batgrbproduct analysis for trigger=1125354
batgrbproduct Analysis for Trigger=1125354
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 27 14:35:20 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1125354/GCN5_download_cron
======================================================================
Trigger: 01125354 Segment: 000
BAT Trigger Time: 685877000 [s; MET]
Trigger Stop: 685877064 [s; MET]
UTC: 2022-09-26T09:22:50.072660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.011391002499 Dec: -16.0425187265264 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 22.17
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 22.17
Flight Position: [ source = BAT ]
RA: 245.011391002499 Dec: -16.0425187265264 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.006643659963 Dec: -16.043286141507 [deg; J2000]
{ 16h 20m 01.6s , -16d 02' 35.8" }
+/- 0.90813801181378 [arcmin] (estimated 90% radius based on SNR)
+/- 0.268129926863154 [arcmin] (formal 1-sigma fit error)
SNR: 34.9061093871693
Angular difference between Flight and Ground position is 0.277593 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 1029.10399997234 +/- 25.7217503021218
Measured from: -204.923999905586
to: 824.180000066757 [s; relative to TRIGTIME]
T50: 568.327999949455 +/- 288.671237870655
Measured from: 16.5080001354218
to: 584.836000084877 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -200.496000051498
to: -199.496000051498 [s; relative to TRIGTIME]
Total Fluence
Measured from: -223.299999952316
to: 840.416000008583 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 77.080283 5.935864 -0.301958 0.234268
0.306091 0.257679 0.217114 0.196039 [error]
Peak 0.126736 0.021644 0.000724 0.009697
0.012577 0.009927 0.008408 0.007888 [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 2.67e-05 2.53e-06 9.55e-08 3.74e-09 2.93e-05 2.93e-05 erg/cm2
Error 1.87e-06 1.57e-07 1.72e-08 1.18e-09 1.85e-06 1.85e-06 erg/cm2
Peak flux Power-law 1.21e+00 1.81e-01 1.23e-02 8.96e-04 1.41e+00 1.41e+00 ph/cm2/s
Error 2.31e-01 8.94e-02 1.65e-02 2.20e-03 2.78e-01 2.78e-01 ph/cm2/s
Fluence Cutoff-PL 2.40e-05 2.23e-06 4.62e-09 1.88e-14 2.62e-05 2.62e-05 erg/cm2
Error 2.29e-06 1.78e-07 5.93e-09 4.16e-13 2.29e-06 2.29e-06 erg/cm2
Peak flux Cutoff-PL 1.38e+00 4.71e-02 1.05e-07 1.31e-21 1.43e+00 1.43e+00 ph/cm2/s
Error 2.60e-01 9.66e-02 7.67e-03 0.00e+00 2.67e-01 2.68e-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 6.726 0.187 - - 1.10e-04 1.62e-05 100.180 57
CPL 1.000 0.000 50.0 0.0 1.45e-03 0.00e+00 1281.290 56
The chi2 of BB fit is 67.68 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 4.875 0.900 - - 1.03e-03 9.68e-04 67.630 57
CPL 1.000 0.000 50.0 0.0 1.71e-02 0.00e+00 115.120 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 1063.720 -223.300 840.416
T90 1029.100 -204.924 824.180
T50 568.328 16.508 584.836
Peak 1.000 -200.496 -199.496
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.0066 -16.0433 0.0055 17.1 -16.6 8.8102 34.9 TRIG_01125354
------------------------------------------
Foreground time interval of the image:
-16.799 71.301 (delta_t = 88.100 [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
Multiple GTIs in the spectrum
tstart tstop
-223.300000 212.862100
214.000000 248.770000
250.000000 682.930000
684.000000 720.249100
721.000000 840.416000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.72551 ( -0.187932 0.18563 )
Norm@50keV : 1.10447E-04 ( -1.51961e-05 1.71993e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 100.18 using 59 PHA bins.
# Reduced chi-squared = 1.7575 for 57 degrees of freedom
# Null hypothesis probability = 3.608436e-04
Photon flux (15-150 keV) in 1060 sec: 0.950805 ( -0.0643408 0.0654109 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9343e-05 ( -1.83746e-06 1.86485e-06 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-223.300000 212.862100
214.000000 248.770000
250.000000 682.930000
684.000000 720.249100
721.000000 840.416000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.44836E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1281.29 using 59 PHA bins.
