batgrbproduct Analysis for Trigger=718766
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): Sun Oct 23 17:48:43 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger718766/GCN5_download_cron
======================================================================
Trigger: 00718766 Segment: 000
BAT Trigger Time: 498861952 [s; MET]
Trigger Stop: 498862712 [s; MET]
UTC: 2016-10-22T20:45:34.952900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 256.004814298341 Dec: -37.8528428428997 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 17.25
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 17.25
Flight Position: [ source = BAT ]
RA: 256.004814298341 Dec: -37.8528428428997 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 255.981423432556 Dec: -37.835775615812 [deg; J2000]
{ 17h 03m 55.5s , -37d 50' 08.8" }
+/- 1.87273896110848 [arcmin] (estimated 90% radius based on SNR)
+/- 0.887053801335101 [arcmin] (formal 1-sigma fit error)
SNR: 12.4126689197718
Angular difference between Flight and Ground position is 1.508949 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 760 +/-
Measured from: 0
to: 760 [s; relative to TRIGTIME]
T50: 760 +/-
Measured from: 0
to: 760 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 760 second)
Measured from: 0
to: 760 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 760 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.182582 3.724145 0.529824 -0.280577
0.188984 0.166464 0.141490 0.129508 [error]
Peak 5.182582 3.724145 0.529824 -0.280577
0.188984 0.166464 0.141490 0.129508 [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 1.81e-06 1.38e-06 7.02e-07 5.13e-07 4.13e-06 4.40e-06 erg/cm2
Error 1.43e-07 9.27e-08 1.03e-07 1.40e-07 2.60e-07 3.15e-07 erg/cm2
Peak flux Power-law 7.94e-02 3.40e-02 8.65e-03 2.70e-03 1.24e-01 1.25e-01 ph/cm2/s
Error 6.43e-03 2.20e-03 1.23e-03 6.95e-04 7.53e-03 7.51e-03 ph/cm2/s
Fluence Cutoff-PL 1.63e-06 1.54e-06 4.00e-07 1.80e-08 3.59e-06 3.59e-06 erg/cm2
Error 1.64e-07 1.17e-07 1.42e-07 3.41e-08 2.77e-07 2.79e-07 erg/cm2
Peak flux Cutoff-PL 7.02e-02 3.83e-02 5.32e-03 1.30e-04 1.14e-01 1.14e-01 ph/cm2/s
Error 7.51e-03 2.83e-03 1.73e-03 2.32e-04 8.30e-03 8.31e-03 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 2.974 0.147 - - 4.58e-04 4.90e-05 67.870 57
CPL 0.896 1.011 17.3 8.6 1.04e-02 2.91e-02 48.670 56
The chi2 of BB fit is 61.02 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 2.974 0.147 - - 4.58e-04 4.90e-05 67.870 57
CPL 0.896 1.011 17.3 8.6 1.04e-02 2.91e-02 48.670 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 760.000 0.000 760.000
T90 760.000 0.000 760.000
T50 760.000 0.000 760.000
Peak 760.000 0.000 760.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
255.9814 -37.8358 0.0154 22.3 -158.7 9.0131 12.4 TRIG_00718766
------------------------------------------
Foreground time interval of the image:
0.000 414.780 (delta_t = 414.780 [sec])
416.000 760.000 (delta_t = 344.000 [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
Multiple GTIs in the spectrum
tstart tstop
0.000000 414.780000
416.000000 760.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.97410 ( -0.144265 0.150385 )
Norm@50keV : 4.58109E-04 ( -4.87297e-05 4.93283e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.87 using 59 PHA bins.
# Reduced chi-squared = 1.191 for 57 degrees of freedom
# Null hypothesis probability = 1.536475e-01
Photon flux (15-150 keV) in 758.8 sec: 0.123638 ( -0.00751328 0.00753719 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.12761e-06 ( -2.5906e-07 2.61685e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 414.780000
416.000000 760.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.896239 ( -1.11313 0.90976 )
Epeak [keV] : 17.3009 ( -11.8761 5.31424 )
Norm@50keV : 1.04352E-02 ( -0.0105591 0.0475476 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.67 using 59 PHA bins.
# Reduced chi-squared = 0.8692 for 56 degrees of freedom
# Null hypothesis probability = 7.457627e-01
Photon flux (15-150 keV) in 758.8 sec: 0.113899 ( -0.008278 0.008326 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5928e-06 ( -2.68228e-07 2.85468e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 414.780000
416.000000 760.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.904386 ( -0.898308 1.95834 )
beta : -9.37167 ( 9.37167 19.3694 )
Epeak [keV] : 17.2615 ( -8.8948 5.24276 )
Norm@50keV : 1.02831E-02 ( -0.0102843 0.267605 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.67 using 59 PHA bins.
