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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
349.3756 43.3713 0.0101 24.5953 -91.8839 0.4085600 19.003 TRIG_00412217
Foreground time interval of the image:
-0.392 2.160 (delta_t = 2.552 [sec])
Background time interval of the image:
-239.740 -0.392 (delta_t = 239.348 [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
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)
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 -0.392 sec. to 2.160 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29353 ( -0.142678 0.142544 )
Norm@50keV : 1.06286E-02 ( -0.000895389 0.000893371 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.90 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 57 degrees of freedom
# Null hypothesis probability = 3.057006e-01
Photon flux (15-150 keV) in 2.552 sec: 1.26652 ( -0.107441 0.107534 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.6846e-07 ( -2.53962e-08 2.5595e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.392 sec. to 2.160 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.842173 ( -0.591444 0.503998 )
Epeak [keV] : 134.749 ( -49.4951 -134.749 )
Norm@50keV : 1.76259E-02 ( -0.00735427 0.0156527 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.72 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 56 degrees of freedom
# Null hypothesis probability = 3.422513e-01
Photon flux (15-150 keV) in 2.552 sec: 1.24393 ( -0.11076 0.11065 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60934e-07 ( -2.72472e-08 2.72375e-08 ) ergs/cm2
Band function
Time interval is from -0.392 sec. to 2.160 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.842751 ( -0.366023 0.781176 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 134.842 ( -47.3535 -134.842 )
Norm@50keV : 1.76134E-02 ( -0.00734348 0.0156701 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.72 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 55 degrees of freedom
# Null hypothesis probability = 3.083395e-01
Photon flux (15-150 keV) in 2.552 sec: 1.25339 ( ) 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] : 17.8640 (-1.93811 2.19072)
R^2/D10^2 : 8.32288E-02 (-0.0265393 0.0388709)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.80 using 59 PHA bins.
# Reduced chi-squared = 1.523 for 57 degrees of freedom
# Null hypothesis probability = 6.677160e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.360e-08 2.322e-09
25- 50 6.256e-08 7.784e-09
50-150 1.446e-07 2.222e-08
15-150 2.208e-07 2.412e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.21468 (-0.439275 0.439256)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.92 using 59 PHA bins.
# Reduced chi-squared = 1.209 for 57 degrees of freedom
# Null hypothesis probability = 1.338292e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.314e-08 4.211e-09
25- 50 6.374e-08 1.696e-08
50-150 1.398e-07 7.079e-08
15-150 2.367e-07 7.077e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.61809 (-1.6076 2.03545)
R1^2/D10^2 : 1.28469 (-0.757218 2.21501)
kT2 [keV] : 26.2122 (-4.47566 7.35943)
R2^2/D10^2 : 1.96622E-02 (-0.0112667 0.0241579)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.57 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Null hypothesis probability = 4.161595e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.752e-08 1.222e-08
25- 50 6.047e-08 1.977e-08
50-150 1.749e-07 6.647e-08
15-150 2.629e-07 8.559e-08
Peak spectrum fit
Power-law model
Time interval is from 1.012 sec. to 2.012 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33261 ( -0.144046 0.144909 )
Norm@50keV : 1.76342E-02 ( -0.00155481 0.00155066 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.95 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 57 degrees of freedom
# Null hypothesis probability = 2.193059e-01
Photon flux (15-150 keV) in 1 sec: 2.11697 ( -0.185026 0.185117 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72913e-07 ( -1.71541e-08 1.72985e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.012 sec. to 2.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.712934 ( -0.645938 0.565095 )
Epeak [keV] : 106.750 ( -31.4806 415.43 )
Norm@50keV : 3.58361E-02 ( -0.0167576 0.0371979 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.40 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 56 degrees of freedom
# Null hypothesis probability = 2.887643e-01
Photon flux (15-150 keV) in 1 sec: 2.07178 ( -0.19006 0.18983 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66252e-07 ( -1.8444e-08 1.8504e-08 ) ergs/cm2
Band function
Time interval is from 1.012 sec. to 2.012 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.713195 ( -0.273275 0.665773 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 106.760 ( -23.6084 411.387 )
Norm@50keV : 3.58238E-02 ( -0.0167294 0.0372374 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.40 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 55 degrees of freedom
# Null hypothesis probability = 2.575900e-01
Photon flux (15-150 keV) in 1 sec: 2.08345 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66228e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.8653 (-1.80124 2.02316)
R^2/D10^2 : 0.170146 (-0.0538993 0.0785966)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.96 using 59 PHA bins.
