batgrbproduct analysis for trigger=874754
batgrbproduct Analysis for Trigger=874754
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): Wed Dec 5 17:54:14 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger874754/GCN5_download_cron
======================================================================
Trigger: 00874754 Segment: 000
BAT Trigger Time: 565648120 [s; MET]
Trigger Stop: 565648184 [s; MET]
UTC: 2018-12-04T20:28:17.971720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 188.082656362467 Dec: 16.3088812829625 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.99
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.99
Flight Position: [ source = BAT ]
RA: 188.082656362467 Dec: 16.3088812829625 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 188.154982368285 Dec: 16.3912834371135 [deg; J2000]
{ 12h 32m 37.2s , +16d 23' 28.6" }
+/- 4.38031607336729 [arcmin] (estimated 90% radius based on SNR)
+/- 3.37957037005526 [arcmin] (formal 1-sigma fit error)
SNR: 3.68707544154035
Angular difference between Flight and Ground position is 6.464044 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.347913 0.152641 0.067571 -0.062759
0.067841 0.070086 0.062418 0.057678 [error]
Peak 0.347913 0.152641 0.067571 -0.062759
0.067841 0.070086 0.062418 0.057678 [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 9.75e-08 8.62e-08 5.23e-08 4.80e-08 2.56e-07 2.84e-07 erg/cm2
Error 3.26e-08 3.60e-08 4.26e-08 8.21e-08 1.09e-07 1.54e-07 erg/cm2
Peak flux Power-law 5.04e-02 2.49e-02 7.57e-03 2.92e-03 8.46e-02 8.59e-02 ph/cm2/s
Error 1.72e-02 9.98e-03 5.96e-03 4.63e-03 2.67e-02 2.76e-02 ph/cm2/s
Fluence Cutoff-PL 1.17e-07 5.88e-08 8.61e-11 3.86e-19 1.77e-07 1.76e-07 erg/cm2
Error 3.71e-08 4.72e-08 3.04e-08 0.00e+00 7.86e-08 8.62e-08 erg/cm2
Peak flux Cutoff-PL 5.83e-02 1.96e-02 1.66e-05 4.46e-14 7.78e-02 7.79e-02 ph/cm2/s
Error 1.94e-02 1.34e-02 -------- 0.00e+00 1.74e-02 2.32e-02 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- 8.22e-02 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 2.721 0.753 - - 3.74e-04 2.29e-04 57.720 57
CPL 1.000 0.000 50.0 0.0 1.72e-03 0.00e+00 63.290 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.721 0.753 - - 3.74e-04 2.29e-04 57.720 57
CPL 1.000 0.000 50.0 0.0 1.72e-03 0.00e+00 63.290 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
188.1550 +16.3913 0.0522 35.0 -16.8 0.4950 3.7 TRIG_00874754
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.72072 ( -0.642299 0.864408 )
Norm@50keV : 3.73887E-04 ( -0.000215619 0.000241516 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.72 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 57 degrees of freedom
# Null hypothesis probability = 4.483704e-01
Photon flux (15-150 keV) in 64 sec: 8.46023E-02 ( -0.0265717 0.0267712 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56432e-07 ( -1.00556e-07 1.17169e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.72106E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.29 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 56 degrees of freedom
# Null hypothesis probability = 2.348335e-01
Photon flux (15-150 keV) in 64 sec: 7.77962E-02 7.76158E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.59554e-18 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98216 ( -13.1299 -4.98216 )
beta : -4.04942 ( 4.04942 1.54336 )
Epeak [keV] : 21.4456 ( -6.401 4.7853 )
Norm@50keV : 372.131 ( -108.496 4078.53 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.75 using 59 PHA bins.
# Reduced chi-squared = 0.9954 for 55 degrees of freedom
# Null hypothesis probability = 4.841566e-01
Photon flux (15-150 keV) in 64 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] : 5.30231 (-1.31907 1.87501)
R^2/D10^2 : 0.555023 (-0.555022 1.50792)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.12 using 59 PHA bins.
