GRB 140311C
GCN Circular 15977
Subject
GRB 140311C: Fermi GBM Detection
Date
2014-03-12T22:28:45Z (11 years ago)
From
Matthew Stanbro at UAH/Fermi <mcs0001@uah.edu>
M. Stanbro (UAH) reports on behalf of the Fermi GBM Team:
"At 14:49:13.10 UT on 11 March 2014, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 140311C (trigger 416242156/140311618).
iPTF reported an optical counterpart candidate for this
source (L.P. Singer et al. 2014, GCN 15971).
The GBM on-ground location, using the Fermi GBM trigger data,
is RA = 183.7 , DEC = +62.81 (J2000 degrees, equivalent to
12h 14m, 62d 48'), with an uncertainty of 3 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 to the Fermi LAT boresight is 53 deg.
The GBM light curve consists of single peak with a
duration (T90) of 14 s (50-300 keV).
The time-averaged spectrum from T0-2 s to T0+12 s is
well fit by a Band function parameterized as Epeak = 56 +/- 6 keV,
alpha = -0.9 +/- 0.16 and beta = -2.4 +/- 0.12.
The event fluence (10-1000 keV) in this time interval is
(4.6 +/- 0.2)E-06 erg/cm^2. The 1.0-sec peak photon flux measured
starting from T0+0.3 s in the 10-1000 keV band
is 10.7 +/- 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 15981
Subject
GRB 140311C: MASTER before, during and after trigger optical observations
Date
2014-03-13T15:55:07Z (11 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk
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
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 (MASTER-Net: http://observ.pereplet.ru)
located in Blagoveschensk was pointed to the GRB140311C (M. Stanbro,
GCN15977) 14 sec after
notice time and 29 sec after trigger time at 2014-03-11 14:49:42.721 UT .
On our first (10s exposure) set we haven`t found optical transient within
FERMI error-box (ra=12 47 02 dec=+58 49 46 FOV=2x4 square degrees).
The 5-sigma upper limit has been about 16.3 mag
MASTER II robotic telescope located in Tunka was pointed to the
GRB140311C (M. Stanbro,GCN15977) 35 sec after trigger time at 2014-03-11
14:49:48.874 UT.
On our first (10s exposure) set we haven`t found optical transient within
FERMI error-box (ra=12 47 02 dec=+58 49 46 FOV=2x4 square degrees).
The 5-sigma upper limit has been about 16.0 mag.
We have done survey of the large area around initial error box up to ~18
unfiletred magnitude which was begun in 15 minutes after GRB.
The GBM error box (M. Stanbro, GCN15977) completely observed by 4-th Very
Wide Field Cameras (FOV = 4x380 square degrees) before, during and after
GRB without time gap up to 11 unfiltered magnitude limit on each 5 sec
image. The reduction is continued now.
The IPN is very desirable.
The covarege map is available at
http://master.sai.msu.ru/static/GRB/GRB140311C_map.png . The elliptical
region is the Fermi GBM 1 sigma+3 degrees systematic error box.
The message may be cited.
GCN Circular 15982
Subject
GRB 140311C: Swift-XRT and UVOT observations
Date
2014-03-13T18:05:25Z (11 years ago)
From
Valerio D'Elia at ASDC <delia@asdc.asi.it>
V. D'Elia (ASDC), L.M.Z. Hagen (PSU), L. Izzo (URoma/ICRA), P.
D'Avanzo (INAF-OAB), S. Holland (STScI) report on behalf of the Swift
team:
We report on Swift observations of the field of the GBM discovered
GRB140311C burst (Stanbro, GCN Circ 15977), for which a possible
optical counterpart was reported by iPTF (Singer et al., GCN Circ
15971).
XRT began observing the field on 2014-03-12 at 23:43:48 UT, i.e., �118
ks after the trigger, for a total of 2.7ks. No source is detected at
the iPTF coordinates, nor in the whole XRT field of view. The 3-sigma
upper limit on the count rate is 5E-03 cts/s.
The Swift/UVOT began settled observations of the field of GRB 140311C
118480 s after the trigger. No optical afterglow consistent with the
iPTF position (Singer et al., GCN Circ. 15971) is detected in the
initial UVOT exposure. The preliminary 3-sigma upper limit using the
UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358,
373) for the initial exposures are:
Filter�������� T_start(s)�� T_stop(s)����� Exp(s)�������� Mag
u�������������� 118480������ 125414�������� 2916������� >21.43
The magnitude in the table is not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.01 in the direction of
the burst (Schlegel et al. 1998).� We note that the photometry may be
affected by a nearby bright foreground star.
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GCN Circular 15983
Subject
GRB 140311C: MASTER optical observations
Date
2014-03-14T15:01:38Z (11 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
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
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk
Irkutsk State University
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)
As previously reported (Yurkov et. al. GCN 15981) MASTER VWF robotic very
wide field cameras (FOV=2x384 square degrees, D=72mm, f/1.2, 1 pix = 22
arcsec) installed on MASTER-II robotic telescope in Tunka covered full
FERMI GBM error-box (M. Stanbro, GCN15977) before, during and after GRB.
We haven`t found credible optical transient with 3-sigma upper limit
10.5m.
We also didn't find credible optical counterpart on the survey (Yurkov et.
al. GCN 15981) of part of error box carried out directly after GRB on
MASTER-II robotic telescope up to 18 mag.
The synchronous move of FERMI GBM error-box available here
http://master.sai.msu.ru/static/GRB/GRB140311C_FERMI.gif
http://master.sai.msu.ru/static/GRB/GRB140311C_diff.gif
The circle on move is the Fermi GBM 1 sigma+3 degrees systematic error
box.
Also very wide field cameras covered a place of possible iPTF
counterpart (Singer et. al. GCN 15971).
Unfortunately the bright star is projected into OT place. We didn't find a
noticeable brightening of this star.
The syncronous move from very wide field cameras of possible iPTF
counterpart place available here
http://master.sai.msu.ru/static/GRB/GRB140311C_IPTF.gif
This place was not covered on MASTER-II survey.
The Prompt Optical to Gamma Fluence Ratio during this burst is:
F_opt/F_gamma <~ 1 : 820.
The covarege map is available at
http://master.sai.msu.ru/static/GRB/GRB140311C_map1.png .
The message may be cited.