batgrbproduct analysis for trigger=865179
batgrbproduct Analysis for Trigger=865179
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 4 19:48:21 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger865179/GCN5_download_cron
======================================================================
Trigger: 00865179 Segment: 000
BAT Trigger Time: 560236284.928 [s; MET]
Trigger Stop: 560236289.024 [s; MET]
UTC: 2018-10-03T05:11:03.236400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 52.5688373282527 Dec: -34.0233528334788 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.68
Image Trigger?: NO
Rate S/N Ratio: 8.24621125123532 [ if not an image trigger ]
Image S/N Ratio: 7.68
Flight Position: [ source = BAT ]
RA: 52.5688373282527 Dec: -34.0233528334788 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 52.4808906271844 Dec: -33.9905108658735 [deg; J2000]
{ 03h 29m 55.4s , -33d 59' 25.8" }
+/- 1.74818767949187 [arcmin] (estimated 90% radius based on SNR)
+/- 0.889116585741901 [arcmin] (formal 1-sigma fit error)
SNR: 13.6950624010427
Angular difference between Flight and Ground position is 4.797659 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 21.4919998645782 +/- 4.80344410287127
Measured from: -8.57999980449677
to: 12.9120000600815 [s; relative to TRIGTIME]
T50: 8.96399998664856 +/- 3.82733586351213
Measured from: -0.6839998960495
to: 8.28000009059906 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.86400008201599
to: 2.86400008201599 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.1959999799728
to: 18.0080000162125 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.232227 0.369282 0.204136 -0.000991
0.032871 0.035224 0.031990 0.029933 [error]
Peak 0.022101 0.030177 0.025319 -0.003208
0.006019 0.006550 0.006076 0.005540 [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 6.95e-08 1.25e-07 1.72e-07 4.92e-07 4.96e-07 8.59e-07 erg/cm2
Error 1.22e-08 1.49e-08 2.92e-08 1.68e-07 7.08e-08 1.97e-07 erg/cm2
Peak flux Power-law 2.17e-01 1.98e-01 1.24e-01 1.19e-01 5.89e-01 6.58e-01 ph/cm2/s
Error 7.54e-02 4.80e-02 4.65e-02 8.66e-02 1.43e-01 1.71e-01 ph/cm2/s
Fluence Cutoff-PL 5.68e-08 1.51e-07 1.70e-07 5.98e-08 4.25e-07 4.38e-07 erg/cm2
Error 1.46e-08 2.13e-08 3.69e-08 -------- 7.23e-08 1.01e-07 erg/cm2
Peak flux Cutoff-PL 1.94e-01 2.22e-01 1.28e-01 3.86e-02 5.73e-01 5.83e-01 ph/cm2/s
Error 8.62e-02 6.37e-02 5.47e-02 9.75e-02 1.44e-01 1.79e-01 ph/cm2/s
Fluence Band 5.62e-08 1.50e-07 1.69e-07 6.08e-08 4.24e-07 4.38e-07 erg/cm2
Error 1.44e-08 2.10e-08 -------- -------- -------- -------- erg/cm2
Peak flux Band 1.96e-01 2.19e-01 1.29e-01 4.69e-02 5.78e-01 5.93e-01 ph/cm2/s
Error -------- -------- -------- 6.82e-02 1.45e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.538 0.195 - - 1.80e-03 2.33e-04 63.130 57
CPL -0.205 1.118 56.5 14.4 1.61e-02 3.82e-02 52.400 56
The chi2 of BB fit is 55.25 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 1.672 0.433 - - 4.48e-03 1.29e-03 45.120 57
CPL 0.676 1.815 59.2 0.0 1.60e-02 1.33e-01 44.000 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: 16.832000 sec.
T50 in the 50-300 keV band: 5.760000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 29.204 -11.196 18.008
T90 21.492 -8.580 12.912
T50 8.964 -0.684 8.280
Peak 1.000 1.864 2.864
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
52.4809 -33.9905 0.0141 12.2 48.5 0.9116 13.7 TRIG_00865179
------------------------------------------
Foreground time interval of the image:
-11.196 18.008 (delta_t = 29.204 [sec])
Background time interval of the image:
-239.928 -11.196 (delta_t = 228.732 [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 -11.196 sec. to 18.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53765 ( -0.192332 0.197142 )
Norm@50keV : 1.80023E-03 ( -0.000233866 0.000231329 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.13 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 57 degrees of freedom
# Null hypothesis probability = 2.686975e-01
Photon flux (15-150 keV) in 29.2 sec: 0.227093 ( -0.0268839 0.0268854 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.95723e-07 ( -6.99869e-08 7.16428e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.196 sec. to 18.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.204607 ( -1.25312 0.982044 )
Epeak [keV] : 56.5415 ( -9.27208 19.6068 )
Norm@50keV : 1.61468E-02 ( -0.0161468 0.0602913 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.40 using 59 PHA bins.
