batgrbproduct analysis for trigger=878504
batgrbproduct Analysis for Trigger=878504
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): Sun Dec 23 10:06:41 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger878504/batgroup_hand_proc
======================================================================
Trigger: 00878504 Segment: 000
BAT Trigger Time: 567207752 [s; MET]
Trigger Stop: 567207816 [s; MET]
UTC: 2018-12-22T21:42:09.874320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 131.375298977042 Dec: -5.48787400777241 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.1
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.1
Flight Position: [ source = BAT ]
RA: 131.375298977042 Dec: -5.48787400777241 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 131.326636215374 Dec: -5.48584291516642 [deg; J2000]
{ 08h 45m 18.4s , -05d 29' 09.0" }
+/- 3.52031365145682 [arcmin] (estimated 90% radius based on SNR)
+/- 2.28964294449252 [arcmin] (formal 1-sigma fit error)
SNR: 5.03834457724872
Angular difference between Flight and Ground position is 2.908942 arcmin
Partial Coding Fraction: 0.9375 [ 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 0.214045 0.231257 0.058793 -0.021366
0.049319 0.051321 0.045609 0.041588 [error]
Peak 0.214045 0.231257 0.058793 -0.021366
0.049319 0.051321 0.045609 0.041588 [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 5.38e-08 7.55e-08 7.85e-08 1.50e-07 2.55e-07 3.57e-07 erg/cm2
Error 1.98e-08 2.27e-08 3.77e-08 1.66e-07 9.18e-08 1.87e-07 erg/cm2
Peak flux Power-law 2.74e-02 2.12e-02 1.10e-02 8.27e-03 6.34e-02 6.79e-02 ph/cm2/s
Error 1.02e-02 6.30e-03 5.13e-03 7.14e-03 1.87e-02 2.04e-02 ph/cm2/s
Fluence Cutoff-PL 4.90e-08 1.08e-07 3.57e-08 6.15e-10 1.94e-07 1.94e-07 erg/cm2
Error 2.28e-08 3.46e-08 4.78e-08 2.08e-08 7.24e-08 7.47e-08 erg/cm2
Peak flux Cutoff-PL 2.40e-02 3.06e-02 5.72e-03 5.45e-05 6.03e-02 6.03e-02 ph/cm2/s
Error 1.17e-02 9.69e-03 6.98e-03 1.51e-03 1.75e-02 1.75e-02 ph/cm2/s
Fluence Band 4.84e-08 1.08e-07 4.14e-08 9.92e-09 2.05e-07 2.08e-07 erg/cm2
Error -------- -------- -------- -------- 9.68e-08 -------- erg/cm2
Peak flux Band 2.41e-02 -------- 6.03e-03 1.45e-04 5.97e-02 6.09e-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 1.948 0.488 - - 4.33e-04 1.59e-04 71.930 57
CPL -1.673 4.244 35.1 11.0 9.29e-02 2.75e+02 66.740 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 1.948 0.488 - - 4.33e-04 1.59e-04 71.930 57
CPL -1.673 4.244 35.1 11.0 9.29e-02 2.75e+02 66.740 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 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
131.3266 -5.4858 0.0383 23.2127 -166.2816 0.5163950 5.038 TRIG_00878504
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: 1.94801 ( -0.457814 0.518924 )
Norm@50keV : 4.32629E-04 ( -0.000159896 0.000158871 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.93 using 59 PHA bins.
# Reduced chi-squared = 1.262 for 57 degrees of freedom
# Null hypothesis probability = 8.796420e-02
Photon flux (15-150 keV) in 64 sec: 6.33960E-02 ( -0.0186562 0.0186727 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5516e-07 ( -8.81869e-08 9.53747e-08 ) 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: -1.67314 ( -5.59571 2.89312 )
Epeak [keV] : 35.0942 ( -7.98455 13.9789 )
Norm@50keV : 9.29350E-02 ( -0.111788 550.819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.74 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 56 degrees of freedom
# Null hypothesis probability = 1.542000e-01
Photon flux (15-150 keV) in 64 sec: 6.03452E-02 ( -0.017276 0.0177034 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.93631e-07 ( -6.12173e-08 8.3673e-08 ) 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 : 4.38550 ( -2.80566 -1.6194 )
beta : -2.71821 ( 9.37167 19.3664 )
Epeak [keV] : 27.6381 ( -13.54 14.4317 )
Norm@50keV : 16.1556 ( -16.1743 5.06127 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.50 using 59 PHA bins.
