batgrbproduct analysis for trigger=1191994
batgrbproduct Analysis for Trigger=1191994
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): Fri Sep 15 03:50:51 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1191994/GCN5_download_cron
======================================================================
Trigger: 01191994 Segment: 000
BAT Trigger Time: 716371952 [s; MET]
Trigger Stop: 716372760 [s; MET]
UTC: 2023-09-14T08:11:59.993600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 263.418507862967 Dec: -15.6322318104359 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 25.55
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 25.55
Flight Position: [ source = BAT ]
RA: 263.418507862967 Dec: -15.6322318104359 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 263.527925566949 Dec: -15.8203541890197 [deg; J2000]
{ 17h 34m 06.7s , -15d 49' 13.3" }
+/- 15.3919898658443 [arcmin] (estimated 90% radius based on SNR)
+/- 5.44994633265788 [arcmin] (formal 1-sigma fit error)
SNR: 0.612326416820249
Angular difference between Flight and Ground position is 12.935912 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 808 +/-
Measured from: 0
to: 808 [s; relative to TRIGTIME]
T50: 808 +/-
Measured from: 0
to: 808 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 808 second)
Measured from: 0
to: 808 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 808 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.157135 0.041145 0.020882 -0.067700
0.123342 0.104974 0.079370 0.064741 [error]
Peak 0.157135 0.041145 0.020882 -0.067700
0.123342 0.104974 0.079370 0.064741 [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 3.48e-08 3.66e-08 2.72e-08 3.23e-08 1.11e-07 1.23e-07 erg/cm2
Error 4.23e-08 4.11e-08 4.70e-08 6.66e-07 1.37e-07 6.74e-07 erg/cm2
Peak flux Power-law 6.18e-03 3.69e-03 1.39e-03 6.62e-04 1.16e-02 1.18e-02 ph/cm2/s
Error 7.71e-03 4.07e-03 2.27e-03 8.49e-03 1.27e-02 1.31e-02 ph/cm2/s
Fluence Cutoff-PL 5.20e-08 3.95e-08 1.49e-10 5.00e-18 9.17e-08 9.15e-08 erg/cm2
Error 5.38e-08 3.74e-08 1.90e-08 0.00e+00 8.76e-08 8.77e-08 erg/cm2
Peak flux Cutoff-PL 8.93e-03 4.43e-03 8.93e-06 1.38e-13 1.34e-02 1.33e-02 ph/cm2/s
Error 8.91e-03 5.38e-03 1.85e-03 0.00e+00 1.19e-02 1.19e-02 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 8.07e-03 6.26e-03 1.75e-03 -------- 1.61e-02 1.20e-02 ph/cm2/s
Error 1.25e-02 8.55e-03 -------- -------- 1.95e-02 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.478 0.000 - - 6.00e-05 8.15e-05 72.880 57
CPL -9.904 1.039 24.2 18.3 1.55e+05 1.25e+07 71.320 56
The chi2 of BB fit is 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 2.478 0.000 - - 6.00e-05 8.15e-05 72.880 57
CPL -9.904 1.039 24.2 18.3 1.55e+05 1.25e+07 71.320 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 808.000 0.000 808.000
T90 808.000 0.000 808.000
T50 808.000 0.000 808.000
Peak 808.000 0.000 808.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
263.5279 -15.8204 0.3146 13.4 -3.6 0.7799 0.6 TRIG_01191994
------------------------------------------
Foreground time interval of the image:
0.000 183.020 (delta_t = 183.020 [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 183.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.47814 ( -2.44594 -2.44594 )
Norm@50keV : 5.99756E-05 ( -6.01536e-05 0.000102897 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.88 using 59 PHA bins.
# Reduced chi-squared = 1.279 for 57 degrees of freedom
# Null hypothesis probability = 7.652879e-02
Photon flux (15-150 keV) in 183 sec: 1.16378E-02 ( -0.0116241 0.013777 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11233e-07 ( -1.08493e-07 1.66252e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 183.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.90421 ( 9.92102 11.999 )
Epeak [keV] : 24.1994 ( -8.55848 28.0321 )
Norm@50keV : 1.54784E+05 ( -171952 2.48486e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.32 using 59 PHA bins.
