batgrbproduct analysis for trigger=882561
batgrbproduct Analysis for Trigger=882561
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 Jan 9 02:24:20 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger882561/GCN5_download_cron
======================================================================
Trigger: 00882561 Segment: 000
BAT Trigger Time: 568603336 [s; MET]
Trigger Stop: 568603400 [s; MET]
UTC: 2019-01-08T01:21:53.786980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 247.80962762682 Dec: -47.7246694926881 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.19
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.19
Flight Position: [ source = BAT ]
RA: 247.80962762682 Dec: -47.7246694926881 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 247.865430726901 Dec: -47.7050041511978 [deg; J2000]
{ 16h 31m 27.7s , -47d 42' 18.0" }
+/- 3.38665424102688 [arcmin] (estimated 90% radius based on SNR)
+/- 2.18712192261321 [arcmin] (formal 1-sigma fit error)
SNR: 5.32479467521234
Angular difference between Flight and Ground position is 2.543030 arcmin
Partial Coding Fraction: 0.8203125 [ 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 0.280821 0.343065 -0.024687 0.005619
0.064335 0.058369 0.050312 0.046375 [error]
Peak 0.280821 0.343065 -0.024687 0.005619
0.064335 0.058369 0.050312 0.046375 [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 9.54e-08 9.65e-08 6.86e-08 7.76e-08 2.91e-07 3.39e-07 erg/cm2
Error 2.84e-08 2.83e-08 3.72e-08 9.25e-08 9.29e-08 1.40e-07 erg/cm2
Peak flux Power-law 4.91e-02 2.77e-02 9.84e-03 4.59e-03 8.91e-02 9.12e-02 ph/cm2/s
Error 1.49e-02 7.88e-03 5.17e-03 5.18e-03 2.29e-02 2.37e-02 ph/cm2/s
Fluence Cutoff-PL 8.65e-08 1.34e-07 2.39e-08 1.28e-10 2.45e-07 2.45e-07 erg/cm2
Error 3.31e-08 4.14e-08 3.39e-08 4.74e-09 6.79e-08 6.79e-08 erg/cm2
Peak flux Cutoff-PL 4.27e-02 3.91e-02 3.96e-03 1.15e-05 8.58e-02 8.58e-02 ph/cm2/s
Error 1.73e-02 1.16e-02 5.17e-03 3.82e-04 2.19e-02 2.19e-02 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 2.490 0.513 - - 4.56e-04 1.86e-04 64.130 57
CPL -1.595 4.546 28.7 5.0 2.33e-01 2.39e+03 57.910 56
The chi2 of BB fit is 57.87 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 2.490 0.513 - - 4.56e-04 1.86e-04 64.130 57
CPL -1.595 4.546 28.7 5.0 2.33e-01 2.39e+03 57.910 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
247.8654 -47.7050 0.0361 24.2 -36.1 0.6492 5.3 TRIG_00882561
------------------------------------------
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: 2.49050 ( -0.469573 0.55695 )
Norm@50keV : 4.56202E-04 ( -0.000183332 0.000189222 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.13 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 57 degrees of freedom
# Null hypothesis probability = 2.408544e-01
Photon flux (15-150 keV) in 64 sec: 8.90921E-02 ( -0.022845 0.0228904 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.90965e-07 ( -8.89658e-08 9.68998e-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: -1.59505 ( -6.24494 2.84712 )
Epeak [keV] : 28.6755 ( -3.38534 6.66497 )
Norm@50keV : 0.233366 ( -0.277698 4778.95 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.91 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 56 degrees of freedom
# Null hypothesis probability = 4.047162e-01
Photon flux (15-150 keV) in 64 sec: 8.58186E-02 ( -0.0217841 0.0219654 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44936e-07 ( -6.45517e-08 7.11686e-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 : 1.98047 ( -2.32984 -1.60117 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 29.0602 ( -7.60553 6.27903 )
Norm@50keV : 0.413017 ( -0.412622 45.8709 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.86 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 55 degrees of freedom
# Null hypothesis probability = 3.700615e-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] : 7.37157 (-1.4401 1.73077)
R^2/D10^2 : 0.149715 (-0.0884969 0.219561)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.87 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 57 degrees of freedom
# Null hypothesis probability = 4.428076e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.798e-08 4.227e-08
25- 50 1.329e-07 6.186e-08
