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
292.2712 33.9059 0.0248 11.3888 -173.9397 0.0753820 7.784 TRIG_00650617
Foreground time interval of the image:
0.240 1.200 (delta_t = 0.960 [sec])
Background time interval of the image:
-239.952 0.240 (delta_t = 240.192 [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 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 0.240 sec. to 1.200 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01826 ( -0.445039 0.517055 )
Norm@50keV : 3.68008E-03 ( -0.00121558 0.00112565 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.46 using 59 PHA bins.
# Reduced chi-squared = 0.9554 for 57 degrees of freedom
# Null hypothesis probability = 5.709601e-01
Photon flux (15-150 keV) in 0.96 sec: 0.556700 ( -0.125593 0.125596 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.26132e-08 ( -9.42129e-09 9.92352e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.240 sec. to 1.200 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.39905 ( -1.43163 0.17423 )
Epeak [keV] : 147.394 ( )
Norm@50keV : 2.33391E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.07 using 59 PHA bins.
# Reduced chi-squared = 0.9655 for 56 degrees of freedom
# Null hypothesis probability = 5.483001e-01
Photon flux (15-150 keV) in 0.96 sec: 0.556489 ( -0.125521 0.125512 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.25192e-08 ( -9.44957e-09 9.69821e-09 ) ergs/cm2
Band function
Time interval is from 0.240 sec. to 1.200 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98492 ( -4.98492 -4.98492 )
beta : -2.06150 ( -0.686443 0.470125 )
Epeak [keV] : 18.2273 ( -18.2273 71.8904 )
Norm@50keV : 4851.13 ( -1092.48 7.78597e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.31 using 59 PHA bins.
# Reduced chi-squared = 0.9874 for 55 degrees of freedom
# Null hypothesis probability = 5.010653e-01
Photon flux (15-150 keV) in 0.96 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] : 8.64549 (-2.99332 4.23152)
R^2/D10^2 : 0.430129 (-0.327201 1.83965)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.61 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 57 degrees of freedom
# Null hypothesis probability = 2.550859e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.877e-09 3.438e-09
25- 50 1.172e-08 5.745e-09
50-150 3.947e-09 2.756e-09
15-150 2.154e-08 1.312e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 66.9150 (-36.4574 -66.9492)
Norm : 2.76068 (-0.894733 1.60493)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.92 using 59 PHA bins.
# Reduced chi-squared = 0.9810 for 57 degrees of freedom
# Null hypothesis probability = 5.157405e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.765e-09 2.622e-09
25- 50 1.063e-08 4.696e-09
50-150 1.320e-08 9.946e-09
15-150 3.059e-08 1.645e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.35472 (-1.76669 2.90564)
R1^2/D10^2 : 5.46046 (-4.6815 66.007)
kT2 [keV] : 21.0382 (-9.29108 -21.0393)
R2^2/D10^2 : 1.20186E-02 (-0.0119698 0.0857681)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.08 using 59 PHA bins.
# Reduced chi-squared = 0.9833 for 55 degrees of freedom
# Null hypothesis probability = 5.096159e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.054e-09 4.540e-09
25- 50 8.202e-09 4.342e-09
50-150 1.643e-08 1.116e-08
15-150 3.269e-08 1.735e-08
Peak spectrum fit
Power-law model
Time interval is from 0.220 sec. to 1.220 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96165 ( -0.449209 0.52015 )
Norm@50keV : 3.68241E-03 ( -0.00119289 0.0010936 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.13 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 57 degrees of freedom
# Null hypothesis probability = 4.333085e-01
Photon flux (15-150 keV) in 1 sec: 0.542846 ( -0.122912 0.122911 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.39009e-08 ( -9.81423e-09 1.02668e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.220 sec. to 1.220 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95468 ( -0.600287 0.52901 )
Epeak [keV] : 9999.09 ( )
Norm@50keV : 3.69481E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.14 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 56 degrees of freedom
# Null hypothesis probability = 3.966102e-01
Photon flux (15-150 keV) in 1 sec: 0.542615 ( -0.122872 0.122873 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.37654e-08 ( -9.6699e-09 1.01945e-08 ) ergs/cm2
Band function
Time interval is from 0.220 sec. to 1.220 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99490 ( -4.9949 -4.9949 )
beta : -1.99311 ( -0.599365 0.468716 )
Epeak [keV] : 17.6798 ( -17.6798 7.19237 )
Norm@50keV : 5722.82 ( -1294.57 7.1606e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.04 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 55 degrees of freedom
# Null hypothesis probability = 3.640161e-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] : 9.82970 (-4.22486 5.44585)
R^2/D10^2 : 0.253552 (-0.196311 1.93996)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.99 using 59 PHA bins.
# Reduced chi-squared = 1.210 for 57 degrees of freedom
# Null hypothesis probability = 1.325505e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.959e-09 2.778e-09
25- 50 1.203e-08 6.222e-09
50-150 5.974e-09 3.803e-09
15-150 2.297e-08 1.270e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 79.8853 (-45.4332 -79.9546)
Norm : 2.51994 (-0.747934 1.37093)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.73 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 57 degrees of freedom
# Null hypothesis probability = 3.767711e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.538e-09 3.205e-09
25- 50 1.076e-08 4.026e-09
50-150 1.517e-08 1.229e-08
15-150 3.247e-08 1.994e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.02220 (-1.45218 2.03178)
R1^2/D10^2 : 7.57406 (-6.36249 70.3781)
kT2 [keV] : 21.2194 (-8.1196 31.5797)
R2^2/D10^2 : 1.23456E-02 (-0.0115346 0.0583413)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.74 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Null hypothesis probability = 4.101302e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.121e-09 4.576e-09
25- 50 8.004e-09 4.316e-09
50-150 1.820e-08 1.147e-08
15-150 3.432e-08 1.847e-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: 2.01826 ( -0.445039 0.517055 )
Norm@50keV : 3.68008E-03 ( -0.00121558 0.00112565 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.46 using 59 PHA bins.
