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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
339.2389 56.8854 0.0060 44.4231 179.6627 9.2327542 32.052 TRIG_00373674
Foreground time interval of the image:
-15.204 134.984 (delta_t = 150.188 [sec])
Background time interval of the image:
-237.363 -15.204 (delta_t = 222.159 [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 1.024000
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 1.024000
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 1.024000
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 -15.204 sec. to 134.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20592 ( -0.0800151 0.0790486 )
Norm@50keV : 3.93259E-03 ( -0.00017143 0.000170644 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.58 using 59 PHA bins.
# Reduced chi-squared = 0.7997 for 57 degrees of freedom
# Null hypothesis probability = 8.614815e-01
Photon flux (15-150 keV) in 150.2 sec: 0.461994 ( -0.0218751 0.0219544 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.98266e-06 ( -2.62395e-07 2.6287e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.204 sec. to 134.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20131 ( -0.135427 0.129975 )
Epeak [keV] : 9999.12 ( )
Norm@50keV : 3.95112E-03 ( -0.000169037 0.000574503 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.66 using 59 PHA bins.
# Reduced chi-squared = 0.8153 for 56 degrees of freedom
# Null hypothesis probability = 8.367020e-01
Photon flux (15-150 keV) in 150.2 sec: 0.461895 ( -0.021812 0.021803 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.98245e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from -15.204 sec. to 134.984 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.937226 ( 0.938233 0.938233 )
beta : -1.20555 ( 1.20591 0.0800214 )
Epeak [keV] : 52.2132 ( -51.3644 473.126 )
Norm@50keV : 7.36385E-03 ( -0.00266334 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.58 using 59 PHA bins.
# Reduced chi-squared = 0.8288 for 55 degrees of freedom
# Null hypothesis probability = 8.133378e-01
Photon flux (15-150 keV) in 150.2 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] : 21.7674 ( )
R^2/D10^2 : 1.55792E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 196.09 using 59 PHA bins.
# Reduced chi-squared = 3.4402 for 57 degrees of freedom
# Null hypothesis probability = 3.675240e-17
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.062e-07 1.990e-08
25- 50 1.083e-06 7.758e-08
50-150 3.834e-06 2.433e-07
15-150 5.124e-06 2.644e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 1.99286 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 115.09 using 59 PHA bins.
# Reduced chi-squared = 2.0191 for 57 degrees of freedom
# Null hypothesis probability = 8.335304e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.454e-07 3.567e-08
25- 50 1.434e-06 6.849e-08
50-150 3.145e-06 1.630e-07
15-150 5.324e-06 2.478e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.46327 (-1.07189 1.18836)
R1^2/D10^2 : 0.236918 (-0.083355 0.139791)
kT2 [keV] : 41.0681 (-6.28161 10.0479)
R2^2/D10^2 : 1.81883E-03 (-0.000828475 0.00118619)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.28 using 59 PHA bins.
# Reduced chi-squared = 0.7506 for 55 degrees of freedom
# Null hypothesis probability = 9.147607e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.374e-07 9.012e-08
25- 50 1.323e-06 1.503e-07
50-150 4.248e-06 6.008e-07
15-150 6.108e-06 7.412e-07
Peak spectrum fit
Power-law model
Time interval is from 0.756 sec. to 1.756 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11344 ( -0.233506 0.228855 )
Norm@50keV : 1.77232E-02 ( -0.00227774 0.00226682 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.52 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 57 degrees of freedom
# Null hypothesis probability = 3.175392e-01
Photon flux (15-150 keV) in 1 sec: 2.05856 ( -0.275669 0.277549 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.84513e-07 ( -2.49464e-08 2.50782e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.756 sec. to 1.756 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.21279 ( -0.971352 0.349916 )
Epeak [keV] : 324.165 ( -494.077 -494.077 )
Norm@50keV : 9.47397E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.28 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 56 degrees of freedom
# Null hypothesis probability = 3.915712e-01
Photon flux (15-150 keV) in 1 sec: 2.04633 ( -0.29104 0.28426 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.84125e-07 ( -2.5355e-08 2.5311e-08 ) ergs/cm2
Band function
Time interval is from 0.756 sec. to 1.756 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.06006 ( 0.822496 2.06006 )
beta : -1.11344 ( -0.228517 0.234156 )
Epeak [keV] : 456.563 ( -456.563 -456.563 )
Norm@50keV : 2.40883 ( -0.309582 0.308094 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.52 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 55 degrees of freedom
# Null hypothesis probability = 2.541321e-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] : 23.7280 (-3.70291 4.70367)
R^2/D10^2 : 5.63525E-02 (-0.0243985 0.0405621)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.18 using 59 PHA bins.
