| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090427644 |
|
| T0 |
15:26:59.064 UTC |
Fermi_GBM |
| ra |
210.0000° |
Fermi_GBM |
| decl |
-45.7000° |
Fermi_GBM |
| pos_error |
8.38e+00° |
Fermi_GBM |
| T90 |
1.024 s |
Fermi_GBM |
| T90_error |
0.362 s |
Fermi_GBM |
| T90_start |
15:26:59.064 UTC |
Fermi_GBM |
| fluence |
2.65e-07 erg/cm² |
Fermi_GBM |
| fluence_error |
2.22e-08 erg/cm² |
Fermi_GBM |
| T100 |
1.024 s |
|
| GBM_located |
True |
|
| mjd |
54948.64373916667 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090427644 |
| trigger_name |
bn090427644 |
| ra |
210.0000° |
| decl |
-45.7000° |
| pos_error |
8.38e+00° |
| datum |
2009-04-27 |
| t_trigger |
15:27:00.856 UTC |
| T90 |
1.024 s |
| T90_error |
0.362 s |
| T90_start |
15:26:59.064 UTC |
| fluence |
2.65e-07 erg/cm² |
| fluence_error |
2.22e-08 erg/cm² |
| flux_1024 |
1.71e+00 erg/cm²/s |
| flux_1024_error |
1.46e-01 erg/cm²/s |
| flux_1024_time |
-1.73e+00 erg/cm²/s |
| flux_64 |
2.97e+00 erg/cm²/s |
| flux_64_error |
8.25e-01 erg/cm²/s |
| GCN 9301 table |
|---|
| GRB_name |
GRB090427B |
| GCN_number |
9301 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
15:27:00.860 UTC |
| ra |
210.0000° |
| decl |
-45.7000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9301
SUBJECT: GRB 090427B: Fermi GBM detection
DATE: 09/04/29 20:24:39 GMT
FROM: Michael S. Briggs at UAH and MSFC
M. S. Briggs (UAH) reports on behalf of the Fermi GBM Team:
"At 15:27:00.86 UT on 27 April 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090427B (trigger 262538822 / 090427644).
The on-ground calculated location, using the GBM trigger
data, is RA = 210.0, DEC = -45.7 (J2000 degrees,
equivalent to 14 h 00 m, -45 d 42'), with an uncertainty
of 11.8 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 14 degrees.
The GBM light curve consists of a single peak
with a duration about 7 s (8-1000 keV).
The time-averaged spectrum from T0-4.096 s to T0+2.048 s is
well fit by a simple power law function with
index -1.1 +/- 0.1.
The event fluence (8-1000 keV) in this time interval is
(8.0 +/- 0.5)E-7 erg/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|