GRB231123B

This page lists all entries on GRB231123B in GRBweb

Summary Fermi GBM GCN 35170 GCN 35195 GCN 35204

Summary table
Variable Value Source
GRB_name_Fermi GRB231123809
T0 19:25:20.738 UTC Fermi_GBM
ra 163.2400° Fermi_GBM
decl -67.5500° Fermi_GBM
pos_error 5.65e+00° Fermi_GBM
T90 52.481 s Fermi_GBM
T90_error 2.862 s Fermi_GBM
T90_start 19:25:20.738 UTC Fermi_GBM
fluence 2.21e-06 erg/cm² Fermi_GBM
fluence_error 5.13e-08 erg/cm² Fermi_GBM
T100 52.481 s
GBM_located True
mjd 60271.80926780093 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB231123809
trigger_name bn231123809
ra 163.2400°
decl -67.5500°
pos_error 5.65e+00°
datum 2023-11-23
t_trigger 19:25:21.506 UTC
T90 52.481 s
T90_error 2.862 s
T90_start 19:25:20.738 UTC
fluence 2.21e-06 erg/cm²
fluence_error 5.13e-08 erg/cm²
flux_1024 1.45e+00 erg/cm²/s
flux_1024_error 2.22e-01 erg/cm²/s
flux_1024_time 2.06e+01 erg/cm²/s
flux_64 4.56e+00 erg/cm²/s
flux_64_error 1.46e+00 erg/cm²/s
GCN 35170 table
GRB_name GRB231123B
GCN_number 35170
Detection_method Fermi GBM final loc
t_trigger 19:25:21 UTC
ra 160.4000°
decl -68.9000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 35170 SUBJECT: GRB 231123B: Fermi GBM Final Real-time Localization DATE: 23/11/23 19:35:41 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 19:25:21 UT on 23 Nov 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231123B (trigger 722460326.50637 / 231123809). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 160.4, Dec = -68.9 (J2000 degrees, equivalent to J2000 10h 41m, -68d 54'), with a statistical uncertainty of 6.1 degrees. The angle from the Fermi LAT boresight is 104.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231123809/quicklook/glg_skymap_all_bn231123809.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231123809/quicklook/glg_healpix_all_bn231123809.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231123809/quicklook/glg_lc_medres34_bn231123809.gif
GCN 35195 table
GRB_name GRB231123B
GCN_number 35195
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 35195 SUBJECT: GRB 231123B: Swift/BAT-GUANO detection of a burst outside the coded FOV DATE: 23/11/26 19:43:19 GMT FROM: Jimmy DeLaunay at University of Alabama James DeLaunay (PSU), Aaron Tohuvavohu (U Toronto), Samuele Ronchini (PSU), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report: Swift/BAT did not localize GRB 231123B onboard (T0: 2023-11-23T19:25:21.51 UTC, Fermi trig 722460326) 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 90 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 8.8 in a 8.192 s analysis time bin, starting at T0 - 4.096 s. NITRATES results are consistent with a burst coming from outside the FOV, with DeltaLLHOut of 0.4. 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 35204 table
GRB_name GRB231123B
GCN_number 35204
Detection_method Fermi GBM Det
t_trigger 19:25:21.510 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 35204 SUBJECT: GRB 231123B: Fermi GBM Observation DATE: 23/11/27 23:30:13 GMT FROM: Sarah Dalessi at UAH S. Dalessi (UAH), S. Lesage (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 19:25:21.51 UT on 23 November 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231123B (trigger 722460326/231123809). which was also detected by Swift/BAT-GUANO (J. DeLaunay et al. 2023, GCN 35195). The Fermi Final Localization was reported in GCN 35170. The angle from the Fermi LAT boresight is 104 degrees. The GBM light curve single peak with a duration (T90) of about 77 s (50-300 keV). The time-averaged spectrum from T0+0.003 to T0+76.802 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.2 +/- 0.2 and the cutoff energy, parameterized as Epeak, is 160 +/- 38 keV. The event fluence (10-1000 keV) in this time interval is (5.9 +/- 0.7)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+4.5 s in the 10-1000 keV band is 1.9 +/- 0.3 ph/s/cm^2. The spectrum is also well fit a Band function with Epeak = 115 +/- 44 keV, alpha = -1.05 +/- 0.28, and beta = -2.16 +/- 0.31. 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/"