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
249.6341 -12.0520 0.0041 21.6837 -102.9729 3.8790332 46.937 TRIG_00652334
Foreground time interval of the image:
-16.764 10.117 (delta_t = 26.881 [sec])
Background time interval of the image:
-154.283 -16.764 (delta_t = 137.519 [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)
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 -16.764 sec. to 58.732 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77457 ( -0.0442923 0.0443759 )
Norm@50keV : 8.54140E-03 ( -0.000192276 0.000192213 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.67 using 59 PHA bins.
# Reduced chi-squared = 0.8363 for 57 degrees of freedom
# Null hypothesis probability = 8.059732e-01
Photon flux (15-150 keV) in 75.5 sec: 1.16558 ( -0.0306459 0.030792 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.94294e-06 ( -1.35764e-07 1.35851e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -16.764 sec. to 58.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60532 ( -0.180304 0.172488 )
Epeak [keV] : 123.185 ( -37.7862 7881.65 )
Norm@50keV : 1.02600E-02 ( -0.00161331 0.00215252 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.90 using 59 PHA bins.
# Reduced chi-squared = 0.8018 for 56 degrees of freedom
# Null hypothesis probability = 8.561870e-01
Photon flux (15-150 keV) in 75.5 sec: 1.14770 ( -0.03512 0.03535 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.86528e-06 ( -1.58678e-07 1.57818e-07 ) ergs/cm2
Band function
Time interval is from -16.764 sec. to 58.732 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.945401 ( -0.676917 4.57381 )
beta : -1.85382 ( -0.0844292 0.070623 )
Epeak [keV] : 46.7790 ( -17.2973 30.9108 )
Norm@50keV : 2.62564E-02 ( -0.0366678 50.7832 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.27 using 59 PHA bins.
# Reduced chi-squared = 0.7141 for 55 degrees of freedom
# Null hypothesis probability = 9.459796e-01
Photon flux (15-150 keV) in 75.5 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.8061e-06 ( -5.80557e-06 -1.54277e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.2739 ( )
R^2/D10^2 : 0.138270 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 480.39 using 59 PHA bins.
# Reduced chi-squared = 8.4280 for 57 degrees of freedom
# Null hypothesis probability = 2.775160e-68
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.484e-07 2.261e-08
25- 50 1.700e-06 4.945e-08
50-150 2.303e-06 9.815e-08
15-150 4.451e-06 1.114e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 123.714 (-10.6047 16.5214)
Norm : 4.81658 (-0.182986 0.157508)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.75 using 59 PHA bins.
# Reduced chi-squared = 0.9255 for 57 degrees of freedom
# Null hypothesis probability = 6.350560e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.018e-07 4.832e-08
25- 50 1.643e-06 7.097e-08
50-150 3.091e-06 6.670e-07
15-150 5.636e-06 7.146e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.67387 (-0.555081 0.573768)
R1^2/D10^2 : 0.985445 (-0.216956 0.299935)
kT2 [keV] : 28.1059 (-2.62464 3.37919)
R2^2/D10^2 : 8.66803E-03 (-0.00290509 0.00384887)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.35 using 59 PHA bins.
# Reduced chi-squared = 0.8609 for 55 degrees of freedom
# Null hypothesis probability = 7.587025e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.509e-07 6.568e-08
25- 50 1.751e-06 7.550e-08
50-150 3.165e-06 2.295e-07
15-150 5.767e-06 2.805e-07
Peak spectrum fit
Power-law model
Time interval is from 11.216 sec. to 12.216 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.940054 ( -0.0617734 0.0613719 )
Norm@50keV : 8.36366E-02 ( -0.00287942 0.00287159 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.29 using 59 PHA bins.
# Reduced chi-squared = 0.7595 for 57 degrees of freedom
# Null hypothesis probability = 9.099384e-01
Photon flux (15-150 keV) in 1 sec: 9.60625 ( -0.333529 0.333864 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.24393e-07 ( -3.42279e-08 3.42813e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.216 sec. to 12.216 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.848700 ( -0.24112 0.116755 )
Epeak [keV] : 758.909 ( -758.909 -758.909 )
Norm@50keV : 9.14667E-02 ( -0.013109 0.0235463 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.84 using 59 PHA bins.
# Reduced chi-squared = 0.7650 for 56 degrees of freedom
# Null hypothesis probability = 9.019059e-01
Photon flux (15-150 keV) in 1 sec: 9.56827 ( -0.3459 0.34132 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.2187e-07 ( -3.5311e-08 3.4614e-08 ) ergs/cm2
Band function
Time interval is from 11.216 sec. to 12.216 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.814341 ( 0.814341 0.814341 )
beta : -0.940056 ( -0.0613672 0.0617819 )
Epeak [keV] : 40.5491 ( )
Norm@50keV : 0.129107 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.29 using 59 PHA bins.
# Reduced chi-squared = 0.7871 for 55 degrees of freedom
# Null hypothesis probability = 8.733360e-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] : 23.9022 ( )
R^2/D10^2 : 0.269627 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 188.07 using 59 PHA bins.