# Reduced chi-squared = 0.9554 for 57 degrees of freedom
# Null hypothesis probability = 5.709601e-01
Photon flux (15-150 keV) in 0.96 sec: 0.556700 ( -0.125593 0.125596 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.26132e-08 ( -9.42129e-09 9.92352e-09 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.39905 ( -1.43163 0.174232 )
Epeak [keV] : 147.394 ( )
Norm@50keV : 2.33391E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.07 using 59 PHA bins.
# Reduced chi-squared = 0.9655 for 56 degrees of freedom
# Null hypothesis probability = 5.483001e-01
Photon flux (15-150 keV) in 0.96 sec: 0.556489 ( -0.125521 0.125512 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.25192e-08 ( -9.44957e-09 9.69821e-09 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98492 ( -4.98492 -4.98492 )
beta : -2.06150 ( -0.686443 0.470125 )
Epeak [keV] : 18.2273 ( -18.2273 95.3662 )
Norm@50keV : 4851.13 ( -1092.48 7.78597e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.31 using 59 PHA bins.
# Reduced chi-squared = 0.9874 for 55 degrees of freedom
# Null hypothesis probability = 5.010653e-01
Photon flux (15-150 keV) in 0.96 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) = 9.87e-09
S(50-100 keV) = 9.75e-09
T90 vs. Hardness ratio plot
T90 = 0.832000017166138 sec.
Hardness ratio (energy fluence ratio) = 0.987842
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.884803
Count Ratio (50-100 keV) / (15-25 keV) = 0.612209
Mask shadow pattern
IMX = -2.003064599409896E-01, IMY = 2.126625601115743E-02
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:
-239.952000 0.240000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3794 35.3516 7.3 42.0 -160.8 0.4858 1.6 3.9 Her X-1
268.5665 -1.5668 0.0 49.9 144.5 0.7346 0.7 13.7 SW J1753.5-0127
288.9254 11.0331 10.6 27.6 130.3 0.2533 1.1 9.1 GRS 1915+105
299.5951 35.1990 0.4 5.4 -161.9 5.0082 26.0 0.3 Cyg X-1
308.1174 40.9593 0.8 7.3 -75.4 2.3934 14.0 0.5 Cyg X-3
326.1711 38.3207 22.4 16.9 -19.3 0.0976 0.5 0.1 Cyg X-2
350.9669 20.4716 2.7 41.8 8.7 1.2571 4.2 ------ UNKNOWN
286.7703 25.5346 2.9 18.6 160.5 0.7340 4.0 ------ UNKNOWN
13.0748 50.9553 2.7 50.5 -39.3 3.4248 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.240000 1.200000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3808 35.2409 4.1 42.1 -161.0 -0.0438 -2.8 7.2 Her X-1
268.4225 -1.4427 35.9 49.9 144.8 -0.0181 -0.3 3.3 SW J1753.5-0127
288.7835 10.8360 4.7 27.9 130.3 -0.0326 -2.4 6.6 GRS 1915+105
299.5878 35.3413 667.5 5.5 -160.5 0.0002 0.0 8.4 Cyg X-1
307.9153 40.8459 6.9 7.2 -76.4 0.0154 1.7 10.9 Cyg X-3
326.3286 38.1511 0.0 17.0 -18.6 0.0093 1.0 12.6 Cyg X-2
292.2713 33.9059 1.5 11.4 -173.9 0.0754 7.8 ------ UNKNOWN
2.9587 29.4664 2.6 48.1 -9.3 0.0811 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
53.948590 962.101700
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4879 35.5537 0.0 30.9 -148.2 0.1678 0.3 12.8 Her X-1
268.2710 -1.3509 4.5 41.9 145.4 3.7626 2.5 8.4 SW J1753.5-0127
288.9653 10.9108 5.2 23.2 116.2 1.4399 2.2 10.1 GRS 1915+105
299.5989 35.1961 0.3 6.1 3.7 19.1278 38.7 0.5 Cyg X-1
308.1252 40.9347 0.7 14.4 -16.0 9.7508 17.2 1.3 Cyg X-3
326.1144 38.4246 4.8 27.5 -1.4 1.3434 2.4 6.7 Cyg X-2
323.5758 13.2799 2.7 35.1 46.3 3.8765 4.2 ------ UNKNOWN
252.2547 -1.4847 2.8 51.6 163.0 9.0978 4.2 ------ UNKNOWN
289.3801 23.2356 3.3 11.0 122.1 1.7998 3.5 ------ UNKNOWN
260.3519 25.5745 2.7 28.8 -170.3 2.3398 4.2 ------ UNKNOWN
338.1437 50.0677 3.1 37.0 -22.2 2.6185 3.7 ------ UNKNOWN
313.6700 54.6779 2.8 25.6 -42.9 2.3484 4.1 ------ UNKNOWN
231.5749 15.0234 4.7 57.6 -165.4 6.8582 2.4 ------ UNKNOWN
256.9583 48.4477 2.8 29.9 -122.4 2.9166 4.1 ------ UNKNOWN
Plot creation:
Sun Aug 30 19:05:12 EDT 2015