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
282.710 31.990 0.000 18.273 -44.240 0.163 7.746 TRIG_00176620
Image time interval: 0.000 to 8.192 [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 8.192000
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 8.192000
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 8.192000
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 -1.968 sec. to 126.768 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88922 ( -0.228046 0.242888 )
Norm@50keV : 5.57795E-04 ( -8.94779e-05 8.70886e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.77 using 59 PHA bins.
# Reduced chi-squared = 0.7329 for 57 degrees of freedom
# Null hypothesis probability = 9.349251e-01
Photon flux (15-150 keV) in 128.7 sec: 7.96855E-02 ( -0.0101102 0.0101106 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.59953e-07 ( -1.02435e-07 1.05296e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.968 sec. to 126.768 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30705 ( -1.10097 0.863022 )
Epeak [keV] : 50.2172 ( -40.4623 -50.2172 )
Norm@50keV : 1.20671E-03 ( -0.00120671 0.00409062 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.50 using 59 PHA bins.
# Reduced chi-squared = 0.7232 for 56 degrees of freedom
# Null hypothesis probability = 9.409184e-01
Photon flux (15-150 keV) in 128.7 sec: 7.80610E-02 ( -0.0103637 0.0103769 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.21588e-07 ( -1.13147e-07 1.19257e-07 ) ergs/cm2
Band function
Time interval is from -1.968 sec. to 126.768 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30707 ( -4.35656 1.41228 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 50.2081 ( -32.3987 -50.2081 )
Norm@50keV : 1.20654E-03 ( -0.0007132 0.00410702 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.50 using 59 PHA bins.
# Reduced chi-squared = 0.7363 for 55 degrees of freedom
# Null hypothesis probability = 9.281471e-01
Photon flux (15-150 keV) in 128.7 sec: 7.91058E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.22302e-07 ( -6.21401e-07 -1.14283e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.98044 (-1.47168 1.81038)
R^2/D10^2 : 3.76990E-02 (-0.0175523 0.0312279)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.33 using 59 PHA bins.
# Reduced chi-squared = 0.9180 for 57 degrees of freedom
# Null hypothesis probability = 6.507578e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.836e-08 2.282e-08
25- 50 2.439e-07 4.440e-08
50-150 1.266e-07 4.055e-08
15-150 4.688e-07 9.138e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.9855 (-27.2751 55.4324)
Norm : 0.377218 (-0.0642682 0.0852261)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.49 using 59 PHA bins.
# Reduced chi-squared = 0.7104 for 57 degrees of freedom
# Null hypothesis probability = 9.518176e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.259e-07 2.194e-08
25- 50 2.066e-07 3.366e-08
50-150 2.891e-07 1.431e-07
15-150 6.215e-07 1.545e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.46715 (-1.86001 1.91817)
R1^2/D10^2 : 0.138903 (-0.0810242 0.146838)
kT2 [keV] : 21.9016 (-7.23868 18.0257)
R2^2/D10^2 : 1.31863E-03 (-0.00115939 0.00537468)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.41 using 59 PHA bins.
# Reduced chi-squared = 0.7165 for 55 degrees of freedom
# Null hypothesis probability = 9.441766e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.249e-07 6.428e-08
25- 50 2.080e-07 1.077e-07
50-150 3.011e-07 1.707e-07
15-150 6.340e-07 3.390e-07
Peak spectrum fit
Power-law model
Time interval is from 90.184 sec. to 91.184 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55475 ( -0.396908 0.414946 )
Norm@50keV : 3.62834E-03 ( -0.000961393 0.000942157 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.16 using 59 PHA bins.
# Reduced chi-squared = 0.8625 for 57 degrees of freedom
# Null hypothesis probability = 7.604141e-01
Photon flux (15-150 keV) in 1 sec: 0.459962 ( -0.113073 0.113161 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.41331e-08 ( -9.55771e-09 9.90023e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 90.184 sec. to 91.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.268648 ( -2.57924 1.48401 )
Epeak [keV] : 62.1642 ( -18.1381 -62.1642 )
Norm@50keV : 1.78182E-02 ( -0.0178182 0.410401 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.44 using 59 PHA bins.
# Reduced chi-squared = 0.8472 for 56 degrees of freedom
# Null hypothesis probability = 7.852857e-01
Photon flux (15-150 keV) in 1 sec: 0.441265 ( -0.115555 0.115792 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08126e-08 ( -9.612e-09 1.07489e-08 ) ergs/cm2
Band function
Time interval is from 90.184 sec. to 91.184 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.357243 ( -1.25439 4.00337 )
beta : -9.37159 ( 9.37167 19.3717 )
Epeak [keV] : 64.3688 ( -22.8186 229.931 )
Norm@50keV : 1.57248E-02 ( -0.0157396 111.071 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.45 using 59 PHA bins.
# Reduced chi-squared = 0.8628 for 55 degrees of freedom
# Null hypothesis probability = 7.552840e-01
Photon flux (15-150 keV) in 1 sec: 0.443672 ( ) 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] : 13.5116 (-3.30989 4.58616)
R^2/D10^2 : 7.79793E-02 (-0.0505196 0.133901)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.97 using 59 PHA bins.
# Reduced chi-squared = 0.8591 for 57 degrees of freedom
# Null hypothesis probability = 7.664924e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.015e-09 1.512e-09
25- 50 1.082e-08 5.022e-09
50-150 1.276e-08 6.978e-09
15-150 2.660e-08 1.571e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 165.249 (-101.155 -165.418)
Norm : 1.89752 (-0.47781 0.622143)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.35 using 59 PHA bins.
