batgrbproduct Analysis for Trigger=731183
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): Tue Jan 10 09:25:29 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger731183/GCN5_download_cron
======================================================================
Trigger: 00731183 Segment: 000
BAT Trigger Time: 505653064 [s; MET]
Trigger Stop: 505653128 [s; MET]
UTC: 2017-01-09T11:10:45.565780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 259.882394312664 Dec: -24.9935284069051 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 12.55
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 12.55
Flight Position: [ source = BAT ]
RA: 259.882394312664 Dec: -24.9935284069051 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 259.892109347791 Dec: -25.0054042441153 [deg; J2000]
{ 17h 19m 34.1s , -25d 00' 19.5" }
+/- 1.25370884252754 [arcmin] (estimated 90% radius based on SNR)
+/- 0.498936508357955 [arcmin] (formal 1-sigma fit error)
SNR: 22.0210181926693
Angular difference between Flight and Ground position is 0.887028 arcmin
Partial Coding Fraction: 0.734375 [ including projection effects ]
Duration
T90: 425.855999946594 +/- 22.5125518836167
Measured from: -22.2919998764992
to: 403.564000070095 [s; relative to TRIGTIME]
T50: 239.839999973774 +/- 17.4757607047065
Measured from: 64.052000105381
to: 303.892000079155 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 346.047999978065
to: 347.047999978065 [s; relative to TRIGTIME]
Total Fluence
Measured from: -49.227999985218
to: 429.796000003815 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.639847 4.564246 2.632775 0.344108
0.179292 0.161106 0.133895 0.112829 [error]
Peak 0.020793 0.028190 0.015852 0.012987
0.007919 0.007198 0.006114 0.005106 [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 1.21e-06 1.82e-06 2.06e-06 4.42e-06 6.41e-06 9.51e-06 erg/cm2
Error 9.18e-08 8.30e-08 1.34e-07 6.11e-07 3.11e-07 7.18e-07 erg/cm2
Peak flux Power-law 1.84e-01 1.88e-01 1.36e-01 1.56e-01 5.69e-01 6.64e-01 ph/cm2/s
Error 9.35e-02 6.00e-02 4.88e-02 1.19e-01 1.70e-01 1.95e-01 ph/cm2/s
Fluence Cutoff-PL 1.11e-06 1.91e-06 2.08e-06 2.11e-06 6.12e-06 7.20e-06 erg/cm2
Error 1.10e-07 1.01e-07 1.44e-07 1.02e-06 3.63e-07 1.09e-06 erg/cm2
Peak flux Cutoff-PL 1.68e-01 1.99e-01 1.40e-01 7.83e-02 5.54e-01 5.85e-01 ph/cm2/s
Error 1.05e-01 7.25e-02 5.61e-02 1.11e-01 1.76e-01 2.30e-01 ph/cm2/s
Fluence Band 1.08e-06 1.93e-06 2.00e-06 3.55e-06 6.19e-06 8.57e-06 erg/cm2
Error 1.51e-07 -------- 1.72e-07 2.25e-06 -------- -------- 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 1.824 0.084 - - 1.46e-03 6.96e-05 57.530 57
CPL 1.319 0.352 63.9 22.7 2.67e-03 1.15e-03 50.700 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.472 0.517 - - 4.59e-03 1.35e-03 65.790 57
CPL 0.886 2.132 90.7 0.0 9.30e-03 1.38e-01 65.520 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 479.024 -49.228 429.796
T90 425.856 -22.292 403.564
T50 239.840 64.052 303.892
Peak 1.000 346.048 347.048
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
259.8921 -25.0054 0.0088 21.6 -100.6 9.3517 22.0 TRIG_00731183
------------------------------------------
Foreground time interval of the image:
-15.599 172.420 (delta_t = 188.019 [sec])
174.000 356.501 (delta_t = 182.501 [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
-49.228000 172.420000
174.000000 429.796000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82375 ( -0.0838882 0.0847727 )
Norm@50keV : 1.45986E-03 ( -6.98088e-05 6.94514e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.53 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.556056e-01
Photon flux (15-150 keV) in 477.4 sec: 0.203048 ( -0.00952373 0.00954997 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.41143e-06 ( -3.10236e-07 3.11762e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-49.228000 172.420000
174.000000 429.796000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31882 ( -0.366089 0.33699 )
Epeak [keV] : 63.9442 ( -10.7896 34.631 )
Norm@50keV : 2.66791E-03 ( -0.000865544 0.00143396 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.70 using 59 PHA bins.
