| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090502777 |
|
| T0 |
18:39:24.920 UTC |
Fermi_GBM |
| ra |
267.8000° |
Fermi_GBM |
| decl |
-20.3000° |
Fermi_GBM |
| pos_error |
5.26e+00° |
Fermi_GBM |
| T90 |
66.048 s |
Fermi_GBM |
| T90_error |
1.619 s |
Fermi_GBM |
| T90_start |
18:39:24.920 UTC |
Fermi_GBM |
| fluence |
3.50e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
2.85e-08 erg/cm² |
Fermi_GBM |
| T100 |
66.048 s |
|
| GBM_located |
True |
|
| mjd |
54953.77737175926 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090502777 |
| trigger_name |
bn090502777 |
| ra |
267.8000° |
| decl |
-20.3000° |
| pos_error |
5.26e+00° |
| datum |
2009-05-02 |
| t_trigger |
18:39:34.648 UTC |
| T90 |
66.048 s |
| T90_error |
1.619 s |
| T90_start |
18:39:24.920 UTC |
| fluence |
3.50e-06 erg/cm² |
| fluence_error |
2.85e-08 erg/cm² |
| flux_1024 |
5.28e+00 erg/cm²/s |
| flux_1024_error |
3.31e-01 erg/cm²/s |
| flux_1024_time |
3.77e+01 erg/cm²/s |
| flux_64 |
8.79e+00 erg/cm²/s |
| flux_64_error |
1.58e+00 erg/cm²/s |
| GCN 9346 table |
|---|
| GRB_name |
GRB090502A |
| GCN_number |
9346 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
18:39:34.640 UTC |
| ra |
267.8000° |
| decl |
-20.3000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9346
SUBJECT: GRB 090502: Fermi GBM detection
DATE: 09/05/11 15:52:55 GMT
FROM: Vandiver Chaplin at UAH/Fermi-GBM
V.Chaplin (UAH) reports on behalf of the
Fermi GBM Team:
"At 18:39:34.64 UT on 02 MAY 2009, the Fermi Gamma-ray
Burst Monitor (GBM) triggered and located GRB 090502
(trigger 262982376 / 090502777). The on-ground calculated
location, using the GBM trigger data, is
RA = 267.8, Dec = -20.3 (J2000 degrees, equivalent to
J2000 17h 51m, -20d 18'), with a statistical uncertainty
of 7.4 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 77 degrees.
The GBM light curve shows a multi-peaked burst with a
duration (T90) of about 66.2 s (8-1000 keV). The
time-averaged spectrum from T0-11.6 to T0+62.1 s
is best fit by a power-law with an exponential cut-off,
with alpha = -1.1 +/- 0.3 and E-peak = 63.2 +/- 8.7 keV,
(chi squared 227.86 for 241 d.o.f.)
The fluence (8-1000 keV) in this time interval is
(3.5 +/- 0.9)E-08 erg/cm^2. The 1-second peak photon
flux starting from T0+37.5 is 6.2 +/- 0.9 ph/s-cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|