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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
66.1305 64.0489 0.0089 28.9334 16.1265 1.3642821 21.684 TRIG_00511235
Foreground time interval of the image:
-6.284 12.301 (delta_t = 18.585 [sec])
Background time interval of the image:
-748.599 -731.865 (delta_t = 16.734 [sec])
-239.000 -34.849 (delta_t = 204.151 [sec])
-34.000 -6.284 (delta_t = 27.716 [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 1.024000
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 1.024000
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 1.024000
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)
The mask-weighted light curves based on cleaned DPHs
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 -6.284 sec. to 62.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52732 ( -0.165795 0.167349 )
Norm@50keV : 1.52209E-03 ( -0.000151025 0.000149772 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.39 using 59 PHA bins.
# Reduced chi-squared = 0.9543 for 57 degrees of freedom
# Null hypothesis probability = 5.734797e-01
Photon flux (15-150 keV) in 68.92 sec: 0.191447 ( -0.0182203 0.0182342 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.90877e-07 ( -1.07548e-07 1.08847e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.284 sec. to 62.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31581 ( -0.659743 0.358554 )
Epeak [keV] : 154.316 ( -154.334 -154.334 )
Norm@50keV : 1.96894E-03 ( -0.000729848 0.00233694 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.02 using 59 PHA bins.
# Reduced chi-squared = 0.9647 for 56 degrees of freedom
# Null hypothesis probability = 5.501570e-01
Photon flux (15-150 keV) in 68.92 sec: 0.189741 ( -0.018825 0.018796 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.71848e-07 ( -1.2101e-07 1.20327e-07 ) ergs/cm2
Band function
Time interval is from -6.284 sec. to 62.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93702 ( -13.8377 -4.93702 )
beta : -1.65982 ( -0.24139 0.198445 )
Epeak [keV] : 25.3158 ( -6.19266 4.22044 )
Norm@50keV : 141.433 ( -13.2045 752.945 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.95 using 59 PHA bins.
# Reduced chi-squared = 0.9264 for 55 degrees of freedom
# Null hypothesis probability = 6.300284e-01
Photon flux (15-150 keV) in 68.92 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] : 14.0350 (-1.80186 2.10926)
R^2/D10^2 : 2.67819E-02 (-0.0103949 0.0168666)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.87 using 59 PHA bins.
# Reduced chi-squared = 1.471 for 57 degrees of freedom
# Null hypothesis probability = 1.179265e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.678e-08 1.324e-08
25- 50 2.863e-07 3.894e-08
50-150 3.718e-07 8.436e-08
15-150 7.349e-07 9.918e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.329 (-72.7754 -199.344)
Norm : 0.780451 (-0.0732821 0.0733539)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.06 using 59 PHA bins.
# Reduced chi-squared = 0.9485 for 57 degrees of freedom
# Null hypothesis probability = 5.859971e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.339e-07 4.494e-08
25- 50 2.577e-07 7.602e-08
50-150 5.650e-07 2.999e-07
15-150 9.566e-07 3.933e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.48690 (-1.40826 1.80073)
R1^2/D10^2 : 0.278349 (-0.156908 0.396331)
kT2 [keV] : 26.1651 (-6.02892 12.4063)
R2^2/D10^2 : 2.43581E-03 (-0.00175439 0.00378911)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.28 using 59 PHA bins.
# Reduced chi-squared = 0.9323 for 55 degrees of freedom
# Null hypothesis probability = 6.175733e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.385e-07 5.671e-08
25- 50 2.530e-07 8.208e-08
50-150 5.868e-07 2.980e-07
15-150 9.783e-07 3.701e-07
Peak spectrum fit
Power-law model
Time interval is from 0.460 sec. to 1.460 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33705 ( -0.200885 0.202973 )
Norm@50keV : 1.24783E-02 ( -0.00152589 0.0015219 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.58 using 59 PHA bins.
# Reduced chi-squared = 0.6593 for 57 degrees of freedom
# Null hypothesis probability = 9.780491e-01
Photon flux (15-150 keV) in 1 sec: 1.49933 ( -0.183847 0.184042 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22231e-07 ( -1.66277e-08 1.67798e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.460 sec. to 1.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.644469 ( -1.02836 0.772776 )
Epeak [keV] : 103.628 ( -34.71 -103.627 )
Norm@50keV : 2.70038E-02 ( -0.0152669 0.0546578 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.59 using 59 PHA bins.
# Reduced chi-squared = 0.6355 for 56 degrees of freedom
# Null hypothesis probability = 9.848147e-01
Photon flux (15-150 keV) in 1 sec: 1.46375 ( -0.19024 0.18949 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18022e-07 ( -1.7803e-08 1.7771e-08 ) ergs/cm2
Band function
Time interval is from 0.460 sec. to 1.460 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.645371 ( -0.548016 0.895865 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 103.679 ( -27.8412 635.652 )
Norm@50keV : 2.69767E-02 ( -0.0152323 0.0546554 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.59 using 59 PHA bins.
