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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
332.0824 6.8438 0.0212 42.4819 -171.4140 0.6596626 9.071 TRIG_00335715
Foreground time interval of the image:
-10.712 8.536 (delta_t = 19.248 [sec])
Background time interval of the image:
-239.192 -10.712 (delta_t = 228.480 [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 8.192000
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 8.192000
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 8.192000
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 -10.712 sec. to 8.536 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04359 ( -0.289721 0.317987 )
Norm@50keV : 2.25716E-03 ( -0.000452062 0.00043018 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.93 using 59 PHA bins.
# Reduced chi-squared = 0.8584 for 57 degrees of freedom
# Null hypothesis probability = 7.677471e-01
Photon flux (15-150 keV) in 19.25 sec: 0.345541 ( -0.0500296 0.0500498 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.0178e-07 ( -7.16281e-08 7.37741e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.712 sec. to 8.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12896 ( )
Epeak [keV] : 64.7133 ( )
Norm@50keV : 1.99636E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.75 using 59 PHA bins.
# Reduced chi-squared = 0.8706 for 56 degrees of freedom
# Null hypothesis probability = 7.430814e-01
Photon flux (15-150 keV) in 19.25 sec: 0.345662 ( -0.050369 0.049884 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.02265e-07 ( -3.63863e-08 7.15503e-08 ) ergs/cm2
Band function
Time interval is from -10.712 sec. to 8.536 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.893659 ( 1.17773 1.17773 )
beta : -2.09041 ( 2.06321 0.305686 )
Epeak [keV] : 20.6754 ( -21.2406 -21.2406 )
Norm@50keV : 0.565404 ( -0.551299 643.24 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.82 using 59 PHA bins.
# Reduced chi-squared = 0.8876 for 55 degrees of freedom
# Null hypothesis probability = 7.084555e-01
Photon flux (15-150 keV) in 19.25 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] : 8.31515 (-1.90065 2.94651)
R^2/D10^2 : 0.304513 (-0.298745 0.555329)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.77 using 59 PHA bins.
# Reduced chi-squared = 1.242 for 57 degrees of freedom
# Null hypothesis probability = 1.038926e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.531e-08 2.089e-08
25- 50 1.408e-07 4.061e-08
50-150 4.191e-08 2.026e-08
15-150 2.580e-07 6.606e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 68.9707 (-27.791 62.4614)
Norm : 1.67942 (-0.37805 0.542978)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.88 using 59 PHA bins.
# Reduced chi-squared = 0.9101 for 57 degrees of freedom
# Null hypothesis probability = 6.671731e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.281e-08 1.574e-08
25- 50 1.312e-07 2.326e-08
50-150 1.667e-07 8.963e-08
15-150 3.807e-07 9.519e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.72970 (-1.08453 1.3598)
R1^2/D10^2 : 2.47016 (-1.63162 3.19387)
kT2 [keV] : 23.1389 (-6.64541 12.6282)
R2^2/D10^2 : 5.24377E-03 (-0.00401509 0.00790489)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.62 using 59 PHA bins.
# Reduced chi-squared = 0.8294 for 55 degrees of freedom
# Null hypothesis probability = 8.123181e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.019e-07 5.496e-08
25- 50 1.055e-07 5.080e-08
50-150 2.142e-07 1.309e-07
15-150 4.215e-07 1.998e-07
Peak spectrum fit
Power-law model
Time interval is from -4.592 sec. to -3.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28805 ( -0.620107 0.803295 )
Norm@50keV : 4.04305E-03 ( -0.00201273 0.00191088 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.35 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 57 degrees of freedom
# Null hypothesis probability = 1.856650e-01
Photon flux (15-150 keV) in 1 sec: 0.701891 ( -0.212375 0.212436 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85513e-08 ( -1.46609e-08 1.61927e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.592 sec. to -3.592 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.37567 ( -2.32844 0.0329405 )
Epeak [keV] : 176.247 ( )
Norm@50keV : 3.57619E-03 ( -0.00362764 0.671225 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.34 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 56 degrees of freedom
# Null hypothesis probability = 1.622939e-01
Photon flux (15-150 keV) in 1 sec: 0.701423 ( -0.21205 0.211905 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.84141e-08 ( -1.59998e-08 1.63287e-08 ) ergs/cm2
Band function
Time interval is from -4.592 sec. to -3.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.00814 ( 2.00814 2.00814 )
beta : -2.28805 ( -0.80297 0.620187 )
Epeak [keV] : 0.203134 ( -0.203134 -0.203134 )
Norm@50keV : 0.549509 ( 0.822496 -0.549509 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.35 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 55 degrees of freedom
# Null hypothesis probability = 1.403962e-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] : 6.38933 (-2.16572 4.29511)
R^2/D10^2 : 1.84359 (-1.82353 9.53331)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.68 using 59 PHA bins.
