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
26.8407 30.8797 0.0153 14.0080 86.4636 1.0985798 12.601 TRIG_00773509
Foreground time interval of the image:
-21.816 13.000 (delta_t = 34.816 [sec])
Background time interval of the image:
-239.224 -21.816 (delta_t = 217.408 [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 4.096000
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 4.096000
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 4.096000
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 -21.816 sec. to 13.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75914 ( -0.169665 0.175926 )
Norm@50keV : 2.07772E-03 ( -0.000244199 0.000240883 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.76 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 57 degrees of freedom
# Null hypothesis probability = 4.107819e-01
Photon flux (15-150 keV) in 34.82 sec: 0.281908 ( -0.028606 0.028614 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.67357e-07 ( -8.02611e-08 8.17417e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -21.816 sec. to 13.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.65121E-02 ( -1.18272 0.926106 )
Epeak [keV] : 48.5278 ( -6.70072 8.22668 )
Norm@50keV : 1.88750E-02 ( -0.0188772 0.0706181 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.22 using 59 PHA bins.
# Reduced chi-squared = 0.8432 for 56 degrees of freedom
# Null hypothesis probability = 7.920156e-01
Photon flux (15-150 keV) in 34.82 sec: 0.266217 ( -0.029455 0.029566 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.74857e-07 ( -8.09008e-08 8.89602e-08 ) ergs/cm2
Band function
Time interval is from -21.816 sec. to 13.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 11.4123 (-1.1437 1.29293)
R^2/D10^2 : 8.60040E-02 (-0.0283484 0.0411634)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.92 using 59 PHA bins.
# Reduced chi-squared = 0.9108 for 57 degrees of freedom
# Null hypothesis probability = 6.657458e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.202e-08 1.386e-08
25- 50 2.429e-07 2.746e-08
50-150 1.837e-07 4.588e-08
15-150 5.087e-07 6.407e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 95.9506 (-27.9433 51.5235)
Norm : 1.27549 (-0.164901 0.194293)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.30 using 59 PHA bins.
# Reduced chi-squared = 0.9175 for 57 degrees of freedom
# Null hypothesis probability = 6.518038e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.160e-07 1.755e-08
25- 50 1.990e-07 2.437e-08
50-150 3.148e-07 1.320e-07
15-150 6.299e-07 1.490e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.08649 (-7.57306 -7.57378)
R1^2/D10^2 : 0.186042 (-0.111378 -0.18462)
kT2 [keV] : 18.3492 (-18.5738 -18.574)
R2^2/D10^2 : 8.12810E-03 (-0.0076345 0.0820842)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.43 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.39 using 59 PHA bins.
# Reduced chi-squared = 0.8623 for 55 degrees of freedom
# Reduced chi-squared = 0.8616 for 55 degrees of freedom
# Null hypothesis probability = 7.560594e-01
# Null hypothesis probability = 7.573169e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.742e-08 5.416e-08
25- 50 2.257e-07 1.192e-07
50-150 2.520e-07 1.385e-07
15-150 5.751e-07 2.881e-07
Peak spectrum fit
Power-law model
Time interval is from 2.740 sec. to 3.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65938 ( -0.417728 0.453788 )
Norm@50keV : 5.98108E-03 ( -0.00160672 0.00150309 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.29 using 59 PHA bins.
# Reduced chi-squared = 1.181 for 57 degrees of freedom
# Null hypothesis probability = 1.653594e-01
Photon flux (15-150 keV) in 1 sec: 0.783444 ( -0.172347 0.172354 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.55815e-08 ( -1.52829e-08 1.58106e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.740 sec. to 3.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.24371 ( -1.4725 0.767739 )
Epeak [keV] : 90.6312 ( )
Norm@50keV : 3.02449E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.17 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 56 degrees of freedom
# Null hypothesis probability = 1.457616e-01
Photon flux (15-150 keV) in 1 sec: 0.621499 ( -0.26491 0.182075 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.88562e-08 ( -1.57792e-08 9.73974e-09 ) ergs/cm2
Band function
Time interval is from 2.740 sec. to 3.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 13.5889 (-7.31113 8.77633)
R^2/D10^2 : 0.114719 (-0.0959209 1.85821)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.82 using 59 PHA bins.
