batgrbproduct Analysis for Trigger=517566
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): Tue Mar 13 05:32:50 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger517566/GCN5_download_cron
======================================================================
Trigger: 00517566 Segment: 000
BAT Trigger Time: 353261196.736 [s; MET]
Trigger Stop: 353261198.784 [s; MET]
UTC: 2012-03-12T16:06:28.751080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 251.764016821549 Dec: 23.8567031121096 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.22
Image Trigger?: NO
Rate S/N Ratio: 13.1529464379659 [ if not an image trigger ]
Image S/N Ratio: 8.22
Flight Position: [ source = BAT ]
RA: 251.764016821549 Dec: 23.8567031121096 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 251.811934620112 Dec: 23.8808258554287 [deg; J2000]
{ 16h 47m 14.9s , +23d 52' 51.0" }
+/- 2.0181088245446 [arcmin] (estimated 90% radius based on SNR)
+/- 1.12904452184817 [arcmin] (formal 1-sigma fit error)
SNR: 11.1553516128217
Angular difference between Flight and Ground position is 3.001239 arcmin
Partial Coding Fraction: 0.359375 [ including projection effects ]
Duration
T90: 13.904000043869 +/- 3.17495196556641
Measured from: -0.887999892234802
to: 13.0160001516342 [s; relative to TRIGTIME]
T50: 5.66400003433228 +/- 3.03076490335593
Measured from: 0.952000141143799
to: 6.61600017547607 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.924000024795532
to: 1.92400002479553 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.86400002241135
to: 15.1280000209808 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.277150 0.348073 0.250468 0.067562
0.045442 0.041355 0.034448 0.028842 [error]
Peak 0.050838 0.046171 0.026360 0.025521
0.011449 0.010560 0.009340 0.007114 [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 9.94e-08 1.57e-07 1.86e-07 4.31e-07 5.68e-07 8.74e-07 erg/cm2
Error 2.15e-08 2.12e-08 3.36e-08 1.63e-07 8.07e-08 1.92e-07 erg/cm2
Peak flux Power-law 5.26e-01 4.21e-01 2.28e-01 1.79e-01 1.26e+00 1.35e+00 ph/cm2/s
Error 1.96e-01 9.61e-02 7.98e-02 1.29e-01 2.90e-01 3.04e-01 ph/cm2/s
Fluence Cutoff-PL 8.43e-08 1.71e-07 1.96e-07 1.44e-07 5.95e-07 0.00e+00 erg/cm2
Error 2.71e-08 2.67e-08 3.85e-08 3.11e-07 2.40e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 5.27e-01 4.22e-01 2.27e-01 1.78e-01 1.26e+00 1.35e+00 ph/cm2/s
Error 1.96e-01 9.63e-02 7.99e-02 1.66e-01 2.87e-01 3.09e-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 1.750 0.231 - - 3.62e-03 4.99e-04 60.540 57
CPL 0.822 1.155 63.2 -23.8 1.06e-02 2.29e-02 58.200 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.889 0.461 - - 8.79e-03 2.32e-03 52.990 57
CPL 1.896 0.464 9999.4 0.0 8.78e-03 0.00e+00 52.990 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: 4.416000 sec.
T50 in the 50-300 keV band: 1.984000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 16.992 -1.864 15.128
T90 13.904 -0.888 13.016
T50 5.664 0.952 6.616
Peak 1.000 0.924 1.924
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.8119 +23.8808 0.0173 41.6 164.1 1.0241 11.2 TRIG_00517566
------------------------------------------
Foreground time interval of the image:
-1.864 15.128 (delta_t = 16.992 [sec])
Background time interval of the image:
-49.235 -1.864 (delta_t = 47.371 [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 -1.864 sec. to 15.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74988 ( -0.226939 0.234192 )
Norm@50keV : 3.62120E-03 ( -0.000501509 0.000495957 )
------------------------------------------------------------
# Chi-Squared = 60.54 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.494080e-01
Photon flux (15-150 keV) in 16.99 sec: 0.489625 ( -0.0668811 0.0672088 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.67711e-07 ( -8.03207e-08 8.10882e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.864 sec. to 15.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.821913 ( -1.30707 1.00249 )
Epeak [keV] : 63.1949 ( -15.6579 -63.1947 )
Norm@50keV : 1.05984E-02 ( -0.0105987 0.0351442 )
------------------------------------------------------------
# Chi-Squared = 58.20 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 56 degrees of freedom
# Null hypothesis probability = 3.944030e-01
Photon flux (15-150 keV) in 16.99 sec: 0.466444 ( -0.072115 0.071939 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.94905e-07 ( -1.30626e-07 3.50373e-07 ) ergs/cm2
Band function
Time interval is from -1.864 sec. to 15.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.821892 ( 1.04058 0.973739 )
beta : -10.00000 ( 8.43746e+10 8.43746e+10 )
Epeak [keV] : 63.1829 ( -15.657 -63.183 )
Norm@50keV : 1.05984E-02 ( -0.0105984 0.0351754 )
------------------------------------------------------------
