GRB 140320C
GCN Circular 16007
Subject
GRB 140320C: A long GRB detected by INTEGRAL
Date
2014-03-20T14:48:47Z (11 years ago)
From
Sandro Mereghetti at IASF/CNR <sandro@iasf-milano.inaf.it>
S.Mereghetti (IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo,
E.Filippova (ISDC, Versoix), and J.Borkowski (CAMK, Torun) on behalf of
the IBAS Localization Team report:
a gamma ray burst lasting about 30 s has been detected by IBAS in the
IBIS/ISGRI data at 13:17:20 UT of March 20, 2014.
The refined coordinates (J2000) are:
R.A.= 134.4175 deg
DEC.= +71.2002 deg
with an uncertainty of 3 arcmin (90% c.l.).
A preliminary analysis gives a peak flux of about 0.15 counts/cm2/s
(20-200 keV, 1-s integration time) and a fluence in the same energy range
of about 2e-7 erg/cmq.
A plot of the light curve will be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html
GCN Circular 16008
Subject
GRB 140320C: FTN optical observations
Date
2014-03-20T15:10:15Z (11 years ago)
From
Andrea Melandri at INAF-OAB <andrea.melandri@brera.inaf.it>
A. Melandri (INAF-OAB), C. Guidorzi (U. Ferrara), A. Gomboc (U. Ljubljana) and C. G. Mundell (LJMU) on behalf of a larger collaboration report:
The 2-m Faulkes Telescope North automatically began observing INTEGRAL GRB 140320C (Mereghetti et al. GCN 16007) on March 20 at 13:21:39.3 UT (~4.3 min after the burst trigger).
We do not find any fading candidate in our first 10s image within the entire INTEGRAL error circle down to a limiting magnitude or R>19.5 (5 sigma upper limit).
GCN Circular 16009
Subject
GRB 140320C: MASTER optical observations
Date
2014-03-20T15:12:11Z (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
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
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)
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in Blagoveschensk was pointed to the GRB140320C (Mereghetti et.
al GCN 16007) 25 sec after notice time and 33 sec after trigger time at 2014-03-20 13:18:13 UT in two
polarizations. We haven`t found optical
transient within INTEGRAL error-box on single and coadd images.
The 5-sigma upper limit has been about 16.8 mag on first single 10 sec
image.
On coadd of 11 first images with different exposures and total exosure
time 610 sec the 5-sigma upper limit has been about 20.0 mag in bosh
polarization.
The message may be cited.
GCN Circular 16012
Subject
GRB 140320C: Mondy optical observations
Date
2014-03-20T20:31:29Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A.Volnova (IKI), E. Klunko (ISTP), I. Korobtsev (ISTP), M. Eselevich
(ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up
collaboration:
We observed the field of GRB 140320C (Mereghetti et al., GCN 16007)
with AZT-33IK telescope of Mondy observatory starting on Mar. 20 (UT)
15:12:44. We obtained several images of 120 s exposure in R-filter.
Within entire INTEGRAL error circle we identified sources which are not
presented in the DSS2(R) image:
N RA(J2000) Dec. (J2000)
1. 08 57 55.04 +71 13 36.5
2. 08 57 16.68 +71 10 10.6
3. 08 57 34.11 +71 11 55.0
(Uncertainty of all coordinates are 1 arcsec.)
However, our images are more deep than DSS2(R), down to a limiting
magnitude R~21, and at present time we cannot determine whether the
sources are fading.
GCN Circular 16015
Subject
GRB 140320C: Swift-XRT detection of the X-ray afterglow
Date
2014-03-21T07:10:35Z (11 years ago)
From
Kim Page at U.of Leicester <klp5@leicester.ac.uk>
C. Pagani and K.L. Page (U. Leicester) report on behalf of the Swift-XRT team:
We have analysed 4 ks of XRT data for the INTEGRAL detected GRB 140320C
(Mereghetti et al. GCN Circ. 16007), from 19.5 s to 37.2 ks after the
trigger. The data are entirely in Photon Counting (PC) mode. We detect an
uncatalogued X-ray source. Using 1552 s of XRT Photon Counting mode data
astrometrically corrected X-ray position (using the XRT-UVOT alignment and
matching UVOT field sources to the USNO-B1 catalogue): RA, Dec =
134.39401, 71.19829, which is equivalent to:
RA(J2000) =� 08 57 34.56
Dec(J2000) = 71 11 53.9
with an uncertainty of 2.6 arcsec (radius, 90% confidence). This is 28
arcsec from the initial INTEGRAL position, within the INTEGRAL error
circle. This is consistent with the optical source N3 from Volnova et al.
(GCN 16012).
The source has faded from a count rate of 0.013 (+/- 0.003) at 20.5 ks
after the INTEGRAL trigger to 0.003 (+0.002,-0.001) by 33.9 ks, so we
confirm it as the X-ray afterglow.
This circular is an official product of the Swift-XRT team.
