| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB151231568 |
|
| T0 |
13:38:08.101 UTC |
Fermi_GBM |
| ra |
150.0800° |
Fermi_GBM |
| decl |
28.8100° |
Fermi_GBM |
| pos_error |
4.10e+00° |
Fermi_GBM |
| T90 |
0.832 s |
Fermi_GBM |
| T90_error |
0.405 s |
Fermi_GBM |
| T90_start |
13:38:08.101 UTC |
Fermi_GBM |
| fluence |
1.20e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
1.61e-08 erg/cm² |
Fermi_GBM |
| T100 |
0.832 s |
|
| GBM_located |
True |
|
| mjd |
57387.56814931713 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB151231568 |
| trigger_name |
bn151231568 |
| ra |
150.0800° |
| decl |
28.8100° |
| pos_error |
4.10e+00° |
| datum |
2015-12-31 |
| t_trigger |
13:38:08.165 UTC |
| T90 |
0.832 s |
| T90_error |
0.405 s |
| T90_start |
13:38:08.101 UTC |
| fluence |
1.20e-06 erg/cm² |
| fluence_error |
1.61e-08 erg/cm² |
| flux_1024 |
5.20e+00 erg/cm²/s |
| flux_1024_error |
2.48e-01 erg/cm²/s |
| flux_1024_time |
-2.56e-01 erg/cm²/s |
| flux_64 |
1.48e+01 erg/cm²/s |
| flux_64_error |
1.22e+00 erg/cm²/s |
| GCN 18788 table |
|---|
| GRB_name |
GRB151231B |
| GCN_number |
18788 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
13:38:08.170 UTC |
| ra |
150.1000° |
| decl |
28.8000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18788
SUBJECT: GRB 151231B: Fermi GBM observation
DATE: 15/12/31 19:42:06 GMT
FROM: Peter Veres at UAH
P Veres (UAH) and C Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 13:38:08.17 UT on 31 December 2015, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 151231B (trigger 473261892 / 151231568).
The on-ground calculated location, using the GBM trigger
data, is RA = 150.1, DEC = 28.8 (J2000 degrees,
equivalent to 10 h 0 m, 28 d 49 '), with an uncertainty
of 3.1 degrees (radius, 1-sigma containment,
statistical only; there is additionally a systematic
error which we have characterized as a core-plus-tail model, with 90% of
GRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg
systematic error. [Connaughton et al. 2015, ApJS, 216, 32] ).
The angle from the Fermi LAT boresight at the GBM trigger time is 50 degrees.
The GBM light curve consists of a single pulse
with a duration (T90) of about 0.8 s (50-300 keV).
The time-averaged spectrum from T0-0.3 s to T0+0.4 s is
abest fit by a power law function with an exponential
high-energy cutoff. The power law index is -0.65 +/- 0.10 and
the cutoff energy, parameterized as Epeak, is 419 +/- 58 keV.
The event fluence (10-1000 keV) in this time interval is
(1.20 +/- 0.07)E-6 erg/cm^2. The 64 ms peak photon flux measured
starting from T0 in the 10-1000 keV band is 14.8 +/- 1.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|