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
291.3452 -15.4375 0.0163 26.5224 148.2921 1.0188307 11.747 TRIG_00651882
Foreground time interval of the image:
1.508 39.184 (delta_t = 37.676 [sec])
Background time interval of the image:
-657.799 -641.960 (delta_t = 15.839 [sec])
-239.000 1.508 (delta_t = 240.508 [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 64.000000
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 64.000000
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 64.000000
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 1.508 sec. to 39.184 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13329 ( -0.254418 0.276406 )
Norm@50keV : 1.37258E-03 ( -0.000251992 0.000243695 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.32 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 57 degrees of freedom
# Null hypothesis probability = 2.357457e-01
Photon flux (15-150 keV) in 37.68 sec: 0.219559 ( -0.0287841 0.02879 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.82191e-07 ( -7.67466e-08 7.89814e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.508 sec. to 39.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98355 ( )
Epeak [keV] : 4.52148 ( )
Norm@50keV : 1.67995E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.26 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 56 degrees of freedom
# Null hypothesis probability = 2.095892e-01
Photon flux (15-150 keV) in 37.68 sec: 0.218521 ( -0.029409 0.029454 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.75823e-07 ( -8.78095e-08 8.39586e-08 ) ergs/cm2
Band function
Time interval is from 1.508 sec. to 39.184 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.97514 ( -2.22132 1.9754 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 6.93067 ( -6.90094 -6.90094 )
Norm@50keV : 1.68352E-03 ( -0.000287201 0.000482965 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.27 using 59 PHA bins.
# Reduced chi-squared = 1.169 for 55 degrees of freedom
# Null hypothesis probability = 1.836970e-01
Photon flux (15-150 keV) in 37.68 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] : 8.73113 (-1.4317 1.72105)
R^2/D10^2 : 0.166131 (-0.0839599 0.172633)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.50 using 59 PHA bins.
# Reduced chi-squared = 1.412 for 57 degrees of freedom
# Null hypothesis probability = 2.189662e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.139e-08 2.042e-08
25- 50 1.851e-07 3.749e-08
50-150 6.431e-08 2.636e-08
15-150 3.408e-07 6.686e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 54.5316 (-17.9669 31.8453)
Norm : 1.19381 (-0.259894 0.347057)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.50 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 57 degrees of freedom
# Null hypothesis probability = 2.056499e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.111e-07 2.144e-08
25- 50 1.640e-07 5.661e-08
50-150 1.719e-07 1.141e-07
15-150 4.471e-07 1.817e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.98367 (-1.53134 1.83926)
R1^2/D10^2 : 1.17397 (-0.819805 4.45611)
kT2 [keV] : 18.7316 (-6.15618 14.2812)
R2^2/D10^2 : 6.14934E-03 (-0.0053875 0.013734)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.15 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 55 degrees of freedom
# Null hypothesis probability = 1.864015e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.222e-07 6.846e-08
25- 50 1.453e-07 7.593e-08
50-150 1.994e-07 1.190e-07
15-150 4.669e-07 2.343e-07
Peak spectrum fit
Power-law model
Time interval is from 5.008 sec. to 6.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.26352 ( -0.541795 0.656778 )
Norm@50keV : 3.52993E-03 ( -0.00154539 0.00150508 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.78 using 59 PHA bins.
# Reduced chi-squared = 1.224 for 57 degrees of freedom
# Null hypothesis probability = 1.191376e-01
Photon flux (15-150 keV) in 1 sec: 0.604616 ( -0.175234 0.17528 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.35175e-08 ( -1.1816e-08 1.28338e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.008 sec. to 6.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09010 ( -4.25356 0.996487 )
Epeak [keV] : 26.2576 ( )
Norm@50keV : 2.07547E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.43 using 59 PHA bins.
# Reduced chi-squared = 1.240 for 56 degrees of freedom
# Null hypothesis probability = 1.072428e-01
Photon flux (15-150 keV) in 1 sec: 0.586600 ( -0.174007 0.180503 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91061e-08 ( -1.06412e-08 8.189e-09 ) ergs/cm2
Band function
Time interval is from 5.008 sec. to 6.008 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -2.55501 ( -1.22144 0.69292 )
Epeak [keV] : 20.9122 ( -20.9101 6.79999 )
Norm@50keV : 2593.17 ( -734.838 1.05828e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.35 using 59 PHA bins.
# Reduced chi-squared = 1.243 for 55 degrees of freedom
# Null hypothesis probability = 1.065740e-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] : 7.80992 (-2.37863 2.99734)
R^2/D10^2 : 0.746385 (-0.745064 2.51265)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.74 using 59 PHA bins.
