GRB 120328B
GCN Circular 13157
Subject
IPN Triangulation of GRB 120328B (long/intense)
Date
2012-03-28T15:05:38Z (13 years ago)
From
Valentin Pal'shin at Ioffe Inst <val@mail.ioffe.ru>
K. Hurley, and J. Goldsten, on behalf of the MESSENGER GRNS GRB team,
S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks,
D. Svinkin, and T. Cline on behalf of the Konus-Wind team,
V. Connaughton, M. Briggs, and C. Meegan, on behalf of the Fermi
GBM team,
S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer, on
behalf of the Swift-BAT 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
G. Di Cocco, F. Fuschino, M. Galli, C. Labanti, and M. Marisaldi,
on behalf of the AGILE MCAL team, report:
The long-duration, intense GRB 120328B has been observed by Fermi (GBM:
trigger 354608782), Konus-Wind, MESSENGER (GRNS), INTEGRAL (SPI-ACS),
Swift (BAT), and AGILE (MCAL), so far, at about 23181 s UT (06:26:21).
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:
229.038 (15h 16m 09s) +25.299 (+25d 17' 58")
Corners:
227.666 (15h 10m 40s) +28.399 (+28d 23' 55")
228.177 (15h 12m 43s) +28.152 (+28d 09' 05")
230.230 (15h 20m 55s) +22.104 (+22d 06' 15")
229.765 (15h 19m 04s) +22.401 (+22d 24' 05")
---------------------------------------------
The error box area is 2.15 sq. deg, and its maximum
dimension is 6.7 deg.
This box can be improved.
The time history and spectrum will be given in forthcoming GCN Circulars.
A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB120328_T23186/IPN/
GCN Circular 13158
Subject
Konus-Wind observation of GRB 120328B
Date
2012-03-28T15:07:31Z (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 long intense GRB 120328B
(IPN localization: Hurley at al., GCN 13157)
triggered Konus-Wind at T0=23186.645s UT (06:26:26.645)
The light curve shows two main overlapping pulses
which peaks are separated by ~15 s.
A total burst duration of the burst ~50 s.
The emission is seen up to ~8 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB120328_T23186/
As observed by Konus-Wind the burst
had a fluence of (1.2 � 0.1)x10-4 erg/cm2,
and a 256-ms peak flux, measured from T0+4.352 s,
of (1.5 � 0.2)x10-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst
(measured from T0 to T0+50.176 s)
is best fitted in the 20 keV - 10 MeV range
with the GRB (Band) model, for which:
the low-energy photon index alpha = -1.08 (-0.07, +0.07),
the high energy photon index beta = -2.2 (-0.2, +0.1),
the peak energy Ep = 267(-30, +36) keV,
chi2 = 111/86 dof.
The spectrum at the maximum count rate
(measured from T0+0.256s to T0+4.864 s) is best fitted
is best fitted in the 20 keV - 10 MeV range
with the GRB (Band) model, for which:
the low-energy photon index alpha = -0.59 (-0.11, +0.09),
the high energy photon index beta = -2.2 (-0.2, +0.1),
the peak energy Ep = 430(-54, +66) keV,
chi2 = 90.4/82 dof.
All the quoted results are preliminary.
All the quoted errors are at the 90% confidence level.
GCN Circular 13162
Subject
long/intense GRB 120328B: MASTER follow up observations
Date
2012-03-28T16:26:33Z (13 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina,
N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, A.Kuznetsov,
A.Sankovich
Moscow Lomonosov State University, Sternberg Astronomical Institute,
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk
Irkutsk State University
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.Zalozhnich, A. Popov, A. Bourdanov, A. Punanova
Ural Federal University
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 (MASTER-Net: http://observ.pereplet.ru) located in
Tunka was started to survey IPN error box of the long/intense GRB 120328B
(Hurley et al., GCN Circ 13157) 6 hours after GRB time at 2012-03-28 13:26:23 UT.
The eroor box was arised. The weather was changed. The better images limit
was about 18 unfiltered magnitudes.
There is no OT inside IPN error box with 18 mag limit.
MASTER-Tunka auto-detection system discovered faint OT source (4.1 sigma)
at (RA, Dec) = 15h 06m 01.01s +28d 41m 59.8s on 2012-03-28.59161 UT (~7h45
min after GRB time) outside error IPN box (see map
http://observ.pereplet.ru/images/GRB120328B_IPN_map_MASTER$
GRB120328B_IPN_map_MASTER.png ).
The OT unfiltered magnitude is 17.9m (limit 18.0m).
The OT is marginally seen at several images 2 images. There is no minor
planet at this place.
