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
313.4600 69.0302 0.0141 23.8782 133.9387 0.1001109 13.735 TRIG_00355359
Foreground time interval of the image:
-0.028 0.144 (delta_t = 0.172 [sec])
Background time interval of the image:
-239.496 -0.028 (delta_t = 239.468 [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 -0.028 sec. to 0.144 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.683996 ( -0.244326 0.230633 )
Norm@50keV : 3.46116E-02 ( -0.00469759 0.00460739 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.05 using 59 PHA bins.
# Reduced chi-squared = 0.7027 for 57 degrees of freedom
# Null hypothesis probability = 9.568233e-01
Photon flux (15-150 keV) in 0.172 sec: 4.00612 ( -0.513612 0.514492 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.31958e-08 ( -1.01052e-08 1.0176e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.028 sec. to 0.144 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.680283 ( -0.769259 0.22854 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.48720E-02 ( -0.00442614 0.0354194 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.07 using 59 PHA bins.
# Reduced chi-squared = 0.7155 for 56 degrees of freedom
# Null hypothesis probability = 9.466608e-01
Photon flux (15-150 keV) in 0.172 sec: 4.01015 ( -0.51896 0.50955 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.31597e-08 ( -1.00491e-08 1.01623e-08 ) ergs/cm2
Band function
Time interval is from -0.028 sec. to 0.144 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -0.686151 ( -0.232269 0.24565 )
Epeak [keV] : 19.5789 ( -19.5804 -19.5804 )
Norm@50keV : 6881.84 ( -860.699 4.03372e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.03 using 59 PHA bins.
# Reduced chi-squared = 0.7278 for 55 degrees of freedom
# Null hypothesis probability = 9.353869e-01
Photon flux (15-150 keV) in 0.172 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] : 27.8070 (-5.19607 7.51061)
R^2/D10^2 : 7.58298E-02 (-0.0366616 0.0622533)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.61 using 59 PHA bins.
# Reduced chi-squared = 0.8880 for 57 degrees of freedom
# Null hypothesis probability = 7.118968e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.651e-09 4.328e-10
25- 50 9.858e-09 2.178e-09
50-150 5.525e-08 1.463e-08
15-150 6.675e-08 1.357e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 14.7829 (-2.08143 2.08141)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.03 using 59 PHA bins.
# Reduced chi-squared = 1.334 for 57 degrees of freedom
# Null hypothesis probability = 4.681352e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.332e-09 3.563e-09
25- 50 1.218e-08 6.887e-09
50-150 2.671e-08 1.500e-08
15-150 4.522e-08 2.584e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 14.7282 (-7.26146 6.39605)
R1^2/D10^2 : 0.331131 (-0.237658 2.54935)
kT2 [keV] : 199.743 ( )
R2^2/D10^2 : 9.25777E-04 (-0.000364048 -0.000925777)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.15 using 59 PHA bins.
#Fit statistic : Chi-Squared = 40.05 using 59 PHA bins.
# Reduced chi-squared = 0.7300 for 55 degrees of freedom
# Reduced chi-squared = 0.7282 for 55 degrees of freedom
# Null hypothesis probability = 9.336126e-01
# Null hypothesis probability = 9.350710e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.896e-09 1.683e-09
25- 50 1.179e-08 6.742e-09
50-150 5.825e-08 4.834e-08
15-150 7.293e-08 5.358e-08
Peak spectrum fit
Power-law model
Time interval is from -0.440 sec. to 0.560 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00430 ( -0.367966 0.341829 )
Norm@50keV : 6.31735E-03 ( -0.00130623 0.00130033 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.42 using 59 PHA bins.
# Reduced chi-squared = 0.6564 for 57 degrees of freedom
# Null hypothesis probability = 9.790946e-01
Photon flux (15-150 keV) in 1 sec: 0.727452 ( -0.152179 0.152869 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.82154e-08 ( -1.51301e-08 1.53566e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.440 sec. to 0.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.289371 ( -2.56933 1.24402 )
Epeak [keV] : 121.982 ( -122.491 -122.491 )
Norm@50keV : 1.43825E-02 ( -0.00907 0.261184 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.87 using 59 PHA bins.
# Reduced chi-squared = 0.6584 for 56 degrees of freedom
# Null hypothesis probability = 9.773997e-01
Photon flux (15-150 keV) in 1 sec: 0.708654 ( -0.162945 0.079978 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.39901e-08 ( -1.96736e-08 1.79656e-08 ) ergs/cm2
Band function
Time interval is from -0.440 sec. to 0.560 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.64277 ( -12.787 -4.64277 )
beta : -1.42365 ( -0.680235 0.53328 )
Epeak [keV] : 40.8009 ( -13.4789 13.5487 )
Norm@50keV : 18.8527 ( -3.76536 3123.34 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.67 using 59 PHA bins.
# Reduced chi-squared = 0.6303 for 55 degrees of freedom
# Null hypothesis probability = 9.854475e-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] : 17.9861 (-3.98944 6.22467)
R^2/D10^2 : 4.96651E-02 (-0.0308071 0.0645574)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.61 using 59 PHA bins.
