| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB220924906 |
|
| T0 |
21:44:49.038 UTC |
Fermi_GBM |
| ra |
321.4800° |
Fermi_GBM |
| decl |
33.8400° |
Fermi_GBM |
| pos_error |
4.62e+00° |
Fermi_GBM |
| T90 |
127.746 s |
Fermi_GBM |
| T90_error |
5.431 s |
Fermi_GBM |
| T90_start |
21:44:49.038 UTC |
Fermi_GBM |
| fluence |
7.69e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
1.19e-07 erg/cm² |
Fermi_GBM |
| T100 |
127.746 s |
|
| GBM_located |
True |
|
| mjd |
59846.906123125 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB220924906 |
| trigger_name |
bn220924906 |
| ra |
321.4800° |
| decl |
33.8400° |
| pos_error |
4.62e+00° |
| datum |
2022-09-24 |
| t_trigger |
21:44:54.414 UTC |
| T90 |
127.746 s |
| T90_error |
5.431 s |
| T90_start |
21:44:49.038 UTC |
| fluence |
7.69e-06 erg/cm² |
| fluence_error |
1.19e-07 erg/cm² |
| flux_1024 |
2.51e+00 erg/cm²/s |
| flux_1024_error |
2.25e-01 erg/cm²/s |
| flux_1024_time |
1.86e+00 erg/cm²/s |
| flux_64 |
5.48e+00 erg/cm²/s |
| flux_64_error |
1.21e+00 erg/cm²/s |
| GCN 32579 table |
|---|
| GRB_name |
GRB220924A |
| GCN_number |
32579 |
| Detection_method |
Fermi GBM final loc |
| t_trigger |
21:44:54 UTC |
| ra |
321.5000° |
| decl |
33.8000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 32579
SUBJECT: GRB 220924A: Fermi GBM Final Real-time Localization
DATE: 22/09/24 21:55:30 GMT
FROM: Fermi GBM Team at MSFC/Fermi-GBM
The Fermi GBM team reports the detection of a likely LONG GRB
At 21:44:54 UT on 24 Sep 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220924A (trigger 685748699.41428 / 220924906).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 321.5, Dec = 33.8 (J2000 degrees, equivalent to J2000 21h 26m, 33d 47'), with a statistical uncertainty of 5.2 degrees.
The angle from the Fermi LAT boresight is 91.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220924906/quicklook/glg_skymap_all_bn220924906.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220924906/quicklook/glg_healpix_all_bn220924906.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220924906/quicklook/glg_lc_medres34_bn220924906.gif
|
| GCN 32583 table |
|---|
| GRB_name |
GRB220924A |
| GCN_number |
32583 |
| Detection_method |
Swift Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 32583
SUBJECT: GRB 220924A: Swift/BAT-GUANO detection outside the coded FOV
DATE: 22/09/25 22:33:21 GMT
FROM: Aaron Tohuvavohu at U Toronto
Aaron Tohuvavohu (U Toronto), Gayathri Raman (PSU), James DeLaunay
(UAlabama), Jamie A. Kennea (PSU), report:
Swift/BAT did not localize GRB 220924A onboard (T0:
2022-09-24T21:44:54 UTC, Fermi/GBM GCN 32579).
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,
arXiv:2111.01769), detects the burst with a sqrt(TS) of 10.4 in a
16.384 s analysis time bin.
NITRATES results are consistent with a burst coming from outside the
FOV, with DeltaLLHOut of 2.
See Section 9.1 and Figure 20 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 32593 table |
|---|
| GRB_name |
GRB220924A |
| GCN_number |
32593 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
21:44:54.410 UTC |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 32593
SUBJECT: GRB 220924A: Fermi GBM detection
DATE: 22/09/27 01:12:16 GMT
FROM: Suraj Poolakkil at UAH
S. Poolakkil (UAH) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 21:44:54.41 UT on 24 September 2022, the Fermi Gamma-Ray Burst Monitor
(GBM)
triggered and located GRB 220924A (trigger 685748699 / 220924906, GCN 32579)
which was also detected by the Swift/BAT- GUANO (Tohuvavohu et al. 2022,
GCN 32583).
The angle from the Fermi LAT boresight at the GBM trigger time is 91
degrees.
The GBM light curve consists of multiple peaks followed
by some extended emission with a duration (T90) of about 128 s (50-300 keV).
The time-averaged spectrum from T0-3.07 s to T0+131.07 s
is best fit by a power law function with an exponential
high-energy cutoff. The power law index is -0.87 +/- 0.08 and
the cutoff energy, parameterized as Epeak, is 223 +/- 24 keV.
The event fluence (10-1000 keV) in this time interval is
(1.18 +/- 0.7)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+1.86 s in the 10-1000 keV band
is 2.5 +/- 0.2 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/"
|