GRB 161109A
GCN Circular 20155
Subject
GRB 161109A: Fermi-LAT detection
Date
2016-11-09T14:56:49Z (9 years ago)
From
Elisabetta Bissaldi at U.Innsbruk/IAPP <Elisabetta.Bissaldi@uibk.ac.at>
R. Desiante (INFN Torino), E. Bissaldi (Politecnico & INFN Bari),
F. Longo (University & INFN Trieste), M. Negro (University and INFN Torino),
and J. Racusin (NASA/GSFC) report on behalf of the Fermi-LAT team:
At 06:18:45.66 UT on November 09, 2016, Fermi-LAT detected
high-energy emission from GRB 161109A,
which was also detected by Fermi-GBM (trigger 500365129).
The best LAT on-ground location is found to be
RA, Dec: 157.86, 61.80 (degrees, J2000)
with an error radius of 0.26 deg (90% containment, statistical error only).
This was 75 deg from the LAT boresight at the time of the trigger.
The data from the Fermi-LAT show a significant increase
in the event rate that is spatially and temporally correlated
with the GBM emission with high significance.
More than 60 photons above 100 MeV and about 4 photons
above 1 GeV are observed between T0+400 s and T0+1800 s.
The highest-energy photon is a 3.5 GeV event which is
observed 600 seconds after the GBM trigger.
A Swift ToO has been requested for this burst.
The Fermi-LAT point of contact for this burst is
Francesco Longo (francesco.longo@ts.infn.it).
The Fermi-LAT is a pair conversion telescope designed to cover
the energy band from 20 MeV to greater than 300 GeV.
It is the product of an international collaboration between
NASA and DOE in the U.S. and many scientific institutions
across France, Italy, Japan and Sweden.
GCN Circular 20156
Subject
GRB 161109A: Fermi GBM observation
Date
2016-11-09T15:45:37Z (9 years ago)
From
Elisabetta Bissaldi at U.Innsbruk/IAPP <Elisabetta.Bissaldi@uibk.ac.at>
E. Bissaldi (Politecnico & INFN Bari)
reports on behalf of the Fermi GBM Team:
"At 06:18:45.66 UT on 9 November 2016, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 161109A (trigger 50036512 / 161109263),
which was also detected by the Fermi/LAT
(Desiante et al. 2008, GCN 20155).
The GBM on-ground location is consistent with the LAT position.
The angle from the Fermi LAT boresight at the GBM trigger time is 77 degrees.
The GBM light curve consists of three peaks
with a duration (T90) of about 24 s (50-300 keV).
The time-averaged spectrum from T0 to T0+30 s is
best fit by a Band function with Epeak = 250 +/- 16 keV,
alpha = -0.73 +/- 0.04, and beta = -2.06 +/- 0.06.
The event fluence (10-1000 keV) in this time interval is
(2.30 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+17 s in the 10-1000 keV band
is 16.7 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
GCN Circular 20158
Subject
GRB 161109A: Tiled Swift observations
Date
2016-11-09T17:34:17Z (9 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a series of observations, tiled on the sky, of the
Fermi/LAT GRB 161109A. Automated analysis of the XRT data will
be presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00060
Any uncatalogued X-ray sources detected in this analysis will be
reported on this website and via GCN COUNTERPART notices. The probability of finding
serendipitous sources, unrelated to the Fermi/LAT event is high: any X-ray source
considered to be a probable afterglow candidate will be reported via a GCN Circular
after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et
al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
GCN Circular 20164
Subject
GRB 161109A: Swift-XRT observations
Date
2016-11-10T08:00:39Z (9 years ago)
From
Antonino D'Ai at IASF-PA <antonino.dai@ifc.inaf.it>
S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U.
Leicester), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo
(INAF-OAB), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N.
Burrows (PSU) and P.A. Evans (U. Leicester) report on behalf of the
Swift-XRT team:
Swift-XRT has performed follow-up observations of the
Fermi/LAT-detected burst GRB 161109A (Desiante et al. GCN Circ. 20155)
in a series of observations tiled on the sky. The total exposure time
is 4.1 ks, distributed over 5 tiles; the maximum exposure at a single
sky location was 2.9 ks. The data were collected between T0+40.4 ks and
T0+63.6 ks, and are entirely in Photon Counting (PC) mode.
Three uncatalogued X-ray sources have been detected, however none of
them is above the RASS limit or shows definitive signs of fading.
Therefore, at the present time we cannot identify which, if any, is the
afterglow. Details of these sources are given below:
Source 2:
RA (J2000.0): 157.9051 = 10:31:37.24
Dec (J2000.0): +61.8845 = +61:53:04.4
Error: 3.7 arcsec (radius, 90% conf. [Enhanced position])
Count-rate: (6.1 [+3.2, -2.4])e-3 ct s^-1
Distance: 244 arcsec from Fermi/LAT position.
