GRB 230608A
GCN Circular 33946
Subject
GRB 230608A: AGILE detection
Date
2023-06-09T11:20:47Z (2 years ago)
From
Francesco Longo at U of Trieste,INFN Trieste <franzlongo1969@gmail.com>
F. Longo (Univ. Trieste and INFN Trieste), F. Verrecchia, C. Pittori
(SSDC, and INAF/OAR),
M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), C. Casentini (INAF/IAPS),
A. Ursi (ASI and INAF/IAPS), A. Argan, M. Cardillo, Y. Evangelista, L. Foffano,
G. Piano (INAF/IAPS), A. Addis, L. Baroncelli, A. Bulgarelli, G. Panebianco,
A. Di Piano, V. Fioretti, N. Parmiggiani (INAF/OAS-Bologna), F.
Lucarelli (SSDC, and INAF/OAR),
M. Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A.
Trois (INAF/OA-Cagliari),
I. Donnarumma, E. Menegoni (ASI), A. Giuliani (INAF/IASF-Mi), and P.
Tempesta (TeleSpazio)
report on behalf of the AGILE Team:
The AGILE satellite detected the GRB 230608A at T0 = 2023-06-08
18:34:36 s (UTC),
detected also by INTEGRAL SPI-ACS (trigger no.10282).
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 5 s and it released a total number
of 3966 counts in the MCAL detector (above a background rate of 532 Hz)
and 19256 counts in the AC-Top detector (above a background rate of 2875 Hz).
The AGILE ratemeters light curves can be found at
http://www.agilescienceapp.it/notices/GRB230608A_AGILE_RM_ND.png
Additional analysis of AGILE data is in progress.
GCN Circular 33947
Subject
GRB 230608A: AstroSat CZTI detection
Date
2023-06-09T12:20:14Z (2 years ago)
From
Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>
P K. Navaneeth (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 ML pipeline (Abraham et al., 2021, MNRAS, 504, 3084) and the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a bright GRB 230608A which was also detected by CALET (ID Num. 1370284460), INTEGRAL SPI-ACS (Trig Num. 10282), and AGILE (Longo et al., GCN Circ. 33946).
The source was clearly detected in the 20-200 keV energy range. The light curve peaks at 2023-06-08 18:34:37.50 UTC. The measured peak count rate associated with the burst is 724 (+54, -54) counts/s above the background in the combined data of three quadrants (out of four), with a total of 3349 (+393, -345) counts. The local mean background count rate was 358 (+2, -3) counts/s. Using cumulative rates, we measure a T90 of 16 (+8, -8) s.
The source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2023-06-08 18:34:37.50 UTC. The measured peak count rate associated with the burst is 1210 (+85, -95) counts/s above the background in the combined data of all quadrants, with a total of 4297 (+722, -809) counts. The local mean background count rate was 1573 (+6, -7) counts/s. We measure a T90 of 7 (+7, -3) s from the cumulative Veto light curve.
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.
CZTI GRB detections are reported regularly on the payload site at:
http://astrosat.iucaa.in/czti/?q=grb
GCN Circular 33948
Subject
GRB 230608A: CALET Gamma-Ray Burst Monitor detection
Date
2023-06-10T04:09:51Z (2 years ago)
From
Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>
K. Yamaoka (Nagoya U), A. Yoshida, T. Sakamoto,
S. Sugita (AGU), Y. Kawakubo (LSU),
S. Nakahira (JAXA), Y. Asaoka (ICRR),
S. Torii, 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 230608A (INTEGRAL SPI ACS Trigger #10282;
AGILE detection: Longo et al., GCN Circ 33946; AstroSat CZTI
detection: Navaneeth et al., GCN Circ 33947) triggered the
CALET Gamma-ray Burst Monitor (CGBM) at 18:34:33.392 UTC
on 8 June 2023
(http://cgbm.calet.jp/cgbm_trigger/flight/1370284460/index.html).
The burst signal was seen by only the SGM detector.
The burst light curve shows a single pulse that starts
at T+2.5 sec, peaks at T+3.3 sec, and ends at T+7.0 sec.
The T90 and T50 durations measured by the SGM data are
3.9 +/- 0.4 sec and 1.6 +/- 0.4 sec (40-1000 keV), respectively.
The ground-processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1370284460/
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.