# Reduced chi-squared = 0.6471 for 55 degrees of freedom
# Null hypothesis probability = 9.804324e-01
Photon flux (15-150 keV) in 1 sec: 1.47641 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20081e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.0209 (-2.31854 2.75694)
R^2/D10^2 : 0.118226 (-0.0471958 0.0756749)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.22 using 59 PHA bins.
# Reduced chi-squared = 0.7758 for 57 degrees of freedom
# Null hypothesis probability = 8.918671e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.973e-09 1.560e-09
25- 50 3.088e-08 5.315e-09
50-150 6.391e-08 1.596e-08
15-150 1.018e-07 1.657e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 6.18996 (-0.751505 0.751463)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.56 using 59 PHA bins.
# Reduced chi-squared = 0.6940 for 57 degrees of freedom
# Null hypothesis probability = 9.619415e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.541e-08 8.625e-09
25- 50 2.965e-08 1.622e-08
50-150 6.503e-08 3.561e-08
15-150 1.101e-07 6.105e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.09111 (-2.15156 8.8888)
R1^2/D10^2 : 7.91284 (-7.61095 583.771)
kT2 [keV] : 20.1624 (-3.59024 25.7466)
R2^2/D10^2 : 6.15988E-02 (-0.058828 0.0456894)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.73 using 59 PHA bins.
# Reduced chi-squared = 0.6497 for 55 degrees of freedom
# Null hypothesis probability = 9.795526e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.283e-08 6.020e-09
25- 50 2.718e-08 7.835e-09
50-150 7.274e-08 2.145e-08
15-150 1.128e-07 3.673e-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: 1.49694 ( -0.121371 0.121907 )
Norm@50keV : 4.73300E-03 ( -0.000333521 0.000332212 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.09 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 57 degrees of freedom
# Null hypothesis probability = 2.996136e-01
Photon flux (15-150 keV) in 18.58 sec: 0.590379 ( -0.0412445 0.0412904 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.34649e-07 ( -6.45523e-08 6.5033e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27234 ( -0.491643 0.28905 )
Epeak [keV] : 159.971 ( -159.983 -159.983 )
Norm@50keV : 6.16874E-03 ( -0.00170533 0.00467156 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.36 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 56 degrees of freedom
# Null hypothesis probability = 2.898588e-01
Photon flux (15-150 keV) in 18.58 sec: 0.584254 ( -0.043003 0.042937 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.1935e-07 ( -7.21889e-08 7.1821e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99887 ( -14.9911 -4.99887 )
beta : -1.57510 ( -0.142456 0.136855 )
Epeak [keV] : 23.9421 ( -5.3916 3.72245 )
Norm@50keV : 657.266 ( -44.6856 2605.48 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.51 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.477822e-01
Photon flux (15-150 keV) in 18.58 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) = 2.48e-07
S(50-100 keV) = 3.45e-07
T90 vs. Hardness ratio plot
T90 = 63.4999999403954 sec.
Hardness ratio (energy fluence ratio) = 1.39113
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.23114
Count Ratio (50-100 keV) / (15-25 keV) = 1.01829
Mask shadow pattern
IMX = 5.310376570901550E-01, IMY = -1.535421415736369E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
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:
-748.599400 -731.865300
-239.000000 -34.849300
-34.000000 -6.284000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6541 22.0091 1.1 39.5 97.1 9.0544 10.6 1.2 Crab
10.0686 32.8341 2.2 26.2 -99.5 1.3737 5.3 ------ UNKNOWN
11.1388 27.5550 3.6 27.8 -110.8 0.8704 3.2 ------ UNKNOWN
2.1397 34.5024 2.6 31.8 -91.4 1.4079 4.4 ------ UNKNOWN
7.1489 0.5215 3.6 49.7 -137.9 2.6740 3.2 430.1 UNKNOWN
328.9875 57.8448 2.6 49.1 -48.1 4.7145 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-6.284000 12.300600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.4574 21.9643 3.5 39.4 97.3 0.6370 3.3 10.2 Crab
104.4571 77.6952 2.2 46.4 9.3 0.5453 5.2 ------ UNKNOWN
66.1305 64.0489 0.5 28.9 16.1 1.3643 21.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
63.900600 963.099000
1257.000000 1409.160000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
194.9918 76.3282 3.1 36.0 -18.9 2.6304 3.7 ------ UNKNOWN
19.7459 30.6801 3.9 44.1 -153.6 3.1854 3.0 ------ UNKNOWN
336.3593 57.2295 4.7 40.8 -93.1 8.9075 2.5 ------ UNKNOWN
Plot creation:
Sat May 30 20:42:53 EDT 2015