batgrbproduct Analysis for Trigger=618556
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): Fri Nov 14 20:24:59 EST 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger618556/GCN5_download_cron
======================================================================
Trigger: 00618556 Segment: 000
BAT Trigger Time: 437643136 [s; MET]
Trigger Stop: 437644864 [s; MET]
UTC: 2014-11-14T07:32:03.214420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 271.716588039566 Dec: -24.585441998152 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 9.83
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.83
Flight Position: [ source = BAT ]
RA: 271.716588039566 Dec: -24.585441998152 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 271.700721426511 Dec: -24.6115854408431 [deg; J2000]
{ 18h 06m 48.2s , -24d 36' 41.7" }
+/- 3.17252629773759 [arcmin] (estimated 90% radius based on SNR)
+/- 1.90551883695447 [arcmin] (formal 1-sigma fit error)
SNR: 5.84554749116917
Angular difference between Flight and Ground position is 1.791589 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 1728 +/-
Measured from: 0
to: 1728 [s; relative to TRIGTIME]
T50: 1728 +/-
Measured from: 0
to: 1728 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1728 second)
Measured from: 0
to: 1728 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1728 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.263010 1.811052 0.689432 0.166242
0.191689 0.173856 0.142665 0.122037 [error]
Peak 2.263010 1.811052 0.689432 0.166242
0.191689 0.173856 0.142665 0.122037 [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 6.41e-07 7.22e-07 5.83e-07 7.82e-07 2.23e-06 2.73e-06 erg/cm2
Error 9.41e-08 8.11e-08 1.29e-07 3.37e-07 2.90e-07 4.95e-07 erg/cm2
Peak flux Power-law 2.68e-02 1.68e-02 6.77e-03 3.69e-03 5.22e-02 5.40e-02 ph/cm2/s
Error 4.02e-03 1.84e-03 1.45e-03 1.48e-03 5.57e-03 5.75e-03 ph/cm2/s
Fluence Cutoff-PL 6.28e-07 7.47e-07 5.62e-07 4.21e-07 2.16e-06 2.36e-06 erg/cm2
Error 1.03e-07 1.06e-07 1.52e-07 5.67e-07 3.48e-07 6.82e-07 erg/cm2
Peak flux Cutoff-PL 2.61e-02 1.73e-02 6.59e-03 2.24e-03 5.15e-02 5.23e-02 ph/cm2/s
Error 4.46e-03 2.39e-03 1.60e-03 2.61e-03 5.91e-03 6.72e-03 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 2.310 0.232 - - 2.97e-04 4.72e-05 41.330 57
CPL 1.961 0.000 4.3 0.0 4.82e-04 0.00e+00 41.010 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.310 0.232 - - 2.97e-04 4.72e-05 41.330 57
CPL 1.961 0.000 4.3 0.0 4.82e-04 0.00e+00 41.010 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 1728.000 0.000 1728.000
T90 1728.000 0.000 1728.000
T50 1728.000 0.000 1728.000
Peak 1728.000 0.000 1728.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
271.7007 -24.6116 0.0329 13.8 -135.6 4.0340 5.8 TRIG_00618556
------------------------------------------
Foreground time interval of the image:
158.000 183.091 (delta_t = 25.091 [sec])
203.000 963.040 (delta_t = 760.040 [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
158.000000 183.091400
203.000000 963.040000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.30974 ( -0.223005 0.240103 )
Norm@50keV : 2.97058E-04 ( -4.77649e-05 4.67173e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.33 using 59 PHA bins.
# Reduced chi-squared = 0.7251 for 57 degrees of freedom
# Null hypothesis probability = 9.411888e-01
Photon flux (15-150 keV) in 785.1 sec: 5.21963E-02 ( -0.00557224 0.00557539 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.23273e-06 ( -2.86129e-07 2.94455e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
158.000000 183.091400
203.000000 963.040000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96144 ( )
Epeak [keV] : 4.28320 ( )
Norm@50keV : 4.82054E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.01 using 59 PHA bins.
# Reduced chi-squared = 0.7324 for 56 degrees of freedom
# Null hypothesis probability = 9.334815e-01
Photon flux (15-150 keV) in 785.1 sec: 5.14941E-02 ( -0.0059148 0.0059084 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.15514e-06 ( -3.41448e-07 3.53805e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
158.000000 183.091400
203.000000 963.040000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.87650 ( 0.536612 0.536612 )
beta : -2.67610 ( 2.65224 0.551238 )
Epeak [keV] : 10.7542 ( -10.7367 44.3932 )
Norm@50keV : 5.45770E-04 ( -0.000157989 185441 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.96 using 59 PHA bins.
