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
195.7447 41.2162 0.0157 35.4073 148.6841 0.5270594 12.174 TRIG_00209755
Foreground time interval of the image:
-4.364 4.924 (delta_t = 9.288 [sec])
Background time interval of the image:
-239.920 -4.364 (delta_t = 235.556 [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 4.096000
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 4.096000
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 4.096000
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 -4.364 sec. to 4.924 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.36426 ( -0.277675 0.309344 )
Norm@50keV : 2.56877E-03 ( -0.000565093 0.000552893 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.71 using 59 PHA bins.
# Reduced chi-squared = 0.6264 for 57 degrees of freedom
# Null hypothesis probability = 9.878372e-01
Photon flux (15-150 keV) in 9.288 sec: 0.465534 ( -0.0652982 0.0652983 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30916e-07 ( -3.97175e-08 4.12047e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.364 sec. to 4.924 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57915 ( -2.14981 0.432184 )
Epeak [keV] : 18.9954 ( )
Norm@50keV : 8.15537E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.83 using 59 PHA bins.
# Reduced chi-squared = 0.6220 for 56 degrees of freedom
# Null hypothesis probability = 9.881826e-01
Photon flux (15-150 keV) in 9.288 sec: 0.455444 ( -0.067258 0.067571 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11776e-07 ( -4.42908e-08 5.30428e-08 ) ergs/cm2
Band function
Time interval is from -4.364 sec. to 4.924 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.00940 ( -3.00908 -3.00908 )
beta : -2.65008 ( 2.65002 0.430555 )
Epeak [keV] : 22.7032 ( -22.7011 10.0151 )
Norm@50keV : 31.0451 ( -30.9925 442.169 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.84 using 59 PHA bins.
# Reduced chi-squared = 0.6153 for 55 degrees of freedom
# Null hypothesis probability = 9.890041e-01
Photon flux (15-150 keV) in 9.288 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] : 7.40151 (-1.05945 1.2277)
R^2/D10^2 : 0.704981 (-0.330923 0.628987)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.92 using 59 PHA bins.
# Reduced chi-squared = 0.7003 for 57 degrees of freedom
# Null hypothesis probability = 9.582737e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.084e-08 1.533e-08
25- 50 9.261e-08 2.174e-08
50-150 1.870e-08 8.535e-09
15-150 1.721e-07 3.232e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 35.9471 (-10.6679 17.3752)
Norm : 3.25320 (-0.831078 1.19008)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.86 using 59 PHA bins.
# Reduced chi-squared = 0.6115 for 57 degrees of freedom
# Null hypothesis probability = 9.909130e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.673e-08 1.287e-08
25- 50 8.364e-08 1.686e-08
50-150 5.733e-08 2.531e-08
15-150 2.077e-07 4.430e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.19416 (-2.50742 1.65457)
R1^2/D10^2 : 1.28795 (-0.755164 5.74939)
kT2 [keV] : 25.0918 (-20.7834 -25.0981)
R2^2/D10^2 : 2.58975E-03 (-0.00257591 0.165418)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.80 using 59 PHA bins.
# Reduced chi-squared = 0.6146 for 55 degrees of freedom
# Null hypothesis probability = 9.891393e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.638e-08 2.623e-08
25- 50 8.301e-08 3.682e-08
50-150 7.673e-08 4.443e-08
15-150 2.261e-07 9.961e-08
Peak spectrum fit
Power-law model
Time interval is from 3.280 sec. to 4.280 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.75675 ( -0.448301 0.565379 )
Norm@50keV : 3.81790E-03 ( -0.00155904 0.00161341 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.15 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.144270e-01
Photon flux (15-150 keV) in 1 sec: 0.885083 ( -0.196549 0.196826 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.1457e-08 ( -1.12455e-08 1.20889e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.280 sec. to 4.280 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.346108 ( -6.21759 2.6257 )
Epeak [keV] : 24.2883 ( -24.3698 7.1504 )
Norm@50keV : 0.456144 ( -0.496984 9113.65 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.99 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 56 degrees of freedom
# Null hypothesis probability = 2.710329e-01
Photon flux (15-150 keV) in 1 sec: 0.863025 ( -0.194964 0.194875 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.68103e-08 ( -9.1329e-09 1.11608e-08 ) ergs/cm2
Band function
Time interval is from 3.280 sec. to 4.280 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -5.56632E-02 ( -2.0849 3.27269 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 23.3457 ( -7.18961 8.21403 )
Norm@50keV : 0.242966 ( -0.24296 553.54 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.03 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 55 degrees of freedom
# Null hypothesis probability = 2.399494e-01
Photon flux (15-150 keV) in 1 sec: 0.868938 ( ) 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] : 6.67798 (-1.25529 1.4663)
R^2/D10^2 : 2.16421 (-1.24155 3.08366)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.12 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 57 degrees of freedom
# Null hypothesis probability = 2.989286e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.473e-08 6.391e-09
25- 50 1.838e-08 7.512e-09
50-150 2.560e-09 1.781e-09
15-150 3.566e-08 1.519e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.4448 (-8.80132 15.019)
Norm : 8.83396 (-3.3492 6.10668)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.64 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 57 degrees of freedom
# Null hypothesis probability = 2.831284e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.594e-08 5.410e-09
25- 50 1.610e-08 6.357e-09
50-150 6.624e-09 4.626e-09
15-150 3.867e-08 1.320e-08
Double BB
R1^2/D10^2 : 7.64553E+05 ( )
kT2 [keV] : 7.09419 (-1.41682 1.72985)
R2^2/D10^2 : 1.59249 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.50 using 59 PHA bins.
