| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090409288 |
|
| T0 |
6:53:37.378 UTC |
Fermi_GBM |
| ra |
302.1000° |
Fermi_GBM |
| decl |
1.1000° |
Fermi_GBM |
| pos_error |
7.09e+00° |
Fermi_GBM |
| T90 |
30.337 s |
Fermi_GBM |
| T90_error |
2.796 s |
Fermi_GBM |
| T90_start |
6:53:37.378 UTC |
Fermi_GBM |
| fluence |
1.13e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
5.94e-08 erg/cm² |
Fermi_GBM |
| T100 |
30.337 s |
|
| GBM_located |
True |
|
| mjd |
54930.287238171295 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090409288 |
| trigger_name |
bn090409288 |
| ra |
302.1000° |
| decl |
1.1000° |
| pos_error |
7.09e+00° |
| datum |
2009-04-09 |
| t_trigger |
6:54:01.442 UTC |
| T90 |
30.337 s |
| T90_error |
2.796 s |
| T90_start |
6:53:37.378 UTC |
| fluence |
1.13e-06 erg/cm² |
| fluence_error |
5.94e-08 erg/cm² |
| flux_1024 |
1.60e+00 erg/cm²/s |
| flux_1024_error |
1.44e-01 erg/cm²/s |
| flux_1024_time |
2.24e+00 erg/cm²/s |
| flux_64 |
3.69e+00 erg/cm²/s |
| flux_64_error |
7.94e-01 erg/cm²/s |
| GCN 9119 table |
|---|
| GRB_name |
GRB090409A |
| GCN_number |
9119 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
6:54:01.440 UTC |
| ra |
302.1000° |
| decl |
1.1000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9119
SUBJECT: GRB 090409: Fermi GBM detection
DATE: 09/04/09 17:03:04 GMT
FROM: Elisabetta Bissaldi at MPE
E. Bissaldi (MPE) reports on behalf of the Fermi GBM Team:
"At 06:54:01.44 UT on 09 April 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090409 (trigger 260952843 / 090409288).
The on-ground calculated location, using the GBM trigger
data, is RA = 302.1, DEC = +1.1 (J2000 degrees,
equivalent to 20h 08m, 01d 06'), with an uncertainty
of 7.9 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 90 degrees.
This weak and long GRB consists of a single peak
with a duration (T90) of about 20 s (8-1000 keV).
The time-averaged spectrum from T0 to T0+5.1 s is
adequately fit by a power law function with an exponential
high energy cutoff. The power law index is 1.2 +/- 0.7 and
the cutoff energy, parameterized as Epeak, is 137 +/- 17 keV
(chi squared 346 for 356 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(6.14 +/- 0.26)E-07 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+4 s in the 8-1000 keV band
is 1.36 +/- 0.14 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|