| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB081225257 |
|
| T0 |
6:09:02.655 UTC |
Fermi_GBM |
| ra |
234.1000° |
Fermi_GBM |
| decl |
-64.6000° |
Fermi_GBM |
| pos_error |
5.35e+00° |
Fermi_GBM |
| T90 |
41.217 s |
Fermi_GBM |
| T90_error |
5.667 s |
Fermi_GBM |
| T90_start |
6:09:02.655 UTC |
Fermi_GBM |
| fluence |
6.75e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
8.95e-08 erg/cm² |
Fermi_GBM |
| T100 |
41.217 s |
|
| GBM_located |
True |
|
| mjd |
54825.25628072917 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB081225257 |
| trigger_name |
bn081225257 |
| ra |
234.1000° |
| decl |
-64.6000° |
| pos_error |
5.35e+00° |
| datum |
2008-12-25 |
| t_trigger |
6:09:21.343 UTC |
| T90 |
41.217 s |
| T90_error |
5.667 s |
| T90_start |
6:09:02.655 UTC |
| fluence |
6.75e-06 erg/cm² |
| fluence_error |
8.95e-08 erg/cm² |
| flux_1024 |
2.15e+00 erg/cm²/s |
| flux_1024_error |
1.45e-01 erg/cm²/s |
| flux_1024_time |
-4.61e+00 erg/cm²/s |
| flux_64 |
3.73e+00 erg/cm²/s |
| flux_64_error |
6.76e-01 erg/cm²/s |
| GCN 8784 table |
|---|
| GRB_name |
GRB081225A |
| GCN_number |
8784 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
6:09:21.340 UTC |
| ra |
234.1000° |
| decl |
-64.6000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 8784
SUBJECT: Fermi/GBM detection of GRB 081225
DATE: 09/01/07 16:46:18 GMT
FROM: Chryssa Kouveliotou at MSFC
Chryssa Kouveliotou (NASA/MSFC), Valerie Connaughton (UAHuntsville) report on behalf of the Fermi GBM Team:
"At 06:09:21.34 UT on 25 December 2008, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 081225 (trigger 251878162/081225256).
The on-ground calculated location, using the GBM trigger data, is RA = 234.1, DEC = -64.6 (J2000 degrees, equivalent to 15 h 36.5 m, -64 d 36 '), with an uncertainty of 6.9 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 55 degrees.
The GBM light curve consists of a single pulse with a duration (T90) of about 42 s (50-300 keV). The time-averaged spectrum from T0-18.43 s to T0+18.43 s is best fit by a simple power law function with index -1.51+/- 0.04 (chi squared 233 for 220 d.o.f.).
The event fluence (50-300 keV) in this time interval is (2.45 +/- 0.06)E-6 erg/cm^2. The 6.14-sec peak photon flux measured starting from T0-6.144 s in the 50-300 keV band is 0.60 +/- 0.02 ph/s/cm^2.
The spectral and timing analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
|