batgrbproduct analysis for trigger=762535
batgrbproduct Analysis for Trigger=762535
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): Fri Jul 14 19:09:48 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger762535/batgroup_hand_proc
======================================================================
Trigger: 00762535 Segment: 000
BAT Trigger Time: 521727952 [s; MET]
Trigger Stop: 521728272 [s; MET]
UTC: 2017-07-14T12:25:32.632340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 34.3206186211749 Dec: 1.98718338129198 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.63
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.63
Flight Position: [ source = BAT ]
RA: 34.3206186211749 Dec: 1.98718338129198 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 34.3219055418608 Dec: 1.96203092948455 [deg; J2000]
{ 02h 17m 17.3s , +01d 57' 43.3" }
+/- 2.23693218337058 [arcmin] (estimated 90% radius based on SNR)
+/- 0.768999709833208 [arcmin] (formal 1-sigma fit error)
SNR: 9.62973540974212
Angular difference between Flight and Ground position is 1.511119 arcmin
Partial Coding Fraction: 0.6171875 [ including projection effects ]
Duration
T90: 419.679999947548 +/- 92.5864471189302
Measured from: 0.276000022888184
to: 419.955999970436 [s; relative to TRIGTIME]
T50: 212.239999949932 +/- 67.4963938644466
Measured from: 89.5799999833107
to: 301.819999933243 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 262.879999995232
to: 263.879999995232 [s; relative to TRIGTIME]
Total Fluence
Measured from: -72.944000005722
to: 464.371999979019 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.512128 1.926240 1.110960 0.347201
0.148433 0.148866 0.132582 0.120028 [error]
Peak 0.012484 0.015938 0.020072 0.008595
0.006714 0.006832 0.006257 0.005610 [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 4.84e-07 7.60e-07 9.00e-07 2.07e-06 2.75e-06 4.21e-06 erg/cm2
Error 6.95e-08 6.97e-08 1.31e-07 6.20e-07 3.02e-07 7.42e-07 erg/cm2
Peak flux Power-law 1.32e-01 1.34e-01 9.49e-02 1.07e-01 4.03e-01 4.68e-01 ph/cm2/s
Error 8.03e-02 5.48e-02 4.81e-02 1.25e-01 1.60e-01 1.91e-01 ph/cm2/s
Fluence Cutoff-PL 4.65e-07 7.87e-07 9.05e-07 1.24e-06 2.67e-06 3.40e-06 erg/cm2
Error 8.02e-08 8.89e-08 1.37e-07 1.40e-06 3.42e-07 9.88e-07 erg/cm2
Peak flux Cutoff-PL 6.14e-02 1.64e-01 1.15e-01 1.12e-02 3.50e-01 3.52e-01 ph/cm2/s
Error 9.03e-02 8.79e-02 6.80e-02 7.60e-02 1.75e-01 1.87e-01 ph/cm2/s
Fluence Band 4.63e-07 7.80e-07 9.05e-07 1.36e-06 2.68e-06 3.52e-06 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 1.757 0.173 - - 5.54e-04 5.82e-05 62.840 57
CPL 1.454 0.541 82.9 0.0 8.07e-04 0.00e+00 62.210 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 1.492 0.668 - - 3.23e-03 1.34e-03 69.180 57
CPL -1.734 0.882 57.8 -20.2 1.24e-01 4.85e+02 66.980 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 537.316 -72.944 464.372
T90 419.680 0.276 419.956
T50 212.240 89.580 301.820
Peak 1.000 262.880 263.880
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
34.3219 1.9620 0.0200 24.0877 112.4002 3.3814053 9.630 TRIG_00762535
Foreground time interval of the image:
-11.899 336.701 (delta_t = 348.600 [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
Time interval is from -72.944 sec. to 464.372 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75718 ( -0.170109 0.176041 )
Norm@50keV : 5.53930E-04 ( -5.87718e-05 5.77145e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.84 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 57 degrees of freedom
# Null hypothesis probability = 2.771872e-01
Photon flux (15-150 keV) in 537.3 sec: 7.50999E-02 ( -0.0069282 0.00693251 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.74522e-06 ( -2.99153e-07 3.04076e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -72.944 sec. to 464.372 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45356 ( -0.739746 0.342 )
Epeak [keV] : 82.8506 ( )
Norm@50keV : 8.07175E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.21 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 56 degrees of freedom
# Null hypothesis probability = 2.646953e-01
Photon flux (15-150 keV) in 537.3 sec: 7.39945E-02 ( -0.0073127 0.0072979 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.66715e-06 ( -3.40073e-07 3.44356e-07 ) ergs/cm2
Band function
Time interval is from -72.944 sec. to 464.372 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.45428 ( -0.369085 0.448022 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 82.9243 ( -33.2981 -82.9243 )
Norm@50keV : 8.06333E-04 ( -0.000303239 0.00118322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.21 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 55 degrees of freedom
# Null hypothesis probability = 2.349895e-01
Photon flux (15-150 keV) in 537.3 sec: 7.43049E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.68219e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.1894 (-1.39721 1.58661)
R^2/D10^2 : 1.68576E-02 (-0.0060521 0.00944177)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.94 using 59 PHA bins.
