batgrbproduct Analysis for Trigger=727422
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): Tue Dec 20 09:36:49 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger727422/GCN5_download_cron
======================================================================
Trigger: 00727422 Segment: 000
BAT Trigger Time: 503825560 [s; MET]
Trigger Stop: 503825624 [s; MET]
UTC: 2016-12-19T07:32:22.670580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 119.852294516257 Dec: -38.8202100509903 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.84
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.84
Flight Position: [ source = BAT ]
RA: 119.852294516257 Dec: -38.8202100509903 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 119.856613452509 Dec: -38.7874014103745 [deg; J2000]
{ 07h 59m 25.6s , -38d 47' 14.6" }
+/- 5.10410930873429 [arcmin] (estimated 90% radius based on SNR)
+/- 2.42540926388905 [arcmin] (formal 1-sigma fit error)
SNR: 2.96349461218693
Angular difference between Flight and Ground position is 1.978850 arcmin
Partial Coding Fraction: 0.875 [ 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 0.117571 0.197200 -0.021306 -0.013328
0.050713 0.052724 0.045632 0.040151 [error]
Peak 0.117571 0.197200 -0.021306 -0.013328
0.050713 0.052724 0.045632 0.040151 [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 3.13e-08 4.29e-08 4.34e-08 7.97e-08 1.43e-07 1.98e-07 erg/cm2
Error 1.84e-08 2.23e-08 3.25e-08 1.23e-07 8.50e-08 1.63e-07 erg/cm2
Peak flux Power-law 1.59e-02 1.21e-02 6.11e-03 4.44e-03 3.62e-02 3.85e-02 ph/cm2/s
Error 9.49e-03 6.22e-03 4.46e-03 6.32e-03 1.85e-02 2.02e-02 ph/cm2/s
Fluence Cutoff-PL 2.68e-08 8.86e-08 1.19e-08 4.42e-12 1.27e-07 1.27e-07 erg/cm2
Error 2.00e-08 3.65e-08 2.35e-08 1.10e-09 5.31e-08 5.31e-08 erg/cm2
Peak flux Cutoff-PL 1.27e-02 2.52e-02 2.04e-03 3.93e-07 4.00e-02 3.99e-02 ph/cm2/s
Error 9.86e-03 1.00e-02 3.68e-03 9.52e-05 1.60e-02 1.60e-02 ph/cm2/s
Fluence Band 3.04e-08 8.38e-08 1.72e-08 1.62e-10 1.32e-07 1.32e-07 erg/cm2
Error 1.61e-08 3.31e-08 -------- -------- -------- -------- erg/cm2
Peak flux Band 1.48e-02 2.38e-02 2.87e-03 1.39e-05 4.16e-02 4.16e-02 ph/cm2/s
Error 7.67e-03 9.15e-03 -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.977 0.742 - - 2.44e-04 1.47e-04 60.890 57
CPL -6.286 -0.567 34.1 7.4 5.55e+01 1.08e+04 51.600 56
The chi2 of BB fit is 53.79 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 1.977 0.742 - - 2.44e-04 1.47e-04 60.890 57
CPL -6.286 -0.567 34.1 7.4 5.55e+01 1.08e+04 51.600 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
119.8566 -38.7874 0.0647 14.2 -83.9 0.3077 3.0 TRIG_00727422
------------------------------------------
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: 1.97688 ( -0.682825 0.801009 )
Norm@50keV : 2.43502E-04 ( -0.000143865 0.00015007 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.89 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 57 degrees of freedom
# Null hypothesis probability = 3.377467e-01
Photon flux (15-150 keV) in 64 sec: 3.61514E-02 ( -0.0185248 0.0185369 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43192e-07 ( -8.01107e-08 8.99744e-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: -6.28568 ( 6.31231 5.1792 )
Epeak [keV] : 34.0739 ( -6.51014 8.37211 )
Norm@50keV : 55.5381 ( -61.9465 21611.5 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.60 using 59 PHA bins.
# Reduced chi-squared = 0.9214 for 56 degrees of freedom
# Null hypothesis probability = 6.419335e-01
Photon flux (15-150 keV) in 64 sec: 3.99732E-02 ( -0.0157385 0.0163021 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27249e-07 ( -5.0633e-08 5.55635e-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 : 5.00000 ( -4.05545 -5 )
beta : -9.37167 ( 9.37167 19.337 )
Epeak [keV] : 34.7622 ( -7.17118 7.88583 )
Norm@50keV : 7.85243 ( -2.91678 27.6261 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.78 using 59 PHA bins.
