T07:29:10Z (13 years ago)

From

Makoto Tashiro at Saitama U/Swift <tashiro@phy.saitama-u.ac.jp>

A. Sakamoto, M. Tashiro, Y. Terada, W. Iwakiri, T. Yasuda, K. Takahara,
M. Asahina, S. Kobayashi, 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 short GRB 120519A (IPN; Pal'shin et al., GCN 13313Loading...
 
 , Konus-Wind;
Golenetskii et al., GCN 13315Loading...
 
 ) triggered the Suzaku Wide-band All-sky 
Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 
17:18:14.64 UT (=T0).

The observed light curve shows a multi-peaked structure starting at
T0-0.2 s, ending at T0+0.6 s, with a duration (T90) of about 0.72 
seconds. The fluence in 100 - 1000 keV was 1.45(-0.28 +0.09) x 10^-6 
erg/cm^2. The 1-s peak flux measured from T0-0.5s was 2.76(-0.33 +0.18) 
photons/cm^2/s in the same energy range.

Preliminary result shows that the time-averaged spectrum from T0-0.5s to
T0+0.5s is well fitted by a power-law with exponential cutoff model:
dN/dE ~ E^{-alpha} * exp(-(2-alpha)*E/Epeak) with
alpha 0.41(-0.41 +0.58), and Epeak 736(-141 +226) keV
(chi^2/d.o.f. = 16.9/24).

In case we fit the same spectrum by a GRB Band model with a fixed
beta of 2.5, the best fit parameters and their errors are,
low-energy photon index alpha: -0.10(-0.92 +1.60),
and the peak energy Epeak: 611(-146 +279) keV (chi^2/d.o.f = 20.0/24).


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

----
The light curves for this burst are available at:

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