# Reduced chi-squared = 3.2995 for 57 degrees of freedom
# Null hypothesis probability = 6.534956e-16
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.739e-08 1.670e-09
25- 50 1.518e-07 8.300e-09
50-150 6.463e-07 3.675e-08
15-150 8.254e-07 3.345e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 38.7549 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 309.59 using 59 PHA bins.
# Reduced chi-squared = 5.4314 for 57 degrees of freedom
# Null hypothesis probability = 2.077955e-36
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.650e-08 3.395e-09
25- 50 1.856e-07 6.900e-09
50-150 4.071e-07 1.650e-08
15-150 6.893e-07 2.475e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.68489 (-1.30638 1.50152)
R1^2/D10^2 : 3.26704 (-1.20863 2.17152)
kT2 [keV] : 38.3989 (-4.70013 7.25625)
R2^2/D10^2 : 5.61712E-02 (-0.0224639 0.0279441)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.93 using 59 PHA bins.
# Reduced chi-squared = 0.7806 for 55 degrees of freedom
# Null hypothesis probability = 8.815644e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.805e-08 9.645e-09
25- 50 1.686e-07 1.680e-08
50-150 7.054e-07 7.215e-08
15-150 9.321e-07 9.190e-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: 1.80336 ( -0.0655011 0.0659459 )
Norm@50keV : 8.71965E-03 ( -0.0003089 0.000308037 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.74 using 59 PHA bins.
# Reduced chi-squared = 0.6972 for 57 degrees of freedom
# Null hypothesis probability = 9.601279e-01
Photon flux (15-150 keV) in 26.88 sec: 1.20312 ( -0.0445343 0.0446894 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.1575e-06 ( -7.77579e-08 7.79571e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55951 ( -0.263107 0.248138 )
Epeak [keV] : 89.8040 ( -23.7598 1914.66 )
Norm@50keV : 1.15395E-02 ( -0.00278134 0.00396021 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.92 using 59 PHA bins.
# Reduced chi-squared = 0.6593 for 56 degrees of freedom
# Null hypothesis probability = 9.770495e-01
Photon flux (15-150 keV) in 26.88 sec: 1.18150 ( -0.04917 0.04934 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11367e-06 ( -8.99889e-08 8.97684e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.746304 ( -3.97119 -1.48257 )
beta : -1.87727 ( -0.0948742 0.0858153 )
Epeak [keV] : 29.7599 ( -5.37888 34.637 )
Norm@50keV : 0.535427 ( -0.532113 466.474 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.02 using 59 PHA bins.
# Reduced chi-squared = 0.6186 for 55 degrees of freedom
# Null hypothesis probability = 9.882883e-01
Photon flux (15-150 keV) in 26.88 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10996e-06 ( -2.10977e-06 -8.43306e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.66e-06
S(50-100 keV) = 1.94e-06
T90 vs. Hardness ratio plot
T90 = 37.9959999322891 sec.
Hardness ratio (energy fluence ratio) = 1.16867
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.21295
Count Ratio (50-100 keV) / (15-25 keV) = 0.748051
Mask shadow pattern
IMX = -8.926171229124183E-02, IMY = 3.874711303892153E-01
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:
-154.283420 -16.764000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9887 -15.6387 0.5 26.9 -109.2 4.7844 23.7 0.5 Sco X-1
254.3189 35.2642 5.1 45.7 -18.7 0.5862 2.3 8.3 Her X-1
255.8897 -37.8533 9.7 33.3 -157.1 -0.1983 -1.2 4.6 4U 1700-377
256.5807 -36.5831 21.5 31.9 -156.8 -0.0835 -0.5 11.9 GX 349+2
262.8521 -24.6395 3.0 18.8 -155.3 0.5662 3.9 10.7 GX 1+4
264.5758 -44.2994 5.5 37.2 -171.5 0.3908 2.1 11.5 4U 1735-44