# Reduced chi-squared = 0.9054 for 56 degrees of freedom
# Null hypothesis probability = 6.750102e-01
Photon flux (15-150 keV) in 477.4 sec: 0.196462 ( -0.010383 0.010408 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.1216e-06 ( -3.61774e-07 3.63492e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-49.228000 172.420000
174.000000 429.796000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31880 ( -0.255105 0.47051 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 63.9319 ( -10.7951 34.6247 )
Norm@50keV : 2.66762E-03 ( -0.000865335 0.00143513 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.70 using 59 PHA bins.
# Reduced chi-squared = 0.9218 for 55 degrees of freedom
# Null hypothesis probability = 6.394480e-01
Photon flux (15-150 keV) in 477.4 sec: 0.197712 ( 6.80229 -0.011965 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.18548e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.3534 ( )
R^2/D10^2 : 4.18107E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 145.26 using 59 PHA bins.
# Reduced chi-squared = 2.5484 for 57 degrees of freedom
# Null hypothesis probability = 1.203121e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.455e-07 5.753e-08
25- 50 2.101e-06 1.210e-07
50-150 1.965e-06 1.879e-07
15-150 4.711e-06 2.229e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9878 (-15.7202 21.0469)
Norm : 0.885164 (-0.0592311 0.065344)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.67 using 59 PHA bins.
# Reduced chi-squared = 0.8889 for 57 degrees of freedom
# Null hypothesis probability = 7.100646e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.105e-06 9.787e-08
25- 50 1.910e-06 1.022e-07
50-150 3.095e-06 8.211e-07
15-150 6.109e-06 8.713e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.65004 (-0.940911 0.998493)
R1^2/D10^2 : 0.281666 (-0.106778 0.204118)
kT2 [keV] : 22.1208 (-3.12199 4.50781)
R2^2/D10^2 : 3.52670E-03 (-0.00182002 0.00301441)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.24 using 59 PHA bins.
# Reduced chi-squared = 0.8953 for 55 degrees of freedom
# Null hypothesis probability = 6.932377e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.055e-06 1.678e-07
25- 50 1.924e-06 3.022e-07
50-150 3.103e-06 6.920e-07
15-150 6.082e-06 9.885e-07
Peak spectrum fit
Power-law model
Time interval is from 346.048 sec. to 347.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47247 ( -0.521656 0.513337 )
Norm@50keV : 4.58738E-03 ( -0.00135855 0.00134681 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.79 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 57 degrees of freedom
# Null hypothesis probability = 1.986942e-01
Photon flux (15-150 keV) in 1 sec: 0.568558 ( -0.169522 0.17083 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.37206e-08 ( -1.38002e-08 1.42215e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 346.048 sec. to 347.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.886434 ( -2.82926 1.43535 )
Epeak [keV] : 90.7307 ( -90.7328 -90.7328 )
Norm@50keV : 9.30142E-03 ( -0.00930124 0.267189 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.52 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 56 degrees of freedom
# Null hypothesis probability = 1.800706e-01
Photon flux (15-150 keV) in 1 sec: 0.553710 ( -0.1764 0.176571 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.13593e-08 ( -1.54141e-08 1.58549e-08 ) ergs/cm2
Band function
Time interval is from 346.048 sec. to 347.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94844 ( -4.94844 -4.94844 )
beta : -1.74570 ( -0.906718 0.632962 )
Epeak [keV] : 28.4259 ( -28.4259 68.6701 )
Norm@50keV : 218.871 ( -61.8121 2.93577e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.10 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 55 degrees of freedom
# Null hypothesis probability = 1.876498e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.1784e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.5981 (-4.763 7.62249)
R^2/D10^2 : 7.04743E-02 (-0.0702932 0.220282)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.65 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 57 degrees of freedom
# Null hypothesis probability = 1.579935e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.157e-09 1.965e-09
25- 50 1.223e-08 7.435e-09
50-150 1.752e-08 1.183e-08
15-150 3.291e-08 2.002e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 2.34256 (-0.677066 0.88354)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.63 using 59 PHA bins.
# Reduced chi-squared = 1.151 for 57 degrees of freedom
# Null hypothesis probability = 2.026225e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.833e-09 3.555e-09
25- 50 1.122e-08 6.790e-09
50-150 2.461e-08 1.512e-08
15-150 4.166e-08 2.580e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.79263 (-6.71597 -6.71597)
R1^2/D10^2 : 0.661685 (-0.678836 14.2942)
kT2 [keV] : 24.6858 (-24.7452 -24.7452)
R2^2/D10^2 : 8.65289E-03 (-0.00872616 0.0988019)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.98 using 59 PHA bins.
# Reduced chi-squared = 1.181 for 55 degrees of freedom
# Null hypothesis probability = 1.680670e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.671e-09 3.636e-09
25- 50 1.133e-08 6.395e-09
50-150 2.444e-08 1.623e-08
15-150 4.144e-08 2.142e-08
Plot creation:
Tue Jan 10 09:32:47 EST 2017