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
234.9245 64.5286 0.0148 25.8715 144.6222 0.1055209 12.970 TRIG_00688452
Foreground time interval of the image:
-0.024 0.120 (delta_t = 0.144 [sec])
Background time interval of the image:
-239.776 -0.024 (delta_t = 239.752 [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 0.064000
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 0.064000
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 0.064000
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 -0.024 sec. to 0.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.976781 ( -0.247537 0.242403 )
Norm@50keV : 4.11888E-02 ( -0.00588858 0.00588095 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.21 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 57 degrees of freedom
# Null hypothesis probability = 3.949864e-01
Photon flux (15-150 keV) in 0.144 sec: 4.73678 ( -0.68242 0.68313 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.46803e-08 ( -1.03437e-08 1.04357e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 0.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.52379 ( -0.962364 0.527919 )
Epeak [keV] : 157.671 ( -209.597 -209.597 )
Norm@50keV : 2.36340E-03 ( -0.00236104 0.00650272 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.97 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 56 degrees of freedom
# Null hypothesis probability = 4.388540e-01
Photon flux (15-150 keV) in 0.144 sec: 4.67350 ( -0.69506 0.69432 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.38767e-08 ( -1.07329e-08 1.06776e-08 ) ergs/cm2
Band function
Time interval is from -0.024 sec. to 0.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.573602 ( -0.509029 0.487571 )
beta : 10.0000 ( -10 -10 )
Epeak [keV] : 214.316 ( -214.316 -214.316 )
Norm@50keV : 1.75503E-20 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.04 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 55 degrees of freedom
# Null hypothesis probability = 3.640424e-01
Photon flux (15-150 keV) in 0.144 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] : 24.3498 (-4.87592 6.16061)
R^2/D10^2 : 0.126188 (-0.0610923 0.121486)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.71 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 57 degrees of freedom
# Null hypothesis probability = 1.776291e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.898e-09 5.782e-10
25- 50 1.062e-08 2.868e-09
50-150 4.684e-08 1.293e-08
15-150 5.936e-08 1.503e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-36.5009 -200)
Norm : 18.4133 (-2.78815 2.78815)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.06 using 59 PHA bins.
# Reduced chi-squared = 1.282 for 57 degrees of freedom
# Null hypothesis probability = 7.449102e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.654e-09 3.866e-09
25- 50 1.280e-08 7.222e-09
50-150 2.807e-08 1.588e-08
15-150 4.752e-08 2.682e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.75797 (-3.26313 4.0081)
R1^2/D10^2 : 2.29247 (-1.71293 6.99451)
kT2 [keV] : 34.7067 (-8.85757 18.4432)
R2^2/D10^2 : 3.81436E-02 (-0.0272205 0.0603851)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.23 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 55 degrees of freedom
# Null hypothesis probability = 4.284562e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.451e-09 2.584e-09
25- 50 1.196e-08 6.184e-09
50-150 5.005e-08 2.762e-08
15-150 6.646e-08 3.568e-08
Peak spectrum fit
Power-law model
Time interval is from -0.450 sec. to 0.550 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.902341 ( -0.365452 0.338577 )
Norm@50keV : 8.02060E-03 ( -0.00162283 0.0015911 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.72 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 57 degrees of freedom
# Null hypothesis probability = 2.004395e-01
Photon flux (15-150 keV) in 1 sec: 0.920598 ( -0.183977 0.185562 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.99415e-08 ( -1.81257e-08 1.82542e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.450 sec. to 0.550 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.449488 ( -1.62291 0.730662 )
Epeak [keV] : 214.220 ( -214.495 -214.495 )
Norm@50keV : 1.22002E-02 ( -0.00554554 0.0336086 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.31 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 56 degrees of freedom
# Null hypothesis probability = 1.847799e-01
Photon flux (15-150 keV) in 1 sec: 0.899938 ( -0.192685 0.193182 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.86258e-08 ( -1.878e-08 1.8699e-08 ) ergs/cm2
Band function
Time interval is from -0.450 sec. to 0.550 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.571293 ( -0.464668 1.15354 )
beta : 10.0000 ( -10 -10 )
Epeak [keV] : 270.928 ( -270.928 -270.928 )
Norm@50keV : 3.36600E-21 ( 0.822496 -3.366e-21 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.14 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 55 degrees of freedom
# Null hypothesis probability = 1.646259e-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] : 26.7239 (-6.4157 9.59994)
R^2/D10^2 : 1.85751E-02 (-0.0109257 0.0243333)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.31 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 57 degrees of freedom
# Null hypothesis probability = 1.449653e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.222e-09 8.806e-10
25- 50 1.303e-08 5.518e-09
50-150 6.812e-08 3.029e-08
15-150 8.337e-08 2.998e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-51.1506 -200)
Norm : 3.78802 (-0.770498 0.770498)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.51 using 59 PHA bins.
