| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090308734 |
|
| T0 |
17:36:24.379 UTC |
Fermi_GBM |
| ra |
21.9000° |
Fermi_GBM |
| decl |
-54.3000° |
Fermi_GBM |
| pos_error |
3.87e+00° |
Fermi_GBM |
| T90 |
1.664 s |
Fermi_GBM |
| T90_error |
0.286 s |
Fermi_GBM |
| T90_start |
17:36:24.379 UTC |
Fermi_GBM |
| fluence |
2.55e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
2.89e-08 erg/cm² |
Fermi_GBM |
| T100 |
1.664 s |
|
| GBM_located |
True |
|
| mjd |
54898.73361549769 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090308734 |
| trigger_name |
bn090308734 |
| ra |
21.9000° |
| decl |
-54.3000° |
| pos_error |
3.87e+00° |
| datum |
2009-03-08 |
| t_trigger |
17:36:24.699 UTC |
| T90 |
1.664 s |
| T90_error |
0.286 s |
| T90_start |
17:36:24.379 UTC |
| fluence |
2.55e-06 erg/cm² |
| fluence_error |
2.89e-08 erg/cm² |
| flux_1024 |
6.56e+00 erg/cm²/s |
| flux_1024_error |
1.72e-01 erg/cm²/s |
| flux_1024_time |
-6.40e-02 erg/cm²/s |
| flux_64 |
1.23e+01 erg/cm²/s |
| flux_64_error |
7.14e-01 erg/cm²/s |
| GCN 8963 table |
|---|
| GRB_name |
GRB090308B |
| GCN_number |
8963 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
17:36:24.700 UTC |
| ra |
22.4000° |
| decl |
-58.1000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 8963
SUBJECT: GRB 090308B: Fermi GBM detection
DATE: 09/03/09 21:42:26 GMT
FROM: Adam Goldstein at Fermi-GBM/UAH
A. Goldstein (UAH) and A.J. van der Horst (NASA/MSFC/ORAU)
report on behalf of the Fermi GBM Team:
"At 17:36:24.70 UT on 08 March 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090308B (trigger 258226586 / 090308734).
This burst was also independently detected by INTEGRAL SPI-ACS.
The on-ground calculated location, using the GBM trigger
data, is RA = 22.4, DEC = -58.1 (J2000 degrees,
equivalent to 01h 30m, 58d 05'), with an uncertainty
of 2.3 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 50 degrees.
The GBM light curve consists of two peaks with substructure
with a duration (T90) of about 2.11 s (8-1000 keV).
The time-averaged spectrum from T0-0.25 s to T0+1.53 s is
well fit by a power law function with an exponential
high energy cutoff. The power law index is -0.54 +/- 0.11 and
the cutoff energy, parameterized as Epeak, is 710.3 +/- 100.0 keV
(chi squared 342 for 362 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(3.46 +/- 0.13)E-06 erg/cm^2. The 0.128-sec peak photon flux measured
starting from T0+0.64 s in the 8-1000 keV band
is 14.22 +/- 0.91 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|