GRB 131011A
GCN Circular 15328
Subject
GRB 131011A: GROND afterglow observations
Date
2013-10-13T07:41:49Z (12 years ago)
From
Vladimir Sudilovsky at MPE <vsudilov@mpe.mpg.de>
V. Sudilovsky, M. Tanga,
and J. Greiner (all MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 131011A (Kasliwal et al., GCN #15324)
simultaneously in g'r'i'z'JHKs with GROND (Greiner et al. 2008, PASP 120,
405) mounted at the 2.2 m MPG telescope at La Silla Observatory
(Chile).
Observations started at 03:30 UT on 13 October 2013.
They were performed at an average seeing of 1.3" and at and
average airmass of 1.2. We find the afterglow candidate reported by Kasliwal et al.
Based on the first 1500 sec g'r'i'z' and 1200 sec JHK exposure,
we estimate preliminary magnitudes (all in AB) of
g' = 21.9 � 0.1 mag
r' = 21.7 � 0.1 mag,
i' = 21.5 � 0.1 mag,
z' = 21.3 � 0.1 mag,
J = 21.1 � 0.1 mag,
H = 20.5 � 0.2 mag,
K = 20.2 � 0.4 mag,
Magnitudes are calibrated against nearby SDSS (griz) and 2MASS (JHK) stars, and
are not corrected for the Galactic foreground extinction corresponding to
a reddening of E_(B-V)= 0.02 mag in the direction of the burst
(Schlegel et al. 1998).
GCN Circular 15331
Subject
GRB 131011A: Fermi GBM detection
Date
2013-10-14T00:09:15Z (12 years ago)
From
Peter Jenke at MSFC <peter.a.jenke@nasa.gov>
P. Jenke (UAH) reports on behalf of the Fermi GBM Team:
At 17:47:34.99 UT on October 11 2013, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 131011A (trigger 403206457/131011741).
A candidate optical afterglow was found by iPTF (Kasliwal et al. 2013, GCN
15324) using the GBM on-ground location.
Additional follow-ups confirmed that the optical source has faded (Xu et
al. 2013, GCN 15325) and has a redshift of
z = 1.874 (Rau et al. 2013, GCN 15330). A weak X-ray
source consistent with the optical afterglow was detected by the
Swift XRT (Page et al. 2013, GCN 15329).
The angle of the burst direction to the Fermi LAT boresight is 74 degrees.
The GBM light curve consists of one main peak and a small
post burst with a combined duration (T90) of about 77 s (50-300 keV).
The time-averaged spectrum from T0-3 s to T0+25s is
well fit by a Band function with Epeak of 220 +/- 30 keV.
Alpha = -0.79 +/- 0.08 and Beta = -2.0 +/- 0.1.
The event fluence (10-1000 keV) in this time interval is
(6.60 +/- 0.03)E-05 erg/cm^2. The 1.0-sec peak photon flux measured
starting from T0+4.3 s in the 10-1000 keV band
is 4.3 +/- 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 15341
Subject
Fermi 403206457 / GRB 131011A: AAO optical observations
Date
2013-10-15T18:50:42Z (12 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (IKI), R. Inasaridze (AAO), G. Inasaridze (AAO), V.
Zhuzhunadze (AAO), Yu. Krugly (IA KhNU), I. Molotov (KIAM), A. Pozanenko
(IKI) report on behalf of larger GRB follow-up collaboration:
We observed the optical afterglow (Kasliwal et al. 2013, GCN 15324; Xu
et al. 2013, GCN 15325; Perley et al. 2013, GCN 15327; Sudilovsky et al.
2013, GCN 15328) of Fermi trigger 403206457 / GRB 131011A (Jenke, GCN
15331) with AS-32 (0.7m) telescope of Abastumani Observatory on Oct. 12
starting (UT) 22.32. We obtained several unfiltered images of 120 s
exposure. The optical afterglow is clearly visible in a stacked image in
coordinates (J2000) RA= 02 10 06.32 Dec= -04 24 40.5
(uncertainty of 0.33 arcseconds on both axes) which is coincide with
position reported by Kasliwal et al. (GCN 15324).
The photometry of combined image against nearby SDSS stars reported by
Xu et al. (GCN 15325), R magnitude, transformed by Lupton gri -> R
transformation is following:
Date T_start t-t0, exp, OT
(UT) mid, d s
2013-10-12 22:32:33 1.2218 26x120 21.33 +/- 0.09
A finding chart can be found at
http://grb.rssi.ru/GRB131011A/GRB131011A_AS32.png
GCN Circular 15343
Subject
GRB 131011A: Swift/UVOT Upper Limits
Date
2013-10-15T21:11:12Z (12 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>
L. M. Z. Hagen (PSU) and K. L. Page (U. Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began observations of the field of GRB 131011A
starting 83.9 ks after the Fermi trigger 403206457 (Kasliwal et al., GCN 15324).
No optical afterglow consistent with the PTF position 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
w2 83920 97601 4896 >22.10
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).
GCN Circular 15395
Subject
GRB 131011A: ATCA 34GHz upper limit
Date
2013-10-29T02:23:40Z (12 years ago)
From
Paul Hancock at U of Sydney <hancock@physics.usyd.edu.au>
P. Hancock (Curtin University/CAASTRO), T. Murphy, B. Gaensler, M. Bell, D.
Burlon (University of
Sydney/CAASTRO), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI)
We observed GRB131011A (GCN 15324) with the Australia Telescope
Compact Array at 34GHz for 55 minutes centered on 11:20UT Oct-17-2013 in
poor weather.
We detect no radio source at the optical location of the GRB and place a
3sigma upper limit of 120uJy on the flux of an
afterglow.
These observations were obtained as part of ATCA project C2689. We
thank the observatory staff for their support and scheduling the
observations. The Australia Telescope is funded by the Commonwealth of
Australia for operation as a National Facility managed by CSIRO.