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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
343.6392 62.7355 0.0043 28.9498 -178.8907 1.8699315 44.449 TRIG_00206257
Foreground time interval of the image:
-2.796 10.821 (delta_t = 13.617 [sec])
Background time interval of the image:
-239.480 -2.796 (delta_t = 236.684 [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 0.256000
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 0.256000
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 0.256000
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 -2.796 sec. to 16.876 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52057 ( -0.0744831 0.0746901 )
Norm@50keV : 6.74979E-03 ( -0.000279819 0.00027948 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.50 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 57 degrees of freedom
# Null hypothesis probability = 2.871516e-01
Photon flux (15-150 keV) in 19.67 sec: 0.847386 ( -0.036377 0.036444 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25538e-06 ( -5.6259e-08 5.6461e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.796 sec. to 16.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18775 ( -0.304238 0.284121 )
Epeak [keV] : 126.320 ( -37.2446 348.715 )
Norm@50keV : 9.79977E-03 ( -0.00260726 0.00384587 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.44 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 56 degrees of freedom
# Null hypothesis probability = 3.858214e-01
Photon flux (15-150 keV) in 19.67 sec: 0.830597 ( -0.038921 0.038949 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22499e-06 ( -6.24247e-08 6.2287e-08 ) ergs/cm2
Band function
Time interval is from -2.796 sec. to 16.876 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18772 ( -0.319565 0.272448 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 126.296 ( -33.0619 350.697 )
Norm@50keV : 9.79884E-03 ( -0.00260753 0.00384621 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.44 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 55 degrees of freedom
# Null hypothesis probability = 3.501917e-01
Photon flux (15-150 keV) in 19.67 sec: 0.830465 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24083e-06 ( -1.2407e-06 -5.81485e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.7228 ( )
R^2/D10^2 : 7.92642E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 179.80 using 59 PHA bins.
# Reduced chi-squared = 3.1544 for 57 degrees of freedom
# Null hypothesis probability = 1.208142e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.999e-08 6.609e-09
25- 50 3.316e-07 1.751e-08
50-150 5.690e-07 4.760e-08
15-150 9.805e-07 4.691e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.45787 (-0.141052 0.14099)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.65 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 57 degrees of freedom
# Null hypothesis probability = 3.795349e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.694e-07 7.878e-09
25- 50 3.259e-07 1.515e-08
50-150 7.148e-07 3.078e-08
15-150 1.210e-06 5.675e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.37360 (-0.906865 1.05112)
R1^2/D10^2 : 1.15145 (-0.476158 0.892327)
kT2 [keV] : 24.1139 (-2.57269 3.53386)
R2^2/D10^2 : 1.47041E-02 (-0.00582463 0.00774451)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.96 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.020971e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.624e-07 2.700e-08
25- 50 3.162e-07 3.600e-08
50-150 7.353e-07 7.858e-08
15-150 1.214e-06 1.125e-07
Peak spectrum fit
Power-law model
Time interval is from 2.276 sec. to 3.276 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17729 ( -0.0964328 0.0955567 )
Norm@50keV : 2.49235E-02 ( -0.00144293 0.0014429 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.72 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 57 degrees of freedom
# Null hypothesis probability = 3.771963e-01
Photon flux (15-150 keV) in 1 sec: 2.91651 ( -0.173328 0.173482 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5451e-07 ( -1.62058e-08 1.62611e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.276 sec. to 3.276 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.732194 ( -0.402329 0.368388 )
Epeak [keV] : 152.163 ( -48.5364 396.28 )
Norm@50keV : 4.08882E-02 ( -0.0134434 0.0221153 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.37 using 59 PHA bins.
# Reduced chi-squared = 0.9888 for 56 degrees of freedom
# Null hypothesis probability = 4.986375e-01
Photon flux (15-150 keV) in 1 sec: 2.87718 ( -0.1764 0.17646 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.48404e-07 ( -1.7368e-08 1.7259e-08 ) ergs/cm2
Band function
Time interval is from 2.276 sec. to 3.276 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.55439 ( -3.8556 -4.55439 )
beta : -1.38504 ( -0.132709 0.127461 )
Epeak [keV] : 33.2903 ( -3.52273 3.46415 )
Norm@50keV : 204.555 ( -11.7392 760.964 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.72 using 59 PHA bins.
# Reduced chi-squared = 0.8312 for 55 degrees of freedom
# Null hypothesis probability = 8.094124e-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] : 18.5985 (-1.43275 1.57336)
R^2/D10^2 : 0.173446 (-0.0410476 0.0530049)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 108.60 using 59 PHA bins.