# Reduced chi-squared = 1.222 for 57 degrees of freedom
# Null hypothesis probability = 1.208968e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.089e-08 6.770e-09
25- 50 1.241e-08 7.765e-09
50-150 1.461e-09 1.285e-09
15-150 2.476e-08 1.570e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 41.3921 (-25.3025 112.953)
Norm : 4.39362 (-2.05664 6.06726)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.99 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 57 degrees of freedom
# Null hypothesis probability = 1.716452e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.020e-08 6.064e-09
25- 50 1.362e-08 7.949e-09
50-150 1.093e-08 8.344e-09
15-150 3.476e-08 2.215e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.63740 (-1.98869 2.82599)
R1^2/D10^2 : 6.07285 (-5.24206 79.2676)
kT2 [keV] : 21.4566 (-18.8077 -21.4592)
R2^2/D10^2 : 1.13450E-02 (-0.0113139 0.357844)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.46 using 59 PHA bins.
# Reduced chi-squared = 1.190 for 55 degrees of freedom
# Null hypothesis probability = 1.579968e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.180e-08 7.325e-09
25- 50 1.093e-08 6.080e-09
50-150 1.766e-08 1.169e-08
15-150 4.039e-08 2.143e-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: 2.04359 ( -0.289721 0.317987 )
Norm@50keV : 2.25716E-03 ( -0.000452062 0.00043018 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.93 using 59 PHA bins.
# Reduced chi-squared = 0.8584 for 57 degrees of freedom
# Null hypothesis probability = 7.677471e-01
Photon flux (15-150 keV) in 19.25 sec: 0.345541 ( -0.0500296 0.0500498 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.0178e-07 ( -7.16281e-08 7.37741e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12896 ( )
Epeak [keV] : 64.7133 ( )
Norm@50keV : 1.99636E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.75 using 59 PHA bins.
# Reduced chi-squared = 0.8706 for 56 degrees of freedom
# Null hypothesis probability = 7.430814e-01
Photon flux (15-150 keV) in 19.25 sec: 0.345662 ( -0.050369 0.049884 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.02265e-07 ( -3.63863e-08 7.15503e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.893659 ( 1.17773 1.17773 )
beta : -2.09041 ( 2.06321 0.305686 )
Epeak [keV] : 20.6754 ( -21.2406 -21.2406 )
Norm@50keV : 0.565404 ( -0.551299 643.21 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.82 using 59 PHA bins.
# Reduced chi-squared = 0.8876 for 55 degrees of freedom
# Null hypothesis probability = 7.084555e-01
Photon flux (15-150 keV) in 19.25 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) = 1.22e-07
S(50-100 keV) = 1.19e-07
T90 vs. Hardness ratio plot
T90 = 17.3000000119209 sec.
Hardness ratio (energy fluence ratio) = 0.97541
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.78988
Count Ratio (50-100 keV) / (15-25 keV) = 0.596097
Mask shadow pattern
IMX = -9.054860239403703E-01, IMY = 1.367151129898282E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
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:
-239.192000 -10.712000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5958 35.2016 0.3 22.2 -97.4 8.2143 38.9 0.3 Cyg X-1
308.0861 40.8143 7.9 13.5 -98.9 0.2656 1.5 8.4 Cyg X-3
326.1306 38.2875 3.2 10.6 -169.9 0.6907 3.6 2.8 Cyg X-2
333.9836 53.1449 2.6 7.9 73.2 0.7471 4.4 ------ UNKNOWN
278.0933 27.2273 3.1 41.0 -83.6 2.9663 3.8 ------ UNKNOWN
298.0759 8.3950 2.0 45.7 -122.3 4.7971 5.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-10.712000 8.536000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5434 35.2406 15.1 22.2 -97.2 -0.0428 -0.8 3.3 Cyg X-1
307.8582 41.0059 4.9 13.5 -97.8 -0.1089 -2.4 11.9 Cyg X-3
325.9791 38.3061 4.9 10.5 -169.2 -0.1010 -2.4 9.1 Cyg X-2
53.2118 70.7070 2.1 44.7 49.2 1.0952 5.6 ------ UNKNOWN
16.0232 63.5023 2.2 31.6 63.6 0.3982 5.2 ------ UNKNOWN
332.0824 6.8438 1.3 42.5 -171.4 0.6597 9.1 ------ UNKNOWN
317.9253 -6.2731 2.3 55.2 -152.0 0.9820 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
111.108600 784.239000
785.808000 962.864000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.7508 10.9009 1.8 43.0 -60.0 10.9442 6.3 3.9 GRS 1915+105
299.5907 35.2137 0.3 41.1 -20.4 29.8264 44.1 0.7 Cyg X-1
307.9250 41.0283 28.6 40.4 -7.1 -0.2908 -0.4 9.5 Cyg X-3
326.2464 38.2327 7.5 31.8 12.7 0.8127 1.5 6.4 Cyg X-2
350.9950 40.6969 2.8 37.8 45.0 3.8214 4.2 ------ UNKNOWN
340.8826 12.3138 3.8 10.2 78.6 1.2438 3.1 ------ UNKNOWN
358.5853 -41.5010 3.8 54.1 177.0 6.4730 3.0 ------ UNKNOWN
282.3449 23.2865 3.0 50.5 -44.0 9.6578 3.8 ------ UNKNOWN
Plot creation:
Sun May 31 05:26:43 EDT 2015