batgrbproduct analysis for trigger=922107
batgrbproduct Analysis for Trigger=922107
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 v2.46
Process Start Time (local time): Mon Aug 26 10:10:42 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger922107/batgroup_hand_proc
======================================================================
Trigger: 00922107 Segment: 000
BAT Trigger Time: 588350823.04 [s; MET]
Trigger Stop: 588350824.064 [s; MET]
UTC: 2019-08-24T14:46:39.574480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 215.328919318933 Dec: -41.9023481012554 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.41
Image Trigger?: NO
Rate S/N Ratio: 28.2488937836511 [ if not an image trigger ]
Image S/N Ratio: 11.41
Flight Position: [ source = BAT ]
RA: 215.328919318933 Dec: -41.9023481012554 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 215.323433768268 Dec: -41.8998543004962 [deg; J2000]
{ 14h 21m 17.6s , -41d 53' 59.5" }
+/- 1.70967885807324 [arcmin] (estimated 90% radius based on SNR)
+/- 0.445569337575467 [arcmin] (formal 1-sigma fit error)
SNR: 14.1378484217935
Angular difference between Flight and Ground position is 0.287055 arcmin
Partial Coding Fraction: 0.2851562 [ including projection effects ]
Duration
T90: 169.360000014305 +/- 5.85471026588723
Measured from: -62.9759999513626
to: 106.384000062943 [s; relative to TRIGTIME]
T50: 51.824000120163 +/- 9.75651090526973
Measured from: -1.75999999046326
to: 50.0640001296997 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.116000056266785
to: 1.11600005626678 [s; relative to TRIGTIME]
Total Fluence
Measured from: -71.8880000114441
to: 114.639999985695 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.830672 5.235392 3.674326 0.678148
0.172943 0.181769 0.164202 0.150069 [error]
Peak 0.117337 0.225224 0.232519 0.076721
0.018196 0.022222 0.021387 0.017627 [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 1.31e-06 2.24e-06 2.90e-06 7.62e-06 8.54e-06 1.41e-05 erg/cm2
Error 9.80e-08 9.89e-08 1.69e-07 9.64e-07 3.99e-07 1.09e-06 erg/cm2
Peak flux Power-law 1.18e+00 1.54e+00 1.48e+00 2.53e+00 5.04e+00 6.73e+00 ph/cm2/s
Error 2.35e-01 1.90e-01 1.68e-01 6.06e-01 5.25e-01 7.51e-01 ph/cm2/s
Fluence Cutoff-PL 1.23e-06 2.31e-06 2.96e-06 4.46e-06 8.28e-06 1.10e-05 erg/cm2
Error 1.20e-07 1.17e-07 1.81e-07 2.03e-06 4.56e-07 2.07e-06 erg/cm2
Peak flux Cutoff-PL 1.06e+00 1.59e+00 1.57e+00 1.61e+00 4.97e+00 5.83e+00 ph/cm2/s
Error 3.64e-01 2.14e-01 2.15e-01 1.05e+00 5.39e-01 1.22e+00 ph/cm2/s
Fluence Band 1.22e-06 2.30e-06 -------- 4.73e-06 8.28e-06 1.12e-05 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 1.624 0.078 - - 4.91e-03 2.14e-04 34.790 57
CPL 1.258 0.322 101.3 132.9 7.48e-03 2.81e-03 30.710 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 1.058 0.173 - - 4.36e-02 4.45e-03 61.080 57
CPL 0.601 0.737 171.7 -44.8 7.08e-02 6.50e-02 59.960 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: 167.680000 sec.
T50 in the 50-300 keV band: 43.136000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 186.528 -71.888 114.640
T90 169.360 -62.976 106.384
T50 51.824 -1.760 50.064
Peak 1.000 0.116 1.116
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
215.3234 -41.8999 0.0136 30.5032 55.1510 9.1321707 14.138 TRIG_00922107
Foreground time interval of the image:
-71.888 15.261 (delta_t = 87.149 [sec])
Background time interval of the image:
-239.040 -71.888 (delta_t = 167.152 [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 -71.888 sec. to 114.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62376 ( -0.0781699 0.0787566 )
Norm@50keV : 4.91032E-03 ( -0.000214197 0.000213556 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.79 using 59 PHA bins.
# Reduced chi-squared = 0.6104 for 57 degrees of freedom
# Null hypothesis probability = 9.911146e-01
Photon flux (15-150 keV) in 186.5 sec: 0.635730 ( -0.0278727 0.0279263 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.54075e-06 ( -3.97961e-07 3.99834e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -71.888 sec. to 114.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25838 ( -0.333842 0.310389 )
Epeak [keV] : 101.318 ( -26.7811 239.055 )
Norm@50keV : 7.47826E-03 ( -0.00220104 0.00341406 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 30.71 using 59 PHA bins.
# Reduced chi-squared = 0.5484 for 56 degrees of freedom
# Null hypothesis probability = 9.976324e-01
Photon flux (15-150 keV) in 186.5 sec: 0.621294 ( -0.030251 0.030286 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.28252e-06 ( -4.56291e-07 4.55918e-07 ) ergs/cm2
Band function
Time interval is from -71.888 sec. to 114.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.26478 ( -0.302683 0.228393 )
beta : -9.26841 ( 9.3686 19.3686 )
Epeak [keV] : 102.887 ( -20.5293 40.4418 )
Norm@50keV : 7.40611E-03 ( -0.00212707 0.00182941 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 30.71 using 59 PHA bins.