50-150 2.646e-08 1.992e-08
15-150 2.474e-07 1.320e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 28.8544 (-10.887 21.7891)
Norm : 0.766733 (-0.30039 0.509156)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.88 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 57 degrees of freedom
# Null hypothesis probability = 3.380799e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.785e-08 3.806e-08
25- 50 1.094e-07 4.836e-08
50-150 5.689e-08 4.387e-08
15-150 2.641e-07 1.251e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.03976E-04 (-0.000103976 -0.000103976)
R1^2/D10^2 : 0.129183 (-0.129183 -0.129183)
kT2 [keV] : 7.37120 (-1.43973 1.73114)
R2^2/D10^2 : 0.149745 (-0.0885281 0.21953)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.91 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.87 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 55 degrees of freedom
# Reduced chi-squared = 1.052 for 55 degrees of freedom
# Null hypothesis probability = 3.683344e-01
# Null hypothesis probability = 3.696652e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.859e-08 4.669e-04
25- 50 1.321e-07 3.846e-03
50-150 2.754e-08 8.598e-02
15-150 2.482e-07 9.603e-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: 2.49050 ( -0.469573 0.55695 )
Norm@50keV : 4.56202E-04 ( -0.000183332 0.000189222 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.13 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 57 degrees of freedom
# Null hypothesis probability = 2.408544e-01
Photon flux (15-150 keV) in 64 sec: 8.90921E-02 ( -0.022845 0.0228904 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.90965e-07 ( -8.89658e-08 9.68998e-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: -1.59505 ( -6.24494 2.84712 )
Epeak [keV] : 28.6755 ( -3.38534 6.66497 )
Norm@50keV : 0.233366 ( -0.277698 4778.95 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.91 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 56 degrees of freedom
# Null hypothesis probability = 4.047162e-01
Photon flux (15-150 keV) in 64 sec: 8.58186E-02 ( -0.0217841 0.0219654 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44936e-07 ( -6.45517e-08 7.11686e-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 : 1.98047 ( -2.32984 -1.60117 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 29.0602 ( -7.6084 6.27877 )
Norm@50keV : 0.413017 ( -0.412622 45.8709 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.86 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 55 degrees of freedom
# Null hypothesis probability = 3.700615e-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] : 7.37157 (-1.4401 1.73077)
R^2/D10^2 : 0.149715 (-0.0884969 0.219561)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.87 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 57 degrees of freedom
# Null hypothesis probability = 4.428076e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.798e-08 4.612e-08
25- 50 1.329e-07 7.692e-08
50-150 2.646e-08 2.038e-08
15-150 2.474e-07 1.284e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 28.8544 (-10.887 21.7891)
Norm : 0.766733 (-0.30039 0.509156)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.88 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 57 degrees of freedom
# Null hypothesis probability = 3.380799e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.785e-08 3.556e-08
25- 50 1.094e-07 5.003e-08
50-150 5.689e-08 4.458e-08
15-150 2.641e-07 1.215e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.03976E-04 (-0.000103976 -0.000103976)
R1^2/D10^2 : 0.129183 (-0.129183 -0.129183)
kT2 [keV] : 7.37120 (-1.43973 1.73114)
R2^2/D10^2 : 0.149745 (-0.0885281 0.21953)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.91 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.87 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 55 degrees of freedom
# Reduced chi-squared = 1.052 for 55 degrees of freedom
# Null hypothesis probability = 3.683344e-01
# Null hypothesis probability = 3.696652e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.859e-08 4.736e-04
25- 50 1.321e-07 3.571e-03
50-150 2.754e-08 8.451e-02
15-150 2.482e-07 1.062e-01
Plot creation:
Wed Jan 9 02:28:46 EST 2019