# Reduced chi-squared = 1.9052 for 57 degrees of freedom
# Null hypothesis probability = 4.558228e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.188e-08 1.350e-09
25- 50 5.629e-08 4.420e-09
50-150 1.425e-07 1.470e-08
15-150 2.106e-07 1.425e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 12.0323 (-0.712936 0.712868)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 96.11 using 59 PHA bins.
# Reduced chi-squared = 1.686 for 57 degrees of freedom
# Null hypothesis probability = 9.213707e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.997e-08 1.905e-09
25- 50 5.765e-08 4.365e-09
50-150 1.264e-07 2.654e-08
15-150 2.140e-07 3.100e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.07865 (-1.45171 1.71363)
R1^2/D10^2 : 1.13323 (-0.438923 0.75965)
kT2 [keV] : 35.5100 (-7.06885 14.51)
R2^2/D10^2 : 1.65885E-02 (-0.0106014 0.0181577)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.07 using 59 PHA bins.
# Reduced chi-squared = 0.8557 for 55 degrees of freedom
# Null hypothesis probability = 7.678691e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.120e-08 4.355e-09
25- 50 5.862e-08 1.161e-08
50-150 1.731e-07 7.585e-08
15-150 2.529e-07 7.460e-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: 1.49227 ( -0.0676821 0.0677884 )
Norm@50keV : 9.24095E-03 ( -0.000350803 0.000350547 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.71 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 57 degrees of freedom
# Null hypothesis probability = 4.126070e-01
Photon flux (15-150 keV) in 13.62 sec: 1.15125 ( -0.0455778 0.0456586 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19551e-06 ( -4.9047e-08 4.91965e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08865 ( -0.281822 0.264557 )
Epeak [keV] : 117.515 ( -28.3791 115.599 )
Norm@50keV : 1.44948E-02 ( -0.00361453 0.0051779 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.68 using 59 PHA bins.
# Reduced chi-squared = 0.9229 for 56 degrees of freedom
# Null hypothesis probability = 6.389585e-01
Photon flux (15-150 keV) in 13.62 sec: 1.12451 ( -0.04855 0.04861 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16158e-06 ( -5.42852e-08 5.41613e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.08862 ( -0.267564 0.275608 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 117.493 ( -19.9518 115.49 )
Norm@50keV : 1.44938E-02 ( -0.00361508 0.00517859 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.68 using 59 PHA bins.
# Reduced chi-squared = 0.9396 for 55 degrees of freedom
# Null hypothesis probability = 6.022449e-01
Photon flux (15-150 keV) in 13.62 sec: 1.12456 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17517e-06 ( -1.17507e-06 -5.12493e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 3.14e-07
S(50-100 keV) = 4.37e-07
T90 vs. Hardness ratio plot
T90 = 11.9960000216961 sec.
Hardness ratio (energy fluence ratio) = 1.39172
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.30457
Count Ratio (50-100 keV) / (15-25 keV) = 1.07131
Mask shadow pattern
IMX = -5.530599133369802E-01, IMY = 1.070934387382703E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
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:
-239.480000 -2.796000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5756 35.2024 0.6 32.3 100.4 6.3917 18.2 0.7 Cyg X-1
308.1273 41.1015 7.6 25.4 112.3 0.3360 1.5 9.0 Cyg X-3
326.3257 38.1847 5.7 11.1 112.9 0.3295 2.0 11.0 Cyg X-2
84.3472 82.8329 2.7 58.2 -175.1 4.0321 4.2 ------ UNKNOWN
358.1694 -21.9708 3.1 58.8 -24.0 4.3284 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.796000 10.820600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.4020 35.1915 10.1 32.5 100.4 0.0871 1.1 9.3 Cyg X-1
308.0935 40.8843 5.5 25.4 111.7 0.1178 2.1 4.2 Cyg X-3
326.1842 38.4705 4.6 11.3 114.1 -0.0997 -2.5 9.0 Cyg X-2
277.1639 77.3149 2.2 50.9 162.3 0.7269 5.2 ------ UNKNOWN
334.1073 12.9689 2.3 21.4 10.0 0.1997 5.0 ------ UNKNOWN
343.6392 62.7354 0.3 28.9 -178.9 1.8700 44.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
70.820600 743.520600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5902 35.2015 0.4 38.6 28.6 17.5421 28.8 0.0 Cyg X-1
308.0434 41.0882 8.3 30.1 24.0 -0.5567 -1.4 8.7 Cyg X-3
326.2435 38.2876 6.0 26.6 -5.4 0.7155 1.9 4.0 Cyg X-2
309.1625 32.3592 3.0 37.3 15.0 1.8135 3.9 ------ UNKNOWN
319.9655 65.1935 2.5 10.6 77.0 1.3647 4.7 ------ UNKNOWN
Plot creation:
Sun May 31 13:39:11 EDT 2015