Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
148.6869 -49.4244 0.0140 13.1385 -32.7837 0.1131131 13.636 TRIG_00522578
Foreground time interval of the image:
-0.008 0.568 (delta_t = 0.576 [sec])
Background time interval of the image:
-597.067 -578.595 (delta_t = 18.472 [sec])
-239.168 -0.008 (delta_t = 239.160 [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)
The mask-weighted light curves based on cleaned DPHs
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 -0.008 sec. to 0.568 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00943 ( -0.224853 0.218693 )
Norm@50keV : 1.26532E-02 ( -0.0015916 0.00158927 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.10 using 59 PHA bins.
# Reduced chi-squared = 0.8264 for 57 degrees of freedom
# Null hypothesis probability = 8.220801e-01
Photon flux (15-150 keV) in 0.576 sec: 1.45733 ( -0.184996 0.185613 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.85111e-08 ( -1.11058e-08 1.12894e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.568 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.391049 ( -1.01425 0.713982 )
Epeak [keV] : 142.865 ( )
Norm@50keV : 2.44153E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.47 using 59 PHA bins.
# Reduced chi-squared = 0.8120 for 56 degrees of freedom
# Null hypothesis probability = 8.415114e-01
Photon flux (15-150 keV) in 0.576 sec: 1.41598 ( -0.19052 0.19352 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.52187e-08 ( -1.23016e-08 1.22498e-08 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 0.568 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.391047 ( -0.575859 1.00363 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 142.849 ( -58.56 202.733 )
Norm@50keV : 2.44152E-02 ( -0.0127103 0.0437672 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.47 using 59 PHA bins.
# Reduced chi-squared = 0.8268 for 55 degrees of freedom
# Null hypothesis probability = 8.165054e-01
Photon flux (15-150 keV) in 0.576 sec: 1.43354 ( ) 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] : 20.9234 (-3.43921 4.34867)
R^2/D10^2 : 6.05653E-02 (-0.0267199 0.0461882)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.47 using 59 PHA bins.
# Reduced chi-squared = 0.9206 for 57 degrees of freedom
# Null hypothesis probability = 6.453399e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.890e-09 7.468e-10
25- 50 1.482e-08 2.863e-09
50-150 4.834e-08 1.175e-08
15-150 6.606e-08 1.208e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.81069 (-0.761057 0.761043)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.64 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 57 degrees of freedom
# Null hypothesis probability = 3.138190e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.335e-09 4.674e-09
25- 50 1.603e-08 8.893e-09
50-150 3.517e-08 1.962e-08
15-150 5.954e-08 3.318e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.102194 (0.822496 -0.102194)
R1^2/D10^2 : 1.25365E+18 (-1.25366e+18 -1.25366e+18)
kT2 [keV] : 20.9342 (-3.44228 4.3456)
R2^2/D10^2 : 6.04704E-02 (-0.0266958 0.0462154)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.47 using 59 PHA bins.
# Reduced chi-squared = 0.9541 for 55 degrees of freedom
# Null hypothesis probability = 5.717304e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from -0.188 sec. to 0.812 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.863632 ( -0.256454 0.244189 )
Norm@50keV : 7.74876E-03 ( -0.0011408 0.00113154 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.38 using 59 PHA bins.
# Reduced chi-squared = 0.7435 for 57 degrees of freedom
# Null hypothesis probability = 9.255783e-01
Photon flux (15-150 keV) in 1 sec: 0.889374 ( -0.129586 0.130094 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.8216e-08 ( -1.35646e-08 1.37085e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.188 sec. to 0.812 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.77873E-02 ( -1.28316 0.972507 )
Epeak [keV] : 127.854 ( -43.0824 5353.09 )
Norm@50keV : 2.00406E-02 ( -0.0121298 0.0445453 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.57 using 59 PHA bins.
# Reduced chi-squared = 0.7065 for 56 degrees of freedom
# Null hypothesis probability = 9.528179e-01
Photon flux (15-150 keV) in 1 sec: 0.851636 ( -0.134801 0.135475 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.38431e-08 ( -1.47512e-08 1.4711e-08 ) ergs/cm2
Band function
Time interval is from -0.188 sec. to 0.812 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 9.51423E-02 ( -0.780444 1.39256 )
beta : -10.0000 ( 10 8.88178e-15 )
Epeak [keV] : 128.022 ( -41.8345 284.339 )
Norm@50keV : 1.99930E-02 ( -0.0120479 0.044522 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.57 using 59 PHA bins.
# Reduced chi-squared = 0.7194 for 55 degrees of freedom
# Null hypothesis probability = 9.420289e-01
Photon flux (15-150 keV) in 1 sec: 0.868777 ( ) 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] : 23.7830 (-4.17814 5.51039)
R^2/D10^2 : 2.60165E-02 (-0.0120559 0.0211234)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.19 using 59 PHA bins.
