| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB081226156 |
|
| T0 |
3:43:51.742 UTC |
Fermi_GBM |
| ra |
193.0000° |
Fermi_GBM |
| decl |
26.8000° |
Fermi_GBM |
| pos_error |
5.34e+00° |
Fermi_GBM |
| T90 |
83.713 s |
Fermi_GBM |
| T90_error |
2.769 s |
Fermi_GBM |
| T90_start |
3:43:51.742 UTC |
Fermi_GBM |
| fluence |
4.75e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
4.25e-08 erg/cm² |
Fermi_GBM |
| T100 |
83.713 s |
|
| GBM_located |
True |
|
| mjd |
54826.15545997685 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB081226156 |
| trigger_name |
bn081226156 |
| ra |
193.0000° |
| decl |
26.8000° |
| pos_error |
5.34e+00° |
| datum |
2008-12-26 |
| t_trigger |
3:44:52.415 UTC |
| T90 |
83.713 s |
| T90_error |
2.769 s |
| T90_start |
3:43:51.742 UTC |
| fluence |
4.75e-06 erg/cm² |
| fluence_error |
4.25e-08 erg/cm² |
| flux_1024 |
4.16e+00 erg/cm²/s |
| flux_1024_error |
2.67e-01 erg/cm²/s |
| flux_1024_time |
6.72e+00 erg/cm²/s |
| flux_64 |
6.30e+00 erg/cm²/s |
| flux_64_error |
1.14e+00 erg/cm²/s |
| GCN 8750 table |
|---|
| GRB_name |
GRB081226C |
| GCN_number |
8750 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
3:44:52.410 UTC |
| ra |
189.4000° |
| decl |
27.8000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 8750
SUBJECT: GRB 081226C: Fermi GBM detection
DATE: 08/12/29 15:22:32 GMT
FROM: Elisabetta Bissaldi at MPE
E. Bissaldi (MPE) and S. McBreen (UCD/MPE)
report on behalf of the Fermi GBM Team:
"At 03:44:52.41 UT on 26 December 2008, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 081226C (trigger 251955893 / 081226156).
The on-ground calculated location, using the GBM trigger
data, is RA = 189.4, DEC = 27.8 (J2000 degrees,
equivalent to 12h 38m, 27d 48'), with an uncertainty
of 3.6 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 54 degrees.
This long GRB consists of two main emission pulses plus
weak untriggered emission starting at about T0-45 s
and lasting about 25 s.
The total event duration (T90) is about 60 s (8-1000 keV).
The time-averaged spectrum from T0-3.6 s to T0+10.7 s is
best fit by a power law function with an
exponential high energy cutoff. The power law index is
-1.04 +/- 0.11 and the cutoff energy, parameterized as
Epeak, is 82 +/- 7 keV (chi squared 395 for 362 d.o.f.).
The time-averaged spectrum of the precursor from T0-48.6 s
to T0-28.2 s is also well fit by a power law function with an
exponential high energy cutoff. The power law index is
-1.14 +/- 0.23 and the cutoff energy, parameterized as Epeak,
is 71 +/- 11 keV (chi squared 370 for 363 d.o.f.).
The event fluence (8-1000 keV) from T0-3.6 s to T0+10.7 is
(2.32 +/- 0.24)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+6.6 s in the 8-1000 keV band
is 4.5 +/- 0.8 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|