batgrbproduct Analysis for Trigger=731257
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 Jan 10 10:59:05 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger731257/GCN5_download_cron
======================================================================
Trigger: 00731257 Segment: 000
BAT Trigger Time: 505665664 [s; MET]
Trigger Stop: 505666376 [s; MET]
UTC: 2017-01-09T14:40:45.565060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 259.901375085413 Dec: -24.9976730621702 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.24
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 14.24
Flight Position: [ source = BAT ]
RA: 259.901375085413 Dec: -24.9976730621702 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 259.885043888428 Dec: -25.0193116993637 [deg; J2000]
{ 17h 19m 32.4s , -25d 01' 09.5" }
+/- 1.58459508950457 [arcmin] (estimated 90% radius based on SNR)
+/- 0.585293403865556 [arcmin] (formal 1-sigma fit error)
SNR: 15.758714965632
Angular difference between Flight and Ground position is 1.572953 arcmin
Partial Coding Fraction: 0.2265625 [ including projection effects ]
Duration
T90: 712 +/-
Measured from: 0
to: 712 [s; relative to TRIGTIME]
T50: 712 +/-
Measured from: 0
to: 712 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 712 second)
Measured from: 0
to: 712 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 712 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.111559 7.151921 4.033813 0.570908
0.378765 0.349155 0.293519 0.249924 [error]
Peak 6.111559 7.151921 4.033813 0.570908
0.378765 0.349155 0.293519 0.249924 [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 2.25e-06 3.12e-06 3.21e-06 6.02e-06 1.05e-05 1.46e-05 erg/cm2
Error 2.18e-07 1.85e-07 2.95e-07 1.16e-06 6.79e-07 1.42e-06 erg/cm2
Peak flux Power-law 1.03e-01 7.89e-02 4.05e-02 3.00e-02 2.36e-01 2.52e-01 ph/cm2/s
Error 1.02e-02 4.75e-03 3.59e-03 5.34e-03 1.47e-02 1.49e-02 ph/cm2/s
Fluence Cutoff-PL 2.17e-06 3.20e-06 3.22e-06 4.09e-06 1.03e-05 1.27e-05 erg/cm2
Error 2.51e-07 2.28e-07 3.07e-07 2.42e-06 7.83e-07 2.34e-06 erg/cm2
Peak flux Cutoff-PL 9.91e-02 8.06e-02 4.09e-02 2.22e-02 2.33e-01 2.43e-01 ph/cm2/s
Error 1.21e-02 5.65e-03 3.75e-03 1.06e-02 1.58e-02 2.05e-02 ph/cm2/s
Fluence Band 2.17e-06 3.35e-06 2.94e-06 4.40e-06 1.00e-05 1.29e-05 erg/cm2
Error 5.04e-07 -------- 5.54e-07 -------- 9.25e-07 -------- 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 1.961 0.114 - - 1.60e-03 1.07e-04 47.690 57
CPL 1.724 0.450 53.9 -3.7 2.14e-03 0.00e+00 46.790 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.961 0.114 - - 1.60e-03 1.07e-04 47.690 57
CPL 1.724 0.450 53.9 -1.3 2.14e-03 0.00e+00 46.790 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 712.000 0.000 712.000
T90 712.000 0.000 712.000
T50 712.000 0.000 712.000
Peak 712.000 0.000 712.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
259.8850 -25.0193 0.0123 37.6 -70.8 19.1912 15.8 TRIG_00731257
------------------------------------------
Foreground time interval of the image:
0.000 130.314 (delta_t = 130.314 [sec])
131.000 712.000 (delta_t = 581.000 [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 130.314200
131.000000 712.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96112 ( -0.113228 0.115676 )
Norm@50keV : 1.60227E-03 ( -0.000107242 0.000106094 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.69 using 59 PHA bins.
# Reduced chi-squared = 0.8367 for 57 degrees of freedom
# Null hypothesis probability = 8.053974e-01
Photon flux (15-150 keV) in 711.3 sec: 0.236144 ( -0.014632 0.014676 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04921e-05 ( -6.77056e-07 6.81428e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 130.314200
131.000000 712.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72377 ( -0.467643 0.432431 )
Epeak [keV] : 53.8841 ( -46.4489 -53.8841 )
Norm@50keV : 2.14263E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.79 using 59 PHA bins.
# Reduced chi-squared = 0.8356 for 56 degrees of freedom
# Null hypothesis probability = 8.048512e-01
Photon flux (15-150 keV) in 711.3 sec: 0.232743 ( -0.015774 0.015791 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02739e-05 ( -7.84777e-07 7.81007e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 130.314200
131.000000 712.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.72377 ( 1.78848 0.442919 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 53.8740 ( -20.2232 -53.874 )
Norm@50keV : 2.14214E-03 ( -0.000554981 0.000725864 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.79 using 59 PHA bins.
