batgrbproduct Analysis for Trigger=517489
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): Mon Mar 12 08:13:14 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger517489/GCN5_download_cron
======================================================================
Trigger: 00517489 Segment: 000
BAT Trigger Time: 353171298.816 [s; MET]
Trigger Stop: 353171299.84 [s; MET]
UTC: 2012-03-11T15:08:10.834740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 258.501429204094 Dec: -13.0597932121755 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.22
Image Trigger?: NO
Rate S/N Ratio: 16.1864140562386 [ if not an image trigger ]
Image S/N Ratio: 7.22
Flight Position: [ source = BAT ]
RA: 258.501429204094 Dec: -13.0597932121755 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 258.551774771999 Dec: -13.0622687768296 [deg; J2000]
{ 17h 14m 12.4s , -13d 03' 44.2" }
+/- 1.27362599045826 [arcmin] (estimated 90% radius based on SNR)
+/- 0.592481182601784 [arcmin] (formal 1-sigma fit error)
SNR: 21.5307175788031
Angular difference between Flight and Ground position is 2.946334 arcmin
Partial Coding Fraction: 0.625 [ including projection effects ]
Duration
T90: 28.3599999547005 +/- 4.99613014581199
Measured from: -9.61599987745285
to: 18.7440000772476 [s; relative to TRIGTIME]
T50: 12.283999979496 +/- 1.35256939297699
Measured from: -1.61999988555908
to: 10.6640000939369 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 9.0440000295639
to: 10.0440000295639 [s; relative to TRIGTIME]
Total Fluence
Measured from: -13.7719999551773
to: 21.6320000290871 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.680173 0.732726 0.352859 0.078009
0.045472 0.044647 0.037731 0.035493 [error]
Peak 0.063164 0.079668 0.022540 0.001793
0.008203 0.008455 0.006749 0.006105 [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 2.18e-07 3.03e-07 3.12e-07 5.87e-07 1.02e-06 1.42e-06 erg/cm2
Error 2.36e-08 2.19e-08 3.69e-08 1.39e-07 8.53e-08 1.77e-07 erg/cm2
Peak flux Power-law 6.90e-01 4.82e-01 2.21e-01 1.42e-01 1.46e+00 1.53e+00 ph/cm2/s
Error 1.25e-01 6.88e-02 5.21e-02 6.04e-02 2.06e-01 2.18e-01 ph/cm2/s
Fluence Cutoff-PL 2.06e-07 3.24e-07 3.01e-07 2.21e-07 9.50e-07 0.00e+00 erg/cm2
Error 2.62e-08 3.07e-08 4.35e-08 1.04e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 5.49e-01 6.56e-01 1.83e-01 6.35e-03 1.39e+00 1.39e+00 ph/cm2/s
Error 1.52e-01 1.09e-01 6.91e-02 1.50e-02 2.05e-01 2.05e-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 1.40e+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 1.959 0.135 - - 3.13e-03 2.70e-04 57.540 57
CPL 1.371 0.642 44.6 57.9 6.82e-03 7.05e-03 54.620 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.121 0.242 - - 9.19e-03 1.68e-03 81.420 57
CPL -0.887 1.842 37.1 5.4 5.89e-01 5.69e+00 67.620 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: 21.760000 sec.
T50 in the 50-300 keV band: 11.264000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 35.404 -13.772 21.632
T90 28.360 -9.616 18.744
T50 12.284 -1.620 10.664
Peak 1.000 9.044 10.044
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
258.5518 -13.0623 0.0089 30.9 22.3 2.1805 21.5 TRIG_00517489
------------------------------------------
Foreground time interval of the image:
-13.772 21.632 (delta_t = 35.404 [sec])
Background time interval of the image:
-239.816 -13.772 (delta_t = 226.044 [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 -13.772 sec. to 21.632 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95884 ( -0.133269 0.136957 )
Norm@50keV : 3.13005E-03 ( -0.000271527 0.000267836 )
------------------------------------------------------------
# Chi-Squared = 57.54 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.551996e-01
Photon flux (15-150 keV) in 35.4 sec: 0.460841 ( -0.0337459 0.0337754 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01999e-06 ( -8.4818e-08 8.58323e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -13.772 sec. to 21.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37134 ( -0.699979 0.584673 )
Epeak [keV] : 44.6161 ( -16.1719 99.5334 )
Norm@50keV : 6.82055E-03 ( -0.00362423 0.0104769 )
------------------------------------------------------------
# Chi-Squared = 54.62 using 59 PHA bins.
# Reduced chi-squared = 0.9753 for 56 degrees of freedom
# Null hypothesis probability = 5.273185e-01
Photon flux (15-150 keV) in 35.4 sec: 0.449046 ( -0.03574 0.035673 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.50023e-07 ( -1.02207e-07 1.05694e-07 ) ergs/cm2
Band function
Time interval is from -13.772 sec. to 21.632 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.98627 ( -5.15624 -3.70405 )
beta : -2.14365 ( -0.404685 0.189924 )
Epeak [keV] : 24.8595 ( -4.04351 20.7215 )
Norm@50keV : 90.6693 ( -90.7971 114.784 )
------------------------------------------------------------
# Chi-Squared = 50.97 using 59 PHA bins.
# Reduced chi-squared = 0.9267 for 55 degrees of freedom
# Null hypothesis probability = 6.293152e-01
Photon flux (15-150 keV) in 35.4 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] : 10.0102 (-0.805519 0.88743)
R^2/D10^2 : 0.212474 (-0.0599929 0.0823136)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 83.26 using 59 PHA bins.
