| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090621417 |
|
| T0 |
10:00:48.256 UTC |
Fermi_GBM |
| ra |
257.4900° |
Fermi_GBM |
| decl |
-28.4600° |
Fermi_GBM |
| pos_error |
6.93e+00° |
Fermi_GBM |
| T90 |
27.009 s |
Fermi_GBM |
| T90_error |
6.136 s |
Fermi_GBM |
| T90_start |
10:00:48.256 UTC |
Fermi_GBM |
| fluence |
3.82e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
1.10e-07 erg/cm² |
Fermi_GBM |
| T100 |
27.009 s |
|
| GBM_located |
True |
|
| mjd |
55003.417225185185 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090621417 |
| trigger_name |
bn090621417 |
| ra |
257.4900° |
| decl |
-28.4600° |
| pos_error |
6.93e+00° |
| datum |
2009-06-21 |
| t_trigger |
10:00:52.096 UTC |
| T90 |
27.009 s |
| T90_error |
6.136 s |
| T90_start |
10:00:48.256 UTC |
| fluence |
3.82e-06 erg/cm² |
| fluence_error |
1.10e-07 erg/cm² |
| flux_1024 |
3.67e+00 erg/cm²/s |
| flux_1024_error |
3.70e-01 erg/cm²/s |
| flux_1024_time |
1.97e+01 erg/cm²/s |
| flux_64 |
6.45e+00 erg/cm²/s |
| flux_64_error |
7.99e-01 erg/cm²/s |
| GCN 9558 table |
|---|
| GRB_name |
GRB090621C |
| GCN_number |
9558 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
10:00:52.100 UTC |
| ra |
257.5000° |
| decl |
-28.5000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9558
SUBJECT: GRB 090621C: Fermi GBM detection
DATE: 09/06/22 19:42:15 GMT
FROM: Arne Rau at MPE
Arne Rau (MPE) reports on behalf of the Fermi GBM Team:
"At 10:00:52.10 UT on 21 June 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090621C (trigger 267271254 / 090621417).
The on-ground calculated location, using the GBM trigger
data, is RA = 257.5 deg, DEC = -28.5 deg (J2000 degrees,
equivalent to 17 h 10 m, -28 d 28 '), with an uncertainty
of 3.3 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 52 degrees.
The GBM light curve consists of multiple short peaks
with a duration (T90) of about 59.9 s (8-1000 keV).
The time-averaged spectrum from T0-3.072 s to T0+28.672 s is
well fit by a power law function with an exponential
high energy cutoff. The power law index is -1.4 +/- 0.1 and
the cutoff energy, parameterized as Epeak, is 148 +/- 34 keV
(chi squared 444 for 461 d.o.f.).
The event fluence (8-1000 keV) in the above mentioned time interval is
(1.8 +/- 0.2)E-06 erg/cm^2. The 1.024-sec peak photon flux measured
starting from T0+4.096 s in the 8-1000 keV band
is 2.29 +/- 0.06 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|