| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090922539 |
|
| T0 |
12:56:42.137 UTC |
Fermi_GBM |
| ra |
17.1600° |
Fermi_GBM |
| decl |
74.3000° |
Fermi_GBM |
| pos_error |
2.45e+00° |
Fermi_GBM |
| T90 |
87.041 s |
Fermi_GBM |
| T90_error |
0.81 s |
Fermi_GBM |
| T90_start |
12:56:42.649 UTC |
Fermi_GBM |
| fluence |
1.10e-05 erg/cm² |
Fermi_GBM |
| fluence_error |
4.98e-08 erg/cm² |
Fermi_GBM |
| T100 |
87.553 s |
|
| GBM_located |
True |
|
| mjd |
55096.53937658565 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090922539 |
| trigger_name |
bn090922539 |
| ra |
17.1600° |
| decl |
74.3000° |
| pos_error |
2.45e+00° |
| datum |
2009-09-22 |
| t_trigger |
12:56:42.137 UTC |
| T90 |
87.041 s |
| T90_error |
0.81 s |
| T90_start |
12:56:42.649 UTC |
| fluence |
1.10e-05 erg/cm² |
| fluence_error |
4.98e-08 erg/cm² |
| flux_1024 |
1.47e+01 erg/cm²/s |
| flux_1024_error |
2.37e-01 erg/cm²/s |
| flux_1024_time |
1.09e+00 erg/cm²/s |
| flux_64 |
1.67e+01 erg/cm²/s |
| flux_64_error |
9.99e-01 erg/cm²/s |
| GCN 9929 table |
|---|
| GRB_name |
GRB090922A |
| GCN_number |
9929 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
12:56:42.140 UTC |
| ra |
17.1000° |
| decl |
74.3000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9929
SUBJECT: GRB 090922A: Fermi GBM detection
DATE: 09/09/23 07:26:52 GMT
FROM: Arne Rau at MPE
Arne Rau (MPE) reports on behalf of the Fermi GBM Team:
"At 12:56:42.14 UT on 22 September 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090922A (trigger 275317004 / 090922539).
The on-ground calculated location, using the GBM trigger
data, is RA = 17.1, DEC = 74.3 (J2000 degrees,
equivalent to 17h 06m, 74d 18'), with an uncertainty
of 1 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 19 degrees.
Moreover, this burst was bright enough to result in
a Fermi spacecraft re-pointing maneuver.
The GBM light curve shows a bright peak of approximately 10s duration
followed by a weaker pulse approx. 60s later. The burst duration (T90)
is 92 +/ 3 s (8-1000 keV).
The time-averaged spectrum of the main peak from T+0.003 s to T0+10.240
s is
best fit by a Band function with Epeak = 139.3 +/- 6.6 keV,
alpha = -0.77 +/- 0.05, and beta = -2.28 +/- 0.07 (chi squared 1217/921
d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(1.14 +/- 0.02)E-05 erg/cm^2. The 1.024-sec peak photon flux measured
starting from T0+2.048 s in the 8-1000 keV band
is 15.6 +/- 0.04 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|
| GCN 9930 table |
|---|
| GRB_name |
GRB090922A |
| GCN_number |
9930 |
| Detection_method |
correction |
| ra |
17.1000° |
| decl |
74.3000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9930
SUBJECT: GRB090922A: correction to Fermi location
DATE: 09/09/23 12:18:37 GMT
FROM: Arne Rau at MPE
Arne Rau (MPE) reports on behalf of the Fermi GBM Team:
"There has been a typo in the GBM localization of GRB 090922A (Rau,
GCN#9929). The
correct location is:
RA=17.1deg (01h08min) and Dec=74.3deg (74d18')
with an uncertainty of 1 degree (radius, 1-sigma containment,
statistical only; there is
additionally a systematic error which is currently estimated to be 2 to
3 degrees).
I thank S. Holland for realizing this."
|