batgrbproduct analysis for trigger=765008
batgrbproduct Analysis for Trigger=765008
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): Sat Jul 29 02:02:47 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger765008/GCN5_download_cron
======================================================================
Trigger: 00765008 Segment: 000
BAT Trigger Time: 522917628.224 [s; MET]
Trigger Stop: 522917629.248 [s; MET]
UTC: 2017-07-28T06:53:28.786200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 58.8977966424924 Dec: 12.1531504042179 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.37
Image Trigger?: NO
Rate S/N Ratio: 13.6014705087354 [ if not an image trigger ]
Image S/N Ratio: 8.37
Flight Position: [ source = BAT ]
RA: 58.8977966424924 Dec: 12.1531504042179 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 58.9012765245156 Dec: 12.1687065783704 [deg; J2000]
{ 03h 55m 36.3s , +12d 10' 07.3" }
+/- 2.12929640367281 [arcmin] (estimated 90% radius based on SNR)
+/- 1.13423418020988 [arcmin] (formal 1-sigma fit error)
SNR: 10.332600456184
Angular difference between Flight and Ground position is 0.955427 arcmin
Partial Coding Fraction: 0.734375 [ including projection effects ]
Duration
T90: 1.25199991464615 +/- 0.233649318060114
Measured from: 0.228000164031982
to: 1.48000007867813 [s; relative to TRIGTIME]
T50: 0.527999937534332 +/- 0.20870068097482
Measured from: 0.608000159263611
to: 1.13600009679794 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.196000039577484
to: 1.19600003957748 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.168000042438507
to: 1.56400001049042 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.056698 0.074683 0.027598 -0.000453
0.008586 0.008895 0.007511 0.006167 [error]
Peak 0.041296 0.062532 0.022666 -0.000895
0.007394 0.007639 0.006472 0.005221 [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 1.88e-08 2.53e-08 2.50e-08 4.45e-08 8.35e-08 1.14e-07 erg/cm2
Error 3.63e-09 3.91e-09 6.52e-09 2.20e-08 1.55e-08 3.02e-08 erg/cm2
Peak flux Power-law 4.81e-01 3.63e-01 1.82e-01 1.31e-01 1.09e+00 1.16e+00 ph/cm2/s
Error 1.03e-01 5.95e-02 4.88e-02 6.42e-02 1.77e-01 1.92e-01 ph/cm2/s
Fluence Cutoff-PL 1.61e-08 3.33e-08 1.98e-08 1.96e-09 7.10e-08 7.11e-08 erg/cm2
Error 4.29e-09 6.12e-09 8.60e-09 5.37e-09 1.38e-08 1.46e-08 erg/cm2
Peak flux Cutoff-PL 3.84e-01 4.77e-01 1.63e-01 9.28e-03 1.03e+00 1.03e+00 ph/cm2/s
Error 1.27e-01 9.24e-02 6.35e-02 2.31e-02 1.77e-01 1.78e-01 ph/cm2/s
Fluence Band 1.60e-08 3.31e-08 2.00e-08 2.03e-09 7.12e-08 7.13e-08 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 2.015 0.262 - - 6.48e-03 1.27e-03 60.760 57
CPL -0.491 1.809 38.6 7.3 2.08e-01 1.96e+00 51.370 56
The chi2 of BB fit is 52.14 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 1.992 0.280 - - 7.27e-03 1.51e-03 68.370 57
CPL -0.614 2.007 40.1 8.0 2.49e-01 2.94e+00 60.060 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 1.396 0.168 1.564
T90 1.252 0.228 1.480
T50 0.528 0.608 1.136
Peak 1.000 0.196 1.196
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
58.9013 +12.1687 0.0186 18.9 97.8 0.1718 10.3 TRIG_00765008
------------------------------------------
Foreground time interval of the image:
0.168 1.564 (delta_t = 1.396 [sec])
Background time interval of the image:
-239.224 0.168 (delta_t = 239.392 [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 0.168 sec. to 1.564 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01516 ( -0.250691 0.272432 )
Norm@50keV : 6.48463E-03 ( -0.00128075 0.00125511 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.76 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 57 degrees of freedom
# Null hypothesis probability = 3.422190e-01
Photon flux (15-150 keV) in 1.396 sec: 0.979541 ( -0.147754 0.147753 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.35443e-08 ( -1.52486e-08 1.57916e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.168 sec. to 1.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.491332 ( -2.08768 1.52947 )
Epeak [keV] : 38.6279 ( -6.36233 8.28399 )
Norm@50keV : 0.207701 ( -0.213788 3.71178 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.37 using 59 PHA bins.
