batgrbproduct Analysis for Trigger=324362
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): Wed Jul 27 13:53:11 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger324362/SDC
======================================================================
Trigger: 00324362 Segment: 000
BAT Trigger Time: 242743944.768 [s; MET]
Trigger Stop: 242743945.024 [s; MET]
UTC: 2008-09-10T12:52:21.681120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 40.0742204874772 Dec: 61.2573991245877 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 9.64
Image Trigger?: NO
Rate S/N Ratio: 12.9614813968157 [ if not an image trigger ]
Image S/N Ratio: 9.64
Flight Position: [ source = BAT ]
RA: 40.0742204874772 Dec: 61.2573991245877 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 40.1003776298077 Dec: 61.2041177007333 [deg; J2000]
{ 02h 40m 24.1s , +61d 12' 14.8" }
+/- 2.2517641811867 [arcmin] (estimated 90% radius based on SNR)
+/- 1.31752336435221 [arcmin] (formal 1-sigma fit error)
SNR: 9.53924993603842
Angular difference between Flight and Ground position is 3.284907 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.23199999332428 +/- 0.0344092876538244
Measured from: 0.0439999997615814
to: 0.275999993085861 [s; relative to TRIGTIME]
T50: 0.148000001907349 +/- 0.0590593190784859
Measured from: 0.0920000076293945
to: 0.240000009536743 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.332000017166138
to: 0.667999982833862 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0320000052452087
to: 0.299999982118607 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.021387 0.020206 0.002692 0.001822
0.002761 0.002724 0.002124 0.001780 [error]
Peak 0.012478 0.023795 0.005038 -0.000574
0.004729 0.004681 0.003925 0.003501 [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 5.84e-09 6.13e-09 4.55e-09 5.46e-09 1.86e-08 2.20e-08 erg/cm2
Error 1.12e-09 1.17e-09 1.58e-09 3.43e-09 3.93e-09 5.97e-09 erg/cm2
Peak flux Power-law 1.44e-01 1.15e-01 6.24e-02 4.93e-02 3.44e-01 3.71e-01 ph/cm2/s
Error 5.77e-02 3.48e-02 2.93e-02 4.39e-02 1.03e-01 1.15e-01 ph/cm2/s
Fluence Cutoff-PL 5.47e-09 8.66e-09 1.58e-09 8.93e-12 1.57e-08 1.57e-08 erg/cm2
Error 1.31e-09 1.78e-09 1.78e-09 1.18e-10 2.95e-09 2.95e-09 erg/cm2
Peak flux Cutoff-PL 1.05e-01 1.61e-01 5.24e-02 1.73e-03 3.20e-01 3.20e-01 ph/cm2/s
Error 8.87e-02 4.25e-02 3.92e-02 1.69e-02 1.03e-01 1.03e-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 2.431 0.315 - - 7.07e-03 1.86e-03 69.190 57
CPL -1.721 3.014 29.1 4.4 4.13e+00 1.18e+03 55.210 56
The chi2 of BB fit is 55.22 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 1.886 0.521 - - 2.41e-03 8.91e-04 50.040 57
CPL -1.207 5.169 41.5 19.2 1.57e-01 1.84e+03 46.400 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 0.268 0.032 0.300
T90 0.232 0.044 0.276
T50 0.148 0.092 0.240
Peak 1.000 -0.332 0.668
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
40.1004 +61.2041 0.0202 6.4 -30.7 0.0466 9.5 TRIG_00324362
------------------------------------------
Foreground time interval of the image:
0.032 0.300 (delta_t = 0.268 [sec])
Background time interval of the image:
-10.768 0.032 (delta_t = 10.800 [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 0.032 sec. to 0.300 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.43075 ( -0.295258 0.334763 )
Norm@50keV : 7.06598E-03 ( -0.00184854 0.00186478 )
------------------------------------------------------------
# Chi-Squared = 69.19 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 57 degrees of freedom
# Null hypothesis probability = 1.290575e-01
Photon flux (15-150 keV) in 0.268 sec: 1.33135 ( -0.224094 0.224401 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.86116e-08 ( -3.83213e-09 4.02571e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.032 sec. to 0.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.72148 ( -3.98334 2.04395 )
Epeak [keV] : 29.1129 ( -4.41081 4.29837 )
Norm@50keV : 4.12991 ( -4.65227 2363.3 )
------------------------------------------------------------
# Chi-Squared = 55.21 using 59 PHA bins.
# Reduced chi-squared = 0.9858 for 56 degrees of freedom
# Null hypothesis probability = 5.049172e-01
Photon flux (15-150 keV) in 0.268 sec: 1.30889 ( -0.21515 0.21582 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57224e-08 ( -2.82644e-09 3.08136e-09 ) ergs/cm2
Band function
Time interval is from 0.032 sec. to 0.300 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.23166 ( -2.44142 -2.32094 )
beta : -9.99842 ( 2005.71 2015.7 )
Epeak [keV] : 29.1974 ( -4.48877 4.15259 )
Norm@50keV : 9.19361 ( -8.6235 314.044 )
------------------------------------------------------------
# Chi-Squared = 55.14 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 55 degrees of freedom
# Null hypothesis probability = 4.692925e-01
Photon flux (15-150 keV) in 0.268 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] : 7.46282 (-0.997896 1.13451)
R^2/D10^2 : 2.17271 (-0.963306 1.72676)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 55.22 using 59 PHA bins.
