| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090108020 |
|
| T0 |
0:29:02.301 UTC |
Fermi_GBM |
| ra |
260.8000° |
Fermi_GBM |
| decl |
46.0000° |
Fermi_GBM |
| pos_error |
4.47e+00° |
Fermi_GBM |
| T90 |
0.704 s |
Fermi_GBM |
| T90_error |
0.143 s |
Fermi_GBM |
| T90_start |
0:29:02.301 UTC |
Fermi_GBM |
| fluence |
7.47e-07 erg/cm² |
Fermi_GBM |
| fluence_error |
1.66e-08 erg/cm² |
Fermi_GBM |
| T100 |
0.704 s |
|
| GBM_located |
True |
|
| mjd |
54839.02016552084 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090108020 |
| trigger_name |
bn090108020 |
| ra |
260.8000° |
| decl |
46.0000° |
| pos_error |
4.47e+00° |
| datum |
2009-01-08 |
| t_trigger |
0:29:02.365 UTC |
| T90 |
0.704 s |
| T90_error |
0.143 s |
| T90_start |
0:29:02.301 UTC |
| fluence |
7.47e-07 erg/cm² |
| fluence_error |
1.66e-08 erg/cm² |
| flux_1024 |
7.91e+00 erg/cm²/s |
| flux_1024_error |
2.51e-01 erg/cm²/s |
| flux_1024_time |
-1.28e-01 erg/cm²/s |
| flux_64 |
2.54e+01 erg/cm²/s |
| flux_64_error |
1.36e+00 erg/cm²/s |
| GCN 8798 table |
|---|
| GRB_name |
GRB090108A |
| GCN_number |
8798 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
0:29:02.370 UTC |
| ra |
263.0400° |
| decl |
52.4600° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 8798
SUBJECT: GRB 090108: Fermi GBM Detection
DATE: 09/01/12 19:00:42 GMT
FROM: Adam Goldstein at Fermi-GBM/UAH
A. Goldstein (UAH) and R. Preece (UAH)
report on behalf of the Fermi GBM Team:
"At 00:29:02.37 UT on 08 January 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090108 (trigger 253067344 / 090108020).
The on-ground calculated location, using the GBM trigger
data, is RA = 263.04, DEC = 52.46 (J2000 degrees,
equivalent to 17h 32m, 52d 28'), with an uncertainty
of 2.93 degrees (radius, 1-sigma containment,
statistical only; there is additionally a systematic
error which is currently estimated to be 2 to 3 degrees).
The angle from the Fermi LAT boresight is 60 degrees.
The GBM light curve consists of a single bright pulse
followed by a peak of significantly lesser intensity.
The duration of the burst (T90) is about 0.90 s (8-1000 keV).
The time-averaged spectrum from T0-0.17 s to T0+0.73 s is
best fit by a Band function with Epeak = 104.8 +/- 16.4 keV,
alpha = -0.47 +/- 0.20, and beta = -1.97 +/- 0.09
(chi squared 722.8.5 for 733 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(1.28 +/- 0.24)E-06 erg/cm^2. The 0.064-sec peak photon flux measured
starting from T0+0.027 s in the 8-1000 keV band
is 39.7 +/- 3.9 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|