# Reduced chi-squared = 0.9174 for 56 degrees of freedom
# Null hypothesis probability = 6.504210e-01
Photon flux (15-150 keV) in 1.396 sec: 0.935593 ( -0.14603 0.147017 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.10173e-08 ( -1.28383e-08 1.4841e-08 ) ergs/cm2
Band function
Time interval is from 0.168 sec. to 1.564 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.437205 ( -1.4569 2.0856 )
beta : -9.37167 ( 9.37167 19.371 )
Epeak [keV] : 38.8714 ( -6.61799 8.06216 )
Norm@50keV : 0.190786 ( -0.190858 8.04842 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.38 using 59 PHA bins.
# Reduced chi-squared = 0.9342 for 55 degrees of freedom
# Null hypothesis probability = 6.137329e-01
Photon flux (15-150 keV) in 1.396 sec: 0.938277 ( 6.06172 -0.147665 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.1194e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.83226 (-1.30904 1.49645)
R^2/D10^2 : 0.531716 (-0.224551 0.383918)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.14 using 59 PHA bins.
# Reduced chi-squared = 0.9147 for 57 degrees of freedom
# Null hypothesis probability = 6.576607e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.453e-08 3.436e-09
25- 50 3.526e-08 7.154e-09
50-150 1.752e-08 5.964e-09
15-150 6.730e-08 1.399e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 58.0110 (-18.5753 33.4424)
Norm : 5.35229 (-1.13053 1.39089)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.43 using 59 PHA bins.
# Reduced chi-squared = 0.9725 for 57 degrees of freedom
# Null hypothesis probability = 5.340982e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.867e-08 3.448e-09
25- 50 2.812e-08 5.661e-09
50-150 3.110e-08 1.336e-08
15-150 7.790e-08 1.887e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.31231 (-3.31167 -3.31167)
R1^2/D10^2 : 8.66434 (-8.67334 -8.67334)
kT2 [keV] : 10.6322 (-1.82891 -10.632)
R2^2/D10^2 : 0.367547 (-0.367585 0.441646)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.05 using 59 PHA bins.
# Reduced chi-squared = 0.9282 for 55 degrees of freedom
# Null hypothesis probability = 6.261987e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.610e-08 8.250e-09
25- 50 3.336e-08 1.875e-08
50-150 2.022e-08 1.243e-08
15-150 6.969e-08 3.721e-08
Peak spectrum fit
Power-law model
Time interval is from 0.196 sec. to 1.196 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99204 ( -0.267719 0.293078 )
Norm@50keV : 7.27251E-03 ( -0.00152822 0.00149228 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.37 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 57 degrees of freedom
# Null hypothesis probability = 1.439686e-01
Photon flux (15-150 keV) in 1 sec: 1.08690 ( -0.176752 0.176757 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.70342e-08 ( -1.31084e-08 1.35686e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.196 sec. to 1.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.613747 ( -2.34242 1.67227 )
Epeak [keV] : 40.1389 ( -6.88281 9.08425 )
Norm@50keV : 0.248889 ( -0.257859 5.63061 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.06 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 56 degrees of freedom
# Null hypothesis probability = 3.308639e-01
Photon flux (15-150 keV) in 1 sec: 1.03355 ( -0.176557 0.17748 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.74791e-08 ( -1.09945e-08 1.27115e-08 ) ergs/cm2
Band function
Time interval is from 0.196 sec. to 1.196 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.577753 ( -1.62787 2.34978 )
beta : -9.37167 ( 9.36953 19.3688 )
Epeak [keV] : 40.1676 ( -6.52776 9.06477 )
Norm@50keV : 0.237339 ( -0.247595 5.75128 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.06 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 55 degrees of freedom
# Null hypothesis probability = 2.973985e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.73162e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.2636 (-1.43137 1.64027)
R^2/D10^2 : 0.505780 (-0.220166 0.384844)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.41 using 59 PHA bins.
# Reduced chi-squared = 1.060 for 57 degrees of freedom
# Null hypothesis probability = 3.536024e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.094e-08 3.349e-09
25- 50 2.821e-08 6.630e-09
50-150 1.587e-08 6.177e-09
15-150 5.502e-08 1.204e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 61.1517 (-20.8912 40.1972)
Norm : 5.80222 (-1.28861 1.60515)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.92 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 57 degrees of freedom
# Null hypothesis probability = 2.465950e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.463e-08 3.080e-09
25- 50 2.239e-08 5.085e-09
50-150 2.588e-08 1.208e-08
15-150 6.290e-08 1.877e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.09020 (-2.41408 37.6152)
R1^2/D10^2 : 185.723 (-74.6416 -74.6416)
kT2 [keV] : 10.8334 (-1.71383 -10.9122)
R2^2/D10^2 : 0.394828 (-0.380182 0.332958)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.82 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 55 degrees of freedom
# Null hypothesis probability = 3.374102e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.215e-08 4.262e-09
25- 50 2.684e-08 9.165e-09
50-150 1.753e-08 8.853e-09
15-150 5.652e-08 1.905e-08
Plot creation:
Sat Jul 29 02:12:47 EDT 2017