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
189.5764 23.1829 0.0144 39.1984 -41.9162 4.8532735 13.428 TRIG_00436737
Foreground time interval of the image:
-43.752 164.872 (delta_t = 208.624 [sec])
Background time interval of the image:
-239.000 -43.752 (delta_t = 195.248 [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 64.000000
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 64.000000
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 64.000000
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 -43.752 sec. to 164.872 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.07327 ( -0.169607 0.177887 )
Norm@50keV : 1.32160E-03 ( -0.000148839 0.000145772 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.95 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 57 degrees of freedom
# Null hypothesis probability = 2.456834e-01
Photon flux (15-150 keV) in 208.6 sec: 0.205220 ( -0.0180093 0.0180267 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55518e-06 ( -2.60233e-07 2.64887e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -43.752 sec. to 164.872 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60782 ( -0.871337 0.527704 )
Epeak [keV] : 35.1529 ( -26.7851 -35.1532 )
Norm@50keV : 2.44341E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.76 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 56 degrees of freedom
# Null hypothesis probability = 2.492082e-01
Photon flux (15-150 keV) in 208.6 sec: 0.200568 ( -0.019422 0.019353 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43109e-06 ( -3.13609e-07 3.24978e-07 ) ergs/cm2
Band function
Time interval is from -43.752 sec. to 164.872 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.60822 ( -5.49032 0.248125 )
beta : -10.00000 ( 10 4.44089e-14 )
Epeak [keV] : 35.1424 ( -10.8975 -35.1424 )
Norm@50keV : 2.44159E-03 ( -0.000211307 0.00532749 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.76 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 55 degrees of freedom
# Null hypothesis probability = 2.205227e-01
Photon flux (15-150 keV) in 208.6 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] : 9.69046 (-0.951385 1.06356)
R^2/D10^2 : 0.104124 (-0.0348245 0.0521431)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.35 using 59 PHA bins.
# Reduced chi-squared = 1.480 for 57 degrees of freedom
# Null hypothesis probability = 1.076580e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.106e-07 5.903e-08
25- 50 9.759e-07 1.081e-07
50-150 4.647e-07 1.147e-07
15-150 1.851e-06 1.837e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 59.6918 (-14.0745 20.952)
Norm : 1.06528 (-0.157284 0.181466)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.10 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 57 degrees of freedom
# Null hypothesis probability = 2.696541e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.580e-07 6.529e-08
25- 50 8.480e-07 8.417e-08
50-150 9.607e-07 2.467e-07
15-150 2.367e-06 2.940e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.10185 (-3.44541 2.33156)
R1^2/D10^2 : 0.441182 (-0.27093 14.812)
kT2 [keV] : 18.6900 (-7.74108 34.5457)
R2^2/D10^2 : 5.26334E-03 (-0.00468813 0.0473969)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.98 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 55 degrees of freedom
# Null hypothesis probability = 1.475961e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.421e-07 1.979e-07
25- 50 8.427e-07 3.220e-07
50-150 9.696e-07 5.154e-07
15-150 2.354e-06 9.282e-07
Peak spectrum fit
Power-law model
Time interval is from -15.364 sec. to -14.364 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53855 ( -0.688758 0.773291 )
Norm@50keV : 4.75629E-03 ( -0.00189251 0.00181738 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.82 using 59 PHA bins.
# Reduced chi-squared = 0.8917 for 57 degrees of freedom
# Null hypothesis probability = 7.045838e-01
Photon flux (15-150 keV) in 1 sec: 0.600143 ( -0.231844 0.234234 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.48495e-08 ( -1.84556e-08 1.89228e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.364 sec. to -14.364 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.640994 ( -0.612537 2.20172 )
Epeak [keV] : 89.5833 ( -88.7148 -88.7148 )
Norm@50keV : 1.15956E-02 ( -0.0121657 197.837 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.58 using 59 PHA bins.
# Reduced chi-squared = 0.9033 for 56 degrees of freedom
# Null hypothesis probability = 6.793429e-01
Photon flux (15-150 keV) in 1 sec: 0.565013 ( -0.329811 0.257816 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.38305e-08 ( -1.98539e-08 1.89181e-08 ) ergs/cm2
Band function
Time interval is from -15.364 sec. to -14.364 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.782915 ( -2.99375 0.907525 )
beta : -10.0000 ( 10 1.95399e-14 )
Epeak [keV] : 94.0765 ( -63.5065 -94.3452 )
Norm@50keV : 1.03029E-02 ( -0.0101976 2.16574 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.59 using 59 PHA bins.
# Reduced chi-squared = 0.9199 for 55 degrees of freedom
# Null hypothesis probability = 6.435691e-01
Photon flux (15-150 keV) in 1 sec: 0.577393 ( ) 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] : 18.7695 (-5.8923 9.55102)
R^2/D10^2 : 3.25096E-02 (-0.0325088 0.0846256)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.77 using 59 PHA bins.