# Reduced chi-squared = 1.241 for 57 degrees of freedom
# Null hypothesis probability = 1.043415e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.082e-09 4.889e-09
25- 50 1.356e-08 8.795e-09
50-150 3.288e-09 2.745e-09
15-150 2.493e-08 1.527e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 38.3602 (-19.5783 64.3814)
Norm : 4.05856 (-1.78339 3.66356)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.43 using 59 PHA bins.
# Reduced chi-squared = 1.218 for 57 degrees of freedom
# Null hypothesis probability = 1.249358e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.185e-09 4.238e-09
25- 50 1.186e-08 6.045e-09
50-150 8.762e-09 6.845e-09
15-150 2.981e-08 1.773e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.05225 (-4.05588 -4.05588)
R1^2/D10^2 : 6.29934 (-6.26883 -6.26883)
kT2 [keV] : 11.1781 (-11.1857 -11.1857)
R2^2/D10^2 : 0.127075 (-0.12662 1.68229)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.10 using 59 PHA bins.
# Reduced chi-squared = 1.256 for 55 degrees of freedom
# Null hypothesis probability = 9.565188e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.426e-09 4.787e-09
25- 50 1.189e-08 6.430e-09
50-150 6.892e-09 4.535e-09
15-150 2.821e-08 1.502e-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: 2.13329 ( -0.254418 0.276406 )
Norm@50keV : 1.37258E-03 ( -0.000251992 0.000243695 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.32 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 57 degrees of freedom
# Null hypothesis probability = 2.357457e-01
Photon flux (15-150 keV) in 37.68 sec: 0.219559 ( -0.0287841 0.02879 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.82191e-07 ( -7.67466e-08 7.89814e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94611 ( -1.01477 0.0949504 )
Epeak [keV] : 12.0436 ( -10.0843 -10.4435 )
Norm@50keV : 1.76274E-03 ( -0.000521496 0.00529939 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.28 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 56 degrees of freedom
# Null hypothesis probability = 2.093377e-01
Photon flux (15-150 keV) in 37.68 sec: 0.218521 ( -0.029409 0.029454 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.75823e-07 ( -8.78095e-08 8.39586e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.97514 ( -3.90681 1.9754 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 6.93067 ( -6.90094 -6.90094 )
Norm@50keV : 1.68352E-03 ( -0.000287201 0.000482965 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.27 using 59 PHA bins.
# Reduced chi-squared = 1.169 for 55 degrees of freedom
# Null hypothesis probability = 1.836970e-01
Photon flux (15-150 keV) in 37.68 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) = 1.50e-07
S(50-100 keV) = 1.37e-07
T90 vs. Hardness ratio plot
T90 = 31.5199999213219 sec.
Hardness ratio (energy fluence ratio) = 0.913333
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.8776
Count Ratio (50-100 keV) / (15-25 keV) = 0.444374
Mask shadow pattern
IMX = -4.245781518859776E-01, IMY = -2.623057113130498E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
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:
-657.799400 -641.960400
-239.000000 1.508000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9992 -15.6510 0.8 50.8 -146.9 9.5036 13.9 1.3 Sco X-1
254.5157 35.4567 5.7 39.5 -72.2 1.3814 2.0 7.4 Her X-1
255.9517 -37.7334 45.4 57.6 -175.6 -0.3224 -0.3 6.8 4U 1700-377
256.3361 -36.4331 7.0 56.4 -174.9 1.6671 1.6 4.8 GX 349+2
