batgrbproduct analysis for trigger=1209398
batgrbproduct Analysis for Trigger=1209398
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time (local time): Thu Jan 18 09:43:29 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1209398/GCN5_download_cron
======================================================================
Trigger: 01209398 Segment: 000
BAT Trigger Time: 727198928 [s; MET]
Trigger Stop: 727199048 [s; MET]
UTC: 2024-01-17T15:41:35.251960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 186.220762248019 Dec: -62.7140619668172 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.89
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.89
Flight Position: [ source = BAT ]
RA: 186.220762248019 Dec: -62.7140619668172 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 186.219977317891 Dec: -62.7126952296152 [deg; J2000]
{ 12h 24m 52.8s , -62d 42' 45.7" }
+/- 2.68661357219662 [arcmin] (estimated 90% radius based on SNR)
+/- 1.52024959687158 [arcmin] (formal 1-sigma fit error)
SNR: 7.41255771775952
Angular difference between Flight and Ground position is 0.084799 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 120 +/-
Measured from: 0
to: 120 [s; relative to TRIGTIME]
T50: 120 +/-
Measured from: 0
to: 120 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 120 second)
Measured from: 0
to: 120 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 120 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.748913 0.393699 0.058826 -0.008365
0.069923 0.068952 0.057666 0.048814 [error]
Peak 0.748913 0.393699 0.058826 -0.008365
0.069923 0.068952 0.057666 0.048814 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 1.92e-07 1.61e-07 9.18e-08 7.77e-08 4.80e-07 5.23e-07 erg/cm2
Error 3.12e-08 3.27e-08 3.71e-08 5.66e-08 9.58e-08 1.26e-07 erg/cm2
Peak flux Power-law 5.32e-02 2.50e-02 7.11e-03 2.54e-03 8.67e-02 8.78e-02 ph/cm2/s
Error 8.78e-03 4.85e-03 2.79e-03 1.74e-03 1.32e-02 1.35e-02 ph/cm2/s
Fluence Cutoff-PL 2.14e-07 1.60e-07 1.68e-09 2.81e-15 3.75e-07 3.75e-07 erg/cm2
Error 3.67e-08 3.57e-08 5.94e-09 3.82e-12 6.02e-08 6.02e-08 erg/cm2
Peak flux Cutoff-PL 5.64e-02 2.72e-02 1.62e-04 1.42e-10 8.38e-02 8.38e-02 ph/cm2/s
Error 1.01e-02 7.18e-03 5.46e-04 1.87e-07 1.23e-02 1.23e-02 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.811 0.350 - - 3.60e-04 1.10e-04 77.870 57
CPL -6.067 -0.946 23.2 2.1 1.64e+03 9.96e+05 59.790 56
The chi2 of BB fit is 63.05 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.811 0.350 - - 3.60e-04 1.10e-04 77.870 57
CPL -6.067 -0.946 23.2 2.1 1.64e+03 8.14e+05 59.790 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 120.000 0.000 120.000
T90 120.000 0.000 120.000
T50 120.000 0.000 120.000
Peak 120.000 0.000 120.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
186.2200 -62.7127 0.0260 4.4 45.7 1.4077 7.4 TRIG_01209398
------------------------------------------
Foreground time interval of the image:
0.000 120.000 (delta_t = 120.000 [sec])
Background time interval of the image:
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 120.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.81129 ( -0.328342 0.371395 )
Norm@50keV : 3.60463E-04 ( -0.000106477 0.000113652 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.87 using 59 PHA bins.