# Reduced chi-squared = 0.9688 for 57 degrees of freedom
# Null hypothesis probability = 5.421289e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.541e-09 1.577e-09
25- 50 8.564e-09 2.006e-09
50-150 1.779e-09 9.026e-10
15-150 1.588e-08 4.248e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 31.3921 (-8.79303 13.5988)
Norm : 10.7623 (-2.84112 3.94578)
------------------------------------------------------------
# Chi-Squared = 61.74 using 59 PHA bins.
# Reduced chi-squared = 1.083 for 57 degrees of freedom
# Null hypothesis probability = 3.104497e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.004e-09 1.309e-09
25- 50 7.031e-09 1.767e-09
50-150 4.083e-09 2.421e-09
15-150 1.712e-08 4.268e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.46261 (-7.4626 -7.4626)
R1^2/D10^2 : 0.341631 (-0.341657 -0.341657)
kT2 [keV] : 7.46292 (-7.46283 188.722)
R2^2/D10^2 : 1.83101 (-1.83104 -1.83104)
------------------------------------------------------------
# Chi-Squared = 55.22 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Null hypothesis probability = 4.663005e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.541e-09 1.065e+00
25- 50 8.564e-09 8.935e+00
50-150 1.779e-09 2.159e+02
15-150 1.588e-08 2.337e+02
Peak spectrum fit
Power-law model
Time interval is from -0.332 sec. to 0.668 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88638 ( -0.484201 0.557099 )
Norm@50keV : 2.41178E-03 ( -0.000905651 0.000875437 )
------------------------------------------------------------
# Chi-Squared = 50.04 using 59 PHA bins.
# Reduced chi-squared = 0.8779 for 57 degrees of freedom
# Null hypothesis probability = 7.314413e-01
Photon flux (15-150 keV) in 1 sec: 0.344131 ( -0.103476 0.103482 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.21674e-08 ( -7.85026e-09 8.3865e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.332 sec. to 0.668 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.20693 ( -7.5132 2.82492 )
Epeak [keV] : 41.5316 ( -11.3627 27.0968 )
Norm@50keV : 0.156863 ( -0.188263 3686.64 )
------------------------------------------------------------
# Chi-Squared = 46.40 using 59 PHA bins.
# Reduced chi-squared = 0.8286 for 56 degrees of freedom
# Null hypothesis probability = 8.161792e-01
Photon flux (15-150 keV) in 1 sec: 0.320354 ( -0.101923 0.103613 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81222e-08 ( -6.0514e-09 7.8102e-09 ) ergs/cm2
Band function
Time interval is from -0.332 sec. to 0.668 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.62009 ( -2.0879 -1.62009 )
beta : -9.26935 ( 8.35449 18.3494 )
Epeak [keV] : 41.1860 ( -10.6267 22.9444 )
Norm@50keV : 0.272237 ( -0.27276 53.4259 )
------------------------------------------------------------
# Chi-Squared = 46.37 using 59 PHA bins.
# Reduced chi-squared = 0.8431 for 55 degrees of freedom
# Null hypothesis probability = 7.897499e-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] : 10.5873 (-2.49184 3.29721)
R^2/D10^2 : 0.145798 (-0.145798 0.24776)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 46.34 using 59 PHA bins.
# Reduced chi-squared = 0.8130 for 57 degrees of freedom
# Null hypothesis probability = 8.425799e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.385e-09 2.080e-09
25- 50 9.104e-09 5.480e-09
50-150 5.592e-09 4.152e-09
15-150 1.808e-08 1.150e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 69.6302 (-37.1186 -69.7265)
Norm : 1.74303 (-0.589409 0.957758)
------------------------------------------------------------
# Chi-Squared = 48.57 using 59 PHA bins.
# Reduced chi-squared = 0.8521 for 57 degrees of freedom
# Null hypothesis probability = 7.790189e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.469e-09 2.793e-09
25- 50 7.101e-09 4.356e-09
50-150 9.084e-09 7.610e-09
15-150 2.065e-08 1.425e-08
Double BB
R1^2/D10^2 : 9.77123E+07 ( )
kT2 [keV] : 10.7620 (-2.56998 3.44828)
R2^2/D10^2 : 0.135446 (-0.0896063 0.240455)
------------------------------------------------------------
# Chi-Squared = 46.34 using 59 PHA bins.
# Chi-Squared = 46.12 using 59 PHA bins.
# Chi-Squared = 46.09 using 59 PHA bins.
# Reduced chi-squared = 0.8425 for 55 degrees of freedom
# Reduced chi-squared = 0.8386 for 55 degrees of freedom
# Reduced chi-squared = 0.8381 for 55 degrees of freedom
# Null hypothesis probability = 7.907986e-01
# Null hypothesis probability = 7.973347e-01
# Null hypothesis probability = 7.982212e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Wed Jul 27 14:10:22 EDT 2011