batgrbproduct analysis for trigger=915381
batgrbproduct Analysis for Trigger=915381
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 Jul 20 15:19:27 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger915381/GCN5_download_cron
======================================================================
Trigger: 00915381 Segment: 000
BAT Trigger Time: 585241137.664 [s; MET]
Trigger Stop: 585241138.688 [s; MET]
UTC: 2019-07-19T14:58:34.397080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 240.210492923109 Dec: 12.9774518761248 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.62
Image Trigger?: NO
Rate S/N Ratio: 62.3377895020348 [ if not an image trigger ]
Image S/N Ratio: 18.62
Flight Position: [ source = BAT ]
RA: 240.210492923109 Dec: 12.9774518761248 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 240.207575484464 Dec: 13.0051205620555 [deg; J2000]
{ 16h 00m 49.8s , +13d 00' 18.4" }
+/- 1.2388410707252 [arcmin] (estimated 90% radius based on SNR)
+/- 0.494567168928443 [arcmin] (formal 1-sigma fit error)
SNR: 22.3995327288785
Angular difference between Flight and Ground position is 1.668860 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 185.68799996376 +/- 9.68928564596491
Measured from: 0.652000069618225
to: 186.340000033379 [s; relative to TRIGTIME]
T50: 99.1839998960495 +/- 6.07937362377661
Measured from: 59.1960000991821
to: 158.379999995232 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.26800000667572
to: 1.26800000667572 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0880000591278076
to: 201.963999986649 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.850723 3.312006 2.256428 0.418077
0.119655 0.122716 0.116826 0.126112 [error]
Peak 0.179127 0.273189 0.208479 0.055852
0.011429 0.013019 0.012118 0.010001 [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 7.98e-07 1.34e-06 1.73e-06 4.45e-06 5.09e-06 8.31e-06 erg/cm2
Error 6.33e-08 6.16e-08 1.17e-07 6.62e-07 2.68e-07 7.50e-07 erg/cm2
Peak flux Power-law 1.66e+00 1.79e+00 1.38e+00 1.72e+00 5.48e+00 6.56e+00 ph/cm2/s
Error 1.62e-01 1.06e-01 9.77e-02 2.54e-01 3.04e-01 3.80e-01 ph/cm2/s
Fluence Cutoff-PL 7.71e-07 1.37e-06 1.73e-06 3.14e-06 4.98e-06 7.01e-06 erg/cm2
Error 7.39e-08 7.31e-08 1.21e-07 1.42e-06 3.32e-07 1.43e-06 erg/cm2
Peak flux Cutoff-PL 1.58e+00 1.84e+00 1.41e+00 1.19e+00 5.40e+00 6.02e+00 ph/cm2/s
Error 1.91e-01 1.25e-01 1.07e-01 4.70e-01 3.18e-01 6.35e-01 ph/cm2/s
Fluence Band 7.55e-07 1.38e-06 1.70e-06 4.05e-06 5.00e-06 7.90e-06 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 1.641 0.090 - - 2.71e-03 1.31e-04 62.410 57
CPL 1.437 0.307 131.1 0.0 3.45e-03 0.00e+00 61.370 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.383 0.098 - - 4.52e-02 2.54e-03 45.250 57
CPL 1.081 0.372 151.7 -45.6 6.43e-02 2.89e-02 43.290 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: 177.536000 sec.
T50 in the 50-300 keV band: 71.232000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 202.052 -0.088 201.964
T90 185.688 0.652 186.340
T50 99.184 59.196 158.380
Peak 1.000 0.268 1.268
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
240.2076 +13.0051 0.0086 12.2 -34.0 1.6500 22.4 TRIG_00915381
------------------------------------------
Foreground time interval of the image:
-0.088 15.237 (delta_t = 15.325 [sec])
Background time interval of the image:
-102.563 -0.088 (delta_t = 102.475 [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 -0.088 sec. to 201.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64090 ( -0.0897029 0.090591 )
Norm@50keV : 2.70786E-03 ( -0.000131056 0.000130241 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.41 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 57 degrees of freedom
# Null hypothesis probability = 2.900166e-01
Photon flux (15-150 keV) in 202.1 sec: 0.352527 ( -0.016078 0.0161024 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.09446e-06 ( -2.66665e-07 2.69361e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.088 sec. to 201.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43725 ( -0.365388 0.247864 )
Epeak [keV] : 131.103 ( )
Norm@50keV : 3.45064E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.37 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 56 degrees of freedom
# Null hypothesis probability = 2.896926e-01
Photon flux (15-150 keV) in 202.1 sec: 0.347286 ( -0.018172 0.01815 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.97516e-06 ( -3.32293e-07 3.31767e-07 ) ergs/cm2
Band function
Time interval is from -0.088 sec. to 201.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14388 ( 1.29703 1.29703 )
beta : -1.71633 ( 1.71635 0.145857 )
Epeak [keV] : 61.5643 ( -61.8817 -61.8817 )
Norm@50keV : 5.43230E-03 ( -0.00288403 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.27 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 55 degrees of freedom
# Null hypothesis probability = 2.611910e-01
Photon flux (15-150 keV) in 202.1 sec: 0.346224 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.00155e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.1326 ( )
R^2/D10^2 : 5.91876E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 158.77 using 59 PHA bins.
