| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090520876 |
|
| T0 |
21:01:18.969 UTC |
Fermi_GBM |
| ra |
131.3000° |
Fermi_GBM |
| decl |
-18.0000° |
Fermi_GBM |
| pos_error |
3.83e+00° |
Fermi_GBM |
| T90 |
30.657 s |
Fermi_GBM |
| T90_error |
0.859 s |
Fermi_GBM |
| T90_start |
21:01:18.969 UTC |
Fermi_GBM |
| fluence |
6.18e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
3.88e-08 erg/cm² |
Fermi_GBM |
| T100 |
30.657 s |
|
| GBM_located |
True |
|
| mjd |
54971.875913993055 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090520876 |
| trigger_name |
bn090520876 |
| ra |
131.3000° |
| decl |
-18.0000° |
| pos_error |
3.83e+00° |
| datum |
2009-05-20 |
| t_trigger |
21:01:37.145 UTC |
| T90 |
30.657 s |
| T90_error |
0.859 s |
| T90_start |
21:01:18.969 UTC |
| fluence |
6.18e-06 erg/cm² |
| fluence_error |
3.88e-08 erg/cm² |
| flux_1024 |
8.80e+00 erg/cm²/s |
| flux_1024_error |
2.32e-01 erg/cm²/s |
| flux_1024_time |
2.05e+00 erg/cm²/s |
| flux_64 |
1.08e+01 erg/cm²/s |
| flux_64_error |
1.06e+00 erg/cm²/s |
| GCN 9429 table |
|---|
| GRB_name |
GRB090520D |
| GCN_number |
9429 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
21:01:37.140 UTC |
| ra |
131.3000° |
| decl |
-18.0000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9429
SUBJECT: GRB 090520D: Fermi GBM detection
DATE: 09/05/28 13:45:04 GMT
FROM: Narayana Bhat at U Alabama/Huntsville/GBM
P. N. Bhat (UAH)
reports on behalf of the Fermi GBM Team:
"At 21:01:37.14 UT on 20 May 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090520D (trigger 264546099 / 090520876).
The on-ground calculated location, using the GBM trigger
data, is RA = 131.3, DEC = -18.0 (J2000 degrees,
equivalent to 08 h 45.2 m, -18 d 0'), with an uncertainty
of 4.3 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 66 degrees.
The GBM light curve consists of single pulse
with a duration (T90) of about 12 s (8-1000 keV).
The time-averaged spectrum from T0-5.12 s to T0+13.3 s is
adequately fit by
a power law function with an exponential
high energy cutoff. The power law index is -1.03 +/- 0.22 and
the cutoff energy, parameterized as Epeak, is 47.4 +/- 4.1 keV
(chi squared 354 for 363 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(4.0 +/- 0.9)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+2.0 s in the 8-1000 keV band
is 4.1 +/- 1.0 ph/s/cm^2.
A Band function fits the spectrum equally well (chi squared 353.8 for 362
d.o.f.)
with Epeak= 46.3 +/- 5.3 keV, alpha = -0.99 +/- 0.28 and beta = -3.25 +/-
1.23.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|