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
315.9218 64.9389 0.0199 21.0889 147.1399 0.7180291 9.669 TRIG_00358520
Foreground time interval of the image:
-1.340 29.725 (delta_t = 31.065 [sec])
Background time interval of the image:
-82.275 -1.340 (delta_t = 80.935 [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 2.048000
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 2.048000
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 2.048000
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 -1.340 sec. to 318.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23652 ( -0.241628 0.239354 )
Norm@50keV : 4.38081E-04 ( -5.88908e-05 5.87693e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.59 using 59 PHA bins.
# Reduced chi-squared = 0.9928 for 57 degrees of freedom
# Null hypothesis probability = 4.903321e-01
Photon flux (15-150 keV) in 320.2 sec: 5.17018E-02 ( -0.00697785 0.00698872 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40865e-06 ( -2.16698e-07 2.2088e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.340 sec. to 318.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.982901 ( -1.0787 0.479815 )
Epeak [keV] : 209.069 ( -209.058 -209.058 )
Norm@50keV : 5.82376E-04 ( -0.000198532 0.00126255 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.37 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 56 degrees of freedom
# Null hypothesis probability = 4.611326e-01
Photon flux (15-150 keV) in 320.2 sec: 5.10656E-02 ( -0.0073819 0.007308 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38081e-06 ( -2.41527e-07 2.39257e-07 ) ergs/cm2
Band function
Time interval is from -1.340 sec. to 318.884 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97726 ( -4.97726 -4.97726 )
beta : -1.25611 ( -0.259852 0.249774 )
Epeak [keV] : 20.8936 ( -20.8936 8.72742 )
Norm@50keV : 104.212 ( -13.8869 153814 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.45 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.205932e-01
Photon flux (15-150 keV) in 320.2 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] : 18.2620 (-2.96784 3.73742)
R^2/D10^2 : 3.14941E-03 (-0.00143356 0.00251358)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.87 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 57 degrees of freedom
# Null hypothesis probability = 1.968939e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.702e-08 1.878e-08
25- 50 3.133e-07 6.974e-08
50-150 7.612e-07 2.048e-07
15-150 1.141e-06 2.438e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 0.210984 (-0.0285478 0.0285464)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.94 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.363048e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.682e-07 9.736e-08
25- 50 3.236e-07 1.819e-07
50-150 7.097e-07 3.894e-07
15-150 1.202e-06 6.724e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.67611 (-2.06398 3.75363)
R1^2/D10^2 : 0.173766 (-0.153625 2.83004)
kT2 [keV] : 23.0762 (-4.85568 10.0546)
R2^2/D10^2 : 1.33974E-03 (-0.000947383 0.00164537)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.32 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 55 degrees of freedom
# Null hypothesis probability = 4.625030e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.440e-07 7.547e-08
25- 50 2.813e-07 1.142e-07
50-150 8.952e-07 4.956e-07
15-150 1.321e-06 5.582e-07
Peak spectrum fit
Power-law model
Time interval is from 0.116 sec. to 1.116 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24430 ( -0.548423 0.536156 )
Norm@50keV : 4.40228E-03 ( -0.00122621 0.00120627 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.35 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 57 degrees of freedom
# Null hypothesis probability = 2.093578e-01
Photon flux (15-150 keV) in 1 sec: 0.520191 ( -0.141878 0.142134 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.4125e-08 ( -1.41712e-08 1.46876e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.116 sec. to 1.116 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25607 ( -0.863694 0.525313 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 4.38930E-03 ( -0.00122902 0.0126831 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.36 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 56 degrees of freedom
# Null hypothesis probability = 1.836114e-01
Photon flux (15-150 keV) in 1 sec: 0.521047 ( -0.142816 0.141244 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.42686e-08 ( -1.43261e-08 1.4261e-08 ) ergs/cm2
Band function
Time interval is from 0.116 sec. to 1.116 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.904531 ( 0.90453 0.90453 )
beta : -1.25229 ( 1.25229 0.555769 )
Epeak [keV] : 77.4846 ( -77.4848 -77.4848 )
Norm@50keV : 7.98911E-03 ( -0.00477659 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.35 using 59 PHA bins.
# Reduced chi-squared = 1.188 for 55 degrees of freedom
# Null hypothesis probability = 1.602230e-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] : 20.6782 (-9.35849 16.313)
R^2/D10^2 : 2.03458E-02 (-0.0198661 0.121126)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.67 using 59 PHA bins.
