batgrbproduct analysis for trigger=931384
batgrbproduct Analysis for Trigger=931384
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): Sat Oct 26 07:07:17 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger931384/GCN5_download_cron
======================================================================
Trigger: 00931384 Segment: 000
BAT Trigger Time: 593664430.848 [s; MET]
Trigger Stop: 593664430.88 [s; MET]
UTC: 2019-10-25T02:46:47.042040 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 320.755210305284 Dec: -48.3297080251716 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.63
Image Trigger?: NO
Rate S/N Ratio: 6.32455532033676 [ if not an image trigger ]
Image S/N Ratio: 6.63
Flight Position: [ source = BAT ]
RA: 320.755210305284 Dec: -48.3297080251716 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 320.710829185498 Dec: -48.3491863689264 [deg; J2000]
{ 21h 22m 50.6s , -48d 20' 57.1" }
+/- 4.45006572519532 [arcmin] (estimated 90% radius based on SNR)
+/- 2.77136322988655 [arcmin] (formal 1-sigma fit error)
SNR: 3.60479547736384
Angular difference between Flight and Ground position is 2.121071 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 0.031999945640564 +/-
Measured from: 0
to: 0.031999945640564 [s; relative to TRIGTIME]
T50: 0.031999945640564 +/-
Measured from: 0
to: 0.031999945640564 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.031999945640564 second)
Measured from: 5.96046447753906e-08
to: 0.0320000052452087 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.031999945640564 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.002328 0.007625 0.007399 -0.001038
0.001450 0.001863 0.001971 0.001421 [error]
Peak -0.002328 0.007625 0.007399 -0.001038
0.001450 0.001863 0.001971 0.001421 [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 2.19e-12 2.22e-11 2.04e-10 1.23e-08 8.35e-10 1.25e-08 erg/cm2
Error 1.08e-10 9.36e-11 3.19e-10 1.68e-08 1.10e-09 1.70e-08 erg/cm2
Peak flux Power-law 2.08e-03 1.11e-02 5.07e-02 9.52e-01 1.57e-01 1.02e+00 ph/cm2/s
Error 1.14e-01 5.28e-02 8.25e-02 1.27e+00 2.26e-01 1.32e+00 ph/cm2/s
Fluence Cutoff-PL 2.56e-14 1.03e-11 6.51e-10 2.30e-09 2.13e-09 2.96e-09 erg/cm2
Error 2.72e-11 8.12e-11 8.21e-10 -------- 2.21e-09 1.66e-08 erg/cm2
Peak flux Cutoff-PL 5.35e-05 4.72e-03 1.50e-01 3.20e-01 3.92e-01 7.37e-01 ph/cm2/s
Error 3.13e-02 3.17e-02 2.00e-01 -------- 4.17e-01 4.95e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 -1.210 0.000 - - 6.14e-04 1.58e-03 76.370 57
CPL 1.000 0.000 50.0 0.0 0.00e+00 0.00e+00 77.650 56
The chi2 of BB fit is 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 -1.210 0.000 - - 6.14e-04 1.58e-03 76.370 57
CPL 1.000 0.000 50.0 0.0 0.00e+00 0.00e+00 77.650 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 0.032 0.000 0.032
T90 0.032 0.000 0.032
T50 0.032 0.000 0.032
Peak 0.032 0.000 0.032
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
320.7108 -48.3492 0.0533 37.2 -168.5 0.0127 3.6 TRIG_00931384
------------------------------------------
Foreground time interval of the image:
0.000 0.032 (delta_t = 0.032 [sec])
Background time interval of the image:
-60.848 -6.848 (delta_t = 54.000 [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 0.000 sec. to 0.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.21046 ( 1.18663 1.18663 )
Norm@50keV : 6.14462E-04 ( -0.000619223 0.00253144 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.37 using 59 PHA bins.
