batgrbproduct Analysis for Trigger=596426
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): Sat Apr 19 22:46:59 EDT 2014
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger596426/GCN5_download_cron
======================================================================
Trigger: 00596426 Segment: 000
BAT Trigger Time: 419573222.976 [s; MET]
Trigger Stop: 419573224 [s; MET]
UTC: 2014-04-19T04:06:51.071220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 126.99951654378 Dec: 46.2209756335083 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.96
Image Trigger?: NO
Rate S/N Ratio: 40.9756024970958 [ if not an image trigger ]
Image S/N Ratio: 11.96
Flight Position: [ source = BAT ]
RA: 126.99951654378 Dec: 46.2209756335083 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 127.001139895457 Dec: 46.2342772509858 [deg; J2000]
{ 08h 28m 00.3s , +46d 14' 03.4" }
+/- 0.692449259855684 [arcmin] (estimated 90% radius based on SNR)
+/- 0.188659579819996 [arcmin] (formal 1-sigma fit error)
SNR: 51.4204160862355
Angular difference between Flight and Ground position is 0.800936 arcmin
Partial Coding Fraction: 0.3320312 [ including projection effects ]
Duration
T90: 80.0759999155998 +/- 3.81721576852457
Measured from: -2.43599987030029
to: 77.6400000452995 [s; relative to TRIGTIME]
T50: 38.7319999337196 +/- 0.777452250156953
Measured from: 8.57600009441376
to: 47.3080000281334 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 51.4239999651909
to: 52.4239999651909 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.60400003194809
to: 125.011999964714 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.504364 7.418343 7.448682 2.629719
0.090346 0.100375 0.096933 0.083519 [error]
Peak 0.108943 0.207833 0.204624 0.063235
0.007230 0.008571 0.008657 0.006537 [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 1.51e-06 3.34e-06 5.83e-06 2.38e-05 1.59e-05 3.44e-05 erg/cm2
Error 6.15e-08 7.94e-08 1.10e-07 1.09e-06 2.85e-07 1.11e-06 erg/cm2
Peak flux Power-law 1.25e+00 1.54e+00 1.37e+00 2.12e+00 4.90e+00 6.29e+00 ph/cm2/s
Error 1.11e-01 8.31e-02 6.97e-02 2.28e-01 2.28e-01 2.98e-01 ph/cm2/s
Fluence Cutoff-PL 1.48e-06 3.34e-06 5.87e-06 2.25e-05 1.59e-05 3.32e-05 erg/cm2
Error 8.08e-08 7.89e-08 1.17e-07 2.54e-06 2.92e-07 2.05e-06 erg/cm2
Peak flux Cutoff-PL 1.13e+00 1.58e+00 1.44e+00 1.43e+00 4.82e+00 5.58e+00 ph/cm2/s
Error 1.40e-01 9.09e-02 8.75e-02 3.89e-01 2.36e-01 4.91e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 5.92e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.195 0.034 - - 1.17e-02 2.15e-04 47.710 57
CPL 1.190 0.000 10000.0 0.0 1.18e-02 2.06e-04 47.640 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.165 0.077 - - 4.20e-02 1.89e-03 53.720 57
CPL 0.757 0.324 172.3 195.2 6.43e-02 2.19e-02 48.670 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: 72.256000 sec.
T50 in the 50-300 keV band: 29.248000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 133.616 -8.604 125.012
T90 80.076 -2.436 77.640
T50 38.732 8.576 47.308
Peak 1.000 51.424 52.424
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
127.0011 +46.2343 0.0037 36.5 142.3 9.2481 51.4 TRIG_00596426
------------------------------------------
Foreground time interval of the image:
-8.604 15.725 (delta_t = 24.329 [sec])
Background time interval of the image:
-239.976 -8.604 (delta_t = 231.372 [sec])
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 -8.604 sec. to 125.012 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19479 ( -0.0337432 0.0336114 )
Norm@50keV : 1.17467E-02 ( -0.000215498 0.000214935 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.71 using 59 PHA bins.
# Reduced chi-squared = 0.8371 for 57 degrees of freedom
# Null hypothesis probability = 8.047029e-01
Photon flux (15-150 keV) in 133.6 sec: 1.37782 ( -0.0278362 0.027911 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59453e-05 ( -2.85026e-07 2.85156e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.604 sec. to 125.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18975 ( )
Epeak [keV] : 9999.99 ( )
Norm@50keV : 1.18026E-02 ( -0.00020624 0.000205769 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.64 using 59 PHA bins.
