batgrbproduct analysis for trigger=895257
batgrbproduct Analysis for Trigger=895257
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 Mar 28 17:23:56 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger895257/GCN5_download_cron
======================================================================
Trigger: 00895257 Segment: 000
BAT Trigger Time: 575370040 [s; MET]
Trigger Stop: 575370104 [s; MET]
UTC: 2019-03-27T09:00:17.361140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 314.697762888975 Dec: 41.822158448217 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 9.58
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.58
Flight Position: [ source = BAT ]
RA: 314.697762888975 Dec: 41.822158448217 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 314.651193656833 Dec: 41.8338337935744 [deg; J2000]
{ 20h 58m 36.3s , +41d 50' 01.8" }
+/- 2.660766960479 [arcmin] (estimated 90% radius based on SNR)
+/- 1.39179078820163 [arcmin] (formal 1-sigma fit error)
SNR: 7.51563625270616
Angular difference between Flight and Ground position is 2.196752 arcmin
Partial Coding Fraction: 0.953125 [ including projection effects ]
Duration
T90: 64 +/- 0.00894415675604677
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/- 0.004
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 0.412263 0.286025 0.059766 0.057820
0.056979 0.058703 0.051470 0.047733 [error]
Peak 0.412263 0.286025 0.059766 0.057820
0.056979 0.058703 0.051470 0.047733 [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 1.18e-07 1.13e-07 7.61e-08 7.99e-08 3.39e-07 3.87e-07 erg/cm2
Error 2.59e-08 2.90e-08 3.92e-08 7.76e-08 9.41e-08 1.41e-07 erg/cm2
Peak flux Power-law 6.06e-02 3.26e-02 1.10e-02 4.77e-03 1.07e-01 1.09e-01 ph/cm2/s
Error 1.37e-02 8.01e-03 5.46e-03 4.32e-03 2.13e-02 2.23e-02 ph/cm2/s
Fluence Cutoff-PL 1.21e-07 1.24e-07 2.61e-08 5.47e-10 2.72e-07 2.72e-07 erg/cm2
Error 2.82e-08 3.88e-08 5.23e-08 7.35e-08 1.02e-07 1.44e-07 erg/cm2
Peak flux Cutoff-PL 6.14e-02 3.66e-02 4.20e-03 4.80e-05 1.02e-01 1.02e-01 ph/cm2/s
Error 1.47e-02 1.07e-02 7.60e-03 4.24e-03 2.04e-02 2.04e-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 2.574 0.469 - - 5.19e-04 1.99e-04 50.860 57
CPL 0.773 3.095 19.3 0.0 1.03e-02 0.00e+00 49.680 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.574 0.469 - - 5.19e-04 1.99e-04 50.860 57
CPL 0.773 3.095 19.3 0.0 1.03e-02 0.00e+00 49.680 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
314.6512 +41.8338 0.0255 20.0 17.6 0.8708 7.5 TRIG_00895257
------------------------------------------
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: 2.57378 ( -0.427262 0.510824 )
Norm@50keV : 5.19090E-04 ( -0.000194842 0.000202923 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.86 using 59 PHA bins.
# Reduced chi-squared = 0.8923 for 57 degrees of freedom
# Null hypothesis probability = 7.033960e-01
Photon flux (15-150 keV) in 64 sec: 0.106762 ( -0.021302 0.0213757 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.3924e-07 ( -8.93555e-08 9.88173e-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: 0.772930 ( -4.9383 1.25105 )
Epeak [keV] : 19.2656 ( )
Norm@50keV : 1.02755E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.68 using 59 PHA bins.
# Reduced chi-squared = 0.8872 for 56 degrees of freedom
# Null hypothesis probability = 7.113935e-01
Photon flux (15-150 keV) in 64 sec: 0.102257 ( -0.0201498 0.020623 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72115e-07 ( -6.51085e-08 1.39003e-07 ) 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 : 4.91736 ( -4.91736 -4.91736 )
beta : -3.03766 ( -1.76562 0.669584 )
Epeak [keV] : 20.3167 ( -20.3167 4.28955 )
Norm@50keV : 534.914 ( -102.516 2.10631e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.72 using 59 PHA bins.
# Reduced chi-squared = 0.8858 for 55 degrees of freedom
# Null hypothesis probability = 7.119191e-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] : 6.09802 (-1.16884 1.36779)
R^2/D10^2 : 0.372043 (-0.214213 0.557221)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.25 using 59 PHA bins.