# Reduced chi-squared = 22.8802 for 56 degrees of freedom
# Null hypothesis probability = 3.397001e-231
Photon flux (15-150 keV) in 1060 sec: 0.837898 ( -0.081208 0.080222 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62101e-05 ( -2.31059e-06 2.27921e-06 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-223.300000 212.862100
214.000000 248.770000
250.000000 682.930000
684.000000 720.249100
721.000000 840.416000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.75654 ( 4.00328 7.75654 )
beta : -6.71073 ( -0.196095 0.178075 )
Epeak [keV] : 394.540 ( -394.54 -394.54 )
Norm@50keV : 1.51956E-02 ( -0.00215164 0.00225337 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 100.20 using 59 PHA bins.
# Reduced chi-squared = 1.8217 for 55 degrees of freedom
# Null hypothesis probability = 1.897198e-04
Photon flux (15-150 keV) in 1060 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] : 2.67502 (-0.0935345 0.100549)
R^2/D10^2 : 237.726 (-67.214 91.967)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.68 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 57 degrees of freedom
# Null hypothesis probability = 1.572565e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.229e-05 2.221e-06
25- 50 2.137e-06 1.521e-07
50-150 1.281e-09 4.312e-10
15-150 2.442e-05 2.173e-06
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.39577 (-0.208411 0.229314)
Norm : 321.441 (-76.3307 98.4088)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.431e-05 2.178e-06
25- 50 2.261e-06 1.701e-07
50-150 5.868e-09 1.917e-09
15-150 2.657e-05 2.035e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.67971 (-0.0974159 0.0971116)
R1^2/D10^2 : 234.132 (-64.41 93.7612)
kT2 [keV] : 199.363 (-199.363 -199.363)
R2^2/D10^2 : 4.08000E-16 (-1.48596e-17 0.000500611)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.221e-05 1.924e-06
25- 50 2.145e-06 1.627e-07
50-150 1.307e-09 4.571e-10
15-150 2.436e-05 2.215e-06
Peak spectrum fit
Power-law model
Time interval is from -200.496 sec. to -199.496 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.87527 ( -0.827423 0.9718 )
Norm@50keV : 1.02659E-03 ( -0.00066932 0.00126662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.63 using 59 PHA bins.
# Reduced chi-squared = 1.186 for 57 degrees of freedom
# Null hypothesis probability = 1.584009e-01
Photon flux (15-150 keV) in 1 sec: 1.40702 ( -0.277632 0.278062 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.55151e-08 ( -1.02083e-08 1.08742e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -200.496 sec. to -199.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.70746E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 115.12 using 59 PHA bins.
# Reduced chi-squared = 2.0557 for 56 degrees of freedom
# Null hypothesis probability = 5.650281e-06
Photon flux (15-150 keV) in 1 sec: 1.42883 1.43030 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.91073e-15 ( 0 0 ) ergs/cm2
Band function
Time interval is from -200.496 sec. to -199.496 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.93650 ( 2.87468 8.9365 )
beta : -4.87526 ( -0.973007 0.827443 )
Epeak [keV] : 169.587 ( -169.587 -169.587 )
Norm@50keV : 0.139528 ( -0.0909627 0.172151 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.63 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 55 degrees of freedom
# Null hypothesis probability = 1.180075e-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] : 2.71437 (-0.419495 0.50725)
R^2/D10^2 : 390.428 (-390.44 879.892)
(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 3.814e-08 2.131e-08
25- 50 3.866e-09 2.468e-09
50-150 2.646e-12 2.956e-12
15-150 4.201e-08 2.319e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.33694 (-1.30011 2.01334)
Norm : 256.098 (-158.233 451.902)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.691e-08 2.077e-08
25- 50 5.388e-09 3.321e-09
50-150 3.842e-11 4.287e-11
15-150 4.234e-08 2.323e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.53387 (-0.453386 0.511734)
R1^2/D10^2 : 580.256 (-290.627 1790.45)
kT2 [keV] : 11.9581 (-6.39869 184.024)
R2^2/D10^2 : 6.90770E-02 (-0.0674503 1.10087)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.717e-08 2.056e-08
25- 50 9.268e-09 5.365e-09
50-150 5.616e-09 5.695e-09
15-150 5.205e-08 2.812e-08
Plot creation:
Tue Sep 27 14:39:04 EDT 2022