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
218.272 -35.197 0.000 23.359 -24.610 0.707 9.022 TRIG_00649916
Image time interval: 0.000 to 64.000 [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 -26.456 sec. to 45.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84257 ( -0.256592 0.270512 )
Norm@50keV : 8.97293E-04 ( -0.000140304 0.000135094 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.02 using 59 PHA bins.
# Reduced chi-squared = 0.8952 for 57 degrees of freedom
# Null hypothesis probability = 6.975636e-01
Photon flux (15-150 keV) in 72.08 sec: 0.125745 ( -0.0165434 0.016579 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.94757e-07 ( -9.14227e-08 9.31994e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -26.456 sec. to 45.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.69553 ( -1.18925 0.284188 )
Epeak [keV] : 227.089 ( )
Norm@50keV : 3.59549E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.91 using 59 PHA bins.
# Reduced chi-squared = 0.8913 for 56 degrees of freedom
# Null hypothesis probability = 7.032501e-01
Photon flux (15-150 keV) in 72.08 sec: 0.126035 ( -0.016789 0.016338 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.96294e-07 ( -9.28189e-08 8.85647e-08 ) ergs/cm2
Band function
Time interval is from -26.456 sec. to 45.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.47427 ( 1.47517 1.47517 )
beta : -1.84237 ( 1.84252 0.256177 )
Epeak [keV] : 17.1346 ( -16.8235 -16.8235 )
Norm@50keV : 2.19284E-03 ( -0.00220014 221492 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.02 using 59 PHA bins.
# Reduced chi-squared = 0.9277 for 55 degrees of freedom
# Null hypothesis probability = 6.272322e-01
Photon flux (15-150 keV) in 72.08 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] : 11.5723 (-2.22598 2.96314)
R^2/D10^2 : 3.21179E-02 (-0.0316883 0.0392229)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.91 using 59 PHA bins.
# Reduced chi-squared = 1.367 for 57 degrees of freedom
# Null hypothesis probability = 3.433340e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.532e-08 1.778e-08
25- 50 1.968e-07 4.505e-08
50-150 1.546e-07 5.150e-08
15-150 4.167e-07 8.815e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 104.251 (-41.9896 -105.006)
Norm : 0.541226 (-0.0884346 0.124595)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.97 using 59 PHA bins.
# Reduced chi-squared = 0.9468 for 57 degrees of freedom
# Null hypothesis probability = 5.895810e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.020e-07 2.000e-08
25- 50 1.777e-07 3.168e-08
50-150 2.948e-07 1.484e-07
15-150 5.745e-07 1.707e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.53748 (-1.37744 2.00304)
R1^2/D10^2 : 0.947505 (-0.738383 4.59072)
kT2 [keV] : 22.8896 (-6.28371 12.8517)
R2^2/D10^2 : 2.30640E-03 (-0.00178594 0.00346604)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.69 using 59 PHA bins.
# Reduced chi-squared = 0.9216 for 55 degrees of freedom
# Null hypothesis probability = 6.398646e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.266e-07 6.750e-08
25- 50 1.421e-07 5.016e-08
50-150 3.365e-07 1.884e-07
15-150 6.052e-07 2.416e-07
Peak spectrum fit
Power-law model
Time interval is from 15.100 sec. to 16.100 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72414 ( -0.595866 0.648794 )
Norm@50keV : 3.15640E-03 ( -0.00117207 0.00109912 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.34 using 59 PHA bins.
# Reduced chi-squared = 0.6551 for 57 degrees of freedom
# Null hypothesis probability = 9.795641e-01
Photon flux (15-150 keV) in 1 sec: 0.422803 ( -0.135802 0.136176 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91725e-08 ( -1.06283e-08 1.11354e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 15.100 sec. to 16.100 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02844 ( -4.58015 0.00474871 )
Epeak [keV] : 11.6868 ( )
Norm@50keV : 2.06636E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.11 using 59 PHA bins.
# Reduced chi-squared = 0.6626 for 56 degrees of freedom
# Null hypothesis probability = 9.757521e-01
Photon flux (15-150 keV) in 1 sec: 0.422684 ( -0.135782 0.135987 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91899e-08 ( -1.27627e-08 1.09854e-08 ) ergs/cm2
Band function
Time interval is from 15.100 sec. to 16.100 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13106 ( 1.13723 1.13723 )
beta : -1.90710 ( 1.89548 0.760078 )
Epeak [keV] : 56.6780 ( -54.9978 -54.9978 )
Norm@50keV : 7.11511E-03 ( -0.00729529 708731 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.28 using 59 PHA bins.
# Reduced chi-squared = 0.6778 for 55 degrees of freedom
# Null hypothesis probability = 9.678113e-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] : 10.7007 (-3.17264 5.8215)
R^2/D10^2 : 0.154442 (-0.154399 0.431087)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.38 using 59 PHA bins.
