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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
110.8069 9.5077 0.0111 35.8073 120.7639 2.4016122 17.453 TRIG_00158593
Foreground time interval of the image:
-14.352 26.592 (delta_t = 40.944 [sec])
Background time interval of the image:
-299.024 -14.352 (delta_t = 284.672 [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)
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 -14.352 sec. to 26.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50825 ( -0.169317 0.169434 )
Norm@50keV : 3.49179E-03 ( -0.000343347 0.000341874 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.22 using 59 PHA bins.
# Reduced chi-squared = 1.267 for 57 degrees of freedom
# Null hypothesis probability = 8.429894e-02
Photon flux (15-150 keV) in 40.94 sec: 0.436886 ( -0.0433258 0.0434307 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35432e-06 ( -1.44325e-07 1.45424e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.352 sec. to 26.592 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42536 ( )
Epeak [keV] : 338.030 ( )
Norm@50keV : 3.85806E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.28 using 59 PHA bins.
# Reduced chi-squared = 1.291 for 56 degrees of freedom
# Null hypothesis probability = 7.055410e-02
Photon flux (15-150 keV) in 40.94 sec: 0.436760 ( -0.044282 0.043168 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35444e-06 ( -1.59101e-07 1.44616e-07 ) ergs/cm2
Band function
Time interval is from -14.352 sec. to 26.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.51170 ( -4.5117 -4.5117 )
beta : -1.67031 ( -0.229574 0.212644 )
Epeak [keV] : 28.2722 ( -6.19716 5.09248 )
Norm@50keV : 82.0566 ( -7.84074 1.52664e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.86 using 59 PHA bins.
# Reduced chi-squared = 1.270 for 55 degrees of freedom
# Null hypothesis probability = 8.552348e-02
Photon flux (15-150 keV) in 40.94 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] : 13.7997 (-1.8673 2.30628)
R^2/D10^2 : 6.48531E-02 (-0.0273923 0.0447656)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 105.18 using 59 PHA bins.
# Reduced chi-squared = 1.8452 for 57 degrees of freedom
# Null hypothesis probability = 1.076286e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.069e-07 1.973e-08
25- 50 3.920e-07 5.635e-08
50-150 4.879e-07 9.676e-08
15-150 9.868e-07 1.312e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.359 (-63.4048 -199.363)
Norm : 1.78872 (-0.171675 0.171979)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.93 using 59 PHA bins.
# Reduced chi-squared = 1.279 for 57 degrees of freedom
# Null hypothesis probability = 7.592373e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.824e-07 5.156e-08
25- 50 3.508e-07 1.765e-07
50-150 7.693e-07 3.900e-07
15-150 1.302e-06 5.474e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.06243 (-1.43372 1.67138)
R1^2/D10^2 : 0.338636 (-0.158504 0.319058)
kT2 [keV] : 40.0134 (-13.0913 52.9859)
R2^2/D10^2 : 1.39025E-03 (-0.00119712 0.00344312)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.50 using 59 PHA bins.
# Reduced chi-squared = 1.209 for 55 degrees of freedom
# Null hypothesis probability = 1.377591e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.756e-07 6.284e-08
25- 50 3.709e-07 1.218e-07
50-150 8.452e-07 4.312e-07
15-150 1.392e-06 5.339e-07
Peak spectrum fit
Power-law model
Time interval is from 3.236 sec. to 4.236 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34381 ( -0.277147 0.273102 )
Norm@50keV : 1.39827E-02 ( -0.00233849 0.00233307 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.76 using 59 PHA bins.
# Reduced chi-squared = 0.7151 for 57 degrees of freedom
# Null hypothesis probability = 9.486049e-01
Photon flux (15-150 keV) in 1 sec: 1.68239 ( -0.288327 0.289262 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36756e-07 ( -2.47664e-08 2.50442e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.236 sec. to 4.236 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.644886 ( -1.3631 0.887729 )
Epeak [keV] : 98.3450 ( -38.4825 -98.3393 )
Norm@50keV : 3.13986E-02 ( -0.0190567 0.116161 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.48 using 59 PHA bins.
# Reduced chi-squared = 0.7051 for 56 degrees of freedom
# Null hypothesis probability = 9.537959e-01
Photon flux (15-150 keV) in 1 sec: 1.64373 ( -0.29471 0.29521 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30603e-07 ( -2.7167e-08 2.6646e-08 ) ergs/cm2
Band function
Time interval is from 3.236 sec. to 4.236 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93037 ( -13.921 -4.93037 )
beta : -1.57699 ( -0.561389 0.35429 )
Epeak [keV] : 30.7862 ( -13.2206 19.5897 )
Norm@50keV : 354.205 ( -58.1004 11103.2 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.89 using 59 PHA bins.
