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
279.525 33.858 0.000 30.683 -35.567 0.277 7.513 TRIG_00294120
Image time interval: 0.000 to 16.384 [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 16.384000
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 16.384000
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 16.384000
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 3.600 sec. to 81.552 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60675 ( -0.500654 0.516572 )
Norm@50keV : 5.42055E-04 ( -0.000150132 0.000141117 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.28 using 59 PHA bins.
# Reduced chi-squared = 0.7943 for 57 degrees of freedom
# Null hypothesis probability = 8.686642e-01
Photon flux (15-150 keV) in 77.95 sec: 6.98030E-02 ( -0.0172344 0.0172519 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.94835e-07 ( -1.13694e-07 1.171e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.600 sec. to 81.552 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28870 ( )
Epeak [keV] : 104.674 ( )
Norm@50keV : 2.29241E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.81 using 59 PHA bins.
# Reduced chi-squared = 0.7823 for 56 degrees of freedom
# Null hypothesis probability = 8.817694e-01
Photon flux (15-150 keV) in 77.95 sec: 6.99008E-02 ( -0.0170019 0.0171348 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.91173e-07 ( -1.10052e-07 1.2094e-07 ) ergs/cm2
Band function
Time interval is from 3.600 sec. to 81.552 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.28552 ( 1.2864 1.2864 )
beta : -1.60673 ( 1.60685 0.500634 )
Epeak [keV] : 26.4335 ( -26.0802 -26.0802 )
Norm@50keV : 1.18572E-03 ( -0.00118719 0.0205921 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.28 using 59 PHA bins.
# Reduced chi-squared = 0.8232 for 55 degrees of freedom
# Null hypothesis probability = 8.221121e-01
Photon flux (15-150 keV) in 77.95 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] : 10.8663 (-3.2663 6.11397)
R^2/D10^2 : 2.29439E-02 (-0.018319 0.0643206)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.09 using 59 PHA bins.
# Reduced chi-squared = 0.9489 for 57 degrees of freedom
# Null hypothesis probability = 5.849806e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.401e-08 2.731e-08
25- 50 1.225e-07 7.129e-08
50-150 8.093e-08 5.874e-08
15-150 2.474e-07 1.516e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 0.279310 (-0.068612 0.102572)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.34 using 59 PHA bins.
# Reduced chi-squared = 0.8130 for 57 degrees of freedom
# Null hypothesis probability = 8.425291e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.422e-08 3.253e-08
25- 50 1.043e-07 6.236e-08
50-150 2.287e-07 1.354e-07
15-150 3.872e-07 2.343e-07
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.42 using 59 PHA bins.
#Fit statistic : Chi-Squared = 42.33 using 59 PHA bins.
#Fit statistic : Chi-Squared = 42.30 using 59 PHA bins.
#Fit statistic : Chi-Squared = 42.28 using 59 PHA bins.
# Reduced chi-squared = 0.7713 for 55 degrees of freedom
# Reduced chi-squared = 0.7697 for 55 degrees of freedom
# Reduced chi-squared = 0.7691 for 55 degrees of freedom
# Reduced chi-squared = 0.7688 for 55 degrees of freedom
# Null hypothesis probability = 8.925246e-01
# Null hypothesis probability = 8.944702e-01
# Null hypothesis probability = 8.951034e-01
# Null hypothesis probability = 8.954230e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.135e-08 3.657e-08
25- 50 1.020e-07 5.901e-08
50-150 2.931e-07 1.631e-07
15-150 4.564e-07 2.192e-07
Peak spectrum fit
Power-law model
Time interval is from 3.644 sec. to 4.644 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92433 ( -0.990105 1.1767 )
Norm@50keV : 2.49549E-03 ( -0.00249375 0.00131916 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.90 using 59 PHA bins.
