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
85.2100 -19.2841 0.0230 29.6625 166.3031 0.2972575 8.382 TRIG_00164279
Foreground time interval of the image:
1.388 10.996 (delta_t = 9.608 [sec])
Background time interval of the image:
-141.371 1.388 (delta_t = 142.759 [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 5.504000
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 5.504000
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 5.504000
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 1.388 sec. to 10.996 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54418 ( -0.298578 0.308104 )
Norm@50keV : 1.93043E-03 ( -0.000373888 0.000368562 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.51 using 59 PHA bins.
# Reduced chi-squared = 1.395 for 57 degrees of freedom
# Null hypothesis probability = 2.609332e-02
Photon flux (15-150 keV) in 9.608 sec: 0.243971 ( -0.0446218 0.0446717 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74755e-07 ( -3.62261e-08 3.70878e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.388 sec. to 10.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.533521 ( -1.47654 1.10881 )
Epeak [keV] : 70.7541 ( -21.4078 -70.8532 )
Norm@50keV : 6.41701E-03 ( -0.00639309 0.028483 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.15 using 59 PHA bins.
# Reduced chi-squared = 1.378 for 56 degrees of freedom
# Null hypothesis probability = 3.201021e-02
Photon flux (15-150 keV) in 9.608 sec: 0.235591 ( -0.045491 0.045562 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63589e-07 ( -3.70091e-08 3.89374e-08 ) ergs/cm2
Band function
Time interval is from 1.388 sec. to 10.996 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.535772 ( -1.0833 1.52844 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 70.8322 ( -21.6859 405.856 )
Norm@50keV : 6.39872E-03 ( -0.00639863 0.0284294 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.15 using 59 PHA bins.
# Reduced chi-squared = 1.403 for 55 degrees of freedom
# Null hypothesis probability = 2.605637e-02
Photon flux (15-150 keV) in 9.608 sec: 0.238425 ( 6.76157 -0.047264 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74386e-07 ( -1.74319e-07 -5.13567e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.8541 (-3.05332 3.78117)
R^2/D10^2 : 2.93601E-02 (-0.0161043 0.0364259)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.63 using 59 PHA bins.
# Reduced chi-squared = 1.432 for 57 degrees of freedom
# Null hypothesis probability = 1.787821e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.305e-08 4.716e-09
25- 50 5.139e-08 1.555e-08
50-150 7.683e-08 2.999e-08
15-150 1.413e-07 4.100e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 186.196 (-100.917 -184.34)
Norm : 1.00535 (-0.184073 0.221152)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.23 using 59 PHA bins.
# Reduced chi-squared = 1.372 for 57 degrees of freedom
# Null hypothesis probability = 3.252377e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.426e-08 1.400e-08
25- 50 4.629e-08 2.583e-08
50-150 9.919e-08 5.616e-08
15-150 1.697e-07 9.449e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.75068 (-2.54141 4.24456)
R1^2/D10^2 : 0.428448 (-0.365166 3.99406)
kT2 [keV] : 20.3074 (-5.4469 11.4095)
R2^2/D10^2 : 8.12972E-03 (-0.00669756 0.0184231)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.74 using 59 PHA bins.
# Reduced chi-squared = 1.377 for 55 degrees of freedom
# Null hypothesis probability = 3.330815e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.315e-08 1.338e-08
25- 50 4.646e-08 2.424e-08
50-150 9.630e-08 5.938e-08
15-150 1.659e-07 8.931e-08
Peak spectrum fit
Power-law model
Time interval is from 1.440 sec. to 2.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50821 ( -0.432223 0.455726 )
Norm@50keV : 4.02066E-03 ( -0.00117095 0.00115388 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.71 using 59 PHA bins.
# Reduced chi-squared = 1.539 for 57 degrees of freedom
# Null hypothesis probability = 5.562921e-03
Photon flux (15-150 keV) in 1 sec: 0.503044 ( -0.140241 0.140575 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.80947e-08 ( -1.1751e-08 1.21421e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.440 sec. to 2.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.33850 ( 1.39187 2.55782 )
Epeak [keV] : 59.9449 ( -13.4611 63.4237 )
Norm@50keV : 9.50769E-02 ( -0.106074 985.823 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.70 using 59 PHA bins.
# Reduced chi-squared = 1.495 for 56 degrees of freedom
# Null hypothesis probability = 9.639391e-03
Photon flux (15-150 keV) in 1 sec: 0.449387 ( -0.218136 0.152634 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.35725e-08 ( -1.27431e-08 1.23265e-08 ) ergs/cm2
Band function
Time interval is from 1.440 sec. to 2.440 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.19010 ( -1.86662 -0.606145 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 60.5798 ( -14.1452 63.4375 )
Norm@50keV : 8.18889E-02 ( -0.0818942 4.47226 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.71 using 59 PHA bins.
