Special notes of this burst
Image
Pre-slew 15.0-50.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name
331.668 60.020 0.000 17.079 -93.128 0.611 7.055 TRIG_00526270
Image time interval: 0.000 to 64.000 [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
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
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)
The mask-weighted light curves based on cleaned DPHs
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 -12.088 sec. to 51.400 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70744 ( -0.297467 0.315989 )
Norm@50keV : 9.98657E-04 ( -0.000202201 0.000196035 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.49 using 59 PHA bins.
# Reduced chi-squared = 0.7629 for 57 degrees of freedom
# Null hypothesis probability = 9.063198e-01
Photon flux (15-150 keV) in 63.49 sec: 0.132979 ( -0.0219992 0.0220003 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.86676e-07 ( -1.21587e-07 1.27257e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.088 sec. to 51.400 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.874423 ( -2.1644 1.22121 )
Epeak [keV] : 54.9382 ( )
Norm@50keV : 3.07840E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.67 using 59 PHA bins.
# Reduced chi-squared = 0.7620 for 56 degrees of freedom
# Null hypothesis probability = 9.051176e-01
Photon flux (15-150 keV) in 63.49 sec: 0.128029 ( -0.023612 0.023824 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.22482e-07 ( -1.40417e-07 1.70283e-07 ) ergs/cm2
Band function
Time interval is from -12.088 sec. to 51.400 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -4.07017E-02 ( 0.360907 0.360907 )
beta : -2.12755 ( 2.13737 0.636982 )
Epeak [keV] : 41.0084 ( -40.4865 115.811 )
Norm@50keV : 1.12714E-02 ( -0.0129614 99.0731 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.04 using 59 PHA bins.
# Reduced chi-squared = 0.7644 for 55 degrees of freedom
# Null hypothesis probability = 9.003865e-01
Photon flux (15-150 keV) in 63.49 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.44799e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.8367 (-1.86191 2.3339)
R^2/D10^2 : 4.74137E-02 (-0.0242376 0.0471392)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.95 using 59 PHA bins.
# Reduced chi-squared = 0.8061 for 57 degrees of freedom
# Null hypothesis probability = 8.524546e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.363e-08 2.266e-08
25- 50 2.042e-07 5.127e-08
50-150 1.339e-07 5.844e-08
15-150 4.117e-07 1.043e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 101.619 (-46.9121 -103.554)
Norm : 0.588671 (-0.112675 0.151683)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.84 using 59 PHA bins.
# Reduced chi-squared = 0.7515 for 57 degrees of freedom
# Null hypothesis probability = 9.179911e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.769e-08 2.321e-08
25- 50 1.695e-07 5.965e-08
50-150 2.771e-07 1.833e-07
15-150 5.443e-07 2.915e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.40903 (-7.63178 2.45114)
R1^2/D10^2 : 7.27446E-02 (-0.0425119 0.24551)
kT2 [keV] : 200.000 (-198.507 -200)
R2^2/D10^2 : 1.32589E-05 (-8.81972e-06 0.000104162)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.52 using 59 PHA bins.
#Fit statistic : Chi-Squared = 41.34 using 59 PHA bins.
# Reduced chi-squared = 0.7549 for 55 degrees of freedom
# Reduced chi-squared = 0.7516 for 55 degrees of freedom
# Null hypothesis probability = 9.104873e-01
# Null hypothesis probability = 9.137871e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.365e-08 3.888e-08
25- 50 1.928e-07 1.024e-07
50-150 3.072e-07 1.579e-07
15-150 5.836e-07 2.674e-07
Peak spectrum fit
Power-law model
Time interval is from 13.108 sec. to 14.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.605754 ( -1.35167 0.877897 )
Norm@50keV : 3.46508E-03 ( -0.00346468 0.00155806 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.09 using 59 PHA bins.
# Reduced chi-squared = 0.8261 for 57 degrees of freedom
# Null hypothesis probability = 8.225578e-01
Photon flux (15-150 keV) in 1 sec: 0.404255 6.78454E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.41923e-08 ( -1.86097e-08 1.88212e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.108 sec. to 14.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.642630 ( -1.46365 0.841311 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.53720E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.10 using 59 PHA bins.
# Reduced chi-squared = 0.8411 for 56 degrees of freedom
# Null hypothesis probability = 7.955851e-01
Photon flux (15-150 keV) in 1 sec: 0.409296 5.99274E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.91485e-16 ( 0 0 ) ergs/cm2
Band function
Time interval is from 13.108 sec. to 14.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -10.00000 ( 10 10 )
beta : -0.605445 ( -0.877483 1.35486 )
Epeak [keV] : 17.3514 ( -17.3514 -17.3514 )
Norm@50keV : 0.470910 ( -0.470883 0.211777 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.09 using 59 PHA bins.
# Reduced chi-squared = 0.8561 for 55 degrees of freedom
# Null hypothesis probability = 7.672258e-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] : 33.6918 (-18.7916 -34.1118)
R^2/D10^2 : 4.36115E-03 (-0.00412997 0.0401245)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.14 using 59 PHA bins.
# Reduced chi-squared = 0.8621 for 57 degrees of freedom
# Null hypothesis probability = 7.611187e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.192e-10 4.741e-10
25- 50 4.639e-09 2.965e-09
50-150 3.522e-08 2.223e-08
15-150 4.058e-08 2.402e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-124.247 -199.363)
Norm : 1.62335 (-0.706098 0.706123)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.56 using 59 PHA bins.
