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
5.6729 33.4689 0.0222 37.5224 121.0029 2.7972995 8.679 TRIG_00655097
Foreground time interval of the image:
-3.784 74.101 (delta_t = 77.885 [sec])
Background time interval of the image:
-239.000 -3.784 (delta_t = 235.216 [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 -3.784 sec. to 147.560 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37869 ( -0.121528 0.120801 )
Norm@50keV : 3.24642E-03 ( -0.000220117 0.000219911 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.98 using 59 PHA bins.
# Reduced chi-squared = 0.9294 for 57 degrees of freedom
# Null hypothesis probability = 6.267780e-01
Photon flux (15-150 keV) in 151.3 sec: 0.393484 ( -0.0277462 0.0278229 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.7673e-06 ( -3.54168e-07 3.55933e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.784 sec. to 147.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34504 ( -0.456322 0.151903 )
Epeak [keV] : 998.883 ( -999.974 -999.974 )
Norm@50keV : 3.37431E-03 ( -0.0003268 0.00220627 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.97 using 59 PHA bins.
# Reduced chi-squared = 0.9458 for 56 degrees of freedom
# Null hypothesis probability = 5.903999e-01
Photon flux (15-150 keV) in 151.3 sec: 0.392585 ( -0.028446 0.02854 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.75055e-06 ( -3.78159e-07 3.72092e-07 ) ergs/cm2
Band function
Time interval is from -3.784 sec. to 147.560 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.19195 ( -3.4246 -3.4246 )
beta : -1.46734 ( 1.45401 0.161387 )
Epeak [keV] : 34.6215 ( -27.7612 106.479 )
Norm@50keV : 0.205344 ( -0.202669 99.3215 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.06 using 59 PHA bins.
# Reduced chi-squared = 0.9284 for 55 degrees of freedom
# Null hypothesis probability = 6.258629e-01
Photon flux (15-150 keV) in 151.3 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] : 16.1150 (-1.51097 1.74269)
R^2/D10^2 : 3.48577E-02 (-0.0103967 0.0143268)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 109.72 using 59 PHA bins.
# Reduced chi-squared = 1.9249 for 57 degrees of freedom
# Null hypothesis probability = 3.416352e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.827e-07 3.866e-08
25- 50 1.197e-06 1.101e-07
50-150 2.179e-06 2.829e-07
15-150 3.658e-06 3.049e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-23.6198 -200)
Norm : 1.63308 (-0.110885 0.110885)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.61 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 57 degrees of freedom
# Null hypothesis probability = 3.809967e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.154e-07 4.705e-08
25- 50 1.184e-06 1.120e-07
50-150 2.596e-06 5.538e-07
15-150 4.396e-06 7.308e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.82476 (-1.49955 1.63651)
R1^2/D10^2 : 0.202625 (-0.0839299 0.164614)
kT2 [keV] : 42.1828 (-12.0889 35.5129)
R2^2/D10^2 : 1.18142E-03 (-0.000914826 0.00216906)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.83 using 59 PHA bins.
# Reduced chi-squared = 0.8879 for 55 degrees of freedom
# Null hypothesis probability = 7.078884e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.995e-07 1.063e-07
25- 50 1.221e-06 2.653e-07
50-150 3.126e-06 1.401e-06
15-150 4.847e-06 1.507e-06
Peak spectrum fit
Power-law model
Time interval is from 82.892 sec. to 83.892 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46489 ( -0.899888 0.981355 )
Norm@50keV : 8.66601E-03 ( -0.00378127 0.00314329 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.82 using 59 PHA bins.
# Reduced chi-squared = 0.9618 for 57 degrees of freedom
# Null hypothesis probability = 5.571572e-01
Photon flux (15-150 keV) in 1 sec: 1.07159 ( -0.38785 0.392233 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.27749e-08 ( -3.63061e-08 3.55689e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 82.892 sec. to 83.892 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.66060 ( )
Epeak [keV] : 643.509 ( )
Norm@50keV : 1.16769E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.08 using 59 PHA bins.
# Reduced chi-squared = 0.8943 for 56 degrees of freedom
# Null hypothesis probability = 6.974173e-01
Photon flux (15-150 keV) in 1 sec: 1.07242 ( -0.398815 0.3914 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.01103e-08 ( -3.32047e-08 3.85157e-08 ) ergs/cm2
Band function
Time interval is from 82.892 sec. to 83.892 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.19667 ( 1.19699 1.19699 )
beta : -1.45938 ( 1.46125 0.89786 )
Epeak [keV] : 24.6093 ( -24.7238 -24.7238 )
Norm@50keV : 1.82236E-02 ( -0.0182459 0.210863 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.82 using 59 PHA bins.
# Reduced chi-squared = 0.9968 for 55 degrees of freedom
# Null hypothesis probability = 4.813233e-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] : 19.9961 (-8.89124 -20.2649)
R^2/D10^2 : 4.18420E-02 (-0.0387741 0.523957)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.72 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 57 degrees of freedom
# Null hypothesis probability = 3.435208e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.635e-08 9.750e-09
25- 50 2.111e-09 1.492e-09
50-150 2.561e-12 3.515e-12
15-150 1.846e-08 1.084e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 4.32148 (-1.56342 1.56342)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.76 using 59 PHA bins.
# Reduced chi-squared = 0.9782 for 57 degrees of freedom
# Null hypothesis probability = 5.217641e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.076e-08 6.990e-09
25- 50 2.070e-08 1.292e-08
50-150 4.540e-08 2.858e-08
15-150 7.686e-08 4.656e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.59714 (-1.23799 2.64427)
R1^2/D10^2 : 201.730 (-195.114 37380.7)
kT2 [keV] : 49.8114 (-33.5243 -50.6908)
R2^2/D10^2 : 2.92552E-03 (-0.00264857 0.0582513)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.41 using 59 PHA bins.
