batgrbproduct Analysis for Trigger=731535
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): Wed Jan 11 06:21:37 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger731535/GCN5_download_cron
======================================================================
Trigger: 00731535 Segment: 000
BAT Trigger Time: 505728152 [s; MET]
Trigger Stop: 505728216 [s; MET]
UTC: 2017-01-10T08:02:13.561480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 259.888854995834 Dec: -25.0149956632395 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 11.95
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.95
Flight Position: [ source = BAT ]
RA: 259.888854995834 Dec: -25.0149956632395 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 259.886711656993 Dec: -25.0173150995354 [deg; J2000]
{ 17h 19m 32.8s , -25d 01' 02.3" }
+/- 1.05740419406263 [arcmin] (estimated 90% radius based on SNR)
+/- 0.497044775921286 [arcmin] (formal 1-sigma fit error)
SNR: 28.0858996026255
Angular difference between Flight and Ground position is 0.181516 arcmin
Partial Coding Fraction: 0.7734375 [ including projection effects ]
Duration
T90: 569.335999965668 +/- 26.3903285291889
Measured from: -27.41999989748
to: 541.916000068188 [s; relative to TRIGTIME]
T50: 302.171999931335 +/- 22.5188629132412
Measured from: 114.64400011301
to: 416.816000044346 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 303.096000015736
to: 304.096000015736 [s; relative to TRIGTIME]
Total Fluence
Measured from: -54.255999982357
to: 580.167999982834 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.213786 6.465245 3.929254 0.459295
0.195247 0.177650 0.145608 0.119589 [error]
Peak 0.017294 0.022183 0.011986 0.020188
0.007798 0.006993 0.005874 0.004699 [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 1.70e-06 2.62e-06 3.03e-06 6.74e-06 9.34e-06 1.41e-05 erg/cm2
Error 1.07e-07 9.69e-08 1.48e-07 7.16e-07 3.49e-07 8.22e-07 erg/cm2
Peak flux Power-law 1.74e-01 1.54e-01 9.39e-02 8.64e-02 4.59e-01 5.09e-01 ph/cm2/s
Error 1.04e-01 5.76e-02 4.87e-02 1.11e-01 1.69e-01 1.85e-01 ph/cm2/s
Fluence Cutoff-PL 1.57e-06 2.72e-06 3.08e-06 3.53e-06 8.98e-06 1.09e-05 erg/cm2
Error 1.31e-07 1.14e-07 1.58e-07 1.30e-06 4.07e-07 1.36e-06 erg/cm2
Peak flux Cutoff-PL 1.79e-01 1.55e-01 9.17e-02 8.13e-02 4.61e-01 5.09e-01 ph/cm2/s
Error 1.04e-01 6.73e-02 7.14e-02 1.09e-01 1.69e-01 1.83e-01 ph/cm2/s
Fluence Band 1.50e-06 2.77e-06 2.97e-06 5.64e-06 9.04e-06 1.29e-05 erg/cm2
Error 1.52e-07 -------- 1.57e-07 -------- 3.89e-07 -------- 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 1.790 0.067 - - 1.61e-03 5.87e-05 53.100 57
CPL 1.334 0.278 71.7 22.6 2.73e-03 8.85e-04 44.410 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.717 0.737 - - 3.44e-03 1.38e-03 72.350 57
CPL 1.738 2.045 9999.4 -0.0 3.40e-03 0.00e+00 72.350 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 634.424 -54.256 580.168
T90 569.336 -27.420 541.916
T50 302.172 114.644 416.816
Peak 1.000 303.096 304.096
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
259.8867 -25.0173 0.0068 18.9 -91.8 14.1266 28.1 TRIG_00731535
------------------------------------------
Foreground time interval of the image:
-18.499 -16.220 (delta_t = 2.279 [sec])
-15.000 508.701 (delta_t = 523.701 [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
-54.256000 -22.680000
-20.000000 -16.220000
-15.000000 580.168000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78956 ( -0.0664299 0.0668293 )
Norm@50keV : 1.60934E-03 ( -5.87939e-05 5.86378e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.10 using 59 PHA bins.
# Reduced chi-squared = 0.9316 for 57 degrees of freedom
# Null hypothesis probability = 6.219940e-01
Photon flux (15-150 keV) in 630.5 sec: 0.220873 ( -0.00838893 0.00841665 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.34496e-06 ( -3.4837e-07 3.49364e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-54.256000 -22.680000
-20.000000 -16.220000
-15.000000 580.168000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33439 ( -0.287252 0.269275 )
Epeak [keV] : 71.6646 ( -11.5159 33.6508 )
Norm@50keV : 2.72848E-03 ( -0.000715806 0.00105333 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.41 using 59 PHA bins.
# Reduced chi-squared = 0.7930 for 56 degrees of freedom
# Null hypothesis probability = 8.681336e-01
Photon flux (15-150 keV) in 630.5 sec: 0.213800 ( -0.009253 0.009282 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.98053e-06 ( -4.07114e-07 4.0724e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-54.256000 -22.680000
-20.000000 -16.220000
-15.000000 580.168000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.659573 ( -0.9156 4.40123 )
beta : -1.95461 ( 1.95375 0.13198 )
Epeak [keV] : 43.8624 ( -17.48 49.3789 )
Norm@50keV : 7.56806E-03 ( -0.00798535 19.7496 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.68 using 59 PHA bins.
