GRB 190117A
GCN Circular 23792
Subject
GRB 190117A: AstroSat CZTI detection
Date
2019-01-25T03:59:06Z (7 years ago)
From
Tanazza Khanam at IUCAA <tanazza@iucaa.in>
T. Khanam, V. Sharma, D. Bhattacharya and A. Vibhute (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data showed the detection of a long GRB 190117A, which was also detected by AGILE (MCAL; Ursi, et al., GCN Circ. 23752), Insight (HXMT/HE; Xiao et al., GCN Circ. 23759), Konus-Wind, INTEGRAL (Frederiks D. et al., GCN Circ 23782), IPN Triangulation (Hurley K. et al., GCN Circ. 23764) and Swift (BAT).
The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 14:36:49.5 UT. The measured peak count rate is 2356 cts/s above the background in combined data of four quadrants, with a total of 11729 cts. The local mean background count rate was 524 cts/s. Using cumulative rates, we measure a T90 of 22.75 s. In preliminary analysis, we find that 862 Compton events are associated with this event.
It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.
CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.
GCN Circular 23782
Subject
Konus-Wind of observation of GRB 190117A
Date
2019-01-24T14:12:03Z (7 years ago)
From
Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>
D. Frederiks, S. Golenetskii, R.Aptekar, A. Kozlova,
A.Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline,
on behalf of the Konus-Wind team, report:
The long GRB 190117A (Agile/MCAL detection: Ursi et al., GCN 23752;
Insight-HXMT/HE detection: Xiao et al., GCN 23759,
IPN triangulation: Hurley et al., GCN 23764)
triggered Konus-Wind (KW) at T0=52611.684 s UT (14:36:51.684).
The burst light curve shows a weak emission pulse at ~T0-10 s and
three bright pulses in the interval from ~T0 to ~T0+30 s.
A total duration of the burst (T100) is ~36.3 s.
The emission is seen up to ~15 MeV.
As observed by Konus-Wind, the burst had a fluence of
(4.1 �� 0.3)x10^-5 erg/cm2 and a 64-ms peak energy flux,
measured from T0+1.984, of (1.66 �� 0.13)x10^-5 erg/cm2
(both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum (measured from T0 to T0+33.024 s)
is best fit in the 20 keV - 15 MeV range
by the GRB (Band) function with the following model parameters:
the low-energy photon index alpha = -1.19 (-0.08,+0.07),
the high energy photon index beta = -2.67 (-0.60,+0.27),
the peak energy Ep = 190 (-17,+18) keV
(chi2 = 90/97 dof).
The spectrum near the peak count rate (measured from T0
to T0+8.448 s) is best fit in the 20 keV - 15 MeV range
by the GRB (Band) function with the following model parameters:
alpha = -1.04 (-0.08,+0.07),
beta = -2.68 (-0.44,+0.23),
Ep = 208 (-18,+20) keV
(chi2 = 74/97 dof).
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB190117_T52611/
All the quoted errors are estimated at the 68% confidence level.
All the presented results are preliminary.
GCN Circular 23764
Subject
IPN Triangulation of GRB 190117A (long)
Date
2019-01-21T16:44:34Z (7 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
K. Hurley, on behalf of the IPN,
I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin,
on behalf of the HEND-Odyssey GRB team,
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Kozlova
and T. Cline on behalf of the Konus-Wind team,
A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo,
and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
S. Barthelmy, J. Cummings, H. Krimm, and D. Palmer,
on behalf of the Swift-BAT team,
S. Xiao, C. K. Li, X. B. Li, Y. Huang, and S. L. Xiong
on behalf of the Insight-HXMT GRB team,
and
W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr,
on behalf of the GRS-Odyssey GRB team, report:
The long-duration GRB 190117A was detected by
AGILE (MCAL; Ursi, et al., GCN Circ. 23752),
Insight (HXMT/HE; Xiao et al., GCN Circ. 23759),
Konus-Wind, INTEGRAL (SPI-ACS), and Swift (BAT),
at about 52607 s UT (14:36:47).
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:
113.864 (07h 35m 27s) +6.519 ( +6d 31' 10")
Corners:
113.942 (07h 35m 46s) +8.247 ( +8d 14' 49")
113.615 (07h 34m 28s) +5.249 ( +5d 14' 56")
113.807 (07h 35m 14s) +4.881 ( +4d 52' 52")
114.126 (07h 36m 30s) +7.833 ( +7d 49' 58")
---------------------------------------------
The error box area is about 2453 sq. arcmin, and its maximum
dimension is 3.369 deg (the minimum one is 13.68 arcmin).
The Sun distance was about 163 deg.
This box may be improved.
A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB190117_T52611/IPN
The Konus-Wind time history and spectrum will be given in a forthcoming
GCN Circular.
GCN Circular 23759
Subject
GRB 190117A: Insight-HXMT/HE detection
Date
2019-01-19T09:26:21Z (7 years ago)
From
Shuo Xiao at IHEP <xiaoshuo@ihep.ac.cn>
S. Xiao, C. K. Li, X. B. Li, G. Li, J. Y. Liao, S. L. Xiong,
C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, X. F. Lu, J. L. Zhao,
A. M. Zhang, Y. F. Zhang, C. L. Zou (IHEP), Y. J. Jin,
Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song,
M. Wu, Y. P. Xu, S. N. Zhang (IHEP),
report on behalf of the Insight-HXMT team:
At 2019-01-17T14:36:47.000 (T0), the Insight-HXMT/HE detected
GRB 190117A (trigger ID: HEB190117608) in a routine search of the data,
which was also triggered by Konus-Wind and INTEGRAL/SPI-ACS.
The Insight-HXMT/HE light curve mainly consists of multiple
pulses with a duration (T90) of 23.29 s measured from T0+0.13 s.
The 1-s peak rate, measured from T0+1.97 s, is 5013.1 cnts/s.
The total counts from this burst is 21613.5 counts.
URL_LC: http://www.hxmt.org/images/GRB/HEB190117608_lc.jpg
All measurements above are made with the CsI detectors operating in the
regular mode with the energy range of about 80-800 keV (record energy).
Only gamma-rays with energy greater than about 200 keV can penetrate
the spacecraft and leave signals in the CsI detectors installed inside
of the telescope.
Insight-HXMT is the first Chinese space X-ray telescope, which was
funded jointly by the China National Space Administration (CNSA) and
the Chinese Academy of Sciences (CAS).
More information could be found at: http://www.hxmt.org.
GCN Circular 23752
Subject
GRB 190117A: AGILE/MCAL detection of a burst
Date
2019-01-17T19:01:06Z (7 years ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
A.Ursi (INAF/IAPS), C. Pittori (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS,
and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C. Casentini, Y.
Evangelista, G. Piano (INAF/IAPS), F. Lucarelli, F. Verrecchia (SSDC, and
INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani
(INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University),
M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ.
Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of
the AGILE Team:
The AGILE Mini-CALorimeter (MCAL) detected a burst at T0 = 2019-01-17
14:36:49.01 +/- 0.01 s (UTC).
In the 0.4-100 MeV energy range, the event lasted about 0.6 s and released
a total number of ~530 counts in the detector, above an average background
rate of 540 counts / s.
The GRB is clearly detected also by the AGILE scientific ratemeters: in
particular, by the Super-AGILE (20-60 keV), Anti-Coincidence (50-200 keV),
and MCAL (0.4-100 MeV) ratemeters.
Further analysis is still in progress.
The AGILE-MCAL detector has a full solid angle acceptance, and is
operational in the range 0.4 - 100 MeV.