batgrbproduct Analysis for Trigger=538575
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 16 18:12:12 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger538575/GCN5_download_cron
======================================================================
Trigger: 00538575 Segment: 000
BAT Trigger Time: 374725656 [s; MET]
Trigger Stop: 374725720 [s; MET]
UTC: 2012-11-16T02:27:26.121660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 345.792644979001 Dec: -40.746083625426 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.13
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.13
Flight Position: [ source = BAT ]
RA: 345.792644979001 Dec: -40.746083625426 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 345.815846590151 Dec: -40.7586673335503 [deg; J2000]
{ 23h 03m 15.8s , -40d 45' 31.2" }
+/- 3.81037472435749 [arcmin] (estimated 90% radius based on SNR)
+/- 1.96929418634536 [arcmin] (formal 1-sigma fit error)
SNR: 4.49950294547395
Angular difference between Flight and Ground position is 1.296984 arcmin
Partial Coding Fraction: 0.2695312 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.262409 0.471488 -0.017928 0.056529
0.101751 0.103860 0.089814 0.077613 [error]
Peak 0.262409 0.471488 -0.017928 0.056529
0.101751 0.103860 0.089814 0.077613 [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 1.34e-07 1.42e-07 1.07e-07 1.30e-07 4.33e-07 5.13e-07 erg/cm2
Error 5.93e-08 5.60e-08 7.43e-08 1.98e-07 1.86e-07 2.95e-07 erg/cm2
Peak flux Power-law 6.88e-02 4.06e-02 1.53e-02 7.63e-03 1.29e-01 1.32e-01 ph/cm2/s
Error 3.11e-02 1.56e-02 1.03e-02 1.07e-02 4.68e-02 4.83e-02 ph/cm2/s
Fluence Cutoff-PL 9.85e-08 2.25e-07 2.10e-08 4.96e-12 3.44e-07 0.00e+00 erg/cm2
Error 6.83e-08 8.99e-08 4.81e-08 3.95e-09 1.26e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.72e-02 6.57e-02 3.64e-03 4.62e-07 1.16e-01 1.16e-01 ph/cm2/s
Error 3.48e-02 2.53e-02 7.50e-03 3.33e-04 4.45e-02 4.45e-02 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 2.413 0.726 - - 6.91e-04 3.64e-04 67.410 57
CPL -6.083 0.000 31.1 6.7 2.33e+02 0.00e+00 62.260 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.413 0.726 - - 6.91e-04 3.64e-04 67.410 57
CPL -6.083 0.000 31.1 6.7 2.33e+02 0.00e+00 62.260 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
345.8158 -40.7587 0.0425 50.1 -13.0 0.9220 4.5 TRIG_00538575
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.41293 ( -0.645436 0.806036 )
Norm@50keV : 6.90595E-04 ( -0.000362394 0.00036656 )
------------------------------------------------------------
# Chi-Squared = 67.41 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 57 degrees of freedom
# Null hypothesis probability = 1.628620e-01
Photon flux (15-150 keV) in 64 sec: 0.128749 ( -0.0468302 0.0468345 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.32574e-07 ( -1.78281e-07 1.94562e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.08257 ( )
Epeak [keV] : 31.1447 ( -6.68082 6.76092 )
Norm@50keV : 233.136 ( )
------------------------------------------------------------
# Chi-Squared = 62.26 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 56 degrees of freedom
# Null hypothesis probability = 2.632066e-01
Photon flux (15-150 keV) in 64 sec: 0.116461 ( -0.0429708 0.046097 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.44452e-07 ( -1.21483e-07 1.31391e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96311 ( -63.7582 -53.7588 )
beta : -9.37167 ( 10 19.8164 )
Epeak [keV] : 30.9469 ( -5.81004 6.5457 )
Norm@50keV : 45.0570 ( -45.0603 298.979 )
------------------------------------------------------------
# Chi-Squared = 62.31 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 55 degrees of freedom
# Null hypothesis probability = 2.323955e-01
Photon flux (15-150 keV) in 64 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] : 7.55647 (-1.82953 2.34906)
R^2/D10^2 : 0.199481 (-0.199655 0.430593)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 63.16 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 57 degrees of freedom
# Null hypothesis probability = 2.679437e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.259e-07 7.766e-08
25- 50 1.991e-07 1.228e-07
50-150 4.318e-08 3.760e-08
15-150 3.682e-07 2.310e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 29.8811 (-14.4192 43.7454)
Norm : 1.07525 (-0.552783 1.14521)
------------------------------------------------------------
# Chi-Squared = 65.87 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 57 degrees of freedom
# Null hypothesis probability = 1.967816e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.398e-07 8.656e-08
25- 50 1.594e-07 9.773e-08
50-150 8.682e-08 7.853e-08
15-150 3.860e-07 2.473e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.998 ( )
R1^2/D10^2 : 7.80612E-06 (-7.79083e-06 1.13795e-05)
kT2 [keV] : 7.25933 (-1.79224 2.25478)
R2^2/D10^2 : 0.227189 (-0.15531 0.505796)