# Reduced chi-squared = 0.5584 for 55 degrees of freedom
# Null hypothesis probability = 9.967281e-01
Photon flux (15-150 keV) in 186.5 sec: 0.621537 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.27629e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.2152 ( )
R^2/D10^2 : 8.27456E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 140.20 using 59 PHA bins.
# Reduced chi-squared = 2.4596 for 57 degrees of freedom
# Null hypothesis probability = 5.826024e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.577e-07 5.147e-08
25- 50 2.483e-06 1.296e-07
50-150 3.330e-06 3.012e-07
15-150 6.471e-06 3.450e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 165.759 (-32.7607 -165.81)
Norm : 2.58771 (-0.125101 0.135934)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 30.71 using 59 PHA bins.
# Reduced chi-squared = 0.5388 for 57 degrees of freedom
# Null hypothesis probability = 9.982969e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.228e-06 7.964e-08
25- 50 2.308e-06 2.210e-07
50-150 4.741e-06 1.580e-06
15-150 8.277e-06 1.651e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.59048 (-0.993269 1.10855)
R1^2/D10^2 : 0.804882 (-0.326958 0.646209)
kT2 [keV] : 23.3014 (-2.91427 4.24842)
R2^2/D10^2 : 1.11750E-02 (-0.00523703 0.0075888)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.74 using 59 PHA bins.
# Reduced chi-squared = 0.5770 for 55 degrees of freedom
# Null hypothesis probability = 9.949970e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.183e-06 1.954e-07
25- 50 2.304e-06 2.790e-07
50-150 4.672e-06 8.309e-07
15-150 8.159e-06 9.484e-07
Peak spectrum fit
Power-law model
Time interval is from 0.116 sec. to 1.116 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05770 ( -0.174206 0.170926 )
Norm@50keV : 4.36262E-02 ( -0.00445449 0.00444642 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.08 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 57 degrees of freedom
# Null hypothesis probability = 3.315314e-01
Photon flux (15-150 keV) in 1 sec: 5.04171 ( -0.524109 0.524933 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.62516e-07 ( -5.18356e-08 5.20095e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.116 sec. to 1.116 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.601475 ( -0.860028 0.613631 )
Epeak [keV] : 171.722 ( -82.0783 -171.71 )
Norm@50keV : 7.07878E-02 ( -0.030321 0.0995995 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.96 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 56 degrees of freedom
# Null hypothesis probability = 3.340220e-01
Photon flux (15-150 keV) in 1 sec: 4.96943 ( -0.53994 0.53821 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.53229e-07 ( -5.5531e-08 5.4779e-08 ) ergs/cm2
Band function
Time interval is from 0.116 sec. to 1.116 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.454987 ( 0.844785 0.844785 )
beta : -1.42572 ( 1.41319 0.476029 )
Epeak [keV] : 135.947 ( -134.999 217.359 )
Norm@50keV : 8.44179E-02 ( -0.0474096 1.71985e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.69 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 55 degrees of freedom
# Null hypothesis probability = 3.090092e-01
Photon flux (15-150 keV) in 1 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] : 20.2793 (-2.43802 2.96453)
R^2/D10^2 : 0.235498 (-0.0840272 0.121639)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.24 using 59 PHA bins.
# Reduced chi-squared = 1.250 for 57 degrees of freedom
# Null hypothesis probability = 9.724515e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.857e-08 4.130e-09
25- 50 9.333e-08 1.484e-08
50-150 2.850e-07 4.910e-08
15-150 3.969e-07 5.260e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-21.7459 -200)
Norm : 20.3848 (-2.15895 2.15895)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.24 using 59 PHA bins.
# Reduced chi-squared = 1.443 for 57 degrees of freedom
# Null hypothesis probability = 1.597693e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.075e-08 2.782e-08
25- 50 9.762e-08 5.345e-08
50-150 2.141e-07 1.172e-07
15-150 3.625e-07 1.988e-07
Double BB
R1^2/D10^2 : 0.581976 (-0.282155 1833.71)
kT2 [keV] : 79.2683 (-73.4948 -73.4949)
R2^2/D10^2 : 3.21962E-03 (-0.00362256 0.222555)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.36 using 59 PHA bins.
#Fit statistic : Chi-Squared = 61.29 using 59 PHA bins.
#Fit statistic : Chi-Squared = 61.22 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 55 degrees of freedom
# Reduced chi-squared = 1.114 for 55 degrees of freedom
# Reduced chi-squared = 1.113 for 55 degrees of freedom
# Null hypothesis probability = 2.310378e-01
# Null hypothesis probability = 2.607886e-01
# Null hypothesis probability = 2.626739e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.498e-08 1.469e-08
25- 50 8.346e-08 1.849e-08
50-150 3.087e-07 6.935e-08
15-150 4.272e-07 8.195e-08
Plot creation:
Mon Aug 26 10:17:49 EDT 2019