# Reduced chi-squared = 0.7447 for 55 degrees of freedom
# Null hypothesis probability = 9.204848e-01
Photon flux (15-150 keV) in 785.1 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] : 8.38859 (-1.03189 1.16467)
R^2/D10^2 : 4.55388E-02 (-0.0186284 0.0322756)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.49 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 57 degrees of freedom
# Null hypothesis probability = 4.206226e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.702e-07 8.832e-08
25- 50 8.921e-07 1.320e-07
50-150 2.731e-07 8.459e-08
15-150 1.635e-06 2.171e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 41.5910 (-10.4882 16.2655)
Norm : 0.324470 (-0.0652395 0.0864793)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.13 using 59 PHA bins.
# Reduced chi-squared = 0.7392 for 57 degrees of freedom
# Null hypothesis probability = 9.294942e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.925e-07 8.459e-08
25- 50 7.925e-07 1.068e-07
50-150 6.395e-07 2.199e-07
15-150 2.024e-06 2.960e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.49269 (-1.2694 1.89217)
R1^2/D10^2 : 1.21434 (-1.01788 14.8338)
kT2 [keV] : 12.1177 (-2.53448 5.53473)
R2^2/D10^2 : 8.31761E-03 (-0.00677772 0.0151606)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.51 using 59 PHA bins.
# Reduced chi-squared = 0.7547 for 55 degrees of freedom
# Null hypothesis probability = 9.106396e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.348e-07 3.115e-07
25- 50 7.501e-07 3.723e-07
50-150 5.747e-07 3.405e-07
15-150 1.960e-06 8.637e-07
Peak spectrum fit
Power-law model
Time interval is from 203.000 sec. to 963.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.30974 ( -0.223005 0.240103 )
Norm@50keV : 2.97058E-04 ( -4.77649e-05 4.67173e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.33 using 59 PHA bins.
# Reduced chi-squared = 0.7251 for 57 degrees of freedom
# Null hypothesis probability = 9.411888e-01
Photon flux (15-150 keV) in 785.1 sec: 5.21963E-02 ( -0.00557224 0.00557539 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.23273e-06 ( -2.86129e-07 2.94455e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 203.000 sec. to 963.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96144 ( )
Epeak [keV] : 4.28320 ( )
Norm@50keV : 4.82054E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.01 using 59 PHA bins.
# Reduced chi-squared = 0.7324 for 56 degrees of freedom
# Null hypothesis probability = 9.334815e-01
Photon flux (15-150 keV) in 785.1 sec: 5.14941E-02 ( -0.0059148 0.0059084 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.15514e-06 ( -3.41448e-07 3.53805e-07 ) ergs/cm2
Band function
Time interval is from 203.000 sec. to 963.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.87650 ( 0.536612 0.536612 )
beta : -2.67610 ( 2.65224 0.551238 )
Epeak [keV] : 10.7542 ( -10.7367 44.3932 )
Norm@50keV : 5.45770E-04 ( -0.000157989 185441 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.96 using 59 PHA bins.
# Reduced chi-squared = 0.7447 for 55 degrees of freedom
# Null hypothesis probability = 9.204848e-01
Photon flux (15-150 keV) in 785.1 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] : 8.38859 (-1.03189 1.16467)
R^2/D10^2 : 4.55388E-02 (-0.0186284 0.0322756)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.49 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 57 degrees of freedom
# Null hypothesis probability = 4.206226e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.702e-07 9.107e-08
25- 50 8.921e-07 1.433e-07
50-150 2.731e-07 9.205e-08
15-150 1.635e-06 2.347e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 41.5910 (-10.4882 16.2655)
Norm : 0.324470 (-0.0652395 0.0864793)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.13 using 59 PHA bins.
# Reduced chi-squared = 0.7392 for 57 degrees of freedom
# Null hypothesis probability = 9.294942e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.925e-07 8.817e-08
25- 50 7.925e-07 1.061e-07
50-150 6.395e-07 2.130e-07
15-150 2.024e-06 2.999e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.49269 (-1.2694 1.89217)
R1^2/D10^2 : 1.21434 (-1.01788 14.8338)
kT2 [keV] : 12.1177 (-2.53448 5.53473)
R2^2/D10^2 : 8.31761E-03 (-0.00677772 0.0151606)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.51 using 59 PHA bins.
# Reduced chi-squared = 0.7547 for 55 degrees of freedom
# Null hypothesis probability = 9.106396e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.348e-07 3.086e-07
25- 50 7.501e-07 3.171e-07
50-150 5.747e-07 3.367e-07
15-150 1.960e-06 8.956e-07
Plot creation:
Fri Nov 14 20:27:39 EST 2014