| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090522344 |
|
| T0 |
8:15:44.462 UTC |
Fermi_GBM |
| ra |
277.7000° |
Fermi_GBM |
| decl |
19.6000° |
Fermi_GBM |
| pos_error |
4.63e+00° |
Fermi_GBM |
| T90 |
20.288 s |
Fermi_GBM |
| T90_error |
6.262 s |
Fermi_GBM |
| T90_start |
8:15:44.462 UTC |
Fermi_GBM |
| fluence |
2.12e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
4.94e-08 erg/cm² |
Fermi_GBM |
| T100 |
20.288 s |
|
| GBM_located |
True |
|
| mjd |
54973.34426460648 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090522344 |
| trigger_name |
bn090522344 |
| ra |
277.7000° |
| decl |
19.6000° |
| pos_error |
4.63e+00° |
| datum |
2009-05-22 |
| t_trigger |
8:15:49.326 UTC |
| T90 |
20.288 s |
| T90_error |
6.262 s |
| T90_start |
8:15:44.462 UTC |
| fluence |
2.12e-06 erg/cm² |
| fluence_error |
4.94e-08 erg/cm² |
| flux_1024 |
3.48e+00 erg/cm²/s |
| flux_1024_error |
2.04e-01 erg/cm²/s |
| flux_1024_time |
9.60e-01 erg/cm²/s |
| flux_64 |
6.06e+00 erg/cm²/s |
| flux_64_error |
8.05e-01 erg/cm²/s |
| GCN 9425 table |
|---|
| GRB_name |
GRB090522A |
| GCN_number |
9425 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
8:15:49.330 UTC |
| ra |
277.7000° |
| decl |
19.6000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9425
SUBJECT: GRB 090522 : Fermi GBM detection
DATE: 09/05/27 12:46:59 GMT
FROM: Sheila McBreen at MPE
Sheila McBreen (UCD/MPE) and Andreas von Kienlin (MPE)
report on behalf of the Fermi GBM Team:
"At 08:15:49.33 UT on 22 May 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090522 (trigger 264672951 / 090522344).
The on-ground calculated location, using the GBM trigger
data, is RA = 277.7, DEC = +19.6 (J2000 degrees,
equivalent to 18 h 31 m, +19 d 36 '), with an uncertainty
of 4.9 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 53 degrees.
The GBM light curve consists of one pulse
with a duration (T90) of about 22 s (8-1000 keV).
The time-averaged spectrum from T0-2 s to T0+20 s is
adequately fit by a power law function with an exponential
high energy cutoff. The power law index is -1.03 (+ 0.41 / -0.53) and
the cutoff energy, parameterized as Epeak, is 75.8 (+36.9 / -15.9) keV
(chi squared 615 for 603 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(1.2 +/- 0.3)E-6 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+2 s in the 8-1000 keV band
is 3.5 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|