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
233.7110 10.9796 0.0087 2.3963 178.5098 1.0837381 22.082 TRIG_00657286
Foreground time interval of the image:
-6.288 7.776 (delta_t = 14.064 [sec])
Background time interval of the image:
-463.743 -446.933 (delta_t = 16.811 [sec])
-239.144 -6.288 (delta_t = 232.856 [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 -6.288 sec. to 7.776 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20191 ( -0.120308 0.119024 )
Norm@50keV : 4.86950E-03 ( -0.000322747 0.000322725 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.98 using 59 PHA bins.
# Reduced chi-squared = 0.7891 for 57 degrees of freedom
# Null hypothesis probability = 8.754914e-01
Photon flux (15-150 keV) in 14.06 sec: 0.571735 ( -0.0392871 0.0393588 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.94231e-07 ( -5.09502e-08 5.12359e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.288 sec. to 7.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.963717 ( -0.495008 0.295476 )
Epeak [keV] : 235.665 ( -235.665 -235.665 )
Norm@50keV : 6.30062E-03 ( -0.00167587 0.00427238 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.17 using 59 PHA bins.
# Reduced chi-squared = 0.7888 for 56 degrees of freedom
# Null hypothesis probability = 8.735262e-01
Photon flux (15-150 keV) in 14.06 sec: 0.564791 ( -0.041395 0.041368 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.83114e-07 ( -5.60797e-08 5.55961e-08 ) ergs/cm2
Band function
Time interval is from -6.288 sec. to 7.776 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.353390 ( 0.481418 4.63958 )
beta : -1.31307 ( 1.30979 0.190335 )
Epeak [keV] : 74.6105 ( -72.4781 249.109 )
Norm@50keV : 1.51561E-02 ( -0.0161554 271570 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.51 using 59 PHA bins.
# Reduced chi-squared = 0.7911 for 55 degrees of freedom
# Null hypothesis probability = 8.681301e-01
Photon flux (15-150 keV) in 14.06 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] : 18.8227 (-1.69355 1.92158)
R^2/D10^2 : 3.15299E-02 (-0.00864336 0.0116214)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.34 using 59 PHA bins.
# Reduced chi-squared = 1.497 for 57 degrees of freedom
# Null hypothesis probability = 8.900305e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.098e-08 4.239e-09
25- 50 1.480e-07 1.424e-08
50-150 3.846e-07 4.443e-08
15-150 5.636e-07 5.048e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-14.2695 -200)
Norm : 2.37521 (-0.160416 0.160416)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.87 using 59 PHA bins.
# Reduced chi-squared = 1.191 for 57 degrees of freedom
# Null hypothesis probability = 1.535859e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.314e-08 7.227e-09
25- 50 1.599e-07 1.900e-08
50-150 3.508e-07 1.281e-07
15-150 5.938e-07 1.014e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.67239 (-1.92167 2.26841)
R1^2/D10^2 : 0.243670 (-0.118448 0.283324)
kT2 [keV] : 33.9948 (-7.61885 18.3076)
R2^2/D10^2 : 3.77823E-03 (-0.00271687 0.0052916)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.50 using 59 PHA bins.
# Reduced chi-squared = 0.7910 for 55 degrees of freedom
# Null hypothesis probability = 8.683843e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.802e-08 1.696e-08
25- 50 1.559e-07 4.027e-08
50-150 4.748e-07 2.152e-07
15-150 6.887e-07 2.413e-07
Peak spectrum fit
Power-law model
Time interval is from -0.044 sec. to 0.956 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19743 ( -0.201016 0.198223 )
Norm@50keV : 1.11419E-02 ( -0.00129781 0.00129781 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.10 using 59 PHA bins.
# Reduced chi-squared = 0.9491 for 57 degrees of freedom
# Null hypothesis probability = 5.847220e-01
Photon flux (15-150 keV) in 1 sec: 1.30735 ( -0.156146 0.156457 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13121e-07 ( -1.45905e-08 1.47174e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.044 sec. to 0.956 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.602522 ( -0.974903 0.704979 )
Epeak [keV] : 126.667 ( -49.1677 -126.667 )
Norm@50keV : 2.13023E-02 ( -0.00962457 0.0380381 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.53 using 59 PHA bins.
