batgrbproduct analysis for trigger=1071767
batgrbproduct Analysis for Trigger=1071767
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 v2.48
Process Start Time (local time): Sat Sep 4 19:34:52 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1071767/GCN5_download_cron
======================================================================
Trigger: 01071767 Segment: 000
BAT Trigger Time: 652370472 [s; MET]
Trigger Stop: 652370536 [s; MET]
UTC: 2021-09-03T14:00:44.337000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 186.146840641779 Dec: -62.6917972571762 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 16.49
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 16.49
Flight Position: [ source = BAT ]
RA: 186.146840641779 Dec: -62.6917972571762 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 186.170732852867 Dec: -62.6440502963117 [deg; J2000]
{ 12h 24m 41.0s , -62d 38' 38.6" }
+/- 1.54085560038539 [arcmin] (estimated 90% radius based on SNR)
+/- 0.866864981058834 [arcmin] (formal 1-sigma fit error)
SNR: 16.4016309401872
Angular difference between Flight and Ground position is 2.939457 arcmin
Partial Coding Fraction: 1.015625 [ 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 1.408402 0.433456 -0.016009 -0.005038
0.056711 0.055387 0.049042 0.047974 [error]
Peak 1.408402 0.433456 -0.016009 -0.005038
0.056711 0.055387 0.049042 0.047974 [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 3.84e-07 1.97e-07 6.22e-08 2.52e-08 6.57e-07 6.68e-07 erg/cm2
Error 3.69e-08 2.78e-08 1.84e-08 1.28e-08 6.76e-08 7.17e-08 erg/cm2
Peak flux Power-law 2.06e-01 5.98e-02 9.47e-03 1.72e-03 2.76e-01 2.77e-01 ph/cm2/s
Error 2.01e-02 8.06e-03 2.71e-03 8.27e-04 2.49e-02 2.50e-02 ph/cm2/s
Fluence Cutoff-PL 4.14e-07 1.68e-07 8.13e-10 5.97e-16 5.83e-07 5.83e-07 erg/cm2
Error 4.24e-08 3.51e-08 1.80e-09 9.99e-14 5.37e-08 5.37e-08 erg/cm2
Peak flux Cutoff-PL 2.14e-01 5.60e-02 1.50e-04 5.71e-11 2.70e-01 2.70e-01 ph/cm2/s
Error 2.30e-02 1.05e-02 3.23e-04 9.45e-09 2.48e-02 2.48e-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 3.661 0.249 - - 5.98e-04 1.37e-04 99.870 57
CPL 1.000 0.000 50.0 0.0 3.58e-03 0.00e+00 278.300 56
The chi2 of BB fit is 60.92 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 3.661 0.249 - - 5.98e-04 1.37e-04 99.870 57
CPL 1.000 0.000 50.0 0.0 3.58e-03 0.00e+00 278.300 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
186.1707 -62.6441 0.0117 0.0 -157.8 1.7731 16.4 TRIG_01071767
------------------------------------------
Foreground time interval of the image:
0.000 18.080 (delta_t = 18.080 [sec])
19.000 64.000 (delta_t = 45.000 [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
Multiple GTIs in the spectrum
tstart tstop
0.000000 18.080000
19.000000 64.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.66055 ( -0.240967 0.256158 )
Norm@50keV : 5.98178E-04 ( -0.000130014 0.000144131 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 99.87 using 59 PHA bins.
# Reduced chi-squared = 1.752 for 57 degrees of freedom
# Null hypothesis probability = 3.882830e-04
Photon flux (15-150 keV) in 63.08 sec: 0.276073 ( -0.0249415 0.024948 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.57306e-07 ( -6.67317e-08 6.84532e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 18.080000
19.000000 64.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.58459E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 278.30 using 59 PHA bins.