268.2200 -1.5005 7.8 6.8 -25.4 -0.2160 -1.5 9.3 SW J1753.5-0127
270.2611 -25.0525 7.6 17.5 -176.6 0.2026 1.5 2.0 GX 5-1
270.2517 -25.7882 3.1 18.2 -176.7 0.5048 3.7 3.9 GRS 1758-258
274.0745 -13.8850 3.4 6.9 156.6 0.4732 3.4 9.9 GX 17+2
275.7609 -30.2244 0.0 23.0 170.5 0.0814 0.6 12.1 H1820-303
284.8719 -24.7900 0.0 21.6 145.0 0.2255 1.4 11.9 HT1900.1-2455
288.8707 10.7989 7.9 25.5 44.6 -0.2657 -1.5 9.8 GRS 1915+105
299.6031 35.2286 1.4 50.5 30.9 5.6309 8.0 1.7 Cyg X-1
263.0544 -33.6892 18.9 27.2 -164.4 0.0886 0.6 9.3 GX 354-0
311.6649 -13.4391 2.8 40.2 102.5 2.3845 4.1 ------ UNKNOWN
287.2203 -16.9859 2.7 18.3 123.1 0.6455 4.2 ------ UNKNOWN
257.5214 -32.2393 2.2 27.7 -153.9 0.7814 5.2 ------ UNKNOWN
245.3017 -16.8055 2.4 26.9 -111.8 0.9605 4.7 ------ UNKNOWN
239.7676 -52.7708 2.9 51.9 -155.7 1.4590 3.9 ------ UNKNOWN
240.5364 44.4981 2.8 58.9 -24.5 4.0225 4.1 ------ UNKNOWN
UNKNOWN
UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-16.764000 10.116600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.8433 -15.6910 10.6 27.0 -109.2 -0.1019 -1.1 8.4 Sco X-1
254.5868 35.2131 0.0 45.6 -18.4 -0.1130 -0.9 10.0 Her X-1
255.8649 -37.7353 16.7 33.2 -156.9 0.0563 0.7 8.7 4U 1700-377
256.3883 -36.5658 5.3 32.0 -156.6 0.1826 2.2 8.9 GX 349+2
263.0883 -24.8876 13.5 19.0 -156.2 0.0604 0.9 9.6 GX 1+4
264.5749 -44.4289 6.3 37.3 -171.6 -0.1667 -1.8 7.3 4U 1735-44
268.5166 -1.3396 6.6 6.8 -22.5 0.1207 1.7 11.2 SW J1753.5-0127
270.2808 -25.0817 184.5 17.5 -176.7 -0.0041 -0.1 0.2 GX 5-1
270.3001 -25.7394 42.3 18.2 -176.8 0.0187 0.3 0.3 GRS 1758-258
274.0027 -14.0219 80.6 7.0 157.6 0.0100 0.1 0.9 GX 17+2
276.0892 -30.5094 0.0 23.4 169.9 -0.2227 -3.1 12.0 H1820-303
284.8719 -24.7900 0.0 21.6 145.0 -0.0727 -0.9 11.9 HT1900.1-2455
288.7793 10.9767 6.7 25.5 44.2 0.1525 1.7 2.2 GRS 1915+105
299.5993 35.2071 5.5 50.5 30.9 -0.7393 -2.1 0.5 Cyg X-1
263.1336 -33.7153 6.3 27.2 -164.6 0.1364 1.8 10.2 GX 354-0
302.3987 32.3958 2.2 49.8 35.6 1.7899 5.3 ------ UNKNOWN
287.7003 -59.4056 2.5 53.3 170.2 1.2315 4.6 ------ UNKNOWN
275.3813 -6.7540 2.0 4.3 79.7 0.3927 5.9 ------ UNKNOWN
249.6341 -12.0520 0.2 21.7 -103.0 3.8789 46.9 ------ UNKNOWN
249.5139 25.3986 2.5 39.1 -31.2 0.4886 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
54.116600 482.746000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9874 -15.6459 0.3 5.8 -139.5 5.6588 35.6 0.6 Sco X-1
254.5441 35.3787 10.9 47.7 -5.3 0.3596 1.1 4.8 Her X-1
255.9092 -37.9137 4.3 26.5 158.2 0.5405 2.7 5.6 4U 1700-377
256.3401 -36.5539 14.1 25.2 156.7 0.1672 0.8 9.1 GX 349+2
262.8578 -24.6616 8.3 17.7 126.5 0.2459 1.4 9.7 GX 1+4
264.7488 -44.4639 3.8 34.9 150.4 0.8849 3.0 0.9 4U 1735-44
268.5006 -1.3309 4.7 21.5 50.9 -0.5033 -2.5 10.8 SW J1753.5-0127
270.3769 -24.9420 25.4 23.4 115.6 0.0971 0.5 9.7 GX 5-1
270.3795 -25.6051 2.9 23.8 117.0 0.8688 4.0 9.3 GRS 1758-258
273.9525 -13.9500 3.0 23.7 86.6 0.8665 3.8 6.0 GX 17+2
275.9513 -30.4779 20.2 30.5 120.6 0.1605 0.6 6.8 H1820-303
285.2002 -24.8991 6.0 35.9 105.4 0.8648 1.9 9.0 HT1900.1-2455
288.7106 10.8432 6.2 45.0 50.3 1.4793 1.9 8.0 GRS 1915+105
262.8682 -33.9744 5.5 25.0 142.7 0.4129 2.1 10.3 GX 354-0
258.9794 -6.9535 3.0 10.5 51.1 0.6551 3.9 ------ UNKNOWN
265.4887 42.3615 2.1 56.3 3.3 5.2752 5.5 ------ UNKNOWN
255.2782 4.7070 2.6 17.7 8.0 0.7373 4.5 ------ UNKNOWN
203.4539 -23.6562 2.5 45.3 -122.1 3.7889 4.6 ------ UNKNOWN
201.2586 -29.0658 3.9 48.0 -129.1 2.5263 3.0 ------ UNKNOWN
203.2723 -23.1508 3.7 45.4 -121.4 2.5314 3.1 ------ UNKNOWN
Plot creation:
Thu Oct 1 11:39:44 EDT 2015