------------------------------------------------------------
# Chi-Squared = 63.16 using 59 PHA bins.
# Chi-Squared = 61.90 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 55 degrees of freedom
# Reduced chi-squared = 1.126 for 55 degrees of freedom
# Null hypothesis probability = 2.103609e-01
# Null hypothesis probability = 2.433771e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.258e-07 4.288e+00
25- 50 1.992e-07 3.046e+01
50-150 4.330e-08 8.608e+02
15-150 3.683e-07 8.893e+02
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.41293 ( -0.645436 0.806036 )
Norm@50keV : 6.90595E-04 ( -0.000362394 0.00036656 )
------------------------------------------------------------
# Chi-Squared = 67.41 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 57 degrees of freedom
# Null hypothesis probability = 1.628620e-01
Photon flux (15-150 keV) in 64 sec: 0.128749 ( -0.0468302 0.0468345 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.32574e-07 ( -1.78281e-07 1.94562e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.08257 ( )
Epeak [keV] : 31.1447 ( -6.68082 6.76092 )
Norm@50keV : 233.136 ( )
------------------------------------------------------------
# Chi-Squared = 62.26 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 56 degrees of freedom
# Null hypothesis probability = 2.632066e-01
Photon flux (15-150 keV) in 64 sec: 0.116461 ( -0.0429708 0.046097 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.44452e-07 ( -1.21483e-07 1.31391e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96311 ( -63.7582 -53.7588 )
beta : -9.37167 ( 10 19.8164 )
Epeak [keV] : 30.9469 ( -5.81004 6.5457 )
Norm@50keV : 45.0570 ( -45.0603 298.979 )
------------------------------------------------------------
# Chi-Squared = 62.31 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 55 degrees of freedom
# Null hypothesis probability = 2.323955e-01
Photon flux (15-150 keV) in 64 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] : 7.55647 (-1.82953 2.34906)
R^2/D10^2 : 0.199481 (-0.199655 0.430593)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 63.16 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 57 degrees of freedom
# Null hypothesis probability = 2.679437e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.259e-07 7.693e-08
25- 50 1.991e-07 1.226e-07
50-150 4.318e-08 3.360e-08
15-150 3.682e-07 2.279e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 29.8811 (-14.4192 43.7454)
Norm : 1.07525 (-0.552783 1.14521)
------------------------------------------------------------
# Chi-Squared = 65.87 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 57 degrees of freedom
# Null hypothesis probability = 1.967816e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.398e-07 8.613e-08
25- 50 1.594e-07 1.049e-07
50-150 8.682e-08 7.686e-08
15-150 3.860e-07 2.514e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.998 ( )
R1^2/D10^2 : 7.80612E-06 (-7.79083e-06 1.13795e-05)
kT2 [keV] : 7.25933 (-1.79224 2.25478)
R2^2/D10^2 : 0.227189 (-0.15531 0.505796)
------------------------------------------------------------
# Chi-Squared = 63.16 using 59 PHA bins.
# Chi-Squared = 61.90 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 55 degrees of freedom
# Reduced chi-squared = 1.126 for 55 degrees of freedom
# Null hypothesis probability = 2.103609e-01
# Null hypothesis probability = 2.433771e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.258e-07 3.958e+00
25- 50 1.992e-07 3.456e+01
50-150 4.330e-08 7.533e+02
15-150 3.683e-07 8.915e+02
Plot creation:
Fri Nov 16 18:39:04 EST 2012