# Reduced chi-squared = 4.9696 for 56 degrees of freedom
# Null hypothesis probability = 3.145694e-31
Photon flux (15-150 keV) in 63.08 sec: 0.270011 ( -0.024852 0.024754 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.82826e-07 ( -5.34117e-08 5.40356e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 18.080000
19.000000 64.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.52960 ( )
beta : -9.37167 ( )
Epeak [keV] : 24.5380 ( )
Norm@50keV : 3.38838E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 209.82 using 59 PHA bins.
# Reduced chi-squared = 3.8149 for 55 degrees of freedom
# Null hypothesis probability = 6.242247e-20
Photon flux (15-150 keV) in 63.08 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] : 4.31847 (-0.298185 0.322993)
R^2/D10^2 : 5.02892 (-1.60126 2.36301)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.92 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.368165e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.132e-07 5.721e-08
25- 50 1.846e-07 3.037e-08
50-150 3.502e-09 1.826e-09
15-150 6.013e-07 6.532e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.8167 (-1.3449 1.60795)
Norm : 8.39443 (-1.9882 2.65403)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.065e-07 4.794e-08
25- 50 1.939e-07 3.725e-08
50-150 1.636e-08 8.834e-09
15-150 6.167e-07 7.576e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.32489 (-0.305739 0.317969)
R1^2/D10^2 : 4.98831 (-1.57729 2.38695)
kT2 [keV] : 199.363 (-199.363 -199.363)
R2^2/D10^2 : 3.13423E-11 (-4.78301e-14 7.39183)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.126e-07 5.280e-08
25- 50 1.851e-07 3.469e-08
50-150 3.541e-09 1.868e-09
15-150 6.013e-07 8.058e-08
Peak spectrum fit
Power-law model
Time interval is from 19.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.66055 ( -0.240967 0.256158 )
Norm@50keV : 5.98178E-04 ( -0.000130014 0.000144131 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 99.87 using 59 PHA bins.
# Reduced chi-squared = 1.752 for 57 degrees of freedom
# Null hypothesis probability = 3.882830e-04
Photon flux (15-150 keV) in 63.08 sec: 0.276073 ( -0.0249415 0.024948 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.57306e-07 ( -6.67317e-08 6.84532e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 19.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.58459E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 278.30 using 59 PHA bins.
# Reduced chi-squared = 4.9696 for 56 degrees of freedom
# Null hypothesis probability = 3.145694e-31
Photon flux (15-150 keV) in 63.08 sec: 0.270011 ( -0.024852 0.024754 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.82826e-07 ( -5.34117e-08 5.40356e-08 ) ergs/cm2
Band function
Time interval is from 19.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.52960 ( )
beta : -9.37167 ( )
Epeak [keV] : 24.5380 ( )
Norm@50keV : 3.38838E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 209.82 using 59 PHA bins.
# Reduced chi-squared = 3.8149 for 55 degrees of freedom
# Null hypothesis probability = 6.242247e-20
Photon flux (15-150 keV) in 63.08 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.31847 (-0.298185 0.322993)
R^2/D10^2 : 5.02892 (-1.60126 2.36301)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.132e-07 5.851e-08
25- 50 1.846e-07 3.186e-08
50-150 3.502e-09 1.862e-09
15-150 6.013e-07 7.235e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.8167 (-1.3449 1.60795)
Norm : 8.39443 (-1.9882 2.65403)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.065e-07 4.460e-08
25- 50 1.939e-07 3.365e-08
50-150 1.636e-08 8.708e-09
15-150 6.167e-07 7.220e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.32489 (-0.305739 0.317969)
R1^2/D10^2 : 4.98831 (-1.57729 2.38695)
kT2 [keV] : 199.363 (-199.363 -199.363)
R2^2/D10^2 : 3.13423E-11 (-4.78301e-14 7.39183)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.126e-07 5.068e-08
25- 50 1.851e-07 3.220e-08
50-150 3.541e-09 1.882e-09
15-150 6.013e-07 7.598e-08
Plot creation:
Sat Sep 4 19:40:33 EDT 2021