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
345.4644 38.6640 0.0156 11.8595 98.6082 0.5388982 12.335 TRIG_00163170
Foreground time interval of the image:
-8.144 10.812 (delta_t = 18.956 [sec])
Background time interval of the image:
-299.200 -8.144 (delta_t = 291.056 [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 -8.144 sec. to 10.812 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97893 ( -0.22298 0.238947 )
Norm@50keV : 1.51625E-03 ( -0.000255455 0.000250574 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.67 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.265903e-01
Photon flux (15-150 keV) in 18.96 sec: 0.225262 ( -0.0283203 0.0283247 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64839e-07 ( -4.16631e-08 4.32275e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.144 sec. to 10.812 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.360024 ( -1.49294 1.12815 )
Epeak [keV] : 39.4462 ( -8.14345 11.7991 )
Norm@50keV : 1.42688E-02 ( -0.0142689 0.104049 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.98 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 56 degrees of freedom
# Null hypothesis probability = 4.020825e-01
Photon flux (15-150 keV) in 18.96 sec: 0.215296 ( -0.028334 0.028601 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.27983e-07 ( -3.90371e-08 4.5485e-08 ) ergs/cm2
Band function
Time interval is from -8.144 sec. to 10.812 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.401579 ( -0.825227 1.9284 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 39.4554 ( -8.15407 11.7883 )
Norm@50keV : 1.34893E-02 ( -0.0134893 0.10495 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.98 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 55 degrees of freedom
# Null hypothesis probability = 3.658249e-01
Photon flux (15-150 keV) in 18.96 sec: 0.215529 ( 6.78447 -0.028302 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28106e-07 ( -2.27973e-07 -3.92963e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.69355 (-1.22808 1.40727)
R^2/D10^2 : 0.123585 (-0.0499228 0.0831017)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.26 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 57 degrees of freedom
# Null hypothesis probability = 2.943543e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.433e-08 9.338e-09
25- 50 1.054e-07 1.945e-08
50-150 5.024e-08 1.684e-08
15-150 2.000e-07 3.382e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 61.8463 (-18.8311 33.0226)
Norm : 1.18016 (-0.214292 0.259638)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.84 using 59 PHA bins.
# Reduced chi-squared = 1.050 for 57 degrees of freedom
# Null hypothesis probability = 3.729135e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.650e-08 9.139e-09
25- 50 8.679e-08 1.285e-08
50-150 1.012e-07 3.756e-08
15-150 2.445e-07 4.863e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.20088 (-4.53344 28.4341)
R1^2/D10^2 : 0.602882 (-0.481945 -0.602884)
kT2 [keV] : 13.0962 (-3.43578 20.4848)
R2^2/D10^2 : 2.94583E-02 (-0.0291081 0.0892309)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.81 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 55 degrees of freedom
# Null hypothesis probability = 3.718084e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.277e-08 2.818e-08
25- 50 9.386e-08 4.778e-08
50-150 7.794e-08 4.628e-08
15-150 2.246e-07 1.139e-07
Peak spectrum fit
Power-law model
Time interval is from 0.092 sec. to 1.092 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85134 ( -0.413971 0.478306 )
Norm@50keV : 4.02285E-03 ( -0.00120787 0.0011265 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.66 using 59 PHA bins.
# Reduced chi-squared = 0.9414 for 57 degrees of freedom
# Null hypothesis probability = 6.012115e-01
Photon flux (15-150 keV) in 1 sec: 0.565762 ( -0.125118 0.125131 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.69886e-08 ( -1.04854e-08 1.10282e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.092 sec. to 1.092 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75606 ( )
Epeak [keV] : 115.905 ( )
Norm@50keV : 4.54262E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.64 using 59 PHA bins.
# Reduced chi-squared = 0.9579 for 56 degrees of freedom
# Null hypothesis probability = 5.645287e-01
Photon flux (15-150 keV) in 1 sec: 0.563983 ( -0.125378 0.126045 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.66004e-08 ( -1.08076e-08 1.13501e-08 ) ergs/cm2
Band function
Time interval is from 0.092 sec. to 1.092 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -3.75885 ( 2.23189 3.75885 )
beta : -1.85134 ( -0.478304 0.41414 )
Epeak [keV] : 76.1523 ( -76.1523 -76.1523 )
Norm@50keV : 0.546762 ( -0.164167 0.153108 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.66 using 59 PHA bins.
# Reduced chi-squared = 0.9756 for 55 degrees of freedom
# Null hypothesis probability = 5.259943e-01
Photon flux (15-150 keV) in 1 sec: 0.559717 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31935e-15 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.1861 (-3.67899 4.37004)
R^2/D10^2 : 9.67423E-02 (-0.0617103 0.210133)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.93 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.364133e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.566e-09 1.745e-09
25- 50 1.247e-08 5.927e-09
50-150 1.382e-08 6.982e-09
15-150 2.986e-08 1.292e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 96.1536 (-52.223 -96.1536)
Norm : 2.52509 (-0.645258 0.999411)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.95 using 59 PHA bins.