# Reduced chi-squared = 1.274 for 56 degrees of freedom
# Null hypothesis probability = 8.144351e-02
Photon flux (15-150 keV) in 183 sec: 1.33748E-02 1.32686E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5274e-19 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 183.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -13.793 -4.95633 )
beta : -9.81647 ( 9.81647 19.8056 )
Epeak [keV] : 23.4394 ( -11.1094 63.2623 )
Norm@50keV : 34.1270 ( -34.1878 2483.42 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.80 using 59 PHA bins.
# Reduced chi-squared = 1.305 for 55 degrees of freedom
# Null hypothesis probability = 6.367917e-02
Photon flux (15-150 keV) in 183 sec: 1.61413E-02 ( 6.98386 -0.0161413 ) 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] : 5.79007 (-5.82372 -5.82372)
R^2/D10^2 : 5.78167E-02 (-0.0572128 -0.0572128)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.25 using 59 PHA bins.
# Reduced chi-squared = 1.268 for 57 degrees of freedom
# Null hypothesis probability = 8.398643e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.470e-08 3.482e-08
25- 50 4.121e-08 3.298e-08
50-150 3.254e-09 5.871e-09
15-150 8.916e-08 6.119e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 27.8784 (-27.8784 -27.8784)
Norm : 0.106212 (-0.106212 -0.106212)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.803e-08 3.015e-08
25- 50 4.167e-08 3.588e-08
50-150 2.068e-08 3.075e-08
15-150 1.004e-07 8.971e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.57247 (-5.56467 -5.56467)
R1^2/D10^2 : 6.35257E-02 (-0.0641363 -0.0641363)
kT2 [keV] : 18.6114 (-18.5557 -18.5557)
R2^2/D10^2 : 1.03188E-04 (-0.000105529 -0.000105529)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.409e-08 3.955e-08
25- 50 4.231e-08 5.459e-08
50-150 1.798e-08 6.548e-09
15-150 1.044e-07 1.251e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 183.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.47814 ( -2.44594 -2.44594 )
Norm@50keV : 5.99756E-05 ( -6.01536e-05 0.000102897 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.88 using 59 PHA bins.
# Reduced chi-squared = 1.279 for 57 degrees of freedom
# Null hypothesis probability = 7.652879e-02
Photon flux (15-150 keV) in 183 sec: 1.16378E-02 ( -0.0116241 0.013777 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11233e-07 ( -1.08493e-07 1.66252e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 183.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.90421 ( 9.92102 11.999 )
Epeak [keV] : 24.1994 ( -8.55848 28.0321 )
Norm@50keV : 1.54784E+05 ( -171952 2.48486e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.32 using 59 PHA bins.
# Reduced chi-squared = 1.274 for 56 degrees of freedom
# Null hypothesis probability = 8.144351e-02
Photon flux (15-150 keV) in 183 sec: 1.33748E-02 1.32686E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5274e-19 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 183.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -14.6479 -4.95633 )
beta : -9.81647 ( 9.81647 19.8056 )
Epeak [keV] : 23.4394 ( -10.9552 61.6539 )
Norm@50keV : 34.1270 ( -34.1878 2483.42 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.80 using 59 PHA bins.
# Reduced chi-squared = 1.305 for 55 degrees of freedom
# Null hypothesis probability = 6.367917e-02
Photon flux (15-150 keV) in 183 sec: 1.61413E-02 ( 6.98386 -0.0161413 ) 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] : 5.79007 (-5.82372 -5.82372)
R^2/D10^2 : 5.78167E-02 (-0.0572128 -0.0572128)
(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 4.470e-08 3.289e-08
25- 50 4.121e-08 2.966e-08
50-150 3.254e-09 4.903e-09
15-150 8.916e-08 6.524e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 27.8784 (-27.8784 -27.8784)
Norm : 0.106212 (-0.106212 -0.106212)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.803e-08 3.072e-08
25- 50 4.167e-08 3.650e-08
50-150 2.068e-08 2.546e-08
15-150 1.004e-07 9.571e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.57247 (-5.56467 -5.56467)
R1^2/D10^2 : 6.35257E-02 (-0.0641363 -0.0641363)
kT2 [keV] : 18.6114 (-18.5557 -18.5557)
R2^2/D10^2 : 1.03188E-04 (-0.000105529 -0.000105529)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.409e-08 3.837e-08
25- 50 4.231e-08 4.458e-08
50-150 1.798e-08 2.081e-08
15-150 1.044e-07 1.310e-07
Plot creation:
Fri Sep 15 03:52:59 EDT 2023