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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
97.5500 -19.1500 0.0143 37.4735 -139.7054 1.2131293 13.447 TRIG_00650141
Foreground time interval of the image:
-1.072 29.421 (delta_t = 30.493 [sec])
Background time interval of the image:
-156.479 -1.072 (delta_t = 155.407 [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 2.048000
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 2.048000
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 2.048000
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 -1.072 sec. to 325.420 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99132 ( -0.142559 0.14771 )
Norm@50keV : 7.06841E-04 ( -6.71842e-05 6.60973e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.28 using 59 PHA bins.
# Reduced chi-squared = 1.215 for 57 degrees of freedom
# Null hypothesis probability = 1.275057e-01
Photon flux (15-150 keV) in 326.5 sec: 0.105605 ( -0.0081702 0.00817498 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.12733e-06 ( -1.90749e-07 1.93326e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.072 sec. to 325.420 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43177 ( -0.784139 0.646561 )
Epeak [keV] : 42.1232 ( -39.6545 -42.1232 )
Norm@50keV : 1.48892E-03 ( -0.000846625 0.00276549 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.18 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 56 degrees of freedom
# Null hypothesis probability = 1.455662e-01
Photon flux (15-150 keV) in 326.5 sec: 0.103096 ( -0.0085045 0.00867 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00193e-06 ( -2.32125e-07 1.29271e-07 ) ergs/cm2
Band function
Time interval is from -1.072 sec. to 325.420 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.821563 ( -1.07608 2.73321 )
beta : -2.32866 ( 2.35823 0.35624 )
Epeak [keV] : 36.1592 ( -11.6106 16.4231 )
Norm@50keV : 3.75866E-03 ( -0.00430619 0.31962 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.13 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 55 degrees of freedom
# Null hypothesis probability = 1.648287e-01
Photon flux (15-150 keV) in 326.5 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01917e-06 ( -2.01689e-06 -2.09717e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.86694 (-0.827724 0.914141)
R^2/D10^2 : 5.13661E-02 (-0.0150094 0.0208808)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.81 using 59 PHA bins.
# Reduced chi-squared = 1.611 for 57 degrees of freedom
# Null hypothesis probability = 2.375146e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.310e-07 4.538e-08
25- 50 8.073e-07 7.281e-08
50-150 4.053e-07 8.164e-08
15-150 1.544e-06 1.422e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 66.3496 (-14.3994 20.7843)
Norm : 0.528474 (-0.0659221 0.0752161)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.18 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 57 degrees of freedom
# Null hypothesis probability = 1.676160e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.400e-07 4.636e-08
25- 50 6.897e-07 5.436e-08
50-150 8.507e-07 1.654e-07
15-150 1.980e-06 1.987e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.72855 (-1.96614 1.4968)
R1^2/D10^2 : 0.111027 (-0.0488475 0.110298)
kT2 [keV] : 32.7888 (-17.1702 -33.8026)
R2^2/D10^2 : 3.26454E-04 (-0.000267824 0.00275545)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.46 using 59 PHA bins.
# Reduced chi-squared = 1.227 for 55 degrees of freedom
# Null hypothesis probability = 1.207301e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.981e-07 7.689e-08
25- 50 7.360e-07 1.549e-07
50-150 9.366e-07 4.656e-07
15-150 2.071e-06 6.008e-07
Peak spectrum fit
Power-law model
Time interval is from 24.084 sec. to 25.084 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64020 ( -0.361876 0.37413 )
Norm@50keV : 7.28116E-03 ( -0.00169936 0.00167115 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.60 using 59 PHA bins.
# Reduced chi-squared = 0.9403 for 57 degrees of freedom
# Null hypothesis probability = 6.034373e-01
Photon flux (15-150 keV) in 1 sec: 0.947692 ( -0.213821 0.21433 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.77852e-08 ( -1.64321e-08 1.66723e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 24.084 sec. to 25.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01966 ( -1.90594 0.95142 )
Epeak [keV] : 75.7865 ( )
Norm@50keV : 1.55330E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.06 using 59 PHA bins.
# Reduced chi-squared = 0.9474 for 56 degrees of freedom
# Null hypothesis probability = 5.870442e-01
Photon flux (15-150 keV) in 1 sec: 0.933329 ( -0.216876 0.216981 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.53488e-08 ( -1.73591e-08 1.76246e-08 ) ergs/cm2
Band function
Time interval is from 24.084 sec. to 25.084 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04226 ( -0.926268 1.52792 )
beta : -9.37127 ( 9.37161 19.3716 )
Epeak [keV] : 77.3732 ( -34.8768 -77.2951 )
Norm@50keV : 1.50567E-02 ( -0.00851197 0.0184979 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.06 using 59 PHA bins.