# Reduced chi-squared = 0.8507 for 56 degrees of freedom
# Null hypothesis probability = 7.791570e-01
Photon flux (15-150 keV) in 133.6 sec: 1.37588 ( -0.03565 0.02911 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59238e-05 ( -2.9873e-07 2.85102e-07 ) ergs/cm2
Band function
Time interval is from -8.604 sec. to 125.012 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.901591 ( 0.849536 5.75492 )
beta : -1.22742 ( 1.22748 0.0541277 )
Epeak [keV] : 162.433 ( -148.433 277.26 )
Norm@50keV : 1.67370E-02 ( -0.00448202 507.5 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.81 using 59 PHA bins.
# Reduced chi-squared = 0.8330 for 55 degrees of freedom
# Null hypothesis probability = 8.065961e-01
Photon flux (15-150 keV) in 133.6 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] : 21.8577 ( )
R^2/D10^2 : 4.63939E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 628.73 using 59 PHA bins.
# Reduced chi-squared = 11.030 for 57 degrees of freedom
# Null hypothesis probability = 2.711982e-97
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.497e-07 2.077e-08
25- 50 2.895e-06 7.749e-08
50-150 1.033e-05 2.732e-07
15-150 1.378e-05 2.672e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 6.03318 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 448.37 using 59 PHA bins.
# Reduced chi-squared = 7.8661 for 57 degrees of freedom
# Null hypothesis probability = 3.782298e-62
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.007e-06 4.208e-08
25- 50 3.861e-06 7.949e-08
50-150 8.468e-06 1.764e-07
15-150 1.434e-05 2.806e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.34689 (-0.724399 0.767737)
R1^2/D10^2 : 0.453284 (-0.0960608 0.130679)
kT2 [keV] : 38.2847 (-3.1728 4.15582)
R2^2/D10^2 : 6.41013E-03 (-0.00175343 0.00206469)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.71 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 55 degrees of freedom
# Null hypothesis probability = 3.083711e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.216e-06 7.882e-08
25- 50 3.488e-06 1.296e-07
50-150 1.119e-05 4.649e-07
15-150 1.589e-05 5.812e-07
Peak spectrum fit
Power-law model
Time interval is from 51.424 sec. to 52.424 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16486 ( -0.0775705 0.0772808 )
Norm@50keV : 4.19524E-02 ( -0.00188528 0.00188495 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.72 using 59 PHA bins.
# Reduced chi-squared = 0.9425 for 57 degrees of freedom
# Null hypothesis probability = 5.987800e-01
Photon flux (15-150 keV) in 1 sec: 4.90138 ( -0.227869 0.228119 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.29966e-07 ( -2.113e-08 2.11777e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 51.424 sec. to 52.424 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.756929 ( -0.33608 0.31265 )
Epeak [keV] : 172.334 ( -53.3799 337.095 )
Norm@50keV : 6.42852E-02 ( -0.0175648 0.0261591 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.67 using 59 PHA bins.
# Reduced chi-squared = 0.8691 for 56 degrees of freedom
# Null hypothesis probability = 7.458213e-01
Photon flux (15-150 keV) in 1 sec: 4.82097 ( -0.23543 0.23563 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.22604e-07 ( -2.2325e-08 2.2215e-08 ) ergs/cm2
Band function
Time interval is from 51.424 sec. to 52.424 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.756895 ( -0.28834 0.243451 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 172.304 ( -36.3436 336.458 )
Norm@50keV : 6.42840E-02 ( -0.017568 0.0261641 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.67 using 59 PHA bins.
# Reduced chi-squared = 0.8849 for 55 degrees of freedom
# Null hypothesis probability = 7.135944e-01
Photon flux (15-150 keV) in 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] : 19.6599 ( )
R^2/D10^2 : 0.244421 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 124.26 using 59 PHA bins.
# Reduced chi-squared = 2.1801 for 57 degrees of freedom
# Null hypothesis probability = 6.590726e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.833e-08 1.675e-09
25- 50 9.029e-08 5.970e-09
50-150 2.580e-07 2.045e-08
15-150 3.667e-07 1.945e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 20.3219 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 120.09 using 59 PHA bins.
# Reduced chi-squared = 2.1069 for 57 degrees of freedom
# Null hypothesis probability = 2.126456e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.060e-08 2.665e-09
25- 50 9.734e-08 4.855e-09
50-150 2.135e-07 1.300e-08
15-150 3.614e-07 1.765e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.18564 (-1.83152 1.99246)
R1^2/D10^2 : 1.59484 (-0.650226 1.45444)
kT2 [keV] : 33.3212 (-5.6419 10.4837)
R2^2/D10^2 : 3.51440E-02 (-0.0206892 0.0322532)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.04 using 59 PHA bins.
# Reduced chi-squared = 0.9098 for 55 degrees of freedom
# Null hypothesis probability = 6.642548e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.218e-08 6.350e-09
25- 50 9.475e-08 1.585e-08
50-150 2.977e-07 7.210e-08
15-150 4.246e-07 8.110e-08
Plot creation:
Sat Apr 19 23:23:57 EDT 2014