| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB081231140 |
|
| T0 |
3:21:01.794 UTC |
Fermi_GBM |
| ra |
208.6000° |
Fermi_GBM |
| decl |
-35.8000° |
Fermi_GBM |
| pos_error |
2.65e+00° |
Fermi_GBM |
| T90 |
28.736 s |
Fermi_GBM |
| T90_error |
2.611 s |
Fermi_GBM |
| T90_start |
3:21:02.434 UTC |
Fermi_GBM |
| fluence |
1.61e-05 erg/cm² |
Fermi_GBM |
| fluence_error |
1.17e-07 erg/cm² |
Fermi_GBM |
| T100 |
29.376 s |
|
| GBM_located |
True |
|
| mjd |
54831.139604097225 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB081231140 |
| trigger_name |
bn081231140 |
| ra |
208.6000° |
| decl |
-35.8000° |
| pos_error |
2.65e+00° |
| datum |
2008-12-31 |
| t_trigger |
3:21:01.794 UTC |
| T90 |
28.736 s |
| T90_error |
2.611 s |
| T90_start |
3:21:02.434 UTC |
| fluence |
1.61e-05 erg/cm² |
| fluence_error |
1.17e-07 erg/cm² |
| flux_1024 |
1.12e+01 erg/cm²/s |
| flux_1024_error |
2.29e-01 erg/cm²/s |
| flux_1024_time |
2.56e+01 erg/cm²/s |
| flux_64 |
1.74e+01 erg/cm²/s |
| flux_64_error |
1.05e+00 erg/cm²/s |
| GCN 8781 table |
|---|
| GRB_name |
GRB081231A |
| GCN_number |
8781 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
3:21:01.930 UTC |
| ra |
218.7400° |
| decl |
-38.7200° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 8781
SUBJECT: GRB 081231: Fermi GBM Detection
DATE: 09/01/06 02:43:13 GMT
FROM: Adam Goldstein at Fermi-GBM/UAH
A. Goldstein (UAH) and R. Preece (UAH)
report on behalf of the Fermi GBM Team:
"At 03:21:01.93 UT on 31 December 2008, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 081231 (trigger 252386462 / 081231140).
The on-ground calculated location, using the GBM trigger
data, is RA = 218.74, DEC = -38.72 (J2000 degrees,
equivalent to 14 h 35 m, -38 d 43'), with an uncertainty
of 1.0 degree (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 20 degrees.
This burst was also independently detected by INTEGRAL SPI-ACS.
The GBM light curve consists of three main emission peaks with
apparent substructure and a duration (T90) of about 29 s (8-1000 keV).
The time-averaged spectrum from T0-4.1 s to T0+37.9 s is best fit by
a Band function with Epeak = 152.3 +/- 11.9 keV,
alpha = -0.80 +/- 0.06, and beta = -2.03 +/- 0.07.
(chi squared 998 for 726 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
1.2E-05 +/- 5.9E-07 erg/cm^2. The peak photon flux measured
starting from T0-4.1 s in the 8-1000 keV band
is 1.53 +/- 0.08 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|