batgrbproduct analysis for trigger=871316
batgrbproduct Analysis for Trigger=871316
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 Nov 10 17:54:32 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger871316/batgroup_hand_proc
======================================================================
Trigger: 00871316 Segment: 000
BAT Trigger Time: 563532233.216 [s; MET]
Trigger Stop: 563532234.24 [s; MET]
UTC: 2018-11-10T08:43:31.319640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 302.342535673998 Dec: -36.902699253889 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.48
Image Trigger?: NO
Rate S/N Ratio: 12.8840987267251 [ if not an image trigger ]
Image S/N Ratio: 7.48
Flight Position: [ source = BAT ]
RA: 302.342535673998 Dec: -36.902699253889 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 302.330123559643 Dec: -36.8781732848984 [deg; J2000]
{ 20h 09m 19.2s , -36d 52' 41.4" }
+/- 1.41270866791035 [arcmin] (estimated 90% radius based on SNR)
+/- 0.582905752057834 [arcmin] (formal 1-sigma fit error)
SNR: 18.56767427053
Angular difference between Flight and Ground position is 1.587529 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 138.424000024796 +/- 10.9277832336458
Measured from: -39.2680000066757
to: 99.1560000181198 [s; relative to TRIGTIME]
T50: 47.1999999284744 +/- 1.64099964656047
Measured from: 7.29200005531311
to: 54.4919999837875 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 25.0320000648499
to: 26.0320000648499 [s; relative to TRIGTIME]
Total Fluence
Measured from: -109.304000020027
to: 129.808000087738 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.698434 7.402611 3.795633 0.692785
0.121710 0.121605 0.104181 0.092860 [error]
Peak 0.157004 0.176677 0.100426 0.026498
0.009986 0.010588 0.008450 0.006579 [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 2.22e-06 2.98e-06 2.95e-06 5.24e-06 9.86e-06 1.34e-05 erg/cm2
Error 1.08e-07 7.93e-08 1.12e-07 4.46e-07 2.54e-07 5.13e-07 erg/cm2
Peak flux Power-law 1.50e+00 1.23e+00 6.80e-01 5.54e-01 3.66e+00 3.97e+00 ph/cm2/s
Error 1.59e-01 8.41e-02 7.02e-02 1.12e-01 2.52e-01 2.71e-01 ph/cm2/s
Fluence Cutoff-PL 2.17e-06 3.00e-06 2.95e-06 4.43e-06 9.75e-06 1.26e-05 erg/cm2
Error 1.07e-07 8.49e-08 1.14e-07 1.06e-06 2.50e-07 1.21e-06 erg/cm2
Peak flux Cutoff-PL 1.43e+00 1.28e+00 6.87e-01 3.38e-01 3.60e+00 3.74e+00 ph/cm2/s
Error 1.83e-01 1.09e-01 7.47e-02 2.20e-01 2.63e-01 3.53e-01 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 2.017 0.054 - - 4.47e-03 1.20e-04 65.880 57
CPL 1.907 0.222 41.4 -2.4 5.06e-03 1.27e-03 65.150 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 1.853 0.125 - - 2.60e-02 2.04e-03 33.460 57
CPL 1.476 0.500 62.2 -22.6 4.20e-02 2.96e-02 31.720 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: 119.744000 sec.
T50 in the 50-300 keV band: 36.672000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 239.112 -109.304 129.808
T90 138.424 -39.268 99.156
T50 47.200 7.292 54.492
Peak 1.000 25.032 26.032
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
302.3301 -36.8782 0.0104 11.0722 165.6238 8.1671786 18.568 TRIG_00871316
Foreground time interval of the image:
-109.304 17.685 (delta_t = 126.989 [sec])
Background time interval of the image:
-130.315 -109.304 (delta_t = 21.011 [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 -109.304 sec. to 129.808 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01691 ( -0.0542556 0.05467 )
Norm@50keV : 4.46586E-03 ( -0.000119892 0.000119284 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.88 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 57 degrees of freedom
# Null hypothesis probability = 1.967202e-01
Photon flux (15-150 keV) in 239.1 sec: 0.675140 ( -0.0198031 0.0199367 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.85637e-06 ( -2.53556e-07 2.54149e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -109.304 sec. to 129.808 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90718 ( -0.228315 0.215866 )
Epeak [keV] : 41.4392 ( -36.5659 -41.4392 )
Norm@50keV : 5.06242E-03 ( -0.0010724 0.00147292 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.15 using 59 PHA bins.
