| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB080920268 |
|
| T0 |
6:25:45.531 UTC |
Fermi_GBM |
| ra |
121.6000° |
Fermi_GBM |
| decl |
8.9000° |
Fermi_GBM |
| pos_error |
6.90e+00° |
Fermi_GBM |
| T90 |
113.921 s |
Fermi_GBM |
| T90_error |
3.125 s |
Fermi_GBM |
| T90_start |
6:25:45.531 UTC |
Fermi_GBM |
| fluence |
1.87e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
6.34e-08 erg/cm² |
Fermi_GBM |
| T100 |
113.921 s |
|
| GBM_located |
True |
|
| mjd |
54729.267888090275 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB080920268 |
| trigger_name |
bn080920268 |
| ra |
121.6000° |
| decl |
8.9000° |
| pos_error |
6.90e+00° |
| datum |
2008-09-20 |
| t_trigger |
6:25:48.859 UTC |
| T90 |
113.921 s |
| T90_error |
3.125 s |
| T90_start |
6:25:45.531 UTC |
| fluence |
1.87e-06 erg/cm² |
| fluence_error |
6.34e-08 erg/cm² |
| flux_1024 |
1.08e+00 erg/cm²/s |
| flux_1024_error |
1.08e-01 erg/cm²/s |
| flux_1024_time |
-1.79e+00 erg/cm²/s |
| flux_64 |
3.49e+00 erg/cm²/s |
| flux_64_error |
7.77e-01 erg/cm²/s |
| GCN 8290 table |
|---|
| GRB_name |
GRB080920A |
| GCN_number |
8290 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
6:25:48 UTC |
| ra |
124.6000° |
| decl |
1.6000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 8290
SUBJECT: GRB 080920: Fermi GBM detection
DATE: 08/09/25 13:55:36 GMT
FROM: Andreas von Kienlin at MPE
A. von Kienlin (MPE), E. Bissaldi (MPE), S. McBreen (MPE)
report on behalf of the Fermi GBM Team:
"At 06:25:48 UT on 20 September 2008, the Fermi Gamma-ray Burst Monitor
triggered and located GRB 080920 (trigger 243584749 / 080920268).
The on-ground calculated location using the Fermi GBM trigger data is
RA = 124.6, Dec = 1.6 (equivalent to J2000 08h 18m, 01d 36'),
with a statistical uncertainty of 3.4 degrees
(radius, 1-sigma containment; there is additionally a systematic
error which is currently estimated to be 2 to 3 degrees).
The angle from the Fermi LAT boresight is 16 degrees.
This long GRB comprises one FRED like pulse, starting at T0-6 s.
T90 (25-1000 keV) is about 85 s. The time-averaged spectrum
from T0-6 to T0+79 s is adequately fit by a power law model
with index -1.42 +/- 0.06. It can also be fit with a power
law function with an exponential high energy cutoff.
The cutoff energy, parameterized as Epeak, is 162 +/- 35 keV.
In this case the power law index is poorly constrained (-0.63 +/- 0.25).
The fluence in the 25-1000 keV band is 2.4 (+/- 0.5) E-06 erg/cm2
and the peak flux (25-1000 keV) on the 1 s timescale
is 1.29 (+/- 0.14) ph/cm2/s.
The spectral analysis results presented above are preliminary;
final results will be published in the Fermi GBM GRB Catalog."
|