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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
194.3643 28.3315 0.0192 21.5944 126.9027 0.5854731 10.056 TRIG_00597519
Foreground time interval of the image:
-14.192 5.824 (delta_t = 20.016 [sec])
Background time interval of the image:
-239.952 -14.192 (delta_t = 225.760 [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 4.096000
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 4.096000
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 4.096000
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)
The mask-weighted light curves based on cleaned DPHs
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 -14.192 sec. to 5.824 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54063 ( -0.253466 0.260353 )
Norm@50keV : 1.80206E-03 ( -0.000296823 0.000292541 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.98 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 57 degrees of freedom
# Null hypothesis probability = 1.943536e-01
Photon flux (15-150 keV) in 20.02 sec: 0.227517 ( -0.0346032 0.0346153 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.4009e-07 ( -6.0501e-08 6.2091e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.192 sec. to 5.824 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.402625 ( -1.397 1.06912 )
Epeak [keV] : 64.4220 ( -16.7556 196.201 )
Norm@50keV : 7.39445E-03 ( -0.00739445 0.0339624 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.62 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 56 degrees of freedom
# Null hypothesis probability = 2.529433e-01
Photon flux (15-150 keV) in 20.02 sec: 0.217965 ( -0.035504 0.035642 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.06813e-07 ( -6.31451e-08 6.83062e-08 ) ergs/cm2
Band function
Time interval is from -14.192 sec. to 5.824 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.402648 ( -0.971718 1.19596 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 64.4136 ( -15.8523 166.794 )
Norm@50keV : 7.39429E-03 ( -0.00739429 0.00649175 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.62 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 55 degrees of freedom
# Null hypothesis probability = 2.240064e-01
Photon flux (15-150 keV) in 20.02 sec: 0.217948 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.0659e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.4695 (-2.25085 2.76942)
R^2/D10^2 : 3.85458E-02 (-0.0186997 0.0351826)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.24 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 57 degrees of freedom
# Null hypothesis probability = 1.664232e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.966e-08 8.920e-09
25- 50 1.061e-07 2.337e-08
50-150 1.241e-07 3.973e-08
15-150 2.598e-07 6.223e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 174.341 (-85.9481 -174.27)
Norm : 0.939735 (-0.1456 0.169973)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.31 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 57 degrees of freedom
# Null hypothesis probability = 2.360764e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.762e-08 2.667e-08
25- 50 9.010e-08 4.994e-08
50-150 1.886e-07 1.069e-07
15-150 3.263e-07 1.829e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.79089 (-3.63058 4.70455)
R1^2/D10^2 : 0.217251 (-0.169201 3.25179)
kT2 [keV] : 19.8567 (-16.6979 25.9287)
R2^2/D10^2 : 7.42088E-03 (-0.00715319 0.0168463)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.04 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 55 degrees of freedom
# Null hypothesis probability = 2.396925e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.251e-08 2.526e-08
25- 50 9.639e-08 4.932e-08
50-150 1.699e-07 9.373e-08
15-150 3.088e-07 1.645e-07
Peak spectrum fit
Power-law model
Time interval is from 1.300 sec. to 2.300 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43081 ( -0.413228 0.415848 )
Norm@50keV : 5.25272E-03 ( -0.00136553 0.00134933 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.41 using 59 PHA bins.
# Reduced chi-squared = 0.9720 for 57 degrees of freedom
# Null hypothesis probability = 5.350976e-01
Photon flux (15-150 keV) in 1 sec: 0.644295 ( -0.161747 0.161982 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.04491e-08 ( -1.42134e-08 1.47153e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.300 sec. to 2.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.159128 ( -4.36613 2.03831 )
Epeak [keV] : 59.9611 ( -14.5094 -59.7924 )
Norm@50keV : 3.98203E-02 ( -0.0405418 13.0637 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.75 using 59 PHA bins.
# Reduced chi-squared = 0.9598 for 56 degrees of freedom
# Null hypothesis probability = 5.604739e-01
Photon flux (15-150 keV) in 1 sec: 0.608256 ( -0.168852 0.169409 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.26835e-08 ( -1.51252e-08 1.78747e-08 ) ergs/cm2
Band function
Time interval is from 1.300 sec. to 2.300 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.58298 ( -4.58298 -4.58298 )
beta : -2.13476 ( -1.59456 0.763444 )
Epeak [keV] : 37.7780 ( -37.778 11.5977 )
Norm@50keV : 29.0382 ( -7.04936 2.25376e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.00 using 59 PHA bins.
