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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
232.8338 0.2958 0.0103 24.8540 52.1007 0.7632742 18.646 TRIG_00211957
Foreground time interval of the image:
-1.360 9.933 (delta_t = 11.293 [sec])
Background time interval of the image:
-239.168 -1.360 (delta_t = 237.808 [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 0.512000
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 0.512000
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 0.512000
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
Multiple GTIs in the spectrum
tstart tstop
-1.360000 79.842100
80.832000 310.172000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96077 ( -0.215901 0.227342 )
Norm@50keV : 4.52427E-04 ( -6.1674e-05 5.92804e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.05 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 57 degrees of freedom
# Null hypothesis probability = 1.925837e-01
Photon flux (15-150 keV) in 310.5 sec: 6.66686E-02 ( -0.00671346 0.00671697 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29324e-06 ( -1.6391e-07 1.68183e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-1.360000 79.842100
80.832000 310.172000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13036 ( )
Epeak [keV] : 54.7067 ( )
Norm@50keV : 3.54129E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.21 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 56 degrees of freedom
# Null hypothesis probability = 2.109898e-01
Photon flux (15-150 keV) in 310.5 sec: 6.66281E-02 ( -0.0066795 0.0067103 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2874e-06 ( -1.56712e-07 1.5679e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-1.360000 79.842100
80.832000 310.172000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51798 ( 1.51949 1.51949 )
beta : -1.96051 ( -0.248307 0.215784 )
Epeak [keV] : 14.0866 ( -13.6202 -13.6202 )
Norm@50keV : 1.28126E-03 ( -0.00129199 0.00355244 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.05 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 55 degrees of freedom
# Null hypothesis probability = 1.461424e-01
Photon flux (15-150 keV) in 310.5 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] : 8.09078 ( )
R^2/D10^2 : 6.35871E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 117.55 using 59 PHA bins.
# Reduced chi-squared = 2.0624 for 57 degrees of freedom
# Null hypothesis probability = 4.276645e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.356e-07 4.932e-08
25- 50 4.206e-07 6.676e-08
50-150 1.146e-07 4.286e-08
15-150 7.708e-07 1.275e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 83.8727 (-29.3943 61.0568)
Norm : 0.300063 (-0.0474493 0.0654693)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.41 using 59 PHA bins.
# Reduced chi-squared = 1.305 for 57 degrees of freedom
# Null hypothesis probability = 6.055912e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.424e-07 3.647e-08
25- 50 4.036e-07 4.580e-08
50-150 5.877e-07 2.644e-07
15-150 1.234e-06 3.044e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.88859 (-0.748236 0.865926)
R1^2/D10^2 : 0.423597 (-0.215108 0.478244)
kT2 [keV] : 28.4794 (-6.96855 12.9215)
R2^2/D10^2 : 5.61171E-04 (-0.000372247 0.00083582)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.15 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 55 degrees of freedom
# Null hypothesis probability = 4.315868e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.148e-07 1.170e-07
25- 50 3.180e-07 9.146e-08
50-150 8.100e-07 4.551e-07
15-150 1.443e-06 4.987e-07
Peak spectrum fit
Power-law model
Time interval is from 0.144 sec. to 1.144 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29997 ( -0.168861 0.168911 )
Norm@50keV : 1.39663E-02 ( -0.00142914 0.00142761 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.11 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 57 degrees of freedom
# Null hypothesis probability = 1.139140e-01
Photon flux (15-150 keV) in 1 sec: 1.66621 ( -0.172497 0.172704 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38013e-07 ( -1.56888e-08 1.5822e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.144 sec. to 1.144 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.336056 ( -0.92838 0.757631 )
Epeak [keV] : 89.7918 ( -22.1984 128.223 )
Norm@50keV : 4.12090E-02 ( -0.0232476 0.0722748 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.21 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 56 degrees of freedom
# Null hypothesis probability = 1.871355e-01
Photon flux (15-150 keV) in 1 sec: 1.60521 ( -0.18073 0.17958 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29933e-07 ( -1.7227e-08 1.7295e-08 ) ergs/cm2
Band function
Time interval is from 0.144 sec. to 1.144 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.153815 ( -0.927402 2.53461 )
beta : -2.02961 ( 2.02769 0.64242 )
Epeak [keV] : 80.0206 ( -38.5248 119.18 )
Norm@50keV : 5.23531E-02 ( -0.0527775 2.46606 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.12 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 55 degrees of freedom
# Null hypothesis probability = 1.651166e-01
Photon flux (15-150 keV) in 1 sec: 1.60125 ( 5.39875 -0.18035 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30194e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.8204 (-1.90501 2.22507)
R^2/D10^2 : 0.137483 (-0.0474881 0.0696114)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.48 using 59 PHA bins.
