batgrbproduct analysis for trigger=1125106
batgrbproduct Analysis for Trigger=1125106
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): Sat Sep 24 13:37:15 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1125106/GCN5_download_cron
======================================================================
Trigger: 01125106 Segment: 000
BAT Trigger Time: 685624216 [s; MET]
Trigger Stop: 685624280 [s; MET]
UTC: 2022-09-23T11:09:46.089840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 135.720562963867 Dec: -40.7070229025924 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8
Flight Position: [ source = BAT ]
RA: 135.720562963867 Dec: -40.7070229025924 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 135.502012952576 Dec: -40.5332163091497 [deg; J2000]
{ 09h 02m 00.5s , -40d 31' 59.6" }
+/- 15.8606367413703 [arcmin] (estimated 90% radius based on SNR)
+/- 0 [arcmin] (formal 1-sigma fit error)
SNR: 0.586644008140442
Angular difference between Flight and Ground position is 14.415959 arcmin
Partial Coding Fraction: 0.609375 [ including projection effects ]
Duration
T90: 596.87600004673 +/- 298.807148751915
Measured from: 311.328000068665
to: 908.204000115395 [s; relative to TRIGTIME]
T50: 430.611999988556 +/- 504.753977035407
Measured from: 480.040000081062
to: 910.652000069618 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 911.167999982834
to: 912.167999982834 [s; relative to TRIGTIME]
Total Fluence
Measured from: 36.0319999456406
to: 933.355999946594 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.006150 4.690682 0.352406 -0.443963
0.212813 0.214662 0.181984 0.163201 [error]
Peak 0.033030 0.020027 0.006788 0.006770
0.007377 0.007149 0.006289 0.005718 [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 2.81e-06 1.82e-06 7.62e-07 4.35e-07 5.61e-06 5.83e-06 erg/cm2
Error 2.06e-07 1.29e-07 1.18e-07 1.21e-07 3.43e-07 3.81e-07 erg/cm2
Peak flux Power-law 3.36e-01 1.71e-01 5.35e-02 2.14e-02 5.73e-01 5.82e-01 ph/cm2/s
Error 1.22e-01 6.68e-02 4.05e-02 3.27e-02 1.84e-01 1.90e-01 ph/cm2/s
Fluence Cutoff-PL 2.46e-06 2.09e-06 2.45e-07 1.36e-09 4.79e-06 4.79e-06 erg/cm2
Error 2.44e-07 1.65e-07 1.16e-07 3.95e-09 3.38e-07 3.38e-07 erg/cm2
Peak flux Cutoff-PL 3.31e-01 1.97e-01 3.16e-02 9.54e-04 5.61e-01 5.61e-01 ph/cm2/s
Error 1.31e-01 9.26e-02 4.63e-02 2.75e-02 1.80e-01 1.81e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.30e-01 1.97e-01 3.58e-02 -------- 5.63e-01 5.63e-01 ph/cm2/s
Error -------- -------- -------- -------- 1.80e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.255 0.148 - - 4.64e-04 5.34e-05 106.090 57
CPL 1.000 0.000 50.0 0.0 2.10e-03 0.00e+00 374.610 56
The chi2 of BB fit is 66.06 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 2.675 0.750 - - 2.61e-03 1.53e-03 38.750 57
CPL 0.866 0.000 19.3 0.0 4.59e-02 0.00e+00 37.890 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 897.324 36.032 933.356
T90 596.876 311.328 908.204
T50 430.612 480.040 910.652
Peak 1.000 911.168 912.168
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
135.5020 -40.5332 0.0000 36.7 -19.6 0.0639 0.6 TRIG_01125106
------------------------------------------
Foreground time interval of the image:
36.032 72.501 (delta_t = 36.469 [sec])
Background time interval of the image:
-239.000 36.032 (delta_t = 275.032 [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
Multiple GTIs in the spectrum
tstart tstop
36.032000 218.980000
220.000000 323.660000
325.000000 338.070000
340.000000 354.360000
356.000000 356.920000
360.000000 403.970000
405.000000 572.190000
573.000000 719.080000
721.000000 933.356000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.25496 ( -0.144814 0.151091 )
Norm@50keV : 4.64347E-04 ( -5.27714e-05 5.40055e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 106.09 using 59 PHA bins.
# Reduced chi-squared = 1.8612 for 57 degrees of freedom
# Null hypothesis probability = 8.588501e-05
Photon flux (15-150 keV) in 884.6 sec: 0.154644 ( -0.0092565 0.00928155 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.60919e-06 ( -3.41777e-07 3.44238e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
36.032000 218.980000
220.000000 323.660000
325.000000 338.070000
340.000000 354.360000
356.000000 356.920000
360.000000 403.970000
405.000000 572.190000
573.000000 719.080000
721.000000 933.356000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.10272E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 374.61 using 59 PHA bins.
