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
353.5289 45.9584 0.0193 50.2565 -173.8444 0.7368429 9.956 TRIG_00130679
Foreground time interval of the image:
-8.116 4.984 (delta_t = 13.100 [sec])
Background time interval of the image:
-299.672 -8.116 (delta_t = 291.556 [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 -8.116 sec. to 4.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.23705 ( -0.245086 0.268361 )
Norm@50keV : 3.57836E-03 ( -0.000662073 0.00064465 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.73 using 59 PHA bins.
# Reduced chi-squared = 0.8373 for 57 degrees of freedom
# Null hypothesis probability = 8.042988e-01
Photon flux (15-150 keV) in 13.1 sec: 0.604193 ( -0.0825994 0.0826489 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.4317e-07 ( -6.9491e-08 7.10557e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.116 sec. to 4.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.442971 ( -1.7848 1.41153 )
Epeak [keV] : 34.0964 ( -20.9762 8.05435 )
Norm@50keV : 4.18422E-02 ( -0.0418439 0.440686 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.80 using 59 PHA bins.
# Reduced chi-squared = 0.7644 for 56 degrees of freedom
# Null hypothesis probability = 9.026213e-01
Photon flux (15-150 keV) in 13.1 sec: 0.574347 ( -0.084993 0.085443 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.93145e-07 ( -6.53454e-08 7.51128e-08 ) ergs/cm2
Band function
Time interval is from -8.116 sec. to 4.984 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.736242 ( -0.795584 5.26468 )
beta : -3.56153 ( 3.48859 1.06773 )
Epeak [keV] : 33.4741 ( -9.29128 7.94913 )
Norm@50keV : 2.76910E-02 ( -0.0225216 3.81957 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.64 using 59 PHA bins.
# Reduced chi-squared = 0.7753 for 55 degrees of freedom
# Null hypothesis probability = 8.879064e-01
Photon flux (15-150 keV) in 13.1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.02745e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.36291 (-1.21899 1.34143)
R^2/D10^2 : 0.369401 (-0.153347 0.27175)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.12 using 59 PHA bins.
# Reduced chi-squared = 0.8092 for 57 degrees of freedom
# Null hypothesis probability = 8.480716e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.419e-08 2.143e-08
25- 50 1.901e-07 3.760e-08
50-150 8.175e-08 2.929e-08
15-150 3.561e-07 5.744e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 45.5370 (-12.6358 20.2806)
Norm : 3.65061 (-0.781323 1.05693)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.77 using 59 PHA bins.
# Reduced chi-squared = 0.7680 for 57 degrees of freedom
# Null hypothesis probability = 9.008117e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.142e-07 2.015e-08
25- 50 1.585e-07 2.608e-08
50-150 1.405e-07 5.496e-08
15-150 4.131e-07 7.434e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.59902 (-2.34366 6.80898)
R1^2/D10^2 : 7.55611 (-6.89312 12582.9)
kT2 [keV] : 11.0074 (-1.93288 3.52468)
R2^2/D10^2 : 0.166400 (-0.127881 0.146102)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.49 using 59 PHA bins.
# Reduced chi-squared = 0.7544 for 55 degrees of freedom
# Null hypothesis probability = 9.109750e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.079e-07 5.590e-08
25- 50 1.701e-07 9.072e-08
50-150 1.070e-07 6.668e-08
15-150 3.850e-07 2.001e-07
Peak spectrum fit
Power-law model
Time interval is from 3.420 sec. to 4.420 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52175 ( -0.385637 0.38541 )
Norm@50keV : 9.64937E-03 ( -0.0022558 0.00225046 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.25 using 59 PHA bins.
# Reduced chi-squared = 1.250 for 57 degrees of freedom
# Null hypothesis probability = 9.709881e-02
Photon flux (15-150 keV) in 1 sec: 1.21180 ( -0.296475 0.298752 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.12237e-08 ( -2.23327e-08 2.25175e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.420 sec. to 4.420 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.665535 ( -4.16609 1.18517 )
Epeak [keV] : 77.7035 ( -54.5817 -77.7939 )
Norm@50keV : 2.63948E-02 ( -0.0263162 4.18062 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.58 using 59 PHA bins.
# Reduced chi-squared = 1.260 for 56 degrees of freedom
# Null hypothesis probability = 9.093611e-02
Photon flux (15-150 keV) in 1 sec: 1.18095 ( -0.295838 0.30573 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.69929e-08 ( -2.75082e-08 2.44511e-08 ) ergs/cm2
Band function
Time interval is from 3.420 sec. to 4.420 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.05743 ( -0.786863 -0.786863 )
beta : -2.18809 ( 2.25995 0.929921 )
Epeak [keV] : 50.8129 ( -52.1225 71.5964 )
Norm@50keV : 0.248407 ( -0.248867 39.7535 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.14 using 59 PHA bins.
