GRB 201016A
GCN Circular 28636
Subject
GRB 201016A: Fermi GBM Final Real-time Localization
Date
2020-10-16T00:38:14Z (5 years ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
The Fermi GBM team reports the detection of a likely LONG GRB
At 00:27:49 UT on 16 Oct 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 201016A (trigger 624500874.592646 / 201016019).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 174.3, Dec = -2.0 (J2000 degrees, equivalent to J2000 11h 37m, -2d 00'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 93.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201016019/quicklook/glg_skymap_all_bn201016019.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201016019/quicklook/glg_healpix_all_bn201016019.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201016019/quicklook/glg_lc_medres34_bn201016019.gif
GCN Circular 28641
Subject
GRB 201016A: BALROG localization (Fermi Trigger 624500874 / GRB 201016019)
Date
2020-10-16T03:30:21Z (5 years ago)
From
Jochen Greiner at MPE,Garching <jcg@mpe.mpg.de>
B. Biltzinger, F. Kunzweiler, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
624500874 at 00:27:49 on 16 Oct. 2020 were automatically fitted for spectrum
and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;
Berlato et al. 2019, ApJ 873, 60).
The best-fit position (1 sigma statistical errors) is:
RA(2000.0) = 176.6+/-0.1 deg
Decl.(2000.0) = -4.3+/-0.2 deg
We estimate an additional systematic error of 1 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB201016019/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB201016019/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB201016019/json
GCN Circular 28646
Subject
GRB 201016A: Fermi GBM detection
Date
2020-10-16T05:23:45Z (5 years ago)
From
Joshua Wood at MSFC/Fermi-GBM <joshua.r.wood@nasa.gov>
J. Wood (NASA/MSFC) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 00:27:49.59 UT on 16 October 2020, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 201016A (trigger 624500874 / 201016019).
The on-ground calculated location, using the GBM trigger data,
is RA = 174.3, DEC = -2.0 (J2000 degrees, equivalent
to 11h 37m, -2d 00'), with an uncertainty of 1.0 degrees
(radius, 1-sigma containment, statistical only; there is additionally a
systematic error which we have characterized as a mixture of two Gaussians,
one with a radius of 1.8 degrees (52% contribution) and one with a radius
of 4.1 degrees (47% contribution) [A. Goldstein et al. 2020, ApJ, 895, 1] ).
The angle from the Fermi LAT boresight at the GBM trigger time is 93 degrees.
The GBM light curve consists of multiple pulses with a duration (T90)
of about 3 s (50-300 keV). The time-averaged spectrum from
T0+6.3 s to T0+9.4 s is best fit by a Band function with Epeak = 181 +/- 2 keV,
alpha = -0.42 +/- 0.01, and beta = -2.75 +/- 0.03
The event fluence (10-1000 keV) in this time interval is
(9.06 +/- 0.04)E-05 erg/cm^2. The 1.024-sec peak photon flux measured
starting from T0+6.8 s in the 10-1000 keV band
is 267.4 +/- 1.1 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:
https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support
Page:
https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular 28651
Subject
GRB 201016A: AstroSat CZTI detection
Date
2020-10-16T11:27:57Z (5 years ago)
From
Soumya Gupta at IUCAA/ASTROSAT <soumya@iucaa>
S. Gupta, V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (IUCAA/TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data showed detection of a bright long GRB 201016A, which was also detected by Fermi GBM Final Real-time (GCN #28636), BALROG (Biltzinger B. et al., GCN #28641) and Fermi GBM (Wood J. et al., GCN #28646).
The source was clearly detected in the 40-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2020-10-16 00:27:56.500 UT. The measured peak count rate associated with the burst is 4218 +/- 68 cts/s above the background in the combined data of four quadrants, with a total of 8601 +/- 8 cts. The local mean background count rate was 488 +/- 1 cts/s. Using cumulative rates, we measure a T90 of 2.91 +/- 0.01 s.
It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2020-10-16 00:27:56.000 UT. The measured peak count rate is 6766 +/- 89 cts/s above the background in the combined Veto data of four quadrants, with a total of 14638 +/- 12 cts. The local mean background count rate was 1422 +/- 1 cts/s. We measure a T90 of 3.05 +/- 0.01 s from the cumulative Veto light curve.
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 28694
Subject
GRB 201016A: Insight-HXMT/HE detection
Date
2020-10-20T00:41:34Z (5 years ago)
From
Ce Cai at IHEP <caice@ihep.ac.cn>
C. Cai, C. Zheng, J. C. Liu, Q. Luo, S. Xiao,
W. C. Xue, Q. B. Yi, Y. Q. Zhang, Y. Huang, C. K. Li,
G. Li, X. B. Li, J. Y. Liao, X. Y. Song, S. L. Xiong, C. Z. Liu,
X. F. Li, Z. W. Li, Z. Chang, A. M. Zhang, Y. F. Zhang,
X. F. Lu, 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 2020-10-16T00:27:49.500 (T0), Insight-HXMT/HE detected
GRB 201016A (trigger ID: HEB201016019) in a routine search of the data,
which also triggered Fermi/GBM (Wood J. et al., GCN #28646) and
AstroSat/CZTI (Gupta S. et al., GCN #28651).
The Insight-HXMT/HE light curve mainly consists of multiple
pulses with a duration (T90) of 3.36 s measured from T0+6.06 s.
The 1-ms peak rate, measured from T0+7.47 s, is 20372 cnts/sec.
The total counts from this burst is 57956 counts.
URL_LC: http://twiki.ihep.ac.cn/pub/HXMT/GRBList/HEB201016019_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 (deposited 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 about it could be found at:
http://www.hxmt.org.