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Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
135.2980 -40.5246 0.1887 8.2 94.2 0.3686 1.0 TRIG_00500100
------------------------------------------
Foreground time interval of the image:
-181.216 -56.261 (delta_t = 124.955 [sec])
-55.136 85.565 (delta_t = 140.701 [sec])
Background time interval of the image:
-239.136 -181.216 (delta_t = 57.920 [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 26.880000
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 26.880000
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 26.880000
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
The mask-weighted light curves based on cleaned DPHs
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
Multiple GTIs in the spectrum
tstart tstop
-181.216000 -56.261500
-55.136000 380.896000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.42589 ( )
Norm@50keV : 6.72111E-04 ( )
------------------------------------------------------------
# Chi-Squared = 216.11 using 59 PHA bins.
# Reduced chi-squared = 3.7915 for 57 degrees of freedom
# Null hypothesis probability = 2.313291e-20
Photon flux (15-150 keV) in 561 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-181.216000 -56.261500
-55.136000 380.896000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.73874E-03 ( )
------------------------------------------------------------
# Chi-Squared = 973.63 using 59 PHA bins.
# Reduced chi-squared = 17.386 for 56 degrees of freedom
# Null hypothesis probability = 1.332707e-167
Photon flux (15-150 keV) in 561 sec: 0.209796 ( -0.012325 0.012418 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.54864e-06 ( -2.24641e-07 2.26133e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-181.216000 -56.261500
-55.136000 380.896000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.41602 ( -0.709345 1.46024 )
beta : -7.04217 ( 5.75928 0.0893744 )
Epeak [keV] : 22.5976 ( -1.54679 0.706498 )
Norm@50keV : 6.22791 ( -7.2628 39.6495 )
------------------------------------------------------------
# Chi-Squared = 37.88 using 59 PHA bins.
# Reduced chi-squared = 0.6887 for 55 degrees of freedom
# Null hypothesis probability = 9.621416e-01
Photon flux (15-150 keV) in 561 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] : 5.55764 (-0.166509 0.172453)
R^2/D10^2 : 1.19975 (-0.179111 0.210778)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 39.55 using 59 PHA bins.
# Reduced chi-squared = 0.6938 for 57 degrees of freedom
# Null hypothesis probability = 9.620621e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.454e-06 1.456e-07
25- 50 2.061e-06 8.920e-08
50-150 1.364e-07 2.121e-08
15-150 4.651e-06 1.753e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.8752 (-0.822895 0.892144)
Norm : 4.46776 (-0.467567 0.524182)
------------------------------------------------------------
# Chi-Squared = 93.87 using 59 PHA bins.
# Reduced chi-squared = 1.647 for 57 degrees of freedom
# Null hypothesis probability = 1.518474e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.884e-06 1.534e-07
25- 50 1.950e-06 8.527e-08
50-150 3.377e-07 5.167e-08
15-150 5.171e-06 1.905e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.984 ( )
R1^2/D10^2 : 3.56305E-07 (-3.56305e-07 1.66143e-06)
kT2 [keV] : 5.55009 (-0.169515 0.175942)
R2^2/D10^2 : 1.20709 (-0.182746 0.215501)
------------------------------------------------------------
# Chi-Squared = 39.55 using 59 PHA bins.
# Chi-Squared = 39.42 using 59 PHA bins.
# Reduced chi-squared = 0.7191 for 55 degrees of freedom
# Reduced chi-squared = 0.7168 for 55 degrees of freedom
# Null hypothesis probability = 9.422793e-01
# Null hypothesis probability = 9.439711e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.454e-06 8.224e+02
25- 50 2.061e-06 7.635e+03
50-150 1.364e-07 1.856e+05
15-150 4.651e-06 1.783e+05
Peak spectrum fit
Power-law model
Time interval is from 25.356 sec. to 26.356 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.62646 ( -0.370715 0.436147 )
Norm@50keV : 3.05535E-03 ( -0.00100119 0.00103154 )
------------------------------------------------------------
# Chi-Squared = 78.27 using 59 PHA bins.
# Reduced chi-squared = 1.373 for 57 degrees of freedom
# Null hypothesis probability = 3.227554e-02
Photon flux (15-150 keV) in 1 sec: 0.649890 ( -0.114835 0.115068 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.17123e-08 ( -7.20353e-09 7.76502e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 25.356 sec. to 26.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.46030E-02 ( -4.63133 2.25596 )
Epeak [keV] : 23.3133 ( )
Norm@50keV : 0.213145 ( )
------------------------------------------------------------
# Chi-Squared = 74.37 using 59 PHA bins.
# Reduced chi-squared = 1.328 for 56 degrees of freedom
# Null hypothesis probability = 5.080681e-02
Photon flux (15-150 keV) in 1 sec: 0.628285 ( -0.110118 0.110794 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.65718e-08 ( -5.3326e-09 6.3252e-09 ) ergs/cm2
Band function
Time interval is from 25.356 sec. to 26.356 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.944749 ( -2.23374 -0.965868 )
beta : -8.30421 ( 6.56136 16.5578 )
Epeak [keV] : 24.8353 ( -6.43435 4.96248 )
Norm@50keV : 0.900808 ( -0.900822 570.555 )
------------------------------------------------------------
# Chi-Squared = 74.31 using 59 PHA bins.
# Reduced chi-squared = 1.351 for 55 degrees of freedom
# Null hypothesis probability = 4.241588e-02
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] : 6.56755 (-1.0214 1.15442)
R^2/D10^2 : 1.69365 (-0.840326 1.76422)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 74.51 using 59 PHA bins.
