| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090815438 |
|
| T0 |
10:30:32.633 UTC |
Fermi_GBM |
| ra |
21.4200° |
Fermi_GBM |
| decl |
53.4400° |
Fermi_GBM |
| pos_error |
4.88e+00° |
Fermi_GBM |
| T90 |
30.465 s |
Fermi_GBM |
| T90_error |
3.566 s |
Fermi_GBM |
| T90_start |
10:30:32.633 UTC |
Fermi_GBM |
| fluence |
4.47e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
3.96e-08 erg/cm² |
Fermi_GBM |
| T100 |
30.465 s |
|
| GBM_located |
True |
|
| mjd |
55058.43787769676 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090815438 |
| trigger_name |
bn090815438 |
| ra |
21.4200° |
| decl |
53.4400° |
| pos_error |
4.88e+00° |
| datum |
2009-08-15 |
| t_trigger |
10:30:41.849 UTC |
| T90 |
30.465 s |
| T90_error |
3.566 s |
| T90_start |
10:30:32.633 UTC |
| fluence |
4.47e-06 erg/cm² |
| fluence_error |
3.96e-08 erg/cm² |
| flux_1024 |
1.12e+01 erg/cm²/s |
| flux_1024_error |
3.80e-01 erg/cm²/s |
| flux_1024_time |
1.68e+01 erg/cm²/s |
| flux_64 |
1.31e+01 erg/cm²/s |
| flux_64_error |
1.77e+00 erg/cm²/s |
| GCN 9813 table |
|---|
| GRB_name |
GRB090815B |
| GCN_number |
9813 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
10:30:41.850 UTC |
| ra |
21.4000° |
| decl |
53.4000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9813
SUBJECT: GRB 090815B: Fermi GBM detection
DATE: 09/08/15 14:48:04 GMT
FROM: Andreas von Kienlin at MPE
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:
"At 10:30:41.85 UT on 15 August 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090815B (trigger 272025043 / Y090815438).
The on-ground calculated location, using the GBM trigger data,
is RA = 21.4, DEC = 53.4 (J2000 degrees, equivalent to 01h 26m, 53d 24'),
with an uncertainty of 5.7 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 82 degrees.
The GBM light curve consists of two peaks with a duration (T90)
of about 30 s (8-1000 keV). The time-averaged spectrum from
T0-7.168 s to T0+23.552 s is well fit by a power law function
with an exponential high energy cutoff. The power law index
is -1.89 +/- 0.12 and the cutoff energy, parameterized as Epeak,
is 15.1 +/- 10.8 keV (chi squared 297 for 238 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(5.05 +/- 0.25)E-06 erg/cm^2. The 1.024-sec peak photon flux measured
starting from T0+16.384 s in the 8-1000 keV band
is 14.4 +/- 0.5 ph/s/cm^2.
A Band function fits the spectrum equally well (chi squared 296
for 237 d.o.f.) with Epeak= 18.6 +/- 9.6 keV, alpha = -1.82 +/- 0.19
and beta = -2.7 +/- 0.4.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|