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
67.4276 5.7302 0.0032 29.2594 -46.4609 3.8663000 59.666 TRIG_00655262
Foreground time interval of the image:
-1.036 9.612 (delta_t = 10.648 [sec])
Background time interval of the image:
-331.107 -313.753 (delta_t = 17.355 [sec])
-239.608 -1.036 (delta_t = 238.572 [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 0.512000
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 0.512000
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 0.512000
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 -1.036 sec. to 9.612 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92945 ( -0.0517137 0.0520372 )
Norm@50keV : 2.26401E-02 ( -0.000674447 0.000672961 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.43 using 59 PHA bins.
# Reduced chi-squared = 1.709 for 57 degrees of freedom
# Null hypothesis probability = 6.832098e-04
Photon flux (15-150 keV) in 10.65 sec: 3.29045 ( -0.102651 0.103028 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.21775e-06 ( -6.52218e-08 6.53024e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.036 sec. to 9.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01792 ( -0.263649 0.248601 )
Epeak [keV] : 51.5726 ( -3.44078 4.14332 )
Norm@50keV : 6.63668E-02 ( -0.0165991 0.0238765 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.12 using 59 PHA bins.
# Reduced chi-squared = 0.9307 for 56 degrees of freedom
# Null hypothesis probability = 6.225730e-01
Photon flux (15-150 keV) in 10.65 sec: 3.09697 ( -0.11233 0.11283 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06652e-06 ( -7.51145e-08 7.5434e-08 ) ergs/cm2
Band function
Time interval is from -1.036 sec. to 9.612 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.388848 ( -0.646233 0.954989 )
beta : -2.36362 ( -0.509809 0.174686 )
Epeak [keV] : 43.4937 ( -6.2038 8.06869 )
Norm@50keV : 0.162106 ( -0.0995641 0.527703 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.24 using 59 PHA bins.
# Reduced chi-squared = 0.8590 for 55 degrees of freedom
# Null hypothesis probability = 7.621065e-01
Photon flux (15-150 keV) in 10.65 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08581e-06 ( -2.08574e-06 -7.29099e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2076 ( )
R^2/D10^2 : 0.703896 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 213.53 using 59 PHA bins.
# Reduced chi-squared = 3.7461 for 57 degrees of freedom
# Null hypothesis probability = 6.077476e-20
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.366e-07 1.193e-08
25- 50 7.596e-07 2.487e-08
50-150 6.884e-07 3.919e-08
15-150 1.685e-06 5.059e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 82.8585 (-7.25497 8.41692)
Norm : 15.0708 (-0.711485 0.751951)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.40 using 59 PHA bins.
# Reduced chi-squared = 0.9719 for 57 degrees of freedom
# Null hypothesis probability = 5.353227e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.173e-07 1.853e-08
25- 50 6.928e-07 2.082e-08
50-150 1.001e-06 5.591e-08
15-150 2.111e-06 6.443e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.35670 (-0.82118 0.847429)
R1^2/D10^2 : 3.14317 (-0.891367 1.44769)
kT2 [keV] : 21.0920 (-2.48822 3.63825)
R2^2/D10^2 : 5.73113E-02 (-0.0284053 0.0430748)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.32 using 59 PHA bins.
# Reduced chi-squared = 0.9331 for 55 degrees of freedom
# Null hypothesis probability = 6.159190e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.568e-07 3.296e-08
25- 50 7.238e-07 5.011e-08
50-150 9.663e-07 1.395e-07
15-150 2.047e-06 1.800e-07
Peak spectrum fit
Power-law model
Time interval is from 3.896 sec. to 4.896 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72633 ( -0.0933311 0.0946146 )
Norm@50keV : 3.84703E-02 ( -0.00225833 0.00224608 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.12 using 59 PHA bins.
# Reduced chi-squared = 0.9671 for 57 degrees of freedom
# Null hypothesis probability = 5.457963e-01
Photon flux (15-150 keV) in 1 sec: 5.15719 ( -0.291132 0.291423 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.55504e-07 ( -2.16414e-08 2.1741e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.896 sec. to 4.896 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05840 ( -0.43621 0.395239 )
Epeak [keV] : 67.2248 ( -11.0557 30.3454 )
Norm@50keV : 8.63756E-02 ( -0.0322756 0.0588398 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.28 using 59 PHA bins.
# Reduced chi-squared = 0.8264 for 56 degrees of freedom
# Null hypothesis probability = 8.195576e-01
Photon flux (15-150 keV) in 1 sec: 5.02248 ( -0.30178 0.30173 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.3942e-07 ( -2.3702e-08 2.378e-08 ) ergs/cm2
Band function
Time interval is from 3.896 sec. to 4.896 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.978053 ( -0.45039 3.15498 )
beta : -2.34692 ( 2.35226 0.507711 )
Epeak [keV] : 63.2163 ( -32.0294 30.2602 )
Norm@50keV : 9.65955E-02 ( -0.040897 19.1884 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.94 using 59 PHA bins.
