GRB 230207B
GCN Circular 33296
Subject
GRB 230207B: AGILE detection of a burst
Date
2023-02-07T11:50:36Z (2 years ago)
From
Claudio Casentini at INAF-IAPS <claudio.casentini@inaf.it>
C. Casentini (INAF/IAPS), F. Verrecchia (SSDC, and INAF/OAR), F. Longo
(Uni. Trieste, INFN Trieste), M. Tavani (INAF/IAPS, and Univ. Roma Tor
Vergata),
C. Pittori, F. Lucarelli (SSDC, and INAF/OAR), A. Argan, M. Cardillo, Y.
Evangelista,
L. Foffano, E. Menegoni, G. Piano (INAF/IAPS), A. Addis, L. Baroncelli, A.
Bulgarelli,
A. Di Piano, V. Fioretti, G. Panebianco, N. Parmiggiani (INAF/OAS-Bologna),
M. Romani (INAF/OA-Brera), M. Marisaldi (INAF/OAS-Bologna, Bergen
University),
M. Pilia, A. Trois (INAF/OA Cagliari), I. Donnarumma, A.Ursi (ASI), A.
Giuliani
(INAF/IASF-Mi) and P. Tempesta (TeleSpazio), report on behalf of the AGILE
Team:
The AGILE satellite detected the long GRB 220307B at
T0 = 2023-02-07 04:40:48 s (UTC) (CALET trig. 1359779945).
The burst is clearly visible in the AGILE scientific ratemeters of the
MiniCALorimeter (MCAL; 0.4-100 MeV) and in all the five panels of the
AntiCoincidence
system (AC Top, 50-200 keV; AC Lat, 80-200 keV). The event lasted about 14
s and it
released a total number of 15515 counts in the MCAL detector (above a
background rate of 996 Hz),
and 49298 counts in the AC Top detector (above a background rate of 2674
Hz).
The AGILE ratemeters light curves can be found at
http://www.agilescienceapp.it/notices/GRB230207B_AGILE_RM_ND.png .
The event also triggered a (partial) high-time resolution MCAL data
acquisition,
from T0-1 s to T0+5 s (UTC), and released 116 counts in the detector, above
a background rate of 67 Hz. The MCAL light curve can be found
at
http://www.agilescienceapp.it/notices/GRB230207B_082154_602829648.000000.png
.
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 33298
Subject
GRB 230207B: Swift/BAT-GUANO detection outside the coded FOV
Date
2023-02-07T17:30:03Z (2 years ago)
From
Aaron Tohuvavohu at U Toronto <aaron.tohu@gmail.com>
Gayathri Raman (PSU), Jamie A. Kennea (PSU), James DeLaunay
(UAlabama), Aaron Tohuvavohu (U Toronto) report:
Swift/BAT did not localize GRB 230207B onboard (T0:
2023-02-07T04:40:48 UTC, CALET trig 1359779945, INTEGRAL 10190, AGILE
GCN 33296)
The CALET and INTEGRAL notices, 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 2022, ApJ,
941, 169), detects the burst with a sqrt(TS) of 27.8 in a 8.192 s
analysis time bin.
The burst duration as seen by BAT is ~15 s.
NITRATES results indicate a burst coming from outside the FOV, with
DeltaLLHOut of -36.
See Section 9.1 and Figures 10 and 17 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 33303
Subject
GRB 230207B: Detection by GRBAlpha
Date
2023-02-08T14:52:24Z (2 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), N. Husarikova, F. Munz , M. Topinka, M. Kolar, J.-P.
Breuer, 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 Metropolitan U.), M. Moritaki (U.
Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.
The long-duration GRB 230207B (AGILE/MCAL detection: GCN Circ. 33296;
Swift/BAT-GUANO detection: GCN Circ. 33298; CALET/GCBM detection: trigger
no. 1359779945; INTEGRAL/SPI-ACS detection: trigger no. 10190) was observed
by the GRBAlpha 1U CubeSat (Pal et al. Proc. SPIE 2020).
The detection was confirmed at the peak time 2023-02-07 04:40:48 UTC. The
T90 duration measured by GRBAlpha is 10 s and the overall significance
during T90 reaches 25 sigma.
The light curve obtained by GRBAlpha is available here:
https://grbalpha.konkoly.hu/static/share/GRB230207B_GCN.pdf
All GRBAlpha detections are listed at:
https://monoceros.physics.muni.cz/hea/GRBAlpha/
GRBAlpha, launched on 2021 March 22, is a demonstration mission for a
future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector
of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI 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, the upgrade of the on-board
data acquisition software stack is in progress. 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 33342
Subject
GRB 230207B: CALET Gamma-Ray Burst Monitor detection
Date
2023-02-18T08:37:02Z (2 years ago)
From
Yuta Kawakubo at Louisiana State U./CALET <kawakubo1@lsu.edu>
S. Torii (Waseda U), A. Yoshida, T. Sakamoto, S. Sugita (AGU),
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN),
Y. Asaoka (ICRR), Y. Akaike, K. Kobayashi (Waseda U),
Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC),
M. L. Cherry (LSU), S. Ricciarini (U of Florence),
P. S. Marrocchesi (U of Siena),
and the CALET collaboration:
The long GRB 230207B (AGILE detection: Casentini et al.,
GCN Circ 33296; Swift-BAT-GUANO detection: Raman et al.,
GCN Circ. 33298; Detection by GRBAlpha: Dafcikova et al.,
GCN Circ. 33303) triggered the CALET Gamma-ray
Burst Monitor (CGBM) at 04:40:43.38 UTC on 7 February 2023
(http://cgbm.calet.jp/cgbm_trigger/flight/1359779945/index.html).
The burst signal was seen by all CGBM detectors.
The burst light curve shows a single pulse that starts
at T+2.1 sec, peaks at T+5.2 sec, and ends at T+28.2 sec.
The T90 and T50 durations measured by the SGM data are 14.2 +/- 0.8 sec
and 4.7 +/- 0.1 sec (40-1000 keV), respectively.
The ground-processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1359779945/
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.