batgrbproduct analysis for trigger=755867
batgrbproduct Analysis for Trigger=755867
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 Jun 5 17:26:00 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger755867/GCN5_download_cron
======================================================================
Trigger: 00755867 Segment: 000
BAT Trigger Time: 518296149.568 [s; MET]
Trigger Stop: 518296153.664 [s; MET]
UTC: 2017-06-04T19:08:50.402040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 342.645334010525 Dec: -15.4143151566099 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.97
Image Trigger?: NO
Rate S/N Ratio: 30.6267856622271 [ if not an image trigger ]
Image S/N Ratio: 7.97
Flight Position: [ source = BAT ]
RA: 342.645334010525 Dec: -15.4143151566099 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 342.645243341297 Dec: -15.4055889097699 [deg; J2000]
{ 22h 50m 34.9s , -15d 24' 20.1" }
+/- 1.35573227658851 [arcmin] (estimated 90% radius based on SNR)
+/- 0.620297684051737 [arcmin] (formal 1-sigma fit error)
SNR: 19.6923919822704
Angular difference between Flight and Ground position is 0.523601 arcmin
Partial Coding Fraction: 0.08789062 [ including projection effects ]
Duration
T90: 26.7040000557899 +/- 6.21442968027873
Measured from: -10.2879999279976
to: 16.4160001277924 [s; relative to TRIGTIME]
T50: 8.84800004959106 +/- 1.08823528142607
Measured from: -3.91999989748001
to: 4.92800015211105 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.6599999666214
to: 3.6599999666214 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.6640000343323
to: 22.5759999752045 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.425458 2.223822 2.290134 1.086537
0.146551 0.160677 0.146831 0.130610 [error]
Peak 0.106299 0.200330 0.177896 0.076626
0.029060 0.033624 0.029978 0.024218 [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 5.47e-07 1.13e-06 1.83e-06 6.64e-06 5.07e-06 1.01e-05 erg/cm2
Error 7.62e-08 9.45e-08 1.44e-07 1.17e-06 3.66e-07 1.25e-06 erg/cm2
Peak flux Power-law 1.61e+00 1.39e+00 8.24e-01 7.31e-01 4.15e+00 4.56e+00 ph/cm2/s
Error 4.92e-01 3.02e-01 1.81e-01 2.73e-01 8.97e-01 9.30e-01 ph/cm2/s
Fluence Cutoff-PL 5.40e-07 1.14e-06 1.84e-06 6.11e-06 5.06e-06 9.62e-06 erg/cm2
Error 9.02e-08 1.01e-07 1.63e-07 2.17e-06 3.29e-07 2.17e-06 erg/cm2
Peak flux Cutoff-PL 1.07e+00 1.58e+00 1.16e+00 4.10e-01 4.11e+00 4.22e+00 ph/cm2/s
Error 5.55e-01 3.71e-01 3.02e-01 -------- 8.90e-01 9.20e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.21e+00 1.54e+00 1.10e+00 5.16e-01 4.18e+00 4.35e+00 ph/cm2/s
Error -------- -------- -------- -------- 8.54e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.307 0.121 - - 1.50e-02 1.04e-03 72.480 57
CPL 1.216 0.294 451.2 0.0 1.65e-02 5.69e-03 72.480 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.758 0.256 - - 3.06e-02 6.12e-03 71.950 57
CPL 0.170 1.232 72.9 22.3 1.50e-01 2.63e-01 65.530 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: 26.560000 sec.
T50 in the 50-300 keV band: 8.192000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 34.240 -11.664 22.576
T90 26.704 -10.288 16.416
T50 8.848 -3.920 4.928
Peak 1.000 2.660 3.660
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
342.6452 -15.4056 0.0098 52.4 165.5 7.1523 19.7 TRIG_00755867
------------------------------------------
Foreground time interval of the image:
-11.664 22.576 (delta_t = 34.240 [sec])
Background time interval of the image:
-239.568 -11.664 (delta_t = 227.904 [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 -11.664 sec. to 22.576 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30666 ( -0.122217 0.120485 )
Norm@50keV : 1.49977E-02 ( -0.00104478 0.00104282 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.48 using 59 PHA bins.
# Reduced chi-squared = 1.272 for 57 degrees of freedom
# Null hypothesis probability = 8.120466e-02
Photon flux (15-150 keV) in 34.24 sec: 1.79147 ( -0.135237 0.135748 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.06632e-06 ( -3.65577e-07 3.66166e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.664 sec. to 22.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21596 ( -0.464859 0.123841 )
Epeak [keV] : 451.230 ( -681.362 -681.362 )
Norm@50keV : 1.65101E-02 ( -0.00187027 0.00951407 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.48 using 59 PHA bins.