# Reduced chi-squared = 1.455 for 57 degrees of freedom
# Null hypothesis probability = 1.399596e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.878e-09 1.701e-09
25- 50 4.343e-08 5.270e-09
50-150 8.797e-08 1.531e-08
15-150 1.413e-07 1.770e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 8.64918 (-0.758614 0.758616)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.57 using 59 PHA bins.
# Reduced chi-squared = 1.203 for 57 degrees of freedom
# Null hypothesis probability = 1.402623e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.166e-08 2.415e-09
25- 50 4.167e-08 1.205e-08
50-150 9.140e-08 4.109e-08
15-150 1.547e-07 5.365e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.54883 (-1.91401 2.50068)
R1^2/D10^2 : 2.10778 (-1.34445 5.18852)
kT2 [keV] : 24.0113 (-4.21787 7.58217)
R2^2/D10^2 : 4.31441E-02 (-0.0274402 0.0370173)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.77 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Null hypothesis probability = 3.066839e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.789e-08 8.527e-09
25- 50 4.068e-08 1.452e-08
50-150 1.074e-07 4.175e-08
15-150 1.660e-07 6.495e-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: 1.29353 ( -0.142678 0.142544 )
Norm@50keV : 1.06286E-02 ( -0.000895389 0.000893371 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.90 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 57 degrees of freedom
# Null hypothesis probability = 3.057006e-01
Photon flux (15-150 keV) in 2.552 sec: 1.26652 ( -0.107441 0.107534 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.6846e-07 ( -2.53962e-08 2.5595e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.842173 ( -0.591444 0.503998 )
Epeak [keV] : 134.749 ( -49.4951 -134.749 )
Norm@50keV : 1.76259E-02 ( -0.00735427 0.0156527 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.72 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 56 degrees of freedom
# Null hypothesis probability = 3.422513e-01
Photon flux (15-150 keV) in 2.552 sec: 1.24393 ( -0.11076 0.11065 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60934e-07 ( -2.72472e-08 2.72375e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.842751 ( -0.366023 0.781176 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 134.842 ( -47.3535 -134.842 )
Norm@50keV : 1.76134E-02 ( -0.00734348 0.0156701 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.72 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 55 degrees of freedom
# Null hypothesis probability = 3.083395e-01
Photon flux (15-150 keV) in 2.552 sec: 1.25339 ( ) 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) = 5.95e-08
S(50-100 keV) = 9.72e-08
T90 vs. Hardness ratio plot
T90 = 2.21599996089935 sec.
Hardness ratio (energy fluence ratio) = 1.63361
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.34802
Count Ratio (50-100 keV) / (15-25 keV) = 1.34223
Mask shadow pattern
IMX = -1.504800972880541E-02, IMY = 4.574892327589972E-01
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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:
-239.740000 -0.392000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.0571 41.0946 13.5 45.2 -50.7 0.5298 0.9 8.9 Cyg X-3
326.1714 38.3318 408.7 38.8 -69.7 -0.0135 -0.0 0.6 Cyg X-2
256.1941 76.4150 2.8 37.2 13.5 1.0017 4.1 ------ UNKNOWN
265.6416 48.1934 2.5 57.5 -14.3 3.8025 4.6 ------ UNKNOWN
14.2221 7.6458 3.2 54.0 -143.2 3.9474 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.392000 2.160000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.0173 41.0993 4.5 45.2 -50.6 0.1465 2.6 9.8 Cyg X-3
326.1258 38.1789 3.0 39.0 -69.8 0.1635 3.9 8.8 Cyg X-2
273.2644 53.4350 2.2 50.4 -15.6 0.1914 5.1 ------ UNKNOWN
349.3756 43.3713 0.6 24.6 -91.9 0.4085 19.0 ------ UNKNOWN
287.3277 49.9631 2.7 47.7 -27.5 0.1542 4.3 ------ UNKNOWN
9.1287 22.5790 3.0 39.4 -135.0 0.1100 3.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
56.960600 364.260590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5729 35.2063 0.6 38.8 -19.6 5.1028 19.8 0.9 Cyg X-1
308.0998 40.9725 1.1 30.4 -14.9 2.2271 10.5 1.3 Cyg X-3
325.9872 38.2019 7.9 18.4 -33.2 0.2829 1.5 11.3 Cyg X-2
299.5404 40.0444 2.1 36.8 -12.4 1.2786 5.5 ------ UNKNOWN
293.0992 19.4464 3.2 52.5 -33.3 2.7764 3.7 ------ UNKNOWN
338.8530 3.3534 3.8 41.1 -98.6 3.8033 3.1 ------ UNKNOWN
Plot creation:
Sun May 31 02:12:09 EDT 2015