# Reduced chi-squared = 2.7855 for 57 degrees of freedom
# Null hypothesis probability = 1.541526e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.374e-07 3.880e-08
25- 50 1.523e-06 7.892e-08
50-150 1.671e-06 1.839e-07
15-150 3.631e-06 1.849e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 155.257 (-34.9261 -155.001)
Norm : 1.43610 (-0.073771 0.0856997)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.95 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.040012e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.432e-07 5.416e-08
25- 50 1.384e-06 1.634e-07
50-150 2.771e-06 9.312e-07
15-150 4.899e-06 1.016e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.66666 (-1.05028 1.11512)
R1^2/D10^2 : 0.453957 (-0.182839 0.380203)
kT2 [keV] : 24.4997 (-3.91073 6.02644)
R2^2/D10^2 : 5.05750E-03 (-0.00272038 0.00460469)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.04 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 55 degrees of freedom
# Null hypothesis probability = 2.131972e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.287e-07 1.345e-07
25- 50 1.377e-06 2.035e-07
50-150 2.806e-06 6.144e-07
15-150 4.911e-06 8.337e-07
Peak spectrum fit
Power-law model
Time interval is from 0.268 sec. to 1.268 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38263 ( -0.0975663 0.0980421 )
Norm@50keV : 4.51851E-02 ( -0.00254702 0.00253999 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.25 using 59 PHA bins.
# Reduced chi-squared = 0.7938 for 57 degrees of freedom
# Null hypothesis probability = 8.693834e-01
Photon flux (15-150 keV) in 1 sec: 5.48140 ( -0.304023 0.304167 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.38191e-07 ( -2.80316e-08 2.82306e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.268 sec. to 1.268 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08084 ( -0.402141 0.34089 )
Epeak [keV] : 151.745 ( -60.4909 -151.745 )
Norm@50keV : 6.42955E-02 ( -0.0203197 0.0374739 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.29 using 59 PHA bins.
# Reduced chi-squared = 0.7731 for 56 degrees of freedom
# Null hypothesis probability = 8.928363e-01
Photon flux (15-150 keV) in 1 sec: 5.40415 ( -0.31803 0.31769 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.2679e-07 ( -3.1808e-08 3.1584e-08 ) ergs/cm2
Band function
Time interval is from 0.268 sec. to 1.268 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.174586 ( -1.26734 -0.00124545 )
beta : -1.53771 ( -0.208741 0.159538 )
Epeak [keV] : 46.7968 ( -20.2335 75.1611 )
Norm@50keV : 0.439856 ( -0.449302 972.709 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.02 using 59 PHA bins.
# Reduced chi-squared = 0.7276 for 55 degrees of freedom
# Null hypothesis probability = 9.355357e-01
Photon flux (15-150 keV) in 1 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] : 15.1605 (-1.13122 1.25663)
R^2/D10^2 : 0.605863 (-0.143666 0.18486)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 109.36 using 59 PHA bins.
# Reduced chi-squared = 1.9186 for 57 degrees of freedom
# Null hypothesis probability = 3.748221e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.910e-08 3.170e-09
25- 50 1.168e-07 7.950e-09
50-150 1.835e-07 2.080e-08
15-150 3.294e-07 2.365e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-19.4013 -200)
Norm : 22.4748 (-1.23551 1.23551)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.77 using 59 PHA bins.
# Reduced chi-squared = 0.8906 for 57 degrees of freedom
# Null hypothesis probability = 7.065973e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.597e-08 3.610e-09
25- 50 1.077e-07 6.790e-09
50-150 2.361e-07 5.125e-08
15-150 3.998e-07 7.375e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.31903 (-1.27767 1.3793)
R1^2/D10^2 : 3.18469 (-1.17503 2.13957)
kT2 [keV] : 33.0101 (-6.91199 13.2867)
R2^2/D10^2 : 3.35424E-02 (-0.021473 0.0410599)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.27 using 59 PHA bins.
# Reduced chi-squared = 0.6958 for 55 degrees of freedom
# Null hypothesis probability = 9.580179e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.635e-08 9.445e-09
25- 50 1.111e-07 1.974e-08
50-150 2.768e-07 9.975e-08
15-150 4.342e-07 1.427e-07
Plot creation:
Sat Jul 20 15:25:01 EDT 2019