# Reduced chi-squared = 0.8906 for 57 degrees of freedom
# Null hypothesis probability = 7.066128e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.261e-09 1.492e-09
25- 50 1.078e-08 6.590e-09
50-150 2.784e-08 1.828e-08
15-150 4.089e-08 2.603e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 2.45341 (-0.916767 1.25763)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.73 using 59 PHA bins.
# Reduced chi-squared = 0.8900 for 57 degrees of freedom
# Null hypothesis probability = 7.078756e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.109e-09 3.951e-09
25- 50 1.175e-08 7.395e-09
50-150 2.577e-08 1.639e-08
15-150 4.363e-08 2.697e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.47379 (-2.0885 3.47151)
R1^2/D10^2 : 111.662 (-110.698 -111.254)
kT2 [keV] : 20.7773 (-6.55112 12.5643)
R2^2/D10^2 : 2.15496E-02 (-0.017193 0.0563231)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.08 using 59 PHA bins.
# Reduced chi-squared = 0.8559 for 55 degrees of freedom
# Null hypothesis probability = 7.675655e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.437e-09 3.979e-09
25- 50 9.414e-09 5.605e-09
50-150 2.898e-08 1.841e-08
15-150 4.583e-08 2.493e-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: 2.07327 ( -0.169607 0.177887 )
Norm@50keV : 1.32160E-03 ( -0.000148839 0.000145772 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.95 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 57 degrees of freedom
# Null hypothesis probability = 2.456834e-01
Photon flux (15-150 keV) in 208.6 sec: 0.205220 ( -0.0180093 0.0180267 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55518e-06 ( -2.60233e-07 2.64887e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60782 ( -0.871337 0.527704 )
Epeak [keV] : 35.1529 ( -27.402 -35.1532 )
Norm@50keV : 2.44341E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.76 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 56 degrees of freedom
# Null hypothesis probability = 2.492082e-01
Photon flux (15-150 keV) in 208.6 sec: 0.200568 ( -0.019422 0.019353 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43109e-06 ( -3.13609e-07 3.24978e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.60822 ( -4.0233 0.223879 )
beta : -10.00000 ( 10 1.95399e-14 )
Epeak [keV] : 35.1424 ( -10.8975 -35.1424 )
Norm@50keV : 2.44159E-03 ( -0.000211307 0.00532749 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.76 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 55 degrees of freedom
# Null hypothesis probability = 2.205227e-01
Photon flux (15-150 keV) in 208.6 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) = 7.85e-07
S(50-100 keV) = 7.46e-07
T90 vs. Hardness ratio plot
T90 = 172.336000025272 sec.
Hardness ratio (energy fluence ratio) = 0.950318
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.19692
Count Ratio (50-100 keV) / (15-25 keV) = 0.485481
Mask shadow pattern
IMX = 6.068572353274657E-01, IMY = 5.448124093499392E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
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:
-239.000000 -43.752000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9718 -15.6404 0.5 47.4 -147.9 10.1508 23.9 0.4 Sco X-1
254.2713 35.3170 8.4 18.5 116.6 -0.2705 -1.4 9.2 Her X-1
268.2948 -1.5291 4.9 46.3 174.8 0.9400 2.4 6.3 SW J1753.5-0127
212.0767 61.0575 2.4 33.7 29.7 1.1771 4.8 ------ UNKNOWN
216.0104 9.6604 3.2 26.0 -91.1 0.8463 3.6 ------ UNKNOWN
212.7780 -6.1133 3.3 41.3 -100.7 3.1369 3.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-43.752000 164.872000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.8938 -15.6999 6.9 47.4 -147.8 -0.8939 -1.7 6.1 Sco X-1
254.4173 35.4557 7.2 18.7 116.2 -0.4042 -1.6 7.1 Her X-1
268.5208 -1.4857 8.1 46.4 174.6 0.6650 1.4 9.4 SW J1753.5-0127
262.6656 -21.4513 2.5 59.1 -164.6 6.2886 4.6 ------ UNKNOWN
224.4250 6.0101 3.0 25.6 -112.1 1.0757 3.9 ------ UNKNOWN
189.5764 23.1829 0.9 39.2 -41.9 4.8528 13.4 ------ UNKNOWN
204.3943 0.0531 1.8 40.7 -84.9 5.4315 6.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
372.500610 483.020000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.7110 -40.5819 5.0 58.3 -154.6 -10.3533 -2.3 8.5 Vela X-1
170.5675 -60.6752 7.3 39.3 -124.3 -1.9890 -1.6 8.0 Cen X-3
186.3094 -62.8853 6.6 36.6 -112.5 2.3100 1.7 11.8 GX 301-2
264.6490 -44.3265 5.2 44.9 -39.0 -2.8806 -2.2 8.4 4U 1735-44
276.0120 -30.3445 5.8 56.6 -23.7 5.7877 2.0 4.7 H1820-303
303.7116 -26.9518 2.4 55.8 5.9 20.4629 4.9 ------ UNKNOWN
303.4571 -43.9277 2.3 39.1 1.9 5.0689 5.0 ------ UNKNOWN
159.6908 -50.7877 3.1 49.2 -133.1 11.6307 3.8 ------ UNKNOWN
Plot creation:
Sat May 30 23:39:01 EDT 2015