| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB080927480 |
|
| T0 |
11:30:31.850 UTC |
Fermi_GBM |
| ra |
61.3000° |
Fermi_GBM |
| decl |
27.4000° |
Fermi_GBM |
| pos_error |
4.16e+00° |
Fermi_GBM |
| T90 |
45.313 s |
Fermi_GBM |
| T90_error |
3.083 s |
Fermi_GBM |
| T90_start |
11:30:31.850 UTC |
Fermi_GBM |
| fluence |
2.96e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
9.64e-08 erg/cm² |
Fermi_GBM |
| T100 |
45.313 s |
|
| GBM_located |
True |
|
| mjd |
54736.479535300925 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB080927480 |
| trigger_name |
bn080927480 |
| ra |
61.3000° |
| decl |
27.4000° |
| pos_error |
4.16e+00° |
| datum |
2008-09-27 |
| t_trigger |
11:30:32.106 UTC |
| T90 |
45.313 s |
| T90_error |
3.083 s |
| T90_start |
11:30:31.850 UTC |
| fluence |
2.96e-06 erg/cm² |
| fluence_error |
9.64e-08 erg/cm² |
| flux_1024 |
2.63e+00 erg/cm²/s |
| flux_1024_error |
2.45e-01 erg/cm²/s |
| flux_1024_time |
5.38e+00 erg/cm²/s |
| flux_64 |
4.99e+00 erg/cm²/s |
| flux_64_error |
1.33e+00 erg/cm²/s |
| GCN 8302 table |
|---|
| GRB_name |
GRB080927A |
| GCN_number |
8302 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
11:30:32 UTC |
| ra |
57.8000° |
| decl |
30.0000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 8302
SUBJECT: GRB 080927: Fermi GBM detection
DATE: 08/09/30 15:04:40 GMT
FROM: Elisabetta Bissaldi at MPE
E. Bissaldi, S. McBreen and A. von Kienlin (MPE)
report on behalf of the Fermi GBM Team:
"At 11:30:32 UT on 27 September 2008, the Fermi Gamma-ray Burst Monitor
triggered and located GRB 080927 (trigger 244207833 / 080927480).
The on-ground calculated location, using the Fermi GBM
trigger data, is RA = 57.8, Dec = +30.0
(equivalent to J2000 03h 51m, 30d 00'),
with a statistical uncertainty of 4.0 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 75 degrees.
This GRB is singled peaked with an estimated
T90 (25-1000 keV) of about 25 s.
The time-averaged spectrum from T0-1.3s to T0+20.2s is
adequately fit by a simple power law with index -1.5 +/- 0.1.
An improvement in the fit is obtained using the
Band model with Epeak = 40 +/- 10 keV and beta = -1.7 +/- 0.1.
However alpha is poorly constrained.
The fluence (25-1000 keV) in this time interval from the
power law model is (5.7 +/- 0.2)E-06 erg/cm2.
The 1s peak photon flux measured starting from T0+5.9
in the 25-1000 keV band is 2.0 +/- 0.1 ph/s/cm2.
The spectral analysis results presented above are preliminary;
the final results will be published in the Fermi GBM GRB Catalog."
|