# Reduced chi-squared = 0.9380 for 56 degrees of freedom
# Null hypothesis probability = 6.070013e-01
Photon flux (15-150 keV) in 1 sec: 1.27547 ( -0.16312 0.16231 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09157e-07 ( -1.59387e-08 1.5826e-08 ) ergs/cm2
Band function
Time interval is from -0.044 sec. to 0.956 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.607333 ( -0.44484 0.717462 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 128.895 ( -38.3822 289.165 )
Norm@50keV : 2.10328E-02 ( -0.00760726 0.0114584 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.53 using 59 PHA bins.
# Reduced chi-squared = 0.9552 for 55 degrees of freedom
# Null hypothesis probability = 5.694256e-01
Photon flux (15-150 keV) in 1 sec: 1.28017 ( ) 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] : 18.4490 (-2.59716 3.17651)
R^2/D10^2 : 7.93139E-02 (-0.0324613 0.0523113)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.90 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 57 degrees of freedom
# Null hypothesis probability = 3.056714e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.361e-09 1.232e-09
25- 50 2.525e-08 4.630e-09
50-150 6.276e-08 1.440e-08
15-150 9.337e-08 1.612e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-34.8282 -200)
Norm : 5.39767 (-0.641146 0.641146)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.68 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 57 degrees of freedom
# Null hypothesis probability = 3.123842e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.344e-08 7.470e-09
25- 50 2.585e-08 1.425e-08
50-150 5.669e-08 3.127e-08
15-150 9.598e-08 5.320e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.60239 (-8.12358 5.35862)
R1^2/D10^2 : 0.374931 (-0.245386 1597.41)
kT2 [keV] : 31.3594 (-14.5807 -31.7954)
R2^2/D10^2 : 1.03461E-02 (-0.00987318 0.0749837)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.34 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.86 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 55 degrees of freedom
# Reduced chi-squared = 0.9612 for 55 degrees of freedom
# Null hypothesis probability = 4.617553e-01
# Null hypothesis probability = 5.566454e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.858e-09 3.147e-09
25- 50 2.290e-08 5.500e-09
50-150 6.732e-08 1.641e-08
15-150 9.908e-08 1.833e-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: 1.20191 ( -0.120308 0.119024 )
Norm@50keV : 4.86950E-03 ( -0.000322747 0.000322725 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.98 using 59 PHA bins.
# Reduced chi-squared = 0.7891 for 57 degrees of freedom
# Null hypothesis probability = 8.754914e-01
Photon flux (15-150 keV) in 14.06 sec: 0.571735 ( -0.0392871 0.0393588 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.94231e-07 ( -5.09502e-08 5.12359e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.963717 ( -0.495008 0.295476 )
Epeak [keV] : 235.665 ( -235.665 -235.665 )
Norm@50keV : 6.30062E-03 ( -0.00167587 0.00427238 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.17 using 59 PHA bins.
# Reduced chi-squared = 0.7888 for 56 degrees of freedom
# Null hypothesis probability = 8.735262e-01
Photon flux (15-150 keV) in 14.06 sec: 0.564791 ( -0.041395 0.041368 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.83114e-07 ( -5.60797e-08 5.55961e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.353390 ( 0.481418 4.63958 )
beta : -1.31307 ( 1.30979 0.190335 )
Epeak [keV] : 74.6105 ( -72.4781 249.11 )
Norm@50keV : 1.51561E-02 ( -0.0161554 271570 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.51 using 59 PHA bins.
# Reduced chi-squared = 0.7911 for 55 degrees of freedom
# Null hypothesis probability = 8.681301e-01
Photon flux (15-150 keV) in 14.06 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) = 1.46e-07
S(50-100 keV) = 2.54e-07
T90 vs. Hardness ratio plot
T90 = 9.82799994945526 sec.
