| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB170818137 |
|
| T0 |
3:17:19.915 UTC |
Fermi_GBM |
| ra |
297.2200° |
Fermi_GBM |
| decl |
6.3500° |
Fermi_GBM |
| pos_error |
8.96e+00° |
Fermi_GBM |
| T90 |
0.576 s |
Fermi_GBM |
| T90_error |
2.519 s |
Fermi_GBM |
| T90_start |
3:17:19.915 UTC |
Fermi_GBM |
| fluence |
2.89e-07 erg/cm² |
Fermi_GBM |
| fluence_error |
1.84e-08 erg/cm² |
Fermi_GBM |
| T100 |
0.576 s |
|
| GBM_located |
True |
|
| mjd |
57983.13703605324 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB170818137 |
| trigger_name |
bn170818137 |
| ra |
297.2200° |
| decl |
6.3500° |
| pos_error |
8.96e+00° |
| datum |
2017-08-18 |
| t_trigger |
3:17:19.979 UTC |
| T90 |
0.576 s |
| T90_error |
2.519 s |
| T90_start |
3:17:19.915 UTC |
| fluence |
2.89e-07 erg/cm² |
| fluence_error |
1.84e-08 erg/cm² |
| flux_1024 |
3.79e+00 erg/cm²/s |
| flux_1024_error |
2.89e-01 erg/cm²/s |
| flux_1024_time |
-1.28e-01 erg/cm²/s |
| flux_64 |
1.43e+01 erg/cm²/s |
| flux_64_error |
1.55e+00 erg/cm²/s |
| GCN 21573 table |
|---|
| GRB_name |
GRB170818A |
| GCN_number |
21573 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
3:17:19.980 UTC |
| ra |
297.2000° |
| decl |
6.4000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 21573
SUBJECT: GRB 170818A: Fermi GBM detection
DATE: 17/08/18 19:25:23 GMT
FROM: Oliver J Roberts at USRA/NASA
O.J. Roberts (USRA) and C. Meegan (UAH) report on behalf of
the Fermi GBM Team:
"At 03:17:19.98 UT on 18 August 2017, the Fermi Gamma-Ray
Burst Monitor triggered and located GRB 170818A
(trigger 524719044 / 170818137). The on-ground calculated
location, using the GBM trigger data, is RA = 297.2,
DEC = +6.4, with an uncertainty of 11.5 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 initial angle from the Fermi LAT boresight to
the GBM best location is 109 degrees.
The GBM triggered on a single pulse over a
total duration (T90) of about 0.6 s (50-300 keV).
The time-averaged spectrum from T0-0.06 to T0+0.51 s is
best fit by a power law function with an exponential
high-energy cutoff. The power law index is -0.37 +/- 0.32 and
the cutoff energy, parameterized as Epeak, is 80 +/- 9 keV
The event fluence (10-1000 keV) in this time interval is
(2.6 +/- 0.3)E-07 erg/cm^2. The 64 ms peak photon flux measured
starting from T0+0.0 s in the 10-1000 keV band
is 14 +/- 2 ph/s/cm^2.
|