GRB 221022B
GCN Circular 32820
Subject
GRB 221022B: Fermi GBM Final Real-time Localization
Date
2022-10-22T23:05:54Z (3 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 22:55:48 UT on 22 Oct 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 221022B (trigger 688172153.911872 / 221022955).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 167.4, Dec = 15.4 (J2000 degrees, equivalent to J2000 11h 09m, 15d 24'), with a statistical uncertainty of 1.8 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/2022/bn221022955/quicklook/glg_skymap_all_bn221022955.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221022955/quicklook/glg_healpix_all_bn221022955.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221022955/quicklook/glg_lc_medres34_bn221022955.gif
GCN Circular 32822
Subject
GRB 221022B: AGILE detection
Date
2022-10-23T08:27:48Z (3 years ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
C. Casentini, A. Ursi (INAF/IAPS), F. Verrecchia (SSDC, and INAF/OAR), M.
Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), C. Pittori (SSDC, and
INAF/OAR), A. Argan, M. Cardillo, Y. Evangelista, L. Foffano, E. Menegoni,
G. Piano (INAF/IAPS), F. Lucarelli (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 satellite detected the GRB 221022B at T0 = 2022-10-22 22:56:11.76
+/- 0.01 s (UTC), reported by Fermi GBM (#GCN 32820, trigger no. 688172153).
The burst is clearly visible in the AGILE scientific ratemeters of the
MiniCALorimeter (MCAL; 0.4-100 MeV), and AntiCoincidence (AC; 50-200 keV)
detectors. The event lasted about 15 s and it released a total number of
27380 counts in the MCAL detector (above a background rate of 1070 Hz), and
80780 counts in the AC detector (above a background rate of 2760 Hz). The
AGILE ratemeter light curves can be found at
http://www.agilescienceapp.it/notices/GRB221022B_AGILE_RM.png .
The event also triggered a partial high time resolution MCAL data
acquisition, covering the onset of the first episode, from T0-33.15 s to
T0+1.70 s, and released a total number of ~830 counts in the detector,
above an average background rate of 588 Hz. The MCAL light curve can be
found at
http://www.agilescienceapp.it/notices/080607_GRB_MCAL_593564171.767936.png .
The AGILE-MCAL detector is a CsI detector with a 4 pi FoV, sensitive in the
energy range 0.4-100 MeV. Additional analysis of AGILE data is in progress.
Automatic MCAL GRB alert Notices can be found at:
https://gcn.gsfc.nasa.gov/agile_mcal.html.
GCN Circular 32823
Subject
GRB 221022B: Swift/BAT-GUANO detection outside the coded FOV
Date
2022-10-24T00:22:00Z (3 years ago)
From
Aaron Tohuvavohu at U Toronto <aaron.tohu@gmail.com>
Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), James DeLaunay
(UAlabama), Jamie A. Kennea (PSU), Tyler Parsotan (GSFC/UMBC) report:
Swift/BAT did not localize GRB 221022B onboard (T0:
2022-10-22T22:55:48 UTC, Fermi/GBM GCN 32820, AGILE GCN 32822).
The Fermi notice, distributed in near real-time, triggered the Swift
Mission Operations Center operated Gamma-ray Urgent Archiver for Novel
Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).
Upon trigger by this notice, GUANO sent a command to the Swift Burst
Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from
[-50,+150] seconds around the time of the burst. All the requested
event mode data was delivered to the ground.
The BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu,
arXiv:2111.01769), detects the burst with a sqrt(TS) of 44.9 in a
16.384 s analysis time bin.
NITRATES results are consistent with a burst coming from outside the
FOV, with DeltaLLHOut of -17. The best fit sky location is consistent
with the Fermi/GBM position (GCN 32820).
See Section 9.1 and Figure 20 in the NITRATES paper for brief
descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and
DeltaLLHOut.
GUANO is a fully autonomous, extremely low latency, spacecraft
commanding pipeline designed for targeted recovery of BAT event mode
data around the times of compelling astrophysical events to enable
more sensitive GRB searches.
