| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB081122520 |
|
| T0 |
12:28:11.955 UTC |
Fermi_GBM |
| ra |
339.1000° |
Fermi_GBM |
| decl |
40.0000° |
Fermi_GBM |
| pos_error |
2.60e+00° |
Fermi_GBM |
| T90 |
23.296 s |
Fermi_GBM |
| T90_error |
2.111 s |
Fermi_GBM |
| T90_start |
12:28:11.955 UTC |
Fermi_GBM |
| fluence |
7.54e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
7.85e-08 erg/cm² |
Fermi_GBM |
| T100 |
23.296 s |
|
| GBM_located |
True |
|
| mjd |
54792.5195828125 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB081122520 |
| trigger_name |
bn081122520 |
| ra |
339.1000° |
| decl |
40.0000° |
| pos_error |
2.60e+00° |
| datum |
2008-11-22 |
| t_trigger |
12:28:12.211 UTC |
| T90 |
23.296 s |
| T90_error |
2.111 s |
| T90_start |
12:28:11.955 UTC |
| fluence |
7.54e-06 erg/cm² |
| fluence_error |
7.85e-08 erg/cm² |
| flux_1024 |
1.22e+01 erg/cm²/s |
| flux_1024_error |
2.38e-01 erg/cm²/s |
| flux_1024_time |
3.84e-01 erg/cm²/s |
| flux_64 |
2.15e+01 erg/cm²/s |
| flux_64_error |
1.11e+00 erg/cm²/s |
| GCN 8549 table |
|---|
| GRB_name |
GRB081122A |
| GCN_number |
8549 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
12:28:12.210 UTC |
| ra |
338.7000° |
| decl |
38.4000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 8549
SUBJECT: GRB 081122: Fermi GBM detection
DATE: 08/11/24 17:05:13 GMT
FROM: Sheila McBreen at MPE
Sheila McBreen (UCD/MPE) reports on behalf of the
Fermi GBM Team:
"At 12:28:12.21 UT on 22 November 2008, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 081122 (trigger 249049693 / 081122520).
The on-ground calculated location, using the GBM trigger
data, is RA = 338.7, DEC = +38.4 (J2000 degrees,
equivalent to 22 h 35 m, +38 d 24 '), 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 21 degrees.
This event generated an Autonomous Repoint Recommendation from GBM,
which was accepted by the LAT and spacecraft. A 5 hour pointed mode
observation was initiated at the location of this burst.
The GBM light curve consists of 3 pulses
with a duration (T90) of about 26 s (8-1000 keV).
The time-averaged spectrum from T0-1 s to T0+26 s is
adequately fit by a power law function with an exponential
high energy cutoff. The power law index is -0.77 +/-0.07 and
the cutoff energy, parameterized as Epeak, is 200.7 +/-15.7 keV
(chi squared 431.7 for 353 d.o.f.).
A Band function fits the spectrum equally well
(chi squared 431.3 for 352 d.o.f.) with Epeak = 158.6 +/- 17.6 keV,
alpha = -0.63 +/- 0.15 , and beta = -2.24 +/- 0.20.
The event fluence (8-1000 keV) in this time interval is
(9.6 +/- 1.1) E-6 erg/cm^2 (Band model). The 64 ms
peak photon flux measured starting from T0+0.756 s
in the 8-1000 keV band is 30.0 +/- 3.0 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|