batgrbproduct Analysis for Trigger=538084
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): Sun Nov 11 23:07:07 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger538084/GCN5_download_cron
======================================================================
Trigger: 00538084 Segment: 000
BAT Trigger Time: 374319312 [s; MET]
Trigger Stop: 374319632 [s; MET]
UTC: 2012-11-11T09:35:02.139000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 264.873112268083 Dec: -30.3601539350677 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.1
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.1
Flight Position: [ source = BAT ]
RA: 264.873112268083 Dec: -30.3601539350677 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 264.80820383816 Dec: -30.3392057584255 [deg; J2000]
{ 17h 39m 14.0s , -30d 20' 21.1" }
+/- 2.64633670686985 [arcmin] (estimated 90% radius based on SNR)
+/- 1.71180988025856 [arcmin] (formal 1-sigma fit error)
SNR: 7.57425050364988
Angular difference between Flight and Ground position is 3.588135 arcmin
Partial Coding Fraction: 0.7578125 [ including projection effects ]
Duration
T90: 545.907999932766 +/- 99.0734051590944
Measured from: -21.0199998617172
to: 524.888000071049 [s; relative to TRIGTIME]
T50: 254.927999973297 +/- 105.889596696563
Measured from: 103.812000095844
to: 358.740000069141 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -23.3000000119209
to: -22.3000000119209 [s; relative to TRIGTIME]
Total Fluence
Measured from: -38.9359999895096
to: 553.995999991894 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.473162 1.308338 0.269685 0.054482
0.179897 0.166358 0.139707 0.121427 [error]
Peak 0.021053 0.015812 0.012343 0.003173
0.007960 0.007396 0.006046 0.005531 [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 4.28e-07 4.76e-07 3.79e-07 4.99e-07 1.47e-06 1.78e-06 erg/cm2
Error 8.19e-08 8.03e-08 1.15e-07 2.84e-07 2.80e-07 4.51e-07 erg/cm2
Peak flux Power-law 1.92e-01 1.54e-01 8.36e-02 6.61e-02 4.60e-01 4.96e-01 ph/cm2/s
Error 1.17e-01 6.08e-02 6.88e-02 9.69e-02 1.82e-01 1.98e-01 ph/cm2/s
Fluence Cutoff-PL 4.04e-07 6.06e-07 1.90e-07 5.95e-09 1.21e-06 0.00e+00 erg/cm2
Error 9.20e-08 1.13e-07 1.44e-07 3.66e-08 2.24e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.92e-01 1.54e-01 8.35e-02 6.56e-02 4.60e-01 5.01e-01 ph/cm2/s
Error 1.16e-01 6.08e-02 5.40e-02 9.58e-02 1.82e-01 1.97e-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 2.330 0.293 - - 2.58e-04 5.87e-05 66.080 57
CPL -0.551 2.217 29.3 5.3 2.04e-02 0.00e+00 56.810 56
The chi2 of BB fit is 57.53 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 1.885 0.884 - - 3.23e-03 1.60e-03 37.370 57
CPL 1.887 3.171 523.7 0.0 3.25e-03 0.00e+00 37.370 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 592.932 -38.936 553.996
T90 545.908 -21.020 524.888
T50 254.928 103.812 358.740
Peak 1.000 -23.300 -22.300
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
264.8082 -30.3392 0.0255 24.3 -130.6 3.0359 7.6 TRIG_00538084
------------------------------------------
Foreground time interval of the image:
-11.899 529.201 (delta_t = 541.100 [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 -38.936 sec. to 553.996 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.33009 ( -0.28077 0.305643 )
Norm@50keV : 2.57572E-04 ( -5.86904e-05 5.86888e-05 )
------------------------------------------------------------
# Chi-Squared = 66.08 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 57 degrees of freedom
# Null hypothesis probability = 1.920386e-01
Photon flux (15-150 keV) in 592.9 sec: 4.57785E-02 ( -0.00716326 0.00716353 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4674e-06 ( -2.73884e-07 2.85882e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -38.936 sec. to 553.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.550994 ( -2.82734 1.60597 )
Epeak [keV] : 29.2714 ( -4.91307 5.69519 )
Norm@50keV : 2.03859E-02 ( )
------------------------------------------------------------
# Chi-Squared = 56.81 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 56 degrees of freedom
# Null hypothesis probability = 4.448449e-01
Photon flux (15-150 keV) in 592.9 sec: 4.38519E-02 ( -0.0069485 0.006991 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20579e-06 ( -2.18952e-07 2.2934e-07 ) ergs/cm2
Band function
Time interval is from -38.936 sec. to 553.996 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96829 ( -72.2189 -62.2195 )
beta : -3.00833 ( -1.12657 0.559621 )
Epeak [keV] : 24.3404 ( -4.08512 4.24704 )
Norm@50keV : 71.0803 ( -71.0803 24.3282 )
------------------------------------------------------------
