| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090826068 |
|
| T0 |
1:37:30.830 UTC |
Fermi_GBM |
| ra |
140.6200° |
Fermi_GBM |
| decl |
-0.1100° |
Fermi_GBM |
| pos_error |
6.05e+00° |
Fermi_GBM |
| T90 |
8.704 s |
Fermi_GBM |
| T90_error |
2.862 s |
Fermi_GBM |
| T90_start |
1:37:30.830 UTC |
Fermi_GBM |
| fluence |
8.48e-07 erg/cm² |
Fermi_GBM |
| fluence_error |
4.09e-08 erg/cm² |
Fermi_GBM |
| T100 |
8.704 s |
|
| GBM_located |
True |
|
| mjd |
55069.06771793981 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090826068 |
| trigger_name |
bn090826068 |
| ra |
140.6200° |
| decl |
-0.1100° |
| pos_error |
6.05e+00° |
| datum |
2009-08-26 |
| t_trigger |
1:37:31.854 UTC |
| T90 |
8.704 s |
| T90_error |
2.862 s |
| T90_start |
1:37:30.830 UTC |
| fluence |
8.48e-07 erg/cm² |
| fluence_error |
4.09e-08 erg/cm² |
| flux_1024 |
2.82e+00 erg/cm²/s |
| flux_1024_error |
1.59e-01 erg/cm²/s |
| flux_1024_time |
6.85e+00 erg/cm²/s |
| flux_64 |
4.75e+00 erg/cm²/s |
| flux_64_error |
6.86e-01 erg/cm²/s |
| GCN 9845 table |
|---|
| GRB_name |
GRB090826A |
| GCN_number |
9845 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
1:37:31.850 UTC |
| ra |
140.6000° |
| decl |
-0.1000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9845
SUBJECT: GRB 090826: Fermi GBM detection
DATE: 09/08/28 20:27:44 GMT
FROM: Charles Meegan at NASA/MSFC
Charles Meegan (USRA) reports on behalf of the Fermi GBM Team:
"At 01:37:31.85 UT on 26 August 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090826 (trigger 272943453 / 090826068).
The on-ground calculated location, using the GBM trigger
data, is RA = 140.6, DEC = -0.1 (J2000 degrees,
equivalent to 09 h 22 m, -0 d 6'), with an uncertainty
of 9.7 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 35 degrees.
The GBM light curve consists of two pulses
with a duration (T90) of about 8.5 s (8-1000 keV).
The time-averaged spectrum from T0-4.096 s to T0+9.216 s is
well fit by a power law function with an exponential
high energy cutoff. The power law index is -0.96 (+0.32/-0.28)
and the cutoff energy, parameterized as Epeak, is
172 (+132/-64) keV (chi squared 232.84 for 241 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(1.26 +/- 0.27)E-6 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+7.168 s in the 8-1000 keV band
is 3.28 +/- 0.35 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|