# Reduced chi-squared = 0.8507 for 55 degrees of freedom
# Null hypothesis probability = 7.766661e-01
Photon flux (15-150 keV) in 711.3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00409e-05 ( -1.00359e-05 -1.21533e-06 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.2002 ( )
R^2/D10^2 : 6.81202E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 115.74 using 59 PHA bins.
# Reduced chi-squared = 2.0305 for 57 degrees of freedom
# Null hypothesis probability = 7.001262e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.274e-06 1.444e-07
25- 50 3.687e-06 2.703e-07
50-150 2.649e-06 3.642e-07
15-150 7.610e-06 5.317e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.9703 (-14.3537 19.8311)
Norm : 1.09039 (-0.105955 0.1209)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.94 using 59 PHA bins.
# Reduced chi-squared = 0.8586 for 57 degrees of freedom
# Null hypothesis probability = 7.673614e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.011e-06 1.810e-07
25- 50 3.300e-06 2.056e-07
50-150 4.617e-06 6.263e-07
15-150 9.928e-06 8.038e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.27377 (-1.09962 1.15344)
R1^2/D10^2 : 0.454931 (-0.205723 0.485739)
kT2 [keV] : 22.2475 (-4.24303 6.88045)
R2^2/D10^2 : 3.64131E-03 (-0.00232356 0.00491932)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.73 using 59 PHA bins.
# Reduced chi-squared = 0.8861 for 55 degrees of freedom
# Null hypothesis probability = 7.114419e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.035e-06 4.097e-07
25- 50 3.231e-06 5.861e-07
50-150 4.863e-06 1.569e-06
15-150 1.013e-05 2.289e-06
Peak spectrum fit
Power-law model
Time interval is from 131.000 sec. to 712.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96112 ( -0.113228 0.115676 )
Norm@50keV : 1.60227E-03 ( -0.000107242 0.000106094 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.69 using 59 PHA bins.
# Reduced chi-squared = 0.8367 for 57 degrees of freedom
# Null hypothesis probability = 8.053974e-01
Photon flux (15-150 keV) in 711.3 sec: 0.236144 ( -0.014632 0.014676 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04921e-05 ( -6.77056e-07 6.81428e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 131.000 sec. to 712.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72377 ( -0.467643 0.432431 )
Epeak [keV] : 53.8841 ( -51.3273 -53.8841 )
Norm@50keV : 2.14263E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.79 using 59 PHA bins.
# Reduced chi-squared = 0.8356 for 56 degrees of freedom
# Null hypothesis probability = 8.048512e-01
Photon flux (15-150 keV) in 711.3 sec: 0.232743 ( -0.015774 0.015791 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02739e-05 ( -7.84777e-07 7.81007e-07 ) ergs/cm2
Band function
Time interval is from 131.000 sec. to 712.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.72377 ( 1.78848 0.442919 )
beta : -10.00000 ( 10 4.67182e-13 )
Epeak [keV] : 53.8740 ( -21.4096 -53.874 )
Norm@50keV : 2.14214E-03 ( -0.000554981 0.000725864 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.79 using 59 PHA bins.
# Reduced chi-squared = 0.8507 for 55 degrees of freedom
# Null hypothesis probability = 7.766661e-01
Photon flux (15-150 keV) in 711.3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00409e-05 ( -1.00359e-05 -1.21533e-06 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.2002 ( )
R^2/D10^2 : 6.81202E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 115.74 using 59 PHA bins.
# Reduced chi-squared = 2.0305 for 57 degrees of freedom
# Null hypothesis probability = 7.001262e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.274e-06 1.469e-07
25- 50 3.687e-06 2.514e-07
50-150 2.649e-06 3.624e-07
15-150 7.610e-06 5.463e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.9703 (-14.3537 19.8311)
Norm : 1.09039 (-0.105955 0.1209)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.94 using 59 PHA bins.
# Reduced chi-squared = 0.8586 for 57 degrees of freedom
# Null hypothesis probability = 7.673614e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.011e-06 1.654e-07
25- 50 3.300e-06 1.942e-07
50-150 4.617e-06 6.462e-07
15-150 9.928e-06 7.469e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.27377 (-1.09962 1.15344)
R1^2/D10^2 : 0.454931 (-0.205723 0.485739)
kT2 [keV] : 22.2475 (-4.24303 6.88045)
R2^2/D10^2 : 3.64131E-03 (-0.00232356 0.00491932)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.73 using 59 PHA bins.
# Reduced chi-squared = 0.8861 for 55 degrees of freedom
# Null hypothesis probability = 7.114419e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.035e-06 4.559e-07
25- 50 3.231e-06 5.900e-07
50-150 4.863e-06 1.802e-06
15-150 1.013e-05 2.594e-06
Plot creation:
Tue Jan 10 11:06:43 EST 2017