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Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
40.1004 +61.2041 0.0202 6.4 -30.7 0.0466 9.5 TRIG_00324362
------------------------------------------
Foreground time interval of the image:
0.032 0.300 (delta_t = 0.268 [sec])
Background time interval of the image:
-10.768 0.032 (delta_t = 10.800 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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 0.256000
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 0.256000
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 0.256000
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of 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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.032 sec. to 0.300 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.43075 ( -0.295258 0.334763 )
Norm@50keV : 7.06598E-03 ( -0.00184854 0.00186478 )
------------------------------------------------------------
# Chi-Squared = 69.19 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 57 degrees of freedom
# Null hypothesis probability = 1.290575e-01
Photon flux (15-150 keV) in 0.268 sec: 1.33135 ( -0.224094 0.224401 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.86116e-08 ( -3.83213e-09 4.02571e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.032 sec. to 0.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.72148 ( -3.98334 2.04395 )
Epeak [keV] : 29.1129 ( -4.41081 4.29837 )
Norm@50keV : 4.12991 ( -4.65227 2363.3 )
------------------------------------------------------------
# Chi-Squared = 55.21 using 59 PHA bins.
# Reduced chi-squared = 0.9858 for 56 degrees of freedom
# Null hypothesis probability = 5.049172e-01
Photon flux (15-150 keV) in 0.268 sec: 1.30889 ( -0.21515 0.21582 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57224e-08 ( -2.82644e-09 3.08136e-09 ) ergs/cm2
Band function
Time interval is from 0.032 sec. to 0.300 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.23166 ( -2.44142 -2.32094 )
beta : -9.99842 ( 2005.71 2015.7 )
Epeak [keV] : 29.1974 ( -4.48877 4.15259 )
Norm@50keV : 9.19361 ( -8.6235 314.044 )
------------------------------------------------------------
# Chi-Squared = 55.14 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 55 degrees of freedom
# Null hypothesis probability = 4.692925e-01
Photon flux (15-150 keV) in 0.268 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] : 7.46282 (-0.997896 1.13451)
R^2/D10^2 : 2.17271 (-0.963306 1.72676)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 55.22 using 59 PHA bins.
# Reduced chi-squared = 0.9688 for 57 degrees of freedom
# Null hypothesis probability = 5.421289e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.541e-09 1.577e-09
25- 50 8.564e-09 2.006e-09
50-150 1.779e-09 9.026e-10
15-150 1.588e-08 4.248e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 31.3921 (-8.79303 13.5988)
Norm : 10.7623 (-2.84112 3.94578)
------------------------------------------------------------
# Chi-Squared = 61.74 using 59 PHA bins.
# Reduced chi-squared = 1.083 for 57 degrees of freedom
# Null hypothesis probability = 3.104497e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.004e-09 1.309e-09
25- 50 7.031e-09 1.767e-09
50-150 4.083e-09 2.421e-09
15-150 1.712e-08 4.268e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.46261 (-7.4626 -7.4626)
R1^2/D10^2 : 0.341631 (-0.341657 -0.341657)
kT2 [keV] : 7.46292 (-7.46283 188.722)
R2^2/D10^2 : 1.83101 (-1.83104 -1.83104)
------------------------------------------------------------
# Chi-Squared = 55.22 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Null hypothesis probability = 4.663005e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.541e-09 1.065e+00
25- 50 8.564e-09 8.935e+00
50-150 1.779e-09 2.159e+02
15-150 1.588e-08 2.337e+02
Peak spectrum fit
Power-law model
Time interval is from -0.332 sec. to 0.668 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88638 ( -0.484201 0.557099 )
Norm@50keV : 2.41178E-03 ( -0.000905651 0.000875437 )
------------------------------------------------------------
# Chi-Squared = 50.04 using 59 PHA bins.
# Reduced chi-squared = 0.8779 for 57 degrees of freedom
# Null hypothesis probability = 7.314413e-01
Photon flux (15-150 keV) in 1 sec: 0.344131 ( -0.103476 0.103482 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.21674e-08 ( -7.85026e-09 8.3865e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.332 sec. to 0.668 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.20693 ( -7.5132 2.82492 )
Epeak [keV] : 41.5316 ( -11.3627 27.0968 )
Norm@50keV : 0.156863 ( -0.188263 3686.64 )
------------------------------------------------------------
# Chi-Squared = 46.40 using 59 PHA bins.
# Reduced chi-squared = 0.8286 for 56 degrees of freedom
# Null hypothesis probability = 8.161792e-01
Photon flux (15-150 keV) in 1 sec: 0.320354 ( -0.101923 0.103613 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81222e-08 ( -6.0514e-09 7.8102e-09 ) ergs/cm2
Band function
Time interval is from -0.332 sec. to 0.668 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.62009 ( -2.0879 -1.62009 )
beta : -9.26935 ( 8.35449 18.3494 )
Epeak [keV] : 41.1860 ( -10.6267 22.9444 )
Norm@50keV : 0.272237 ( -0.27276 53.4259 )
------------------------------------------------------------
# Chi-Squared = 46.37 using 59 PHA bins.
# Reduced chi-squared = 0.8431 for 55 degrees of freedom
# Null hypothesis probability = 7.897499e-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] : 10.5873 (-2.49184 3.29721)
R^2/D10^2 : 0.145798 (-0.145798 0.24776)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 46.34 using 59 PHA bins.