# Reduced chi-squared = 0.8870 for 57 degrees of freedom
# Null hypothesis probability = 7.137438e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.042e-09 2.714e-09
25- 50 7.776e-09 5.130e-09
50-150 1.705e-08 1.110e-08
15-150 2.887e-08 1.858e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.5084 (-12.4785 29.5872)
R1^2/D10^2 : 4.97411E-02 (-0.0486745 1.60413)
kT2 [keV] : 199.363 (-199.363 -199.363)
R2^2/D10^2 : 1.17300E-04 (-0.000116932 0.00657636)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.83 using 59 PHA bins.
#Fit statistic : Chi-Squared = 46.38 using 59 PHA bins.
# Reduced chi-squared = 0.8515 for 55 degrees of freedom
# Reduced chi-squared = 0.8432 for 55 degrees of freedom
# Null hypothesis probability = 7.753209e-01
# Null hypothesis probability = 7.896606e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.579e-09 2.084e-09
25- 50 3.622e-09 1.748e-09
50-150 4.007e-08 2.442e-08
15-150 4.727e-08 2.569e-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: 1.70744 ( -0.297467 0.315989 )
Norm@50keV : 9.98657E-04 ( -0.000202201 0.000196035 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.49 using 59 PHA bins.
# Reduced chi-squared = 0.7629 for 57 degrees of freedom
# Null hypothesis probability = 9.063198e-01
Photon flux (15-150 keV) in 63.49 sec: 0.132979 ( -0.0219992 0.0220003 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.86676e-07 ( -1.21587e-07 1.27257e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.874423 ( -2.1644 1.22121 )
Epeak [keV] : 54.9382 ( )
Norm@50keV : 3.07840E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.67 using 59 PHA bins.
# Reduced chi-squared = 0.7620 for 56 degrees of freedom
# Null hypothesis probability = 9.051176e-01
Photon flux (15-150 keV) in 63.49 sec: 0.128029 ( -0.023612 0.023824 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.22482e-07 ( -1.40417e-07 1.70283e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -4.07017E-02 ( 0.360907 0.360907 )
beta : -2.12755 ( 2.13737 0.636982 )
Epeak [keV] : 41.0084 ( -40.4865 94.7203 )
Norm@50keV : 1.12714E-02 ( -0.0129614 99.0731 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.04 using 59 PHA bins.
# Reduced chi-squared = 0.7644 for 55 degrees of freedom
# Null hypothesis probability = 9.003865e-01
Photon flux (15-150 keV) in 63.49 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.44799e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.59e-07
S(50-100 keV) = 1.95e-07
T90 vs. Hardness ratio plot
T90 = 60.0960000157356 sec.
Hardness ratio (energy fluence ratio) = 1.22642
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.49628
Count Ratio (50-100 keV) / (15-25 keV) = 0.706809
Mask shadow pattern
IMX = -0.0167664741587, IMY = 0.306780430715
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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:
-179.000000 -12.088000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3079 35.2519 27.9 48.5 165.4 0.3375 0.4 9.1 Her X-1
299.7150 35.1965 7.7 17.1 125.1 0.5066 1.5 6.1 Cyg X-1
308.0571 40.9178 5.2 8.4 128.4 0.6634 2.2 3.2 Cyg X-3
326.1631 38.4380 5.9 8.8 18.3 0.5349 2.0 7.0 Cyg X-2
280.2176 41.5541 3.2 27.6 160.0 1.2357 3.6 ------ UNKNOWN
220.6215 54.1858 4.9 58.8 -159.2 4.6168 2.4 ------ UNKNOWN
219.7291 56.3363 2.9 58.0 -156.8 6.4694 4.0 ------ UNKNOWN
26.2102 60.8230 2.4 41.8 -73.8 5.9111 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-12.088000 51.400000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.2533 35.4166 7.0 48.5 165.6 -0.5765 -1.6 10.9 Her X-1
299.7401 35.0869 7.6 17.2 124.7 -0.2118 -1.5 10.1 Cyg X-1
308.0905 41.1169 6.0 8.3 129.4 0.2501 1.9 9.9 Cyg X-3
326.1411 38.3929 19.0 8.9 18.6 -0.0765 -0.6 4.5 Cyg X-2
308.1004 10.6818 2.6 35.4 80.8 1.4713 4.4 ------ UNKNOWN
330.8527 42.3806 2.4 9.5 -15.3 0.6139 4.9 ------ UNKNOWN
331.7104 59.9925 2.0 17.1 -93.0 0.7846 5.7 ------ UNKNOWN
257.7541 65.7044 2.3 38.0 -152.0 0.8403 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
112.500610 864.300600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.6082 35.2759 2.8 32.2 107.2 4.0513 4.1 4.5 Cyg X-1
308.0558 40.9644 2.3 24.0 101.0 3.5277 5.1 2.6 Cyg X-3
326.2170 38.2738 3.4 22.0 64.3 2.2100 3.4 3.6 Cyg X-2
358.5633 10.1933 3.1 53.7 19.3 9.2494 3.7 ------ UNKNOWN
9.9136 56.7122 3.3 20.0 -44.6 1.7727 3.5 ------ UNKNOWN
217.2498 50.6595 4.2 57.4 -170.4 7.9462 2.7 ------ UNKNOWN
202.7436 54.2318 4.7 58.7 -159.3 13.0168 2.5 ------ UNKNOWN
35.0574 36.2211 2.4 46.2 -35.8 4.8956 4.7 ------ UNKNOWN
200.0790 55.8704 3.6 58.0 -156.8 14.0540 3.2 ------ UNKNOWN
180.9805 64.8836 3.4 53.2 -142.2 11.2251 3.4 ------ UNKNOWN
Plot creation:
Thu Oct 8 20:20:04 EDT 2015