# Reduced chi-squared = 0.6890 for 55 degrees of freedom
# Null hypothesis probability = 9.619793e-01
Photon flux (15-150 keV) in 1 sec: 1.65304 ( 5.34696 -0.30081 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32558e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.0999 (-3.14946 4.12153)
R^2/D10^2 : 0.157242 (-0.0855373 0.177181)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.14 using 59 PHA bins.
# Reduced chi-squared = 0.7919 for 57 degrees of freedom
# Null hypothesis probability = 8.719275e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.415e-09 2.681e-09
25- 50 3.560e-08 9.120e-09
50-150 6.465e-08 2.341e-08
15-150 1.087e-07 2.748e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 7.02156 (-1.17299 1.1729)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.44 using 59 PHA bins.
# Reduced chi-squared = 0.7270 for 57 degrees of freedom
# Null hypothesis probability = 9.397126e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.749e-08 1.014e-08
25- 50 3.364e-08 1.914e-08
50-150 7.377e-08 4.213e-08
15-150 1.249e-07 7.070e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.97161 (-3.76193 5.08326)
R1^2/D10^2 : 0.759350 (-0.552963 3.17141)
kT2 [keV] : 32.1953 (-19.2055 -32.2438)
R2^2/D10^2 : 1.06759E-02 (-0.0101809 0.0722871)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.23 using 59 PHA bins.
# Reduced chi-squared = 0.6951 for 55 degrees of freedom
# Null hypothesis probability = 9.584545e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.354e-08 7.765e-09
25- 50 3.563e-08 1.979e-08
50-150 8.405e-08 5.080e-08
15-150 1.332e-07 6.815e-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: 1.50825 ( -0.169317 0.169434 )
Norm@50keV : 3.49179E-03 ( -0.000343347 0.000341874 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.22 using 59 PHA bins.
# Reduced chi-squared = 1.267 for 57 degrees of freedom
# Null hypothesis probability = 8.429894e-02
Photon flux (15-150 keV) in 40.94 sec: 0.436886 ( -0.0433258 0.0434307 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35432e-06 ( -1.44325e-07 1.45424e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42536 ( )
Epeak [keV] : 338.030 ( )
Norm@50keV : 3.85806E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.28 using 59 PHA bins.
# Reduced chi-squared = 1.291 for 56 degrees of freedom
# Null hypothesis probability = 7.055410e-02
Photon flux (15-150 keV) in 40.94 sec: 0.436760 ( -0.044282 0.043168 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35444e-06 ( -1.59101e-07 1.44616e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.51170 ( -4.5117 -4.5117 )
beta : -1.67031 ( -0.229574 0.212644 )
Epeak [keV] : 28.2722 ( -6.19716 5.09248 )
Norm@50keV : 82.0566 ( -7.84074 1.5282e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.86 using 59 PHA bins.
# Reduced chi-squared = 1.270 for 55 degrees of freedom
# Null hypothesis probability = 8.552348e-02
Photon flux (15-150 keV) in 40.94 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) = 3.36e-07
S(50-100 keV) = 4.73e-07
T90 vs. Hardness ratio plot
T90 = 35.4079999625683 sec.
Hardness ratio (energy fluence ratio) = 1.40774
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.55756
Count Ratio (50-100 keV) / (15-25 keV) = 0.981899
Mask shadow pattern
IMX = -3.690049738593683E-01, IMY = -6.199002061498001E-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:
-299.024000 -14.352000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5067 -40.5532 0.6 28.7 1.3 3.7503 18.6 1.0 Vela X-1
170.1383 -60.6775 4.8 53.5 -23.2 1.2309 2.4 6.2 Cen X-3
114.5591 -41.3917 2.7 36.5 27.0 1.0795 4.4 ------ UNKNOWN
138.7870 -48.4440 2.7 36.3 -4.3 0.9812 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-14.352000 26.592000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6917 -40.5130 89.5 28.6 1.0 0.0087 0.1 7.8 Vela X-1
170.0997 -60.5146 0.0 53.4 -23.3 -0.3618 -1.9 9.1 Cen X-3
110.8069 9.5077 0.7 35.8 120.8 2.4010 17.5 ------ UNKNOWN
109.6407 -49.0158 2.0 44.4 22.7 0.7700 5.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
92.276590 303.044100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6322 22.0131 0.3 28.9 112.1 9.0988 38.2 0.1 Crab
135.7248 -40.3974 10.7 54.9 -29.7 0.7952 1.1 13.0 Vela X-1
102.2057 29.1215 2.7 21.2 152.0 0.6769 4.3 ------ UNKNOWN
114.6522 51.4724 2.5 42.1 176.8 1.0316 4.6 ------ UNKNOWN
126.4047 -45.5589 2.8 56.8 -19.7 2.7483 4.1 ------ UNKNOWN
Plot creation:
Sun May 31 15:27:06 EDT 2015