# Reduced chi-squared = 0.8130 for 57 degrees of freedom
# Null hypothesis probability = 8.425799e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.385e-09 2.080e-09
25- 50 9.104e-09 5.480e-09
50-150 5.592e-09 4.152e-09
15-150 1.808e-08 1.150e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 69.6302 (-37.1186 -69.7265)
Norm : 1.74303 (-0.589409 0.957758)
------------------------------------------------------------
# Chi-Squared = 48.57 using 59 PHA bins.
# Reduced chi-squared = 0.8521 for 57 degrees of freedom
# Null hypothesis probability = 7.790189e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.469e-09 2.793e-09
25- 50 7.101e-09 4.356e-09
50-150 9.084e-09 7.610e-09
15-150 2.065e-08 1.425e-08
Double BB
R1^2/D10^2 : 9.77123E+07 ( )
kT2 [keV] : 10.7620 (-2.56998 3.44828)
R2^2/D10^2 : 0.135446 (-0.0896063 0.240455)
------------------------------------------------------------
# Chi-Squared = 46.34 using 59 PHA bins.
# Chi-Squared = 46.12 using 59 PHA bins.
# Chi-Squared = 46.09 using 59 PHA bins.
# Reduced chi-squared = 0.8425 for 55 degrees of freedom
# Reduced chi-squared = 0.8386 for 55 degrees of freedom
# Reduced chi-squared = 0.8381 for 55 degrees of freedom
# Null hypothesis probability = 7.907986e-01
# Null hypothesis probability = 7.973347e-01
# Null hypothesis probability = 7.982212e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
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: 2.43075 ( -0.295258 0.334763 )
Norm@50keV : 7.06598E-03 ( -0.00184854 0.00186478 )
------------------------------------------------------------
# Chi-Squared = 69.19 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 57 degrees of freedom
# Null hypothesis probability = 1.290575e-01
Photon flux (15-150 keV) in 0.268 sec: 1.33135 ( -0.224094 0.224401 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.86116e-08 ( -3.83213e-09 4.02571e-09 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.72148 ( -3.98334 2.04395 )
Epeak [keV] : 29.1129 ( -4.41081 4.29837 )
Norm@50keV : 4.12991 ( -4.65227 2363.3 )
------------------------------------------------------------
# Chi-Squared = 55.21 using 59 PHA bins.
# Reduced chi-squared = 0.9858 for 56 degrees of freedom
# Null hypothesis probability = 5.049172e-01
Photon flux (15-150 keV) in 0.268 sec: 1.30889 ( -0.21515 0.21582 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57224e-08 ( -2.82644e-09 3.08136e-09 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.23166 ( -2.44142 -2.32094 )
beta : -9.99842 ( 2005.71 2015.7 )
Epeak [keV] : 29.1974 ( -4.48877 4.15259 )
Norm@50keV : 9.19361 ( -8.6235 314.005 )
------------------------------------------------------------
# Chi-Squared = 55.14 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 55 degrees of freedom
# Null hypothesis probability = 4.692925e-01
Photon flux (15-150 keV) in 0.268 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) = 6.12726e-09
S(50-100 keV) = 4.54842e-09
T90 vs. Hardness ratio plot
T90 = 0.23199999332428 sec.
Hardness ratio (energy fluence ratio) = 0.742325
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.94478
Count Ratio (50-100 keV) / (15-25 keV) = 0.125871
Mask shadow pattern
IMX = 9.713132186622120E-02, IMY = 5.774086747177522E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
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:
-10.768000 0.032000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6614 22.0068 4.2 55.3 -10.7 0.2669 2.8 1.6 Crab
308.1126 40.9520 292.1 49.6 163.8 -0.0034 -0.0 0.1 Cyg X-3
326.1868 38.4370 5.7 43.1 146.4 0.1450 2.0 7.0 Cyg X-2
313.7951 43.2053 2.1 45.2 161.2 0.3620 5.6 ------ UNKNOWN
67.1433 14.1658 2.3 55.6 10.6 0.8335 5.1 ------ UNKNOWN
274.6925 48.0174 3.7 57.5 -167.0 0.4081 3.1 ------ UNKNOWN
87.1414 50.2000 2.1 34.3 -38.5 0.1967 5.6 ------ UNKNOWN
255.1609 69.8799 2.3 44.0 -141.5 0.2726 5.1 ------ UNKNOWN
101.2021 40.9293 2.3 47.8 -40.0 0.3782 5.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.032000 0.300000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.7231 22.0502 5.9 55.3 -10.8 0.0337 1.9 5.4 Crab
308.1208 40.9537 679.0 49.6 163.8 0.0002 0.0 0.5 Cyg X-3
326.3706 38.3211 76.4 43.1 146.1 -0.0018 -0.2 9.4 Cyg X-2
39.9167 28.0267 2.1 34.9 39.5 0.0431 5.7 ------ UNKNOWN
40.1005 61.2042 1.2 6.4 -30.7 0.0466 9.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
908.532600 1006.237200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6355 22.0261 0.7 49.3 -19.9 3.7108 16.6 0.7 Crab
36.0774 67.1212 2.3 6.1 -157.2 0.4402 5.0 ------ UNKNOWN
139.2110 75.3393 2.4 34.0 -116.0 0.8764 4.8 ------ UNKNOWN
244.2706 59.3747 2.9 57.9 -156.8 2.7685 4.0 ------ UNKNOWN
108.0305 39.1835 2.6 46.1 -56.4 1.9319 4.4 ------ UNKNOWN
Plot creation:
Wed Jul 27 14:10:22 EDT 2011