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
328.8806 37.0609 0.0193 39.6702 -162.7117 1.8183116 10.003 TRIG_00435903
Foreground time interval of the image:
-3.112 106.056 (delta_t = 109.168 [sec])
Background time interval of the image:
-210.971 -3.112 (delta_t = 207.859 [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 1.024000
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 1.024000
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 1.024000
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 -3.112 sec. to 106.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55366 ( -0.240242 0.245279 )
Norm@50keV : 1.12222E-03 ( -0.000151177 0.000149357 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.49 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 57 degrees of freedom
# Null hypothesis probability = 3.184796e-01
Photon flux (15-150 keV) in 109.2 sec: 0.142217 ( -0.0188195 0.0189027 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15306e-06 ( -1.682e-07 1.7007e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.112 sec. to 106.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55949 ( -0.416253 0.241113 )
Epeak [keV] : 9999.33 ( -9999.36 -9999.36 )
Norm@50keV : 1.12069E-03 ( -0.00112413 0.00116414 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.50 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 56 degrees of freedom
# Null hypothesis probability = 2.856797e-01
Photon flux (15-150 keV) in 109.2 sec: 0.142474 ( -0.019119 0.018601 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14631e-06 ( -1.61474e-07 1.74458e-07 ) ergs/cm2
Band function
Time interval is from -3.112 sec. to 106.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33161 ( 1.33161 1.33161 )
beta : -1.55364 ( -0.245713 0.240393 )
Epeak [keV] : 14.5327 ( -14.5368 -14.5368 )
Norm@50keV : 2.35460E-03 ( -0.00116251 0.17047 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.49 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 55 degrees of freedom
# Null hypothesis probability = 2.549730e-01
Photon flux (15-150 keV) in 109.2 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] : 15.5157 (-2.60704 3.23486)
R^2/D10^2 : 1.37506E-02 (-0.00664766 0.0125323)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.04 using 59 PHA bins.
# Reduced chi-squared = 1.439 for 57 degrees of freedom
# Null hypothesis probability = 1.658029e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.522e-08 2.085e-08
25- 50 3.082e-07 6.514e-08
50-150 5.123e-07 1.322e-07
15-150 8.957e-07 1.692e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-85.8614 -199.363)
Norm : 0.576459 (-0.0743311 0.0743639)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.62 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 57 degrees of freedom
# Null hypothesis probability = 2.836194e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.567e-07 8.796e-08
25- 50 3.015e-07 1.675e-07
50-150 6.613e-07 3.650e-07
15-150 1.120e-06 6.164e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.10810 (-1.60491 3.04677)
R1^2/D10^2 : 1.32045 (-1.17332 18.31)
kT2 [keV] : 21.9801 (-4.99948 11.4124)
R2^2/D10^2 : 3.65833E-03 (-0.00279548 0.00551694)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.19 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 55 degrees of freedom
# Null hypothesis probability = 2.355473e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.847e-07 9.489e-08
25- 50 2.469e-07 9.425e-08
50-150 6.825e-07 2.655e-07
15-150 1.114e-06 3.932e-07
Peak spectrum fit
Power-law model
Time interval is from -0.436 sec. to 0.564 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23147 ( -0.25076 0.245548 )
Norm@50keV : 1.33153E-02 ( -0.00177922 0.00177891 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.71 using 59 PHA bins.
# Reduced chi-squared = 0.9949 for 57 degrees of freedom
# Null hypothesis probability = 4.859084e-01
Photon flux (15-150 keV) in 1 sec: 1.57021 ( -0.218849 0.219961 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33919e-07 ( -1.97024e-08 1.98322e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.436 sec. to 0.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.09658 ( )
Epeak [keV] : 35.6561 ( )
Norm@50keV : 3.51824E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.32 using 59 PHA bins.
# Reduced chi-squared = 0.9878 for 56 degrees of freedom
# Null hypothesis probability = 5.006286e-01
Photon flux (15-150 keV) in 1 sec: 1.57508 ( -0.22256 0.21501 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3396e-07 ( -1.968e-08 1.9261e-08 ) ergs/cm2
Band function
Time interval is from -0.436 sec. to 0.564 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.994787 ( 0.994818 0.994818 )
beta : -1.23142 ( 1.23146 0.250725 )
Epeak [keV] : 44.4991 ( -44.4932 -44.4932 )
Norm@50keV : 2.44199E-02 ( -0.0128789 2.02709 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.71 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 55 degrees of freedom
# Null hypothesis probability = 4.110447e-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] : 18.9357 (-3.64809 5.05987)
R^2/D10^2 : 8.30858E-02 (-0.0828146 0.0876215)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.24 using 59 PHA bins.
