| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB091128285 |
|
| T0 |
6:50:15.185 UTC |
Fermi_GBM |
| ra |
127.6900° |
Fermi_GBM |
| decl |
1.7300° |
Fermi_GBM |
| pos_error |
2.62e+00° |
Fermi_GBM |
| T90 |
76.289 s |
Fermi_GBM |
| T90_error |
1.28 s |
Fermi_GBM |
| T90_start |
6:50:15.185 UTC |
Fermi_GBM |
| fluence |
3.68e-05 erg/cm² |
Fermi_GBM |
| fluence_error |
7.64e-08 erg/cm² |
Fermi_GBM |
| T100 |
76.289 s |
|
| GBM_located |
True |
|
| mjd |
55163.28489797454 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB091128285 |
| trigger_name |
bn091128285 |
| ra |
127.6900° |
| decl |
1.7300° |
| pos_error |
2.62e+00° |
| datum |
2009-11-28 |
| t_trigger |
6:50:34.641 UTC |
| T90 |
76.289 s |
| T90_error |
1.28 s |
| T90_start |
6:50:15.185 UTC |
| fluence |
3.68e-05 erg/cm² |
| fluence_error |
7.64e-08 erg/cm² |
| flux_1024 |
9.63e+00 erg/cm²/s |
| flux_1024_error |
3.87e-01 erg/cm²/s |
| flux_1024_time |
1.38e+01 erg/cm²/s |
| flux_64 |
1.47e+01 erg/cm²/s |
| flux_64_error |
1.78e+00 erg/cm²/s |
| GCN 10210 table |
|---|
| GRB_name |
GRB091128A |
| GCN_number |
10210 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
6:50:34.640 UTC |
| ra |
127.7000° |
| decl |
1.7000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 10210
SUBJECT: GRB 091128: Fermi GBM detection
DATE: 09/11/30 14:03:42 GMT
FROM: Andreas von Kienlin at MPE
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:
"At 06:50:34.64 UT on 28 November 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 091128 (trigger 281083836 / 091128285).
The on-ground calculated location, using the GBM trigger
data, is RA = 127.7, DEC = 1.7 (J2000 degrees,
equivalent to 08h 30m, 01d 42'), with an uncertainty
of 1.4 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 96 degrees.
This burst was also independently detected by INTEGRAL SPI-ACS.
The GBM light curve shows one structured peak
with a duration (T90) of 97.0 +/- 1.6 s (8-1000 keV).
The time-averaged spectrum from T0-24.832 s to T0+71.425 s is
best fit by a power law function with an exponential
high energy cutoff. The power law index is -0.99 +/- 0.02
and the cutoff energy, parameterized as Epeak, is 178.8 +/- 5.6 keV
(C-stat 495 for 238 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(37.6 +/- 0.7)E-06 erg/cm^2. The 1.024-sec peak photon flux measured
starting from T0+6.912 s in the 8-1000 keV band
is 9.3 +/- 0.3 ph/s/cm^2.
A Band function fits the spectrum equally well (C-stat 495 for 237 d.o.f.)
with Epeak= 177.4 +/- 6.4 keV, alpha = -0.99 +/- 0.02 and beta = -3.9 +/-
1.5.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|