batgrbproduct Analysis for Trigger=517234
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): Thu Mar 8 12:01:03 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger517234/GCN5_download_cron
======================================================================
Trigger: 00517234 Segment: 000
BAT Trigger Time: 352880026.624 [s; MET]
Trigger Stop: 352880030.72 [s; MET]
UTC: 2012-03-08T06:13:38.654560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 219.077930337103 Dec: 79.7034623843718 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.74
Image Trigger?: NO
Rate S/N Ratio: 8.30662386291807 [ if not an image trigger ]
Image S/N Ratio: 8.74
Flight Position: [ source = BAT ]
RA: 219.077930337103 Dec: 79.7034623843718 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 219.127087432373 Dec: 79.6754350772687 [deg; J2000]
{ 14h 36m 30.5s , +79d 40' 31.6" }
+/- 1.28542987095289 [arcmin] (estimated 90% radius based on SNR)
+/- 0.461277313574822 [arcmin] (formal 1-sigma fit error)
SNR: 21.2488273949302
Angular difference between Flight and Ground position is 1.762550 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 60.567999958992 +/- 17.1355564828552
Measured from: -19.175999879837
to: 41.392000079155 [s; relative to TRIGTIME]
T50: 22.8559999465942 +/- 3.60629507533631
Measured from: -6.13199990987778
to: 16.7240000367165 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.624000012874603
to: 1.6240000128746 [s; relative to TRIGTIME]
Total Fluence
Measured from: -24.1520000100136
to: 58.2039999961853 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.659899 0.798476 0.505724 0.095160
0.044869 0.047188 0.043193 0.041326 [error]
Peak 0.023275 0.030195 0.019842 0.001433
0.005007 0.005475 0.005001 0.004647 [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 1.97e-07 3.17e-07 3.87e-07 9.27e-07 1.17e-06 1.83e-06 erg/cm2
Error 2.13e-08 2.21e-08 4.20e-08 2.07e-07 9.77e-08 2.46e-07 erg/cm2
Peak flux Power-law 2.25e-01 2.00e-01 1.23e-01 1.14e-01 5.96e-01 6.62e-01 ph/cm2/s
Error 6.93e-02 4.22e-02 4.10e-02 7.46e-02 1.26e-01 1.48e-01 ph/cm2/s
Fluence Cutoff-PL 1.82e-07 3.41e-07 3.86e-07 8.28e-07 1.09e-06 0.00e+00 erg/cm2
Error 2.44e-08 2.89e-08 4.66e-08 6.71e-07 1.12e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.17e-01 2.10e-01 1.23e-01 6.49e-02 5.88e-01 6.15e-01 ph/cm2/s
Error 7.63e-02 5.57e-02 4.51e-02 9.89e-02 1.29e-01 1.71e-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 1.714 0.128 - - 1.53e-03 1.21e-04 53.810 57
CPL 1.067 0.544 64.7 41.0 3.45e-03 2.63e-03 48.900 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.707 0.391 - - 4.48e-03 1.14e-03 68.940 57
CPL 1.321 1.541 75.1 0.0 7.46e-03 0.00e+00 68.760 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: 49.408000 sec.
T50 in the 50-300 keV band: 22.848000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 82.356 -24.152 58.204
T90 60.568 -19.176 41.392
T50 22.856 -6.132 16.724
Peak 1.000 0.624 1.624
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
219.1271 +79.6754 0.0090 19.9 -28.6 1.8906 21.2 TRIG_00517234
------------------------------------------
Foreground time interval of the image:
-24.152 33.477 (delta_t = 57.629 [sec])
Background time interval of the image:
-239.624 -200.694 (delta_t = 38.930 [sec])
-199.624 -53.214 (delta_t = 146.410 [sec])
-51.624 -24.152 (delta_t = 27.472 [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 -24.152 sec. to 58.204 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71374 ( -0.126914 0.129743 )
Norm@50keV : 1.52995E-03 ( -0.000121692 0.000120325 )
------------------------------------------------------------
# Chi-Squared = 53.81 using 59 PHA bins.
# Reduced chi-squared = 0.9441 for 57 degrees of freedom
# Null hypothesis probability = 5.954152e-01
Photon flux (15-150 keV) in 82.36 sec: 0.204180 ( -0.0142876 0.014293 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16546e-06 ( -9.70497e-08 9.84531e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.152 sec. to 58.204 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06687 ( -0.58072 0.507743 )
Epeak [keV] : 64.6811 ( -13.7145 68.3361 )
Norm@50keV : 3.45112E-03 ( -0.00159737 0.003658 )
------------------------------------------------------------
# Chi-Squared = 48.90 using 59 PHA bins.
# Reduced chi-squared = 0.8731 for 56 degrees of freedom
# Null hypothesis probability = 7.383620e-01
Photon flux (15-150 keV) in 82.36 sec: 0.197772 ( -0.015071 0.015074 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09038e-06 ( -1.10659e-07 1.13789e-07 ) ergs/cm2
Band function
Time interval is from -24.152 sec. to 58.204 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06680 ( -0.456459 0.627711 )
beta : -10.00000 ( 2.21948e+11 2.21948e+11 )
Epeak [keV] : 64.6675 ( -13.7116 68.3307 )
Norm@50keV : 3.45111E-03 ( -0.00159904 0.00366062 )
------------------------------------------------------------
# Chi-Squared = 48.90 using 59 PHA bins.
# Reduced chi-squared = 0.8890 for 55 degrees of freedom
# Null hypothesis probability = 7.057134e-01
Photon flux (15-150 keV) in 82.36 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] : 12.0062 (-1.033 1.14317)
R^2/D10^2 : 4.89913E-02 (-0.0138633 0.0191261)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 82.98 using 59 PHA bins.
