batgrbproduct analysis for trigger=1192480
batgrbproduct Analysis for Trigger=1192480
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): Tue Sep 19 01:33:11 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1192480/GCN5_download_cron
======================================================================
Trigger: 01192480 Segment: 000
BAT Trigger Time: 716696184 [s; MET]
Trigger Stop: 716696248 [s; MET]
UTC: 2023-09-18T02:15:51.971460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.766429685532 Dec: -15.6106560556307 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.38
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.38
Flight Position: [ source = BAT ]
RA: 244.766429685532 Dec: -15.6106560556307 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.810247734987 Dec: -15.6466314440022 [deg; J2000]
{ 16h 19m 14.5s , -15d 38' 47.9" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 67.7733731600543 [arcmin] (formal 1-sigma fit error)
SNR: -0.194297323090118
Angular difference between Flight and Ground position is 3.327107 arcmin
Partial Coding Fraction: 0.359375 [ including projection effects ]
Duration
T90: 31.5519999265671 +/- 11.5336011926379
Measured from: 61.8040001392365
to: 93.3560000658035 [s; relative to TRIGTIME]
T50: 24.4800000190735 +/- 19.1344190945877
Measured from: 61.1680001020432
to: 85.6480001211166 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 65.4119999408722
to: 66.4119999408722 [s; relative to TRIGTIME]
Total Fluence
Measured from: 48.2120000123978
to: 94.067999958992 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.571325 0.076784 -0.013284 0.016123
0.098617 0.086778 0.069379 0.059402 [error]
Peak 0.069944 0.011714 0.015018 0.011470
0.015175 0.013191 0.010564 0.008896 [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 5.58e-07 8.95e-08 6.69e-09 5.35e-10 6.54e-07 6.54e-07 erg/cm2
Error 7.82e-08 3.41e-08 5.84e-09 9.20e-10 9.81e-08 9.82e-08 erg/cm2
Peak flux Power-law 8.13e-01 1.62e-01 1.59e-02 1.71e-03 9.92e-01 9.92e-01 ph/cm2/s
Error 2.75e-01 1.37e-01 3.83e-02 1.19e-02 3.64e-01 3.65e-01 ph/cm2/s
Fluence Cutoff-PL 6.07e-07 3.88e-08 1.50e-12 3.06e-23 6.46e-07 6.46e-07 erg/cm2
Error 8.52e-08 2.94e-08 2.08e-10 0.00e+00 8.87e-08 8.89e-08 erg/cm2
Peak flux Cutoff-PL 8.12e-01 1.53e-01 1.38e-02 1.38e-03 9.81e-01 9.85e-01 ph/cm2/s
Error 2.74e-01 -------- 3.83e-02 1.19e-02 3.63e-01 3.65e-01 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 5.743 0.666 - - 1.47e-04 1.04e-04 51.990 57
CPL 1.000 0.000 50.0 0.0 3.20e-03 0.00e+00 166.800 56
The chi2 of BB fit is 45.44 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 4.345 1.665 - - 1.18e-03 2.05e-03 49.010 57
CPL 1.000 0.000 50.0 0.0 1.53e-02 0.00e+00 60.950 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 45.856 48.212 94.068
T90 31.552 61.804 93.356
T50 24.480 61.168 85.648
Peak 1.000 65.412 66.412
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.8102 -15.6466 0.9922 36.2 -122.8 -0.0256 -0.2 TRIG_01192480
------------------------------------------
Foreground time interval of the image:
48.212 71.301 (delta_t = 23.089 [sec])
Background time interval of the image:
-17.799 48.212 (delta_t = 66.011 [sec])
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 48.212 sec. to 94.068 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.74281 ( -0.631139 0.701387 )
Norm@50keV : 1.47175E-04 ( -7.79502e-05 0.000130145 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.99 using 59 PHA bins.
# Reduced chi-squared = 0.9122 for 57 degrees of freedom
# Null hypothesis probability = 6.628762e-01
Photon flux (15-150 keV) in 45.86 sec: 0.468460 ( -0.06611 0.0661441 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.54064e-07 ( -9.75043e-08 9.87737e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 48.212 sec. to 94.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.19724E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 166.80 using 59 PHA bins.