# Reduced chi-squared = 0.9637 for 55 degrees of freedom
# Null hypothesis probability = 5.513809e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.51819e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.1286 (-3.0683 4.53099)
R^2/D10^2 : 0.123394 (-0.080727 0.194598)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.37 using 59 PHA bins.
# Reduced chi-squared = 0.9538 for 57 degrees of freedom
# Null hypothesis probability = 5.744092e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.510e-09 2.215e-09
25- 50 1.570e-08 7.795e-09
50-150 1.720e-08 1.009e-08
15-150 3.741e-08 1.593e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-123.724 -199.363)
Norm : 2.65937 (-0.659823 0.659922)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.95 using 59 PHA bins.
# Reduced chi-squared = 0.9641 for 57 degrees of freedom
# Null hypothesis probability = 5.522732e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.622e-09 4.015e-09
25- 50 1.274e-08 7.655e-09
50-150 2.794e-08 1.643e-08
15-150 4.730e-08 2.821e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.71 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.59 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.57 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.55 using 59 PHA bins.
# Reduced chi-squared = 0.9584 for 55 degrees of freedom
# Reduced chi-squared = 0.9561 for 55 degrees of freedom
# Reduced chi-squared = 0.9559 for 55 degrees of freedom
# Reduced chi-squared = 0.9554 for 55 degrees of freedom
# Null hypothesis probability = 5.624983e-01
# Null hypothesis probability = 5.673930e-01
# Null hypothesis probability = 5.679498e-01
# Null hypothesis probability = 5.689731e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.361e-09 3.510e-09
25- 50 1.515e-08 1.023e-08
50-150 2.683e-08 1.334e-08
15-150 4.734e-08 2.484e-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: 1.54063 ( -0.253466 0.260353 )
Norm@50keV : 1.80206E-03 ( -0.000296823 0.000292541 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.98 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 57 degrees of freedom
# Null hypothesis probability = 1.943536e-01
Photon flux (15-150 keV) in 20.02 sec: 0.227517 ( -0.0346032 0.0346153 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.4009e-07 ( -6.0501e-08 6.2091e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.402625 ( -1.397 1.06912 )
Epeak [keV] : 64.4220 ( -16.7556 196.201 )
Norm@50keV : 7.39445E-03 ( -0.00739445 0.0339624 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.62 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 56 degrees of freedom
# Null hypothesis probability = 2.529433e-01
Photon flux (15-150 keV) in 20.02 sec: 0.217965 ( -0.035504 0.035642 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.06813e-07 ( -6.31451e-08 6.83062e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.402648 ( -0.971718 1.19596 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 64.4136 ( -15.8523 165.656 )
Norm@50keV : 7.39429E-03 ( -0.00739429 0.00649175 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.62 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 55 degrees of freedom
# Null hypothesis probability = 2.240064e-01
Photon flux (15-150 keV) in 20.02 sec: 0.217948 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.0659e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 8.58e-08
S(50-100 keV) = 1.18e-07
T90 vs. Hardness ratio plot
T90 = 17.4240000247955 sec.
Hardness ratio (energy fluence ratio) = 1.37529
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.53893
Count Ratio (50-100 keV) / (15-25 keV) = 1.11182
Mask shadow pattern
IMX = -2.376703540841296E-01, IMY = -3.165160131851645E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-239.952000 -14.192000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5897 35.3312 6.2 43.4 26.9 0.7309 1.9 6.5 Her X-1
174.0863 4.9040 2.2 49.0 151.3 4.0115 5.3 ------ UNKNOWN
146.0869 9.4860 2.6 58.3 -175.5 5.2515 4.5 ------ UNKNOWN
219.4775 84.9582 3.2 35.6 -56.8 1.0836 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-14.192000 5.824000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5765 35.4562 5.1 43.4 26.7 -0.2429 -2.3 9.0 Her X-1
194.3642 28.3315 1.1 21.6 126.9 0.5854 10.1 ------ UNKNOWN
124.6339 48.5901 2.7 45.5 -122.2 0.9024 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
83.148590 271.748610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4450 35.4280 19.5 50.8 5.3 0.2514 0.6 5.2 Her X-1
250.7046 41.9357 2.4 47.2 -2.9 1.4817 4.8 ------ UNKNOWN
138.5426 2.4078 3.3 59.0 -166.1 3.9658 3.5 ------ UNKNOWN
133.8892 19.8263 11.2 55.3 -145.1 1.1857 1.0 ------ UNKNOWN
Plot creation:
Sat May 30 13:43:09 EDT 2015