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
344.0138 -21.6405 0.0172 37.7975 -164.0784 0.9576611 11.155 TRIG_00579982
Foreground time interval of the image:
-1.272 35.984 (delta_t = 37.256 [sec])
Background time interval of the image:
-345.571 -327.169 (delta_t = 18.403 [sec])
-239.672 -1.272 (delta_t = 238.400 [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 3.072000
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 3.072000
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 3.072000
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 -1.272 sec. to 35.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53588 ( -0.244468 0.248755 )
Norm@50keV : 1.72482E-03 ( -0.000244185 0.000242156 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.44 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 57 degrees of freedom
# Null hypothesis probability = 4.222430e-01
Photon flux (15-150 keV) in 37.26 sec: 0.217470 ( -0.0307615 0.030867 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.06261e-07 ( -9.24968e-08 9.34477e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.272 sec. to 35.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43780 ( )
Epeak [keV] : 273.927 ( )
Norm@50keV : 1.92841E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.45 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 56 degrees of freedom
# Null hypothesis probability = 3.855741e-01
Photon flux (15-150 keV) in 37.26 sec: 0.216891 ( -0.030934 0.031269 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.04361e-07 ( -9.90371e-08 9.49049e-08 ) ergs/cm2
Band function
Time interval is from -1.272 sec. to 35.984 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.47803 ( 1.33517 6.33516 )
beta : -1.81321 ( 1.80875 11.8076 )
Epeak [keV] : 463.465 ( -463.465 -463.465 )
Norm@50keV : 1.84305E-03 ( -0.000357927 0.00126978 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.43 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 55 degrees of freedom
# Null hypothesis probability = 3.506143e-01
Photon flux (15-150 keV) in 37.26 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] : 15.5097 (-2.58488 3.19209)
R^2/D10^2 : 2.15763E-02 (-0.0104191 0.0195632)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.39 using 59 PHA bins.
# Reduced chi-squared = 1.270 for 57 degrees of freedom
# Null hypothesis probability = 8.219519e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.024e-08 1.156e-08
25- 50 1.648e-07 3.858e-08
50-150 2.737e-07 7.629e-08
15-150 4.788e-07 1.115e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-88.1955 -199.363)
Norm : 0.887147 (-0.12153 0.12173)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.69 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 57 degrees of freedom
# Null hypothesis probability = 4.132509e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.231e-08 4.659e-08
25- 50 1.583e-07 8.806e-08
50-150 3.473e-07 1.947e-07
15-150 5.879e-07 3.288e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.85927 (-2.36585 4.37715)
R1^2/D10^2 : 0.848280 (-0.742093 3.36185)
kT2 [keV] : 21.7132 (-5.36112 17.5911)
R2^2/D10^2 : 5.77969E-03 (-0.00505929 0.0106051)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.20 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 55 degrees of freedom
# Null hypothesis probability = 3.249988e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.737e-08 4.880e-08
25- 50 1.408e-07 6.029e-08
50-150 3.507e-07 1.943e-07
15-150 5.789e-07 2.537e-07
Peak spectrum fit
Power-law model
Time interval is from 1.644 sec. to 2.644 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40758 ( -0.496528 0.499709 )
Norm@50keV : 5.48788E-03 ( -0.00150971 0.00150313 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.74 using 59 PHA bins.
# Reduced chi-squared = 0.8726 for 57 degrees of freedom
# Null hypothesis probability = 7.415663e-01
Photon flux (15-150 keV) in 1 sec: 0.669478 ( -0.190394 0.191438 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.29461e-08 ( -1.57419e-08 1.58987e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.644 sec. to 2.644 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40432 ( -0.50028 0.502448 )
Epeak [keV] : 9999.34 ( -9999.36 -9999.36 )
Norm@50keV : 5.49948E-03 ( -0.00151789 0.0287499 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.74 using 59 PHA bins.
# Reduced chi-squared = 0.8882 for 56 degrees of freedom
# Null hypothesis probability = 7.093386e-01
Photon flux (15-150 keV) in 1 sec: 0.671021 ( -0.195283 0.189295 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.27251e-08 ( -1.56068e-08 1.60426e-08 ) ergs/cm2
Band function
Time interval is from 1.644 sec. to 2.644 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.98410 ( 1.64499 1.9841 )
beta : -1.40585 ( -0.499505 0.496489 )
Epeak [keV] : 203.012 ( -115.787 -115.787 )
Norm@50keV : 5.48919E-03 ( 0.822496 -0.0054916 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.74 using 59 PHA bins.
# Reduced chi-squared = 0.9043 for 55 degrees of freedom
# Null hypothesis probability = 6.752642e-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] : 17.3022 (-6.56376 11.043)
R^2/D10^2 : 4.63404E-02 (-0.0453041 0.188569)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.01 using 59 PHA bins.
# Reduced chi-squared = 0.9651 for 57 degrees of freedom
# Null hypothesis probability = 5.500341e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.811e-09 1.713e-09
25- 50 1.261e-08 7.580e-09
50-150 2.711e-08 1.772e-08
15-150 4.253e-08 2.635e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-116.842 -199.363)
Norm : 2.77511 (-0.763127 0.763144)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.30 using 59 PHA bins.
