| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090718762 |
|
| T0 |
18:17:42.840 UTC |
GCN_circulars,Fermi GBM Det |
| ra |
274.1200° |
Fermi_GBM |
| decl |
-36.3900° |
Fermi_GBM |
| pos_error |
2.65e+00° |
Fermi_GBM |
| T90 |
23.744 s |
Fermi_GBM |
| T90_error |
0.802 s |
Fermi_GBM |
| T90_start |
18:17:46.233 UTC |
Fermi_GBM |
| fluence |
2.50e-05 erg/cm² |
Fermi_GBM |
| fluence_error |
1.19e-07 erg/cm² |
Fermi_GBM |
| T100 |
27.137 s |
|
| GBM_located |
True |
|
| mjd |
55030.76230138889 |
GCN_circulars,Fermi GBM Det |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090718762 |
| trigger_name |
bn090718762 |
| ra |
274.1200° |
| decl |
-36.3900° |
| pos_error |
2.65e+00° |
| datum |
2009-07-18 |
| t_trigger |
18:17:42.841 UTC |
| T90 |
23.744 s |
| T90_error |
0.802 s |
| T90_start |
18:17:46.233 UTC |
| fluence |
2.50e-05 erg/cm² |
| fluence_error |
1.19e-07 erg/cm² |
| flux_1024 |
2.90e+01 erg/cm²/s |
| flux_1024_error |
3.33e-01 erg/cm²/s |
| flux_1024_time |
2.15e+01 erg/cm²/s |
| flux_64 |
3.22e+01 erg/cm²/s |
| flux_64_error |
1.33e+00 erg/cm²/s |
| GCN 9690 table |
|---|
| GRB_name |
GRB090718B |
| GCN_number |
9690 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
18:17:42.840 UTC |
| ra |
274.1000° |
| decl |
-36.4000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9690
SUBJECT: GRB 090718B: Fermi GBM detection
DATE: 09/07/20 14:49:19 GMT
FROM: Alexander van der Horst at NASA/MSFC
A.J. van der Horst (NASA/MSFC/ORAU) reports on behalf of the Fermi GBM
Team:
"At 18:17:42.84 UT on 18 July 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090718B (trigger 269633864 / 090718762).
The on-ground calculated location, using the GBM trigger data, is
RA = 274.1, DEC = -36.4 (J2000 degrees, equivalent to 18h16m, -36d23'),
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 76 degrees.
The GBM light curve consists of several peaks with
a duration (T90) of about 28 s (8-1000 keV).
The time-averaged spectrum from T0 to T0+29.7 s is well fit by
a power law function with an exponential high energy cutoff. The
power law index is -1.21 +/- 0.02 and the cutoff energy, parameterized
as Epeak, is 198 +/- 9 keV (chi squared 507 for 480 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(2.52 +/- 0.05)E-5 erg/cm^2. The 1-sec peak photon flux
measured starting from T0+21.5 s in the 8-1000 keV band
is 32.0 +/- 0.5 ph/s/cm^2.
A Band function fits the spectrum equally well (chi squared 504 for
479 d.o.f.) with Epeak = 184 +/- 9 keV, alpha = -1.18 +/- 0.03 and
beta = -2.59 +/- 0.26.
The temporal and spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|
| GCN 9703 table |
|---|
| GRB_name |
GRB090718B |
| GCN_number |
9703 |
| Detection_method |
Konus-Wind Det |
| t_trigger |
18:17:43.878 UTC |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9703
SUBJECT: Konus-RF and Konus-Wind observations of GRB 090718B
DATE: 09/07/24 11:08:04 GMT
FROM: Dmitry Frederiks at Ioffe Institute
S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin,
P. Oleynik, M. Ulanov, and D. Svinkin on behalf of
the Konus-Wind and Konus-RF teams, and
T. Cline on behalf of the Konus-Wind team, report:
The long GRB 090718B (Fermi/GMM trigger 269633864/09071876;
A.J. van der Horst, GCN 9690)
triggered Konus-RF instrument onboard CORONAS-PHOTON s/c
at T0=65863.878 s UT (18:17:43.878),
and Konus-Wind
at T0=65882.144 s UT (18:18:02.144),
The burst light curve shows a smooth structure
with a duration of ~35 s. The Konus-RF and Konus-Wind
light curves of this GRB are available at
http://www.ioffe.ru/LEA/GRBs/GRB090718_T65882/
As observed by Konus-RF the burst
had a fluence of 2.6(-0.13, +0.13)x10-5 erg/cm2,
and a 64-ms peak flux measured from T0+20.904 s
of 5.0(-0.24, +0.24)x10-6 erg/cm2/s
(both in the 20 keV - 1 MeV energy range).
The time-integrated spectrum of the burst
(from T0-2.0 to T0+34.0 s) is well fit
(in the 20 keV - 1 MeV range) by GRB (Band) model
for which:
the low-energy photon index alpha = -1.3 0.1,
the high energy photon index beta = -4.6( < -2.2),
the peak energy Ep = 250(-50, +35) keV (chi2 = 126/106 dof).
The spectrum of the burst at the maximum count rate
(from T0+20.5 to T0+21.0 s) is well fit
(in the 20 keV - 1 MeV range) by GRB (Band) model
for which:
the low-energy photon index alpha = -0.83 0.13,
the high energy photon index beta = -3.0( < -2.3),
the peak energy Ep = 245(-40, +45) keV (chi2 = 51/60 dof).
Due to uncertainties in the burst incident angle
the quoted values are preliminary.
All the quoted errors are at the 90% confidence level.
--
|