A live reporting of Swift/BAT event data recovered by GUANO can be
found at: https://www.swift.psu.edu/guano/
GCN Circular 32830
Subject
GRB 221022B: Fermi GBM detection
Date
2022-10-24T17:28:04Z (3 years ago)
From
Suraj Poolakkil at UAH <sp0076@uah.edu>
S. Poolakkil (UAH) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 22:55:48.91 UT on 22 October 2022, the Fermi Gamma-Ray Burst Monitor
(GBM)
triggered and located GRB 221022B (trigger 688172153 / 221022955, GCN 32820)
which was also detected by the Swift/BAT- GUANO (Raman et al. 2022, GCN
32823).
The angle from the Fermi LAT boresight at the GBM trigger time is 93
degrees.
The GBM light curve consists of a single peak followed
by some extended emission with a duration (T90) of about 32 s (50-300 keV).
The time-averaged spectrum from T0+7.17 s to T+46.08 s
is best fit by Band function, with Epeak = 265 +/- 6 keV,
alpha = -0.61 +/- 0.02 and beta = -2.61 +/- 0.10.
The event fluence (10-1000 keV) in this time interval is
(7.14 +/- 0.07)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+22.3 s in the 10-1000 keV band
is 34.3 +/- 0.5 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 32837
Subject
GRB 221022B: AstroSat CZTI detection
Date
2022-10-25T01:57:14Z (3 years ago)
From
Gaurav Waratkar at IIT,Bombay <gauravwaratkar@iitb.ac.in>
R. Gopalakrishnan (IUCAA), V. Prasad (IUCAA), G. Waratkar (IITB), A.
Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka
University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report
on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al.,
2021, JApA, 42, 73) showed the detection of a long GRB 221022B which was
also detected by Fermi GBM (GCN 32820), AGILE (Casentini et al., GCN
32822) and Swift/BAT-GUANO (Gayathri et al., GCN 32823).
The source was clearly detected in the 20-200 keV energy range. The
light curve peaks at 2022-10-22 22:56:11.50 UTC. The measured peak count
rate associated with the burst is 1613 (+72, -78) counts/s above the
background in the combined data of all quadrants, with a total of 14862
(+774, -850) counts. The local mean background count rate was 494 (+2,
-3) counts/s. Using cumulative rates, we measure a T90 of 31 (+5, -4) s.
It was also clearly detected in the CsI anticoincidence (Veto) detector
in the 100-500 keV energy range. The light curve peaks at 2022-10-22
22:56:10.86 UTC. The measured peak count rate is 2187 (+97, -105)
counts/s above the background in the combined Veto data of all
quadrants, with a total of 18217 (+1046, -1027) counts. The local mean
background count rate was 1575 (+3, -4) counts/s. We measure a T90 of 27
(+4, -6) 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, URSC, IUCAA, SAC,
and PRL. The Indian Space Research Organisation funded, managed, and
facilitated the project.
GCN Circular 32842
Subject
IPN triangulation of GRB 221022B (long)
Date
2022-10-25T11:38:41Z (3 years ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
A. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko,
and T. Cline on behalf of the Konus-Wind team,
A. Goldstein, M. S. Briggs, and C. Wilson-Hodge
on behalf of the Fermi GBM team,
E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
and
S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu
on behalf of the Swift-BAT team, report:
The long-duration GRB 221022B
(Fermi/GBM detection: Fermi GBM team, GCN 32820;
Poolakkil & Meegan, GCN 32830;
AGILE detection: Casentini et al., GCN 32822;
Swift/BAT-GUANO detection: Raman et al., GCN 32823;
AstroSat CZTI detection: Gopalakrishnan et al., GCN 32837)
has been detected by Fermi (GBM), INTEGRAL (SPI-ACS),
Konus-Wind, AGILE (MCAL, AC), AstroSat (CZTI) and
Swift (BAT), so far, at about 82549 s UT (22:55:49).