# Reduced chi-squared = 0.8352 for 55 degrees of freedom
# Null hypothesis probability = 8.029780e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.39573e-07 ( -3.39566e-07 -2.3606e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.8531 (-0.821424 0.887389)
R^2/D10^2 : 0.985800 (-0.216829 0.273675)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 104.67 using 59 PHA bins.
# Reduced chi-squared = 1.8364 for 57 degrees of freedom
# Null hypothesis probability = 1.219605e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.454e-08 3.825e-09
25- 50 1.175e-07 8.000e-09
50-150 1.219e-07 1.500e-08
15-150 2.740e-07 1.830e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 122.452 (-24.9634 32.5508)
Norm : 21.9168 (-1.51099 1.77583)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.10 using 59 PHA bins.
# Reduced chi-squared = 0.8263 for 57 degrees of freedom
# Null hypothesis probability = 8.222510e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.704e-08 5.250e-09
25- 50 1.024e-07 7.095e-09
50-150 1.845e-07 5.405e-08
15-150 3.440e-07 6.020e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.41363 (-1.30916 1.56572)
R1^2/D10^2 : 7.34505 (-3.64907 9.07294)
kT2 [keV] : 20.6004 (-3.13201 5.35)
R2^2/D10^2 : 0.131206 (-0.0806185 0.129669)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.54 using 59 PHA bins.
# Reduced chi-squared = 0.8643 for 55 degrees of freedom
# Null hypothesis probability = 7.524026e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.452e-08 1.255e-08
25- 50 1.043e-07 2.148e-08
50-150 1.761e-07 4.350e-08
15-150 3.349e-07 6.110e-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: 1.92945 ( -0.0517137 0.0520372 )
Norm@50keV : 2.26401E-02 ( -0.000674447 0.000672961 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.43 using 59 PHA bins.
# Reduced chi-squared = 1.709 for 57 degrees of freedom
# Null hypothesis probability = 6.832098e-04
Photon flux (15-150 keV) in 10.65 sec: 3.29045 ( -0.102651 0.103028 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.21775e-06 ( -6.52218e-08 6.53024e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01792 ( -0.263649 0.248601 )
Epeak [keV] : 51.5726 ( -3.44078 4.14332 )
Norm@50keV : 6.63668E-02 ( -0.0165991 0.0238765 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.12 using 59 PHA bins.
# Reduced chi-squared = 0.9307 for 56 degrees of freedom
# Null hypothesis probability = 6.225730e-01
Photon flux (15-150 keV) in 10.65 sec: 3.09697 ( -0.11233 0.11283 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06652e-06 ( -7.51145e-08 7.5434e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.388848 ( -0.646233 0.954989 )
beta : -2.36362 ( -0.509809 0.174686 )
Epeak [keV] : 43.4937 ( -6.2038 8.06869 )
Norm@50keV : 0.162106 ( -0.0995641 0.527703 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.24 using 59 PHA bins.
# Reduced chi-squared = 0.8590 for 55 degrees of freedom
# Null hypothesis probability = 7.621065e-01
Photon flux (15-150 keV) in 10.65 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08581e-06 ( -2.08574e-06 -7.29099e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 6.53e-07
S(50-100 keV) = 6.86e-07
T90 vs. Hardness ratio plot
T90 = 7.13599991798401 sec.
Hardness ratio (energy fluence ratio) = 1.05054
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.35482
Count Ratio (50-100 keV) / (15-25 keV) = 0.714373
Mask shadow pattern
IMX = 3.859220204291111E-01, IMY = 4.061216438628479E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-331.107400 -313.752700
-239.608000 -1.036000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
0.1199 6.9115 3.0 39.8 105.7 3.3842 3.9 414.8 UNKNOWN
53.7371 53.1658 1.1 38.2 -141.4 3.3977 10.6 ------ UNKNOWN
52.8183 69.0330 2.8 53.1 -149.2 3.1505 4.1 ------ UNKNOWN
75.6458 56.1866 2.9 48.0 -129.0 3.6996 3.9 ------ UNKNOWN
77.0078 52.9546 2.4 46.6 -124.9 4.6806 4.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.036000 9.612000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
48.4036 -36.9370 2.4 54.2 16.3 1.2323 4.8 ------ UNKNOWN
27.8045 30.0898 3.1 17.3 168.2 0.1918 3.7 ------ UNKNOWN
67.4276 5.7302 0.2 29.3 -46.5 3.8662 59.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
63.892600 962.455100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6362 22.0113 0.2 22.6 -131.6 36.8914 54.6 0.3 Crab
59.3210 -46.4914 2.7 52.7 13.0 12.0267 4.2 ------ UNKNOWN
53.7760 53.1985 2.3 48.8 175.2 7.7951 5.1 ------ UNKNOWN
106.2357 50.6385 6.1 55.3 -145.1 7.8084 1.9 ------ UNKNOWN
108.8260 -17.1360 3.6 46.9 -54.0 8.9086 3.2 ------ UNKNOWN
Plot creation:
Wed Sep 30 10:57:45 EDT 2015