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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
100.1856 -37.0722 0.0023 26.6649 79.5061 27.9825398 83.435 TRIG_00100585
Foreground time interval of the image:
-10.536 145.944 (delta_t = 156.480 [sec])
Background time interval of the image:
-299.280 -10.536 (delta_t = 288.744 [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 -10.536 sec. to 145.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15246 ( -0.0304377 0.0303074 )
Norm@50keV : 1.05568E-02 ( -0.000178385 0.000178021 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.28 using 59 PHA bins.
# Reduced chi-squared = 0.5838 for 57 degrees of freedom
# Null hypothesis probability = 9.949427e-01
Photon flux (15-150 keV) in 156.5 sec: 1.23149 ( -0.0227698 0.0228318 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69951e-05 ( -2.72064e-07 2.72135e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.536 sec. to 145.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01559 ( -0.126634 0.0628034 )
Epeak [keV] : 455.175 ( -185.995 2712.23 )
Norm@50keV : 1.19605E-02 ( -0.00124674 0.00142593 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 29.71 using 59 PHA bins.
# Reduced chi-squared = 0.5305 for 56 degrees of freedom
# Null hypothesis probability = 9.985044e-01
Photon flux (15-150 keV) in 156.5 sec: 1.21881 ( -0.02513 0.02526 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6922e-05 ( -2.82795e-07 2.82326e-07 ) ergs/cm2
Band function
Time interval is from -10.536 sec. to 145.944 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.838098 ( -0.282923 2.26393 )
beta : -1.20586 ( 1.20501 0.0559531 )
Epeak [keV] : 180.072 ( -80.3999 1827.93 )
Norm@50keV : 1.49564E-02 ( -0.00399494 0.0396363 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 29.19 using 59 PHA bins.
# Reduced chi-squared = 0.5307 for 55 degrees of freedom
# Null hypothesis probability = 9.983559e-01
Photon flux (15-150 keV) in 156.5 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] : 22.8464 ( )
R^2/D10^2 : 3.66619E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 648.63 using 59 PHA bins.
# Reduced chi-squared = 11.380 for 57 degrees of freedom
# Null hypothesis probability = 3.036282e-101
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.445e-07 1.909e-08
25- 50 2.943e-06 7.825e-08
50-150 1.148e-05 2.582e-07
15-150 1.496e-05 2.614e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 5.46137 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 637.09 using 59 PHA bins.
# Reduced chi-squared = 11.177 for 57 degrees of freedom
# Null hypothesis probability = 5.967353e-99
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.128e-06 3.834e-08
25- 50 4.094e-06 7.434e-08
50-150 8.979e-06 1.690e-07
15-150 1.520e-05 2.723e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.24372 (-0.710521 0.753603)
R1^2/D10^2 : 0.391444 (-0.0829166 0.112718)
kT2 [keV] : 36.7645 (-2.51679 3.17738)
R2^2/D10^2 : 6.74768E-03 (-0.00157806 0.00178292)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.89 using 59 PHA bins.
# Reduced chi-squared = 0.7617 for 55 degrees of freedom
# Null hypothesis probability = 9.032936e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.228e-06 7.911e-08
25- 50 3.586e-06 1.260e-07
50-150 1.209e-05 4.100e-07
15-150 1.690e-05 4.382e-07
Peak spectrum fit
Power-law model
Time interval is from 35.012 sec. to 36.012 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.901184 ( -0.0705351 0.0699371 )
Norm@50keV : 6.62464E-02 ( -0.00269562 0.00268935 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.42 using 59 PHA bins.
# Reduced chi-squared = 0.7793 for 57 degrees of freedom
# Null hypothesis probability = 8.876615e-01
Photon flux (15-150 keV) in 1 sec: 7.60369 ( -0.309735 0.309842 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.43129e-07 ( -3.30814e-08 3.3147e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 35.012 sec. to 36.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.669458 ( -0.281207 0.210691 )
Epeak [keV] : 339.624 ( )
Norm@50keV : 8.36057E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.19 using 59 PHA bins.
# Reduced chi-squared = 0.7533 for 56 degrees of freedom
# Null hypothesis probability = 9.141764e-01
Photon flux (15-150 keV) in 1 sec: 7.54661 ( -0.31619 0.3162 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.3751e-07 ( -3.4265e-08 3.4138e-08 ) ergs/cm2
Band function
Time interval is from 35.012 sec. to 36.012 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -0.955533 ( -0.0782442 0.0776813 )
Epeak [keV] : 28.6158 ( -5.38962 3.8039 )
Norm@50keV : 1898.68 ( -75.7119 4381.28 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.28 using 59 PHA bins.
# Reduced chi-squared = 0.7142 for 55 degrees of freedom
# Null hypothesis probability = 9.458549e-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] : 24.0183 ( )
R^2/D10^2 : 0.215125 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 134.34 using 59 PHA bins.
# Reduced chi-squared = 2.3569 for 57 degrees of freedom
# Null hypothesis probability = 3.457906e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.201e-08 1.825e-09
25- 50 1.223e-07 7.550e-09
50-150 5.256e-07 2.965e-08
15-150 6.699e-07 3.245e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 29.6431 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 262.99 using 59 PHA bins.
