batgrbproduct analysis for trigger=866434
batgrbproduct Analysis for Trigger=866434
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): Thu Oct 11 08:03:21 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger866434/GCN5_download_cron
======================================================================
Trigger: 00866434 Segment: 000
BAT Trigger Time: 560843773.44 [s; MET]
Trigger Stop: 560843774.464 [s; MET]
UTC: 2018-10-10T05:55:51.710680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 52.5574971856556 Dec: -23.0353985197853 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.39
Image Trigger?: NO
Rate S/N Ratio: 12.6491106406735 [ if not an image trigger ]
Image S/N Ratio: 7.39
Flight Position: [ source = BAT ]
RA: 52.5574971856556 Dec: -23.0353985197853 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 52.5736380000352 Dec: -23.0229808067244 [deg; J2000]
{ 03h 30m 17.7s , -23d 01' 22.7" }
+/- 1.43906004947857 [arcmin] (estimated 90% radius based on SNR)
+/- 0.458471072893537 [arcmin] (formal 1-sigma fit error)
SNR: 18.0838691598596
Angular difference between Flight and Ground position is 1.161671 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 16.3999998569489 +/- 2.19279277929316
Measured from: -3.21199989318848
to: 13.1879999637604 [s; relative to TRIGTIME]
T50: 8.03199994564056 +/- 0.964895872208353
Measured from: 0.248000025749207
to: 8.27999997138977 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.43199992179871
to: 8.43199992179871 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.0440000295639
to: 15.2119998931885 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.332633 0.395701 0.320671 0.066870
0.029997 0.031442 0.027637 0.023447 [error]
Peak 0.034972 0.063438 0.065318 0.017345
0.007515 0.008179 0.007567 0.006408 [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 9.49e-08 1.73e-07 2.42e-07 7.07e-07 6.93e-07 1.22e-06 erg/cm2
Error 1.33e-08 1.48e-08 2.73e-08 1.71e-07 6.56e-08 1.92e-07 erg/cm2
Peak flux Power-law 3.69e-01 4.50e-01 3.98e-01 6.06e-01 1.43e+00 1.82e+00 ph/cm2/s
Error 9.23e-02 6.86e-02 6.14e-02 2.00e-01 1.91e-01 2.60e-01 ph/cm2/s
Fluence Cutoff-PL 9.37e-08 1.75e-07 2.43e-07 6.00e-07 6.88e-07 1.10e-06 erg/cm2
Error 1.47e-08 1.73e-08 2.84e-08 2.82e-07 7.17e-08 3.20e-07 erg/cm2
Peak flux Cutoff-PL 3.45e-01 4.63e-01 4.11e-01 4.14e-01 1.41e+00 1.63e+00 ph/cm2/s
Error 1.10e-01 7.85e-02 7.12e-02 3.24e-01 1.99e-01 3.83e-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 1.516 0.147 - - 3.80e-03 3.26e-04 56.200 57
CPL 1.421 0.393 297.0 0.0 4.26e-03 0.00e+00 56.100 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.178 0.230 - - 1.22e-02 1.60e-03 61.240 57
CPL 0.847 0.796 182.7 0.0 1.77e-02 2.33e-02 60.840 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: 10.112000 sec.
T50 in the 50-300 keV band: 8.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 19.256 -4.044 15.212
T90 16.400 -3.212 13.188
T50 8.032 0.248 8.280
Peak 1.000 7.432 8.432
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
52.5736 -23.0230 0.0106 26.5 -152.8 1.0444 18.1 TRIG_00866434
------------------------------------------
Foreground time interval of the image:
-4.044 13.361 (delta_t = 17.405 [sec])
Background time interval of the image:
-239.440 -140.120 (delta_t = 99.320 [sec])
-139.440 -4.044 (delta_t = 135.396 [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 -4.044 sec. to 15.212 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51614 ( -0.146593 0.147587 )
Norm@50keV : 3.80305E-03 ( -0.000327133 0.000325096 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.20 using 59 PHA bins.
# Reduced chi-squared = 0.9859 for 57 degrees of freedom
# Null hypothesis probability = 5.051066e-01
Photon flux (15-150 keV) in 19.26 sec: 0.476859 ( -0.040037 0.040075 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.9306e-07 ( -6.53137e-08 6.59183e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.044 sec. to 15.212 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42100 ( -0.555607 0.231193 )
Epeak [keV] : 297.026 ( -297.028 -297.028 )
Norm@50keV : 4.26174E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.10 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 56 degrees of freedom
# Null hypothesis probability = 4.711902e-01
Photon flux (15-150 keV) in 19.26 sec: 0.474880 ( -0.041318 0.041157 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.87715e-07 ( -7.23849e-08 7.09442e-08 ) ergs/cm2
Band function
Time interval is from -4.044 sec. to 15.212 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94106 ( -4.94106 -4.94106 )
beta : -1.58989 ( -0.192095 0.164327 )
Epeak [keV] : 23.3551 ( -7.38643 4.44858 )
Norm@50keV : 567.064 ( -46.5659 1.79345e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.97 using 59 PHA bins.