GCN Circular 16017
Subject
GRB 140320C: Swift-XRT observations
Date
2014-03-21T10:34:38Z (11 years ago)
From
Claudio Pagani at U of Leicester <cp232@star.le.ac.uk>
C. Pagani, K.L. Page and P.A. Evans report on behalf of the Swift-XRT
team:
We have analysed 4.0 ks of XRT data for the INTEGRAL-detected burst:
GRB 140320C, from 19.5 ks to 37.3 ks after the INTEGRAL trigger. The
data are entirely in Photon Counting (PC) mode. An X-ray source is
detected within the INTEGRAL error circle. Using 1552 s of PC mode data
and 1 UVOT images, we find an enhanced XRT position (using the XRT-UVOT
alignment and matching UVOT field sources to the USNO-B1 catalogue):
RA, Dec = 134.39421, +71.19839 which is equivalent to:
RA (J2000): 08h 57m 34.61s
Dec(J2000): +71d 11' 54.2"
with an uncertainty of 2.6 arcsec (radius, 90% confidence). This
position is 27 arcsec from the INTEGRAL position.
The light curve can be modelled with a power-law decay with a decay
index of alpha=2.8 (+1.0, -1.7).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 1.3 (+0.9, -0.3) and an
absorption column consistent with the Galactic value of 3.6 x 10^20
cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed)
0.3-10 keV flux conversion factor deduced from this spectrum is 5 x
10^-11 (5 x 10^-11) erg cm^-2 count^-1.
If the light curve continues to decay with a power-law decay index of
2.8, the count rate at T+24 hours will be 2.4 x 10^-4 count s^-1
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00020371.
This circular is an official product of the Swift-XRT team.
GCN Circular 16021
Subject
GRB 140320C: Swift/UVOT Upper Limits
Date
2014-03-21T13:05:13Z (11 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (UCL-MSSL) and J. K. Cannizzo (NASA/UMBC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 140320C
19435 s after the INTEGRAL trigger (Mereghetti et al., GCN Circ. 16007).
No optical afterglow consistent with the XRT position
(Pagani et al., GCN Circ. 16015; 16017) is detected in the initial
UVOT exposures.
Preliminary 3-sigma upper limits 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
white 20211 32984 1056 >22.1
v 20986 33302 1087 >20.5
u 19435 37277 1741 >21.4
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.07 in the direction of the burst
(Schlegel et al. 1998).
GCN Circular 16022
Subject
GRB 140320C: Mini-GWAC prompt observation
Date
2014-03-21T14:03:44Z (11 years ago)
From
L.P. Xin at NAOC <xlp@bao.ac.cn>
J. Y. Wei, L. P. Xin, Y. L. Qiu, J. S. Deng, J. Wang,
X. H. Han, C. Wu, H. L. Huang, X. M. Meng,
Y. F. Xuan and Y. Xu on behalf of EAFON report:
Mini-GWAC system is located at Xinglong observatory,
National Astronomical Observatories, China,
including 6 mounts and 12 Canon 85/f1.2 cameras.
Each mount is equipped with 2 cameras.
For each camera, the Apogee U9000X CCD was used, which gives
about 400 square degree of FOV. The total field of view of this system
is about 5000 sq.deg.
The field of INTERGRAL GRB 140320C (Mereghetti et al. GCN 16007)
was monitored by Mini-GWAC system continuously
during about 2 hrs before and 4 hrs after the burst.
The exposure time for each frame is 10 sec.
No any new optical counterpart in single frame
was detected down to the 5 sigma upper limit of 13.1 mag
calibrated by nearby USNO B1.0 R2 mag,
at the epoch of prompt emission phase.
Combining 5 frames after the burst trigger initially
with total exposure time of 50 sec
gives a 5 sigma upper limit of 13.7 mag.
This message may be cited.
GCN Circular 16036
Subject
GRB 140320C: Mondy optical observations and afterglow confirmation
Date
2014-03-25T12:03:24Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A.Volnova (IKI), E. Klunko (ISTP), I. Korobtsev (ISTP), M. Eselevich
(ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up
collaboration:
We observed the field of GRB 140320C (Mereghetti et al., GCN 16007)
with AZT-33IK telescope of Mondy observatory starting on Mar. 20 (UT)
15:12:44 and Mar. 23 (UT) 15:37:46. Several images of 120 s exposure in
R-filter ere obtained in both epochs. After receiving all data sets we
refined our measurements of the optical source N3 reported early as one
of a possible afterglow candidate (Volnova et al., GCN 16012). Enhanced
position of the source is (J2000) 08 57 34.40 +71 11 54.7 (uncertainty
of 0.35" is each coordinate) is within XRT error circle and apart 1.1"
of the center of XRT localization (Pagani et al., GCN 16017). A
photometry of the source:
date UT start t-T0 Exp. Filter OT err
(mid, days) (s)
2014-03-20 15:12:44 0.08918 1560 R 22.63 0.24
2014-03-20 15:38:46 0.12147 3840 R 23.14 0.28
2014-03-23 15:37:46 3.13782 6960 R 23.5 (3 sigma upper limit)
is based on two USNO-B1.0 stars (R2 mags)
N Id RA Dec. R
1 1612-0081687 08:57:32.78 +71:12:43.9 18.9
3 1611-0081293 08:57:55.56 +71:10:05.6 18.8
Based on our photometry we confirm the source N3 (Volnova et al., GCN
16012) is the afterglow of GRB 140320C.
Finding chart can be found at
http://grb.rssi.ru/GRB140320C/140320C_AZT33IK_fc.png