# Reduced chi-squared = 1.294 for 56 degrees of freedom
# Null hypothesis probability = 6.837808e-02
Photon flux (15-150 keV) in 34.24 sec: 1.78648 ( -0.13835 0.13843 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.05711e-06 ( -3.76503e-07 2.81076e-07 ) ergs/cm2
Band function
Time interval is from -11.664 sec. to 22.576 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97535 ( -4.69 -4.97535 )
beta : -1.38936 ( -0.139074 0.136719 )
Epeak [keV] : 26.9014 ( -5.24066 4.24354 )
Norm@50keV : 830.570 ( -57.1144 2411.61 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.23 using 59 PHA bins.
# Reduced chi-squared = 1.222 for 55 degrees of freedom
# Null hypothesis probability = 1.246090e-01
Photon flux (15-150 keV) in 34.24 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] : 19.3527 ( )
R^2/D10^2 : 8.78713E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 127.37 using 59 PHA bins.
# Reduced chi-squared = 2.2345 for 57 degrees of freedom
# Null hypothesis probability = 2.701853e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.200e-07 3.422e-08
25- 50 1.072e-06 1.075e-07
50-150 2.960e-06 3.208e-07
15-150 4.252e-06 3.390e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-16.7246 -200)
Norm : 7.62260 (-0.533344 0.533344)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.52 using 59 PHA bins.
# Reduced chi-squared = 1.518 for 57 degrees of freedom
# Null hypothesis probability = 7.055580e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.498e-07 5.324e-08
25- 50 1.250e-06 1.263e-07
50-150 2.742e-06 8.005e-07
15-150 4.641e-06 8.914e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.00869 (-1.65172 2.04821)
R1^2/D10^2 : 1.14190 (-0.557684 1.21423)
kT2 [keV] : 35.1360 (-7.39175 15.133)
R2^2/D10^2 : 9.77248E-03 (-0.00614579 0.0109039)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.91 using 59 PHA bins.
# Reduced chi-squared = 1.253 for 55 degrees of freedom
# Null hypothesis probability = 9.831064e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.122e-07 1.942e-07
25- 50 1.178e-06 4.557e-07
50-150 3.289e-06 1.603e-06
15-150 4.979e-06 1.919e-06
Peak spectrum fit
Power-law model
Time interval is from 2.660 sec. to 3.660 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75801 ( -0.248952 0.263062 )
Norm@50keV : 3.05729E-02 ( -0.00611987 0.00611647 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.95 using 59 PHA bins.
# Reduced chi-squared = 1.262 for 57 degrees of freedom
# Null hypothesis probability = 8.772097e-02
Photon flux (15-150 keV) in 1 sec: 4.14635 ( -0.893802 0.899712 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.81981e-07 ( -5.67461e-08 5.67494e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.660 sec. to 3.660 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.170275 ( -1.3724 1.09076 )
Epeak [keV] : 72.8847 ( -15.4349 29.2235 )
Norm@50keV : 0.150373 ( -0.150373 0.375616 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.53 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 56 degrees of freedom
# Null hypothesis probability = 1.798756e-01
Photon flux (15-150 keV) in 1 sec: 4.10891 ( -0.88457 0.89522 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.1132e-07 ( -6.0688e-08 6.0696e-08 ) ergs/cm2
Band function
Time interval is from 2.660 sec. to 3.660 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.175807 ( -1.162 1.37685 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 72.9555 ( -15.4747 28.492 )
Norm@50keV : 0.149471 ( -0.149471 0.377031 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.53 using 59 PHA bins.
# Reduced chi-squared = 1.191 for 55 degrees of freedom
# Null hypothesis probability = 1.565783e-01
Photon flux (15-150 keV) in 1 sec: 4.18362 ( 2.81638 -0.86738 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.16374e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.1623 (-3.36249 3.52179)
R^2/D10^2 : 0.271038 (-0.134277 0.291161)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.20 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 57 degrees of freedom
# Null hypothesis probability = 1.289761e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.785e-08 6.726e-09
25- 50 8.310e-08 2.569e-08
50-150 1.994e-07 6.350e-08
15-150 3.004e-07 8.175e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 140.942 (-56.259 -138.923)
Norm : 17.8736 (-3.98323 4.90098)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.42 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 57 degrees of freedom
# Null hypothesis probability = 1.430349e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.613e-08 1.432e-08
25- 50 8.472e-08 3.731e-08
50-150 1.629e-07 1.030e-07
15-150 2.937e-07 1.535e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.80858 (-2.72869 5.99578)
R1^2/D10^2 : 3.80519 (-3.37173 77.4921)
kT2 [keV] : 21.9847 (-4.56589 8.0885)
R2^2/D10^2 : 0.110346 (-0.0882913 0.181495)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.31 using 59 PHA bins.
# Reduced chi-squared = 1.169 for 55 degrees of freedom
# Null hypothesis probability = 1.828982e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.738e-08 2.128e-08
25- 50 8.787e-08 4.933e-08
50-150 1.938e-07 1.151e-07
15-150 3.190e-07 1.709e-07
Plot creation:
Mon Jun 5 17:59:00 EDT 2017