# Reduced chi-squared = 1.163 for 56 degrees of freedom
# Null hypothesis probability = 1.883820e-01
Photon flux (15-150 keV) in 239.1 sec: 0.667629 ( -0.024295 0.024318 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.74837e-06 ( -3.35194e-07 1.65122e-07 ) ergs/cm2
Band function
Time interval is from -109.304 sec. to 129.808 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.67119 ( 1.67385 3.20585 )
beta : -2.08265 ( 2.08242 0.0983455 )
Epeak [keV] : 37.8946 ( -37.9458 35.8305 )
Norm@50keV : 6.98989E-03 ( -0.00214838 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.17 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 55 degrees of freedom
# Null hypothesis probability = 1.860557e-01
Photon flux (15-150 keV) in 239.1 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] : 11.9422 ( )
R^2/D10^2 : 0.143130 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 380.25 using 59 PHA bins.
# Reduced chi-squared = 6.6711 for 57 degrees of freedom
# Null hypothesis probability = 2.581595e-49
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.032e-06 5.655e-08
25- 50 3.229e-06 9.803e-08
50-150 2.760e-06 1.650e-07
15-150 7.021e-06 1.973e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 77.3742 (-6.68517 7.73514)
Norm : 3.04014 (-0.146132 0.156147)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.87 using 59 PHA bins.
# Reduced chi-squared = 1.436 for 57 degrees of freedom
# Null hypothesis probability = 1.709435e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.882e-06 7.364e-08
25- 50 3.073e-06 8.368e-08
50-150 4.240e-06 2.343e-07
15-150 9.194e-06 2.546e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.62519 (-0.653253 0.682301)
R1^2/D10^2 : 1.01584 (-0.299517 0.488447)
kT2 [keV] : 22.6693 (-2.5382 3.46846)
R2^2/D10^2 : 9.01646E-03 (-0.00379055 0.00554216)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.17 using 59 PHA bins.
# Reduced chi-squared = 1.585 for 55 degrees of freedom
# Null hypothesis probability = 3.721825e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.814e-06 1.667e-07
25- 50 3.067e-06 1.674e-07
50-150 4.445e-06 4.124e-07
15-150 9.326e-06 6.061e-07
Peak spectrum fit
Power-law model
Time interval is from 25.032 sec. to 26.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85331 ( -0.123128 0.1264 )
Norm@50keV : 2.59946E-02 ( -0.00204921 0.0020228 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.46 using 59 PHA bins.
# Reduced chi-squared = 0.5870 for 57 degrees of freedom
# Null hypothesis probability = 9.945790e-01
Photon flux (15-150 keV) in 1 sec: 3.65874 ( -0.252159 0.252326 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39006e-07 ( -1.87979e-08 1.89753e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 25.032 sec. to 26.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47559 ( -0.548655 0.450878 )
Epeak [keV] : 62.1642 ( -17.0578 -62.1645 )
Norm@50keV : 4.19900E-02 ( -0.0175627 0.0415785 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.72 using 59 PHA bins.
# Reduced chi-squared = 0.5665 for 56 degrees of freedom
# Null hypothesis probability = 9.963369e-01
Photon flux (15-150 keV) in 1 sec: 3.60101 ( -0.2629 0.26244 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.309e-07 ( -2.1445e-08 2.163e-08 ) ergs/cm2
Band function
Time interval is from 25.032 sec. to 26.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.415634 ( -0.408517 -0.408517 )
beta : -1.96208 ( 1.96216 0.176879 )
Epeak [keV] : 28.6482 ( -28.7008 45.1628 )
Norm@50keV : 1.10654 ( -1.06532 2474.02 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.20 using 59 PHA bins.
# Reduced chi-squared = 0.5672 for 55 degrees of freedom
# Null hypothesis probability = 9.959880e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32887e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.2579 (-0.929525 1.01838)
R^2/D10^2 : 1.09581 (-0.304379 0.419422)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.54 using 59 PHA bins.
# Reduced chi-squared = 1.378 for 57 degrees of freedom
# Null hypothesis probability = 3.085572e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.914e-08 3.395e-09
25- 50 8.487e-08 6.850e-09
50-150 6.183e-08 1.042e-08
15-150 1.758e-07 1.425e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 90.1932 (-19.4867 29.2946)
Norm : 16.5493 (-1.63509 1.87299)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.99 using 59 PHA bins.
# Reduced chi-squared = 0.5612 for 57 degrees of freedom
# Null hypothesis probability = 9.970069e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.318e-08 4.840e-09
25- 50 7.307e-08 5.615e-09
50-150 1.114e-07 3.535e-08
15-150 2.277e-07 3.945e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.09466 (-1.30344 1.49231)
R1^2/D10^2 : 7.36080 (-3.7762 10.2639)
kT2 [keV] : 20.8667 (-4.36689 8.40663)
R2^2/D10^2 : 7.86335E-02 (-0.0562692 0.0686381)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.87 using 59 PHA bins.
# Reduced chi-squared = 0.5976 for 55 degrees of freedom
# Null hypothesis probability = 9.922471e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.363e-08 1.254e-08
25- 50 7.152e-08 1.702e-08
50-150 1.114e-07 5.494e-08
15-150 2.266e-07 7.228e-08
Plot creation:
Sat Nov 10 18:01:14 EST 2018