# Reduced chi-squared = 1.461 for 57 degrees of freedom
# Null hypothesis probability = 1.322196e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.536e-07 2.034e-08
25- 50 3.823e-07 3.214e-08
50-150 2.001e-07 4.172e-08
15-150 7.360e-07 6.425e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 69.9704 (-14.4785 21.0579)
Norm : 2.26002 (-0.264652 0.307768)
------------------------------------------------------------
# Chi-Squared = 54.51 using 59 PHA bins.
# Reduced chi-squared = 0.9564 for 57 degrees of freedom
# Null hypothesis probability = 5.689810e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.052e-07 2.055e-08
25- 50 3.265e-07 2.598e-08
50-150 4.193e-07 7.537e-08
15-150 9.510e-07 9.009e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.37446 (-1.37622 1.28057)
R1^2/D10^2 : 0.556900 (-0.229628 0.528027)
kT2 [keV] : 28.5322 (-10.2813 39.1021)
R2^2/D10^2 : 2.45194E-03 (-0.0022093 0.0111012)
------------------------------------------------------------
# Chi-Squared = 51.56 using 59 PHA bins.
# Reduced chi-squared = 0.9374 for 55 degrees of freedom
# Null hypothesis probability = 6.068762e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.926e-07 3.696e-08
25- 50 3.428e-07 7.239e-08
50-150 4.575e-07 2.184e-07
15-150 9.929e-07 2.834e-07
Peak spectrum fit
Power-law model
Time interval is from 9.044 sec. to 10.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12101 ( -0.232306 0.251141 )
Norm@50keV : 9.19288E-03 ( -0.00169825 0.00166959 )
------------------------------------------------------------
# Chi-Squared = 81.42 using 59 PHA bins.
# Reduced chi-squared = 1.428 for 57 degrees of freedom
# Null hypothesis probability = 1.857328e-02
Photon flux (15-150 keV) in 1 sec: 1.46147 ( -0.205889 0.205895 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.55813e-08 ( -1.41693e-08 1.45622e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.044 sec. to 10.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.886799 ( -2.11704 1.56657 )
Epeak [keV] : 37.1131 ( -5.21014 5.59888 )
Norm@50keV : 0.589438 ( -0.615385 10.7734 )
------------------------------------------------------------
# Chi-Squared = 67.62 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 56 degrees of freedom
# Null hypothesis probability = 1.374732e-01
Photon flux (15-150 keV) in 1 sec: 1.39309 ( -0.20421 0.20511 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.36769e-08 ( -1.17579e-08 1.32587e-08 ) ergs/cm2
Band function
Time interval is from 9.044 sec. to 10.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.829176 ( -1.48646 2.19424 )
beta : -9.37167 ( 10 19.9995 )
Epeak [keV] : 37.3170 ( -5.05865 5.46083 )
Norm@50keV : 0.538005 ( -0.538148 18.406 )
------------------------------------------------------------
# Chi-Squared = 67.63 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 55 degrees of freedom
# Null hypothesis probability = 1.180254e-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] : 9.57009 (-1.12123 1.24502)
R^2/D10^2 : 0.886033 (-0.340454 0.549841)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 67.85 using 59 PHA bins.
# Reduced chi-squared = 1.190 for 57 degrees of freedom
# Null hypothesis probability = 1.539508e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.626e-08 3.795e-09
25- 50 3.793e-08 7.260e-09
50-150 1.741e-08 6.165e-09
15-150 7.160e-08 1.306e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 50.0637 (-13.6801 22.3589)
Norm : 8.56337 (-1.70415 2.18799)
------------------------------------------------------------
# Chi-Squared = 73.74 using 59 PHA bins.
# Reduced chi-squared = 1.294 for 57 degrees of freedom
# Null hypothesis probability = 6.712253e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.094e-08 3.840e-09
25- 50 3.009e-08 4.860e-09
50-150 2.925e-08 1.047e-08
15-150 8.029e-08 1.722e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.75383 (-2.71026 -2.71026)
R1^2/D10^2 : 25.1319 (-26.9571 -26.9571)
kT2 [keV] : 9.98957 (-1.38436 -9.99323)
R2^2/D10^2 : 0.719890 (-0.719156 0.616187)
------------------------------------------------------------
# Chi-Squared = 67.12 using 59 PHA bins.
# Reduced chi-squared = 1.220 for 55 degrees of freedom
# Null hypothesis probability = 1.266621e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.733e-08 9.425e-09
25- 50 3.660e-08 2.045e-08
50-150 1.889e-08 1.005e-08
15-150 7.282e-08 4.022e-08
Plot creation:
Mon Mar 12 09:50:59 EDT 2012