# Reduced chi-squared = 1.289 for 57 degrees of freedom
# Null hypothesis probability = 6.987515e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.945e-09 1.532e-09
25- 50 3.485e-08 5.160e-09
50-150 7.016e-08 1.276e-08
15-150 1.130e-07 1.562e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 6.89314 (-0.705735 0.705706)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.66 using 59 PHA bins.
# Reduced chi-squared = 1.292 for 57 degrees of freedom
# Null hypothesis probability = 6.793333e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.716e-08 5.515e-09
25- 50 3.302e-08 1.731e-08
50-150 7.241e-08 3.935e-08
15-150 1.226e-07 5.764e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.44592 (-7.36691 -8.53789)
R1^2/D10^2 : 0.622429 (-0.429964 0)
kT2 [keV] : 23.9883 (-7.70592 -24.4177)
R2^2/D10^2 : 3.20451E-02 (-0.0291323 0.112264)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.12 using 59 PHA bins.
# Reduced chi-squared = 1.202 for 55 degrees of freedom
# Null hypothesis probability = 1.449309e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.161e-08 6.500e-09
25- 50 3.416e-08 1.814e-08
50-150 8.291e-08 4.440e-08
15-150 1.287e-07 6.610e-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: 1.61819 ( -0.159298 0.1624 )
Norm@50keV : 4.09856E-03 ( -0.000389843 0.000384946 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.28 using 59 PHA bins.
# Reduced chi-squared = 0.7242 for 57 degrees of freedom
# Null hypothesis probability = 9.418893e-01
Photon flux (15-150 keV) in 11.29 sec: 0.529695 ( -0.0466504 0.0466948 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.31822e-07 ( -4.41577e-08 4.47058e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58957 ( )
Epeak [keV] : 684.775 ( )
Norm@50keV : 4.24386E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.27 using 59 PHA bins.
# Reduced chi-squared = 0.7370 for 56 degrees of freedom
# Null hypothesis probability = 9.295187e-01
Photon flux (15-150 keV) in 11.29 sec: 0.528456 ( -0.048112 0.047687 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.30007e-07 ( -4.85188e-08 4.62867e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22011 ( 1.21851 6.21284 )
beta : -1.62622 ( 1.63028 0.169034 )
Epeak [keV] : 45.9480 ( -45.0763 -45.0763 )
Norm@50keV : 8.30571E-03 ( -0.00522275 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.20 using 59 PHA bins.
# Reduced chi-squared = 0.7491 for 55 degrees of freedom
# Null hypothesis probability = 9.162532e-01
Photon flux (15-150 keV) in 11.29 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) = 3.85e-07
S(50-100 keV) = 3.95e-07
T90 vs. Hardness ratio plot
T90 = 298.040000021458 sec.
Hardness ratio (energy fluence ratio) = 1.02597
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.779961
Count Ratio (50-100 keV) / (15-25 keV) = 0.631581
Mask shadow pattern
IMX = 2.845381887767856E-01, IMY = -3.655144875083937E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-239.168000 -1.360000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.2914 35.3213 84.8 51.8 -0.4 0.0563 0.1 8.2 Her X-1
166.0482 -30.8355 2.7 54.2 177.0 2.4392 4.2 ------ UNKNOWN
214.0225 55.7399 2.7 50.7 -44.5 3.4892 4.2 ------ UNKNOWN
206.6188 53.5641 3.0 48.4 -50.0 3.3319 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.360000 9.932600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5850 35.2875 4.6 52.0 -0.2 0.2192 2.5 7.1 Her X-1
232.8338 0.2957 0.6 24.9 52.1 0.7633 18.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
59.332650 79.842100
80.832000 962.923200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9741 -15.6363 0.2 19.9 78.6 31.0780 50.4 0.4 Sco X-1
254.6990 35.2475 0.0 40.5 -37.1 0.9651 1.1 13.1 Her X-1
262.9527 -24.7708 5.6 38.4 67.9 3.3680 2.1 3.4 GX 1+4
268.3854 -1.5452 2.5 35.6 28.0 3.5794 4.6 5.7 SW J1753.5-0127
274.0269 -14.0600 3.0 43.2 46.1 5.6933 3.9 1.9 GX 17+2
Plot creation:
Sun May 31 13:02:52 EDT 2015