batgrbproduct analysis for trigger=868312
batgrbproduct Analysis for Trigger=868312
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 Oct 23 21:11:38 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger868312/GCN5_download_cron
======================================================================
Trigger: 00868312 Segment: 000
BAT Trigger Time: 561922234.944 [s; MET]
Trigger Stop: 561922240.448 [s; MET]
UTC: 2018-10-22T17:30:13.147700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 56.7952243531036 Dec: -29.3323371797094 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.23
Image Trigger?: NO
Rate S/N Ratio: 13.0384048104053 [ if not an image trigger ]
Image S/N Ratio: 7.23
Flight Position: [ source = BAT ]
RA: 56.7952243531036 Dec: -29.3323371797094 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 56.8310869578789 Dec: -29.3418039296244 [deg; J2000]
{ 03h 47m 19.5s , -29d 20' 30.5" }
+/- 3.05815681189068 [arcmin] (estimated 90% radius based on SNR)
+/- 1.44515652033363 [arcmin] (formal 1-sigma fit error)
SNR: 6.16033670887298
Angular difference between Flight and Ground position is 1.959911 arcmin
Partial Coding Fraction: 1.03125 [ including projection effects ]
Duration
T90: 7.87199997901917 +/- 2.60077841116735
Measured from: -1.08799993991852
to: 6.78400003910065 [s; relative to TRIGTIME]
T50: 3.63599991798401 +/- 1.79021448846422
Measured from: 1.32000017166138
to: 4.95600008964539 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.40400004386902
to: 5.40400004386902 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.01600003242493
to: 7.96399998664856 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.055337 0.084626 0.093960 0.056052
0.020787 0.022069 0.020532 0.018948 [error]
Peak 0.009497 0.015515 0.024125 0.017460
0.006507 0.007154 0.006987 0.006166 [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 1.32e-08 3.36e-08 6.88e-08 3.55e-07 1.85e-07 4.71e-07 erg/cm2
Error 6.53e-09 1.00e-08 1.88e-08 2.34e-07 4.98e-08 2.43e-07 erg/cm2
Peak flux Power-law 1.09e-01 1.31e-01 1.15e-01 1.72e-01 4.15e-01 5.27e-01 ph/cm2/s
Error 6.93e-02 5.47e-02 5.16e-02 1.60e-01 1.58e-01 2.19e-01 ph/cm2/s
Fluence Cutoff-PL 1.18e-08 3.47e-08 7.20e-08 1.91e-07 1.80e-07 3.10e-07 erg/cm2
Error 7.99e-09 1.11e-08 2.22e-08 2.06e-07 5.34e-08 1.98e-07 erg/cm2
Peak flux Cutoff-PL 5.86e-02 1.45e-01 1.43e-01 4.06e-02 3.79e-01 3.88e-01 ph/cm2/s
Error 8.07e-02 9.05e-02 -------- 1.51e-01 1.71e-01 2.40e-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 0.968 0.443 - - 1.70e-03 4.18e-04 59.540 57
CPL 0.493 1.010 179.5 0.0 2.78e-03 1.24e-02 59.300 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.192 0.640 - - 3.54e-03 1.35e-03 59.170 57
CPL -1.056 1.129 75.2 0.0 3.61e-02 0.00e+00 57.810 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: 6.208000 sec.
T50 in the 50-300 keV band: 3.392000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 9.980 -2.016 7.964
T90 7.872 -1.088 6.784
T50 3.636 1.320 4.956
Peak 1.000 4.404 5.404
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
56.8311 -29.3418 0.0311 1.1 137.1 0.2539 6.2 TRIG_00868312
------------------------------------------
Foreground time interval of the image:
-2.016 7.964 (delta_t = 9.980 [sec])
Background time interval of the image:
-239.944 -2.016 (delta_t = 237.928 [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 -2.016 sec. to 7.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.968432 ( -0.460551 0.425222 )
Norm@50keV : 1.69939E-03 ( -0.00041911 0.000416218 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.54 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 57 degrees of freedom
# Null hypothesis probability = 3.834283e-01
Photon flux (15-150 keV) in 9.98 sec: 0.195367 ( -0.0484544 0.0486883 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85495e-07 ( -4.93234e-08 5.03152e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.016 sec. to 7.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.492574 ( -2.51222 -0.492573 )
Epeak [keV] : 179.484 ( -179.483 -179.483 )
Norm@50keV : 2.77826E-03 ( -0.00145587 0.0232801 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.30 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 56 degrees of freedom
# Null hypothesis probability = 3.560949e-01
Photon flux (15-150 keV) in 9.98 sec: 0.191156 ( -0.051435 0.050681 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80304e-07 ( -5.33521e-08 5.3385e-08 ) ergs/cm2
Band function
Time interval is from -2.016 sec. to 7.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.68590 ( 0.491852 2.88728 )
beta : -1.03719 ( 1.55115 1.55115 )
Epeak [keV] : 27.8411 ( -142.218 817.788 )
Norm@50keV : 7.46730 ( -7.47626 68760.9 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.02 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 55 degrees of freedom
# Null hypothesis probability = 3.309023e-01
Photon flux (15-150 keV) in 9.98 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] : 22.6634 (-6.09582 10.0473)
R^2/D10^2 : 6.40785E-03 (-0.00428603 0.0107592)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.96 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.354839e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.995e-09 3.544e-09
25- 50 3.225e-08 1.746e-08
50-150 1.238e-07 7.371e-08
15-150 1.620e-07 7.674e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-77.6334 -200)
Norm : 0.784306 (-0.200607 0.200607)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.26 using 59 PHA bins.