# Reduced chi-squared = 4.6139 for 57 degrees of freedom
# Null hypothesis probability = 3.191277e-28
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.381e-08 3.235e-09
25- 50 1.420e-07 6.400e-09
50-150 3.114e-07 1.355e-08
15-150 5.272e-07 2.400e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.98750 (-1.25199 1.52999)
R1^2/D10^2 : 3.12406 (-1.28009 2.2936)
kT2 [keV] : 35.4912 (-4.06904 6.02999)
R2^2/D10^2 : 5.83111E-02 (-0.022013 0.0269327)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.88 using 59 PHA bins.
# Reduced chi-squared = 0.6706 for 55 degrees of freedom
# Null hypothesis probability = 9.712147e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.630e-08 7.615e-09
25- 50 1.305e-07 1.590e-08
50-150 5.697e-07 6.480e-08
15-150 7.465e-07 8.460e-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: 1.15246 ( -0.0304377 0.0303074 )
Norm@50keV : 1.05568E-02 ( -0.000178385 0.000178021 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.28 using 59 PHA bins.
# Reduced chi-squared = 0.5838 for 57 degrees of freedom
# Null hypothesis probability = 9.949427e-01
Photon flux (15-150 keV) in 156.5 sec: 1.23149 ( -0.0227698 0.0228318 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69951e-05 ( -2.72064e-07 2.72135e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01559 ( -0.126634 0.0628034 )
Epeak [keV] : 455.175 ( -185.995 2712.23 )
Norm@50keV : 1.19605E-02 ( -0.00124674 0.00142593 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 29.71 using 59 PHA bins.
# Reduced chi-squared = 0.5305 for 56 degrees of freedom
# Null hypothesis probability = 9.985044e-01
Photon flux (15-150 keV) in 156.5 sec: 1.21881 ( -0.02513 0.02526 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6922e-05 ( -2.82795e-07 2.82326e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.838098 ( -0.282923 2.26392 )
beta : -1.20586 ( 1.20501 0.0559531 )
Epeak [keV] : 180.072 ( -80.3999 1827.93 )
Norm@50keV : 1.49564E-02 ( -0.00399494 0.0405201 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 29.19 using 59 PHA bins.
# Reduced chi-squared = 0.5307 for 55 degrees of freedom
# Null hypothesis probability = 9.983559e-01
Photon flux (15-150 keV) in 156.5 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) = 3.47e-06
S(50-100 keV) = 6.24e-06
T90 vs. Hardness ratio plot
T90 = 109.060000002384 sec.
Hardness ratio (energy fluence ratio) = 1.79827
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.67252
Count Ratio (50-100 keV) / (15-25 keV) = 1.67593
Mask shadow pattern
IMX = 9.146238536026967E-02, IMY = -4.937803729858381E-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:
-299.280000 -10.536000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5156 -40.5550 0.8 22.5 148.7 2.8536 14.4 0.6 Vela X-1
170.3444 -60.6017 2.8 24.3 -132.4 0.8385 4.2 1.5 Cen X-3
186.6427 -62.7649 0.4 30.4 -121.0 7.1526 30.6 0.5 GX 301-2
123.6603 -36.7281 2.1 24.2 123.7 1.1511 5.5 ------ UNKNOWN
172.6478 -17.7866 3.3 57.0 -179.1 3.6186 3.6 ------ UNKNOWN
127.9382 -78.0187 2.6 17.4 -70.3 0.7825 4.3 ------ UNKNOWN
183.5161 -54.5673 2.4 33.4 -135.8 1.0397 4.7 ------ UNKNOWN
183.5640 -53.3616 2.1 34.1 -137.5 1.3039 5.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-10.536000 145.944000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.2830 -40.5611 5.1 22.4 148.3 0.5455 2.3 11.2 Vela X-1
170.0185 -60.6069 6.2 24.1 -132.5 0.4552 1.8 8.8 Cen X-3
186.6291 -62.8720 680.4 30.3 -120.8 0.0045 0.0 6.2 GX 301-2
100.1856 -37.0722 0.1 26.7 79.5 27.9830 83.6 ------ UNKNOWN
226.0157 -67.6348 3.1 41.0 -98.3 3.1733 3.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
-299.280000 302.787400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4999 -40.5631 0.7 22.5 148.7 6.3132 17.3 1.4 Vela X-1
170.2536 -60.6085 2.6 24.2 -132.4 1.8559 4.5 2.0 Cen X-3
186.6385 -62.7671 0.3 30.4 -121.0 16.3830 34.9 0.5 GX 301-2
100.1870 -37.0735 0.2 26.7 79.5 28.9173 61.2 ------ UNKNOWN
56.8480 -50.9427 2.8 35.0 12.8 2.0170 4.2 ------ UNKNOWN
33.8573 -51.4803 2.9 45.1 -3.2 2.8371 4.0 ------ UNKNOWN
183.4550 -54.6179 3.7 33.3 -135.8 1.4708 3.1 ------ UNKNOWN
Plot creation:
Sun May 31 17:51:19 EDT 2015