# Reduced chi-squared = 0.6774 for 57 degrees of freedom
# Null hypothesis probability = 9.705056e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.218e-09 1.414e-09
25- 50 1.487e-08 6.398e-09
50-150 3.492e-08 1.422e-08
15-150 5.301e-08 1.940e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 2.94952 (-0.631307 0.631276)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.37 using 59 PHA bins.
# Reduced chi-squared = 0.7608 for 57 degrees of freedom
# Null hypothesis probability = 9.085430e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.344e-09 4.251e-09
25- 50 1.413e-08 8.275e-09
50-150 3.098e-08 1.815e-08
15-150 5.246e-08 3.077e-08
Double BB
R1^2/D10^2 : 0.115182 ( )
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 1.19679E-04 (-8.10431e-05 0.00101438)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.69 using 59 PHA bins.
#Fit statistic : Chi-Squared = 33.38 using 59 PHA bins.
#Fit statistic : Chi-Squared = 33.30 using 59 PHA bins.
# Reduced chi-squared = 0.6125 for 55 degrees of freedom
# Reduced chi-squared = 0.6069 for 55 degrees of freedom
# Reduced chi-squared = 0.6055 for 55 degrees of freedom
# Null hypothesis probability = 9.895679e-01
# Null hypothesis probability = 9.906515e-01
# Null hypothesis probability = 9.909166e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.291e-09 2.579e-09
25- 50 1.537e-08 9.625e-09
50-150 4.727e-08 2.551e-08
15-150 6.693e-08 3.310e-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: 0.683996 ( -0.244326 0.230633 )
Norm@50keV : 3.46116E-02 ( -0.00469759 0.00460739 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.05 using 59 PHA bins.
# Reduced chi-squared = 0.7027 for 57 degrees of freedom
# Null hypothesis probability = 9.568233e-01
Photon flux (15-150 keV) in 0.172 sec: 4.00612 ( -0.513612 0.514492 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.31958e-08 ( -1.01052e-08 1.0176e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.680283 ( -0.769259 0.22854 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.48720E-02 ( -0.00442614 0.0354194 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.07 using 59 PHA bins.
# Reduced chi-squared = 0.7155 for 56 degrees of freedom
# Null hypothesis probability = 9.466608e-01
Photon flux (15-150 keV) in 0.172 sec: 4.01015 ( -0.51896 0.50955 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.31597e-08 ( -1.00491e-08 1.01623e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -0.686151 ( -0.232269 0.24565 )
Epeak [keV] : 19.5789 ( -19.5804 -19.5804 )
Norm@50keV : 6881.84 ( -860.699 4.03372e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.03 using 59 PHA bins.
# Reduced chi-squared = 0.7278 for 55 degrees of freedom
# Null hypothesis probability = 9.353869e-01
Photon flux (15-150 keV) in 0.172 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) = 1.08e-08
S(50-100 keV) = 2.70e-08
T90 vs. Hardness ratio plot
T90 = 0.140000015497208 sec.
Hardness ratio (energy fluence ratio) = 2.5
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.63371
Count Ratio (50-100 keV) / (15-25 keV) = 2.37331
Mask shadow pattern
IMX = -3.071729157571842E-01, IMY = -3.187682394523158E-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:
-239.496000 -0.028000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
326.0496 38.3340 5.7 36.1 72.5 0.8815 2.0 5.8 Cyg X-2
338.5490 21.3079 2.9 46.3 45.9 2.6340 3.9 ------ UNKNOWN
342.4261 17.5348 2.6 48.7 39.6 3.3826 4.3 ------ UNKNOWN
339.5755 33.9563 2.8 34.3 52.3 1.2096 4.1 ------ UNKNOWN
347.4423 48.0221 2.5 19.2 56.6 0.8370 4.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.028000 0.144000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
326.2798 38.3536 4.2 35.9 72.3 -0.0413 -2.7 5.4 Cyg X-2
313.4600 69.0302 0.8 23.9 133.9 0.1001 13.7 ------ UNKNOWN
47.3680 76.5270 2.7 18.8 -152.5 0.0245 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
54.404590 835.504600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5940 35.2042 0.4 34.7 71.4 35.9061 32.3 0.2 Cyg X-1
308.0301 40.8190 14.2 28.3 60.0 0.5122 0.8 8.8 Cyg X-3
326.1386 38.3798 3.5 31.4 32.0 1.9299 3.2 3.8 Cyg X-2
316.4055 22.2943 2.8 46.8 47.5 9.0358 4.1 ------ UNKNOWN
314.0349 58.4201 5.2 10.6 49.7 0.8769 2.2 ------ UNKNOWN
202.0045 42.9582 2.5 57.3 177.2 13.2694 4.7 ------ UNKNOWN
200.2971 57.0151 2.5 45.1 -173.8 3.9249 4.5 ------ UNKNOWN
355.9488 46.6982 2.9 30.6 -14.2 1.7634 4.0 ------ UNKNOWN
178.4474 59.3913 4.3 47.6 -157.9 2.4400 2.7 ------ UNKNOWN
Plot creation:
Sun May 31 03:43:31 EDT 2015