# Reduced chi-squared = 0.9845 for 57 degrees of freedom
# Null hypothesis probability = 5.081426e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.086e-07 6.502e-08
25- 50 8.178e-08 5.318e-08
50-150 4.384e-09 4.282e-09
15-150 1.948e-07 1.186e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.7995 (-10.2714 26.8861)
Norm : 0.987365 (-0.529382 1.39564)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.92 using 59 PHA bins.
# Reduced chi-squared = 0.9985 for 57 degrees of freedom
# Null hypothesis probability = 4.781722e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.012e-07 5.997e-08
25- 50 9.134e-08 5.702e-08
50-150 2.920e-08 2.642e-08
15-150 2.218e-07 1.310e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.94370 (-4.8949 1.94423)
R1^2/D10^2 : 0.701525 (-0.723351 4.80349)
kT2 [keV] : 20.3557 (-20.1659 -20.1659)
R2^2/D10^2 : 6.98709E-04 (-0.000754576 0.00621103)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.37 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 55 degrees of freedom
# Null hypothesis probability = 4.607706e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.079e-07 6.592e-08
25- 50 8.413e-08 4.778e-08
50-150 5.757e-08 3.894e-08
15-150 2.496e-07 1.324e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.72072 ( -0.642299 0.864408 )
Norm@50keV : 3.73887E-04 ( -0.000215619 0.000241516 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.72 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 57 degrees of freedom
# Null hypothesis probability = 4.483704e-01
Photon flux (15-150 keV) in 64 sec: 8.46023E-02 ( -0.0265717 0.0267712 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56432e-07 ( -1.00556e-07 1.17169e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.72106E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.29 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 56 degrees of freedom
# Null hypothesis probability = 2.348335e-01
Photon flux (15-150 keV) in 64 sec: 7.77962E-02 7.76158E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.59554e-18 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98216 ( -6.32258 -4.98216 )
beta : -4.04942 ( 4.04942 1.54336 )
Epeak [keV] : 21.4456 ( -6.401 4.7853 )
Norm@50keV : 372.131 ( -108.496 4078.53 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.75 using 59 PHA bins.
# Reduced chi-squared = 0.9954 for 55 degrees of freedom
# Null hypothesis probability = 4.841566e-01
Photon flux (15-150 keV) in 64 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] : 5.30231 (-1.31907 1.87501)
R^2/D10^2 : 0.555023 (-0.555022 1.50792)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.12 using 59 PHA bins.
# Reduced chi-squared = 0.9845 for 57 degrees of freedom
# Null hypothesis probability = 5.081426e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.086e-07 6.515e-08
25- 50 8.178e-08 5.174e-08
50-150 4.384e-09 4.016e-09
15-150 1.948e-07 1.189e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.7995 (-10.2714 26.8861)
Norm : 0.987365 (-0.529382 1.39564)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.92 using 59 PHA bins.
# Reduced chi-squared = 0.9985 for 57 degrees of freedom
# Null hypothesis probability = 4.781722e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.012e-07 5.951e-08
25- 50 9.134e-08 5.800e-08
50-150 2.920e-08 2.657e-08
15-150 2.218e-07 1.422e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.94370 (-4.8949 1.94423)
R1^2/D10^2 : 0.701525 (-0.723351 4.80349)
kT2 [keV] : 20.3557 (-20.1659 -20.1659)
R2^2/D10^2 : 6.98709E-04 (-0.000754576 0.00654704)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.37 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 55 degrees of freedom
# Null hypothesis probability = 4.607706e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.079e-07 6.643e-08
25- 50 8.413e-08 5.312e-08
50-150 5.757e-08 5.165e-08
15-150 2.496e-07 1.362e-07
Plot creation:
Wed Dec 5 17:57:29 EST 2018