# Reduced chi-squared = 0.8816 for 57 degrees of freedom
# Null hypothesis probability = 7.242919e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.204e-07 5.148e-08
25- 50 1.243e-07 5.466e-08
50-150 1.216e-08 8.896e-09
15-150 2.569e-07 9.766e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.0310 (-8.71609 16.5853)
Norm : 1.05647 (-0.394047 0.707986)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.93 using 59 PHA bins.
# Reduced chi-squared = 0.8759 for 57 degrees of freedom
# Null hypothesis probability = 7.353087e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.206e-07 3.264e-08
25- 50 1.205e-07 4.790e-08
50-150 4.831e-08 3.546e-08
15-150 2.894e-07 1.032e-07
Double BB
R1^2/D10^2 : 7.83976E-06 (-3.91988e-06 0.000270347)
kT2 [keV] : 5.81116 (-0.806987 1.31513)
R2^2/D10^2 : 0.444219 (-0.258321 0.780198)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.47 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.55 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.45 using 59 PHA bins.
# Reduced chi-squared = 0.8995 for 55 degrees of freedom
# Reduced chi-squared = 0.8646 for 55 degrees of freedom
# Reduced chi-squared = 0.8628 for 55 degrees of freedom
# Null hypothesis probability = 6.849913e-01
# Null hypothesis probability = 7.519096e-01
# Null hypothesis probability = 7.551851e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.222e-07 7.446e-08
25- 50 1.234e-07 7.258e-08
50-150 2.678e-08 1.768e-08
15-150 2.723e-07 1.646e-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: 2.57378 ( -0.427262 0.510824 )
Norm@50keV : 5.19090E-04 ( -0.000194842 0.000202923 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.86 using 59 PHA bins.
# Reduced chi-squared = 0.8923 for 57 degrees of freedom
# Null hypothesis probability = 7.033960e-01
Photon flux (15-150 keV) in 64 sec: 0.106762 ( -0.021302 0.0213757 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.3924e-07 ( -8.93555e-08 9.88173e-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: 0.772930 ( -4.9383 1.25105 )
Epeak [keV] : 19.2656 ( )
Norm@50keV : 1.02755E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.68 using 59 PHA bins.
# Reduced chi-squared = 0.8872 for 56 degrees of freedom
# Null hypothesis probability = 7.113935e-01
Photon flux (15-150 keV) in 64 sec: 0.102257 ( -0.0201498 0.020623 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72115e-07 ( -6.51085e-08 1.37512e-07 ) 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 : 4.91736 ( -4.91736 -4.91736 )
beta : -3.03766 ( -1.76562 0.669584 )
Epeak [keV] : 20.3167 ( -20.3167 4.28955 )
Norm@50keV : 534.914 ( -102.516 2.10631e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.72 using 59 PHA bins.
# Reduced chi-squared = 0.8858 for 55 degrees of freedom
# Null hypothesis probability = 7.119191e-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] : 6.09802 (-1.16884 1.36779)
R^2/D10^2 : 0.372043 (-0.214213 0.557221)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.25 using 59 PHA bins.
# Reduced chi-squared = 0.8816 for 57 degrees of freedom
# Null hypothesis probability = 7.242919e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.204e-07 4.599e-08
25- 50 1.243e-07 5.395e-08
50-150 1.216e-08 9.098e-09
15-150 2.569e-07 9.466e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.0310 (-8.71609 16.5853)
Norm : 1.05647 (-0.394047 0.707986)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.93 using 59 PHA bins.
# Reduced chi-squared = 0.8759 for 57 degrees of freedom
# Null hypothesis probability = 7.353087e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.206e-07 3.526e-08
25- 50 1.205e-07 4.382e-08
50-150 4.831e-08 3.516e-08
15-150 2.894e-07 1.051e-07
Double BB
R1^2/D10^2 : 7.83976E-06 (-3.91988e-06 0.000270347)
kT2 [keV] : 5.81116 (-0.806987 1.31513)
R2^2/D10^2 : 0.444219 (-0.258321 0.780198)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.47 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.55 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.45 using 59 PHA bins.
# Reduced chi-squared = 0.8995 for 55 degrees of freedom
# Reduced chi-squared = 0.8646 for 55 degrees of freedom
# Reduced chi-squared = 0.8628 for 55 degrees of freedom
# Null hypothesis probability = 6.849913e-01
# Null hypothesis probability = 7.519096e-01
# Null hypothesis probability = 7.551851e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.222e-07 8.442e-08
25- 50 1.234e-07 7.856e-08
50-150 2.678e-08 1.606e-08
15-150 2.723e-07 1.495e-07
Plot creation:
Thu Mar 28 17:27:59 EDT 2019