| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090829702 |
|
| T0 |
16:50:40.130 UTC |
GCN_circulars,Fermi GBM Det |
| ra |
354.9900° |
Fermi_GBM |
| decl |
-9.3600° |
Fermi_GBM |
| pos_error |
3.35e+00° |
Fermi_GBM |
| T90 |
101.633 s |
Fermi_GBM |
| T90_error |
2.29 s |
Fermi_GBM |
| T90_start |
16:50:41.925 UTC |
Fermi_GBM |
| fluence |
4.81e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
5.60e-08 erg/cm² |
Fermi_GBM |
| T100 |
103.428 s |
|
| GBM_located |
True |
|
| mjd |
55072.701853356484 |
GCN_circulars,Fermi GBM Det |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090829702 |
| trigger_name |
bn090829702 |
| ra |
354.9900° |
| decl |
-9.3600° |
| pos_error |
3.35e+00° |
| datum |
2009-08-29 |
| t_trigger |
16:50:40.133 UTC |
| T90 |
101.633 s |
| T90_error |
2.29 s |
| T90_start |
16:50:41.925 UTC |
| fluence |
4.81e-06 erg/cm² |
| fluence_error |
5.60e-08 erg/cm² |
| flux_1024 |
2.59e+00 erg/cm²/s |
| flux_1024_error |
1.54e-01 erg/cm²/s |
| flux_1024_time |
6.46e+00 erg/cm²/s |
| flux_64 |
3.89e+00 erg/cm²/s |
| flux_64_error |
7.78e-01 erg/cm²/s |
| GCN 9856 table |
|---|
| GRB_name |
GRB090829B |
| GCN_number |
9856 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
16:50:40.130 UTC |
| ra |
355.0000° |
| decl |
-9.4000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9856
SUBJECT: GRB 090829B: Fermi GBM Detection
DATE: 09/09/01 02:58:06 GMT
FROM: Colleen A. Wilson at NASA/MSFC/NSSTC
Colleen A. Wilson-Hodge (NASA/MSFC)reports on behalf of the Fermi GBM Team:
"At 16:50:40.13 UT on 29 August 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090829B (trigger 273257442 / 090829702).
The on-ground calculated location, using the GBM trigger data, is
RA = 355.0, DEC = -9.4 (J2000 degrees, equivalent to 23 h 40 m, -9 d 22'),
with an uncertainty of 3.2 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 42 degrees.
The GBM light curve consists of two widely spaced peaks with a duration
(T90) of about 100 s (8-1000 keV). The time-averaged spectrum from
T0-1.5 s to T0+31.2 s is best fit by a Band function with
Epeak = 143 +/- 30 keV, alpha = -0.7 +/- 0.2, and beta = -2.4 +/- 0.5
The event fluence (8-1000 keV) in this time interval is
(6.4 +/- 0.7)E-6 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+4.6 s in the 8-1000 keV band is 3.2 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|