# Reduced chi-squared = 1.266 for 57 degrees of freedom
# Null hypothesis probability = 8.486613e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.662e-09 1.551e-09
25- 50 3.125e-08 6.710e-09
50-150 1.312e-07 2.883e-08
15-150 1.681e-07 3.375e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 8.64052 (-1.1289 1.12878)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.95 using 59 PHA bins.
# Reduced chi-squared = 1.280 for 57 degrees of freedom
# Null hypothesis probability = 7.565458e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.151e-08 1.209e-08
25- 50 4.138e-08 2.315e-08
50-150 9.074e-08 5.055e-08
15-150 1.536e-07 8.370e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.23419 (-1.30291 3.07462)
R1^2/D10^2 : 50.4784 (-48.3147 1427.1)
kT2 [keV] : 27.1599 (-4.67676 7.05761)
R2^2/D10^2 : 3.52569E-02 (-0.0182187 0.0290736)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.86 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 55 degrees of freedom
# Null hypothesis probability = 4.056258e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.915e-08 1.014e-08
25- 50 2.828e-08 7.735e-09
50-150 1.372e-07 3.859e-08
15-150 1.846e-07 4.470e-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: 1.20592 ( -0.0800151 0.0790486 )
Norm@50keV : 3.93259E-03 ( -0.00017143 0.000170644 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.58 using 59 PHA bins.
# Reduced chi-squared = 0.7997 for 57 degrees of freedom
# Null hypothesis probability = 8.614815e-01
Photon flux (15-150 keV) in 150.2 sec: 0.461994 ( -0.0218751 0.0219544 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.98266e-06 ( -2.62395e-07 2.6287e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20131 ( -0.135427 0.129984 )
Epeak [keV] : 9999.12 ( )
Norm@50keV : 3.95112E-03 ( -0.000169037 0.000574503 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.66 using 59 PHA bins.
# Reduced chi-squared = 0.8153 for 56 degrees of freedom
# Null hypothesis probability = 8.367020e-01
Photon flux (15-150 keV) in 150.2 sec: 0.461895 ( -0.021812 0.021803 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.98245e-06 ( 0 0 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.937226 ( 0.938233 0.938233 )
beta : -1.20555 ( 1.20591 0.0800214 )
Epeak [keV] : 52.2132 ( -51.3644 442.937 )
Norm@50keV : 7.36385E-03 ( -0.00266334 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.58 using 59 PHA bins.
# Reduced chi-squared = 0.8288 for 55 degrees of freedom
# Null hypothesis probability = 8.133378e-01
Photon flux (15-150 keV) in 150.2 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) = 1.26e-06
S(50-100 keV) = 2.19e-06
T90 vs. Hardness ratio plot
T90 = 112.27999997139 sec.
Hardness ratio (energy fluence ratio) = 1.7381
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.70791
Count Ratio (50-100 keV) / (15-25 keV) = 1.66144
Mask shadow pattern
IMX = -9.800457962126508E-01, IMY = -5.769424024744253E-03
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
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:
-237.363410 -15.204000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6306 22.0083 0.4 37.6 27.6 8.5473 29.1 0.4 Crab
16.3966 37.5830 3.2 39.2 132.8 1.6668 3.6 ------ UNKNOWN
350.3983 42.1682 2.8 49.4 158.3 2.4888 4.2 ------ UNKNOWN
311.5523 61.1619 2.9 51.2 -162.6 1.6922 3.9 ------ UNKNOWN
129.3917 66.6953 3.0 28.3 -82.1 1.0198 3.8 ------ UNKNOWN
247.8017 74.0727 2.2 47.9 -128.8 4.8481 5.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-15.204000 134.984000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.5139 22.1123 11.8 37.5 27.7 0.2604 1.0 8.9 Crab
339.2389 56.8853 0.4 44.4 179.7 9.2333 32.1 ------ UNKNOWN
334.0666 70.3952 2.2 38.3 -161.7 1.1187 5.2 ------ UNKNOWN
116.1470 35.7524 2.5 38.3 -24.7 1.0329 4.6 ------ UNKNOWN
269.1386 78.7543 2.3 42.7 -134.9 1.5979 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
502.836600 962.676000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4795 35.3439 6.9 56.7 -152.7 2.8194 1.7 1.1 Her X-1
121.3323 34.9005 2.7 41.8 43.1 2.8555 4.2 ------ UNKNOWN
185.4123 34.3527 3.3 18.1 -72.6 0.9885 3.5 ------ UNKNOWN
265.9809 43.8055 2.8 57.6 -167.2 5.3619 4.1 ------ UNKNOWN
178.7650 2.7149 3.0 48.3 -50.0 5.9869 3.8 ------ UNKNOWN
Plot creation:
Sun May 31 02:47:24 EDT 2015