batgrbproduct Analysis for Trigger=531267
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): Sat Aug 18 08:19:46 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger531267/GCN5_download_cron
======================================================================
Trigger: 00531267 Segment: 000
BAT Trigger Time: 366878992.384 [s; MET]
Trigger Stop: 366878993.408 [s; MET]
UTC: 2012-08-17T06:49:42.837740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 250.705914335871 Dec: -38.3405242211228 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.78
Image Trigger?: NO
Rate S/N Ratio: 15.8429795177549 [ if not an image trigger ]
Image S/N Ratio: 7.78
Flight Position: [ source = BAT ]
RA: 250.705914335871 Dec: -38.3405242211228 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 250.692339331636 Dec: -38.3768904061274 [deg; J2000]
{ 16h 42m 46.2s , -38d 22' 36.8" }
+/- 1.50448911719824 [arcmin] (estimated 90% radius based on SNR)
+/- 0.71325111133343 [arcmin] (formal 1-sigma fit error)
SNR: 16.9709225142375
Angular difference between Flight and Ground position is 2.273525 arcmin
Partial Coding Fraction: 0.859375 [ including projection effects ]
Duration
T90: 28.1839999556541 +/- 6.80257951587017
Measured from: -1.51199990510941
to: 26.6720000505447 [s; relative to TRIGTIME]
T50: 11.8959999084473 +/- 1.36718688068485
Measured from: 1.44800013303757
to: 13.3440000414848 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.11599999666214
to: 0.88400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.24400001764297
to: 30.772000014782 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.484440 0.510160 0.258610 0.047989
0.037087 0.033814 0.027870 0.023072 [error]
Peak 0.022660 0.046193 0.030943 0.009477
0.006785 0.006496 0.005352 0.004140 [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 1.49e-07 2.06e-07 2.10e-07 3.91e-07 6.91e-07 9.57e-07 erg/cm2
Error 1.85e-08 1.62e-08 2.77e-08 1.06e-07 6.27e-08 1.32e-07 erg/cm2
Peak flux Power-law 2.43e-01 2.71e-01 2.16e-01 2.85e-01 8.36e-01 1.02e+00 ph/cm2/s
Error 7.70e-02 5.36e-02 4.30e-02 1.17e-01 1.50e-01 1.78e-01 ph/cm2/s
Fluence Cutoff-PL 1.46e-07 2.10e-07 2.10e-07 2.83e-07 8.49e-07 0.00e+00 erg/cm2
Error 1.86e-08 2.04e-08 2.88e-08 1.96e-07 2.18e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.01e-01 2.94e-01 2.33e-01 1.12e-01 8.03e-01 8.41e-01 ph/cm2/s
Error 7.07e-02 6.61e-02 5.11e-02 1.57e-01 1.63e-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 1.971 0.156 - - 2.27e-03 2.14e-04 63.210 57
CPL 1.790 0.540 51.4 0.0 2.86e-03 0.00e+00 62.950 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.328 0.289 - - 6.97e-03 1.20e-03 69.380 57
CPL 0.348 1.483 85.9 -30.0 2.13e-02 8.83e-02 67.660 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: 19.904000 sec.
T50 in the 50-300 keV band: 12.288000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 33.016 -2.244 30.772
T90 28.184 -1.512 26.672
T50 11.896 1.448 13.344
Peak 1.000 -0.116 0.884
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
250.6923 -38.3769 0.0114 19.6 -131.6 1.3479 17.0 TRIG_00531267
------------------------------------------
Foreground time interval of the image:
-2.244 30.772 (delta_t = 33.016 [sec])
Background time interval of the image:
-60.384 -2.244 (delta_t = 58.140 [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 -2.244 sec. to 30.772 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97133 ( -0.153719 0.15895 )
Norm@50keV : 2.27263E-03 ( -0.000215929 0.000212023 )
------------------------------------------------------------
# Chi-Squared = 63.21 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 57 degrees of freedom
# Null hypothesis probability = 2.664059e-01
Photon flux (15-150 keV) in 33.02 sec: 0.336479 ( -0.0270724 0.0271429 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.91109e-07 ( -6.2317e-08 6.31408e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.244 sec. to 30.772 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78976 ( -0.680624 0.399232 )
Epeak [keV] : 51.3841 ( )
Norm@50keV : 2.86030E-03 ( )
------------------------------------------------------------
# Chi-Squared = 62.95 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 56 degrees of freedom
# Null hypothesis probability = 2.438639e-01
Photon flux (15-150 keV) in 33.02 sec: 0.333054 ( -0.02932 0.029028 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.4938e-07 ( -1.99546e-07 2.36354e-07 ) ergs/cm2
Band function
Time interval is from -2.244 sec. to 30.772 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.67811 ( 1.68866 1.68866 )
beta : -2.16160 ( 2.14799 0.320116 )
Epeak [keV] : 46.3292 ( -46.7912 -46.7912 )
Norm@50keV : 3.32543E-03 ( -0.00111009 0 )
------------------------------------------------------------
# Chi-Squared = 62.86 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 55 degrees of freedom
# Null hypothesis probability = 2.178325e-01
Photon flux (15-150 keV) in 33.02 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] : 10.7470 (-1.01261 1.1304)
R^2/D10^2 : 0.114625 (-0.0366002 0.0533536)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 98.46 using 59 PHA bins.