Source 5:
RA (J2000.0): 157.9726 = 10:31:53.43
Dec (J2000.0): +61.9393 = +61:56:21.6
Error: 6.4 arcsec (radius, 90% conf. [Enhanced position])
Count-rate: (6.6 [+2.6, -2.1])e-3 ct s^-1
Distance: 471 arcsec from Fermi/LAT position.
Source 6:
RA (J2000.0): 158.0653 = 10:32:15.66
Dec (J2000.0): +61.6754 = +61:40:31.5
Error: 6.9 arcsec (radius, 90% conf.)
Count-rate: (6.8 [+3.1, -2.4])e-3 ct s^-1
Distance: 635 arcsec from Fermi/LAT position.
Flux: (2.01 [+0.91, -0.70])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)
Three catalogued sources were also detected.
The results of the XRT-team automatic analysis of the tiled XRT
observations, including a position-specific upper limit calculator, are
available at http://www.swift.ac.uk/xrt_products/TILED_GRB00060.
This circular is an official product of the Swift-XRT team.
GCN Circular 20165
Subject
GRB 161109A: Lomonosov BDRG gamma ray discovery
Date
2016-11-10T14:42:02Z (9 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
N.L.Dzhioeva,V.V.Bogomolov, S.I.Svertilov,
A.M.Amelushkin, V.O.Barinova, M.I.Panasyuk, A.V.Bogomolov, A.F.Iyudin,
V.V.Kalegaev, D.Nguen, V.L. Petrov, I.V.Yashin, P.S.Kazarian
Physics Department, Skobel`tsyn Institute of Nuclear Physics, Lomonosov Moscow
State University
V. Lipunov, E.S. Gorbovskoy, N.Tyurina, D.Kuvshinov
Lomonosov Moscow State University, Sternberg Astronomical Institute
I. Park, J. Lee, S. Jeong
Department of Physics, Sungkyunkwan University, Seobu-ro, Jangangu, Suwonsi,
Korea
At 06:11:45 UT on 09 Nov 2016,
the Lomonosov BDRG Gamma-ray Burst Monitor
(http://lomonosov.sinp.msu.ru/en/scientific-equipment-2/bdrg),
triggered GRB 161109A.
GRB 161106A (R. Desiante (INFN Torino), GCN 20155),
total duration ~25s,
the energy range 35-300 keV.
LC is available at:
http://master.sai.msu.ru/static/OT/0911.jpg
More information will be available at:
http://lomonosov.sinp.msu.ru/category/results/observation-gamma-ray-bursts
This Notice was ground-generated.
The message may be cited.
GCN Circular 20169
Subject
GRB 161109A: Swift/UVOT Upper Limits
Date
2016-11-11T15:34:35Z (9 years ago)
From
Sam Emery at MSSL-UCL <samuel.emery.15@ucl.ac.uk>
S. W. K Emery (MSSL-UCL) and A. D'Ai (INAF-IASFPA) report on behalf
of the Swift/UVOT team:
Swift-UVOT performed follow-up observations of the Fermi/LAT-detected
burst GRB 161109A (Desiante et al. GCN Circ. 20155) in a series of
observations tiled on the sky. Observations were taken in the u band
filter between T0+40.4 ks and T0+63.3 ks after the Fermi trigger.
Swift/UVOT did not find any new optical counterpart. The 3 sigma
upper limits at the position of each of the uncatalogued X-ray sources (Gibson et
al. GCN Circ. 20164) are:
Source T_start (s) T_end (s) Exposure Time (s) filter 3s UL
Source 2 40425 57980 1152 u 20.11
Source 3 40425 57980 1152 u 20.08
Source 6 41245 63272 1121 u 19.22
The magnitudes in the table are 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).
GCN Circular 20171
Subject
GRB 161109A: CALET Gamma-Ray Burst Monitor detection
Date
2016-11-11T23:29:43Z (9 years ago)
From
Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>
I. Takahashi (IPMU), A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama, Y. Yamada (AGU),
K. Yamaoka (Nagoya U), S. Nakahira (JAXA), Y. Asaoka, S. Ozawa, S. Torii (Waseda U),
Y. Shimizu, T. Tamura (Kanagawa U), W. Ishizaki (ICRR), M. L. Cherry (LSU),
S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena)
and the CALET collaboration:
The long-duration GRB 161109A (Desiante et al., GCN Circ. 20155;
Bissaldi et al., GCN Circ. 20156; Konus-Wind trigger time on 6:18:43.284)
triggered the CALET Gamma-ray Burst Monitor (CGBM) at 6:18:40.56 on
9 November 2016. The burst signal was seen by all CGBM instruments.
The light curve of the SGM shows at least four peaks. The first three peaks
are rather weak, and they peak at T+5 sec, T+10 sec and T+15 sec, respectively.
The forth peak is the brightest, and it starts at T+20 sec, peaks at T+22 sec
and ends at T+32 sec. The T90 duration measured by the SGM data is
24.8 +- 2.3 sec (40-1000 keV).
The light curve is available at
http://yoshidalab.mydns.jp/cgbm_trigger/flight/1162707406/
The CALET data used in this analysis are provided by the Waseda
CALET Operation Center located at the Waseda University.