GRB 140320D
GCN Circular 16023
Subject
IPN Triangulation of very intense GRB 140320D
Date
2014-03-21T16:28:50Z (11 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
K. Hurley and J. Goldsten, on behalf of the MESSENGER NS 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
S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer, on
behalf of the Swift-BAT team, report:
The long-duration very intense GRB 140320D has been observed by
Konus-Wind, INTEGRAL (SPI-ACS), Swift (BAT), and MESSENGER (GRNS), so
far, at about 73297 s UT (20:21:37). 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:
87.893 (05h 51m 34s) +85.429 (+85d 25' 46")
Corners:
98.997 (06h 35m 59s) +86.721 (+86d 43' 15")
98.219 (06h 32m 53s) +87.023 (+87d 01' 23")
81.849 (05h 27m 24s) +84.026 (+84d 01' 35")
83.033 (05h 32m 08s) +83.741 (+83d 44' 28")
---------------------------------------------
The error box area is 0.635 sq. deg, and its maximum dimension is 3.474
deg (the minimum one is 0.196 deg).
This box may be improved.
A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB140320_T73298/IPN/
The time history and spectrum will be given in a forthcoming GCN Circular.
GCN Circular 16025
Subject
Konus-Wind observation of GRB 140320D
Date
2014-03-21T17:15:12Z (11 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M.
Ulanov, D. Svinkin, A. Tsvetkova, and T. Cline on behalf of the
Konus-Wind team, report:
A very intense, long-duration, hard-spectrum GRB 140320D (IPN
triangulation: K. Hurley et al., GCN 16023) triggered Konus-Wind at
T0=73298.804 s UT (20:21:38.804).
The burst light curve shows a bright, double-peaked pulse with a total
duration of ~50 s. The emission is seen up to ~10 MeV.
As observed by Konus-Wind, the burst had
a fluence of (2.1 +/- 0.1)x10^-4 erg/cm2, and
a 64-ms peak flux, measured from T0+15.456 s, of (6.7 +/- 0.7)x10^-5
erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum (measured from T0 to T0+45.568 s) is best fit
in the 20 keV - 10 MeV range by the GRB (Band) function with the
following model parameters:
the low-energy photon index alpha = -0.83 (-0.03,+0.03),
the high energy photon index beta = -2.75 (-0.32,+0.20),
the peak energy Ep = 575 (-30,+32) keV,
chi2 = 100/87 dof.
The spectrum near the maximum count rate
(measured from T0+15.360 to T0+15.872 s)
is best fit in the 20 keV - 10 MeV range
by the GRB (Band) function with the following model parameters:
the low-energy photon index alpha = -0.30 (-0.11,+0.13),
the high energy photon index beta = -2.59 (-0.62,+0.30),
the peak energy Ep = 655 (-89,+102) keV,
chi2 = 82/56 dof.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB140320_T73298/
All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.
GCN Circular 16040
Subject
GRB 140320D: Suzaku WAM observation of the prompt emission
Date
2014-03-29T03:42:36Z (11 years ago)
From
Tetsuya Yasuda at Saitama U <yasuda@heal.phy.saitama-u.ac.jp>
T. Yasuda, M. Tashiro, Y. Terada, Y. Ishida, H. Ueno, S. Sugimoto
S. Koyama, S. Takeda, T. Nagayoshi (Saitama U.),
M. Yamauchi, N. Ohmori, M. Akiyama, R. Kinoshita (Univ. of Miyazaki),
M. Ohno, K. Takaki, T. Kawano, R. Nakamura, S. Furui, Y. Fukazawa (Hiroshima U.),
K. Yamaoka (Nagoya U.), S. Sugita (Ehime U.), W. Iwakiri(RIKEN),
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, long, and IPN localized GRB 140320D
(Hurley et al., GCN 16023; Golenetskii et al., GCN 16025)
triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an
energy range of 50 keV - 5 MeV at 20:21:38.309 UT (=T0).
The observed light curve shows a multi-peaked structure
lasting from T0-5 s to T0+50 s with a duration (T90) of about 22 seconds.
The fluence in 100 - 1000 keV was 1.14 (+0.03, -0.04) x10^-4 erg/cm^2.
The 1-s peak flux measured from T0+17 s was 35.4 (+0.8, -0.9) photons/cm^2/s
in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0-10.5 s to T0+49.5 s
is well fitted in 200 keV to 5 MeV by a power-law with exponential cutoff model:
dN/dE ~ E^{-alpha} * exp(-(2-alpha)*E/Epeak) with
alpha 0.99 (+0.12, -0.13), and
Epeak 746 (+33, -31) keV (chi^2/d.o.f. = 72.1/48).
Fitting by a GRB Band model yields the following parameters:
the low-energy photon index alpha: -0.97 (+0.14, -0.13),
the high-energy photon index beta: <-3.62,
and the peak energy Epeak: 742 (+34, -22) keV (chi^2/d.o.f = 71.4/47).
Due to the brightness of this burst, a 3% systematic error was added for
low energy channels. All the quoted errors are at statistical 90% confidence level.
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
GCN Circular 16043
Subject
GRB 140320D: MASTER optical observations
Date
2014-03-30T08:42:43Z (11 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk
Irkutsk State University
E. Gorbovskoy, V. Lipunov, M. Pruzhinskaya, D.Denisenko, V.Kornilov, N.Tyurina,
P.Balanutsa, A.Kuznetsov, V.V.Chazov, D.Kuvshinov
Lomonosov Moscow State University, Sternberg Astronomical Institute
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory
V.Krushinski, I.Zalozhnih, A. Popov
Ural Federal University, Kourovka
Hugo Levato and Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest
Observatorio Astronomico Felix Aguilar (OAFA)
MASTER II robotic telescope located in Tunka (MASTER-Net:
http://observ.pereplet.ru) have done a survey of the large area
around IPN error box (Hurley et. al. GCN16023). The survey was started
2014-03-21 13:15:06 i.e. 16h 53m after the burst and proceeded during 5
hours. The 5 sigma unfiltered upper limit was ~17.5 m on single
180 image and ~18.8 m on coadd of 5 images with total exposure 900 s.
We haven`t found credible optical afterglow candidate within IPN error box.
The covarege map is available at
http://master.sai.msu.ru/static/GRB/GRB140320D_map.png
The message may be cited.