# Reduced chi-squared = 0.8825 for 57 degrees of freedom
# Null hypothesis probability = 7.226156e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.910e-09 4.259e-09
25- 50 1.329e-08 7.875e-09
50-150 2.915e-08 1.751e-08
15-150 4.936e-08 2.964e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.74805 (-5.28168 7.25071)
R1^2/D10^2 : 0.534877 (-0.472302 1.14243)
kT2 [keV] : 38.2467 (-35.7823 -38.2467)
R2^2/D10^2 : 2.77241E-03 (-0.00272511 0.0358216)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.67 using 59 PHA bins.
# Reduced chi-squared = 0.9032 for 55 degrees of freedom
# Null hypothesis probability = 6.776196e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.204e-09 3.996e-09
25- 50 1.301e-08 7.495e-09
50-150 3.505e-08 1.996e-08
15-150 5.427e-08 2.897e-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: 1.53588 ( -0.244468 0.248755 )
Norm@50keV : 1.72482E-03 ( -0.000244185 0.000242156 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.44 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 57 degrees of freedom
# Null hypothesis probability = 4.222430e-01
Photon flux (15-150 keV) in 37.26 sec: 0.217470 ( -0.0307615 0.030867 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.06261e-07 ( -9.24968e-08 9.34477e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43780 ( )
Epeak [keV] : 273.927 ( )
Norm@50keV : 1.92841E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.45 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 56 degrees of freedom
# Null hypothesis probability = 3.855741e-01
Photon flux (15-150 keV) in 37.26 sec: 0.216891 ( -0.030937 0.031271 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.04361e-07 ( -9.90371e-08 9.49049e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.47803 ( 1.33517 6.33516 )
beta : -1.81321 ( 1.80875 11.8076 )
Epeak [keV] : 463.465 ( -463.465 -463.465 )
Norm@50keV : 1.84305E-03 ( -0.000357927 0.00126978 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.43 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 55 degrees of freedom
# Null hypothesis probability = 3.506143e-01
Photon flux (15-150 keV) in 37.26 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) = 1.53e-07
S(50-100 keV) = 2.10e-07
T90 vs. Hardness ratio plot
T90 = 30.1959999799728 sec.
Hardness ratio (energy fluence ratio) = 1.37255
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.31828
Count Ratio (50-100 keV) / (15-25 keV) = 1.1852
Mask shadow pattern
IMX = -7.458566769650892E-01, IMY = 2.127670626912365E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 3.072000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 3.072000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 3.072000
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:
-345.571410 -327.168500
-239.672000 -1.272000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.6404 35.0506 4.9 43.4 -38.9 0.8337 2.3 9.4 Cyg X-1
308.1190 40.9693 1.6 39.3 -26.8 1.9615 7.1 1.1 Cyg X-3
325.9991 38.2952 6.1 26.9 -14.5 0.3889 1.9 8.3 Cyg X-2
315.4964 -22.7049 2.3 47.5 -127.3 4.5213 5.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.272000 35.984000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5566 34.9813 0.0 43.4 -39.0 -0.2077 -1.6 13.3 Cyg X-1
307.9218 40.9644 4.5 39.4 -27.0 0.2494 2.6 8.6 Cyg X-3
326.3482 38.2314 21.2 26.7 -14.2 -0.0359 -0.5 9.9 Cyg X-2
1.2717 25.9220 2.2 19.3 73.3 0.3837 5.1 ------ UNKNOWN
344.0138 -21.6405 1.0 37.8 -164.1 0.9577 11.2 ------ UNKNOWN
322.6214 30.3562 2.2 23.8 -32.8 0.3573 5.2 ------ UNKNOWN
320.0967 1.5475 2.6 27.3 -103.3 0.3922 4.4 ------ UNKNOWN
339.1969 -42.8324 2.6 59.1 -159.6 1.6915 4.4 ------ UNKNOWN
329.0835 -33.8111 2.6 51.8 -148.0 0.9120 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
97.828590 962.395000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
5.6147 -0.5285 2.9 29.8 70.2 3.2817 3.9 338.4 UNKNOWN
321.4052 29.1264 3.4 55.3 -1.7 6.3725 3.4 ------ UNKNOWN
333.1227 -1.5069 2.9 22.8 -6.8 2.0934 4.0 ------ UNKNOWN
328.6049 9.8221 4.2 34.9 -4.8 1.8058 2.7 ------ UNKNOWN
351.4565 -42.9841 3.2 22.2 -171.9 1.8801 3.6 ------ UNKNOWN
22.0107 -77.8867 3.2 59.0 -166.1 12.8854 3.6 ------ UNKNOWN
299.3489 -24.9298 2.6 41.0 -81.1 10.8869 4.4 ------ UNKNOWN
299.6429 -36.0719 4.7 41.1 -98.1 7.5405 2.5 ------ UNKNOWN
300.8035 -55.4357 3.1 46.6 -125.1 9.1728 3.7 ------ UNKNOWN
Plot creation:
Sat May 30 14:59:38 EDT 2015