| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090520850 |
|
| T0 |
20:23:18.924 UTC |
Fermi_GBM |
| ra |
111.2000° |
Fermi_GBM |
| decl |
-19.7000° |
Fermi_GBM |
| pos_error |
2.98e+00° |
Fermi_GBM |
| T90 |
3.776 s |
Fermi_GBM |
| T90_error |
0.923 s |
Fermi_GBM |
| T90_start |
20:23:18.924 UTC |
Fermi_GBM |
| fluence |
3.32e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
1.04e-07 erg/cm² |
Fermi_GBM |
| T100 |
3.776 s |
|
| GBM_located |
True |
|
| mjd |
54971.84952458333 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090520850 |
| trigger_name |
bn090520850 |
| ra |
111.2000° |
| decl |
-19.7000° |
| pos_error |
2.98e+00° |
| datum |
2009-05-20 |
| t_trigger |
20:23:19.308 UTC |
| T90 |
3.776 s |
| T90_error |
0.923 s |
| T90_start |
20:23:18.924 UTC |
| fluence |
3.32e-06 erg/cm² |
| fluence_error |
1.04e-07 erg/cm² |
| flux_1024 |
5.23e+00 erg/cm²/s |
| flux_1024_error |
2.05e-01 erg/cm²/s |
| flux_1024_time |
1.54e+00 erg/cm²/s |
| flux_64 |
9.53e+00 erg/cm²/s |
| flux_64_error |
1.06e+00 erg/cm²/s |
| GCN 9428 table |
|---|
| GRB_name |
GRB090520C |
| GCN_number |
9428 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
20:23:19.310 UTC |
| ra |
111.2000° |
| decl |
-19.7000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9428
SUBJECT: GRB 090520C: Fermi GBM detection
DATE: 09/05/28 13:32:02 GMT
FROM: Narayana Bhat at U Alabama/Huntsville/GBM
P. N. Bhat (UAH)
report on behalf of the Fermi GBM Team:
"At 20:23:19.31 UT on 20 May 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090520C (trigger 264543801 / 090520850).
The on-ground calculated location, using the GBM trigger
data, is RA = 111.2, DEC = -19.7 (J2000 degrees,
equivalent to 07 h 24.8 m, -19 d 42'), 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 71 degrees.
The GBM light curve consists of single peak
with a duration (T90) of about 4.9 s (10-1000 keV).
The time-averaged spectrum from T0-0.512 s to T0+3.968 s is
adequately fit by a Band function with Epeak = 204.2 +/- 27.9 keV,
alpha = -0.73 +/- 0.09, and beta = -1.96 +/- 0.10
(chi squared 400.9for 362 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(3.54 +/- 0.25)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+0.872 s in the 8-1000 keV band
is 4.47 +/- 0.32 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|