There is no known source at this place.
We have reference image without OT on 2011-06-04.67172 UT with unfiltered
magnitude limit 20.1m.
Follow up observations will be continuated.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/150601.01284159.8.png
The message may be cited.
GCN Circular 13163
Subject
GRB 120328B: Fermi GBM detection
Date
2012-03-28T19:55:22Z (13 years ago)
From
Suzanne Foley at MPE <sfoley@mpe.mpg.de>
S. Foley (UCD)
reports on behalf of the Fermi GBM Team:
"At 06:26:20.95 UT on 28 March 2012, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 120328B (trigger 354608782 / 120328268).
The GBM on-ground location is consistent with the IPN error box
(Hurley at al., GCN 13157).
The angle from the Fermi LAT boresight is 69 degrees.
The GBM light curve consists of two main pulses
with a duration (T90) of about 30.5 s (50-300 keV).
The time-averaged spectrum from T0+3.072 s to T0+34.816 s is
best fit by a Band function with Epeak = 177.90 (+4.35/-4.16) keV,
alpha = -0.75 +/-0.02, and beta = -2.00 +/-0.02
(CSTAT 1669.1 for 721 d.o.f.).
The event fluence (10-1000 keV) in this time interval is
(7.74 +/- 0.02)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+5.95 s in the 10-1000 keV band
is 33.5 +/- 0.4 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
GCN Circular 13165
Subject
GRB 120328B: Fermi-LAT Observations
Date
2012-03-28T23:43:31Z (13 years ago)
From
Giacomo Vianello at SLAC <giacomov@slac.stanford.edu>
G.Vianello (CIFS/SLAC), V. Vasileiou (CNRS/IN2P3/LUPM), D.Kocevski
(Stanford) report on behalf of the Fermi LAT Team:
Fermi-LAT has detected high energy emission from GRB 120328B in ground
analysis. The GRB was triggered on by Fermi-GBM at 06:26:20 on March
28, 2012 (trigger 354608782, GCN 13163), and by Konus-Wind (GCN
13158).
The best available position, provided by the IPN (GCN 13157), is ~66
deg off-axis, outside of the Fermi/LAT nominal field of view for the
standard data analysis. Moreover, the zenith angle is ~105 deg, well
within the region strongly contaminated by gamma-ray emission from the
Earth's limb.
Using a non-standard data selection most sensitive in the tens-of-MeV
energy range and with a broader acceptance, we
significantly detected the burst during the time interval of the
prompt emission between T0 and ~T0+30 s. The significance of the
excess corresponds to ~8 sigma. This data selection has insufficient
spatial resolution to provide a reliable LAT localization.
The GRB position entered the nominal field of view of the LAT ~2200 s
after the trigger. A standard likelihood analysis on the time interval
T0+2200 s - T0+3500 s does not show any excess at the position of the
GRB.
The Fermi LAT point of contact for this burst is Giacomo Vianello
(giacomov@slac.stanford.edu).
GCN Circular 13193
Subject
GRB 120328B: Pi of the Sky simultaneous upper limits
Date
2012-04-03T13:06:43Z (13 years ago)
From
Lech Wiktor Piotrowski at U Warsaw <lewhoo@fuw.edu.pl>
T.Batsch,A.Majcher,A.Majczyna,K.Nawrocki,M.Sokolowski,G.Wrochna (NCBJ,
Swierk),
M.Cwiok,L.W.Piotrowski,M.Zaremba,A.F.Zarnecki (University of Warsaw),
K.Malek,L.Mankiewicz,R.Opiela,M.Siudek,V.Repei (CFT PAN),
G.Kasprowicz (Warsaw University of Technology),
from the "Pi of the Sky" collaboration ( http://grb.fuw.edu.pl ).
The wide field "Pi of the Sky South" telescope, installed in
the private observatory of Alain Maury in San Pedro de Atacama
(http://grb.fuw.edu.pl/pi/index.html#spda_site.htm) observed coordinates
of the GRB 120328B prior, during and after the reported IPN flash
detection. No new source was identified. Following limiting magnitudes
have been set:
t_start - t0 [s] t_exp start (UT) end (UT) 3-sigma limit
-15 10s 06:26:06 06:26:16 11.6
+1 10s 06:26:22 06:26:32 11.6
+16 10s 06:26:37 06:26:47 11.6
-165 20x10s 06:23:36 06:28:32 12.2
+152 20x10s 06:28:53 06:33:54 12.3
where limit is based on the reference star magnitudo in V filter.
We acknowledge support received from Alain Maury at SPdA Observatory.