batgrbproduct Analysis for Trigger=508319
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 25 14:05:17 EST 2011
Host Name: heteswift
Current Working Dir: /net/raid16/prebascript_archive/trigger508319/SDC
======================================================================
Trigger: 00508319 Segment: 000
BAT Trigger Time: 343764808.704 [s; MET]
Trigger Stop: 343764812.8 [s; MET]
UTC: 2011-11-23T18:13:21.100200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 154.851114339607 Dec: -20.6415977436912 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.2
Image Trigger?: NO
Rate S/N Ratio: 11.8743420870379 [ if not an image trigger ]
Image S/N Ratio: 8.2
Flight Position: [ source = BAT ]
RA: 154.851114339607 Dec: -20.6415977436912 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 154.84541638076 Dec: -20.6388473750105 [deg; J2000]
{ 10h 19m 22.9s , -20d 38' 19.9" }
+/- 1.12262240172859 [arcmin] (estimated 90% radius based on SNR)
+/- 0.38183920195233 [arcmin] (formal 1-sigma fit error)
SNR: 25.7843356114101
Angular difference between Flight and Ground position is 0.359985 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 290 +/- 88.090862182181
Measured from: 3.2960000038147
to: 293.296000003815 [s; relative to TRIGTIME]
T50: 81 +/- 7.61577310586391
Measured from: 70.2960000038147
to: 151.296000003815 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 146.296000003815
to: 147.296000003815 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.7039999961853
to: 481.296000003815 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.922679 4.586190 3.255230 0.742069
0.122694 0.125045 0.108573 0.093229 [error]
Peak 0.028461 0.044396 0.038196 0.009802
0.005744 0.006110 0.005309 0.004230 [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 1.20e-06 1.97e-06 2.45e-06 6.05e-06 7.32e-06 1.17e-05 erg/cm2
Error 7.73e-08 7.16e-08 1.13e-07 6.30e-07 2.63e-07 6.98e-07 erg/cm2
Peak flux Power-law 2.79e-01 3.06e-01 2.39e-01 3.06e-01 9.38e-01 1.13e+00 ph/cm2/s
Error 7.63e-02 5.05e-02 4.34e-02 1.19e-01 1.41e-01 1.72e-01 ph/cm2/s
Fluence Cutoff-PL 1.20e-06 1.97e-06 2.45e-06 5.99e-06 7.32e-06 1.12e-05 erg/cm2
Error 8.14e-08 7.19e-08 1.13e-07 1.07e-06 2.68e-07 1.19e-06 erg/cm2
Peak flux Cutoff-PL 2.79e-01 3.06e-01 2.39e-01 3.04e-01 9.37e-01 1.14e+00 ph/cm2/s
Error 7.62e-02 5.08e-02 4.37e-02 1.60e-01 1.41e-01 1.92e-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 0.00e+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 1.684 0.067 - - 1.61e-03 5.51e-05 64.200 57
CPL 1.685 0.094 9999.4 0.0 1.61e-03 0.00e+00 64.210 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.358 0.267 - - 7.77e-03 1.15e-03 52.380 57
CPL 1.355 0.313 9999.3 0.0 7.80e-03 4.41e-03 52.390 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: 197.376000 sec.
T50 in the 50-300 keV band: 72.384000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 490.000 -8.704 481.296
T90 290.000 3.296 293.296
T50 81.000 70.296 151.296
Peak 1.000 146.296 147.296
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
154.8454 -20.6388 0.0075 26.0 167.3 2.2559 25.8 TRIG_00508319
------------------------------------------
Foreground time interval of the image:
-8.704 41.397 (delta_t = 50.101 [sec])
Background time interval of the image:
-239.704 -8.704 (delta_t = 231.000 [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 -8.704 sec. to 481.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68385 ( -0.0666732 0.0670925 )
Norm@50keV : 1.61162E-03 ( -5.51456e-05 5.49796e-05 )
------------------------------------------------------------
# Chi-Squared = 64.20 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 57 degrees of freedom
# Null hypothesis probability = 2.389746e-01
Photon flux (15-150 keV) in 490 sec: 0.212848 ( -0.00777582 0.00781933 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.32133e-06 ( -2.62231e-07 2.63392e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.704 sec. to 481.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68548 ( -0.122257 0.0655224 )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 1.61212E-03 ( )
------------------------------------------------------------
# Chi-Squared = 64.21 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 56 degrees of freedom
# Null hypothesis probability = 2.109210e-01
Photon flux (15-150 keV) in 490 sec: 0.212722 ( -0.007757 0.007806 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.31884e-06 ( -2.69598e-07 2.65972e-07 ) ergs/cm2
Band function
Time interval is from -8.704 sec. to 481.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25738 ( 1.25831 1.25831 )
beta : -1.68892 ( 1.6886 0.0705931 )
Epeak [keV] : 42.3312 ( -41.8888 -41.8888 )
Norm@50keV : 3.37307E-03 ( -0.0018512 0 )
------------------------------------------------------------
# Chi-Squared = 64.13 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 55 degrees of freedom
# Null hypothesis probability = 1.870024e-01
Photon flux (15-150 keV) in 490 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] : 14.7455 ( )
R^2/D10^2 : 2.30283E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 311.95 using 59 PHA bins.