# Reduced chi-squared = 1.522 for 55 degrees of freedom
# Null hypothesis probability = 7.565896e-03
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] : 15.3559 (-3.3554 4.52538)
R^2/D10^2 : 5.83972E-02 (-0.035401 0.0799596)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.51 using 59 PHA bins.
# Reduced chi-squared = 1.465 for 57 degrees of freedom
# Null hypothesis probability = 1.262797e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.871e-09 1.544e-09
25- 50 1.165e-08 7.005e-09
50-150 1.889e-08 1.203e-08
15-150 3.342e-08 1.752e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 182.460 (-116.671 -183.476)
Norm : 2.09976 (-0.578238 0.711683)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.71 using 59 PHA bins.
# Reduced chi-squared = 1.521 for 57 degrees of freedom
# Null hypothesis probability = 6.796114e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.287e-09 3.142e-09
25- 50 1.006e-08 5.930e-09
50-150 2.141e-08 1.287e-08
15-150 3.676e-08 2.235e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.49264 (-3.46434 196.422)
R1^2/D10^2 : 3.85964 (-4.12639 -4.12639)
kT2 [keV] : 16.4586 (-3.88905 4.66891)
R2^2/D10^2 : 4.34835E-02 (-0.0448781 0.0762369)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.74 using 59 PHA bins.
# Reduced chi-squared = 1.504 for 55 degrees of freedom
# Null hypothesis probability = 9.156042e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.168e-09 1.983e-09
25- 50 1.085e-08 6.475e-09
50-150 1.995e-08 1.272e-08
15-150 3.496e-08 2.065e-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: 1.54418 ( -0.298578 0.308104 )
Norm@50keV : 1.93043E-03 ( -0.000373888 0.000368562 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.51 using 59 PHA bins.
# Reduced chi-squared = 1.395 for 57 degrees of freedom
# Null hypothesis probability = 2.609332e-02
Photon flux (15-150 keV) in 9.608 sec: 0.243971 ( -0.0446218 0.0446717 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74755e-07 ( -3.62261e-08 3.70878e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.533521 ( -1.47654 1.10881 )
Epeak [keV] : 70.7541 ( -21.4078 -70.8532 )
Norm@50keV : 6.41701E-03 ( -0.00639309 0.028483 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.15 using 59 PHA bins.
# Reduced chi-squared = 1.378 for 56 degrees of freedom
# Null hypothesis probability = 3.201021e-02
Photon flux (15-150 keV) in 9.608 sec: 0.235591 ( -0.045491 0.045562 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63589e-07 ( -3.70091e-08 3.89374e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.537586 ( -1.04003 1.56211 )
beta : -10.0000 ( 10 2.4869e-14 )
Epeak [keV] : 70.8880 ( -21.7413 409.395 )
Norm@50keV : 6.38401E-03 ( -0.00638392 0.0284441 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.15 using 59 PHA bins.
# Reduced chi-squared = 1.403 for 55 degrees of freedom
# Null hypothesis probability = 2.605636e-02
Photon flux (15-150 keV) in 9.608 sec: 0.238425 ( 6.76157 -0.047264 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74386e-07 ( -1.74319e-07 -5.13567e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 4.41e-08
S(50-100 keV) = 6.06e-08
T90 vs. Hardness ratio plot
T90 = 9.02000001072884 sec.
Hardness ratio (energy fluence ratio) = 1.37415
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.57539
Count Ratio (50-100 keV) / (15-25 keV) = 1.35406
Mask shadow pattern
IMX = -5.533267425423501E-01, IMY = -1.348543697746188E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 5.504000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 5.504000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 5.504000
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:
-141.371400 1.388000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
47.9142 -16.0995 3.1 10.4 48.5 0.4014 3.7 ------ UNKNOWN
95.6872 -36.1230 2.7 37.5 -161.5 0.6706 4.3 ------ UNKNOWN
70.2105 -66.0657 2.1 42.4 -108.9 2.7037 5.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
1.388000 10.996000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
85.2100 -19.2841 1.4 29.7 166.3 0.2973 8.4 ------ UNKNOWN
7.0571 -34.8003 3.1 41.2 -34.1 0.1699 3.8 ------ UNKNOWN
91.5165 -52.8693 2.4 39.7 -134.4 0.2396 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
117.828600 302.807600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6330 22.0084 0.7 41.3 129.2 8.0452 16.2 0.4 Crab
98.7521 25.3763 3.0 46.5 148.4 1.9132 3.9 ------ UNKNOWN
131.7441 -24.9435 2.5 43.3 -122.3 2.2039 4.6 ------ UNKNOWN
132.9312 -25.9287 2.5 44.3 -120.8 2.7357 4.6 ------ UNKNOWN
Plot creation:
Sun May 31 15:05:36 EDT 2015