| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB220308233 |
|
| T0 |
5:35:29.587 UTC |
Fermi_GBM |
| ra |
291.8300° |
Fermi_GBM |
| decl |
26.4400° |
Fermi_GBM |
| pos_error |
5.58e+00° |
Fermi_GBM |
| T90 |
32.768 s |
Fermi_GBM |
| T90_error |
4.72 s |
Fermi_GBM |
| T90_start |
5:35:29.587 UTC |
Fermi_GBM |
| fluence |
1.99e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
6.59e-08 erg/cm² |
Fermi_GBM |
| T100 |
32.768 s |
|
| GBM_located |
True |
|
| mjd |
59646.23298133102 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB220308233 |
| trigger_name |
bn220308233 |
| ra |
291.8300° |
| decl |
26.4400° |
| pos_error |
5.58e+00° |
| datum |
2022-03-08 |
| t_trigger |
5:35:30.099 UTC |
| T90 |
32.768 s |
| T90_error |
4.72 s |
| T90_start |
5:35:29.587 UTC |
| fluence |
1.99e-06 erg/cm² |
| fluence_error |
6.59e-08 erg/cm² |
| flux_1024 |
1.86e+00 erg/cm²/s |
| flux_1024_error |
2.13e-01 erg/cm²/s |
| flux_1024_time |
-5.12e-01 erg/cm²/s |
| flux_64 |
4.39e+00 erg/cm²/s |
| flux_64_error |
1.27e+00 erg/cm²/s |
| GCN 31726 table |
|---|
| GRB_name |
GRB220308B |
| GCN_number |
31726 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
5:35:30.100 UTC |
| ra |
292.0000° |
| decl |
26.0000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 31726
SUBJECT: GRB 220308B: Fermi GBM detection
DATE: 22/03/10 01:57:07 GMT
FROM: Cori Fletcher at USRA
C. Fletcher (USRA), O. J. Roberts (USRA) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 05:35:30.10 UT on 08 March 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 220308B (trigger 668410535 / 220308233).
The on-ground calculated location, using the GBM trigger
data, is RA = 292, DEC = 26 (J2000 degrees,
equivalent to 19 h 27 m, 26 d 26'), with a statistical uncertainty
of 5 degrees (radius, 1-sigma containment,
statistical only; there is additionally a systematic
error which we have characterized as a core-plus-tail model, with 90% of
GRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg
systematic error. [Connaughton et al. 2015, ApJS, 216, 32] ).
The angle from the Fermi LAT boresight at the GBM trigger time is 78 degrees.
The GBM light curve consists of multiple peaks
with a duration (T90) of about 33 s (50-300 keV).
The time-averaged spectrum from T0+0.003 s to T0+32.769 s is
best fit by a power law function with an exponential
high-energy cutoff. The power law index is -1.0 +/- 0.1 and
the cutoff energy, parameterized as Epeak, is 342 +/- 93 keV,
The event fluence (10-1000 keV) in this time interval is
(4.4 +/- 0.5)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0-0.512 s in the 10-1000 keV band
is 1.9 +/- 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/"
FSSC: Data Data Access GBM - Fermi Gamma-ray Space Telescope
ID Name Description; GS-001: CTIME (daily version) The counts accumulated every 0.256 seconds in 8 energy channels for each of the 14 detectors. GS-002
fermi.gsfc.nasa.gov
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