| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090516853 |
|
| T0 |
20:28:39.951 UTC |
Fermi_GBM |
| ra |
15.7000° |
Fermi_GBM |
| decl |
-13.7000° |
Fermi_GBM |
| pos_error |
3.58e+00° |
Fermi_GBM |
| T90 |
14.464 s |
Fermi_GBM |
| T90_error |
3.093 s |
Fermi_GBM |
| T90_start |
20:28:39.951 UTC |
Fermi_GBM |
| fluence |
5.00e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
9.59e-08 erg/cm² |
Fermi_GBM |
| T100 |
14.464 s |
|
| GBM_located |
True |
|
| mjd |
54967.85324017361 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090516853 |
| trigger_name |
bn090516853 |
| ra |
15.7000° |
| decl |
-13.7000° |
| pos_error |
3.58e+00° |
| datum |
2009-05-16 |
| t_trigger |
20:28:40.047 UTC |
| T90 |
14.464 s |
| T90_error |
3.093 s |
| T90_start |
20:28:39.951 UTC |
| fluence |
5.00e-06 erg/cm² |
| fluence_error |
9.59e-08 erg/cm² |
| flux_1024 |
7.98e+00 erg/cm²/s |
| flux_1024_error |
2.38e-01 erg/cm²/s |
| flux_1024_time |
1.60e-01 erg/cm²/s |
| flux_64 |
1.00e+01 erg/cm²/s |
| flux_64_error |
1.07e+00 erg/cm²/s |
| GCN 9418 table |
|---|
| GRB_name |
GRB090516C |
| GCN_number |
9418 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
20:28:40.050 UTC |
| ra |
15.7000° |
| decl |
-13.7000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9418
SUBJECT: GRB 090516C: Fermi GBM detection
DATE: 09/05/21 23:32:21 GMT
FROM: Alexander van der Horst at NASA/MSFC
A.J. van der Horst (NASA/MSFC/ORAU) reports on behalf of the
Fermi GBM Team:
"At 20:28:40.05 UT on 16 May 2009, the Fermi Gamma-ray Burst Monitor
(GBM) triggered and located GRB 090516C (trigger 264198522 / 090516.853).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 15.7, Dec = -13.7 (J2000 degrees, equivalent to
J2000 1h03m, -13d41'), with a statistical uncertainty of 3.5 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 69 degrees.
The GBM light curve consists of one short spike and some smaller peaks,
with a total duration (T90) of 15 s (8-1000 keV). The time-averaged
spectrum from T0+0.00 to T0+15.26 s is adequately fit by a power law
with an exponential high-energy cutoff. The index is -1.51 +/- 0.08
and the cutoff energy, parameterized as Epeak, is 210 +/- 68 keV
(chi squared 372 for 360 d.o.f.). The Band function provides a
significantly better fit (chi squared 365 for 359 d.o.f.) with a lower
Epeak value, but the low-energy index alpha and the amplitude are
poorly constrained: alpha is -0.44 +/- 0.81, beta is -1.81 +/- 0.06,
and Epeak is 38 +/- 14.
The fluence (8-1000 keV) in this interval is (4.0 +/- 0.3)E-6 erg/cm^2.
The 1-sec peak photon flux measured starting from T0+0.0s in the
8-1000 keV band is 7.7 +/- 0.4 ph/s/cm^2.
The spectral and temporal analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|