# Reduced chi-squared = 0.9166 for 55 degrees of freedom
# Null hypothesis probability = 6.503600e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.533e-08 9.215e-09
25- 50 6.982e-09 3.889e-09
50-150 6.987e-08 4.175e-08
15-150 9.218e-08 5.225e-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: 1.28776 ( -0.176693 0.173286 )
Norm@50keV : 3.75525E-03 ( -0.000371708 0.000371683 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.35 using 59 PHA bins.
# Reduced chi-squared = 0.8132 for 57 degrees of freedom
# Null hypothesis probability = 8.421730e-01
Photon flux (15-150 keV) in 77.88 sec: 0.447017 ( -0.0465521 0.046696 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.89876e-06 ( -3.1012e-07 3.11799e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21104 ( -0.702935 0.237311 )
Epeak [keV] : 544.929 ( -545.171 -545.171 )
Norm@50keV : 4.09156E-03 ( -0.000665741 0.00466905 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.31 using 59 PHA bins.
# Reduced chi-squared = 0.8270 for 56 degrees of freedom
# Null hypothesis probability = 8.186712e-01
Photon flux (15-150 keV) in 77.88 sec: 0.445571 ( -0.047913 0.047598 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.88597e-06 ( -3.35959e-07 3.16497e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.21076 ( -4.2107 -4.2107 )
beta : -1.38613 ( -0.238581 0.203794 )
Epeak [keV] : 28.4179 ( -28.3569 175.019 )
Norm@50keV : 44.1460 ( -44.7894 272822 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.46 using 59 PHA bins.
# Reduced chi-squared = 0.8083 for 55 degrees of freedom
# Null hypothesis probability = 8.444500e-01
Photon flux (15-150 keV) in 77.88 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) = 1.11e-06
S(50-100 keV) = 1.70e-06
T90 vs. Hardness ratio plot
T90 = 112.272000014782 sec.
Hardness ratio (energy fluence ratio) = 1.53153
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.79177
Count Ratio (50-100 keV) / (15-25 keV) = 1.35356
Mask shadow pattern
IMX = -3.955551478037332E-01, IMY = -6.582393415296779E-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:
-239.000000 -3.784000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6495 22.0097 0.4 30.9 -56.5 9.9409 31.9 0.9 Crab
5.7123 33.4555 1.7 37.5 121.0 4.5795 6.7 ------ UNKNOWN
64.3498 -13.4073 2.8 49.2 1.9 2.1324 4.1 ------ UNKNOWN
68.5703 -3.6496 2.8 41.2 -8.0 1.4379 4.2 ------ UNKNOWN
53.7912 53.1760 0.8 19.1 -156.4 3.8976 15.2 ------ UNKNOWN
75.0694 19.7722 2.8 25.6 -43.0 1.0529 4.2 ------ UNKNOWN
75.9970 40.5277 2.7 20.6 -96.3 1.0477 4.2 ------ UNKNOWN
83.6425 2.3117 2.4 43.9 -31.7 2.0581 4.8 ------ UNKNOWN
92.1214 60.1106 2.4 37.0 -128.3 1.7960 4.8 ------ UNKNOWN
95.6751 37.6210 3.7 35.8 -89.8 1.7084 3.2 ------ UNKNOWN
97.9525 19.6404 2.8 43.7 -64.1 4.8083 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-3.784000 74.100600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.4791 22.1086 4.6 30.7 -56.5 0.3928 2.5 10.3 Crab
5.6740 33.4735 1.3 37.5 121.0 2.9164 9.0 ------ UNKNOWN
7.1758 72.7376 2.2 44.5 -178.2 1.1106 5.2 ------ UNKNOWN
80.8629 86.3718 2.5 52.7 -158.9 1.4360 4.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
133.900600 963.151000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5462 35.2655 3.5 53.6 175.6 7.5221 3.3 4.4 Cyg X-1
308.0662 40.9933 2.7 45.6 -179.3 4.4725 4.3 3.2 Cyg X-3
326.2685 38.4447 3.7 32.0 174.1 2.1253 3.1 8.7 Cyg X-2
319.9060 13.3215 2.8 46.1 139.1 9.9871 4.1 ------ UNKNOWN
332.6476 29.5135 3.0 28.3 154.8 2.8052 3.9 ------ UNKNOWN
44.2615 -0.7309 4.5 49.8 9.2 3.4798 2.6 ------ UNKNOWN
329.4214 32.4351 2.3 30.3 162.0 3.5546 5.0 ------ UNKNOWN
291.6525 42.4089 3.4 57.2 -173.8 10.0937 3.3 ------ UNKNOWN
288.0467 49.0084 4.0 57.7 -165.5 8.3714 2.9 ------ UNKNOWN
53.7393 53.1444 2.0 39.1 -71.2 8.8176 5.9 ------ UNKNOWN
286.7805 65.9830 3.0 55.3 -145.3 14.1328 4.0 ------ UNKNOWN
65.1300 41.3857 4.3 46.9 -54.0 6.4589 2.7 ------ UNKNOWN
347.3876 78.1653 2.9 45.4 -121.4 10.4289 3.9 ------ UNKNOWN
41.0542 69.9232 5.7 41.2 -98.7 5.9281 2.0 ------ UNKNOWN
Plot creation:
Wed Sep 30 10:59:25 EDT 2015