GRB230822A

This page lists all entries on GRB230822A in GRBweb

Summary Fermi GBM GCN 34521 GCN 34529 GCN 34531

Summary table
Variable Value Source
GRB_name_Fermi GRB230822992
T0 23:48:52.676 UTC Fermi_GBM
ra 143.4200° Fermi_GBM
decl 37.9600° Fermi_GBM
pos_error 1.34e+01° Fermi_GBM
T90 0.896 s Fermi_GBM
T90_error 0.607 s Fermi_GBM
T90_start 23:48:52.676 UTC Fermi_GBM
fluence 5.81e-08 erg/cm² Fermi_GBM
fluence_error 1.19e-08 erg/cm² Fermi_GBM
T100 0.896 s
GBM_located True
mjd 60178.99227634259 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB230822992
trigger_name bn230822992
ra 143.4200°
decl 37.9600°
pos_error 1.34e+01°
datum 2023-08-22
t_trigger 23:48:54.404 UTC
T90 0.896 s
T90_error 0.607 s
T90_start 23:48:52.676 UTC
fluence 5.81e-08 erg/cm²
fluence_error 1.19e-08 erg/cm²
flux_1024 9.37e-01 erg/cm²/s
flux_1024_error 2.02e-01 erg/cm²/s
flux_1024_time -1.79e+00 erg/cm²/s
flux_64 2.19e+00 erg/cm²/s
flux_64_error 8.59e-01 erg/cm²/s
GCN 34521 table
GRB_name GRB230822A
GCN_number 34521
Detection_method Fermi GBM final loc
t_trigger 23:48:54 UTC
ra 143.4000°
decl 38.0000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 34521 SUBJECT: GRB 230822A: Fermi GBM Final Real-time Localization DATE: 23/08/22 23:59:33 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 23:48:54 UT on 22 Aug 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230822A (trigger 714440939.403512 / 230822992). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 143.4, Dec = 38.0 (J2000 degrees, equivalent to J2000 09h 33m, 38d 00'), with a statistical uncertainty of 18.4 degrees. The angle from the Fermi LAT boresight is 78.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230822992/quicklook/glg_skymap_all_bn230822992.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/bn230822992/quicklook/glg_healpix_all_bn230822992.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230822992/quicklook/glg_lc_medres34_bn230822992.gif
GCN 34529 table
GRB_name GRB230822A
GCN_number 34529
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 34529 SUBJECT: GRB 230822A: Swift/BAT-GUANO detection of a burst DATE: 23/08/23 20:26:06 GMT FROM: Jimmy DeLaunay at University of Alabama James DeLaunay (UAlabama), Gayathri Raman (PSU), Samuele Ronchini (PSU), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report: Swift/BAT did not localize GRB 230822A onboard (T0: 2023-08-22T23:48:54.40 UTC, Fermi GBM Trig 714440939, GCN 34521). 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 2022, ApJ, 941, 169), detects the burst with a sqrt(TS) of 9.7 in a 1.024 s analysis time bin, starting at T0 - 1.792 s. NITRATES results, independently, are ambiguous with respect to whether this burst originates from in or outside the BAT coded FOV, with a DeltaLLHOut of 7.7. 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 34531 table
GRB_name GRB230822A
GCN_number 34531
Detection_method Fermi GBM Det
t_trigger 23:48:54 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 34531 SUBJECT: GRB 230822A: Fermi GBM Observation DATE: 23/08/24 01:40:05 GMT FROM: Stephen Lesage at Fermi-GBM Team S. Lesage (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 23:48:54 UT on 22 August 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230822A (trigger 714440939/230822992). which was also detected by Swift/BAT-GUANO (DeLaunay et al. 2023, GCN 34529). The Fermi GBM Final Real-Time Localization was reported previously (Fermi GBM Team 2023, GCN 34521). The angle from the Fermi LAT boresight is 78 degrees. The GBM light curve consists of a single weak emission episode with a duration (T90) of about 0.9 s (50-300 keV). The time-averaged spectrum from T0-0.448 to T0 s is best fit by a simple power law function with index -1.3 +/- 0.2. The event fluence (10-1000 keV) in this time interval is (5.7 +/- 2.6)E-08 erg/cm^2. The 64-ms peak photon flux measured starting from T0-1.7 s in the 10-1000 keV band is 2.2 +/- 0.9 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/"