# Reduced chi-squared = 0.9632 for 57 degrees of freedom
# Null hypothesis probability = 5.541346e-01
Photon flux (15-150 keV) in 1 sec: 0.361891 ( -0.149365 0.149374 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29347e-08 ( -2.2934e-08 1.32922e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.644 sec. to 4.644 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.30027 ( )
Epeak [keV] : 360.103 ( )
Norm@50keV : 5.37392E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.01 using 59 PHA bins.
# Reduced chi-squared = 0.9645 for 56 degrees of freedom
# Null hypothesis probability = 5.505371e-01
Photon flux (15-150 keV) in 1 sec: 0.361034 ( -0.14924 0.149468 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.225e-08 ( -1.13367e-08 1.39992e-08 ) ergs/cm2
Band function
Time interval is from 3.644 sec. to 4.644 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99493 ( -4.99493 -4.99493 )
beta : -2.03332 ( -5.19188 1.06584 )
Epeak [keV] : 19.6625 ( -19.6625 71.3653 )
Norm@50keV : 1889.48 ( -776.345 8.71987e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.77 using 59 PHA bins.
# Reduced chi-squared = 0.9958 for 55 degrees of freedom
# Null hypothesis probability = 4.834862e-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] : 5.81007 (-2.23807 5.48884)
R^2/D10^2 : 1.37039 (-1.37008 10.9082)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.49 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.567788e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.860e-09 3.792e-09
25- 50 5.445e-09 3.803e-09
50-150 4.362e-10 4.030e-10
15-150 1.174e-08 7.865e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9709 (-99.9913 -99.9913)
Norm : 1.54605 (-0.740543 5.21121)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.92 using 59 PHA bins.
# Reduced chi-squared = 0.9810 for 57 degrees of freedom
# Null hypothesis probability = 5.157548e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.041e-09 2.685e-09
25- 50 6.987e-09 4.567e-09
50-150 1.132e-08 9.200e-09
15-150 2.235e-08 1.566e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.19154 (-2.03817 3.07069)
R1^2/D10^2 : 2.08648 (-1.83538 19.4251)
kT2 [keV] : 198.276 (-198.25 -198.25)
R2^2/D10^2 : 7.13224E-05 (-4.72909e-05 0.00734963)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.50 using 59 PHA bins.
# Reduced chi-squared = 0.9364 for 55 degrees of freedom
# Null hypothesis probability = 6.091021e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.975e-09 3.775e-09
25- 50 4.982e-09 2.852e-09
50-150 1.895e-08 2.454e-09
15-150 2.991e-08 8.940e-09
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: 1.60675 ( -0.500654 0.516572 )
Norm@50keV : 5.42055E-04 ( -0.000150132 0.000141117 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.28 using 59 PHA bins.
# Reduced chi-squared = 0.7943 for 57 degrees of freedom
# Null hypothesis probability = 8.686642e-01
Photon flux (15-150 keV) in 77.95 sec: 6.98030E-02 ( -0.0172344 0.0172519 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.94835e-07 ( -1.13694e-07 1.171e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.92805 ( -1.63489 0.269239 )
Epeak [keV] : 277.485 ( )
Norm@50keV : 1.20707E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.42 using 59 PHA bins.
# Reduced chi-squared = 0.7754 for 56 degrees of freedom
# Null hypothesis probability = 8.901156e-01
Photon flux (15-150 keV) in 77.95 sec: 6.99008E-02 ( -0.0170019 0.0171348 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.91173e-07 ( -1.10052e-07 1.2094e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.28552 ( 1.2864 1.2864 )
beta : -1.60673 ( 1.60685 0.500634 )
Epeak [keV] : 26.4335 ( -26.0802 -26.0802 )
Norm@50keV : 1.18572E-03 ( -0.00118719 0.0232208 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.28 using 59 PHA bins.
# Reduced chi-squared = 0.8232 for 55 degrees of freedom
# Null hypothesis probability = 8.221121e-01
Photon flux (15-150 keV) in 77.95 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) = 1.03e-07
S(50-100 keV) = 1.35e-07
T90 vs. Hardness ratio plot
T90 = 75.5840000212193 sec.
