batgrbproduct Analysis for Trigger=716876
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 Oct 11 20:37:12 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger716876/batgroup_hand_proc
======================================================================
Trigger: 00716876 Segment: 000
BAT Trigger Time: 497858111.104 [s; MET]
Trigger Stop: 497858113.152 [s; MET]
UTC: 2016-10-11T05:54:54.113800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.710556686154 Dec: 8.32611886348883 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.98
Image Trigger?: NO
Rate S/N Ratio: 11 [ if not an image trigger ]
Image S/N Ratio: 6.98
Flight Position: [ source = BAT ]
RA: 245.710556686154 Dec: 8.32611886348883 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.6871008266 Dec: 8.31312799802578 [deg; J2000]
{ 16h 22m 44.9s , +08d 18' 47.3" }
+/- 2.37180330227411 [arcmin] (estimated 90% radius based on SNR)
+/- 1.28196841229385 [arcmin] (formal 1-sigma fit error)
SNR: 8.85710329091067
Angular difference between Flight and Ground position is 1.595843 arcmin
Partial Coding Fraction: 0.4375 [ including projection effects ]
Duration
T90: 4.25600004196167 +/- 1.26521460527088
Measured from: -0.0879999995231628
to: 4.16800004243851 [s; relative to TRIGTIME]
T50: 1.82400000095367 +/- 1.35275723246339
Measured from: 0.904000043869019
to: 2.72800004482269 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.37200003862381
to: 2.37200003862381 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.343999981880188
to: 4.42400002479553 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.048067 0.114179 0.102026 0.026786
0.023034 0.020405 0.017576 0.014419 [error]
Peak 0.021971 0.037347 0.027559 0.002833
0.010583 0.009573 0.008239 0.006401 [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 2.02e-08 4.62e-08 8.35e-08 3.58e-07 2.27e-07 5.08e-07 erg/cm2
Error 8.50e-09 1.16e-08 1.64e-08 1.69e-07 4.29e-08 1.73e-07 erg/cm2
Peak flux Power-law 3.10e-01 2.88e-01 1.86e-01 1.85e-01 8.60e-01 9.69e-01 ph/cm2/s
Error 1.49e-01 8.99e-02 6.49e-02 1.29e-01 2.60e-01 2.78e-01 ph/cm2/s
Fluence Cutoff-PL 1.99e-08 4.64e-08 8.42e-08 3.29e-07 2.27e-07 4.80e-07 erg/cm2
Error 9.51e-09 9.22e-09 1.87e-08 2.73e-07 4.42e-08 2.36e-07 erg/cm2
Peak flux Cutoff-PL 1.85e-01 3.53e-01 2.00e-01 2.05e-02 7.57e-01 7.59e-01 ph/cm2/s
Error 1.79e-01 1.20e-01 8.73e-02 1.04e-01 2.79e-01 2.89e-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 1.146 0.346 - - 4.63e-03 9.06e-04 40.270 57
CPL 1.081 0.259 806.6 0.0 4.94e-03 8.77e-03 40.270 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 1.633 0.478 - - 6.63e-03 1.94e-03 58.460 57
CPL -1.223 4.593 53.1 -20.1 1.95e-01 7.68e+01 55.930 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: 1.856000 sec.
T50 in the 50-300 keV band: 1.024000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 4.768 -0.344 4.424
T90 4.256 -0.088 4.168
T50 1.824 0.904 2.728
Peak 1.000 1.372 2.372
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.6871 8.3131 0.0218 42.1847 -29.3337 0.3336086 8.857 TRIG_00716876
Foreground time interval of the image:
-0.344 4.424 (delta_t = 4.768 [sec])
Background time interval of the image:
-647.903 -627.573 (delta_t = 20.330 [sec])
-239.104 -0.344 (delta_t = 238.760 [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 -0.344 sec. to 4.424 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14604 ( -0.360965 0.331951 )
Norm@50keV : 4.62666E-03 ( -0.000915255 0.000895917 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.27 using 59 PHA bins.
# Reduced chi-squared = 0.7066 for 57 degrees of freedom
# Null hypothesis probability = 9.543564e-01
Photon flux (15-150 keV) in 4.768 sec: 0.539314 ( -0.112789 0.115028 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.27364e-07 ( -4.27945e-08 4.29469e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.344 sec. to 4.424 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08143 ( -1.59918 -1.08167 )
Epeak [keV] : 806.637 ( -844.963 -844.963 )
Norm@50keV : 4.94200E-03 ( -0.00114336 0.016397 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.27 using 59 PHA bins.
# Reduced chi-squared = 0.7191 for 56 degrees of freedom
# Null hypothesis probability = 9.440386e-01
Photon flux (15-150 keV) in 4.768 sec: 0.537600 ( -0.116619 0.115115 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26898e-07 ( -4.51077e-08 4.3324e-08 ) ergs/cm2
Band function
Time interval is from -0.344 sec. to 4.424 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.66629 ( -4.66629 -4.66629 )
beta : -1.28412 ( -0.442395 0.419993 )
Epeak [keV] : 33.8080 ( -33.808 18.2176 )
Norm@50keV : 37.9914 ( -6.9705 1.56867e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.45 using 59 PHA bins.