262.9965 -24.7174 17.1 43.6 -171.2 -0.2704 -0.7 1.8 GX 1+4
268.5477 -1.3859 6.2 23.6 -146.5 0.4557 1.8 11.5 SW J1753.5-0127
270.1884 -24.9991 17.9 40.3 -179.6 0.2168 0.6 7.1 GX 5-1
270.2972 -25.7354 7.7 40.9 179.7 0.5322 1.5 0.5 GRS 1758-258
274.0012 -14.0690 2.8 29.0 -175.5 1.0405 4.1 2.0 GX 17+2
275.8025 -30.3269 8.8 43.1 170.3 0.5524 1.3 6.8 H1820-303
285.1496 -24.8359 19.3 36.0 159.5 0.2309 0.6 8.0 HT1900.1-2455
288.7380 11.1417 15.1 0.2 -35.5 -0.1596 -0.8 12.3 GRS 1915+105
299.6061 35.1940 0.5 26.2 -5.7 4.9906 21.9 0.9 Cyg X-1
308.1187 40.9487 1.3 34.5 0.1 2.6351 9.1 0.4 Cyg X-3
326.2391 38.4064 56.1 43.2 18.0 -0.0884 -0.2 6.0 Cyg X-2
263.0898 -33.7659 3.4 51.0 -178.5 2.0911 3.4 6.5 GX 354-0
321.2322 60.7343 3.8 55.2 -7.5 2.3562 3.0 ------ UNKNOWN
262.6145 -9.1646 2.3 32.9 -152.9 1.2740 4.9 ------ UNKNOWN
279.0023 44.1678 2.4 34.3 -38.6 1.3946 4.7 ------ UNKNOWN
243.5150 -28.2896 4.2 58.8 -159.1 4.2232 2.8 ------ UNKNOWN
254.0192 24.1111 2.8 35.5 -89.7 2.3269 4.2 ------ UNKNOWN
UNKNOWN
UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
1.508000 39.184000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.8666 -15.6987 4.5 51.0 -146.9 -0.5187 -2.6 7.4 Sco X-1
254.5094 35.3664 4.6 39.5 -72.3 -0.4625 -2.5 2.9 Her X-1
255.9669 -37.7533 5.0 57.6 -175.6 0.9451 2.3 5.5 4U 1700-377
256.3771 -36.4592 7.9 56.4 -175.0 -0.4729 -1.5 3.6 GX 349+2
262.9217 -24.6582 3.6 43.6 -171.1 0.3566 3.2 7.1 GX 1+4
268.3891 -1.4645 18.8 23.8 -146.4 -0.0435 -0.6 1.5 SW J1753.5-0127
270.1323 -25.1134 88.7 40.4 -179.6 0.0135 0.1 8.5 GX 5-1
270.3764 -25.8373 6.7 40.9 179.6 0.1846 1.7 6.9 GRS 1758-258
273.8257 -14.0956 2.8 29.1 -175.2 -0.3120 -4.1 11.1 GX 17+2
275.9144 -30.4012 5.9 43.2 170.1 -0.2540 -1.9 2.1 H1820-303
285.1486 -24.9936 6.3 36.1 159.4 -0.2045 -1.8 7.5 HT1900.1-2455
288.8297 10.7634 6.0 0.2 136.9 -0.1205 -1.9 11.1 GRS 1915+105
299.5573 35.2354 465.7 26.2 -5.9 0.0018 0.0 2.6 Cyg X-1
308.2117 40.8769 6.9 34.5 0.3 -0.1358 -1.7 6.5 Cyg X-3
326.2145 38.4018 5.4 43.2 18.0 -0.2781 -2.1 5.2 Cyg X-2
263.0281 -33.9642 11.4 51.2 -178.6 0.1855 1.0 8.0 GX 354-0
303.4457 -32.0951 2.6 45.3 136.3 1.2407 4.5 ------ UNKNOWN
291.3452 -15.4376 1.0 26.5 148.3 1.0188 11.7 ------ UNKNOWN
271.1877 51.9901 2.4 43.4 -41.8 0.6550 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
127.900600 963.029200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.8812 -37.7257 17.9 38.4 -136.0 -0.7941 -0.6 8.7 4U 1700-377
256.4468 -36.2771 7.8 37.4 -134.2 1.7370 1.5 8.8 GX 349+2
263.1924 -24.6528 0.0 28.0 -117.4 -2.6238 -2.6 11.4 GX 1+4
264.8536 -44.4751 56.9 36.7 -151.4 -0.1885 -0.2 5.0 4U 1735-44
268.3433 -1.4557 26.4 26.7 -64.2 0.3999 0.4 1.5 SW J1753.5-0127
270.1927 -25.0520 3.9 22.0 -122.9 2.1989 3.0 5.2 GX 5-1
270.3452 -25.7400 2.7 22.2 -124.8 3.1398 4.2 2.3 GRS 1758-258
273.9912 -13.9876 2.2 16.9 -91.0 3.6413 5.2 3.1 GX 17+2
275.9446 -30.3562 1.9 20.6 -142.9 4.3527 6.2 1.2 H1820-303
285.1664 -24.9456 4.3 11.2 -153.3 1.8312 2.7 7.3 HT1900.1-2455
288.8840 10.9689 8.7 26.5 -9.1 0.9762 1.3 5.2 GRS 1915+105
299.5912 35.2151 1.4 51.2 5.0 14.5869 8.2 0.8 Cyg X-1
263.0091 -33.8820 4.3 31.5 -134.7 2.3961 2.7 3.0 GX 354-0
329.5509 -42.2013 3.1 42.3 133.5 9.7188 3.8 ------ UNKNOWN
301.0617 -21.4815 2.9 11.0 121.2 2.9696 4.0 ------ UNKNOWN
289.6131 -69.4596 5.0 54.1 177.1 7.4143 2.3 ------ UNKNOWN
287.2265 39.6041 3.4 55.2 -7.5 7.7025 3.4 ------ UNKNOWN
263.1813 6.9679 2.4 35.8 -56.9 5.1447 4.7 ------ UNKNOWN
Plot creation:
Sun Aug 30 19:01:26 EDT 2015