Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
132.1705 -16.3432 0.0109 12.3190 124.3787 0.6975210 17.631 TRIG_00670800
Foreground time interval of the image:
0.020 10.941 (delta_t = 10.921 [sec])
Background time interval of the image:
-728.859 -709.246 (delta_t = 19.613 [sec])
-239.360 0.020 (delta_t = 239.380 [sec])
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
8 ms binning
From T100_start-3 s to T100_start+3 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
2 ms binning
From T100_start-1 s to T100_start+1 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Quad-rate summed light curves (from T0-300s to T0+1000s)
Spectral Evolution
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from 0.020 sec. to 14.472 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28512 ( -0.203745 0.218687 )
Norm@50keV : 2.45111E-03 ( -0.000375634 0.000369281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.28 using 59 PHA bins.
# Reduced chi-squared = 0.9173 for 57 degrees of freedom
# Null hypothesis probability = 6.523348e-01
Photon flux (15-150 keV) in 14.45 sec: 0.424883 ( -0.042257 0.042257 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.37627e-07 ( -4.19499e-08 4.32175e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.020 sec. to 14.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77786 ( -1.09698 0.22099 )
Epeak [keV] : 16.1491 ( -15.6995 23.4895 )
Norm@50keV : 5.07737E-03 ( -0.00510034 0.0204349 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.24 using 59 PHA bins.
# Reduced chi-squared = 0.9150 for 56 degrees of freedom
# Null hypothesis probability = 6.552671e-01
Photon flux (15-150 keV) in 14.45 sec: 0.417151 ( -0.043925 0.043803 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.17299e-07 ( -4.92414e-08 5.12268e-08 ) ergs/cm2
Band function
Time interval is from 0.020 sec. to 14.472 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.320479 ( 0.978149 0.978149 )
beta : -2.55976 ( 2.52121 0.352962 )
Epeak [keV] : 24.2969 ( -23.2607 8.55892 )
Norm@50keV : 5.94314E-02 ( -0.0594567 576.607 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.18 using 59 PHA bins.
# Reduced chi-squared = 0.9123 for 55 degrees of freedom
# Null hypothesis probability = 6.591091e-01
Photon flux (15-150 keV) in 14.45 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] : 7.70521 (-0.867147 0.983064)
R^2/D10^2 : 0.534616 (-0.206257 0.337076)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.62 using 59 PHA bins.
# Reduced chi-squared = 1.169 for 57 degrees of freedom
# Null hypothesis probability = 1.798214e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.054e-08 1.383e-08
25- 50 1.319e-07 1.866e-08
50-150 3.057e-08 1.056e-08
15-150 2.430e-07 2.998e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 40.5098 (-9.68354 14.6312)
Norm : 2.71408 (-0.508582 0.658047)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.75 using 59 PHA bins.
# Reduced chi-squared = 0.9078 for 57 degrees of freedom
# Null hypothesis probability = 6.718931e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.044e-08 1.183e-08
25- 50 1.196e-07 1.509e-08
50-150 9.384e-08 3.007e-08
15-150 3.039e-07 4.400e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.47675 (-1.34728 1.30269)
R1^2/D10^2 : 1.68323 (-0.910204 3.13007)
kT2 [keV] : 18.4420 (-6.44466 16.0864)
R2^2/D10^2 : 9.66246E-03 (-0.00869626 0.0523772)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.15 using 59 PHA bins.
# Reduced chi-squared = 0.9118 for 55 degrees of freedom
# Null hypothesis probability = 6.600264e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.344e-08 4.193e-08
25- 50 1.126e-07 4.508e-08
50-150 1.145e-07 6.637e-08
15-150 3.206e-07 1.366e-07
Peak spectrum fit
Power-law model
Time interval is from 2.172 sec. to 3.172 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02596 ( -0.185595 0.195725 )
Norm@50keV : 1.13811E-02 ( -0.00150172 0.0014686 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.30 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 57 degrees of freedom
# Null hypothesis probability = 2.105032e-01
Photon flux (15-150 keV) in 1 sec: 1.72800 ( -0.17787 0.17791 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05133e-07 ( -1.28355e-08 1.3065e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.172 sec. to 3.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43742 ( -1.14861 0.700244 )
Epeak [keV] : 38.1416 ( )
Norm@50keV : 2.55914E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.92 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 56 degrees of freedom
# Null hypothesis probability = 2.183001e-01
Photon flux (15-150 keV) in 1 sec: 1.69676 ( -0.18444 0.18347 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 2.172 sec. to 3.172 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -4.13566E-02 ( -1.66015 0.0226415 )
beta : -2.39311 ( -0.764027 0.379183 )
Epeak [keV] : 31.4168 ( -9.1615 11.7146 )
Norm@50keV : 0.237545 ( -0.266219 839.244 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.01 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 55 degrees of freedom
# Null hypothesis probability = 2.688578e-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] : 9.06493 (-0.962727 1.0939)
R^2/D10^2 : 1.19375 (-0.432312 0.66159)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.83 using 59 PHA bins.