# Reduced chi-squared = 0.9358 for 56 degrees of freedom
# Null hypothesis probability = 6.117978e-01
Photon flux (15-150 keV) in 29.2 sec: 0.213975 ( -0.027375 0.027523 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.25499e-07 ( -6.87134e-08 7.59025e-08 ) ergs/cm2
Band function
Time interval is from -11.196 sec. to 18.008 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.204885 ( -0.856598 1.41367 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 56.5298 ( -8.67016 19.6101 )
Norm@50keV : 1.61550E-02 ( -0.016155 0.0604041 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.40 using 59 PHA bins.
# Reduced chi-squared = 0.9528 for 55 degrees of freedom
# Null hypothesis probability = 5.744385e-01
Photon flux (15-150 keV) in 29.2 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.24469e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.1871 (-1.57507 1.82068)
R^2/D10^2 : 4.26386E-02 (-0.0157244 0.0242722)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.25 using 59 PHA bins.
# Reduced chi-squared = 0.9693 for 57 degrees of freedom
# Null hypothesis probability = 5.409149e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.591e-08 1.079e-08
25- 50 1.605e-07 2.495e-08
50-150 1.780e-07 4.313e-08
15-150 3.844e-07 5.767e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 169.167 (-71.9864 -168.229)
Norm : 0.941846 (-0.113181 0.0706477)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.16 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 57 degrees of freedom
# Null hypothesis probability = 3.967509e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.983e-08 3.806e-08
25- 50 1.316e-07 7.005e-08
50-150 2.724e-07 1.523e-07
15-150 4.739e-07 2.634e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.61786 (-2.84801 70.4535)
R1^2/D10^2 : 0.259376 (-0.245215 30.0613)
kT2 [keV] : 15.6881 (-3.06907 60.7773)
R2^2/D10^2 : 1.99744E-02 (-0.0199434 0.0143173)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.06 using 59 PHA bins.
# Reduced chi-squared = 0.9465 for 55 degrees of freedom
# Null hypothesis probability = 5.878107e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.852e-08 3.281e-08
25- 50 1.480e-07 7.846e-08
50-150 2.122e-07 1.260e-07
15-150 4.188e-07 2.187e-07
Peak spectrum fit
Power-law model
Time interval is from 1.864 sec. to 2.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67182 ( -0.410366 0.456126 )
Norm@50keV : 4.47969E-03 ( -0.00132138 0.0012673 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.12 using 59 PHA bins.
# Reduced chi-squared = 0.7915 for 57 degrees of freedom
# Null hypothesis probability = 8.723473e-01
Photon flux (15-150 keV) in 1 sec: 0.589215 ( -0.143264 0.143303 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.15759e-08 ( -1.24822e-08 1.31845e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.864 sec. to 2.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.675501 ( -2.18262 1.44707 )
Epeak [keV] : 59.2149 ( -59.154 -59.154 )
Norm@50keV : 1.60158E-02 ( -0.0160797 0.249249 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.00 using 59 PHA bins.
# Reduced chi-squared = 0.7858 for 56 degrees of freedom
# Null hypothesis probability = 8.774050e-01
Photon flux (15-150 keV) in 1 sec: 0.572792 ( -0.143519 0.144899 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.82018e-08 ( -1.22571e-08 1.40882e-08 ) ergs/cm2
Band function
Time interval is from 1.864 sec. to 2.864 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.677999 ( -1.13413 5.29651 )
beta : -10.0000 ( 10 1.06581e-14 )
Epeak [keV] : 59.2523 ( -26.2166 -59.2523 )
Norm@50keV : 1.59656E-02 ( -0.0159656 0.249452 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.00 using 59 PHA bins.
# Reduced chi-squared = 0.8001 for 55 degrees of freedom
# Null hypothesis probability = 8.561145e-01
Photon flux (15-150 keV) in 1 sec: 0.577836 ( 6.42216 -0.149125 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.82512e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.6283 (-3.59891 4.58905)
R^2/D10^2 : 0.124783 (-0.082952 0.281529)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.73 using 59 PHA bins.
# Reduced chi-squared = 0.8199 for 57 degrees of freedom
# Null hypothesis probability = 8.321504e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.220e-09 2.168e-09
25- 50 1.408e-08 6.824e-09
50-150 1.395e-08 8.558e-09
15-150 3.225e-08 1.622e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 121.958 (-71.2067 -121.519)
Norm : 2.53018 (-0.655782 0.94172)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.37 using 59 PHA bins.
# Reduced chi-squared = 0.7784 for 57 degrees of freedom
# Null hypothesis probability = 8.887538e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.586e-09 3.843e-09
25- 50 1.182e-08 6.910e-09
50-150 2.125e-08 1.504e-08
15-150 3.965e-08 2.484e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.44663 (-4.77943 21.995)
R1^2/D10^2 : 1.36604 (-1.26454 -1.36604)
kT2 [keV] : 18.2118 (-14.3535 23.3066)
R2^2/D10^2 : 2.67982E-02 (-0.0258593 0.0720092)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.27 using 59 PHA bins.
# Reduced chi-squared = 0.7868 for 55 degrees of freedom
# Null hypothesis probability = 8.737778e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.395e-09 3.532e-09
25- 50 1.198e-08 6.135e-09
50-150 2.019e-08 1.251e-08
15-150 3.857e-08 1.990e-08
Plot creation:
Thu Oct 4 19:56:52 EDT 2018