#Fit statistic : Chi-Squared = 60.32 using 59 PHA bins.
#Fit statistic : Chi-Squared = 60.29 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 55 degrees of freedom
# Reduced chi-squared = 1.097 for 55 degrees of freedom
# Reduced chi-squared = 1.096 for 55 degrees of freedom
# Null hypothesis probability = 2.840981e-01
# Null hypothesis probability = 2.895149e-01
# Null hypothesis probability = 2.903156e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.474e-08 7.875e-09
25- 50 1.823e-08 1.080e-08
50-150 3.317e-09 2.445e-09
15-150 3.628e-08 2.043e-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: 2.36426 ( -0.277675 0.309344 )
Norm@50keV : 2.56877E-03 ( -0.000565093 0.000552893 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.71 using 59 PHA bins.
# Reduced chi-squared = 0.6264 for 57 degrees of freedom
# Null hypothesis probability = 9.878372e-01
Photon flux (15-150 keV) in 9.288 sec: 0.465534 ( -0.0652982 0.0652983 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30916e-07 ( -3.97175e-08 4.12047e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57915 ( -2.14981 0.432184 )
Epeak [keV] : 18.9954 ( )
Norm@50keV : 8.15537E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.83 using 59 PHA bins.
# Reduced chi-squared = 0.6220 for 56 degrees of freedom
# Null hypothesis probability = 9.881826e-01
Photon flux (15-150 keV) in 9.288 sec: 0.455444 ( -0.067258 0.067571 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11776e-07 ( -4.42908e-08 5.30428e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.00940 ( -3.00908 -3.00908 )
beta : -2.65008 ( 2.65002 0.430555 )
Epeak [keV] : 22.7032 ( -22.7011 10.0151 )
Norm@50keV : 31.0451 ( -30.9925 442.231 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.84 using 59 PHA bins.
# Reduced chi-squared = 0.6153 for 55 degrees of freedom
# Null hypothesis probability = 9.890041e-01
Photon flux (15-150 keV) in 9.288 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) = 7.53e-08
S(50-100 keV) = 5.85e-08
T90 vs. Hardness ratio plot
T90 = 8.40000000596046 sec.
Hardness ratio (energy fluence ratio) = 0.776892
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.998532
Count Ratio (50-100 keV) / (15-25 keV) = 0.344781
Mask shadow pattern
IMX = -6.072943344518483E-01, IMY = -3.694722893306812E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-239.920000 -4.364000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3446 35.3866 4.2 32.2 60.8 0.7082 2.7 6.1 Her X-1
299.5974 35.2055 0.5 45.7 4.6 6.9751 23.6 0.4 Cyg X-1
308.0374 40.9002 2.8 44.1 -7.6 1.0773 4.1 4.6 Cyg X-3
326.3186 38.5034 0.0 53.4 -22.1 0.2777 0.7 12.9 Cyg X-2
290.5606 29.3326 2.5 47.6 17.5 1.9005 4.6 ------ UNKNOWN
247.8511 55.0912 2.2 12.0 62.2 0.7810 5.3 ------ UNKNOWN
240.2368 80.6440 2.3 14.0 -99.0 0.7041 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-4.364000 4.924000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.2620 35.3086 10.2 32.3 60.9 -0.0560 -1.1 9.8 Her X-1
299.6543 35.3107 275.3 45.7 4.4 0.0022 0.0 7.3 Cyg X-1
308.0936 40.7801 5.5 44.2 -7.6 -0.0871 -2.1 10.4 Cyg X-3
326.3144 38.4631 12.4 53.4 -22.1 -0.0712 -0.9 10.8 Cyg X-2
274.9401 27.0641 2.6 44.7 36.5 0.3254 4.5 ------ UNKNOWN
221.0411 36.7763 2.3 32.0 112.6 0.2392 5.0 ------ UNKNOWN
195.7428 41.2161 0.9 35.4 148.7 0.5309 12.3 ------ UNKNOWN
324.5757 49.7657 2.2 43.2 -28.8 0.2282 5.2 ------ UNKNOWN
135.9494 40.2726 2.7 59.0 -157.8 0.7193 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
90.980600 447.280600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.2626 35.2671 10.6 45.5 22.7 0.4862 1.1 10.6 Her X-1
265.6578 52.0320 3.5 47.3 -3.0 1.4144 3.3 ------ UNKNOWN
158.6548 52.5803 2.3 27.4 -107.8 1.1744 4.9 ------ UNKNOWN
Plot creation:
Sun May 31 13:15:15 EDT 2015