| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB160227831 |
|
| T0 |
19:57:06.330 UTC |
GCN_circulars,Fermi GBM Det |
| ra |
123.4300° |
Fermi_GBM |
| decl |
-48.2700° |
Fermi_GBM |
| pos_error |
2.64e+00° |
Fermi_GBM |
| T90 |
7.68 s |
Fermi_GBM |
| T90_error |
0.81 s |
Fermi_GBM |
| T90_start |
19:57:06.587 UTC |
Fermi_GBM |
| fluence |
1.66e-05 erg/cm² |
Fermi_GBM |
| fluence_error |
4.20e-08 erg/cm² |
Fermi_GBM |
| T100 |
7.937 s |
|
| GBM_located |
True |
|
| mjd |
57445.83132326389 |
GCN_circulars,Fermi GBM Det |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB160227831 |
| trigger_name |
bn160227831 |
| ra |
123.4300° |
| decl |
-48.2700° |
| pos_error |
2.64e+00° |
| datum |
2016-02-27 |
| t_trigger |
19:57:06.331 UTC |
| T90 |
7.68 s |
| T90_error |
0.81 s |
| T90_start |
19:57:06.587 UTC |
| fluence |
1.66e-05 erg/cm² |
| fluence_error |
4.20e-08 erg/cm² |
| flux_1024 |
1.03e+01 erg/cm²/s |
| flux_1024_error |
2.69e-01 erg/cm²/s |
| flux_1024_time |
1.73e+00 erg/cm²/s |
| flux_64 |
1.52e+01 erg/cm²/s |
| flux_64_error |
1.22e+00 erg/cm²/s |
| GCN 19111 table |
|---|
| GRB_name |
GRB160227B |
| GCN_number |
19111 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
19:57:06.330 UTC |
| ra |
123.4000° |
| decl |
-48.3000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 19111
SUBJECT: GRB 160227B: Fermi GBM detection
DATE: 16/02/28 20:58:28 GMT
FROM: Matthew Stanbro at UAH/Fermi
Matthew Stanbro (UAH) and C. Meegan (UAH)
reports on behalf of the Fermi GBM Team:
"At 19:57:06.33 UT on 27 February 2016, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 160227B (trigger 478295830 / 160227831).
The on-ground calculated location, using the GBM trigger
data, is RA = 123.4, DEC = -48.3, with an uncertainty
of 1.3 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 54
degrees.
The GBM light curve consists of 2 episodes
with a duration (T90) of about 8 s (50-300 keV).
The time-averaged spectrum from T0+0.14 s to T0+8.34 s is
best fit by a power law function with an exponential
high-energy cutoff. The power law index is -0.25 +/- 0.04 and
the cutoff energy, parameterized as Epeak, is 544 +/- 19 keV
The event fluence (10-1000 keV) in this time interval is
(1.86 +/- 0.03)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+1.73 s in the 10-1000 keV band
is 10.27 +/- 0.27 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|