# Chi-Squared = 58.20 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 55 degrees of freedom
# Null hypothesis probability = 3.584865e-01
Photon flux (15-150 keV) in 16.99 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] : 13.9898 (-1.85183 2.14382)
R^2/D10^2 : 6.85476E-02 (-0.0283208 0.0473502)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 65.03 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 57 degrees of freedom
# Null hypothesis probability = 2.173518e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.815e-08 1.212e-08
25- 50 1.790e-07 3.293e-08
50-150 2.305e-07 6.206e-08
15-150 4.576e-07 8.656e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 116.353 (-26.189 -100.276)
Norm : 2.10429 (-0.342884 0.430282)
------------------------------------------------------------
# Chi-Squared = 58.74 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 57 degrees of freedom
# Null hypothesis probability = 4.115552e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.323e-08 1.815e-08
25- 50 1.659e-07 2.491e-08
50-150 2.915e-07 5.148e-08
15-150 5.506e-07 7.170e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.55194 (-2.07817 3.19526)
R1^2/D10^2 : 7.15437 (-6.72847 3735.82)
kT2 [keV] : 16.2350 (-2.70671 4.32416)
R2^2/D10^2 : 3.62284E-02 (-0.0227971 0.0253864)
------------------------------------------------------------
# Chi-Squared = 56.20 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 55 degrees of freedom
# Null hypothesis probability = 4.295375e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.374e-08 4.699e-08
25- 50 1.577e-07 5.012e-08
50-150 2.639e-07 1.024e-07
15-150 5.154e-07 1.510e-07
Peak spectrum fit
Power-law model
Time interval is from 0.924 sec. to 1.924 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88886 ( -0.436675 0.485968 )
Norm@50keV : 8.79466E-03 ( -0.00240553 0.002238 )
------------------------------------------------------------
# Chi-Squared = 52.99 using 59 PHA bins.
# Reduced chi-squared = 0.9296 for 57 degrees of freedom
# Null hypothesis probability = 6.262850e-01
Photon flux (15-150 keV) in 1 sec: 1.25620 ( -0.290113 0.29075 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.08486e-08 ( -2.07715e-08 2.11821e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.924 sec. to 1.924 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89594 ( -0.445965 0.481299 )
Epeak [keV] : 9999.35 ( )
Norm@50keV : 8.77823E-03 ( )
------------------------------------------------------------
# Chi-Squared = 52.99 using 59 PHA bins.
# Reduced chi-squared = 0.9463 for 56 degrees of freedom
# Null hypothesis probability = 5.895169e-01
Photon flux (15-150 keV) in 1 sec: 1.25594 ( -0.284575 0.29029 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15442e-07 ( -4.04208e-08 5.4918e-08 ) ergs/cm2
Band function
Time interval is from 0.924 sec. to 1.924 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.52540 ( 1.5254 1.5254 )
beta : -1.88883 ( 1.88884 0.436632 )
Epeak [keV] : 12.9071 ( -12.9069 -12.9069 )
Norm@50keV : 2.27997E-02 ( -0.0227999 13566.3 )
------------------------------------------------------------
# Chi-Squared = 52.99 using 59 PHA bins.
# Reduced chi-squared = 0.9634 for 55 degrees of freedom
# Null hypothesis probability = 5.518562e-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] : 10.0058 (-3.11509 5.42315)
R^2/D10^2 : 0.545336 (-0.428855 1.772)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 63.02 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 57 degrees of freedom
# Null hypothesis probability = 2.719907e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.112e-08 6.720e-09
25- 50 2.767e-08 1.391e-08
50-150 1.447e-08 8.948e-09
15-150 5.326e-08 2.821e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.6684 (-57.0976 -100.064)
Norm : 5.40175 (-1.52788 2.7166)
------------------------------------------------------------
# Chi-Squared = 54.52 using 59 PHA bins.
# Reduced chi-squared = 0.9565 for 57 degrees of freedom
# Null hypothesis probability = 5.687363e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.412e-08 4.576e-09
25- 50 2.440e-08 7.475e-09
50-150 3.946e-08 1.096e-08
15-150 7.798e-08 2.154e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.14548 (-2.73997 3.54904)
R1^2/D10^2 : 3.07928 (-2.52606 37.2151)
kT2 [keV] : 36.9163 (-33.1556 -37.1017)
R2^2/D10^2 : 4.24805E-03 (-0.00409419 0.0183616)
------------------------------------------------------------
# Chi-Squared = 52.77 using 59 PHA bins.
# Reduced chi-squared = 0.9595 for 55 degrees of freedom
# Null hypothesis probability = 5.603069e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.677e-08 9.825e-09
25- 50 2.204e-08 1.189e-08
50-150 4.706e-08 2.858e-08
15-150 8.588e-08 4.650e-08
Plot creation:
Tue Mar 13 06:05:05 EDT 2012