batgrbproduct Analysis for Trigger=618673
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 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Sun Nov 16 03:43:20 EST 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger618673/GCN5_download_cron
======================================================================
Trigger: 00618673 Segment: 000
BAT Trigger Time: 437735448 [s; MET]
Trigger Stop: 437735512 [s; MET]
UTC: 2014-11-15T09:10:35.209840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 233.023653384413 Dec: 32.69382955479 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.05
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.05
Flight Position: [ source = BAT ]
RA: 233.023653384413 Dec: 32.69382955479 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 233.029244493403 Dec: 32.6470063404392 [deg; J2000]
{ 15h 32m 07.0s , +32d 38' 49.2" }
+/- 4.88504868710745 [arcmin] (estimated 90% radius based on SNR)
+/- 2.91516945334166 [arcmin] (formal 1-sigma fit error)
SNR: 3.15514960344753
Angular difference between Flight and Ground position is 2.823550 arcmin
Partial Coding Fraction: 0.609375 [ 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 0.142593 0.334791 0.000793 -0.032679
0.063671 0.066301 0.059988 0.058972 [error]
Peak 0.142593 0.334791 0.000793 -0.032679
0.063671 0.066301 0.059988 0.058972 [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 7.07e-08 8.38e-08 7.16e-08 1.05e-07 2.63e-07 3.44e-07 erg/cm2
Error 2.90e-08 3.18e-08 4.46e-08 1.39e-07 1.14e-07 1.93e-07 erg/cm2
Peak flux Power-law 3.60e-02 2.38e-02 1.03e-02 6.10e-03 7.31e-02 7.64e-02 ph/cm2/s
Error 1.50e-02 8.84e-03 6.15e-03 7.48e-03 2.62e-02 2.77e-02 ph/cm2/s
Fluence Cutoff-PL 4.93e-08 1.53e-07 2.19e-08 1.17e-11 2.24e-07 2.24e-07 erg/cm2
Error 3.30e-08 5.16e-08 3.76e-08 2.18e-09 7.71e-08 7.71e-08 erg/cm2
Peak flux Cutoff-PL 2.34e-02 4.37e-02 3.74e-03 1.08e-06 7.08e-02 7.08e-02 ph/cm2/s
Error 1.65e-02 1.44e-02 5.87e-03 1.86e-04 2.40e-02 2.40e-02 ph/cm2/s
Fluence Band 5.49e-08 1.48e-07 2.98e-08 2.85e-10 2.33e-07 2.33e-07 erg/cm2
Error 2.66e-08 4.70e-08 -------- 1.91e-08 -------- -------- erg/cm2
Peak flux Band 2.69e-02 4.20e-02 4.75e-03 2.24e-05 7.37e-02 7.37e-02 ph/cm2/s
Error 1.35e-02 1.28e-02 -------- 1.63e-03 -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.175 0.593 - - 4.48e-04 2.10e-04 74.230 57
CPL -6.618 0.000 33.8 6.1 1.68e+02 0.00e+00 64.770 56
The chi2 of BB fit is 66.36 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 2.175 0.593 - - 4.48e-04 2.10e-04 74.230 57
CPL -6.618 0.000 33.8 6.1 1.68e+02 0.00e+00 64.770 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
233.0292 +32.6470 0.0606 38.1 -160.9 0.4544 3.2 TRIG_00618673
------------------------------------------
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: 2.17471 ( -0.558148 0.627871 )
Norm@50keV : 4.48426E-04 ( -0.000212835 0.000207301 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.23 using 59 PHA bins.
# Reduced chi-squared = 1.302 for 57 degrees of freedom
# Null hypothesis probability = 6.227552e-02
Photon flux (15-150 keV) in 64 sec: 7.31372E-02 ( -0.0261615 0.0261387 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62979e-07 ( -1.09773e-07 1.1746e-07 ) 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: -6.61827 ( )
Epeak [keV] : 33.7632 ( -5.16032 6.97238 )
Norm@50keV : 168.091 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.77 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 56 degrees of freedom
# Null hypothesis probability = 1.974186e-01
Photon flux (15-150 keV) in 64 sec: 7.07916E-02 ( -0.023415 0.0245999 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24367e-07 ( -7.29011e-08 8.13478e-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 : 4.92762 ( -4.37611 -4.92762 )
beta : -9.37167 ( 9.37167 19.3251 )
Epeak [keV] : 34.2080 ( -5.93957 6.32893 )
Norm@50keV : 13.7382 ( -4.08223 40.6937 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.86 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 55 degrees of freedom
# Null hypothesis probability = 1.705782e-01
Photon flux (15-150 keV) in 64 sec: 7.36734E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33057e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.71921 (-1.91249 2.4683)
R^2/D10^2 : 7.02477E-02 (-0.070281 0.114247)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.36 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 57 degrees of freedom
# Null hypothesis probability = 1.855493e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.541e-08 3.901e-08
25- 50 1.322e-07 8.493e-08
50-150 4.573e-08 3.574e-08
15-150 2.433e-07 1.528e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 40.9232 (-19.0714 53.0282)
Norm : 0.499844 (-0.215643 0.356317)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.15 using 59 PHA bins.
