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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
86.3756 18.9070 0.0152 37.2664 -85.2184 4.1386695 12.652 TRIG_00601051
Foreground time interval of the image:
-17.800 85.656 (delta_t = 103.456 [sec])
Background time interval of the image:
-239.000 -17.800 (delta_t = 221.200 [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 -17.800 sec. to 85.656 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73961 ( -0.225637 0.233726 )
Norm@50keV : 2.20125E-03 ( -0.000315447 0.000308157 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.25 using 59 PHA bins.
# Reduced chi-squared = 1.285 for 57 degrees of freedom
# Null hypothesis probability = 7.232391e-02
Photon flux (15-150 keV) in 103.5 sec: 0.296514 ( -0.0376138 0.037644 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10353e-06 ( -3.09289e-07 3.1444e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -17.800 sec. to 85.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71870 ( -0.791713 0.986154 )
Epeak [keV] : 565.826 ( )
Norm@50keV : 2.26051E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.27 using 59 PHA bins.
# Reduced chi-squared = 1.308 for 56 degrees of freedom
# Null hypothesis probability = 6.053123e-02
Photon flux (15-150 keV) in 103.5 sec: 0.296402 ( -0.037273 0.037644 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10228e-06 ( -3.34067e-07 3.12197e-07 ) ergs/cm2
Band function
Time interval is from -17.800 sec. to 85.656 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.34825 ( -4.34823 -4.34823 )
beta : -1.85345 ( -0.333493 0.266194 )
Epeak [keV] : 23.7993 ( -23.7991 5.8293 )
Norm@50keV : 126.751 ( -126.808 28.5285 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.22 using 59 PHA bins.
# Reduced chi-squared = 1.313 for 55 degrees of freedom
# Null hypothesis probability = 5.960863e-02
Photon flux (15-150 keV) in 103.5 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] : 10.8448 (-1.74046 2.20008)
R^2/D10^2 : 0.102008 (-0.0504194 0.0940091)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 92.79 using 59 PHA bins.
# Reduced chi-squared = 1.628 for 57 degrees of freedom
# Null hypothesis probability = 1.922303e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.587e-07 6.784e-08
25- 50 7.181e-07 1.324e-07
50-150 4.718e-07 1.651e-07
15-150 1.449e-06 2.707e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 118.700 (-47.9321 -118.726)
Norm : 1.26250 (-0.195869 0.255508)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.30 using 59 PHA bins.
# Reduced chi-squared = 1.303 for 57 degrees of freedom
# Null hypothesis probability = 6.161271e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.405e-07 6.262e-08
25- 50 6.080e-07 1.394e-07
50-150 1.079e-06 5.649e-07
15-150 2.028e-06 7.634e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.22617 (-1.66995 1.88023)
R1^2/D10^2 : 0.374737 (-0.209175 0.584149)
kT2 [keV] : 37.1842 (-15.3181 121.125)
R2^2/D10^2 : 9.92015E-04 (-0.000940368 0.00386723)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.86 using 59 PHA bins.
# Reduced chi-squared = 1.288 for 55 degrees of freedom
# Null hypothesis probability = 7.365615e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.552e-07 1.423e-07
25- 50 6.175e-07 2.280e-07
50-150 1.211e-06 6.638e-07
15-150 2.184e-06 9.583e-07
Peak spectrum fit
Power-law model
Time interval is from 31.580 sec. to 32.580 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04481 ( -0.540118 0.612332 )
Norm@50keV : 6.04676E-03 ( -0.00241473 0.0023145 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.85 using 59 PHA bins.