# Reduced chi-squared = 0.9647 for 55 degrees of freedom
# Null hypothesis probability = 5.492407e-01
Photon flux (15-150 keV) in 1 sec: 0.933392 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.55177e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.5091 (-3.29477 4.27453)
R^2/D10^2 : 0.157377 (-0.100252 0.273601)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.32 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 57 degrees of freedom
# Null hypothesis probability = 4.632036e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.083e-09 2.861e-09
25- 50 2.182e-08 8.322e-09
50-150 2.573e-08 1.310e-08
15-150 5.363e-08 2.252e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 163.137 (-94.9926 -160.664)
Norm : 3.91077 (-0.905858 1.34196)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.15 using 59 PHA bins.
# Reduced chi-squared = 0.9324 for 57 degrees of freedom
# Null hypothesis probability = 6.203856e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.967e-09 5.775e-09
25- 50 1.869e-08 1.048e-08
50-150 3.816e-08 2.307e-08
15-150 6.682e-08 3.876e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.19343 (-3.9546 -7.20206)
R1^2/D10^2 : 0.991978 (-0.824177 16.0926)
kT2 [keV] : 24.6430 (-21.462 -24.7083)
R2^2/D10^2 : 1.25843E-02 (-0.012409 0.117214)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.69 using 59 PHA bins.
# Reduced chi-squared = 0.9581 for 55 degrees of freedom
# Null hypothesis probability = 5.632350e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.813e-09 5.905e-09
25- 50 1.976e-08 1.081e-08
50-150 3.622e-08 2.136e-08
15-150 6.580e-08 3.380e-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: 1.54344 ( -0.164581 0.165045 )
Norm@50keV : 2.94307E-03 ( -0.000297019 0.000296086 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.91 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 57 degrees of freedom
# Null hypothesis probability = 2.750930e-01
Photon flux (15-150 keV) in 30.49 sec: 0.371873 ( -0.0380924 0.0381853 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.45564e-07 ( -9.09175e-08 9.15584e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.706698 ( -0.843023 0.707084 )
Epeak [keV] : 75.0167 ( -17.7866 128.855 )
Norm@50keV : 7.98163E-03 ( -0.0044797 0.0135138 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.74 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 56 degrees of freedom
# Null hypothesis probability = 3.754555e-01
Photon flux (15-150 keV) in 30.49 sec: 0.360088 ( -0.039421 0.039477 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.95353e-07 ( -1.00599e-07 1.01504e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.75825 ( -5.28605 -4.75825 )
beta : -1.83568 ( -0.257543 0.231623 )
Epeak [keV] : 31.4877 ( -5.64013 4.66054 )
Norm@50keV : 57.5436 ( -5.61102 216.3 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.38 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 55 degrees of freedom
# Null hypothesis probability = 4.601982e-01
Photon flux (15-150 keV) in 30.49 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.12113e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 6.39e-07
S(50-100 keV) = 6.43e-07
T90 vs. Hardness ratio plot
T90 = 280.007999956608 sec.
Hardness ratio (energy fluence ratio) = 1.00626
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.14687
Count Ratio (50-100 keV) / (15-25 keV) = 0.481595
Mask shadow pattern
IMX = -5.847028009758013E-01, IMY = 4.957694187770598E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-156.479410 -1.072000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4984 -40.5544 0.9 5.9 -40.4 1.6006 12.7 1.4 Vela X-1
170.3035 -60.5685 3.5 28.1 55.2 0.6217 3.3 3.3 Cen X-3
186.8845 -62.7841 21.1 36.2 57.0 -0.1675 -0.6 6.3 GX 301-2
75.1641 -28.9110 2.3 45.9 -171.6 1.2076 5.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.072000 29.420610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.3724 -40.7293 0.0 5.7 -40.1 0.1608 2.9 12.7 Vela X-1
170.6793 -60.6529 4.7 28.3 55.2 0.1866 2.4 10.8 Cen X-3
186.9888 -62.7297 4.8 36.2 56.9 0.2957 2.4 9.4 GX 301-2
66.6817 -40.7863 3.0 45.5 169.1 0.4874 3.8 ------ UNKNOWN
162.5606 -39.4190 2.2 24.4 5.4 0.3345 5.4 ------ UNKNOWN
97.5496 -19.1503 0.9 37.5 -139.7 1.2126 13.4 ------ UNKNOWN
137.3155 -3.2399 1.8 42.3 -72.2 1.5340 6.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
91.620610 782.210300
840.120000 902.221600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6372 22.0173 0.3 43.4 -143.0 30.5063 34.8 0.3 Crab
135.5264 -40.5603 0.8 38.8 7.7 8.6502 14.0 0.4 Vela X-1
46.3413 -13.7108 2.8 49.3 144.1 9.5939 4.1 ------ UNKNOWN
127.5343 -42.9988 3.2 34.7 16.0 2.1770 3.6 ------ UNKNOWN
102.5352 -32.0939 2.7 13.7 37.8 1.7210 4.3 ------ UNKNOWN
86.2235 -10.4236 3.2 14.0 -177.0 1.4456 3.6 ------ UNKNOWN
54.6037 19.5828 2.9 57.2 -173.8 9.3291 4.0 ------ UNKNOWN
56.5157 21.8993 3.2 57.4 -170.4 7.3067 3.6 ------ UNKNOWN
Plot creation:
Sat Aug 8 00:28:01 EDT 2015