| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB091030828 |
|
| T0 |
19:52:26.860 UTC |
GCN_circulars,Fermi GBM Det |
| ra |
41.6700° |
Fermi_GBM |
| decl |
21.5400° |
Fermi_GBM |
| pos_error |
2.83e+00° |
Fermi_GBM |
| T90 |
98.05 s |
Fermi_GBM |
| T90_error |
4.128 s |
Fermi_GBM |
| T90_start |
19:52:27.695 UTC |
Fermi_GBM |
| fluence |
2.96e-05 erg/cm² |
Fermi_GBM |
| fluence_error |
2.02e-07 erg/cm² |
Fermi_GBM |
| T100 |
98.885 s |
|
| GBM_located |
True |
|
| mjd |
55134.82808865741 |
GCN_circulars,Fermi GBM Det |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB091030828 |
| trigger_name |
bn091030828 |
| ra |
41.6700° |
| decl |
21.5400° |
| pos_error |
2.83e+00° |
| datum |
2009-10-30 |
| t_trigger |
19:52:26.863 UTC |
| T90 |
98.05 s |
| T90_error |
4.128 s |
| T90_start |
19:52:27.695 UTC |
| fluence |
2.96e-05 erg/cm² |
| fluence_error |
2.02e-07 erg/cm² |
| flux_1024 |
9.40e+00 erg/cm²/s |
| flux_1024_error |
2.25e-01 erg/cm²/s |
| flux_1024_time |
1.77e+01 erg/cm²/s |
| flux_64 |
1.20e+01 erg/cm²/s |
| flux_64_error |
9.21e-01 erg/cm²/s |
| GCN 10146 table |
|---|
| GRB_name |
GRB091030A |
| GCN_number |
10146 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
19:52:26.860 UTC |
| ra |
41.6700° |
| decl |
21.5400° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 10146
SUBJECT: GRB 091030: Fermi GBM detection
DATE: 09/11/09 16:25:41 GMT
FROM: Michael Burgess at UAH
J. Michael Burgess (UAH) and Sylvain Guiriec (UAH)
report on behalf of the Fermi GBM Team:
"At 19:52:26.86 UT on 30 October 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 091030 (trigger 278625148 / 091030828).
The on-ground calculated location, using the GBM trigger
data, is RA = 41.67, DEC = 21.54 (J2000 degrees,
equivalent to 17h 40m 12, 21d 32'), with an uncertainty
of 1.2 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 100 degrees.
The GBM light curve consists of 2 bright peaks followed
by 2 dimmer peaks.
with a duration (T90) of about 160 s (8-1000 keV).
The time-averaged spectrum from T0-1.7 s to T0+40 s is
best fit by a Band function with Epeak = 507 +/- 30 keV,
alpha = -0.88 +/- 0.02, and beta = -2.2 +/- 0.1 (castor C-stat 626 for
478 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(3.03 +/- 0.043) E-5 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+17.54 s in the 8-1000 keV band
is 9.58 +/- 0.23 ph/s/cm^2.
The spectral and temporal analysis results presented above are
preliminary;
final results will be published in the GBM GRB Catalog."
|