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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
264.1959 46.3376 0.0165 39.6577 36.8678 2.0400041 11.659 TRIG_00150314
Foreground time interval of the image:
-4.556 65.061 (delta_t = 69.617 [sec])
Background time interval of the image:
-299.640 -4.556 (delta_t = 295.084 [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 16.384000
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 16.384000
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 16.384000
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 -4.556 sec. to 175.480 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74676 ( -0.164045 0.169071 )
Norm@50keV : 1.14752E-03 ( -0.000120602 0.000118996 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.19 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 57 degrees of freedom
# Null hypothesis probability = 3.954683e-01
Photon flux (15-150 keV) in 180 sec: 0.154978 ( -0.014751 0.0147645 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90631e-06 ( -2.06158e-07 2.08834e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.556 sec. to 175.480 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.994583 ( -0.802598 0.674512 )
Epeak [keV] : 61.7575 ( -13.8866 110.385 )
Norm@50keV : 2.90549E-03 ( -0.00161665 0.00483998 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.50 using 59 PHA bins.
# Reduced chi-squared = 0.9911 for 56 degrees of freedom
# Null hypothesis probability = 4.936525e-01
Photon flux (15-150 keV) in 180 sec: 0.150134 ( -0.015374 0.015369 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79245e-06 ( -2.24908e-07 2.31071e-07 ) ergs/cm2
Band function
Time interval is from -4.556 sec. to 175.480 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.994966 ( -0.645809 0.83132 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 61.7567 ( -13.9062 50.0614 )
Norm@50keV : 2.90388E-03 ( -0.00161502 0.00484754 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.50 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 55 degrees of freedom
# Null hypothesis probability = 4.556868e-01
Photon flux (15-150 keV) in 180 sec: 0.150793 ( 6.84921 -0.015834 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79734e-06 ( -1.79608e-06 -2.31343e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.4289 (-1.33884 1.51484)
R^2/D10^2 : 3.32474E-02 (-0.0114822 0.0173556)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.81 using 59 PHA bins.
# Reduced chi-squared = 1.295 for 57 degrees of freedom
# Null hypothesis probability = 6.646144e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.959e-07 3.765e-08
25- 50 6.422e-07 7.947e-08
50-150 6.103e-07 1.339e-07
15-150 1.448e-06 1.764e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 115.127 (-35.417 60.7423)
Norm : 0.661964 (-0.0773439 0.0985777)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.03 using 59 PHA bins.
# Reduced chi-squared = 0.9830 for 57 degrees of freedom
# Null hypothesis probability = 5.114059e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.108e-07 4.086e-08
25- 50 5.520e-07 6.687e-08
50-150 9.649e-07 4.132e-07
15-150 1.828e-06 4.372e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.75817 (-2.23702 2.749)
R1^2/D10^2 : 0.299178 (-0.192918 1.38136)
kT2 [keV] : 18.4439 (-4.23322 9.69062)
R2^2/D10^2 : 5.99698E-03 (-0.00447561 0.00719174)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.94 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 55 degrees of freedom
# Null hypothesis probability = 4.392803e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.960e-07 1.622e-07
25- 50 5.466e-07 2.842e-07
50-150 8.688e-07 4.877e-07
15-150 1.711e-06 8.591e-07
Peak spectrum fit
Power-law model
Time interval is from 5.472 sec. to 6.472 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63790 ( -0.639598 0.696792 )
Norm@50keV : 5.18440E-03 ( -0.00206756 0.00198049 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.28 using 59 PHA bins.
# Reduced chi-squared = 0.8294 for 57 degrees of freedom
# Null hypothesis probability = 8.172020e-01
Photon flux (15-150 keV) in 1 sec: 0.674278 ( -0.251983 0.253297 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.82767e-08 ( -1.94483e-08 2.00639e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.472 sec. to 6.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.870557 ( -4.15201 1.38407 )
Epeak [keV] : 74.7661 ( -74.8134 -74.8134 )
Norm@50keV : 1.25512E-02 ( -0.0125446 0.90028 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.00 using 59 PHA bins.
# Reduced chi-squared = 0.8393 for 56 degrees of freedom
# Null hypothesis probability = 7.986031e-01
Photon flux (15-150 keV) in 1 sec: 0.654005 ( -0.265211 0.261628 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.64511e-08 ( -1.94833e-08 2.08618e-08 ) ergs/cm2
Band function
Time interval is from 5.472 sec. to 6.472 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.984035 ( -1.68417 3.02735 )
beta : -9.32450 ( 9.36812 19.3681 )
Epeak [keV] : 81.0265 ( -49.2038 -80.8862 )
Norm@50keV : 1.08611E-02 ( -0.0108754 0.0343281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.01 using 59 PHA bins.
# Reduced chi-squared = 0.8547 for 55 degrees of freedom
# Null hypothesis probability = 7.696752e-01
Photon flux (15-150 keV) in 1 sec: 0.657453 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.65145e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.4276 (-5.72766 8.55607)
R^2/D10^2 : 6.91879E-02 (-0.0691879 0.288651)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.21 using 59 PHA bins.