# Reduced chi-squared = 1.727 for 57 degrees of freedom
# Null hypothesis probability = 5.393235e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.088e-08 1.329e-08
25- 50 2.493e-07 2.534e-08
50-150 1.597e-07 3.135e-08
15-150 4.999e-07 4.722e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 74.3809 (-17.381 26.9428)
Norm : 1.59236 (-0.202965 0.242756)
------------------------------------------------------------
# Chi-Squared = 64.40 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 57 degrees of freedom
# Null hypothesis probability = 2.337277e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.357e-07 1.502e-08
25- 50 2.194e-07 1.796e-08
50-150 2.945e-07 5.889e-08
15-150 6.495e-07 6.323e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.94941 (-1.95918 2.48309)
R1^2/D10^2 : 1.47877 (-1.09367 13.746)
kT2 [keV] : 17.1444 (-4.11601 11.4474)
R2^2/D10^2 : 1.51720E-02 (-0.0128222 0.0325676)
------------------------------------------------------------
# Chi-Squared = 67.56 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 55 degrees of freedom
# Null hypothesis probability = 1.191722e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.439e-07 6.710e-08
25- 50 2.059e-07 6.084e-08
50-150 2.832e-07 9.523e-08
15-150 6.330e-07 2.157e-07
Peak spectrum fit
Power-law model
Time interval is from -0.116 sec. to 0.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32819 ( -0.292564 0.286167 )
Norm@50keV : 6.96812E-03 ( -0.00119786 0.00119735 )
------------------------------------------------------------
# Chi-Squared = 69.38 using 59 PHA bins.
# Reduced chi-squared = 1.217 for 57 degrees of freedom
# Null hypothesis probability = 1.258884e-01
Photon flux (15-150 keV) in 1 sec: 0.835794 ( -0.149262 0.150031 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.8396e-08 ( -1.26479e-08 1.27892e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.116 sec. to 0.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.348147 ( -1.86356 1.10239 )
Epeak [keV] : 85.9183 ( -25.977 -85.9192 )
Norm@50keV : 2.12883E-02 ( -0.0212877 0.155322 )
------------------------------------------------------------
# Chi-Squared = 67.66 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 56 degrees of freedom
# Null hypothesis probability = 1.366383e-01
Photon flux (15-150 keV) in 1 sec: 0.802666 ( -0.156953 0.156558 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.93942e-08 ( -3.22743e-08 8.03858e-08 ) ergs/cm2
Band function
Time interval is from -0.116 sec. to 0.884 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.00341 ( -0.633486 -0.633486 )
beta : -1.88937 ( 1.88254 0.649384 )
Epeak [keV] : 55.3405 ( -38.4317 135.827 )
Norm@50keV : 0.128851 ( -0.132132 26.4826 )
------------------------------------------------------------
# Chi-Squared = 66.58 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 55 degrees of freedom
# Null hypothesis probability = 1.362518e-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] : 15.9450 (-2.89821 3.93494)
R^2/D10^2 : 8.15301E-02 (-0.0438988 0.0836137)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 70.48 using 59 PHA bins.
# Reduced chi-squared = 1.236 for 57 degrees of freedom
# Null hypothesis probability = 1.081981e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.289e-09 1.527e-09
25- 50 1.800e-08 5.246e-09
50-150 3.194e-08 1.069e-08
15-150 5.422e-08 1.450e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.998 ( )
Norm : 3.50609 (-3.50609 -3.50609)
------------------------------------------------------------
# Chi-Squared = 70.14 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 57 degrees of freedom
# Null hypothesis probability = 1.134883e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.729e-09 4.817e-09
25- 50 1.679e-08 9.240e-09
50-150 3.683e-08 2.051e-08
15-150 6.234e-08 3.420e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.7149 (-5.41211 5.38344)
R1^2/D10^2 : 0.183599 ( )
kT2 [keV] : 51.1479 (-46.6081 -52.5874)
R2^2/D10^2 : 1.09988E-03 (-0.000938211 0.0451267)
------------------------------------------------------------
# Chi-Squared = 66.43 using 59 PHA bins.
# Chi-Squared = 66.30 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 55 degrees of freedom
# Reduced chi-squared = 1.205 for 55 degrees of freedom
# Null hypothesis probability = 1.390505e-01
# Null hypothesis probability = 1.413881e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.758e-09 3.577e-09
25- 50 1.836e-08 1.052e-08
50-150 4.135e-08 2.161e-08
15-150 6.547e-08 3.293e-08
Plot creation:
Sat Aug 18 08:28:51 EDT 2012