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:
170.477 (11h 21m 55s) +18.413 (+18d 24' 46")
Corners:
179.823 (11h 59m 18s) +26.613 (+26d 36' 46")
161.965 (10h 47m 52s) +10.411 (+10d 24' 38")
164.336 (10h 57m 21s) +9.908 ( +9d 54' 28")
183.830 (12h 15m 19s) +26.171 (+26d 10' 14")
---------------------------------------------
The error box area is 52.5 sq. deg, and its maximum
dimension is 26.0 deg (the minimum one is 2.2 deg).
The Sun distance was 43 deg.
This box may be improved.
The IPN localization is consistent with, but reduces the area of, the
Fermi-GBM final localization (GCN 32820).
A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB221022_T82557/IPN
The Konus-Wind time history and spectrum will be given
in a forthcoming GCN Circular.
GCN Circular 32844
Subject
GRB 221022B: Detection by GRBAlpha
Date
2022-10-25T12:53:55Z (3 years ago)
From
Marianna Dafcikova at Masaryk University <500025@mail.muni.cz>
M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), F. Munz, N. Husarikova, J.-P. Breuer, M. Topinka, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropo
litan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.
The long-duration GRB 221022B (Fermi/GBM detection: GCN Circ. 32820; AGILE/MCAL detection: Casentini et al., GCN Circ. 32822; Swift/BAT detection: Raman et al., GCN Circ. 32823; ASTROSAT/CZTI detection: Gopalakrishnan et al. GCN Circ. 32837; Konus/Wind trigger at 2022-10-22 22:55:57 UT; INTEGRAL/SPI-ACS detection at 2022-10-22 22:56:13 UT) was detected by the GRBAlpha 1U CubeSat (Pal et al. Proc. SPIE 2020).
The 23 sigma detection was confirmed at the peak time 2022-10-22 22:56:11.8 UTC. The GRB has a T90 duration of 32 s.
The light curve obtained by GRBAlpha is available here:
https://grbalpha.konkoly.hu/static/share/GRB221022B_GCN.pdf
GRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). Its detector consists of a 75 x 75 x 5 mm^3 CsI(Tl) scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, we are continuously upgrading the on-board data acquisition software stack. The ground segment is also supported by the radio amateur community, and it takes advantage of the SatNOGS network for increased data downlink volume.
GCN Circular 32864
Subject
Konus-Wind detection of GRB 221022B
Date
2022-10-27T12:40:54Z (3 years ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
A.Ridnaia, D. Frederiks, A.Lysenko, D. Svinkin,
A. Tsvetkova, M. Ulanov, and T. Cline,
on behalf of the Konus-Wind team, report:
The long-duration GRB 221022B
(Fermi/GBM detection: Fermi GBM team, GCN 32820;
Poolakkil & Meegan, GCN 32830;
AGILE detection: Casentini et al., GCN 32822;
Swift/BAT-GUANO detection: Raman et al., GCN 32823;
AstroSat CZTI detection: Gopalakrishnan et al., GCN 32837;
IPN triangulation: Ridnaia et al., GCN 32842;
GRBAlpha detection: Dafcikova et al., GCN 32844)
triggered Konus-Wind at T0=82557.097 s UT (22:55:57.097).
The burst light curve shows a multipeaked structure
which starts at ~T0-12.1 s and has a total duration of ~51.9 s.
The emission is seen up to ~4 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB221022_T82557/
As observed by Konus-Wind, the burst
had a fluence of 8.19(-0.62,+0.67)x10^-5 erg/cm2,
and a 64-ms peak flux, measured from T0+11.984 s,
of 1.57(-0.24,+0.24)x10^-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst
(measured from T0+8.448 to T0+43.776 s)
is best fit in the 20 keV - 10 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -0.68(-0.11,+0.12),
the high energy photon index beta = -2.69(-0.42,+0.23),
the peak energy Ep = 268(-21,+23) keV
(chi2 = 114/98 dof).
The spectrum near the maximum count rate
(measured from T0+8.448 to T0+12.800 s)
is best fit in the 20 keV - 10 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -0.30(-0.13,+0.15),
the high energy photon index beta = -2.60(-0.24,+0.17),
the peak energy Ep = 299(-24,+27) keV
(chi2 = 104/78 dof).
All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.