# Reduced chi-squared = 1.330 for 57 degrees of freedom
# Null hypothesis probability = 4.835433e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.917e-08 3.130e-09
25- 50 4.120e-08 5.145e-09
50-150 1.607e-08 4.910e-09
15-150 7.644e-08 1.011e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 60.5369 (-16.1262 25.6931)
Norm : 9.06189 (-1.49862 1.76296)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.87 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 57 degrees of freedom
# Null hypothesis probability = 2.477730e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.281e-08 3.130e-09
25- 50 3.481e-08 3.785e-09
50-150 3.990e-08 1.081e-08
15-150 9.751e-08 1.241e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.40848 (-1.48446 1.3596)
R1^2/D10^2 : 2.27172 (-1.01797 2.47863)
kT2 [keV] : 35.6686 (-17.6297 -35.7003)
R2^2/D10^2 : 4.09927E-03 (-0.00399364 0.0438433)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.03 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 55 degrees of freedom
# Null hypothesis probability = 2.984281e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.189e-08 5.305e-09
25- 50 3.707e-08 1.051e-08
50-150 4.603e-08 2.351e-08
15-150 1.050e-07 3.515e-08
Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)
Power-law model
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.32134 ( -0.189276 0.202365 )
Norm@50keV : 3.04028E-03 ( -0.000435309 0.000429414 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.28 using 59 PHA bins.
# Reduced chi-squared = 0.8119 for 57 degrees of freedom
# Null hypothesis probability = 8.441659e-01
Photon flux (15-150 keV) in 10.92 sec: 0.537694 ( -0.0498342 0.0498349 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.18542e-07 ( -3.65124e-08 3.7557e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51247 ( -1.12313 0.607575 )
Epeak [keV] : 21.8782 ( )
Norm@50keV : 9.78032E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.62 using 59 PHA bins.
# Reduced chi-squared = 0.7790 for 56 degrees of freedom
# Null hypothesis probability = 8.857762e-01
Photon flux (15-150 keV) in 10.92 sec: 0.522987 ( -0.051559 0.051837 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91192e-07 ( -4.09544e-08 4.59142e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.330937 ( -4.08797 0.626511 )
beta : -2.72007 ( 9.37162 19.3716 )
Epeak [keV] : 25.3258 ( -21.2186 11.3995 )
Norm@50keV : 0.216930 ( -0.204134 479.577 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.03 using 59 PHA bins.
# Reduced chi-squared = 0.7642 for 55 degrees of freedom
# Null hypothesis probability = 9.005510e-01
Photon flux (15-150 keV) in 10.92 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.09e-07
S(50-100 keV) = 8.93e-08
T90 vs. Hardness ratio plot
T90 = 11.5359999537468 sec.
Hardness ratio (energy fluence ratio) = 0.819266
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.886587
Count Ratio (50-100 keV) / (15-25 keV) = 0.358511
Mask shadow pattern
IMX = -1.233120555355369E-01, IMY = -1.802365736885335E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image:
-728.859370 -709.246000
-239.360000 0.020000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4825 -40.5198 1.9 13.0 -87.0 1.4148 6.1 3.0 Vela X-1
87.7110 -15.2716 3.4 40.9 32.8 1.7018 3.4 ------ UNKNOWN
178.1922 -0.4007 3.5 54.1 -179.4 3.2221 3.3 ------ UNKNOWN
113.0676 -43.6030 2.6 20.2 -30.0 1.0636 4.4 ------ UNKNOWN
188.2774 -11.3236 3.2 57.1 -161.7 4.3225 3.6 ------ UNKNOWN
190.7842 -12.5442 3.4 58.8 -159.2 6.2800 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.020000 10.940600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4177 -40.6336 6.7 13.1 -86.6 -0.0744 -1.7 6.9 Vela X-1
159.4470 2.1045 2.5 41.8 161.2 0.3792 4.6 ------ UNKNOWN
132.1712 -16.3427 0.7 12.3 124.4 0.6954 17.6 ------ UNKNOWN
168.6909 -7.9452 2.2 42.1 -178.4 0.3491 5.2 ------ UNKNOWN
69.3943 -51.7204 2.8 49.9 -22.2 0.3701 4.2 ------ UNKNOWN
140.2822 -68.2415 2.1 40.3 -73.0 0.7187 5.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
44.140620 838.585900
840.640000 962.680000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4329 -40.5418 1.8 24.3 -76.0 4.7432 6.5 4.4 Vela X-1
92.4733 -4.0935 2.8 40.9 33.0 4.4669 4.1 ------ UNKNOWN
79.2750 -18.5847 3.1 50.3 9.1 5.3358 3.8 ------ UNKNOWN
164.3697 -3.6151 2.8 34.1 -178.5 3.0126 4.2 ------ UNKNOWN
159.9292 -32.0413 2.9 29.6 -123.0 2.9901 3.9 ------ UNKNOWN
170.4299 -44.4805 3.3 42.7 -110.7 10.1817 3.5 ------ UNKNOWN
Plot creation:
Fri Mar 18 11:53:50 EDT 2016