| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090828099 |
|
| T0 |
2:22:47.175 UTC |
Fermi_GBM |
| ra |
124.3800° |
Fermi_GBM |
| decl |
-26.1400° |
Fermi_GBM |
| pos_error |
2.72e+00° |
Fermi_GBM |
| T90 |
68.417 s |
Fermi_GBM |
| T90_error |
3.167 s |
Fermi_GBM |
| T90_start |
2:22:47.175 UTC |
Fermi_GBM |
| fluence |
2.37e-05 erg/cm² |
Fermi_GBM |
| fluence_error |
1.86e-07 erg/cm² |
Fermi_GBM |
| T100 |
68.417 s |
|
| GBM_located |
True |
|
| mjd |
55071.09915711806 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090828099 |
| trigger_name |
bn090828099 |
| ra |
124.3800° |
| decl |
-26.1400° |
| pos_error |
2.72e+00° |
| datum |
2009-08-28 |
| t_trigger |
2:22:48.199 UTC |
| T90 |
68.417 s |
| T90_error |
3.167 s |
| T90_start |
2:22:47.175 UTC |
| fluence |
2.37e-05 erg/cm² |
| fluence_error |
1.86e-07 erg/cm² |
| flux_1024 |
1.45e+01 erg/cm²/s |
| flux_1024_error |
3.02e-01 erg/cm²/s |
| flux_1024_time |
5.28e+01 erg/cm²/s |
| flux_64 |
1.65e+01 erg/cm²/s |
| flux_64_error |
1.20e+00 erg/cm²/s |
| GCN 9844 table |
|---|
| GRB_name |
GRB090828A |
| GCN_number |
9844 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
2:22:48.200 UTC |
| ra |
124.4000° |
| decl |
-26.1000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9844
SUBJECT: GRB 090828: Fermi GBM detection
DATE: 09/08/28 17:12:22 GMT
FROM: Sheila McBreen at MPE
S. McBreen (UCD/MPE)
reports on behalf of the Fermi GBM Team:
"At 02:22:48.20 UT on 28 August 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090828 (trigger 273118970 / 090828099 ).
The on-ground calculated location, using the GBM trigger
data, is RA = 124.4, DEC = -26.1 (J2000 degrees,
equivalent to 08 h 18 m, -26 d 06 '), with an uncertainty
of 1.2 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 95 degrees.
This burst was also independently detected by INTEGRAL SPI-ACS.
The GBM light curve consists of three pulses
with a duration (T90) of about 100 s (8-1000 keV).
The time-averaged spectrum from T0-0 s to T0+103 s is
well fit by
a Band function with Epeak = 136.5 (+16.0/-13.7) keV,
alpha = -1.23 (+0.06/-0.05), and beta = -2.12 (+0.08/-0.11)
(chi squared 549 for 485 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(2.52 +/- 0.08)E-5 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+52.2 s in the 8-1000 keV band
is 16.2 +/- 0.5 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|