# Reduced chi-squared = 1.456 for 57 degrees of freedom
# Null hypothesis probability = 1.394846e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.230e-07 1.429e-08
25- 50 3.874e-07 3.393e-08
50-150 3.359e-07 5.843e-08
15-150 8.463e-07 7.643e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 116.284 (-13.6954 65.8452)
Norm : 0.875765 (-0.0764428 0.0886587)
------------------------------------------------------------
# Chi-Squared = 49.36 using 59 PHA bins.
# Reduced chi-squared = 0.8659 for 57 degrees of freedom
# Null hypothesis probability = 7.540810e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.881e-07 1.861e-08
25- 50 3.346e-07 2.442e-08
50-150 5.879e-07 8.796e-08
15-150 1.111e-06 1.058e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.37965 (-1.47438 1.5869)
R1^2/D10^2 : 0.305881 (-0.156294 0.459543)
kT2 [keV] : 20.8724 (-4.15839 7.05226)
R2^2/D10^2 : 4.86299E-03 (-0.00328922 0.00831765)
------------------------------------------------------------
# Chi-Squared = 47.81 using 59 PHA bins.
# Reduced chi-squared = 0.8692 for 55 degrees of freedom
# Null hypothesis probability = 7.433571e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.811e-07 6.044e-08
25- 50 3.375e-07 1.018e-07
50-150 5.689e-07 2.905e-07
15-150 1.087e-06 3.745e-07
Peak spectrum fit
Power-law model
Time interval is from 0.624 sec. to 1.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70672 ( -0.373645 0.407931 )
Norm@50keV : 4.47736E-03 ( -0.0011637 0.00111321 )
------------------------------------------------------------
# Chi-Squared = 68.94 using 59 PHA bins.
# Reduced chi-squared = 1.210 for 57 degrees of freedom
# Null hypothesis probability = 1.334704e-01
Photon flux (15-150 keV) in 1 sec: 0.596046 ( -0.125679 0.125686 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.14338e-08 ( -1.08898e-08 1.14329e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.624 sec. to 1.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32108 ( -2.00576 1.0772 )
Epeak [keV] : 75.0901 ( )
Norm@50keV : 7.46083E-03 ( )
------------------------------------------------------------
# Chi-Squared = 68.76 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 56 degrees of freedom
# Null hypothesis probability = 1.177561e-01
Photon flux (15-150 keV) in 1 sec: 0.587836 ( -0.129512 0.129257 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.85358e-08 ( -2.10492e-08 4.72205e-08 ) ergs/cm2
Band function
Time interval is from 0.624 sec. to 1.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.06068 ( -1.79176 -1.79176 )
beta : -1.95811 ( 1.98306 0.615953 )
Epeak [keV] : 31.9695 ( -30.8332 60.7719 )
Norm@50keV : 0.373228 ( -0.366958 705.079 )
------------------------------------------------------------
# Chi-Squared = 68.42 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 55 degrees of freedom
# Null hypothesis probability = 1.055327e-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] : 11.0983 (-2.79883 3.76947)
R^2/D10^2 : 0.193444 (-0.125431 0.359849)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 73.45 using 59 PHA bins.
# Reduced chi-squared = 1.289 for 57 degrees of freedom
# Null hypothesis probability = 7.022878e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.987e-09 1.988e-09
25- 50 1.426e-08 6.037e-09
50-150 9.991e-09 5.377e-09
15-150 2.924e-08 1.231e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 115.390 (-49.2787 -100.244)
Norm : 2.56759 (-0.608025 0.897915)
------------------------------------------------------------
# Chi-Squared = 68.75 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 57 degrees of freedom
# Null hypothesis probability = 1.369211e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.697e-09 1.773e-09
25- 50 1.190e-08 2.888e-09
50-150 2.082e-08 5.455e-09
15-150 3.942e-08 9.060e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.06139 (-3.47859 4.99085)
R1^2/D10^2 : 1.14344 (-0.979566 36.2924)
kT2 [keV] : 21.0217 (-9.34742 -21.221)
R2^2/D10^2 : 1.33750E-02 (-0.0133882 0.120633)
------------------------------------------------------------
# Chi-Squared = 68.55 using 59 PHA bins.
# Reduced chi-squared = 1.246 for 55 degrees of freedom
# Null hypothesis probability = 1.036525e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.780e-09 4.099e-09
25- 50 1.151e-08 5.960e-09
50-150 1.946e-08 1.223e-08
15-150 3.776e-08 2.068e-08
Plot creation:
Thu Mar 8 12:25:58 EST 2012