Hardness ratio (energy fluence ratio) = 1.31068
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.907524
Count Ratio (50-100 keV) / (15-25 keV) = 0.422996
Mask shadow pattern
IMX = 0.482663359722, IMY = 0.345128921831
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
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:
-239.344000 -96.030100
-95.344000 3.600000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
268.4657 -1.3245 6.5 35.3 -105.7 0.7148 1.8 9.7 SW J1753.5-0127
270.4310 -25.1110 43.0 47.2 -137.6 -0.1607 -0.3 8.2 GX 5-1
270.4299 -25.6691 10.6 47.6 -138.1 -0.6837 -1.1 8.2 GRS 1758-258
273.9092 -14.0722 6.1 37.2 -129.0 0.6223 1.9 6.0 GX 17+2
276.0511 -30.3061 9.0 48.1 -147.3 -0.5879 -1.3 7.5 H1820-303
285.0240 -24.9182 6.3 39.4 -153.2 0.5611 1.8 0.7 HT1900.1-2455
288.7747 10.9527 0.8 12.8 -86.0 2.6277 14.6 1.5 GRS 1915+105
299.5914 35.2070 0.3 24.4 -1.9 8.7636 45.4 0.3 Cyg X-1
308.1467 40.9538 1.3 30.6 12.0 1.7861 8.7 1.7 Cyg X-3
326.2398 38.3951 3.1 35.1 36.8 1.0844 3.8 5.4 Cyg X-2
308.0571 37.6600 1.2 27.4 13.3 1.9402 9.8 ------ UNKNOWN
293.4093 -47.2584 2.8 58.6 -170.9 4.6168 4.1 ------ UNKNOWN
284.2330 34.1155 2.6 28.2 -29.4 0.8684 4.5 ------ UNKNOWN
265.4020 -22.1502 2.1 48.6 -130.5 4.4814 5.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
3.600000 81.552000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
268.4966 -1.3234 9.0 35.3 -105.7 -0.2358 -1.3 10.9 SW J1753.5-0127
270.4323 -25.1182 10.6 47.2 -137.6 0.2966 1.1 8.4 GX 5-1
270.4413 -25.7319 13.2 47.7 -138.2 0.2377 0.9 7.5 GRS 1758-258
274.0057 -14.0377 926.5 37.2 -129.0 -0.0020 -0.0 0.1 GX 17+2
275.7784 -30.3160 4.8 48.2 -147.0 0.5831 2.4 8.2 H1820-303
285.1127 -24.9051 8.7 39.3 -153.3 -0.1883 -1.3 4.3 HT1900.1-2455
288.7048 11.0025 2.8 12.8 -85.8 -0.3979 -4.1 6.5 GRS 1915+105
299.4199 35.2446 5.5 24.4 -2.2 0.2067 2.1 8.7 Cyg X-1
307.9645 41.0738 3.5 30.7 11.6 0.3573 3.3 9.8 Cyg X-3
326.0389 38.2319 6.6 34.9 36.8 0.2741 1.7 8.3 Cyg X-2
322.6710 52.4923 2.0 44.9 20.4 1.2244 5.7 ------ UNKNOWN
311.6680 -28.4887 2.4 40.5 169.1 0.7401 4.9 ------ UNKNOWN
311.0242 -21.7267 2.9 33.9 166.9 0.5059 3.9 ------ UNKNOWN
294.2004 67.6614 2.5 57.0 -0.9 2.5605 4.6 ------ UNKNOWN
279.4873 33.8050 1.8 30.7 -35.7 0.6973 6.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
791.556610 962.664100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
326.2040 38.4322 54.3 35.5 -89.7 0.0652 0.2 6.8 Cyg X-2
37.0729 11.6921 2.3 35.2 59.9 1.3140 5.0 ------ UNKNOWN
319.6173 -15.2878 2.5 54.3 -166.1 1.8712 4.6 ------ UNKNOWN
Plot creation:
Thu Oct 8 20:36:10 EDT 2015