| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090301315 |
|
| T0 |
7:33:20.314 UTC |
Fermi_GBM |
| ra |
352.8000° |
Fermi_GBM |
| decl |
9.5000° |
Fermi_GBM |
| pos_error |
4.72e+00° |
Fermi_GBM |
| T90 |
23.296 s |
Fermi_GBM |
| T90_error |
2.064 s |
Fermi_GBM |
| T90_start |
7:33:20.314 UTC |
Fermi_GBM |
| fluence |
2.27e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
3.78e-08 erg/cm² |
Fermi_GBM |
| T100 |
23.296 s |
|
| GBM_located |
True |
|
| mjd |
54891.31481844907 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090301315 |
| trigger_name |
bn090301315 |
| ra |
352.8000° |
| decl |
9.5000° |
| pos_error |
4.72e+00° |
| datum |
2009-03-01 |
| t_trigger |
7:33:37.978 UTC |
| T90 |
23.296 s |
| T90_error |
2.064 s |
| T90_start |
7:33:20.314 UTC |
| fluence |
2.27e-06 erg/cm² |
| fluence_error |
3.78e-08 erg/cm² |
| flux_1024 |
3.72e+00 erg/cm²/s |
| flux_1024_error |
1.76e-01 erg/cm²/s |
| flux_1024_time |
1.60e+00 erg/cm²/s |
| flux_64 |
5.01e+00 erg/cm²/s |
| flux_64_error |
8.10e-01 erg/cm²/s |
| GCN 8922 table |
|---|
| GRB_name |
GRB090301B |
| GCN_number |
8922 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
7:33:37.980 UTC |
| ra |
350.3000° |
| decl |
9.0000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 8922
SUBJECT: GRB 090301B: Fermi GBM detection
DATE: 09/03/01 16:38:46 GMT
FROM: Andreas von Kienlin at MPE
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:
"At 07:33:37.98 UT on 01 March 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090301B (trigger 257585619 / 090301315 ).
The on-ground calculated location, using the GBM trigger
data, is RA = 350.3, DEC = 9.0 (J2000 degrees,
equivalent to 23h 21m, 09d 00'), with an uncertainty
of 4.2 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 56 degrees.
The GBM light curve shows a single peak lasting about 5 s
superimposed on a lower-level continuum.
The burst duration (T90) is about 28 s (8-1000 keV)
The time-averaged spectrum from T0-1.536 s to T0+3.584 s is
well fit by a power law function with an exponential
high energy cutoff. The power law index is -1.03 +/- 0.09 and
the cutoff energy, parameterized as Epeak, is 546 +/- 133 keV
(chi squared 703.17 for 731 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(2.69 +/- 0.13)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+1.536 s in the 8-1000 keV band
is 4.4 +/- 0.1 ph/s/cm^2.
A Band function fits the spectrum equally well
(chi squared 700.28 for 730 d.o.f.) with Epeak= 427 +/- 147 keV,
alpha = -0.98 +/- 0.12 and beta = -1.93 +/- 0.24.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|