# Reduced chi-squared = 1.560 for 57 degrees of freedom
# Null hypothesis probability = 4.326991e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.850e-07 4.734e-08
25- 50 9.134e-07 1.085e-07
50-150 8.245e-07 1.870e-07
15-150 2.023e-06 2.359e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 117.903 (-38.3128 67.1653)
Norm : 0.316106 (-0.0358942 0.0475696)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.47 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 57 degrees of freedom
# Null hypothesis probability = 2.881760e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.427e-07 5.548e-08
25- 50 7.895e-07 1.034e-07
50-150 1.397e-06 5.763e-07
15-150 2.629e-06 6.773e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.40492 (-1.85132 2.19592)
R1^2/D10^2 : 0.211215 (-0.146165 0.461886)
kT2 [keV] : 19.6872 (-4.4021 8.92774)
R2^2/D10^2 : 2.33449E-03 (-0.00177793 0.00408241)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.19 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 55 degrees of freedom
# Null hypothesis probability = 2.095432e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.674e-07 2.203e-07
25- 50 7.587e-07 2.998e-07
50-150 1.350e-06 7.312e-07
15-150 2.576e-06 1.087e-06
Peak spectrum fit
Power-law model
Time interval is from 262.880 sec. to 263.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49195 ( -0.642484 0.694375 )
Norm@50keV : 3.23307E-03 ( -0.00136167 0.00132675 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.18 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 57 degrees of freedom
# Null hypothesis probability = 1.292315e-01
Photon flux (15-150 keV) in 1 sec: 0.402755 ( -0.15981 0.160301 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.07087e-08 ( -1.35042e-08 1.42359e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 262.880 sec. to 263.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.73436 ( 1.80021 3.56501 )
Epeak [keV] : 57.8360 ( -17.2264 -57.6551 )
Norm@50keV : 0.124309 ( -0.165341 969.598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.98 using 59 PHA bins.
# Reduced chi-squared = 1.196 for 56 degrees of freedom
# Null hypothesis probability = 1.495098e-01
Photon flux (15-150 keV) in 1 sec: 0.350415 ( -0.175614 0.174324 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.58852e-08 ( -1.13195e-08 1.44587e-08 ) ergs/cm2
Band function
Time interval is from 262.880 sec. to 263.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.66493 ( -2.82944 -1.14354 )
beta : -9.99998 ( 9.99998 3.27664e-05 )
Epeak [keV] : 57.9500 ( -17.0677 457.703 )
Norm@50keV : 0.116203 ( -0.116203 3.76011 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.98 using 59 PHA bins.
# Reduced chi-squared = 1.218 for 55 degrees of freedom
# Null hypothesis probability = 1.289504e-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] : 14.9289 (-4.38821 6.68651)
R^2/D10^2 : 5.18400E-02 (-0.0518323 0.119801)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.91 using 59 PHA bins.
# Reduced chi-squared = 1.174 for 57 degrees of freedom
# Null hypothesis probability = 1.734135e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.421e-09 1.602e-09
25- 50 9.576e-09 5.980e-09
50-150 1.450e-08 1.038e-08
15-150 2.649e-08 1.736e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 195.729 (-189.768 -189.768)
Norm : 1.67285 (-0.654591 0.905288)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.74 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 57 degrees of freedom
# Null hypothesis probability = 1.371247e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.175e-09 2.586e-09
25- 50 8.015e-09 5.185e-09
50-150 1.747e-08 1.128e-08
15-150 2.966e-08 1.922e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.91149 (-2.87999 54.622)
R1^2/D10^2 : 5.91700 (-6.68502 -6.68502)
kT2 [keV] : 15.5027 (-4.76337 -15.4561)
R2^2/D10^2 : 4.40343E-02 (-0.0444052 0.119403)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.71 using 59 PHA bins.
# Reduced chi-squared = 1.213 for 55 degrees of freedom
# Null hypothesis probability = 1.338440e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.119e-09 1.606e-09
25- 50 9.137e-09 5.745e-09
50-150 1.496e-08 1.016e-08
15-150 2.721e-08 1.843e-08
Plot creation:
Fri Jul 14 19:20:08 EDT 2017