# Reduced chi-squared = 6.6894 for 56 degrees of freedom
# Null hypothesis probability = 1.105893e-48
Photon flux (15-150 keV) in 884.6 sec: 0.138792 ( -0.01019 0.010212 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.79307e-06 ( -3.33574e-07 3.42048e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
36.032000 218.980000
220.000000 323.660000
325.000000 338.070000
340.000000 354.360000
356.000000 356.920000
360.000000 403.970000
405.000000 572.190000
573.000000 719.080000
721.000000 933.356000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.366002 ( -1.08619 1.57406 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 19.8276 ( -2.43751 3.10347 )
Norm@50keV : 0.132911 ( -0.132908 1.26976 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.76 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 55 degrees of freedom
# Null hypothesis probability = 1.955565e-01
Photon flux (15-150 keV) in 884.6 sec: 0.139189 ( 6.86081 -0.010612 ) 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] : 5.74840 (-0.311182 0.3265)
R^2/D10^2 : 0.638128 (-0.150177 0.200318)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.06 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 57 degrees of freedom
# Null hypothesis probability = 1.924535e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.324e-06 2.136e-07
25- 50 2.109e-06 1.871e-07
50-150 1.615e-07 4.604e-08
15-150 4.594e-06 2.840e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.7009 (-1.66843 1.90546)
Norm : 2.29550 (-0.356318 0.433777)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.657e-06 2.154e-07
25- 50 2.003e-06 1.592e-07
50-150 4.352e-07 1.171e-07
15-150 5.095e-06 3.384e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.11015 (-1.83982 4.60687)
R1^2/D10^2 : 32.7897 (-36.3981 -36.9677)
kT2 [keV] : 6.07906 (-0.443504 1.29609)
R2^2/D10^2 : 0.462948 (-0.235086 0.200581)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.471e-06 6.847e-07
25- 50 2.116e-06 4.755e-07
50-150 2.030e-07 6.900e-08
15-150 4.791e-06 8.855e-07
Peak spectrum fit
Power-law model
Time interval is from 911.168 sec. to 912.168 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.67517 ( -0.636985 0.863271 )
Norm@50keV : 2.60883E-03 ( -0.00147879 0.00158809 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.75 using 59 PHA bins.
# Reduced chi-squared = 0.6797 for 57 degrees of freedom
# Null hypothesis probability = 9.694037e-01
Photon flux (15-150 keV) in 1 sec: 0.572787 ( -0.183546 0.184194 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.75166e-08 ( -1.07776e-08 1.22053e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 911.168 sec. to 912.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.865746 ( )
Epeak [keV] : 19.3008 ( )
Norm@50keV : 4.59417E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.89 using 59 PHA bins.
# Reduced chi-squared = 0.6766 for 56 degrees of freedom
# Null hypothesis probability = 9.696909e-01
Photon flux (15-150 keV) in 1 sec: 0.561308 ( -0.178553 0.181952 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.40796e-08 ( -9.3e-09 1.34116e-08 ) ergs/cm2
Band function
Time interval is from 911.168 sec. to 912.168 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.80118 ( -0.977244 4.3998 )
beta : -3.29939 ( 9.37167 19.3716 )
Epeak [keV] : 21.2814 ( -9.63705 17.3339 )
Norm@50keV : 268.042 ( -268.372 753.281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.50 using 59 PHA bins.
# Reduced chi-squared = 0.6819 for 55 degrees of freedom
# Null hypothesis probability = 9.657937e-01
Photon flux (15-150 keV) in 1 sec: 0.563301 ( 6.4367 -0.180843 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41884e-08 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.03754 (-1.80632 2.66262)
R^2/D10^2 : 2.08686 (-2.08412 8.12527)
(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 1.020e-08 6.195e-09
25- 50 1.031e-08 6.730e-09
50-150 9.684e-10 9.095e-10
15-150 2.147e-08 1.374e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.3921 (-12.4137 31.0991)
Norm : 5.67544 (-2.91947 7.54784)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.023e-08 6.319e-09
25- 50 1.032e-08 6.206e-09
50-150 4.230e-09 3.965e-09
15-150 2.477e-08 1.507e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.64350 (-4.66194 3.53296)
R1^2/D10^2 : 4.89506 (-4.87836 -4.87836)
kT2 [keV] : 11.6304 (-11.7142 -11.7142)
R2^2/D10^2 : 6.10342E-02 (-0.0598768 7.76905)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.051e-08 6.435e-09
25- 50 1.003e-08 6.535e-09
50-150 4.334e-09 4.044e-09
15-150 2.487e-08 1.609e-08
Plot creation:
Sat Sep 24 13:40:37 EDT 2022