# Reduced chi-squared = 1.366 for 57 degrees of freedom
# Null hypothesis probability = 3.454223e-02
Photon flux (15-150 keV) in 120 sec: 8.67290E-02 ( -0.0131449 0.0131815 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.7951e-07 ( -9.22974e-08 9.9348e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 120.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.06700 ( 4.81771 2.9263 )
Epeak [keV] : 23.1614 ( -2.05919 2.16999 )
Norm@50keV : 1637.10 ( -1760.14 1.98935e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.79 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 56 degrees of freedom
# Null hypothesis probability = 3.398139e-01
Photon flux (15-150 keV) in 120 sec: 8.37733E-02 ( -0.0122576 0.0122973 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.75356e-07 ( -5.8752e-08 6.15936e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 120.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -2.72728 -5 )
beta : -8.07998 ( 8.08293 4.14952 )
Epeak [keV] : 22.9896 ( -1.94851 2.1026 )
Norm@50keV : 254.532 ( -35.3118 245.139 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.96 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 55 degrees of freedom
# Null hypothesis probability = 3.006637e-01
Photon flux (15-150 keV) in 120 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.51286 (-0.635092 0.716098)
R^2/D10^2 : 0.497467 (-0.210545 0.367312)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.05 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 57 degrees of freedom
# Null hypothesis probability = 2.711371e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.112e-07 5.268e-08
25- 50 1.742e-07 4.517e-08
50-150 1.113e-08 7.078e-09
15-150 3.966e-07 9.054e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.5621 (-4.48935 6.60067)
Norm : 1.17045 (-0.35307 0.530115)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.039e-07 3.870e-08
25- 50 1.683e-07 4.513e-08
50-150 4.433e-08 2.831e-08
15-150 4.165e-07 9.426e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 4.49340E-06 (-4.26949e-06 3.88974e-05)
kT2 [keV] : 5.40400 (-0.622557 0.701675)
R2^2/D10^2 : 0.535170 (-0.227107 0.397969)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.109e-07 2.660e+00
25- 50 1.749e-07 2.261e+01
50-150 1.129e-08 6.012e+02
15-150 3.970e-07 6.204e+02
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 120.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.81129 ( -0.328342 0.371395 )
Norm@50keV : 3.60463E-04 ( -0.000106477 0.000113652 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.87 using 59 PHA bins.
# Reduced chi-squared = 1.366 for 57 degrees of freedom
# Null hypothesis probability = 3.454223e-02
Photon flux (15-150 keV) in 120 sec: 8.67290E-02 ( -0.0131449 0.0131815 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.7951e-07 ( -9.22974e-08 9.9348e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 120.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.06700 ( 4.81771 2.9263 )
Epeak [keV] : 23.1614 ( -2.05919 2.16999 )
Norm@50keV : 1637.10 ( -1760.14 1.6261e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.79 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 56 degrees of freedom
# Null hypothesis probability = 3.398139e-01
Photon flux (15-150 keV) in 120 sec: 8.37733E-02 ( -0.0122576 0.0122973 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.75356e-07 ( -5.8752e-08 6.15936e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 120.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -2.72728 -5 )
beta : -8.07998 ( 8.08293 4.14952 )
Epeak [keV] : 22.9896 ( -1.94851 2.1026 )
Norm@50keV : 254.532 ( -35.3118 245.139 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.96 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 55 degrees of freedom
# Null hypothesis probability = 3.006637e-01
Photon flux (15-150 keV) in 120 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.51286 (-0.635092 0.716098)
R^2/D10^2 : 0.497467 (-0.210545 0.367312)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.112e-07 5.322e-08
25- 50 1.742e-07 4.825e-08
50-150 1.113e-08 6.783e-09
15-150 3.966e-07 9.318e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.5621 (-4.48935 6.60067)
Norm : 1.17045 (-0.35307 0.530115)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.039e-07 3.912e-08
25- 50 1.683e-07 4.556e-08
50-150 4.433e-08 2.789e-08
15-150 4.165e-07 9.768e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 4.49340E-06 (-4.26949e-06 3.88974e-05)
kT2 [keV] : 5.40400 (-0.622557 0.701675)
R2^2/D10^2 : 0.535170 (-0.227107 0.397969)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.109e-07 3.100e+00
25- 50 1.749e-07 2.363e+01
50-150 1.129e-08 6.264e+02
15-150 3.970e-07 5.671e+02
Plot creation:
Thu Jan 18 09:45:29 EST 2024