# Reduced chi-squared = 1.325 for 57 degrees of freedom
# Null hypothesis probability = 5.092195e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.432e-09 5.525e-09
25- 50 1.814e-08 1.041e-08
50-150 3.979e-08 2.316e-08
15-150 6.737e-08 3.948e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.69701 (-5.03551 8.36239)
R1^2/D10^2 : 0.416039 (-0.391816 48.8255)
kT2 [keV] : 35.2253 (-10.8657 36.7355)
R2^2/D10^2 : 7.37652E-03 (-0.00645383 0.0140294)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.12 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 55 degrees of freedom
# Null hypothesis probability = 1.872523e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.615e-09 3.637e-09
25- 50 1.553e-08 9.180e-09
50-150 7.004e-08 3.896e-08
15-150 9.118e-08 4.773e-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: 0.976781 ( -0.247537 0.242403 )
Norm@50keV : 4.11888E-02 ( -0.00588858 0.00588095 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.21 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 57 degrees of freedom
# Null hypothesis probability = 3.949864e-01
Photon flux (15-150 keV) in 0.144 sec: 4.73677 ( -0.682282 0.683202 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.46811e-08 ( -1.0349e-08 1.04323e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.52158 ( -0.962305 0.527978 )
Epeak [keV] : 157.097 ( -209.605 -209.605 )
Norm@50keV : 2.36980E-03 ( -0.00236743 0.0064958 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.97 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 56 degrees of freedom
# Null hypothesis probability = 4.388740e-01
Photon flux (15-150 keV) in 0.144 sec: 4.67332 ( -0.69493 0.69405 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.39072e-08 ( -1.07376e-08 1.06736e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.573602 ( -0.509029 0.487571 )
beta : 10.0000 ( -10 -10 )
Epeak [keV] : 214.316 ( -214.316 -214.316 )
Norm@50keV : 1.75503E-20 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.04 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 55 degrees of freedom
# Null hypothesis probability = 3.640424e-01
Photon flux (15-150 keV) in 0.144 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) = 1.18e-08
S(50-100 keV) = 2.39e-08
T90 vs. Hardness ratio plot
T90 = 0.119999945163727 sec.
Hardness ratio (energy fluence ratio) = 2.02542
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.76874
Count Ratio (50-100 keV) / (15-25 keV) = 1.80553
Mask shadow pattern
IMX = -3.954131698522780E-01, IMY = -2.807748559407163E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
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:
-239.776000 -0.024000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.6127 35.2014 1.0 41.3 53.5 8.0354 11.6 1.1 Cyg X-1
308.0865 40.9908 1.9 35.1 43.2 2.3173 6.1 2.5 Cyg X-3
326.0736 38.4489 4.0 38.2 20.1 1.0346 2.9 8.9 Cyg X-2
9.5877 25.7938 2.9 57.5 -26.3 4.8436 4.0 ------ UNKNOWN
61.2704 55.5999 2.9 40.9 -87.3 4.0492 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.024000 0.120000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.4667 35.1232 31.8 41.4 53.7 0.0075 0.4 7.7 Cyg X-1
308.1906 41.0287 3.6 35.1 43.1 0.0391 3.2 5.8 Cyg X-3
326.0139 38.2916 3.6 38.3 20.2 0.0320 3.2 7.6 Cyg X-2
208.1963 49.0437 2.1 45.9 155.8 0.0980 5.4 ------ UNKNOWN
234.9245 64.5286 0.9 25.9 144.6 0.1055 13.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
57.724600 694.724600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4597 35.3370 27.0 31.4 72.7 0.2672 0.4 0.3 Her X-1
299.5756 35.1904 0.7 47.8 19.4 15.0901 16.0 1.0 Cyg X-1
308.2088 40.9587 4.6 46.7 7.4 1.7398 2.5 4.5 Cyg X-3
326.2690 38.2950 5.6 56.5 -5.7 -2.9081 -2.1 4.9 Cyg X-2
180.7149 23.0976 2.7 54.2 171.2 6.9920 4.2 ------ UNKNOWN
179.9050 31.1864 3.5 47.3 176.7 2.7678 3.3 ------ UNKNOWN
159.8498 29.1873 5.0 57.6 -165.4 5.2906 2.3 ------ UNKNOWN
153.3210 64.8791 2.8 32.5 -127.4 2.0082 4.1 ------ UNKNOWN
341.7000 46.4878 2.3 55.3 -22.6 6.1999 5.1 ------ UNKNOWN
348.1621 59.6129 3.1 46.1 -35.8 2.7496 3.8 ------ UNKNOWN
140.0827 45.4785 3.5 51.9 -138.6 6.8679 3.3 ------ UNKNOWN
Plot creation:
Tue Jun 21 11:22:50 EDT 2016