batgrbproduct Analysis for Trigger=506902
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 4 03:31:47 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger506902/GCN5_download_cron
======================================================================
Trigger: 00506902 Segment: 000
BAT Trigger Time: 342009321.024 [s; MET]
Trigger Stop: 342009322.048 [s; MET]
UTC: 2011-11-03T10:35:13.489780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 327.121853512217 Dec: -10.5472597757318 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.23
Image Trigger?: NO
Rate S/N Ratio: 37.5765884561119 [ if not an image trigger ]
Image S/N Ratio: 12.23
Flight Position: [ source = BAT ]
RA: 327.121853512217 Dec: -10.5472597757318 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 327.111059238043 Dec: -10.5317410617411 [deg; J2000]
{ 21h 48m 26.7s , -10d 31' 54.3" }
+/- 1.13749543752321 [arcmin] (estimated 90% radius based on SNR)
+/- 0.331627889914499 [arcmin] (formal 1-sigma fit error)
SNR: 25.3040647046977
Angular difference between Flight and Ground position is 1.128014 arcmin
Partial Coding Fraction: 0.3164062 [ including projection effects ]
Duration
T90: 11.6199999451637 +/- 0.459999990463258
Measured from: -0.0159998536109924
to: 11.6040000915527 [s; relative to TRIGTIME]
T50: 7.07199996709824 +/- 2.1141391036802
Measured from: 1.08800011873245
to: 8.16000008583069 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.04000002145767
to: 7.04000002145767 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.416000008583069
to: 12.1399999856949 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.461112 0.769318 0.658234 0.199839
0.038863 0.041148 0.037392 0.031434 [error]
Peak 0.067787 0.156709 0.130707 0.040031
0.012076 0.014102 0.012415 0.010009 [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 1.48e-07 3.09e-07 5.02e-07 1.84e-06 1.39e-06 2.80e-06 erg/cm2
Error 1.64e-08 2.05e-08 3.58e-08 2.91e-07 8.98e-08 3.13e-07 erg/cm2
Peak flux Power-law 8.07e-01 9.84e-01 8.71e-01 1.33e+00 3.12e+00 3.99e+00 ph/cm2/s
Error 1.50e-01 1.15e-01 9.63e-02 3.01e-01 3.19e-01 4.14e-01 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 6.85e-01 1.05e+00 9.47e-01 3.05e+00 3.30e+00 0.00e+00 ph/cm2/s
Error 1.80e-01 1.37e-01 1.19e-01 3.28e-01 5.28e-01 0.00e+00 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 1.297 0.103 - - 1.12e-02 6.57e-04 60.790 57
CPL 0.965 0.406 165.1 -49.8 1.62e-02 7.51e-03 58.790 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.177 0.161 - - 2.67e-02 2.64e-03 50.680 57
CPL 0.378 0.764 107.9 166.4 6.49e-02 6.42e-02 46.750 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: 11.584000 sec.
T50 in the 50-300 keV band: 6.976000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 12.556 -0.416 12.140
T90 11.620 -0.016 11.604
T50 7.072 1.088 8.160
Peak 1.000 6.040 7.040
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
327.1111 -10.5317 0.0076 31.6 101.5 2.2687 25.3 TRIG_00506902
------------------------------------------
Foreground time interval of the image:
-0.416 12.140 (delta_t = 12.556 [sec])
Background time interval of the image:
-109.723 -0.416 (delta_t = 109.307 [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 -0.416 sec. to 12.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29736 ( -0.103012 0.102361 )
Norm@50keV : 1.11793E-02 ( -0.000657501 0.000657433 )
------------------------------------------------------------
# Chi-Squared = 60.79 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 57 degrees of freedom
# Null hypothesis probability = 3.409520e-01
Photon flux (15-150 keV) in 12.56 sec: 1.33308 ( -0.0814895 0.0816123 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38842e-06 ( -8.95762e-08 8.99375e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.416 sec. to 12.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.965203 ( -0.439323 0.373227 )
Epeak [keV] : 165.073 ( -65.5642 -165.075 )
Norm@50keV : 1.61633E-02 ( -0.00526966 0.00975291 )
------------------------------------------------------------
# Chi-Squared = 58.79 using 59 PHA bins.
# Reduced chi-squared = 1.050 for 56 degrees of freedom
# Null hypothesis probability = 3.737163e-01
Photon flux (15-150 keV) in 12.56 sec: 1.31354 ( -0.08485 0.08482 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.416 sec. to 12.140 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98744 ( -164.023 -154.023 )
beta : -1.36494 ( -0.116871 0.114741 )
Epeak [keV] : 25.7363 ( -6.01721 5.08925 )
Norm@50keV : 814.696 ( -814.696 16069.9 )
------------------------------------------------------------
# Chi-Squared = 57.02 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 55 degrees of freedom
# Null hypothesis probability = 3.999652e-01
Photon flux (15-150 keV) in 12.56 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] : 17.5299 (-1.32102 1.46123)
R^2/D10^2 : 9.24741E-02 (-0.0220694 0.0283893)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 110.63 using 59 PHA bins.
