| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090520832 |
|
| T0 |
19:57:53.528 UTC |
Fermi_GBM |
| ra |
332.0000° |
Fermi_GBM |
| decl |
43.2000° |
Fermi_GBM |
| pos_error |
7.33e+00° |
Fermi_GBM |
| T90 |
0.768 s |
Fermi_GBM |
| T90_error |
0.834 s |
Fermi_GBM |
| T90_start |
19:57:53.528 UTC |
Fermi_GBM |
| fluence |
2.32e-07 erg/cm² |
Fermi_GBM |
| fluence_error |
2.52e-08 erg/cm² |
Fermi_GBM |
| T100 |
0.768 s |
|
| GBM_located |
True |
|
| mjd |
54971.83186953704 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090520832 |
| trigger_name |
bn090520832 |
| ra |
332.0000° |
| decl |
43.2000° |
| pos_error |
7.33e+00° |
| datum |
2009-05-20 |
| t_trigger |
19:57:53.976 UTC |
| T90 |
0.768 s |
| T90_error |
0.834 s |
| T90_start |
19:57:53.528 UTC |
| fluence |
2.32e-07 erg/cm² |
| fluence_error |
2.52e-08 erg/cm² |
| flux_1024 |
2.03e+00 erg/cm²/s |
| flux_1024_error |
1.90e-01 erg/cm²/s |
| flux_1024_time |
-4.48e-01 erg/cm²/s |
| flux_64 |
5.76e+00 erg/cm²/s |
| flux_64_error |
1.01e+00 erg/cm²/s |
| GCN 9427 table |
|---|
| GRB_name |
GRB090520B |
| GCN_number |
9427 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
19:57:53.980 UTC |
| ra |
332.0000° |
| decl |
43.2000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9427
SUBJECT: GRB 090520B: Fermi GBM detection
DATE: 09/05/28 13:19:11 GMT
FROM: Narayana Bhat at U Alabama/Huntsville/GBM
P. N. Bhat (UAH)
report on behalf of the Fermi GBM Team:
"At 19:57:53.98 UT on 20 May 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090520B (trigger 264542275 / 090520832).
[which was the second GRB trigger of the day while the first was
detected by the Swift-BAT (Cummings et al. 2008, GCN 9417)]
The on-ground calculated location, using the GBM trigger
data, is RA = 332.0, DEC = 43.2 (J2000 degrees,
equivalent to 22 h 08 m, 43 d 12'), with an uncertainty
of 12 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 10 degrees.
The GBM light curve consists of a single pulse
with a duration (T90) of about 1.5 s (8-1000 keV).
The time-averaged spectrum from T0-0.384 s to T0+0.256 s is
adequately fit by a simple power law function with index -1.4 +/- 0.1
(chi squared 98 for 122 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(4.5 +/- 0.2)E-7 erg/cm^2. The 1-sec peak photon flux measured
starting from T0 s in the 8-1000 keV band
is 4.1 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|