# Reduced chi-squared = 1.257 for 57 degrees of freedom
# Null hypothesis probability = 9.133811e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.654e-09 1.049e-09
25- 50 8.421e-09 5.120e-09
50-150 2.680e-08 1.665e-08
15-150 3.688e-08 2.194e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-113.104 -199.363)
Norm : 2.10189 (-0.579383 0.580384)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.68 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 57 degrees of freedom
# Null hypothesis probability = 1.783681e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.234e-09 3.173e-09
25- 50 1.007e-08 6.360e-09
50-150 2.208e-08 1.340e-08
15-150 3.738e-08 2.313e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.09477 (-2.49034 3.93798)
R1^2/D10^2 : 0.967076 (-0.823855 7.2204)
kT2 [keV] : 40.4602 (-19.2296 -40.4591)
R2^2/D10^2 : 2.43896E-03 (-0.00235101 0.0136674)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.54 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 55 degrees of freedom
# Null hypothesis probability = 2.009866e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.391e-09 3.331e-09
25- 50 8.531e-09 4.780e-09
50-150 3.439e-08 1.952e-08
15-150 4.831e-08 2.674e-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: 1.19331 ( -0.253324 0.249794 )
Norm@50keV : 1.59347E-03 ( -0.000211348 0.000210928 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.85 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 57 degrees of freedom
# Null hypothesis probability = 4.077604e-01
Photon flux (15-150 keV) in 31.06 sec: 0.186866 ( -0.025105 0.0251762 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.03079e-07 ( -7.69931e-08 7.81597e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19369 ( -0.270306 0.246858 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.60069E-03 ( -0.00160077 0.00166166 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.85 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 56 degrees of freedom
# Null hypothesis probability = 3.714252e-01
Photon flux (15-150 keV) in 31.06 sec: 0.187002 ( -0.025354 0.024965 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.02498e-07 ( -7.66654e-08 7.77805e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.907221 ( 0.905322 0.905322 )
beta : -1.19499 ( 1.19426 0.254369 )
Epeak [keV] : 72.9449 ( -72.7235 -72.7235 )
Norm@50keV : 2.79996E-03 ( -0.00142121 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.84 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 55 degrees of freedom
# Null hypothesis probability = 3.367667e-01
Photon flux (15-150 keV) in 31.06 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) = 3.02e-07
S(50-100 keV) = 5.13e-07
T90 vs. Hardness ratio plot
T90 = 301.879999995232 sec.
Hardness ratio (energy fluence ratio) = 1.69868
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.17106
Count Ratio (50-100 keV) / (15-25 keV) = 1.30336
Mask shadow pattern
IMX = -3.239411333196693E-01, IMY = -2.092473103160312E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-82.275410 -1.340000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.0723 40.9567 9.1 40.2 115.8 0.4921 1.3 1.7 Cyg X-3
326.3653 38.3582 40.5 34.8 93.9 -0.0687 -0.3 9.4 Cyg X-2
34.7687 12.6022 2.4 55.2 -2.3 1.7690 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.340000 29.724610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.0877 40.9900 9.9 40.2 115.8 -0.3369 -1.2 2.5 Cyg X-3
326.1025 38.3327 46.1 35.0 94.2 -0.0413 -0.2 3.3 Cyg X-2
283.0275 46.7652 2.3 46.3 142.0 1.3647 5.1 ------ UNKNOWN
315.9222 64.9389 1.2 21.1 147.1 0.7182 9.7 ------ UNKNOWN
1.1219 55.7185 2.3 8.8 51.5 0.3110 5.0 ------ UNKNOWN
244.6102 62.9489 2.3 45.8 179.5 0.6681 5.1 ------ UNKNOWN
9.9266 72.7717 2.2 8.7 -140.7 0.3537 5.2 ------ UNKNOWN
37.4428 24.8226 1.9 44.2 -10.1 0.6936 5.9 ------ UNKNOWN
40.8222 32.7775 2.1 37.9 -18.7 0.4882 5.5 ------ UNKNOWN
46.8794 34.8059 2.0 38.2 -27.5 0.5443 5.9 ------ UNKNOWN
60.3645 43.9618 2.3 36.0 -50.3 0.5586 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
72.124600 303.924600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3845 35.3631 22.8 46.5 163.6 0.2722 0.5 3.8 Her X-1
299.5913 35.1912 0.4 31.3 108.4 9.8884 25.7 0.6 Cyg X-1
308.0525 40.9755 5.2 24.4 96.7 0.6029 2.2 3.0 Cyg X-3
326.2633 38.4555 14.3 27.1 64.2 0.2219 0.8 9.1 Cyg X-2
316.8272 45.7732 3.0 19.2 80.2 0.8516 3.8 ------ UNKNOWN
260.5469 40.3532 3.0 39.7 161.4 1.3333 3.9 ------ UNKNOWN
3.4724 36.2927 2.2 39.9 14.2 1.6362 5.2 ------ UNKNOWN
284.0667 51.8160 2.3 20.9 148.5 1.1270 4.9 ------ UNKNOWN
288.5525 54.9880 4.0 16.7 148.7 0.6146 2.9 ------ UNKNOWN
315.8854 64.8742 1.7 0.1 128.4 1.3084 6.8 ------ UNKNOWN
245.9381 67.1926 2.5 27.0 -151.4 0.9430 4.6 ------ UNKNOWN
212.4442 49.7283 2.2 51.2 -151.8 3.0497 5.2 ------ UNKNOWN
Plot creation:
Sun May 31 03:25:00 EDT 2015