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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
47.6065 13.9984 0.0129 47.6792 -21.9723 0.2522194 14.908 TRIG_00570465
Foreground time interval of the image:
0.004 0.320 (delta_t = 0.316 [sec])
Background time interval of the image:
-239.956 0.004 (delta_t = 239.960 [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 0.064000
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 0.064000
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 0.064000
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 0.004 sec. to 0.320 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20452 ( -0.19507 0.195473 )
Norm@50keV : 5.45680E-02 ( -0.00597822 0.00597635 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.51 using 59 PHA bins.
# Reduced chi-squared = 0.8160 for 57 degrees of freedom
# Null hypothesis probability = 8.380601e-01
Photon flux (15-150 keV) in 0.316 sec: 6.40926 ( -0.717936 0.719126 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7472e-07 ( -2.15764e-08 2.17022e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.004 sec. to 0.320 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20007 ( -0.562841 0.24488 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 5.48305E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.52 using 59 PHA bins.
# Reduced chi-squared = 0.8307 for 56 degrees of freedom
# Null hypothesis probability = 8.127764e-01
Photon flux (15-150 keV) in 0.316 sec: 6.41198 ( -0.71995 0.71436 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74428e-07 ( -2.12583e-08 2.19339e-08 ) ergs/cm2
Band function
Time interval is from 0.004 sec. to 0.320 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.890949 ( 0.890846 0.890846 )
beta : -1.20683 ( 1.20686 0.197677 )
Epeak [keV] : 78.5118 ( -78.6598 901.959 )
Norm@50keV : 9.65694E-02 ( -0.0479231 7.90489 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.51 using 59 PHA bins.
# Reduced chi-squared = 0.8457 for 55 degrees of freedom
# Null hypothesis probability = 7.854095e-01
Photon flux (15-150 keV) in 0.316 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] : 19.9031 (-3.22647 3.94437)
R^2/D10^2 : 0.297232 (-0.129651 0.228805)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.09 using 59 PHA bins.
# Reduced chi-squared = 1.265 for 57 degrees of freedom
# Null hypothesis probability = 8.594275e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.186e-09 1.681e-09
25- 50 3.568e-08 5.976e-09
50-150 1.047e-07 2.150e-08
15-150 1.476e-07 2.424e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 26.2601 (-2.93964 2.93953)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.29 using 59 PHA bins.
# Reduced chi-squared = 0.9875 for 57 degrees of freedom
# Null hypothesis probability = 5.017109e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.066e-08 1.145e-08
25- 50 3.974e-08 2.179e-08
50-150 8.716e-08 4.748e-08
15-150 1.476e-07 8.082e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.48744 (-2.24065 2.73086)
R1^2/D10^2 : 4.77446 (-3.04442 10.3775)
kT2 [keV] : 36.3465 (-9.67191 24.0388)
R2^2/D10^2 : 3.77153E-02 (-0.0284255 0.0490388)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.36 using 59 PHA bins.
# Reduced chi-squared = 0.8247 for 55 degrees of freedom
# Null hypothesis probability = 8.198892e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.667e-08 8.713e-09
25- 50 3.693e-08 1.672e-08
50-150 1.263e-07 6.460e-08
15-150 1.798e-07 8.050e-08
Peak spectrum fit
Power-law model
Time interval is from -0.336 sec. to 0.664 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26773 ( -0.258017 0.256151 )
Norm@50keV : 1.81503E-02 ( -0.00264424 0.00264421 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.04 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 57 degrees of freedom
# Null hypothesis probability = 1.503185e-01
Photon flux (15-150 keV) in 1 sec: 2.15303 ( -0.327137 0.328908 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80813e-07 ( -2.86703e-08 2.88792e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.336 sec. to 0.664 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08567 ( )
Epeak [keV] : 31.8322 ( )
Norm@50keV : 4.16004E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.88 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 56 degrees of freedom
# Null hypothesis probability = 1.514160e-01
Photon flux (15-150 keV) in 1 sec: 2.13534 ( -0.33614 0.33683 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79462e-07 ( -2.9795e-08 2.9582e-08 ) ergs/cm2
Band function
Time interval is from -0.336 sec. to 0.664 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.538055 ( 0.533593 0.533593 )
beta : -1.35400 ( 1.35626 0.333114 )
Epeak [keV] : 75.5259 ( -75.529 842.823 )
Norm@50keV : 4.88265E-02 ( -0.0496603 1.32797e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.79 using 59 PHA bins.
# Reduced chi-squared = 1.232 for 55 degrees of freedom
# Null hypothesis probability = 1.154201e-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] : 19.3458 (-3.82977 4.98463)
R^2/D10^2 : 0.107914 (-0.0564598 0.116953)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.94 using 59 PHA bins.