# Reduced chi-squared = 0.8459 for 57 degrees of freedom
# Null hypothesis probability = 7.899172e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.431e-09 2.252e-09
25- 50 1.398e-08 8.730e-09
50-150 2.293e-08 1.595e-08
15-150 4.034e-08 2.585e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 172.222 (-170.136 -170.136)
Norm : 2.76045 (-1.02785 1.73506)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.09 using 59 PHA bins.
# Reduced chi-squared = 0.8261 for 57 degrees of freedom
# Null hypothesis probability = 8.224896e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.996e-09 4.229e-09
25- 50 1.322e-08 7.890e-09
50-150 2.754e-08 1.738e-08
15-150 4.775e-08 3.051e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.74266 (-3.74852 16.2996)
R1^2/D10^2 : 7.63702 (-7.55287 -7.55287)
kT2 [keV] : 18.3210 (-7.26192 -18.329)
R2^2/D10^2 : 3.40413E-02 (-0.0339741 0.190363)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.54 using 59 PHA bins.
# Reduced chi-squared = 0.8462 for 55 degrees of freedom
# Null hypothesis probability = 7.844706e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.260e-09 4.329e-09
25- 50 1.214e-08 6.990e-09
50-150 2.609e-08 1.718e-08
15-150 4.549e-08 2.618e-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: 1.70180 ( -0.174167 0.179099 )
Norm@50keV : 2.18789E-03 ( -0.000249237 0.00024663 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.69 using 59 PHA bins.
# Reduced chi-squared = 0.9771 for 57 degrees of freedom
# Null hypothesis probability = 5.242595e-01
Photon flux (15-150 keV) in 69.62 sec: 0.290759 ( -0.0308898 0.0309261 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41013e-06 ( -1.66879e-07 1.68962e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.481280 ( -0.993948 0.803924 )
Epeak [keV] : 57.7487 ( -10.2087 26.5913 )
Norm@50keV : 9.78980E-03 ( -0.00606885 0.0230588 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.35 using 59 PHA bins.
# Reduced chi-squared = 0.8634 for 56 degrees of freedom
# Null hypothesis probability = 7.563937e-01
Photon flux (15-150 keV) in 69.62 sec: 0.277639 ( -0.032025 0.032049 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28962e-06 ( -1.76194e-07 1.83484e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.481202 ( -0.291785 3.39704 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 57.7375 ( -10.2084 26.5898 )
Norm@50keV : 9.79115E-03 ( -0.00607116 0.023081 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.35 using 59 PHA bins.
# Reduced chi-squared = 0.8791 for 55 degrees of freedom
# Null hypothesis probability = 7.247993e-01
Photon flux (15-150 keV) in 69.62 sec: 0.281100 ( 6.7189 -0.036331 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28916e-06 ( -1.28867e-06 -1.76682e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 5.26e-07
S(50-100 keV) = 6.27e-07
T90 vs. Hardness ratio plot
T90 = 142.851999998093 sec.
Hardness ratio (energy fluence ratio) = 1.19202
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.32672
Count Ratio (50-100 keV) / (15-25 keV) = 0.839914
Mask shadow pattern
IMX = 6.631946392069351E-01, IMY = -4.973582093147902E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
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:
-299.640000 -4.556000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6101 35.3557 7.0 30.9 53.9 0.4625 1.6 7.5 Her X-1
245.6881 73.3097 2.5 47.6 -3.0 1.5541 4.6 ------ UNKNOWN
193.8049 -25.9189 3.6 59.0 -166.1 4.2871 3.2 ------ UNKNOWN
193.6253 3.3901 2.5 34.6 -143.3 1.0385 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-4.556000 65.060620
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4277 35.3928 6.0 30.7 53.8 0.2464 1.9 3.4 Her X-1
264.1959 46.3376 1.0 39.7 36.9 2.0394 11.7 ------ UNKNOWN
265.1180 59.1741 2.9 44.2 18.9 0.7380 4.0 ------ UNKNOWN
185.5177 -5.4571 2.3 46.6 -143.3 0.8885 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
121.860600 302.377600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6241 35.3027 4.1 13.2 -175.3 0.3892 2.8 8.5 Her X-1
268.3057 -1.4565 7.1 47.9 142.7 0.9728 1.6 3.7 SW J1753.5-0127
299.6013 35.1970 0.4 28.7 68.2 6.8749 32.3 0.6 Cyg X-1
308.0904 40.9787 1.6 31.8 51.7 1.6491 7.3 1.8 Cyg X-3
326.0058 38.3233 4.1 45.2 45.2 -1.5135 -2.9 7.8 Cyg X-2
239.0385 6.8079 2.1 45.1 -175.2 1.4055 5.4 ------ UNKNOWN
235.5188 27.9034 3.2 29.1 -151.1 0.5265 3.6 ------ UNKNOWN
213.6398 12.8187 3.5 54.0 -143.2 3.5048 3.4 ------ UNKNOWN
Plot creation:
Sun May 31 16:03:47 EDT 2015