# Chi-Squared = 55.94 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 55 degrees of freedom
# Null hypothesis probability = 4.394662e-01
Photon flux (15-150 keV) in 592.9 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] : 7.61816 (-1.07915 1.25416)
R^2/D10^2 : 6.49056E-02 (-0.0303887 0.0571038)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 57.53 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.554592e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.885e-07 9.973e-08
25- 50 6.235e-07 1.662e-07
50-150 1.390e-07 6.652e-08
15-150 1.151e-06 2.665e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.8679 (-9.88815 16.0463)
Norm : 0.334672 (-0.0866009 0.119419)
------------------------------------------------------------
# Chi-Squared = 59.98 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 57 degrees of freedom
# Null hypothesis probability = 3.682086e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.328e-07 8.404e-08
25- 50 5.347e-07 1.258e-07
50-150 3.535e-07 1.836e-07
15-150 1.321e-06 3.382e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.64710 (-5.67201 -5.67201)
R1^2/D10^2 : 0.126904 (-0.1257 1.00618)
kT2 [keV] : 10.6988 (-10.865 -10.865)
R2^2/D10^2 : 8.75738E-03 (-0.00784033 0.0965909)
------------------------------------------------------------
# Chi-Squared = 56.37 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 55 degrees of freedom
# Null hypothesis probability = 4.234569e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.141e-07 3.056e-07
25- 50 5.899e-07 5.229e-07
50-150 2.309e-07 1.685e-07
15-150 1.235e-06 9.104e-07
Peak spectrum fit
Power-law model
Time interval is from -23.300 sec. to -22.300 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88515 ( -0.78659 0.980679 )
Norm@50keV : 3.22558E-03 ( -0.00171237 0.00149601 )
------------------------------------------------------------
# Chi-Squared = 37.37 using 59 PHA bins.
# Reduced chi-squared = 0.6557 for 57 degrees of freedom
# Null hypothesis probability = 9.793712e-01
Photon flux (15-150 keV) in 1 sec: 0.460013 ( -0.182133 0.1823 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96525e-08 ( -1.37813e-08 1.46615e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -23.300 sec. to -22.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88746 ( -3.12577 3.21543 )
Epeak [keV] : 523.684 ( )
Norm@50keV : 3.25205E-03 ( )
------------------------------------------------------------
# Chi-Squared = 37.37 using 59 PHA bins.
# Reduced chi-squared = 0.6674 for 56 degrees of freedom
# Null hypothesis probability = 9.737995e-01
Photon flux (15-150 keV) in 1 sec: 0.459937 ( -0.181065 0.182047 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.25245e-08 ( -2.81034e-08 4.38782e-08 ) ergs/cm2
Band function
Time interval is from -23.300 sec. to -22.300 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.63922 ( 1.6469 1.6469 )
beta : -1.88230 ( 1.88497 0.785678 )
Epeak [keV] : 23.5951 ( -22.3136 -22.3136 )
Norm@50keV : 5.45212E-03 ( -0.005474 0.0955035 )
------------------------------------------------------------
# Chi-Squared = 37.37 using 59 PHA bins.
# Reduced chi-squared = 0.6795 for 55 degrees of freedom
# Null hypothesis probability = 9.669835e-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] : 11.8529 (-6.20456 11.289)
R^2/D10^2 : 0.108595 (-0.10494 1.64684)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 40.36 using 59 PHA bins.
# Reduced chi-squared = 0.7081 for 57 degrees of freedom
# Null hypothesis probability = 9.533652e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.223e-09 2.104e-09
25- 50 9.997e-09 6.750e-09
50-150 8.375e-09 6.080e-09
15-150 2.159e-08 1.400e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 97.4503 (-97.4568 -97.4568)
Norm : 2.01207 (-0.905803 2.31162)
------------------------------------------------------------
# Chi-Squared = 37.73 using 59 PHA bins.
# Reduced chi-squared = 0.6619 for 57 degrees of freedom
# Null hypothesis probability = 9.770760e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.258e-09 3.442e-09
25- 50 9.045e-09 5.730e-09
50-150 1.444e-08 1.213e-08
15-150 2.875e-08 2.009e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.84263 (-2.28846 10.0442)
R1^2/D10^2 : 35.3390 (-35.1474 209.861)
kT2 [keV] : 17.3321 (-8.76915 -17.3392)
R2^2/D10^2 : 2.42128E-02 (-0.0240053 0.300982)
------------------------------------------------------------
# Chi-Squared = 37.19 using 59 PHA bins.
# Reduced chi-squared = 0.6763 for 55 degrees of freedom
# Null hypothesis probability = 9.685818e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.164e-09 3.349e-09
25- 50 7.183e-09 4.462e-09
50-150 1.428e-08 1.058e-08
15-150 2.763e-08 1.693e-08
Plot creation:
Sun Nov 11 23:41:03 EST 2012