# Reduced chi-squared = 1.340 for 57 degrees of freedom
# Null hypothesis probability = 4.430521e-02
Photon flux (15-150 keV) in 0.032 sec: 0.157187 ( -0.157153 0.295003 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.35373e-10 ( -8.35373e-10 1.36901e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 0.0 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.65 using 59 PHA bins.
# Reduced chi-squared = 1.387 for 56 degrees of freedom
# Null hypothesis probability = 2.935855e-02
Photon flux (15-150 keV) in 0.032 sec: 0.391769 0.410388 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.59735e-15 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -9.37167 ( 8.86622 8.86622 )
Epeak [keV] : 178.081 ( )
Norm@50keV : 4.68483E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.81 using 59 PHA bins.
# Reduced chi-squared = 1.378 for 55 degrees of freedom
# Null hypothesis probability = 3.291766e-02
Photon flux (15-150 keV) in 0.032 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] : 5.00000 (-5 -5)
R^2/D10^2 : 0.0 (0 0)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.65 using 59 PHA bins.
# Reduced chi-squared = 1.362 for 57 degrees of freedom
# Null hypothesis probability = 3.586898e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.00000 (-7 -7)
Norm : 0.0 (0 0)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.65 using 59 PHA bins.
# Reduced chi-squared = 1.362 for 57 degrees of freedom
# Null hypothesis probability = 3.586898e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.166 (-199.168 -199.168)
R1^2/D10^2 : 1.07727E-04 (-0.000105312 -0.000105312)
kT2 [keV] : 10.0000 (-10 -10)
R2^2/D10^2 : 0.0 (0 0)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.65 using 59 PHA bins.
#Fit statistic : Chi-Squared = 76.45 using 59 PHA bins.
# Reduced chi-squared = 1.412 for 55 degrees of freedom
# Reduced chi-squared = 1.390 for 55 degrees of freedom
# Null hypothesis probability = 2.383148e-02
# Null hypothesis probability = 2.946361e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.21046 ( 1.18663 1.18663 )
Norm@50keV : 6.14462E-04 ( -0.000619223 0.00253144 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.37 using 59 PHA bins.
# Reduced chi-squared = 1.340 for 57 degrees of freedom
# Null hypothesis probability = 4.430521e-02
Photon flux (15-150 keV) in 0.032 sec: 0.157187 ( -0.157153 0.295003 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.35373e-10 ( -8.35373e-10 1.36901e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 0.0 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.65 using 59 PHA bins.
# Reduced chi-squared = 1.387 for 56 degrees of freedom
# Null hypothesis probability = 2.935855e-02
Photon flux (15-150 keV) in 0.032 sec: 0.391769 0.410388 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.59735e-15 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -9.37167 ( 8.86622 8.86622 )
Epeak [keV] : 178.081 ( )
Norm@50keV : 4.68483E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.81 using 59 PHA bins.
# Reduced chi-squared = 1.378 for 55 degrees of freedom
# Null hypothesis probability = 3.291766e-02
Photon flux (15-150 keV) in 0.032 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] : 5.00000 (-5 -5)
R^2/D10^2 : 0.0 (0 0)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.65 using 59 PHA bins.
# Reduced chi-squared = 1.362 for 57 degrees of freedom
# Null hypothesis probability = 3.586898e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.00000 (-7 -7)
Norm : 0.0 (0 0)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.65 using 59 PHA bins.
# Reduced chi-squared = 1.362 for 57 degrees of freedom
# Null hypothesis probability = 3.586898e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.166 (-199.168 -199.168)
R1^2/D10^2 : 1.07727E-04 (-0.000105312 -0.000105312)
kT2 [keV] : 10.0000 (-10 -10)
R2^2/D10^2 : 0.0 (0 0)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.65 using 59 PHA bins.
#Fit statistic : Chi-Squared = 76.45 using 59 PHA bins.
# Reduced chi-squared = 1.412 for 55 degrees of freedom
# Reduced chi-squared = 1.390 for 55 degrees of freedom
# Null hypothesis probability = 2.383148e-02
# Null hypothesis probability = 2.946361e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Sat Oct 26 07:25:24 EDT 2019