| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090429753 |
|
| T0 |
18:03:57.320 UTC |
Fermi_GBM |
| ra |
125.2100° |
Fermi_GBM |
| decl |
6.2000° |
Fermi_GBM |
| pos_error |
4.98e+00° |
Fermi_GBM |
| T90 |
0.64 s |
Fermi_GBM |
| T90_error |
0.466 s |
Fermi_GBM |
| T90_start |
18:03:57.320 UTC |
Fermi_GBM |
| fluence |
1.12e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
4.33e-08 erg/cm² |
Fermi_GBM |
| T100 |
0.64 s |
|
| GBM_located |
True |
|
| mjd |
54950.75274675926 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090429753 |
| trigger_name |
bn090429753 |
| ra |
125.2100° |
| decl |
6.2000° |
| pos_error |
4.98e+00° |
| datum |
2009-04-29 |
| t_trigger |
18:03:57.512 UTC |
| T90 |
0.64 s |
| T90_error |
0.466 s |
| T90_start |
18:03:57.320 UTC |
| fluence |
1.12e-06 erg/cm² |
| fluence_error |
4.33e-08 erg/cm² |
| flux_1024 |
3.90e+00 erg/cm²/s |
| flux_1024_error |
1.54e-01 erg/cm²/s |
| flux_1024_time |
-3.84e-01 erg/cm²/s |
| flux_64 |
8.62e+00 erg/cm²/s |
| flux_64_error |
8.26e-01 erg/cm²/s |
| GCN 9311 table |
|---|
| GRB_name |
GRB090429D |
| GCN_number |
9311 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
18:03:57.510 UTC |
| ra |
125.2000° |
| decl |
6.2000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9311
SUBJECT: GRB 090429D: Fermi GBM detection
DATE: 09/04/30 22:09:24 GMT
FROM: Narayana Bhat at U Alabama/Huntsville/GBM
P. N. Bhat (UAH) reports on behalf of the Fermi GBM Team:
"At 18:03:57.51 UT on 29 April 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090429D (trigger 262721039 / 090429753).
The on-ground calculated location, using the GBM trigger
data, is RA = 125.2, DEC = 6.2 (J2000 degrees,
equivalent to 08 h 20.8 m, 06 d 12'), with an uncertainty
of 4.6 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 33 degrees.
[This burst was also independently detected by Konus Wind. Swift BAT
confirms this GRB which occurred while it was slewing.]
The GBM light curve consists of 3 short pulses (two which occurred before
the trigger) with a duration (T90) of about 11 s (8-1000 keV).
The time-averaged spectrum from T0-13.248 s to T0+1.088 s is
adequately fit by a power law function with an exponential
high energy cutoff. The power law index is -0.87 +/- 0.27 and
the cutoff energy, parametrized as Epeak, is 223 +/- 72.5 keV
(chi squared 459 for 487 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(1.6 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0 s in the 8-1000 keV band
is 0.86 +/- 0.16 ph/s/cm^2.
[A Band function fits the spectrum equally well (chi squared 456 for 486
d.o.f.) with Epeak= 152.8 +/- 92.4 keV, alpha = -0.66 +/- 0.53 and beta =
-1.88+/- 0.32.]
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|