# Reduced chi-squared = 1.248 for 57 degrees of freedom
# Null hypothesis probability = 9.841728e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.402e-08 4.539e-08
25- 50 9.834e-08 5.965e-08
50-150 7.798e-08 6.221e-08
15-150 2.503e-07 1.702e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.67434 (-8.71531 -8.71531)
R1^2/D10^2 : 1.26831E-02 (-0.0129231 -0.0129231)
kT2 [keV] : 8.75303 (-8.72224 -8.72224)
R2^2/D10^2 : 5.68976E-02 (-0.057247 -0.057247)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.36 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 55 degrees of freedom
# Null hypothesis probability = 1.402919e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.516e-08 7.382e+00
25- 50 1.322e-07 5.958e+01
50-150 4.605e-08 1.368e+03
15-150 2.434e-07 1.457e+03
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: 2.17471 ( -0.558148 0.627871 )
Norm@50keV : 4.48426E-04 ( -0.000212835 0.000207301 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.23 using 59 PHA bins.
# Reduced chi-squared = 1.302 for 57 degrees of freedom
# Null hypothesis probability = 6.227552e-02
Photon flux (15-150 keV) in 64 sec: 7.31372E-02 ( -0.0261615 0.0261387 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62979e-07 ( -1.09773e-07 1.1746e-07 ) 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: -6.61827 ( )
Epeak [keV] : 33.7632 ( -5.16032 6.97238 )
Norm@50keV : 168.091 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.77 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 56 degrees of freedom
# Null hypothesis probability = 1.974186e-01
Photon flux (15-150 keV) in 64 sec: 7.07916E-02 ( -0.023415 0.0245999 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24367e-07 ( -7.29011e-08 8.13478e-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 : 4.92762 ( -4.37611 -4.92762 )
beta : -9.37167 ( 9.37167 19.3251 )
Epeak [keV] : 34.2080 ( -5.93957 6.32893 )
Norm@50keV : 13.7382 ( -4.08223 40.6937 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.86 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 55 degrees of freedom
# Null hypothesis probability = 1.705782e-01
Photon flux (15-150 keV) in 64 sec: 7.36734E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33057e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.71921 (-1.91249 2.4683)
R^2/D10^2 : 7.02477E-02 (-0.070281 0.114247)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.36 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 57 degrees of freedom
# Null hypothesis probability = 1.855493e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.541e-08 4.154e-08
25- 50 1.322e-07 7.717e-08
50-150 4.573e-08 3.632e-08
15-150 2.433e-07 1.507e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 40.9232 (-19.0714 53.0282)
Norm : 0.499844 (-0.215643 0.356317)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.15 using 59 PHA bins.
# Reduced chi-squared = 1.248 for 57 degrees of freedom
# Null hypothesis probability = 9.841728e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.402e-08 4.284e-08
25- 50 9.834e-08 6.158e-08
50-150 7.798e-08 6.358e-08
15-150 2.503e-07 1.658e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.67434 (-8.71531 -8.71531)
R1^2/D10^2 : 1.26831E-02 (-0.0129231 -0.0129231)
kT2 [keV] : 8.75303 (-8.72224 -8.72224)
R2^2/D10^2 : 5.68976E-02 (-0.057247 -0.057247)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.36 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 55 degrees of freedom
# Null hypothesis probability = 1.402919e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.516e-08 6.336e+00
25- 50 1.322e-07 5.782e+01
50-150 4.605e-08 1.355e+03
15-150 2.434e-07 1.539e+03
Plot creation:
Sun Nov 16 03:46:50 EST 2014