# Reduced chi-squared = 1.209 for 55 degrees of freedom
# Null hypothesis probability = 1.376735e-01
Photon flux (15-150 keV) in 64 sec: 5.97381E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05018e-07 ( -2.0457e-07 -7.03341e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.01286 (-2.07671 2.79482)
R^2/D10^2 : 4.92851E-02 (-0.0321389 0.0848568)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.83 using 59 PHA bins.
# Reduced chi-squared = 1.172 for 57 degrees of freedom
# Null hypothesis probability = 1.751013e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.992e-08 2.931e-08
25- 50 1.063e-07 6.160e-08
50-150 4.075e-08 3.064e-08
15-150 1.970e-07 1.216e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 57.5212 (-28.7863 105.323)
Norm : 0.350204 (-0.128554 0.199583)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.74 using 59 PHA bins.
# Reduced chi-squared = 1.224 for 57 degrees of freedom
# Null hypothesis probability = 1.198117e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.593e-08 3.161e-08
25- 50 8.401e-08 4.828e-08
50-150 9.224e-08 7.437e-08
15-150 2.322e-07 1.467e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.01859 (-8.0946 -8.0946)
R1^2/D10^2 : 2.74053E-02 (-0.0278028 -0.0278028)
kT2 [keV] : 9.65062 (-9.6596 -9.6596)
R2^2/D10^2 : 2.48508E-02 (-0.0191119 -0.0191119)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.83 using 59 PHA bins.
# Reduced chi-squared = 1.215 for 55 degrees of freedom
# Null hypothesis probability = 1.316906e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.020e-08 1.757e-04
25- 50 1.062e-07 1.365e-03
50-150 4.258e-08 3.232e-02
15-150 1.990e-07 3.277e-02
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: 1.94801 ( -0.457814 0.518924 )
Norm@50keV : 4.32629E-04 ( -0.000159896 0.000158871 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.93 using 59 PHA bins.
# Reduced chi-squared = 1.262 for 57 degrees of freedom
# Null hypothesis probability = 8.796420e-02
Photon flux (15-150 keV) in 64 sec: 6.33960E-02 ( -0.0186562 0.0186727 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5516e-07 ( -8.81869e-08 9.53747e-08 ) 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: -1.67314 ( -5.59571 2.89312 )
Epeak [keV] : 35.0942 ( -7.98455 13.9789 )
Norm@50keV : 9.29350E-02 ( -0.111788 550.819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.74 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 56 degrees of freedom
# Null hypothesis probability = 1.542000e-01
Photon flux (15-150 keV) in 64 sec: 6.03452E-02 ( -0.017276 0.0177034 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.93631e-07 ( -6.12173e-08 8.3673e-08 ) 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 : 4.38550 ( -2.80566 -1.6194 )
beta : -2.71821 ( 9.37167 19.3664 )
Epeak [keV] : 27.6381 ( -13.54 14.4314 )
Norm@50keV : 16.1556 ( -16.1743 5.06127 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.50 using 59 PHA bins.
# Reduced chi-squared = 1.209 for 55 degrees of freedom
# Null hypothesis probability = 1.376735e-01
Photon flux (15-150 keV) in 64 sec: 5.97381E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05018e-07 ( -2.0457e-07 -7.03341e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.01286 (-2.07671 2.79482)
R^2/D10^2 : 4.92851E-02 (-0.0321389 0.0848568)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.83 using 59 PHA bins.
# Reduced chi-squared = 1.172 for 57 degrees of freedom
# Null hypothesis probability = 1.751013e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.992e-08 2.602e-08
25- 50 1.063e-07 5.883e-08
50-150 4.075e-08 3.101e-08
15-150 1.970e-07 1.224e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 57.5212 (-28.7863 105.323)
Norm : 0.350204 (-0.128554 0.199583)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.74 using 59 PHA bins.
# Reduced chi-squared = 1.224 for 57 degrees of freedom
# Null hypothesis probability = 1.198117e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.593e-08 3.385e-08
25- 50 8.401e-08 5.042e-08
50-150 9.224e-08 7.465e-08
15-150 2.322e-07 1.414e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.01859 (-8.0946 -8.0946)
R1^2/D10^2 : 2.74053E-02 (-0.0278028 -0.0278028)
kT2 [keV] : 9.65062 (-9.6596 -9.6596)
R2^2/D10^2 : 2.48508E-02 (-0.0191119 -0.0191119)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.83 using 59 PHA bins.
# Reduced chi-squared = 1.215 for 55 degrees of freedom
# Null hypothesis probability = 1.316906e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.020e-08 1.612e-04
25- 50 1.062e-07 1.490e-03
50-150 4.258e-08 3.076e-02
15-150 1.990e-07 3.450e-02
Plot creation:
Sun Dec 23 10:37:32 EST 2018