| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090426690 |
|
| T0 |
16:33:32.050 UTC |
Fermi_GBM |
| ra |
82.7000° |
Fermi_GBM |
| decl |
-9.7000° |
Fermi_GBM |
| pos_error |
3.79e+00° |
Fermi_GBM |
| T90 |
7.488 s |
Fermi_GBM |
| T90_error |
2.496 s |
Fermi_GBM |
| T90_start |
16:33:32.050 UTC |
Fermi_GBM |
| fluence |
3.54e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
8.82e-08 erg/cm² |
Fermi_GBM |
| T100 |
7.488 s |
|
| GBM_located |
True |
|
| mjd |
54947.68995428241 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090426690 |
| trigger_name |
bn090426690 |
| ra |
82.7000° |
| decl |
-9.7000° |
| pos_error |
3.79e+00° |
| datum |
2009-04-26 |
| t_trigger |
16:33:33.202 UTC |
| T90 |
7.488 s |
| T90_error |
2.496 s |
| T90_start |
16:33:32.050 UTC |
| fluence |
3.54e-06 erg/cm² |
| fluence_error |
8.82e-08 erg/cm² |
| flux_1024 |
6.31e+00 erg/cm²/s |
| flux_1024_error |
1.94e-01 erg/cm²/s |
| flux_1024_time |
1.92e-01 erg/cm²/s |
| flux_64 |
9.16e+00 erg/cm²/s |
| flux_64_error |
8.55e-01 erg/cm²/s |
| GCN 9300 table |
|---|
| GRB_name |
GRB090426C |
| GCN_number |
9300 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
16:33:49.270 UTC |
| ra |
82.7000° |
| decl |
-9.7000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9300
SUBJECT: GRB 090426C: Fermi GBM detection
DATE: 09/04/29 20:21:03 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 16:33:49.27 UT on 26 April 2009, the Fermi Gamma-ray Burst Monitor
(GBM) triggered and located GRB 090426C (trigger 262456415 / 090426.690).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 82.7, Dec = -9.7 (J2000 degrees, equivalent to
J2000 5h31m, -9d40'), with a statistical uncertainty of 2.0 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 main pulse, with a duration of ~12
seconds. The time-averaged spectrum from T0-0.4 to T0+9.9 s is adequately
fit by a power law with an exponential high-energy cutoff, but can also
be well fit by a Band function, although the beta value for the latter
is poorly constrained. For the power law with exponential cutoff, the
index is -1.31 +/- 0.09 and the cutoff energy, parameterized as Epeak,
is 351 +150/-81 keV. For the Band function, alpha is -1.29 +/- 0.11,
beta is -1.98 +0.17/-0.64 and Epeak is 295 +166/-83.
The fluence (8-1000 keV) in this time interval is (3.1 +/- 0.2)E-6
erg/cm^2.
The 1-sec peak photon flux measured starting from T0+0.7s in the
8-1000 keV band is 6.8 +/- 0.7 ph/s/cm^2.
The temporal and spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|