GRBweb by P. Coppin

This page lists all entries on GRB230625B in GRBweb

Summary GCN 34084 GCN 34119 GCN 34123 GCN 34126

Summary table
Variable	Value	Source
T0	7:28:45 UTC	GCN_circulars,IPN Triangulation
ra	348.0470°	GCN_circulars,IPN Triangulation
decl	27.3850°	GCN_circulars,IPN Triangulation
GBM_located	False
mjd	60120.311631944445	GCN_circulars,IPN Triangulation

GCN 34084 table
GRB_name	GRB230625B
GCN_number	34084
Detection_method	Swift Other
Circular_text	TITLE: GCN CIRCULAR NUMBER: 34084 SUBJECT: GRB 230625B: Swift/BAT-GUANO detection of a long burst DATE: 23/06/26 23:54:39 GMT FROM: Samuele Ronchini at PSU Samuele Ronchini (PSU), James DeLaunay (U Alabama), Aaron Tohuvavohu (U Toronto), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report: Swift/BAT did not localize GRB 230625B onboard (T0: 2023-06-25T07:28:45.61 UTC, CALET trig. 1371713313). The CALET 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 2022, ApJ, 941, 169), performed on the temporal window [T0-20 s, T0+20 s] , detects the burst with a sqrt(TS) of 10.93 in a 16.384 s analysis time bin, starting at T0+4.096 s. NITRATES results, independently, are ambiguous with respect to whether this burst originates from inside or outside the BAT coded FOV, with a DeltaLLHOut of 12.81 and DeltaLLHPeak of 2.84. 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 34119 table
GRB_name	GRB230625B
GCN_number	34119
Detection_method	AstroSat CZTI
Circular_text	TITLE: GCN CIRCULAR NUMBER: 34119 SUBJECT: GRB 230625B: AstroSat CZTI detection DATE: 23/06/29 09:19:30 GMT FROM: Gaurav Waratkar at IIT Bombay 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 CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a GRB 230625B which was also detected by CALET (Trig. 1371713313) and Swift/BAT-GUANO (Ronchini et al., GCN Circ. 34084). The source was clearly detected in the 20-200 keV energy range. The light curve peaks at 2023-06-25 07:28:57.50 UTC. The measured peak count rate associated with the burst is 279 (+55, -14) counts/s above the background in the combined data of all quadrants, with a total of 9279 (+893, -648) counts. The local mean background count rate was 504 (+3, -5) counts/s. Using cumulative rates, we measure a T90 of 65 (+3, -4) 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 2023-06-25 07:28:57.50 UTC. The measured peak count rate associated with the burst is 266 (+80, -19) counts/s above the background in the combined data of all quadrants, with a total of 7354 (+1143, -1181) counts. The local mean background count rate was 1607 (+5, -6) counts/s. We measure a T90 of 70 (+3, -15) s from the cumulative Veto light curve. We further report the detection of 2 more bright bursts, with multiple peaks, about 50 s after the first burst reported above had ended. Preliminary analysis shows that these subsequent emission bursts had similar signatures to GRB 230625B and lasted for about 200 s, after which AstroSat entered the South Atlantic Anomaly (SAA) region. We caution that since AstroSat was close to SAA, these bursts may not be related to GRB 230625B. 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 34123 table
GRB_name	GRB230625B
GCN_number	34123
Detection_method	CALET
Circular_text	TITLE: GCN CIRCULAR NUMBER: 34123 SUBJECT: GRB 230625B: CALET Gamma-Ray Burst Monitor detection DATE: 23/06/30 04:09:47 GMT FROM: Yuta Kawakubo at Louisiana State University Y. Asaoka (ICRR), A. Yoshida, T. Sakamoto, S. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), 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 230625B (Swift/BAT-GUANO Detection: Ronchini et al., GCN Circ. 34083; AstroSat CZTI detection: Navaneeth et al., GCN Circ. 34119) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 07:28:45.62 UTC on 25 June 2023 (http://cgbm.calet.jp/cgbm_trigger/flight/1371713313/index.html). The burst signal was seen by all CGBM detectors. The burst light curve shows multi-peaked structure that starts at T-2.0 sec. The whole episode was not seen by CGBM because the sequence of the HV turn-off started from T+220 sec. The ground-processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1371713313/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at Waseda University.

GCN 34126 table
GRB_name	GRB230625B
GCN_number	34126
Detection_method	IPN Triangulation
t_trigger	7:28:45 UTC
ra	348.0470°
decl	27.3850°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 34126 SUBJECT: IPN triangulation of GRB 230625B (ultra-long) DATE: 23/06/30 23:54:32 GMT FROM: Dmitry Svinkin at Ioffe Institute A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the HEND/Mars Odyssey team, D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team, E. Burns on behalf of the IPN, and W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr, and A.S. Gardner on on behalf of the GRS-Odyssey GRB team, report: The ultra-long GRB 230625B (Swift-BAT/GUANO detection: Ronchini et al., GCN Circ. 34084; AstroSat-CZTI detection: Navaneeth et al., GCN Circ. 34119; CALET-GBM detection: Asaoka et al., GCN Circ. 34123) was detected by Konus-Wind, INTEGRAL (SPI-ACS), AstroSat (CZTI), CALET (GBM triggers 1371713313 and 1371714158), Swift (BAT), and Mars-Odyssey (HEND) at about 26925 s UT (07:28:45). The burst was outside the coded field of view of the BAT. As observed by Konus-Wind, the burst light curve shows a multi-peaked structure with the total duration of ~1100 s. We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: ------------------------------ RA(2000), deg Dec(2000), deg ------------------------------ Center: 348.047 +27.385 Corners: 359.451 +18.898 359.209 +18.406 324.407 +33.245 323.504 +33.777 ------------------------------- The error box area is 18.4 sq. deg, and its maximum dimension is 35.3 deg (the minimum one is 31.4 arcmin). The Sun distance was about 86 deg. This box may be improved. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB230625_T26937/IPN The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB230625_T26937 A detailed analysis of the Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.