# Reduced chi-squared = 1.257 for 55 degrees of freedom
# Null hypothesis probability = 9.520281e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.54176e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.7447 (-2.92527 4.32697)
R^2/D10^2 : 0.196966 (-0.125837 0.275069)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.11 using 59 PHA bins.
# Reduced chi-squared = 1.265 for 57 degrees of freedom
# Null hypothesis probability = 8.572904e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.872e-09 3.590e-09
25- 50 2.874e-08 1.025e-08
50-150 3.541e-08 1.735e-08
15-150 7.203e-08 3.123e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-119.048 -199.363)
Norm : 5.01286 (-1.15936 1.47515)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.84 using 59 PHA bins.
# Reduced chi-squared = 1.243 for 57 degrees of freedom
# Null hypothesis probability = 1.028955e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.248e-08 7.425e-09
25- 50 2.401e-08 1.404e-08
50-150 5.266e-08 3.120e-08
15-150 8.916e-08 5.210e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.2094 (-3.50339 3.62117)
R1^2/D10^2 : 0.354593 (-0.225912 0.715385)
kT2 [keV] : 96.1248 (-79.9643 -99.3426)
R2^2/D10^2 : 3.46318E-04 (-0.000292287 0.0319098)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.11 using 59 PHA bins.
# Reduced chi-squared = 1.238 for 55 degrees of freedom
# Null hypothesis probability = 1.102406e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.544e-09 5.760e-09
25- 50 2.868e-08 1.808e-08
50-150 5.069e-08 2.419e-08
15-150 8.892e-08 4.495e-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: 2.23705 ( -0.245086 0.268361 )
Norm@50keV : 3.57836E-03 ( -0.000662073 0.00064465 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.73 using 59 PHA bins.
# Reduced chi-squared = 0.8373 for 57 degrees of freedom
# Null hypothesis probability = 8.042988e-01
Photon flux (15-150 keV) in 13.1 sec: 0.604193 ( -0.0825994 0.0826489 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.4317e-07 ( -6.9491e-08 7.10557e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.442971 ( -1.7848 1.41153 )
Epeak [keV] : 34.0964 ( -20.9762 8.05435 )
Norm@50keV : 4.18422E-02 ( -0.0418439 0.440686 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.80 using 59 PHA bins.
# Reduced chi-squared = 0.7644 for 56 degrees of freedom
# Null hypothesis probability = 9.026213e-01
Photon flux (15-150 keV) in 13.1 sec: 0.574347 ( -0.084993 0.085443 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.93145e-07 ( -6.53454e-08 7.51128e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.736242 ( -0.795584 5.26466 )
beta : -3.56153 ( 3.48859 1.06773 )
Epeak [keV] : 33.4741 ( -9.3452 7.94906 )
Norm@50keV : 2.76910E-02 ( -0.0225216 3.85636 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.64 using 59 PHA bins.
# Reduced chi-squared = 0.7753 for 55 degrees of freedom
# Null hypothesis probability = 8.879064e-01
Photon flux (15-150 keV) in 13.1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.02745e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.41e-07
S(50-100 keV) = 1.20e-07
T90 vs. Hardness ratio plot
T90 = 11.2480000257492 sec.
Hardness ratio (energy fluence ratio) = 0.851064
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.3083
Count Ratio (50-100 keV) / (15-25 keV) = 0.423048
Mask shadow pattern
IMX = -1.195712943438739E+00, IMY = 1.289594431820725E-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:
-299.672000 -8.116000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
349.5245 50.0493 2.6 55.1 -173.8 2.4988 4.5 ------ UNKNOWN
355.4470 56.6718 2.8 59.0 -166.2 4.3563 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-8.116000 4.984000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
353.5289 45.9584 1.2 50.3 -173.8 0.7369 10.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
111.428600 302.397300
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.0150 40.7808 8.8 33.2 97.3 -0.3730 -1.3 11.2 Cyg X-3
326.2971 38.4434 141.1 21.6 78.9 -0.0120 -0.1 9.4 Cyg X-2
307.3245 42.7390 2.9 32.9 101.0 1.0374 4.0 ------ UNKNOWN
82.9093 58.3358 2.9 51.9 -138.6 2.5097 4.0 ------ UNKNOWN
Plot creation:
Sun May 31 16:43:33 EDT 2015