| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090427688 |
|
| T0 |
16:30:22.785 UTC |
Fermi_GBM |
| ra |
356.2000° |
Fermi_GBM |
| decl |
-34.6000° |
Fermi_GBM |
| pos_error |
5.83e+00° |
Fermi_GBM |
| T90 |
12.288 s |
Fermi_GBM |
| T90_error |
1.28 s |
Fermi_GBM |
| T90_start |
16:30:22.785 UTC |
Fermi_GBM |
| fluence |
1.62e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
3.18e-08 erg/cm² |
Fermi_GBM |
| T100 |
12.288 s |
|
| GBM_located |
True |
|
| mjd |
54948.68776371528 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090427688 |
| trigger_name |
bn090427688 |
| ra |
356.2000° |
| decl |
-34.6000° |
| pos_error |
5.83e+00° |
| datum |
2009-04-27 |
| t_trigger |
16:30:23.809 UTC |
| T90 |
12.288 s |
| T90_error |
1.28 s |
| T90_start |
16:30:22.785 UTC |
| fluence |
1.62e-06 erg/cm² |
| fluence_error |
3.18e-08 erg/cm² |
| flux_1024 |
2.55e+00 erg/cm²/s |
| flux_1024_error |
2.36e-01 erg/cm²/s |
| flux_1024_time |
5.95e+00 erg/cm²/s |
| flux_64 |
5.03e+00 erg/cm²/s |
| flux_64_error |
1.09e+00 erg/cm²/s |
| GCN 9302 table |
|---|
| GRB_name |
GRB090427C |
| GCN_number |
9302 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
16:30:23.810 UTC |
| ra |
356.2000° |
| decl |
-34.6000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9302
SUBJECT: GRB 090427C: Fermi GBM detection
DATE: 09/04/29 20:28:46 GMT
FROM: Michael S. Briggs at UAH and MSFC
M. S. Briggs (UAH) reports on behalf of the Fermi GBM Team:
"At 16:30:23.81 UT on 27 April 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090427C (trigger 262542625 / 090427688).
The on-ground calculated location, using the GBM trigger
data, is RA = 356.2, DEC = -34.6 (J2000 degrees,
equivalent to 23 h 45 m, -34 d 36'), with an uncertainty
of 5.8 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 81 degrees.
The GBM light curve shows two peaks and has a
duration (T90) of about 12.5 s (8-1000 keV).
The time-averaged spectrum from T0-2.048 s to T0+12.288 s is
well fit by a power law function with an exponential
high energy cutoff. The power law index is 0.35 +/- 0.16 and
the cutoff energy, parameterized as Epeak, is 75 +/- 3 keV.
The event fluence (8-1000 keV) in this time interval is
(1.6 +/- 0.2)E-6 erg/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|