# Reduced chi-squared = 0.9465 for 57 degrees of freedom
# Null hypothesis probability = 5.901728e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.598e-09 3.987e-09
25- 50 1.132e-08 6.332e-09
50-150 1.793e-08 1.410e-08
15-150 3.585e-08 2.406e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.48577 (-1.3938 1.94212)
R1^2/D10^2 : 12.9314 (-11.3439 253.676)
kT2 [keV] : 18.1074 (-4.94016 8.58203)
R2^2/D10^2 : 2.65314E-02 (-0.0198894 0.0392515)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.18 using 59 PHA bins.
# Reduced chi-squared = 0.9124 for 55 degrees of freedom
# Null hypothesis probability = 6.589506e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.533e-09 4.128e-09
25- 50 9.462e-09 5.190e-09
50-150 1.926e-08 1.240e-08
15-150 3.625e-08 1.947e-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: 1.97893 ( -0.22298 0.238947 )
Norm@50keV : 1.51625E-03 ( -0.000255455 0.000250574 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.67 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.265903e-01
Photon flux (15-150 keV) in 18.96 sec: 0.225262 ( -0.0283203 0.0283247 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64839e-07 ( -4.16631e-08 4.32275e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.360024 ( -1.49294 1.12815 )
Epeak [keV] : 39.4462 ( -8.14345 11.7991 )
Norm@50keV : 1.42688E-02 ( -0.0142689 0.104049 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.98 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 56 degrees of freedom
# Null hypothesis probability = 4.020825e-01
Photon flux (15-150 keV) in 18.96 sec: 0.215296 ( -0.028334 0.028601 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.27983e-07 ( -3.90371e-08 4.5485e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.401579 ( -0.825227 1.9284 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 39.4554 ( -8.15407 11.7883 )
Norm@50keV : 1.34893E-02 ( -0.0134893 0.10495 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.98 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 55 degrees of freedom
# Null hypothesis probability = 3.658249e-01
Photon flux (15-150 keV) in 18.96 sec: 0.215529 ( 6.78447 -0.028302 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28106e-07 ( -2.27973e-07 -3.92963e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 7.92e-08
S(50-100 keV) = 8.04e-08
T90 vs. Hardness ratio plot
T90 = 15.6960000097752 sec.
Hardness ratio (energy fluence ratio) = 1.01515
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.26875
Count Ratio (50-100 keV) / (15-25 keV) = 0.524881
Mask shadow pattern
IMX = -3.143115528553913E-02, IMY = -2.076287152403848E-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:
-299.200000 -8.144000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5917 35.1970 0.2 24.7 -90.3 13.4641 48.1 0.3 Cyg X-1
308.1177 40.9772 1.2 16.7 -79.3 2.2403 10.0 1.5 Cyg X-3
326.0304 38.4614 9.2 4.1 -121.8 0.2627 1.3 10.7 Cyg X-2
25.4694 43.0650 3.3 40.3 70.8 3.5175 3.5 ------ UNKNOWN
36.6593 71.3728 3.7 44.2 27.7 1.6530 3.1 ------ UNKNOWN
270.2917 47.5686 3.6 42.4 -57.1 1.9992 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-8.144000 10.812000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.6854 35.0861 3.4 24.7 -90.6 0.1936 3.4 8.4 Cyg X-1
308.2493 41.1214 8.3 16.6 -78.9 0.0662 1.4 11.9 Cyg X-3
326.1296 38.2587 8.4 4.1 -124.7 0.0555 1.4 4.3 Cyg X-2
55.6849 76.0082 2.4 49.5 21.4 0.6834 4.8 ------ UNKNOWN
355.7701 31.0694 2.3 22.7 110.3 0.2673 5.0 ------ UNKNOWN
345.4644 38.6640 0.9 11.9 98.6 0.5387 12.3 ------ UNKNOWN
294.4867 30.1983 2.2 30.8 -95.9 0.3683 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
70.500600 302.887100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5865 35.2111 0.5 36.4 -86.3 11.4760 24.8 0.6 Cyg X-1
308.1540 40.9531 1.8 28.5 -78.9 1.6611 6.5 2.0 Cyg X-3
326.0033 38.1607 0.0 15.2 -91.4 0.3380 1.9 12.5 Cyg X-2
18.3254 8.2741 2.7 42.4 121.7 3.1473 4.3 ------ UNKNOWN
52.5793 55.6210 2.8 46.6 40.3 2.9994 4.2 ------ UNKNOWN
9.5439 9.1569 2.6 36.6 131.9 1.5634 4.5 ------ UNKNOWN
Plot creation:
Sun May 31 15:12:46 EDT 2015