# Reduced chi-squared = 1.307 for 57 degrees of freedom
# Null hypothesis probability = 5.959895e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.093e-08 3.413e-09
25- 50 1.319e-08 4.320e-09
50-150 1.725e-09 1.071e-09
15-150 2.584e-08 7.545e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.6816 (-7.62946 12.4347)
Norm : 6.34906 (-2.03494 3.25504)
------------------------------------------------------------
# Chi-Squared = 75.57 using 59 PHA bins.
# Reduced chi-squared = 1.326 for 57 degrees of freedom
# Null hypothesis probability = 5.041119e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.153e-08 2.745e-09
25- 50 1.172e-08 3.193e-09
50-150 4.891e-09 3.372e-09
15-150 2.814e-08 8.400e-09
Double BB
R1^2/D10^2 : 1.88797 ( )
kT2 [keV] : 185.156 ( )
R2^2/D10^2 : 3.18275E-05 (-3.13761e-05 2.76627)
------------------------------------------------------------
# Chi-Squared = 73.31 using 59 PHA bins.
# Chi-Squared = 73.20 using 59 PHA bins.
# Chi-Squared = 73.12 using 59 PHA bins.
# Reduced chi-squared = 1.333 for 55 degrees of freedom
# Reduced chi-squared = 1.331 for 55 degrees of freedom
# Reduced chi-squared = 1.329 for 55 degrees of freedom
# Null hypothesis probability = 5.003242e-02
# Null hypothesis probability = 5.095351e-02
# Null hypothesis probability = 5.156734e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.087e-08 5.855e-09
25- 50 1.320e-08 7.715e-09
50-150 2.226e-09 1.581e-09
15-150 2.630e-08 1.484e-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: 3.30014 ( )
Norm@50keV : 7.40685E-04 ( )
------------------------------------------------------------
# Chi-Squared = 183.00 using 59 PHA bins.
# Reduced chi-squared = 3.2105 for 57 degrees of freedom
# Null hypothesis probability = 3.940365e-15
Photon flux (15-150 keV) in 265.7 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.18268E-03 ( )
------------------------------------------------------------
# Chi-Squared = 659.20 using 59 PHA bins.
# Reduced chi-squared = 11.771 for 56 degrees of freedom
# Null hypothesis probability = 6.957564e-104
Photon flux (15-150 keV) in 265.7 sec: 0.217249 ( -0.013647 0.013705 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22597e-06 ( -1.22488e-07 1.23519e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.01437 ( -0.982145 1.64638 )
beta : -7.44036 ( 5.73984 0.201329 )
Epeak [keV] : 23.0432 ( -1.59673 0.901766 )
Norm@50keV : 17.3819 ( -17.3842 119.726 )
------------------------------------------------------------
# Chi-Squared = 54.90 using 59 PHA bins.
# Reduced chi-squared = 0.9982 for 55 degrees of freedom
# Null hypothesis probability = 4.783557e-01
Photon flux (15-150 keV) in 265.7 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) =
S(50-100 keV) =
T90 vs. Hardness ratio plot
T90 = 451.199999988079 sec.
Hardness ratio (energy fluence ratio) =
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.610084
Count Ratio (50-100 keV) / (15-25 keV) = 0.0295133
Mask shadow pattern
IMX = -1.062384972716201E-02, IMY = -1.437822354218976E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 26.880000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 26.880000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 26.880000
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:
-239.136000 -181.216000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5508 -40.5370 1.1 8.2 92.9 0.7602 10.3 1.5 Vela X-1
170.3024 -60.6408 7.2 35.9 61.3 0.2768 1.6 1.1 Cen X-3
80.2046 -14.8589 2.3 53.6 -175.6 1.1266 5.0 ------ UNKNOWN
97.7864 -14.8656 2.2 39.0 -163.4 0.5594 5.2 ------ UNKNOWN
108.6435 7.7593 2.2 48.0 -129.0 1.7078 5.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-181.216000 -56.261500
-55.136000 85.564600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.3339 -40.5314 9.5 8.2 94.0 0.4275 1.2 9.0 Vela X-1
170.5694 -60.5893 19.0 36.0 61.1 -0.5024 -0.6 7.7 Cen X-3
136.7503 -40.5380 1.8 8.2 86.5 2.2363 6.3 ------ UNKNOWN
74.7175 -16.8541 2.7 57.3 179.1 8.7450 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
113.764600 422.917900
540.864000 602.967300
780.864000 842.975200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5261 -40.5599 0.3 0.0 122.4 11.0134 42.7 0.3 Vela X-1
170.5311 -60.6257 8.0 29.3 48.0 0.5068 1.4 6.3 Cen X-3
186.6195 -62.8008 2.9 37.2 47.0 2.0748 4.0 2.1 GX 301-2
148.8314 -37.5011 2.3 10.7 -19.1 1.2934 4.9 ------ UNKNOWN
103.7570 -24.2947 2.3 31.1 -165.3 1.3807 5.1 ------ UNKNOWN
176.8598 -14.1910 2.7 44.5 -31.1 2.1653 4.3 ------ UNKNOWN
Plot creation:
Fri Aug 12 13:35:25 EDT 2011