Hardness ratio (energy fluence ratio) = 1.73973
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.73115
Count Ratio (50-100 keV) / (15-25 keV) = 1.48901
Mask shadow pattern
IMX = -4.183390703165987E-02, IMY = -1.088327625007844E-03
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:
-463.743400 -446.932600
-239.143600 -6.288000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9953 -15.6319 0.4 31.2 -174.4 8.1558 30.1 1.0 Sco X-1
254.4385 35.3627 8.0 29.9 67.2 0.6176 1.4 1.5 Her X-1
256.1258 -37.8490 695.5 55.5 -173.2 -0.0132 -0.0 6.6 4U 1700-377
256.4194 -36.4586 40.0 54.4 -174.3 -0.2268 -0.3 2.3 GX 349+2
262.9989 -24.7447 154.6 48.1 171.1 0.0428 0.1 0.6 GX 1+4
268.3772 -1.5084 7.9 38.5 139.0 0.7886 1.5 3.4 SW J1753.5-0127
270.2649 -25.1024 4.0 53.0 165.4 -3.1151 -2.9 1.7 GX 5-1
270.2267 -25.8184 6.1 53.5 166.1 -2.1343 -1.9 6.1 GRS 1758-258
273.8610 -13.9701 0.0 49.1 151.3 1.1895 1.1 9.3 GX 17+2
263.1579 -33.8883 16.8 55.3 178.4 -0.7232 -0.7 9.0 GX 354-0
254.3176 -15.3003 2.5 35.7 171.4 1.4749 4.7 ------ UNKNOWN
210.3304 -26.7687 2.2 45.2 -122.3 5.0854 5.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-6.288000 7.776000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.7912 -15.5864 31.8 31.1 -174.1 0.0196 0.4 11.3 Sco X-1
254.3468 35.4541 7.3 29.9 67.0 -0.1297 -1.6 8.6 Her X-1
256.0174 -37.8879 6.0 55.5 -173.1 0.3323 1.9 3.0 4U 1700-377
256.4820 -36.4718 3.5 54.4 -174.3 0.5157 3.3 3.7 GX 349+2
263.0229 -24.7714 4.4 48.2 171.1 -0.3271 -2.6 1.7 GX 1+4
268.2703 -1.5773 154.7 38.4 139.1 -0.0081 -0.1 9.5 SW J1753.5-0127
270.2117 -25.1595 5.5 53.0 165.5 0.4761 2.1 6.2 GX 5-1
270.3973 -25.7475 5.6 53.6 165.9 0.4887 2.1 5.1 GRS 1758-258
274.0026 -13.8801 9.5 49.2 151.1 -0.2524 -1.2 9.4 GX 17+2
262.9889 -33.8344 190.6 55.2 178.5 -0.0137 -0.1 0.0 GX 354-0
233.7110 10.9796 0.5 2.4 178.5 1.0836 22.1 ------ UNKNOWN
220.2488 -24.9079 2.5 39.8 -133.2 0.3759 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
44.156600 962.894200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9976 -15.6360 0.3 28.9 171.8 30.8604 43.3 1.1 Sco X-1
254.6226 35.3914 16.0 30.9 49.2 0.7749 0.7 8.6 Her X-1
255.9255 -37.7023 3.9 52.9 172.7 6.9260 3.0 9.0 4U 1700-377
256.3402 -36.4975 30.6 52.0 171.6 0.8549 0.4 6.4 GX 349+2
262.9943 -24.5932 11.9 45.6 156.2 2.0685 1.0 9.2 GX 1+4
268.2445 -1.6281 0.0 36.6 122.8 1.0112 0.7 12.9 SW J1753.5-0127
270.2158 -25.2733 8.1 50.8 150.7 4.8093 1.4 12.2 GX 5-1
270.3410 -25.7491 4.2 51.2 151.1 9.0052 2.7 2.1 GRS 1758-258
274.1202 -13.8402 6.0 47.1 135.5 6.0908 1.9 13.5 GX 17+2
262.9833 -33.8447 175.3 52.8 164.0 -0.1914 -0.1 0.7 GX 354-0
267.4860 42.0613 3.1 42.8 52.1 9.1160 3.8 ------ UNKNOWN
254.5026 29.5213 3.0 26.8 57.9 3.7756 3.8 ------ UNKNOWN
237.6819 19.6585 2.8 9.5 37.9 2.7824 4.2 ------ UNKNOWN
216.9867 19.4325 2.2 18.2 -45.7 3.2382 5.3 ------ UNKNOWN
199.1754 41.3649 3.3 42.9 -24.0 3.9738 3.5 ------ UNKNOWN
233.7498 -46.5729 3.5 57.6 -165.3 9.6853 3.3 ------ UNKNOWN
178.8831 48.6962 3.5 58.9 -24.4 19.9616 3.2 ------ UNKNOWN
217.1422 -45.3705 2.9 58.3 -151.7 14.7891 4.0 ------ UNKNOWN
200.5763 -11.9061 3.5 40.1 -109.1 7.4326 3.3 ------ UNKNOWN
211.7776 -40.4966 4.8 55.3 -145.1 10.5874 2.4 ------ UNKNOWN
Plot creation:
Sun Nov 1 14:39:13 EST 2015