| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090925389 |
|
| T0 |
9:20:33.670 UTC |
GCN_circulars,Fermi GBM Det |
| ra |
333.2100° |
Fermi_GBM |
| decl |
14.2700° |
Fermi_GBM |
| pos_error |
4.02e+00° |
Fermi_GBM |
| T90 |
25.472 s |
Fermi_GBM |
| T90_error |
3.525 s |
Fermi_GBM |
| T90_start |
9:20:33.736 UTC |
Fermi_GBM |
| fluence |
8.91e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
3.13e-07 erg/cm² |
Fermi_GBM |
| T100 |
25.538 s |
|
| GBM_located |
True |
|
| mjd |
55099.389278587965 |
GCN_circulars,Fermi GBM Det |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090925389 |
| trigger_name |
bn090925389 |
| ra |
333.2100° |
| decl |
14.2700° |
| pos_error |
4.02e+00° |
| datum |
2009-09-25 |
| t_trigger |
9:20:33.672 UTC |
| T90 |
25.472 s |
| T90_error |
3.525 s |
| T90_start |
9:20:33.736 UTC |
| fluence |
8.91e-06 erg/cm² |
| fluence_error |
3.13e-07 erg/cm² |
| flux_1024 |
4.56e+00 erg/cm²/s |
| flux_1024_error |
2.54e-01 erg/cm²/s |
| flux_1024_time |
4.86e+00 erg/cm²/s |
| flux_64 |
7.76e+00 erg/cm²/s |
| flux_64_error |
1.53e+00 erg/cm²/s |
| GCN 9932 table |
|---|
| GRB_name |
GRB090925A |
| GCN_number |
9932 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
9:20:33.670 UTC |
| ra |
333.2000° |
| decl |
14.3000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9932
SUBJECT: GRB 090925: Fermi GBM detection
DATE: 09/09/25 14:54:03 GMT
FROM: Elisabetta Bissaldi at MPE
E.Bissaldi and D.Gruber (all MPE)
report on behalf of the Fermi GBM Team:
"At 09:20:33.67 UT on 25 September 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090925 (trigger 275563235 / 090925389).
The on-ground calculated location, using the GBM trigger
data, is RA = 333.2, DEC = +14.3 (J2000 degrees,
equivalent to 22h 13m, 14d 18'), with an uncertainty
of 4.5 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 116 degrees.
This burst was also independently detected by INTEGRAL SPI-ACS.
The GBM light curve consists of a FRED-like pulse
with a duration (T90) of about 50 s (8-1000 keV).
The time-averaged spectrum from T0-1 s to T0+20 s is
adequately fit by a Band function with
Epeak = 156 (+25/-20) keV, alpha = -0.60 (+0.14/-0.13),
and beta = -1.91 (+0.07/-0.09) (C-stat 369 for 357 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(9.46 +/- 0.26)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+6 s in the 8-1000 keV band is 4.2 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|