# Reduced chi-squared = 0.6910 for 57 degrees of freedom
# Null hypothesis probability = 9.636541e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.673e-09 2.286e-09
25- 50 1.002e-08 6.130e-09
50-150 6.341e-09 4.431e-09
15-150 2.003e-08 1.315e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 141.667 (-99.3322 -136.856)
Norm : 1.72234 (-0.593183 1.22289)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.53 using 59 PHA bins.
# Reduced chi-squared = 0.6584 for 57 degrees of freedom
# Null hypothesis probability = 9.783785e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.444e-09 2.622e-09
25- 50 8.167e-09 4.963e-09
50-150 1.574e-08 1.040e-08
15-150 2.835e-08 1.751e-08
Double BB
R1^2/D10^2 : 0.283898 (-0.194213 0.505763)
kT2 [keV] : 74.1805 (-72.996 -72.9962)
R2^2/D10^2 : 2.40508E-04 (-0.000237717 0.0982198)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.62 using 59 PHA bins.
#Fit statistic : Chi-Squared = 36.64 using 59 PHA bins.
#Fit statistic : Chi-Squared = 36.55 using 59 PHA bins.
# Reduced chi-squared = 0.6841 for 55 degrees of freedom
# Reduced chi-squared = 0.6663 for 55 degrees of freedom
# Reduced chi-squared = 0.6646 for 55 degrees of freedom
# Null hypothesis probability = 9.646322e-01
# Null hypothesis probability = 9.731348e-01
# Null hypothesis probability = 9.738448e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.981e-09 1.997e-09
25- 50 9.355e-09 5.805e-09
50-150 7.405e-09 5.300e-09
15-150 2.074e-08 1.279e-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: 1.84257 ( -0.256592 0.270512 )
Norm@50keV : 8.97293E-04 ( -0.000140304 0.000135094 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.02 using 59 PHA bins.
# Reduced chi-squared = 0.8952 for 57 degrees of freedom
# Null hypothesis probability = 6.975636e-01
Photon flux (15-150 keV) in 72.08 sec: 0.125745 ( -0.0165434 0.016579 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.94757e-07 ( -9.14227e-08 9.31994e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.69553 ( -1.18925 0.284188 )
Epeak [keV] : 227.089 ( )
Norm@50keV : 3.59549E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.91 using 59 PHA bins.
# Reduced chi-squared = 0.8913 for 56 degrees of freedom
# Null hypothesis probability = 7.032501e-01
Photon flux (15-150 keV) in 72.08 sec: 0.126035 ( -0.016789 0.016338 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.96294e-07 ( -9.28189e-08 8.88516e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.47427 ( 1.47517 1.47517 )
beta : -1.84237 ( 1.84252 0.256177 )
Epeak [keV] : 17.1346 ( -16.8235 -16.8235 )
Norm@50keV : 2.19284E-03 ( -0.00220014 221492 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.02 using 59 PHA bins.
# Reduced chi-squared = 0.9277 for 55 degrees of freedom
# Null hypothesis probability = 6.272322e-01
Photon flux (15-150 keV) in 72.08 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) = 1.70e-07
S(50-100 keV) = 1.90e-07
T90 vs. Hardness ratio plot
T90 = 67.3120000362396 sec.
