| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090902401 |
|
| T0 |
9:38:03.190 UTC |
Fermi_GBM |
| ra |
290.9800° |
Fermi_GBM |
| decl |
53.1100° |
Fermi_GBM |
| pos_error |
5.28e+00° |
Fermi_GBM |
| T90 |
3.2 s |
Fermi_GBM |
| T90_error |
1.797 s |
Fermi_GBM |
| T90_start |
9:38:03.190 UTC |
Fermi_GBM |
| fluence |
1.67e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
4.29e-08 erg/cm² |
Fermi_GBM |
| T100 |
3.2 s |
|
| GBM_located |
True |
|
| mjd |
55076.40142581019 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090902401 |
| trigger_name |
bn090902401 |
| ra |
290.9800° |
| decl |
53.1100° |
| pos_error |
5.28e+00° |
| datum |
2009-09-02 |
| t_trigger |
9:38:05.494 UTC |
| T90 |
3.2 s |
| T90_error |
1.797 s |
| T90_start |
9:38:03.190 UTC |
| fluence |
1.67e-06 erg/cm² |
| fluence_error |
4.29e-08 erg/cm² |
| flux_1024 |
4.56e+00 erg/cm²/s |
| flux_1024_error |
2.56e-01 erg/cm²/s |
| flux_1024_time |
3.00e-03 erg/cm²/s |
| flux_64 |
8.04e+00 erg/cm²/s |
| flux_64_error |
1.16e+00 erg/cm²/s |
| GCN 9865 table |
|---|
| GRB_name |
GRB090902A |
| GCN_number |
9865 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
9:38:05.490 UTC |
| ra |
291.0000° |
| decl |
53.1000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9865
SUBJECT: GRB 090902: Fermi GBM detection
DATE: 09/09/02 16:44:07 GMT
FROM: Elisabetta Bissaldi at MPE
E. Bissaldi and A. von Kienlin (MPE)
report on behalf of the Fermi GBM Team:
"At 09:38:05.49 UT on 2 September 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090902 (trigger 273577087 / 090902401).
The on-ground calculated location, using the GBM trigger
data, is RA = 291.0, DEC = 53.1 (J2000 degrees,
equivalent to 19h 24m, 53d 06'), with an uncertainty
of 3.8 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 82 degrees.
This burst was also independently detected by INTEGRAL SPI-ACS.
The GBM light curve consists of a single peak
with a duration (T90) of about 1.2 s (8-1000 keV).
The time-averaged spectrum from T0-0.256 s to T0+0.896 s is
best fit by a Band function with Epeak = 388 (+82/-102) keV,
alpha = 0.30 (+0.5/-0.26), and beta = -2.05 (+0.29/-0.24)
(chi squared 372 for 356 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(2.11 +/- 0.14)E-06 erg/cm^2. The 64-msec peak photon flux measured
starting from T0+608 s in the 8-1000 keV band
is 11.4 +/- 1.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|