| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB090112332 |
|
| T0 |
7:57:08.007 UTC |
Fermi_GBM |
| ra |
110.9000° |
Fermi_GBM |
| decl |
-30.4000° |
Fermi_GBM |
| pos_error |
3.22e+00° |
Fermi_GBM |
| T90 |
58.369 s |
Fermi_GBM |
| T90_error |
4.783 s |
Fermi_GBM |
| T90_start |
7:57:08.007 UTC |
Fermi_GBM |
| fluence |
3.92e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
6.84e-08 erg/cm² |
Fermi_GBM |
| T100 |
58.369 s |
|
| GBM_located |
True |
|
| mjd |
54843.33134267361 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB090112332 |
| trigger_name |
bn090112332 |
| ra |
110.9000° |
| decl |
-30.4000° |
| pos_error |
3.22e+00° |
| datum |
2009-01-12 |
| t_trigger |
7:57:23.111 UTC |
| T90 |
58.369 s |
| T90_error |
4.783 s |
| T90_start |
7:57:08.007 UTC |
| fluence |
3.92e-06 erg/cm² |
| fluence_error |
6.84e-08 erg/cm² |
| flux_1024 |
6.03e+00 erg/cm²/s |
| flux_1024_error |
3.01e-01 erg/cm²/s |
| flux_1024_time |
3.90e+00 erg/cm²/s |
| flux_64 |
7.50e+00 erg/cm²/s |
| flux_64_error |
1.52e+00 erg/cm²/s |
| GCN 8803 table |
|---|
| GRB_name |
GRB090112A |
| GCN_number |
8803 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
7:57:23.110 UTC |
| ra |
111.8000° |
| decl |
-30.3000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 8803
SUBJECT: GRB 090112: Fermi GBM detection
DATE: 09/01/13 16:44:12 GMT
FROM: Elisabetta Bissaldi at MPE
E. Bissaldi (MPE) and A. von Kienlin (MPE)
report on behalf of the Fermi GBM Team:
"At 07:57:23.11 UT on 12 January 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090112 (trigger 253439845 / 090112332).
The on-ground calculated location, using the GBM trigger
data, is RA = 111.8, DEC = -30.3 (J2000 degrees,
equivalent to 07h 27m, -30d 17'), with an uncertainty
of 1.7 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 4 degrees.
This burst was also independently detected by INTEGRAL SPI-ACS.
The GRB lightcurve consists of two peaks with some substructure
appearing at T0 and T0+4 s, respectively. A possible precursor
is present around T0-20 s and additional weak emission is visible
up to T0+50s. The event duration (T90) is about 65 s (8-1000 keV)
and T50 is about 27 s (8-1000 keV).
The time-averaged spectrum from T0-6 s to T0+18 s is
best fit by a Band function with Epeak = 150 +/- 40 keV,
alpha = -0.94 +/- 0.20 and beta = -2.01 +/- 0.19
(chi squared 464 for 456 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(5.2 +/- 1.0)E-06 erg/cm^2. The 1-sec peak photon flux
measured starting from T0+4 s in the 8-1000 keV band
is 7 +/- 2 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|