# Reduced chi-squared = 1.400 for 57 degrees of freedom
# Null hypothesis probability = 2.472058e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.113e-09 3.453e-09
25- 50 1.724e-08 7.997e-09
50-150 1.171e-08 7.858e-09
15-150 3.506e-08 1.896e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 177.090 (-115.603 -175.388)
Norm : 3.17549 (-0.719036 1.06108)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.21 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 57 degrees of freedom
# Null hypothesis probability = 1.470147e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.023e-09 4.601e-09
25- 50 1.521e-08 8.710e-09
50-150 3.202e-08 1.871e-08
15-150 5.525e-08 3.177e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.09450 (-1.60937 2.07682)
R1^2/D10^2 : 3.52479 (-2.65004 14.8286)
kT2 [keV] : 29.2389 (-10.6147 38.4355)
R2^2/D10^2 : 7.34336E-03 (-0.00648863 0.0245696)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.46 using 59 PHA bins.
# Reduced chi-squared = 1.172 for 55 degrees of freedom
# Null hypothesis probability = 1.793050e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.023e-08 6.020e-09
25- 50 1.240e-08 6.595e-09
50-150 3.740e-08 2.334e-08
15-150 6.004e-08 3.253e-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: 1.75914 ( -0.169665 0.175926 )
Norm@50keV : 2.07772E-03 ( -0.000244199 0.000240883 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.76 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 57 degrees of freedom
# Null hypothesis probability = 4.107819e-01
Photon flux (15-150 keV) in 34.82 sec: 0.281895 ( -0.0286042 0.0286119 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.67252e-07 ( -8.02134e-08 8.17737e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.64479E-02 ( -1.1827 0.926124 )
Epeak [keV] : 48.5275 ( -6.70073 12.5347 )
Norm@50keV : 1.88766E-02 ( -0.0188772 0.0706178 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.22 using 59 PHA bins.
# Reduced chi-squared = 0.8432 for 56 degrees of freedom
# Null hypothesis probability = 7.920156e-01
Photon flux (15-150 keV) in 34.82 sec: 0.266186 ( -0.029447 0.029558 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.75024e-07 ( -8.09739e-08 8.88328e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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) = 1.85e-07
S(50-100 keV) = 2.19e-07
T90 vs. Hardness ratio plot
T90 = 28.8000000119209 sec.
Hardness ratio (energy fluence ratio) = 1.18378
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.50876
Count Ratio (50-100 keV) / (15-25 keV) = 0.659303
Mask shadow pattern
IMX = 1.538833695729371E-02, IMY = -2.490014657164326E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-239.224000 -21.816000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6175 21.9941 0.6 44.8 -24.2 8.3999 20.6 1.5 Crab
325.9375 38.4099 0.0 51.5 163.7 3.1532 3.4 12.2 Cyg X-2
64.6359 -3.8586 2.5 53.7 16.7 4.6732 4.6 ------ UNKNOWN
72.6056 -1.4005 2.5 55.4 6.7 5.0672 4.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-21.816000 13.000000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6491 22.1945 6.0 44.7 -24.4 0.2748 1.9 10.8 Crab
326.1750 38.3138 134.5 51.4 163.5 0.0276 0.1 0.5 Cyg X-2
46.0415 6.5880 2.6 37.6 36.5 0.5916 4.5 ------ UNKNOWN
26.8407 30.8796 0.9 14.0 86.5 1.0983 12.6 ------ UNKNOWN
92.1097 12.5773 2.2 57.1 -22.0 1.9253 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
81.076600 962.796400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
326.3497 38.1678 0.0 49.5 160.6 -3.0032 -1.4 12.5 Cyg X-2
321.2868 37.4888 3.7 53.6 160.8 11.4237 3.2 ------ UNKNOWN
Plot creation:
Fri Oct 20 14:59:24 EDT 2017