# Reduced chi-squared = 1.9408 for 57 degrees of freedom
# Null hypothesis probability = 2.702927e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.205e-08 8.535e-09
25- 50 3.266e-07 2.506e-08
50-150 7.232e-07 8.120e-08
15-150 1.122e-06 8.239e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.995 ( )
Norm : 5.56046 (-5.56046 -5.56046)
------------------------------------------------------------
# Chi-Squared = 76.10 using 59 PHA bins.
# Reduced chi-squared = 1.335 for 57 degrees of freedom
# Null hypothesis probability = 4.633063e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.739e-07 9.031e-08
25- 50 3.346e-07 1.729e-07
50-150 7.338e-07 3.796e-07
15-150 1.242e-06 6.456e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.50305 (-1.93238 2.29361)
R1^2/D10^2 : 0.645635 (-0.31441 0.778056)
kT2 [keV] : 31.9274 (-7.11027 18.5391)
R2^2/D10^2 : 9.79051E-03 (-0.00737318 0.0140619)
------------------------------------------------------------
# Chi-Squared = 58.84 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 55 degrees of freedom
# Null hypothesis probability = 3.369221e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.294e-07 3.762e-08
25- 50 3.337e-07 6.914e-08
50-150 9.043e-07 3.849e-07
15-150 1.367e-06 4.542e-07
Peak spectrum fit
Power-law model
Time interval is from 6.040 sec. to 7.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17692 ( -0.162956 0.159717 )
Norm@50keV : 2.66963E-02 ( -0.00264387 0.00264313 )
------------------------------------------------------------
# Chi-Squared = 50.68 using 59 PHA bins.
# Reduced chi-squared = 0.8892 for 57 degrees of freedom
# Null hypothesis probability = 7.095325e-01
Photon flux (15-150 keV) in 1 sec: 3.12380 ( -0.319018 0.319609 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72641e-07 ( -2.91905e-08 2.93364e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.040 sec. to 7.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.377649 ( -0.834444 0.693903 )
Epeak [keV] : 107.920 ( -31.2371 301.61 )
Norm@50keV : 6.48785E-02 ( -0.0343454 0.0940261 )
------------------------------------------------------------
# Chi-Squared = 46.75 using 59 PHA bins.
# Reduced chi-squared = 0.8348 for 56 degrees of freedom
# Null hypothesis probability = 8.060806e-01
Photon flux (15-150 keV) in 1 sec: 3.04939 ( -0.32777 0.32729 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 6.040 sec. to 7.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.48320 ( -2.95513 -2.25786 )
beta : -1.45445 ( -1.17933 0.268404 )
Epeak [keV] : 41.8141 ( -12.367 100.57 )
Norm@50keV : 5.14659 ( -5.11071 160.167 )
------------------------------------------------------------
# Chi-Squared = 45.16 using 59 PHA bins.
# Reduced chi-squared = 0.8211 for 55 degrees of freedom
# Null hypothesis probability = 8.253570e-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] : 18.1852 (-2.08444 2.46897)
R^2/D10^2 : 0.203988 (-0.0712491 0.103992)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 57.27 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 57 degrees of freedom
# Null hypothesis probability = 4.650715e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.346e-08 2.660e-09
25- 50 6.273e-08 8.975e-09
50-150 1.510e-07 2.555e-08
15-150 2.272e-07 3.035e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.997 ( )
Norm : 12.9930 (-12.993 -12.993)
------------------------------------------------------------
# Chi-Squared = 62.95 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 57 degrees of freedom
# Null hypothesis probability = 2.739147e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.235e-08 1.746e-08
25- 50 6.224e-08 3.343e-08
50-150 1.365e-07 7.275e-08
15-150 2.311e-07 1.231e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.1889 (-4.49672 3.88603)
R1^2/D10^2 : 0.558097 (-0.30912 1.21009)
kT2 [keV] : 50.6466 (-23.3427 -46.7593)
R2^2/D10^2 : 5.13784E-03 ( )
------------------------------------------------------------
# Chi-Squared = 45.18 using 59 PHA bins.
# Chi-Squared = 45.15 using 59 PHA bins.
# Reduced chi-squared = 0.8214 for 55 degrees of freedom
# Reduced chi-squared = 0.8209 for 55 degrees of freedom
# Null hypothesis probability = 8.249449e-01
# Null hypothesis probability = 8.257832e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.925e-08 9.058e-09
25- 50 6.634e-08 2.835e-08
50-150 1.789e-07 9.442e-08
15-150 2.645e-07 1.244e-07
Plot creation:
Fri Nov 4 03:48:58 EDT 2011