# Reduced chi-squared = 1.120 for 57 degrees of freedom
# Null hypothesis probability = 2.484648e-01
Photon flux (15-150 keV) in 1 sec: 0.926216 ( -0.363294 0.363528 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.59189e-08 ( -2.10704e-08 2.10529e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 31.580 sec. to 32.580 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63476 ( -2.51735 1.3316 )
Epeak [keV] : 45.4023 ( )
Norm@50keV : 9.99035E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.74 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 56 degrees of freedom
# Null hypothesis probability = 2.228678e-01
Photon flux (15-150 keV) in 1 sec: 0.932204 ( -0.364705 0.365126 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.66596e-08 ( -2.12647e-08 2.14718e-08 ) ergs/cm2
Band function
Time interval is from 31.580 sec. to 32.580 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97052 ( -7.86584 -4.97052 )
beta : -2.17255 ( -1.55005 0.602141 )
Epeak [keV] : 22.6708 ( -22.6708 60.2818 )
Norm@50keV : 1897.20 ( -691.722 1.55634e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.40 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 55 degrees of freedom
# Null hypothesis probability = 2.044257e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.6391e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.59727 (-4.02539 11.3514)
R^2/D10^2 : 0.523334 (-0.500556 3.66435)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.67 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 57 degrees of freedom
# Null hypothesis probability = 1.574545e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.668e-09 6.330e-09
25- 50 2.265e-08 1.482e-08
50-150 1.048e-08 8.320e-09
15-150 4.280e-08 2.885e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 76.9303 (-43.6887 -76.9303)
Norm : 4.51584 (-2.14168 3.27274)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.80 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 57 degrees of freedom
# Null hypothesis probability = 2.499469e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.169e-08 5.840e-09
25- 50 1.905e-08 1.126e-08
50-150 2.619e-08 2.010e-08
15-150 5.693e-08 3.630e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.65645 (-4.02465 5.43877)
R1^2/D10^2 : 1.71474 (-1.5092 87.7473)
kT2 [keV] : 24.7906 (-11.9256 -24.8625)
R2^2/D10^2 : 8.21195E-03 (-0.00811594 0.134643)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.20 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 55 degrees of freedom
# Null hypothesis probability = 2.092766e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.243e-08 8.120e-09
25- 50 1.929e-08 1.235e-08
50-150 2.467e-08 1.398e-08
15-150 5.639e-08 3.099e-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: 1.73961 ( -0.225637 0.233726 )
Norm@50keV : 2.20125E-03 ( -0.000315447 0.000308157 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.25 using 59 PHA bins.
# Reduced chi-squared = 1.285 for 57 degrees of freedom
# Null hypothesis probability = 7.232391e-02
Photon flux (15-150 keV) in 103.5 sec: 0.296514 ( -0.0376138 0.037644 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10353e-06 ( -3.09289e-07 3.1444e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71870 ( -0.791713 0.986154 )
Epeak [keV] : 565.826 ( )
Norm@50keV : 2.26051E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.27 using 59 PHA bins.
# Reduced chi-squared = 1.308 for 56 degrees of freedom
# Null hypothesis probability = 6.053123e-02
Photon flux (15-150 keV) in 103.5 sec: 0.296402 ( -0.037273 0.037644 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10228e-06 ( -3.34067e-07 3.12197e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.34825 ( -4.34823 -4.34823 )
beta : -1.85345 ( -0.333493 0.266194 )
Epeak [keV] : 23.7993 ( -23.7991 5.8293 )
Norm@50keV : 126.751 ( -126.808 28.5285 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.22 using 59 PHA bins.
# Reduced chi-squared = 1.313 for 55 degrees of freedom
# Null hypothesis probability = 5.960863e-02
Photon flux (15-150 keV) in 103.5 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) = 5.79e-07
S(50-100 keV) = 6.93e-07
T90 vs. Hardness ratio plot
T90 = 94.7680000066757 sec.
Hardness ratio (energy fluence ratio) = 1.19689
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.20259
Count Ratio (50-100 keV) / (15-25 keV) = 0.767954
Mask shadow pattern
IMX = 6.342461359351292E-02, IMY = 7.582216673749773E-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:
-239.000000 -17.800000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5116 -40.5820 2.9 39.9 120.2 2.6803 4.0 1.8 Vela X-1
106.2971 -53.3262 2.5 49.0 151.4 3.7221 4.7 ------ UNKNOWN
76.1788 -50.0803 2.3 55.9 173.6 5.9887 4.9 ------ UNKNOWN
129.3093 52.6510 2.7 58.8 -26.0 5.7659 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-17.800000 85.656000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5006 -40.6800 4.4 40.0 120.3 -1.1724 -2.6 7.6 Vela X-1
124.7505 -31.8752 2.7 28.3 127.3 0.7470 4.2 ------ UNKNOWN
86.3756 18.9070 0.9 37.3 -85.2 4.1414 12.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
341.700600 917.600590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5469 35.2390 7.9 35.8 14.4 -0.7912 -1.5 7.6 Her X-1
197.5679 -18.1973 2.4 46.4 152.8 5.6705 4.9 ------ UNKNOWN
277.4616 45.7238 3.2 53.8 0.8 4.6113 3.5 ------ UNKNOWN
280.0361 51.0117 3.4 55.5 -5.6 4.3165 3.4 ------ UNKNOWN
286.5975 60.8534 3.9 59.6 -17.1 8.1023 3.0 ------ UNKNOWN
160.7685 -2.1915 5.2 58.7 -159.2 7.4794 2.2 ------ UNKNOWN
166.9836 13.5446 3.2 46.0 -145.0 3.5261 3.7 ------ UNKNOWN
165.7098 19.1814 3.7 45.3 -137.0 3.3366 3.1 ------ UNKNOWN
Plot creation:
Sat May 30 13:24:36 EDT 2015