batgrbproduct Analysis for Trigger=649143
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): Mon Jul 20 00:51:17 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger649143/batgroup_hand_proc
======================================================================
Trigger: 00649143 Segment: 000
BAT Trigger Time: 458704480 [s; MET]
Trigger Stop: 458704800 [s; MET]
UTC: 2015-07-16T01:54:25.141060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.969747241854 Dec: -49.8100970422826 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.46
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.46
Flight Position: [ source = BAT ]
RA: 244.969747241854 Dec: -49.8100970422826 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.845365628478 Dec: -49.8817105945206 [deg; J2000]
{ 16h 19m 22.9s , -49d 52' 54.2" }
+/- 4.59057559277889 [arcmin] (estimated 90% radius based on SNR)
+/- 2.60120711080066 [arcmin] (formal 1-sigma fit error)
SNR: 3.4482114495847
Angular difference between Flight and Ground position is 6.451506 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.502114 0.505508 0.055251 -0.086543
0.112844 0.097833 0.084122 0.075324 [error]
Peak 0.502114 0.505508 0.055251 -0.086543
0.112844 0.097833 0.084122 0.075324 [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 1.66e-07 1.57e-07 1.03e-07 1.05e-07 4.69e-07 5.31e-07 erg/cm2
Error 4.85e-08 4.74e-08 6.13e-08 1.35e-07 1.50e-07 2.19e-07 erg/cm2
Peak flux Power-law 1.72e-02 9.08e-03 2.98e-03 1.27e-03 2.99e-02 3.05e-02 ph/cm2/s
Error 5.14e-03 2.64e-03 1.72e-03 1.53e-03 7.46e-03 7.68e-03 ph/cm2/s
Fluence Cutoff-PL 1.55e-07 1.88e-07 7.16e-08 5.77e-09 4.20e-07 4.21e-07 erg/cm2
Error 5.46e-08 6.43e-08 7.65e-08 9.50e-08 1.37e-07 1.86e-07 erg/cm2
Peak flux Cutoff-PL 1.57e-02 1.09e-02 2.22e-03 9.72e-05 2.89e-02 2.90e-02 ph/cm2/s
Error 5.82e-03 3.62e-03 2.24e-03 1.11e-03 7.38e-03 7.40e-03 ph/cm2/s
Fluence Band 1.53e-07 1.87e-07 7.12e-08 5.67e-09 4.19e-07 4.19e-07 erg/cm2
Error 5.39e-08 6.41e-08 -------- -------- 1.33e-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 2.605 0.574 - - 1.43e-04 6.33e-05 52.130 57
CPL 0.667 2.651 23.9 0.0 2.50e-03 0.00e+00 50.400 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 2.605 0.574 - - 1.43e-04 6.33e-05 52.130 57
CPL 0.667 2.651 23.9 0.0 2.50e-03 0.00e+00 50.400 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.8454 -49.8817 0.0556 13.0197 -107.7825 0.9993692 3.448 TRIG_00649143
Foreground time interval of the image:
0.000 14.480 (delta_t = 14.480 [sec])
16.000 320.000 (delta_t = 304.000 [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 14.480000
16.000000 320.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.60483 ( -0.507381 0.640418 )
Norm@50keV : 1.42716E-04 ( -6.24292e-05 6.40863e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.13 using 59 PHA bins.
# Reduced chi-squared = 0.9146 for 57 degrees of freedom
# Null hypothesis probability = 6.577781e-01
Photon flux (15-150 keV) in 318.5 sec: 2.99376E-02 ( -0.00745935 0.00746637 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.68574e-07 ( -1.42746e-07 1.56555e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 14.480000
16.000000 320.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.666818 ( -3.98323 1.31898 )
Epeak [keV] : 23.8843 ( )
Norm@50keV : 2.50500E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.40 using 59 PHA bins.
# Reduced chi-squared = 0.9001 for 56 degrees of freedom
# Null hypothesis probability = 6.857700e-01
Photon flux (15-150 keV) in 318.5 sec: 2.89367E-02 ( -0.0073262 0.0074303 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.19659e-07 ( -1.19701e-07 1.53418e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 14.480000
16.000000 320.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.759176 ( -2.79819 5.51912 )
beta : -9.37167 ( 9.37167 19.3716 )
Epeak [keV] : 23.6295 ( -15.1598 13.0333 )
Norm@50keV : 2.15040E-03 ( -0.00215253 169524 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.41 using 59 PHA bins.
# Reduced chi-squared = 0.9165 for 55 degrees of freedom
# Null hypothesis probability = 6.504318e-01
Photon flux (15-150 keV) in 318.5 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.18665e-07 ( -4.16436e-07 -1.16452e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.33777 (-1.81804 2.23287)
R^2/D10^2 : 4.74147E-02 (-0.0316326 0.109186)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.58 using 59 PHA bins.