# Reduced chi-squared = 5.4728 for 57 degrees of freedom
# Null hypothesis probability = 7.850846e-37
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.150e-07 3.873e-08
25- 50 2.014e-06 9.139e-08
50-150 2.957e-06 1.926e-07
15-150 5.487e-06 2.132e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 155.383 (30.4552 91.457)
Norm : 0.857973 (-0.0378396 0.0378884)
------------------------------------------------------------
# Chi-Squared = 73.49 using 59 PHA bins.
# Reduced chi-squared = 1.289 for 57 degrees of freedom
# Null hypothesis probability = 6.975865e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.076e-06 6.370e-08
25- 50 2.005e-06 8.354e-08
50-150 4.016e-06 2.781e-07
15-150 7.097e-06 3.528e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.19031 (-0.597299 0.650839)
R1^2/D10^2 : 0.390437 (-0.12493 0.197048)
kT2 [keV] : 25.4143 (-2.35011 2.96764)
R2^2/D10^2 : 2.72891E-03 (-0.000883208 0.00115419)
------------------------------------------------------------
# Chi-Squared = 60.43 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 55 degrees of freedom
# Null hypothesis probability = 2.860993e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.166e-06 1.384e-07
25- 50 1.936e-06 1.399e-07
50-150 4.177e-06 3.793e-07
15-150 7.279e-06 5.022e-07
Peak spectrum fit
Power-law model
Time interval is from 146.296 sec. to 147.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35776 ( -0.267536 0.266097 )
Norm@50keV : 7.77053E-03 ( -0.00115302 0.00114895 )
------------------------------------------------------------
# Chi-Squared = 52.38 using 59 PHA bins.
# Reduced chi-squared = 0.9189 for 57 degrees of freedom
# Null hypothesis probability = 6.488681e-01
Photon flux (15-150 keV) in 1 sec: 0.937632 ( -0.14114 0.141536 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.57624e-08 ( -1.25281e-08 1.26545e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 146.296 sec. to 147.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35507 ( -0.358298 0.266741 )
Epeak [keV] : 9999.26 ( -9963.65 -9963.65 )
Norm@50keV : 7.80011E-03 ( -0.00115948 0.00766594 )
------------------------------------------------------------
# Chi-Squared = 52.39 using 59 PHA bins.
# Reduced chi-squared = 0.9355 for 56 degrees of freedom
# Null hypothesis probability = 6.124340e-01
Photon flux (15-150 keV) in 1 sec: 0.937415 ( -0.139731 0.141275 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.62238e-08 ( -1.29926e-08 1.22016e-08 ) ergs/cm2
Band function
Time interval is from 146.296 sec. to 147.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.87337 ( -17.0605 -17.0605 )
beta : -1.39382 ( -0.301499 0.28731 )
Epeak [keV] : 22.3108 ( -22.31 103.501 )
Norm@50keV : 1157.05 ( -1158.47 85563.7 )
------------------------------------------------------------
# Chi-Squared = 52.27 using 59 PHA bins.
# Reduced chi-squared = 0.9503 for 55 degrees of freedom
# Null hypothesis probability = 5.797382e-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] : 18.3396 (-4.32899 5.62247)
R^2/D10^2 : 5.31719E-02 (-0.0307091 0.0786082)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 72.03 using 59 PHA bins.
# Reduced chi-squared = 1.264 for 57 degrees of freedom
# Null hypothesis probability = 8.675047e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.559e-09 1.200e-09
25- 50 1.669e-08 4.654e-09
50-150 4.093e-08 1.187e-08
15-150 6.118e-08 1.465e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.998 ( )
Norm : 3.86592 (-3.86592 -3.86592)
------------------------------------------------------------
# Chi-Squared = 54.88 using 59 PHA bins.
# Reduced chi-squared = 0.9629 for 57 degrees of freedom
# Null hypothesis probability = 5.548489e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.625e-09 5.270e-09
25- 50 1.851e-08 1.024e-08
50-150 4.060e-08 2.197e-08
15-150 6.874e-08 3.716e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.53666 (-1.72308 2.2781)
R1^2/D10^2 : 1.37009 (-0.908898 1.8168)
kT2 [keV] : 35.4795 (-10.9245 32.0077)
R2^2/D10^2 : 5.45684E-03 (-0.00440857 0.0118389)
------------------------------------------------------------
# Chi-Squared = 49.41 using 59 PHA bins.
# Reduced chi-squared = 0.8984 for 55 degrees of freedom
# Null hypothesis probability = 6.871866e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.674e-09 5.362e-09
25- 50 1.674e-08 8.796e-09
50-150 5.306e-08 2.957e-08
15-150 7.948e-08 3.836e-08
Plot creation:
Fri Nov 25 18:47:50 EST 2011