# Reduced chi-squared = 0.7942 for 55 degrees of freedom
# Null hypothesis probability = 8.640985e-01
Photon flux (15-150 keV) in 630.5 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.04377e-06 ( -9.03935e-06 -3.88514e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.1083 ( )
R^2/D10^2 : 3.65119E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 198.35 using 59 PHA bins.
# Reduced chi-squared = 3.4799 for 57 degrees of freedom
# Null hypothesis probability = 1.620450e-17
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.388e-07 5.769e-08
25- 50 2.915e-06 1.387e-07
50-150 3.182e-06 2.409e-07
15-150 6.935e-06 2.869e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 113.488 (-16.8214 17.5201)
Norm : 0.929156 (-0.0453202 0.057718)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.48 using 59 PHA bins.
# Reduced chi-squared = 0.7803 for 57 degrees of freedom
# Null hypothesis probability = 8.864624e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.529e-06 1.122e-07
25- 50 2.708e-06 1.277e-07
50-150 4.699e-06 1.152e-06
15-150 8.936e-06 1.220e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.84688 (-0.789425 0.839179)
R1^2/D10^2 : 0.269804 (-0.0879722 0.147792)
kT2 [keV] : 22.9745 (-2.64772 3.63699)
R2^2/D10^2 : 3.42610E-03 (-0.00148972 0.00217997)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.20 using 59 PHA bins.
# Reduced chi-squared = 0.7854 for 55 degrees of freedom
# Null hypothesis probability = 8.755142e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.458e-06 1.888e-07
25- 50 2.762e-06 2.541e-07
50-150 4.671e-06 6.831e-07
15-150 8.891e-06 8.764e-07
Peak spectrum fit
Power-law model
Time interval is from 303.096 sec. to 304.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71679 ( -0.724605 0.749667 )
Norm@50keV : 3.43624E-03 ( -0.00143273 0.00133727 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.35 using 59 PHA bins.
# Reduced chi-squared = 1.269 for 57 degrees of freedom
# Null hypothesis probability = 8.271173e-02
Photon flux (15-150 keV) in 1 sec: 0.459078 ( -0.168186 0.168949 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.17753e-08 ( -1.2903e-08 1.36326e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 303.096 sec. to 304.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73847 ( -2.30926 1.78145 )
Epeak [keV] : 9999.35 ( -9999.35 -9999.36 )
Norm@50keV : 3.39621E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.35 using 59 PHA bins.
# Reduced chi-squared = 1.292 for 56 degrees of freedom
# Null hypothesis probability = 6.971910e-02
Photon flux (15-150 keV) in 1 sec: 0.460572 ( -0.169989 0.167296 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.18121e-08 ( -1.44944e-08 1.33014e-08 ) ergs/cm2
Band function
Time interval is from 303.096 sec. to 304.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96329 ( -4.96329 -4.96329 )
beta : -1.81425 ( -1.46606 0.783391 )
Epeak [keV] : 22.5942 ( -22.5942 63.0815 )
Norm@50keV : 795.114 ( -284.475 5.97049e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.14 using 59 PHA bins.
# Reduced chi-squared = 1.312 for 55 degrees of freedom
# Null hypothesis probability = 6.032473e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24141e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.7858 (-3.79219 6.65545)
R^2/D10^2 : 0.161190 (-0.161073 0.675923)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.24 using 59 PHA bins.
# Reduced chi-squared = 1.303 for 57 degrees of freedom
# Null hypothesis probability = 6.214104e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.902e-09 2.579e-09
25- 50 1.075e-08 6.890e-09
50-150 6.959e-09 5.320e-09
15-150 2.161e-08 1.440e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 105.586 (-108.698 -108.698)
Norm : 2.01195 (-0.81641 1.69348)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.68 using 59 PHA bins.
# Reduced chi-squared = 1.275 for 57 degrees of freedom
# Null hypothesis probability = 7.877162e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.258e-09 3.326e-09
25- 50 9.189e-09 5.700e-09
50-150 1.535e-08 1.199e-08
15-150 2.979e-08 2.016e-08
Double BB
R1^2/D10^2 : 6.62383E-05 (-5.11291e-05 0.000474958)
kT2 [keV] : 8.56696 (-3.34132 4.81456)
R2^2/D10^2 : 0.338260 (-0.240838 2.07486)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.27 using 59 PHA bins.
#Fit statistic : Chi-Squared = 70.92 using 59 PHA bins.
#Fit statistic : Chi-Squared = 70.51 using 59 PHA bins.
# Reduced chi-squared = 1.332 for 55 degrees of freedom
# Reduced chi-squared = 1.290 for 55 degrees of freedom
# Reduced chi-squared = 1.282 for 55 degrees of freedom
# Null hypothesis probability = 5.031306e-02
# Null hypothesis probability = 7.288718e-02
# Null hypothesis probability = 7.757032e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.312e-09 3.958e-09
25- 50 8.841e-09 4.813e-09
50-150 1.123e-08 7.830e-09
15-150 2.538e-08 1.480e-08
Plot creation:
Wed Jan 11 06:27:12 EST 2017