# Reduced chi-squared = 0.8482 for 57 degrees of freedom
# Null hypothesis probability = 7.858841e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.830e-09 2.840e-09
25- 50 9.074e-09 5.260e-09
50-150 1.862e-08 1.134e-08
15-150 3.252e-08 1.953e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.40847 (-6.40604 -6.40604)
R1^2/D10^2 : 0.479958 (-0.480462 -0.480462)
kT2 [keV] : 18.3418 (-18.3394 -18.3394)
R2^2/D10^2 : 2.09642E-02 (-0.0209776 0.123712)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.30 using 59 PHA bins.
# Reduced chi-squared = 0.8601 for 55 degrees of freedom
# Null hypothesis probability = 7.601204e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.265e-09 2.460e-09
25- 50 9.864e-09 5.230e-09
50-150 1.654e-08 1.043e-08
15-150 3.067e-08 1.590e-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: 1.93637 ( -0.386434 0.432576 )
Norm@50keV : 4.97516E-04 ( -0.000144961 0.000139491 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.08 using 59 PHA bins.
# Reduced chi-squared = 0.8786 for 57 degrees of freedom
# Null hypothesis probability = 7.301234e-01
Photon flux (15-150 keV) in 52.29 sec: 7.25267E-02 ( -0.0159905 0.0159921 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39323e-07 ( -6.48417e-08 6.85182e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05779 ( -4.03745 1.0876 )
Epeak [keV] : 41.4961 ( )
Norm@50keV : 1.70820E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.23 using 59 PHA bins.
# Reduced chi-squared = 0.8791 for 56 degrees of freedom
# Null hypothesis probability = 7.269745e-01
Photon flux (15-150 keV) in 52.29 sec: 7.06743E-02 ( -0.0162163 0.0162954 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.15456e-07 ( -7.32363e-08 8.0456e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98733 ( -14.8589 -4.98733 )
beta : -2.50936 ( -1.50334 0.650654 )
Epeak [keV] : 27.4363 ( -7.41354 5.69434 )
Norm@50keV : 46.8053 ( -10.0472 361.094 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.07 using 59 PHA bins.
# Reduced chi-squared = 0.8558 for 55 degrees of freedom
# Null hypothesis probability = 7.677487e-01
Photon flux (15-150 keV) in 52.29 sec: 7.12705E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17512e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.92e-07
S(50-100 keV) = 2.07e-07
T90 vs. Hardness ratio plot
T90 = 115.592000007629 sec.
Hardness ratio (energy fluence ratio) = 1.07812
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.25162
Count Ratio (50-100 keV) / (15-25 keV) = 0.672952
Mask shadow pattern
IMX = 0.236553484601, IMY = 0.230361441268
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
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:
-299.176000 -1.968000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3190 35.4066 5.0 33.9 -0.9 0.6028 2.3 7.8 Her X-1
288.8076 10.9863 2.2 36.1 -73.3 2.7361 5.2 2.5 GRS 1915+105
299.5946 35.1969 0.2 11.2 -96.8 12.1903 61.3 0.4 Cyg X-1
308.1361 40.9574 1.1 9.4 -146.8 2.2466 10.1 1.2 Cyg X-3
326.0702 38.2469 5.8 22.5 -167.1 0.4380 2.0 6.6 Cyg X-2
245.1290 27.8874 2.4 44.7 -3.3 1.8280 4.8 ------ UNKNOWN
322.7690 31.8934 2.7 24.2 -150.2 0.8818 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.968000 50.324600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3714 35.1700 8.0 34.0 -1.3 -0.1388 -1.4 11.2 Her X-1
288.7794 10.9640 217.5 36.1 -73.2 -0.0081 -0.1 1.6 GRS 1915+105
299.6132 35.2059 13.5 11.2 -96.8 0.0570 0.9 1.1 Cyg X-1
307.9142 40.9739 5.4 9.2 -146.3 0.1425 2.1 9.0 Cyg X-3
326.1592 38.2582 7.7 22.5 -167.2 0.1099 1.5 3.9 Cyg X-2
3.1404 32.6733 2.5 51.0 173.1 0.8927 4.7 ------ UNKNOWN
282.7250 32.0169 1.8 18.2 -44.2 0.4560 6.3 ------ UNKNOWN
0.5850 18.4030 2.5 58.4 -171.6 1.8084 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
89.724600 302.935500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3107 35.4136 5.9 23.8 25.4 -0.3286 -2.0 8.4 Her X-1
268.4111 -1.4264 6.3 36.1 -55.9 0.5278 1.8 3.0 SW J1753.5-0127
288.8187 10.9604 1.0 21.8 -97.0 2.1556 12.2 1.5 GRS 1915+105
299.5894 35.2006 0.2 14.4 171.9 9.0743 62.7 0.1 Cyg X-1
308.0797 40.9569 1.3 22.2 158.4 1.5242 8.8 1.4 Cyg X-3
326.1803 38.1885 6.2 35.8 167.0 0.4388 1.9 8.0 Cyg X-2
299.2917 70.8156 2.1 39.9 107.7 3.3849 5.6 ------ UNKNOWN
315.8876 -3.7829 2.0 47.7 -128.3 4.2203 5.9 ------ UNKNOWN
Plot creation:
Thu Oct 8 20:41:37 EDT 2015