# Reduced chi-squared = 1.338 for 57 degrees of freedom
# Null hypothesis probability = 4.525219e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.863e-09 1.731e-09
25- 50 2.813e-08 6.675e-09
50-150 7.408e-08 2.054e-08
15-150 1.081e-07 2.311e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 6.52884 (-0.890629 0.890505)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.82 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 57 degrees of freedom
# Null hypothesis probability = 2.776300e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.627e-08 9.180e-09
25- 50 3.129e-08 1.737e-08
50-150 6.862e-08 3.856e-08
15-150 1.162e-07 6.420e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.98959 (-3.27257 3.74888)
R1^2/D10^2 : 0.725038 (-0.498979 2.54091)
kT2 [keV] : 55.4871 (-27.4719 -56.264)
R2^2/D10^2 : 2.82221E-03 (-0.00240925 0.015616)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.57 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 55 degrees of freedom
# Null hypothesis probability = 4.162842e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.227e-08 6.886e-09
25- 50 3.065e-08 1.650e-08
50-150 9.607e-08 5.196e-08
15-150 1.390e-07 7.090e-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: 1.55366 ( -0.240242 0.245279 )
Norm@50keV : 1.12222E-03 ( -0.000151177 0.000149357 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.49 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 57 degrees of freedom
# Null hypothesis probability = 3.184796e-01
Photon flux (15-150 keV) in 109.2 sec: 0.142217 ( -0.0188195 0.0189027 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15306e-06 ( -1.682e-07 1.7007e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55949 ( -0.416253 0.241113 )
Epeak [keV] : 9999.33 ( -9999.36 -9999.36 )
Norm@50keV : 1.12069E-03 ( -0.00112413 0.00116414 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.50 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 56 degrees of freedom
# Null hypothesis probability = 2.856797e-01
Photon flux (15-150 keV) in 109.2 sec: 0.142474 ( -0.019119 0.018601 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14631e-06 ( -1.61474e-07 1.74458e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33161 ( 1.33161 1.33161 )
beta : -1.55364 ( -0.245713 0.240393 )
Epeak [keV] : 14.5327 ( -14.5368 -14.5368 )
Norm@50keV : 2.35460E-03 ( -0.00116251 0.17047 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.49 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 55 degrees of freedom
# Null hypothesis probability = 2.549730e-01
Photon flux (15-150 keV) in 109.2 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) = 2.93e-07
S(50-100 keV) = 3.99e-07
T90 vs. Hardness ratio plot
T90 = 103.504000067711 sec.
Hardness ratio (energy fluence ratio) = 1.36177
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.948323
Count Ratio (50-100 keV) / (15-25 keV) = 0.97672
Mask shadow pattern
IMX = -7.918702745295987E-01, IMY = 2.464628093905808E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
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:
-210.971400 -3.112000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6189 21.9961 1.5 56.0 4.0 6.9833 7.5 1.4 Crab
308.0504 40.9378 5.5 53.1 -149.1 1.2270 2.1 2.9 Cyg X-3
326.2265 38.2847 4.3 41.2 -159.8 0.7004 2.7 3.4 Cyg X-2
41.3345 4.2020 2.2 40.9 61.9 3.1831 5.2 ------ UNKNOWN
90.1243 45.5032 3.7 49.7 -25.4 1.1650 3.1 ------ UNKNOWN
101.8581 42.4079 2.7 58.7 -26.2 5.3097 4.4 ------ UNKNOWN
336.7820 77.3938 3.8 41.1 -98.2 2.7380 3.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-3.112000 106.056000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.5688 21.9505 4.3 55.9 4.1 -2.0005 -2.7 5.3 Crab
308.1532 40.7253 0.0 53.1 -149.4 -0.3643 -0.8 13.8 Cyg X-3
326.2080 38.5248 9.7 41.1 -159.4 -0.2201 -1.2 12.3 Cyg X-2
328.8805 37.0609 1.2 39.7 -162.7 1.8183 9.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
699.728610 962.599500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6288 22.0153 0.3 32.1 -36.2 10.8297 42.8 0.2 Crab
92.5576 1.6634 2.1 50.8 -17.7 2.4918 5.4 ------ UNKNOWN
21.7003 82.6703 2.5 51.8 -139.6 4.9553 4.6 ------ UNKNOWN
Plot creation:
Sat May 30 23:44:20 EDT 2015