# Reduced chi-squared = 0.7173 for 55 degrees of freedom
# Null hypothesis probability = 9.435873e-01
Photon flux (15-150 keV) in 4.768 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] : 21.1148 (-4.99541 7.74951)
R^2/D10^2 : 2.06281E-02 (-0.0131629 0.0310327)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.45 using 59 PHA bins.
# Reduced chi-squared = 0.8149 for 57 degrees of freedom
# Null hypothesis probability = 8.396296e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.265e-09 3.270e-09
25- 50 4.263e-08 1.647e-08
50-150 1.417e-07 5.109e-08
15-150 1.926e-07 6.372e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-59.1957 -200)
Norm : 2.37270 (-0.450939 0.450939)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.80 using 59 PHA bins.
# Reduced chi-squared = 0.7860 for 57 degrees of freedom
# Null hypothesis probability = 8.793893e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.820e-08 1.626e-08
25- 50 5.424e-08 3.106e-08
50-150 1.190e-07 6.856e-08
15-150 2.014e-07 1.158e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.5576 (-4.32923 6.08368)
R1^2/D10^2 : 0.143112 (-0.0953727 0.446876)
kT2 [keV] : 52.8595 (-31.7572 -67.6335)
R2^2/D10^2 : 9.61260E-04 (-0.000432202 0.00730743)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.72 using 59 PHA bins.
# Reduced chi-squared = 0.7040 for 55 degrees of freedom
# Null hypothesis probability = 9.529175e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.708e-08 1.091e-08
25- 50 5.197e-08 3.123e-08
50-150 1.519e-07 8.296e-08
15-150 2.209e-07 1.134e-07
Peak spectrum fit
Power-law model
Time interval is from 1.372 sec. to 2.372 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63260 ( -0.474778 0.481566 )
Norm@50keV : 6.62765E-03 ( -0.00194295 0.00192967 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.46 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 57 degrees of freedom
# Null hypothesis probability = 4.216696e-01
Photon flux (15-150 keV) in 1 sec: 0.860403 ( -0.258595 0.262283 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.17526e-08 ( -1.86213e-08 1.89273e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.372 sec. to 2.372 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.22334 ( -6.18904 2.99674 )
Epeak [keV] : 53.1112 ( -12.8231 -53.0271 )
Norm@50keV : 0.195217 ( -0.206809 153.352 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.93 using 59 PHA bins.
# Reduced chi-squared = 0.9987 for 56 degrees of freedom
# Null hypothesis probability = 4.775786e-01
Photon flux (15-150 keV) in 1 sec: 0.757236 ( -0.272772 0.285454 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.12736e-08 ( -1.71859e-08 2.15208e-08 ) ergs/cm2
Band function
Time interval is from 1.372 sec. to 2.372 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.57181 ( -1.51405 -1.51405 )
beta : -3.70791 ( 3.66556 3.51163 )
Epeak [keV] : 52.2665 ( -44.4733 87.5121 )
Norm@50keV : 0.291302 ( -0.237866 17.2431 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.75 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 55 degrees of freedom
# Null hypothesis probability = 4.463356e-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] : 13.5130 (-3.0961 4.31367)
R^2/D10^2 : 0.147567 (-0.0963245 0.239685)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.90 using 59 PHA bins.
# Reduced chi-squared = 0.9808 for 57 degrees of freedom
# Null hypothesis probability = 5.162538e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.707e-09 3.432e-09
25- 50 2.048e-08 1.043e-08
50-150 2.416e-08 1.623e-08
15-150 5.035e-08 3.167e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 147.563 (-91.1006 -144.491)
Norm : 3.59276 (-1.11153 1.80208)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.69 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 57 degrees of freedom
# Null hypothesis probability = 4.494385e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.240e-09 5.500e-09
25- 50 1.709e-08 1.001e-08
50-150 3.350e-08 2.175e-08
15-150 5.982e-08 3.669e-08
Double BB
R1^2/D10^2 : 4.41393E-05 (-4.41171e-05 -4.41171e-05)
kT2 [keV] : 12.3561 (-2.87379 4.5661)
R2^2/D10^2 : 0.190048 (-0.127527 0.372306)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.85 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.07 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.04 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 55 degrees of freedom
# Reduced chi-squared = 1.001 for 55 degrees of freedom
# Reduced chi-squared = 1.001 for 55 degrees of freedom
# Null hypothesis probability = 4.428547e-01
# Null hypothesis probability = 4.718968e-01
# Null hypothesis probability = 4.730527e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.526e-09 3.891e-09
25- 50 2.007e-08 1.252e-08
50-150 2.478e-08 1.669e-08
15-150 5.138e-08 3.248e-08
Plot creation:
Tue Oct 11 20:49:29 EDT 2016