# Reduced chi-squared = 2.9785 for 56 degrees of freedom
# Null hypothesis probability = 6.041159e-13
Photon flux (15-150 keV) in 45.86 sec: 0.479035 ( -0.066339 0.066233 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.46126e-07 ( -8.8973e-08 8.84273e-08 ) ergs/cm2
Band function
Time interval is from 48.212 sec. to 94.068 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.29138 ( 8.29138 8.29138 )
beta : -5.75990 ( -0.687773 0.644725 )
Epeak [keV] : 4.41363 ( -4.41363 -4.41363 )
Norm@50keV : 1.96416E-02 ( -0.0103506 0.0179333 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.00 using 59 PHA bins.
# Reduced chi-squared = 0.9454 for 55 degrees of freedom
# Null hypothesis probability = 5.901244e-01
Photon flux (15-150 keV) in 45.86 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] : 2.58007 (-0.290606 0.328172)
R^2/D10^2 : 190.221 (-109.324 276.582)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.44 using 59 PHA bins.
# Reduced chi-squared = 0.7971 for 57 degrees of freedom
# Null hypothesis probability = 8.649290e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.998e-07 2.597e-07
25- 50 5.001e-08 2.441e-08
50-150 2.141e-11 2.133e-11
15-150 6.499e-07 2.875e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.63615 (-0.774254 0.9727)
Norm : 146.179 (-73.8737 166.273)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.878e-07 2.058e-07
25- 50 6.230e-08 2.996e-08
50-150 2.175e-10 2.289e-10
15-150 6.504e-07 2.105e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.57021 (-0.318288 0.349528)
R1^2/D10^2 : 195.310 (-113.444 278.83)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 5.83470E-06 (-5.98872e-06 -5.98872e-06)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.989e-07 2.952e-07
25- 50 5.067e-08 2.838e-08
50-150 1.431e-08 2.246e-11
15-150 6.639e-07 3.003e-07
Peak spectrum fit
Power-law model
Time interval is from 65.412 sec. to 66.412 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.34549 ( -1.39272 1.93754 )
Norm@50keV : 1.18271E-03 ( -0.00118258 0.00291638 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.01 using 59 PHA bins.
# Reduced chi-squared = 0.8598 for 57 degrees of freedom
# Null hypothesis probability = 7.652488e-01
Photon flux (15-150 keV) in 1 sec: 0.991922 ( -0.362796 0.365995 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.38611e-08 ( -1.44379e-08 1.8361e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 65.412 sec. to 66.412 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.52549E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.95 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 56 degrees of freedom
# Null hypothesis probability = 3.026533e-01
Photon flux (15-150 keV) in 1 sec: 0.981126 ( -0.353029 0.372944 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.39199e-08 ( -1.67571e-08 1.82744e-08 ) ergs/cm2
Band function
Time interval is from 65.412 sec. to 66.412 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.48134 ( 1.67771 1.67771 )
beta : -6.78328 ( 4.85312 1.83763 )
Epeak [keV] : 13.3640 ( -6.01147 10.6179 )
Norm@50keV : 6687.32 ( -6687.25 198322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.28 using 59 PHA bins.
# Reduced chi-squared = 0.8779 for 55 degrees of freedom
# Null hypothesis probability = 7.271820e-01
Photon flux (15-150 keV) in 1 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] : 2.86120 (-0.76793 1.062)
R^2/D10^2 : 185.999 (-186.012 1393.09)
(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 2.575e-08 1.498e-08
25- 50 3.172e-09 2.076e-09
50-150 3.445e-12 4.445e-12
15-150 2.893e-08 1.705e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.92201 (-2.44812 6.58368)
Norm : 124.180 (-124.18 702.04)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.478e-08 1.489e-08
25- 50 4.491e-09 3.273e-09
50-150 5.119e-11 6.475e-11
15-150 2.933e-08 1.744e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.84103 (-0.760812 0.972321)
R1^2/D10^2 : 193.025 (-163.396 1449.13)
kT2 [keV] : 199.135 (-199.259 -199.259)
R2^2/D10^2 : 8.85212E-05 (-8.05818e-05 0.0249384)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.564e-08 1.479e-08
25- 50 4.025e-09 2.076e-09
50-150 2.341e-08 6.145e-09
15-150 5.307e-08 1.841e-08
Plot creation:
Tue Sep 19 01:35:41 EDT 2023