# Reduced chi-squared = 0.9050 for 57 degrees of freedom
# Null hypothesis probability = 6.776952e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.368e-07 7.173e-08
25- 50 2.049e-07 1.177e-07
50-150 4.015e-08 2.850e-08
15-150 3.819e-07 1.966e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 28.6638 (-11.9681 24.1187)
Norm : 0.253369 (-0.103044 0.202305)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.58 using 59 PHA bins.
# Reduced chi-squared = 0.8873 for 57 degrees of freedom
# Null hypothesis probability = 7.131856e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.603e-07 6.647e-08
25- 50 1.786e-07 8.727e-08
50-150 9.204e-08 7.225e-08
15-150 4.309e-07 1.929e-07
Double BB
R1^2/D10^2 : 141.227 ( )
kT2 [keV] : 8.30321 (-1.95628 -8.29096)
R2^2/D10^2 : 2.64214E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.87 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.61 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.58 using 59 PHA bins.
# Reduced chi-squared = 0.9067 for 55 degrees of freedom
# Reduced chi-squared = 0.9020 for 55 degrees of freedom
# Reduced chi-squared = 0.9014 for 55 degrees of freedom
# Null hypothesis probability = 6.704961e-01
# Null hypothesis probability = 6.800004e-01
# Null hypothesis probability = 6.811128e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.488e-07 7.235e-08
25- 50 1.972e-07 1.188e-07
50-150 6.421e-08 4.876e-08
15-150 4.102e-07 2.293e-07
Peak spectrum fit
Power-law model
Time interval is from 16.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.60483 ( -0.507381 0.640418 )
Norm@50keV : 1.42716E-04 ( -6.24292e-05 6.40863e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.13 using 59 PHA bins.
# Reduced chi-squared = 0.9146 for 57 degrees of freedom
# Null hypothesis probability = 6.577781e-01
Photon flux (15-150 keV) in 318.5 sec: 2.99376E-02 ( -0.00745935 0.00746637 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.68574e-07 ( -1.42746e-07 1.56555e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 16.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.666818 ( -3.98323 1.31898 )
Epeak [keV] : 23.8843 ( )
Norm@50keV : 2.50500E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.40 using 59 PHA bins.
# Reduced chi-squared = 0.9001 for 56 degrees of freedom
# Null hypothesis probability = 6.857700e-01
Photon flux (15-150 keV) in 318.5 sec: 2.89367E-02 ( -0.0073262 0.0074303 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.19659e-07 ( -1.19701e-07 1.53418e-07 ) ergs/cm2
Band function
Time interval is from 16.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.759176 ( -2.79819 5.51912 )
beta : -9.37167 ( 9.37167 19.3716 )
Epeak [keV] : 23.6295 ( -15.1598 13.0333 )
Norm@50keV : 2.15040E-03 ( -0.00215253 169524 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.41 using 59 PHA bins.
# Reduced chi-squared = 0.9165 for 55 degrees of freedom
# Null hypothesis probability = 6.504318e-01
Photon flux (15-150 keV) in 318.5 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.18665e-07 ( -4.16436e-07 -1.16452e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.33777 (-1.81804 2.23287)
R^2/D10^2 : 4.74147E-02 (-0.0316326 0.109186)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.58 using 59 PHA bins.
# Reduced chi-squared = 0.9050 for 57 degrees of freedom
# Null hypothesis probability = 6.776952e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.368e-07 7.497e-08
25- 50 2.049e-07 1.133e-07
50-150 4.015e-08 2.947e-08
15-150 3.819e-07 2.007e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 28.6638 (-11.9681 24.1187)
Norm : 0.253369 (-0.103044 0.202305)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.58 using 59 PHA bins.
# Reduced chi-squared = 0.8873 for 57 degrees of freedom
# Null hypothesis probability = 7.131856e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.603e-07 6.986e-08
25- 50 1.786e-07 9.061e-08
50-150 9.204e-08 6.795e-08
15-150 4.309e-07 2.021e-07
Double BB
R1^2/D10^2 : 141.227 ( )
kT2 [keV] : 8.30321 (-1.95628 -8.29096)
R2^2/D10^2 : 2.64214E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.87 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.61 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.58 using 59 PHA bins.
# Reduced chi-squared = 0.9067 for 55 degrees of freedom
# Reduced chi-squared = 0.9020 for 55 degrees of freedom
# Reduced chi-squared = 0.9014 for 55 degrees of freedom
# Null hypothesis probability = 6.704961e-01
# Null hypothesis probability = 6.800004e-01
# Null hypothesis probability = 6.811128e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.488e-07 7.179e-08
25- 50 1.972e-07 1.212e-07
50-150 6.421e-08 4.400e-08
15-150 4.102e-07 2.220e-07
Plot creation:
Mon Jul 20 01:15:23 EDT 2015