batgrbproduct analysis for trigger=766821
batgrbproduct Analysis for Trigger=766821
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 Aug 8 17:13:24 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger766821/GCN5_download_cron
======================================================================
Trigger: 00766821 Segment: 000
BAT Trigger Time: 523835788.608 [s; MET]
Trigger Stop: 523835789.12 [s; MET]
UTC: 2017-08-07T21:56:09.115840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 143.379449689179 Dec: -17.3293730191527 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.17
Image Trigger?: NO
Rate S/N Ratio: 14.247806848775 [ if not an image trigger ]
Image S/N Ratio: 7.17
Flight Position: [ source = BAT ]
RA: 143.379449689179 Dec: -17.3293730191527 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 143.434041643979 Dec: -17.3477581004696 [deg; J2000]
{ 09h 33m 44.2s , -17d 20' 51.9" }
+/- 1.54699372738997 [arcmin] (estimated 90% radius based on SNR)
+/- 0.682464095763161 [arcmin] (formal 1-sigma fit error)
SNR: 16.3087414407909
Angular difference between Flight and Ground position is 3.315564 arcmin
Partial Coding Fraction: 0.921875 [ including projection effects ]
Duration
T90: 48.4960000514984 +/- 11.6966566241448
Measured from: 0.184000134468079
to: 48.6800001859665 [s; relative to TRIGTIME]
T50: 28.6240000128746 +/- 5.78076808696013
Measured from: 1.96000015735626
to: 30.5840001702309 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.73199999332428
to: 1.73199999332428 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.423999965190887
to: 53.0800000429153 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.518700 0.654928 0.341798 0.041463
0.043835 0.044601 0.037687 0.032037 [error]
Peak 0.052117 0.071887 0.048953 0.016387
0.006734 0.007158 0.006293 0.004788 [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 1.61e-07 2.43e-07 2.76e-07 5.95e-07 8.57e-07 1.27e-06 erg/cm2
Error 1.96e-08 1.98e-08 3.57e-08 1.55e-07 8.31e-08 1.91e-07 erg/cm2
Peak flux Power-law 4.69e-01 4.71e-01 3.32e-01 3.71e-01 1.42e+00 1.64e+00 ph/cm2/s
Error 8.61e-02 5.50e-02 5.00e-02 1.12e-01 1.60e-01 1.92e-01 ph/cm2/s
Fluence Cutoff-PL 1.47e-07 2.68e-07 2.69e-07 1.60e-07 7.86e-07 8.44e-07 erg/cm2
Error 2.23e-08 2.74e-08 4.18e-08 1.66e-07 9.44e-08 1.92e-07 erg/cm2
Peak flux Cutoff-PL 4.59e-01 4.81e-01 3.35e-01 2.94e-01 1.41e+00 1.57e+00 ph/cm2/s
Error 7.02e-02 6.56e-02 5.30e-02 1.79e-01 1.62e-01 2.48e-01 ph/cm2/s
Fluence Band 1.44e-07 2.70e-07 2.61e-07 2.87e-07 7.93e-07 9.65e-07 erg/cm2
Error 2.34e-08 3.10e-08 -------- 2.94e-07 -------- -------- erg/cm2
Peak flux Band 2.03e-02 2.33e-02 1.56e-02 8.08e-03 6.41e-02 6.72e-02 ph/cm2/s
Error -------- -------- -------- -------- 9.58e-02 1.32e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.819 0.148 - - 1.74e-03 1.65e-04 53.140 57
CPL 0.945 0.704 52.2 19.5 5.38e-03 6.07e-03 47.420 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.505 0.193 - - 1.13e-02 1.35e-03 66.120 57
CPL 1.336 0.544 185.1 0.0 1.40e-02 1.31e-02 65.920 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: 11.264000 sec.
T50 in the 50-300 keV band: 3.968000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 53.504 -0.424 53.080
T90 48.496 0.184 48.680
T50 28.624 1.960 30.584
Peak 1.000 0.732 1.732
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
143.4340 -17.3478 0.0118 14.3 -116.5 1.4951 16.3 TRIG_00766821
------------------------------------------
Foreground time interval of the image:
-0.424 53.080 (delta_t = 53.504 [sec])
Background time interval of the image:
-214.007 -0.424 (delta_t = 213.583 [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 -0.424 sec. to 53.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81899 ( -0.145606 0.150096 )
Norm@50keV : 1.74128E-03 ( -0.000166486 0.000164198 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.14 using 59 PHA bins.
# Reduced chi-squared = 0.9322 for 57 degrees of freedom
# Null hypothesis probability = 6.207982e-01
Photon flux (15-150 keV) in 53.5 sec: 0.241733 ( -0.0198379 0.0198466 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.57113e-07 ( -8.24874e-08 8.37409e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.424 sec. to 53.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.945114 ( -0.766205 0.64128 )
Epeak [keV] : 52.2327 ( -9.5552 29.3513 )
Norm@50keV : 5.38360E-03 ( -0.00299137 0.0091481 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.42 using 59 PHA bins.
