| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB081229187 |
|
| T0 |
4:29:01.624 UTC |
Fermi_GBM |
| ra |
172.6000° |
Fermi_GBM |
| decl |
56.9000° |
Fermi_GBM |
| pos_error |
7.79e+00° |
Fermi_GBM |
| T90 |
0.768 s |
Fermi_GBM |
| T90_error |
0.724 s |
Fermi_GBM |
| T90_start |
4:29:01.624 UTC |
Fermi_GBM |
| fluence |
1.06e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
7.66e-08 erg/cm² |
Fermi_GBM |
| T100 |
0.768 s |
|
| GBM_located |
True |
|
| mjd |
54829.186824351855 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB081229187 |
| trigger_name |
bn081229187 |
| ra |
172.6000° |
| decl |
56.9000° |
| pos_error |
7.79e+00° |
| datum |
2008-12-29 |
| t_trigger |
4:29:01.880 UTC |
| T90 |
0.768 s |
| T90_error |
0.724 s |
| T90_start |
4:29:01.624 UTC |
| fluence |
1.06e-06 erg/cm² |
| fluence_error |
7.66e-08 erg/cm² |
| flux_1024 |
1.88e+00 erg/cm²/s |
| flux_1024_error |
1.21e-01 erg/cm²/s |
| flux_1024_time |
-3.84e-01 erg/cm²/s |
| flux_64 |
5.00e+00 erg/cm²/s |
| flux_64_error |
5.99e-01 erg/cm²/s |
| GCN 8775 table |
|---|
| GRB_name |
GRB081229A |
| GCN_number |
8775 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
4:29:01.880 UTC |
| ra |
170.5000° |
| decl |
55.1000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 8775
SUBJECT: GRB 081229: Fermi GBM detection
DATE: 09/01/03 10:00:27 GMT
FROM: Sheila McBreen at MPE
Sheila McBreen (UCD/MPE) and Elisabetta Bissaldi (MPE)
report on behalf of the Fermi GBM Team:
"At 04:29:01.88 UT on 29 January 2008, the Fermi Gamma-Ray Burst Monitor
triggered and located a short burst GRB 081229 (trigger 252217742 /
081229187).
The on-ground calculated location, using the GBM trigger
data, is RA = 170.5, DEC = 55.1 (J2000 degrees,
equivalent to 11 h 22 m, 55 d 06 '), with an uncertainty
of 8 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 44 degrees.
The GBM light curve consists of one pulse
with a duration of about 0.5 s (8-1000 keV).
The time-averaged spectrum from T0-0.106 s to T0+0.214 s is
adequately fit by a power law function with an exponential
high energy cutoff. The power law index is -0.42 +/- 0.18 and
the cutoff energy, parameterized as Epeak, is 807 +/- 186 keV
(chi squared 437 for 485 d.o.f.).
A Band function fits the spectrum equally well with
Epeak = 585 +/- 188 keV, alpha=-0.27 +/- 0.27
and beta = -2.0 +/- 0.3 (chi squared 429 for 484 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(8.7 +/- 0.8)E-7 erg/cm^2. The 64-ms peak photon flux measured
starting from T0-0.042 s using the Band model in the 8-1000 keV band
is 10.7 +/- 1.5 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|