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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
32.0873 56.9553 0.0249 26.5741 -64.4708 1.1612474 7.761 TRIG_00282445
Foreground time interval of the image:
-6.528 72.701 (delta_t = 79.229 [sec])
Background time interval of the image:
-72.099 -12.640 (delta_t = 59.459 [sec])
-12.000 -6.528 (delta_t = 5.472 [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 64.000000
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 64.000000
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 64.000000
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 -6.528 sec. to 602.396 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59279 ( -0.0348116 0.0348039 )
Norm@50keV : 3.45150E-03 ( -5.94145e-05 5.94104e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.68 using 59 PHA bins.
# Reduced chi-squared = 0.6260 for 57 degrees of freedom
# Null hypothesis probability = 9.879358e-01
Photon flux (15-150 keV) in 608.9 sec: 0.442548 ( -0.00913376 0.00917529 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.96721e-05 ( -3.45132e-07 3.45293e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.528 sec. to 602.396 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47135 ( -0.141823 0.13195 )
Epeak [keV] : 245.033 ( -101.299 -245.033 )
Norm@50keV : 3.90456E-03 ( -0.00046737 0.000587946 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.43 using 59 PHA bins.
# Reduced chi-squared = 0.5970 for 56 degrees of freedom
# Null hypothesis probability = 9.928183e-01
Photon flux (15-150 keV) in 608.9 sec: 0.437198 ( -0.010764 0.010535 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95014e-05 ( -3.99865e-07 3.98464e-07 ) ergs/cm2
Band function
Time interval is from -6.528 sec. to 602.396 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.442760 ( -1.49681 4.64285 )
beta : -1.61796 ( 1.61797 0.043538 )
Epeak [keV] : 40.7280 ( -19.3159 101.354 )
Norm@50keV : 1.99534E-02 ( -0.0197118 244.955 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.20 using 59 PHA bins.
# Reduced chi-squared = 0.5855 for 55 degrees of freedom
# Null hypothesis probability = 9.939895e-01
Photon flux (15-150 keV) in 608.9 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] : 16.7741 ( )
R^2/D10^2 : 3.09432E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 704.08 using 59 PHA bins.
# Reduced chi-squared = 12.352 for 57 degrees of freedom
# Null hypothesis probability = 2.628021e-112
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.084e-06 4.201e-08
25- 50 4.743e-06 1.251e-07
50-150 9.487e-06 2.740e-07
15-150 1.531e-05 2.923e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.76654 (-0.0304077 0.0303826)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.85 using 59 PHA bins.
# Reduced chi-squared = 0.6991 for 57 degrees of freedom
# Null hypothesis probability = 9.590164e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.679e-06 5.632e-08
25- 50 5.154e-06 1.096e-07
50-150 1.130e-05 2.436e-07
15-150 1.914e-05 3.775e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.40120 (-0.48611 0.511026)
R1^2/D10^2 : 0.376611 (-0.0795963 0.106756)
kT2 [keV] : 27.6395 (-1.70229 2.03749)
R2^2/D10^2 : 4.30608E-03 (-0.000977737 0.00113874)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.37 using 59 PHA bins.
# Reduced chi-squared = 0.7703 for 55 degrees of freedom
# Null hypothesis probability = 8.937431e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.460e-06 1.641e-07
25- 50 5.202e-06 1.702e-07
50-150 1.152e-05 4.171e-07
15-150 1.918e-05 5.815e-07
Peak spectrum fit
Power-law model
Time interval is from 139.744 sec. to 140.744 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20597 ( -0.131823 0.131122 )
Norm@50keV : 1.63617E-02 ( -0.00118001 0.00117857 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.67 using 59 PHA bins.
# Reduced chi-squared = 0.9064 for 57 degrees of freedom
# Null hypothesis probability = 6.747529e-01
Photon flux (15-150 keV) in 1 sec: 1.92216 ( -0.139935 0.140091 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65719e-07 ( -1.38143e-08 1.39188e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 139.744 sec. to 140.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20745 ( -0.137241 0.127555 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.64026E-02 ( -0.00118028 0.00579194 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.70 using 59 PHA bins.
# Reduced chi-squared = 0.9232 for 56 degrees of freedom
# Null hypothesis probability = 6.381782e-01
Photon flux (15-150 keV) in 1 sec: 1.92166 ( -0.13908 0.13979 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6524e-07 ( -1.3357e-08 1.4802e-08 ) ergs/cm2
Band function
Time interval is from 139.744 sec. to 140.744 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.955203 ( 0.955705 0.955705 )
beta : -1.20595 ( 1.20596 0.131876 )
Epeak [keV] : 56.2805 ( -55.7429 -55.7429 )
Norm@50keV : 2.91913E-02 ( -0.0110183 1.74795 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.67 using 59 PHA bins.
# Reduced chi-squared = 0.9394 for 55 degrees of freedom
# Null hypothesis probability = 6.027983e-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] : 18.5496 (-2.06158 2.39643)
R^2/D10^2 : 0.109625 (-0.0353427 0.0513341)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 111.90 using 59 PHA bins.