Hardness ratio (energy fluence ratio) = 1.11765
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.943688
Count Ratio (50-100 keV) / (15-25 keV) = 0.670818
Mask shadow pattern
IMX = 0.39265244746, IMY = 0.179854004739
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:
-239.000000 -26.456000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.5127 -60.5442 295.1 35.1 -109.4 0.0160 0.0 7.5 Cen X-3
186.6342 -62.7591 1.4 27.1 -110.2 2.3307 8.1 0.9 GX 301-2
244.9806 -15.6294 0.4 39.1 29.8 11.3274 29.2 0.7 Sco X-1
256.0021 -37.8089 0.8 20.7 63.3 3.3728 13.8 2.2 4U 1700-377
256.4534 -36.5425 3.5 22.0 62.4 0.8080 3.3 7.2 GX 349+2
263.1179 -24.7117 26.9 35.1 61.3 0.1867 0.4 6.3 GX 1+4
264.7926 -44.4522 4.6 20.0 90.4 0.6043 2.5 2.1 4U 1735-44
270.2369 -25.1584 5.8 37.8 71.3 1.1933 2.0 5.4 GX 5-1
270.4448 -25.8008 5.6 37.3 72.1 1.1666 2.1 8.4 GRS 1758-258
276.1112 -30.3691 6.0 36.4 83.3 -1.1577 -1.9 9.6 H1820-303
263.0793 -33.6914 9.1 27.2 69.9 0.3936 1.3 9.7 GX 354-0
218.2620 -35.1846 1.6 23.4 -24.6 1.4096 7.1 ------ UNKNOWN
209.5019 -64.7291 1.1 17.5 -119.3 2.1766 10.4 ------ UNKNOWN
48.7157 -67.9348 4.3 57.6 -165.4 2.9216 2.7 ------ UNKNOWN
185.4595 -52.9824 2.8 30.3 -90.8 1.2771 4.1 ------ UNKNOWN
191.1555 -18.1040 3.7 50.6 -44.6 3.5421 3.1 ------ UNKNOWN
138.0303 -64.0770 2.7 46.6 -125.1 3.8537 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-26.456000 45.624000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3974 -60.8153 4.1 35.0 -109.9 0.5295 2.8 11.8 Cen X-3
186.3575 -62.7260 5.8 27.3 -110.1 -0.2664 -2.0 8.6 GX 301-2
244.9265 -15.8052 0.0 38.9 29.7 0.5386 2.8 10.4 Sco X-1
255.7545 -37.8085 2.7 20.6 62.8 -0.4980 -4.2 11.2 4U 1700-377
256.4776 -36.5671 5.2 21.9 62.4 -0.2755 -2.2 8.9 GX 349+2
263.1990 -24.7946 12.6 35.0 61.5 -0.1923 -0.9 10.8 GX 1+4
264.7788 -44.4108 4.3 20.1 90.3 -0.3154 -2.7 2.8 4U 1735-44
270.3855 -24.9627 19.2 38.0 71.3 0.1892 0.6 8.9 GX 5-1
270.2836 -25.9078 4.8 37.2 72.0 0.6880 2.4 9.9 GRS 1758-258
276.0290 -30.2576 16.8 36.4 83.1 0.1993 0.7 8.5 H1820-303
263.0878 -33.7002 6.3 27.2 69.9 -0.2763 -1.8 9.5 GX 354-0
5.4896 -73.9370 2.3 47.1 -178.8 1.0630 5.1 ------ UNKNOWN
218.2858 -35.2005 1.7 23.3 -24.6 0.6886 6.7 ------ UNKNOWN
104.5515 -72.4106 2.3 49.2 -144.5 1.3293 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
278.100600 963.018000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9837 -15.6590 0.3 38.2 -139.6 31.6925 41.1 1.2 Sco X-1
255.9744 -37.8542 1.9 42.0 -177.2 4.8595 6.2 0.8 4U 1700-377
256.4659 -36.4367 3.9 40.7 -176.3 2.3058 2.9 1.7 GX 349+2
263.0478 -24.9437 8.1 28.3 -170.4 0.7542 1.4 12.1 GX 1+4
264.7634 -44.5153 9.1 44.1 169.4 1.1843 1.3 4.0 4U 1735-44
268.4834 -1.3490 6.0 13.2 -111.0 0.9100 1.9 9.3 SW J1753.5-0127
270.2581 -25.0372 1.7 24.6 177.4 3.2321 6.7 2.9 GX 5-1
270.2646 -25.7144 2.7 25.2 176.7 2.0690 4.2 2.7 GRS 1758-258
274.1051 -14.0052 2.9 13.3 -174.4 1.9330 3.9 6.1 GX 17+2
275.9147 -30.3489 2.7 27.9 162.6 2.6145 4.3 1.2 H1820-303
285.1694 -24.9970 8.6 22.3 143.5 0.7227 1.4 8.6 HT1900.1-2455
288.8879 11.0685 17.9 15.8 -0.7 0.3069 0.6 9.1 GRS 1915+105
299.5888 35.2107 0.8 41.8 -5.6 13.1022 14.9 0.6 Cyg X-1
308.1021 40.9219 3.2 50.1 -1.8 4.0748 3.6 1.9 Cyg X-3
263.1101 -33.8115 6.7 35.3 179.2 1.0781 1.7 6.2 GX 354-0
316.6649 -5.4169 3.9 35.1 67.3 3.1202 3.0 ------ UNKNOWN
265.6857 -53.4438 3.1 52.1 164.0 7.8806 3.7 ------ UNKNOWN
300.8842 25.3496 3.1 34.0 4.4 2.2758 3.7 ------ UNKNOWN
238.8594 -35.5422 2.5 51.1 -162.7 5.5968 4.6 ------ UNKNOWN
296.2120 53.9903 2.8 58.3 -17.8 11.6763 4.2 ------ UNKNOWN
247.6905 9.5734 2.7 36.0 -97.1 4.9114 4.2 ------ UNKNOWN
UNKNOWN
UNKNOWN
UNKNOWN
Plot creation:
Thu Oct 8 18:52:23 EDT 2015