# Reduced chi-squared = 0.8468 for 56 degrees of freedom
# Null hypothesis probability = 7.859029e-01
Photon flux (15-150 keV) in 53.5 sec: 0.233015 ( -0.020747 0.02076 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.85728e-07 ( -9.22875e-08 9.65461e-08 ) ergs/cm2
Band function
Time interval is from -0.424 sec. to 53.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.945022 ( -0.484643 1.08577 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 52.2219 ( -9.55203 29.3515 )
Norm@50keV : 5.38396E-03 ( -0.00299207 0.00914424 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.42 using 59 PHA bins.
# Reduced chi-squared = 0.8622 for 55 degrees of freedom
# Null hypothesis probability = 7.562835e-01
Photon flux (15-150 keV) in 53.5 sec: 0.234465 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.93293e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.1128 (-1.01944 1.14435)
R^2/D10^2 : 7.75492E-02 (-0.0238989 0.0338938)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.06 using 59 PHA bins.
# Reduced chi-squared = 1.176 for 57 degrees of freedom
# Null hypothesis probability = 1.702451e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.073e-07 1.704e-08
25- 50 3.073e-07 3.028e-08
50-150 2.160e-07 4.547e-08
15-150 6.306e-07 6.634e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 90.2117 (-22.5486 36.9342)
Norm : 1.10008 (-0.124941 0.146205)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.15 using 59 PHA bins.
# Reduced chi-squared = 0.8448 for 57 degrees of freedom
# Null hypothesis probability = 7.917555e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.536e-07 1.899e-08
25- 50 2.599e-07 2.351e-08
50-150 3.963e-07 1.551e-07
15-150 8.098e-07 1.495e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.72885 (-2.12866 2.06913)
R1^2/D10^2 : 0.318833 (-0.174853 0.448717)
kT2 [keV] : 19.8203 (-5.40721 13.5491)
R2^2/D10^2 : 5.98921E-03 (-0.0052118 0.0179404)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.47 using 59 PHA bins.
# Reduced chi-squared = 0.8630 for 55 degrees of freedom
# Null hypothesis probability = 7.547823e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.432e-07 5.856e-08
25- 50 2.712e-07 1.045e-07
50-150 3.723e-07 1.929e-07
15-150 7.867e-07 3.075e-07
Peak spectrum fit
Power-law model
Time interval is from 0.732 sec. to 1.732 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50522 ( -0.191641 0.19436 )
Norm@50keV : 1.13432E-02 ( -0.00135238 0.0013382 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.12 using 59 PHA bins.
# Reduced chi-squared = 1.160 for 57 degrees of freedom
# Null hypothesis probability = 1.909705e-01
Photon flux (15-150 keV) in 1 sec: 1.41807 ( -0.160252 0.160312 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07516e-07 ( -1.40619e-08 1.42512e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.732 sec. to 1.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33635 ( -0.734195 0.353146 )
Epeak [keV] : 185.113 ( -185.12 -185.12 )
Norm@50keV : 1.39894E-02 ( -0.00588866 0.0202798 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.92 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 56 degrees of freedom
# Null hypothesis probability = 1.711486e-01
Photon flux (15-150 keV) in 1 sec: 1.41054 ( -0.16271 0.16187 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0592e-07 ( -1.56788e-08 1.5322e-08 ) ergs/cm2
Band function
Time interval is from 0.732 sec. to 1.732 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5.42238 -5 )
beta : -1.71664 ( -0.316284 0.247173 )
Epeak [keV] : 26.8417 ( -5.62769 4.41895 )
Norm@50keV : 833.901 ( -92.5056 2673.06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.22 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 55 degrees of freedom
# Null hypothesis probability = 2.626433e-01
Photon flux (15-150 keV) in 1 sec: 6.40835E-02 ( 6.93592 -0.0640835 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.59522e-09 ( -4.58822e-09 -4.59522e-09 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.4901 (-1.99624 2.62668)
R^2/D10^2 : 0.301495 (-0.14658 0.260393)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.98 using 59 PHA bins.
# Reduced chi-squared = 1.561 for 57 degrees of freedom
# Null hypothesis probability = 4.295189e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.971e-09 2.056e-09
25- 50 3.286e-08 4.340e-09
50-150 3.163e-08 8.815e-09
15-150 7.446e-08 1.158e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-78.1046 -199.363)
Norm : 5.80609 (-0.650942 0.651509)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.02 using 59 PHA bins.
# Reduced chi-squared = 1.158 for 57 degrees of freedom
# Null hypothesis probability = 1.934472e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.446e-08 8.105e-09
25- 50 2.781e-08 1.526e-08
50-150 6.099e-08 3.390e-08
15-150 1.033e-07 5.685e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.56085 (-1.42926 1.70309)
R1^2/D10^2 : 1.37265 (-0.691125 1.48154)
kT2 [keV] : 35.7357 (-11.1719 33.9154)
R2^2/D10^2 : 6.35061E-03 (-0.0053499 0.0166094)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.83 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Null hypothesis probability = 3.048073e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.469e-08 6.021e-09
25- 50 2.892e-08 1.256e-08
50-150 6.620e-08 3.635e-08
15-150 1.098e-07 4.751e-08
Plot creation:
Tue Aug 8 17:18:37 EDT 2017