# Reduced chi-squared = 1.9631 for 57 degrees of freedom
# Null hypothesis probability = 1.941015e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.477e-09 1.049e-09
25- 50 3.535e-08 4.140e-09
50-150 8.895e-08 1.188e-08
15-150 1.318e-07 1.340e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 7.81727 (-0.572477 0.572453)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.19 using 59 PHA bins.
# Reduced chi-squared = 1.266 for 57 degrees of freedom
# Null hypothesis probability = 8.473305e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.946e-08 1.810e-09
25- 50 3.744e-08 7.350e-09
50-150 8.211e-08 2.907e-08
15-150 1.390e-07 3.851e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.77882 (-1.54011 1.77568)
R1^2/D10^2 : 1.31042 (-0.630298 1.43936)
kT2 [keV] : 39.3706 (-9.56049 22.1852)
R2^2/D10^2 : 8.89263E-03 (-0.00608248 0.0117023)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.12 using 59 PHA bins.
# Reduced chi-squared = 0.9113 for 55 degrees of freedom
# Null hypothesis probability = 6.610518e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.583e-08 3.651e-09
25- 50 3.559e-08 9.095e-09
50-150 1.200e-07 5.254e-08
15-150 1.715e-07 5.781e-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: 1.61054 ( -0.207477 0.211978 )
Norm@50keV : 1.15426E-03 ( -0.000148754 0.000146296 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.15 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 57 degrees of freedom
# Null hypothesis probability = 2.978234e-01
Photon flux (15-150 keV) in 79.23 sec: 0.148816 ( -0.0172909 0.0172971 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.54202e-07 ( -1.18005e-07 1.20537e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41700 ( -0.898176 0.397002 )
Epeak [keV] : 133.775 ( -133.803 -133.803 )
Norm@50keV : 1.47999E-03 ( -0.000467378 0.00322713 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.96 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 56 degrees of freedom
# Null hypothesis probability = 2.718818e-01
Photon flux (15-150 keV) in 79.23 sec: 0.147546 ( -0.01799 0.01793 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.34339e-07 ( -1.43324e-07 1.36252e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.42955 ( -2.50189 -0.566172 )
beta : -1.94055 ( -0.51026 0.347862 )
Epeak [keV] : 35.1045 ( -15.2083 64.328 )
Norm@50keV : 0.122441 ( -0.117629 19.1967 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.95 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 55 degrees of freedom
# Null hypothesis probability = 3.332985e-01
Photon flux (15-150 keV) in 79.23 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) = 5.08e-06
S(50-100 keV) = 6.74e-06
T90 vs. Hardness ratio plot
T90 = 406.875999987125 sec.
Hardness ratio (energy fluence ratio) = 1.32677
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.30848
Count Ratio (50-100 keV) / (15-25 keV) = 0.94223
Mask shadow pattern
IMX = 2.155705603579598E-01, IMY = 4.513608476810955E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
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:
-72.099400 -12.640000
-12.000000 -6.528000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.6007 35.1865 1.7 38.3 84.5 2.0448 6.8 1.0 Cyg X-1
308.0093 41.0477 8.3 30.4 77.7 0.1848 1.4 7.3 Cyg X-3
326.2536 38.1960 5.2 29.3 48.8 0.2601 2.2 8.5 Cyg X-2
154.0719 63.2077 2.1 50.0 -147.3 1.1689 5.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-6.528000 72.700590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5741 35.2888 7.0 38.2 84.6 -0.7692 -1.6 5.3 Cyg X-1
308.0897 40.8970 6.9 30.5 77.5 0.3451 1.7 3.5 Cyg X-3
326.2836 38.3905 5.6 29.1 48.8 0.3728 2.0 6.7 Cyg X-2
295.1181 47.8954 2.3 28.6 100.8 0.9758 5.0 ------ UNKNOWN
316.0377 42.8296 2.4 26.6 67.3 0.8345 4.9 ------ UNKNOWN
359.4151 77.4564 2.7 12.5 -126.9 0.4637 4.2 ------ UNKNOWN
32.0873 56.9554 1.5 26.6 -64.5 1.1615 7.7 ------ UNKNOWN
45.1369 47.9841 2.2 38.5 -64.8 1.3689 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
120.100590 963.083500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
4.5640 34.7136 2.5 29.0 32.7 2.6783 4.7 ------ UNKNOWN
32.1455 56.9444 0.2 0.0 -93.1 31.7945 61.9 ------ UNKNOWN
29.2831 22.8374 2.2 34.2 -14.3 2.7775 5.1 ------ UNKNOWN
156.9474 55.4774 4.1 59.1 -166.1 10.9257 2.8 ------ UNKNOWN
133.7938 60.4484 3.0 47.6 -158.1 3.8949 3.9 ------ UNKNOWN
57.0172 13.9743 5.2 47.0 -53.0 8.2170 3.1 ------ UNKNOWN
57.1927 13.8575 5.8 47.1 -53.1 8.5901 3.2 ------ UNKNOWN
Plot creation:
Sun May 31 09:54:49 EDT 2015