# Reduced chi-squared = 0.8850 for 55 degrees of freedom
# Null hypothesis probability = 7.134969e-01
Photon flux (15-150 keV) in 758.8 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] : 6.34847 (-0.373641 0.39653)
R^2/D10^2 : 0.325723 (-0.0800373 0.107336)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.02 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 57 degrees of freedom
# Null hypothesis probability = 3.334228e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.429e-06 1.377e-07
25- 50 1.608e-06 1.351e-07
50-150 1.845e-07 4.564e-08
15-150 3.221e-06 1.999e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.8873 (-2.36404 2.76477)
Norm : 1.37357 (-0.207457 0.251309)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.36 using 59 PHA bins.
# Reduced chi-squared = 0.8659 for 57 degrees of freedom
# Null hypothesis probability = 7.541345e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.676e-06 1.457e-07
25- 50 1.516e-06 1.070e-07
50-150 4.881e-07 1.203e-07
15-150 3.680e-06 2.413e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.40435 (-2.14162 1.22716)
R1^2/D10^2 : 1.08321 (-0.60963 23.0992)
kT2 [keV] : 9.25690 (-2.34005 5.39013)
R2^2/D10^2 : 3.45188E-02 (-0.0320464 0.163284)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.01 using 59 PHA bins.
# Reduced chi-squared = 0.8912 for 55 degrees of freedom
# Null hypothesis probability = 7.015029e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.613e-06 7.998e-07
25- 50 1.535e-06 7.770e-07
50-150 4.204e-07 2.389e-07
15-150 3.568e-06 1.778e-06
Peak spectrum fit
Power-law model
Time interval is from 416.000 sec. to 760.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.97410 ( -0.144265 0.150385 )
Norm@50keV : 4.58109E-04 ( -4.87297e-05 4.93283e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.87 using 59 PHA bins.
# Reduced chi-squared = 1.191 for 57 degrees of freedom
# Null hypothesis probability = 1.536475e-01
Photon flux (15-150 keV) in 758.8 sec: 0.123638 ( -0.00751328 0.00753719 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.12761e-06 ( -2.5906e-07 2.61685e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 416.000 sec. to 760.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.896239 ( -1.11313 0.90976 )
Epeak [keV] : 17.3009 ( -11.8761 5.31424 )
Norm@50keV : 1.04352E-02 ( -0.0105591 0.0475476 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.67 using 59 PHA bins.
# Reduced chi-squared = 0.8692 for 56 degrees of freedom
# Null hypothesis probability = 7.457627e-01
Photon flux (15-150 keV) in 758.8 sec: 0.113899 ( -0.008278 0.008326 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5928e-06 ( -2.68228e-07 2.85468e-07 ) ergs/cm2
Band function
Time interval is from 416.000 sec. to 760.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.904386 ( -0.898308 1.95834 )
beta : -9.37167 ( 9.37167 19.3694 )
Epeak [keV] : 17.2615 ( -8.93926 5.24272 )
Norm@50keV : 1.02831E-02 ( -0.0102843 0.269164 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.67 using 59 PHA bins.
# Reduced chi-squared = 0.8850 for 55 degrees of freedom
# Null hypothesis probability = 7.134969e-01
Photon flux (15-150 keV) in 758.8 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] : 6.34847 (-0.373641 0.39653)
R^2/D10^2 : 0.325723 (-0.0800373 0.107336)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.02 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 57 degrees of freedom
# Null hypothesis probability = 3.334228e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.429e-06 1.525e-07
25- 50 1.608e-06 1.218e-07
50-150 1.845e-07 4.534e-08
15-150 3.221e-06 2.041e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.8873 (-2.36404 2.76477)
Norm : 1.37357 (-0.207457 0.251309)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.36 using 59 PHA bins.
# Reduced chi-squared = 0.8659 for 57 degrees of freedom
# Null hypothesis probability = 7.541345e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.676e-06 1.351e-07
25- 50 1.516e-06 1.256e-07
50-150 4.881e-07 1.079e-07
15-150 3.680e-06 2.421e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.40435 (-2.14162 1.22716)
R1^2/D10^2 : 1.08321 (-0.60963 23.0992)
kT2 [keV] : 9.25690 (-2.34005 5.39013)
R2^2/D10^2 : 3.45188E-02 (-0.0320464 0.163284)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.01 using 59 PHA bins.
# Reduced chi-squared = 0.8912 for 55 degrees of freedom
# Null hypothesis probability = 7.015029e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.613e-06 8.404e-07
25- 50 1.535e-06 7.785e-07
50-150 4.204e-07 2.488e-07
15-150 3.568e-06 1.787e-06
Plot creation:
Sun Oct 23 17:54:52 EDT 2016