# Reduced chi-squared = 1.127 for 57 degrees of freedom
# Null hypothesis probability = 2.372995e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.949e-08 1.178e-08
25- 50 3.749e-08 2.239e-08
50-150 8.222e-08 4.930e-08
15-150 1.392e-07 8.583e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.80789 (-5.82244 -5.82244)
R1^2/D10^2 : 0.228257 (-0.227729 -0.227729)
kT2 [keV] : 27.9346 (-27.9376 -27.9376)
R2^2/D10^2 : 3.09043E-03 (-0.00309056 0.00805775)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.54 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.469010e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.366e-08 8.268e-09
25- 50 3.254e-08 1.729e-08
50-150 1.335e-07 7.929e-08
15-150 1.797e-07 9.890e-08
Peak spectrum fit
Power-law model
Time interval is from 4.404 sec. to 5.404 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19243 ( -0.634452 0.64501 )
Norm@50keV : 3.54025E-03 ( -0.00135226 0.0013449 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.17 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 57 degrees of freedom
# Null hypothesis probability = 3.962002e-01
Photon flux (15-150 keV) in 1 sec: 0.415119 ( -0.157753 0.158048 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.59934e-08 ( -1.51822e-08 1.57939e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.404 sec. to 5.404 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.05575 ( 1.1039 3.36244 )
Epeak [keV] : 75.1862 ( )
Norm@50keV : 3.61341E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.81 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 56 degrees of freedom
# Null hypothesis probability = 4.083912e-01
Photon flux (15-150 keV) in 1 sec: 0.379252 ( -0.172323 0.168941 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.27647e-08 ( -1.39981e-08 1.64116e-08 ) ergs/cm2
Band function
Time interval is from 4.404 sec. to 5.404 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.05731 ( -1.31664 0.174743 )
beta : -10.00000 ( 10 6.46715e-10 )
Epeak [keV] : 75.1757 ( -24.9692 -75.1757 )
Norm@50keV : 3.69665E-02 ( -0.0135027 1.67973 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.81 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 55 degrees of freedom
# Null hypothesis probability = 3.719570e-01
Photon flux (15-150 keV) in 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] : 18.8531 (-5.8461 9.48866)
R^2/D10^2 : 2.53130E-02 (-0.0253147 0.0583261)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.70 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 57 degrees of freedom
# Null hypothesis probability = 4.493647e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.773e-09 1.144e-09
25- 50 8.483e-09 5.400e-09
50-150 2.213e-08 1.502e-08
15-150 3.238e-08 2.068e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 1.68077 (-0.646065 0.646859)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.79 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 57 degrees of freedom
# Null hypothesis probability = 3.747402e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.185e-09 2.831e-09
25- 50 8.051e-09 5.340e-09
50-150 1.766e-08 1.142e-08
15-150 2.989e-08 1.968e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.40614 (-2.40481 24.3064)
R1^2/D10^2 : 28.3513 (-28.4541 -28.4541)
kT2 [keV] : 19.7868 (-6.28028 -19.7859)
R2^2/D10^2 : 2.09504E-02 (-0.0209543 0.0504853)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.06 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 55 degrees of freedom
# Null hypothesis probability = 3.983560e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.760e-09 1.330e-09
25- 50 7.927e-09 5.040e-09
50-150 2.276e-08 1.520e-08
15-150 3.345e-08 2.166e-08
Plot creation:
Tue Oct 23 21:16:22 EDT 2018