# Reduced chi-squared = 0.9813 for 55 degrees of freedom
# Null hypothesis probability = 5.139037e-01
Photon flux (15-150 keV) in 19.26 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] : 14.3371 (-1.6798 1.94787)
R^2/D10^2 : 6.16862E-02 (-0.0221958 0.0342709)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 98.54 using 59 PHA bins.
# Reduced chi-squared = 1.729 for 57 degrees of freedom
# Null hypothesis probability = 5.285827e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.146e-08 7.723e-09
25- 50 1.959e-07 2.238e-08
50-150 2.683e-07 4.776e-08
15-150 5.157e-07 5.749e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-59.2982 -200)
Norm : 1.94651 (-0.160377 0.160377)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.59 using 59 PHA bins.
# Reduced chi-squared = 0.9928 for 57 degrees of freedom
# Null hypothesis probability = 4.903645e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.337e-08 1.055e-08
25- 50 1.796e-07 3.504e-08
50-150 3.939e-07 1.163e-07
15-150 6.669e-07 2.084e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.91482 (-1.41353 1.6442)
R1^2/D10^2 : 0.565092 (-0.289662 0.705933)
kT2 [keV] : 29.0698 (-6.66303 13.4998)
R2^2/D10^2 : 4.26586E-03 (-0.00297748 0.00635577)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.70 using 59 PHA bins.
# Reduced chi-squared = 0.9764 for 55 degrees of freedom
# Null hypothesis probability = 5.244055e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.361e-08 2.823e-08
25- 50 1.778e-07 4.495e-08
50-150 4.246e-07 2.185e-07
15-150 6.959e-07 2.442e-07
Peak spectrum fit
Power-law model
Time interval is from 7.432 sec. to 8.432 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17782 ( -0.232746 0.227909 )
Norm@50keV : 1.22039E-02 ( -0.00160277 0.00160238 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.24 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 57 degrees of freedom
# Null hypothesis probability = 3.265830e-01
Photon flux (15-150 keV) in 1 sec: 1.42819 ( -0.191044 0.191337 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24604e-07 ( -1.84039e-08 1.86291e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.432 sec. to 8.432 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.846562 ( -1.06228 0.529213 )
Epeak [keV] : 182.663 ( -182.666 -182.666 )
Norm@50keV : 1.76950E-02 ( -0.00869113 0.0378219 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.84 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 56 degrees of freedom
# Null hypothesis probability = 3.060039e-01
Photon flux (15-150 keV) in 1 sec: 1.40857 ( -0.19933 0.19823 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21597e-07 ( -2.0555e-08 2.0254e-08 ) ergs/cm2
Band function
Time interval is from 7.432 sec. to 8.432 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.94364 ( -3.94367 -3.94367 )
beta : -1.27692 ( -0.323566 0.274701 )
Epeak [keV] : 28.9722 ( -28.9683 90.9434 )
Norm@50keV : 79.1014 ( -79.1766 710514 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.22 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 55 degrees of freedom
# Null hypothesis probability = 2.924869e-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] : 18.4540 (-2.96861 3.77988)
R^2/D10^2 : 8.57160E-02 (-0.0391418 0.0677426)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.09 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 57 degrees of freedom
# Null hypothesis probability = 1.141814e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.797e-09 1.564e-09
25- 50 2.730e-08 5.965e-09
50-150 6.791e-08 1.855e-08
15-150 1.010e-07 1.943e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-42.3869 -200)
Norm : 5.84847 (-0.784443 0.784443)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.77 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 57 degrees of freedom
# Null hypothesis probability = 1.554783e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.456e-08 8.360e-09
25- 50 2.801e-08 1.550e-08
50-150 6.144e-08 3.415e-08
15-150 1.040e-07 5.900e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.71758 (-2.79826 7.21609)
R1^2/D10^2 : 1.23033 (-1.01654 7.67738)
kT2 [keV] : 26.7238 (-7.14701 -26.7243)
R2^2/D10^2 : 2.20352E-02 (-0.0212022 0.0427743)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.78 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 55 degrees of freedom
# Null hypothesis probability = 2.757415e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.116e-08 6.365e-09
25- 50 2.622e-08 1.396e-08
50-150 8.234e-08 4.635e-08
15-150 1.197e-07 5.796e-08
Plot creation:
Thu Oct 11 08:08:35 EDT 2018