# Reduced chi-squared = 0.7402 for 57 degrees of freedom
# Null hypothesis probability = 9.286308e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.623e-09 8.215e-10
25- 50 1.450e-08 3.676e-09
50-150 6.114e-08 1.667e-08
15-150 7.826e-08 1.869e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.53029 (-0.540367 0.540347)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.62 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 57 degrees of freedom
# Null hypothesis probability = 3.144132e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.792e-09 5.085e-09
25- 50 1.691e-08 9.490e-09
50-150 3.709e-08 2.092e-08
15-150 6.280e-08 3.563e-08
Double BB
R1^2/D10^2 : 9.87372E+08 ( )
kT2 [keV] : 24.2154 (-4.35174 5.80095)
R2^2/D10^2 : 2.44968E-02 (-0.00707847 0.0105493)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.19 using 59 PHA bins.
#Fit statistic : Chi-Squared = 40.42 using 59 PHA bins.
#Fit statistic : Chi-Squared = 40.16 using 59 PHA bins.
# Reduced chi-squared = 0.7671 for 55 degrees of freedom
# Reduced chi-squared = 0.7349 for 55 degrees of freedom
# Reduced chi-squared = 0.7302 for 55 degrees of freedom
# Null hypothesis probability = 8.973831e-01
# Null hypothesis probability = 9.294318e-01
# Null hypothesis probability = 9.334416e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
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: 1.00943 ( -0.224853 0.218693 )
Norm@50keV : 1.26532E-02 ( -0.0015916 0.00158927 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.10 using 59 PHA bins.
# Reduced chi-squared = 0.8264 for 57 degrees of freedom
# Null hypothesis probability = 8.220801e-01
Photon flux (15-150 keV) in 0.576 sec: 1.45733 ( -0.184996 0.185613 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.85111e-08 ( -1.11058e-08 1.12894e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.391049 ( -1.01425 0.713982 )
Epeak [keV] : 142.865 ( )
Norm@50keV : 2.44153E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.47 using 59 PHA bins.
# Reduced chi-squared = 0.8120 for 56 degrees of freedom
# Null hypothesis probability = 8.415114e-01
Photon flux (15-150 keV) in 0.576 sec: 1.41598 ( -0.19051 0.19352 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.52187e-08 ( -1.23016e-08 1.22498e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.391086 ( -0.575399 1.00655 )
beta : -10.0000 ( 10 2.91323e-13 )
Epeak [keV] : 142.855 ( -58.5663 202.765 )
Norm@50keV : 2.44142E-02 ( -0.0127092 0.0437682 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.47 using 59 PHA bins.
# Reduced chi-squared = 0.8268 for 55 degrees of freedom
# Null hypothesis probability = 8.165054e-01
Photon flux (15-150 keV) in 0.576 sec: 1.43354 ( ) 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) = 1.46e-08
S(50-100 keV) = 2.91e-08
T90 vs. Hardness ratio plot
T90 = 0.51199996471405 sec.
Hardness ratio (energy fluence ratio) = 1.99315
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 2.3425
Count Ratio (50-100 keV) / (15-25 keV) = 2.26487
Mask shadow pattern
IMX = 1.962374582997249E-01, IMY = 1.263874497532329E-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:
-597.067410 -578.595400
-239.168000 -0.008000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5277 -40.5514 1.0 25.6 -42.5 2.5028 11.3 0.2 Vela X-1
170.4156 -60.6790 1.4 4.0 115.7 1.4754 8.3 4.5 Cen X-3
186.7592 -62.6451 6.8 11.9 124.5 0.3270 1.7 8.0 GX 301-2
167.4864 -34.4646 2.5 25.6 20.0 0.9599 4.6 ------ UNKNOWN
147.5821 -5.8994 2.3 55.2 -7.6 3.2874 5.0 ------ UNKNOWN
140.2208 -4.7615 3.0 57.7 -16.0 3.5497 3.9 ------ UNKNOWN
4.9577 -61.0240 3.7 57.9 -156.7 4.4599 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.008000 0.568000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5011 -40.5285 1689.7 25.6 -42.5 -0.0001 -0.0 2.0 Vela X-1
170.1877 -60.5702 6.3 3.8 114.4 0.0174 1.8 4.9 Cen X-3
186.6296 -62.9368 189.5 11.8 126.0 0.0006 0.1 10.0 GX 301-2
148.6869 -49.4244 0.8 13.1 -32.8 0.1131 13.6 ------ UNKNOWN
134.4507 -5.0158 2.4 58.9 -22.6 0.2787 4.8 ------ UNKNOWN
82.0477 -61.8363 2.2 36.7 -118.2 0.0897 5.2 ------ UNKNOWN
124.1715 -15.2011 2.2 52.7 -38.3 0.2162 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
56.732610 594.832600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5129 -40.5572 0.5 12.8 -64.5 8.1953 23.6 0.7 Vela X-1
170.2281 -60.6152 1.8 16.5 127.7 2.2579 6.3 2.6 Cen X-3
186.5374 -62.6991 4.6 24.4 124.0 1.0219 2.5 5.4 GX 301-2
39.2723 -61.6824 2.7 55.5 -160.3 5.7018 4.3 ------ UNKNOWN
132.4172 3.0568 4.1 54.3 -33.3 6.0986 2.8 ------ UNKNOWN
86.2622 -40.5752 3.6 43.7 -116.2 5.5674 3.2 ------ UNKNOWN
Plot creation:
Sat May 30 19:31:26 EDT 2015