# Reduced chi-squared = 0.9414 for 55 degrees of freedom
# Null hypothesis probability = 5.984978e-01
Photon flux (15-150 keV) in 64 sec: 4.16181E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32381e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.99198 (-2.33233 3.17936)
R^2/D10^2 : 3.43006E-02 (-0.0340121 0.0697109)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.79 using 59 PHA bins.
# Reduced chi-squared = 0.9438 for 57 degrees of freedom
# Null hypothesis probability = 5.960803e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.454e-08 2.191e-08
25- 50 7.332e-08 4.733e-08
50-150 2.789e-08 2.327e-08
15-150 1.358e-07 8.979e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 49.2639 (-27.0304 -48.1562)
Norm : 0.226679 (-0.122302 0.207127)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.74 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 57 degrees of freedom
# Null hypothesis probability = 4.114714e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.535e-08 2.467e-08
25- 50 5.050e-08 3.421e-08
50-150 4.835e-08 4.208e-08
15-150 1.342e-07 9.235e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.03243 (-2.31254 3.19848)
R1^2/D10^2 : 3.37665E-02 (-0.0338316 0.0698874)
kT2 [keV] : 0.166538 (-0.166538 -0.166538)
R2^2/D10^2 : 4.84570E-05 (-4.84577e-05 -4.84577e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.79 using 59 PHA bins.
# Reduced chi-squared = 0.9781 for 55 degrees of freedom
# Null hypothesis probability = 5.207622e-01
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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97688 ( -0.682825 0.801009 )
Norm@50keV : 2.43502E-04 ( -0.000143865 0.00015007 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.89 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 57 degrees of freedom
# Null hypothesis probability = 3.377467e-01
Photon flux (15-150 keV) in 64 sec: 3.61514E-02 ( -0.0185248 0.0185369 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43192e-07 ( -8.01107e-08 8.99744e-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: -6.28568 ( 6.31231 5.1792 )
Epeak [keV] : 34.0739 ( -6.51014 8.37211 )
Norm@50keV : 55.5381 ( -61.9465 21611.5 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.60 using 59 PHA bins.
# Reduced chi-squared = 0.9214 for 56 degrees of freedom
# Null hypothesis probability = 6.419335e-01
Photon flux (15-150 keV) in 64 sec: 3.99732E-02 ( -0.0157385 0.0163021 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27249e-07 ( -5.0633e-08 5.55635e-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 : 5.00000 ( -4.05545 -5 )
beta : -9.37167 ( 9.37167 19.337 )
Epeak [keV] : 34.7622 ( -7.17118 7.88583 )
Norm@50keV : 7.85243 ( -2.91678 27.6261 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.78 using 59 PHA bins.
# Reduced chi-squared = 0.9414 for 55 degrees of freedom
# Null hypothesis probability = 5.984978e-01
Photon flux (15-150 keV) in 64 sec: 4.16181E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32381e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.99198 (-2.33233 3.17936)
R^2/D10^2 : 3.43006E-02 (-0.0340121 0.0697109)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.79 using 59 PHA bins.
# Reduced chi-squared = 0.9438 for 57 degrees of freedom
# Null hypothesis probability = 5.960803e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.454e-08 2.130e-08
25- 50 7.332e-08 4.771e-08
50-150 2.789e-08 2.447e-08
15-150 1.358e-07 8.659e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 49.2639 (-27.0304 -48.1562)
Norm : 0.226679 (-0.122303 0.207127)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.74 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 57 degrees of freedom
# Null hypothesis probability = 4.114714e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.535e-08 2.305e-08
25- 50 5.050e-08 3.341e-08
50-150 4.835e-08 4.061e-08
15-150 1.342e-07 9.174e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.03243 (-2.31254 3.19848)
R1^2/D10^2 : 3.37665E-02 (-0.0338316 0.0698874)
kT2 [keV] : 0.166538 (-0.166538 -0.166538)
R2^2/D10^2 : 4.84570E-05 (-4.84577e-05 -4.84577e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.79 using 59 PHA bins.
# Reduced chi-squared = 0.9781 for 55 degrees of freedom
# Null hypothesis probability = 5.207622e-01
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:
Tue Dec 20 09:42:40 EST 2016