# Reduced chi-squared = 1.402 for 57 degrees of freedom
# Null hypothesis probability = 2.418337e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.886e-09 2.455e-09
25- 50 3.841e-08 1.011e-08
50-150 1.060e-07 2.990e-08
15-150 1.523e-07 3.735e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 8.98680 (-1.32913 1.32895)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.70 using 59 PHA bins.
# Reduced chi-squared = 1.258 for 57 degrees of freedom
# Null hypothesis probability = 9.100811e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.239e-08 1.277e-08
25- 50 4.307e-08 2.430e-08
50-150 9.445e-08 5.255e-08
15-150 1.599e-07 8.945e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.10932 (-2.69679 3.32756)
R1^2/D10^2 : 1.25381 (-0.854007 3.55309)
kT2 [keV] : 35.0129 (-10.8917 32.3234)
R2^2/D10^2 : 1.29152E-02 (-0.0107927 0.0318564)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.13 using 59 PHA bins.
# Reduced chi-squared = 1.202 for 55 degrees of freedom
# Null hypothesis probability = 1.446377e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.730e-08 9.785e-09
25- 50 4.164e-08 2.236e-08
50-150 1.250e-07 6.910e-08
15-150 1.839e-07 9.470e-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: 1.20452 ( -0.19507 0.195473 )
Norm@50keV : 5.45680E-02 ( -0.00597822 0.00597635 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.51 using 59 PHA bins.
# Reduced chi-squared = 0.8160 for 57 degrees of freedom
# Null hypothesis probability = 8.380601e-01
Photon flux (15-150 keV) in 0.316 sec: 6.40926 ( -0.717936 0.719126 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7472e-07 ( -2.15764e-08 2.17022e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20007 ( -0.562841 0.24488 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 5.48305E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.52 using 59 PHA bins.
# Reduced chi-squared = 0.8307 for 56 degrees of freedom
# Null hypothesis probability = 8.127764e-01
Photon flux (15-150 keV) in 0.316 sec: 6.41198 ( -0.71995 0.71436 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74428e-07 ( -2.12583e-08 2.19339e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.890949 ( 0.890846 0.890846 )
beta : -1.20683 ( 1.20686 0.197677 )
Epeak [keV] : 78.5118 ( -78.6598 901.959 )
Norm@50keV : 9.65694E-02 ( -0.0479185 4.10663 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.51 using 59 PHA bins.
# Reduced chi-squared = 0.8457 for 55 degrees of freedom
# Null hypothesis probability = 7.854095e-01
Photon flux (15-150 keV) in 0.316 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) = 3.68e-08
S(50-100 keV) = 6.39e-08
T90 vs. Hardness ratio plot
T90 = 0.283999919891357 sec.
Hardness ratio (energy fluence ratio) = 1.73641
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.53418
Count Ratio (50-100 keV) / (15-25 keV) = 1.52397
Mask shadow pattern
IMX = 1.018415789227998E+00, IMY = 4.108947869760430E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
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:
-239.956000 0.004000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5537 35.2740 8.0 49.5 173.1 0.6405 1.4 4.7 Cyg X-1
308.1330 40.9129 1.7 42.2 179.9 2.0246 6.9 2.6 Cyg X-3
326.2038 38.1812 2.5 28.1 176.9 0.8727 4.5 8.6 Cyg X-2
324.6058 18.1346 2.3 33.0 137.8 1.4011 5.0 ------ UNKNOWN
54.7380 36.1769 4.2 47.0 -53.5 2.4558 2.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.004000 0.320000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.7066 35.1434 15.2 49.4 172.9 -0.0131 -0.8 6.7 Cyg X-1
307.9171 40.9037 102.2 42.4 179.9 -0.0013 -0.1 9.2 Cyg X-3
326.1715 38.3225 495.9 28.2 177.1 0.0002 0.0 0.1 Cyg X-2
300.0769 21.6199 2.3 52.9 156.0 0.1681 5.1 ------ UNKNOWN
47.6066 13.9984 0.8 47.7 -22.0 0.2522 14.9 ------ UNKNOWN
29.4651 47.7826 2.4 30.0 -76.3 0.0565 4.9 ------ UNKNOWN
39.4607 37.6698 2.3 34.7 -54.6 0.0548 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
77.344590 962.164300
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6277 22.0012 0.4 35.1 -94.9 36.4178 32.5 0.9 Crab
29.1837 -15.7740 3.8 34.9 45.7 2.4438 3.0 ------ UNKNOWN
42.0512 1.4076 2.4 13.7 37.7 2.1599 4.7 ------ UNKNOWN
56.8687 -40.6469 2.7 55.3 5.0 9.1436 4.3 ------ UNKNOWN
71.1525 -32.3299 2.8 51.5 -12.0 4.3838 4.2 ------ UNKNOWN
72.6838 -38.1858 2.9 57.2 -9.8 8.0378 4.0 ------ UNKNOWN
87.9906 -27.1115 3.3 56.8 -30.0 10.0322 3.5 ------ UNKNOWN
Plot creation:
Sat May 30 15:35:18 EDT 2015