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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
343.2186 70.3083 0.0151 11.4904 -117.9107 0.6521102 12.712 TRIG_00501095
Foreground time interval of the image:
-3.072 27.629 (delta_t = 30.701 [sec])
Background time interval of the image:
-239.072 -3.072 (delta_t = 236.000 [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)
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 -3.072 sec. to 271.324 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98848 ( -0.269798 0.295823 )
Norm@50keV : 3.23031E-04 ( -6.18385e-05 5.92076e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.69 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 57 degrees of freedom
# Null hypothesis probability = 3.120807e-01
Photon flux (15-150 keV) in 274.4 sec: 4.81997E-02 ( -0.00654636 0.00654639 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.16927e-07 ( -1.42761e-07 1.47935e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.072 sec. to 271.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03088 ( )
Epeak [keV] : 30.4379 ( )
Norm@50keV : 3.05061E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.68 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 56 degrees of freedom
# Null hypothesis probability = 2.803098e-01
Photon flux (15-150 keV) in 274.4 sec: 4.81898E-02 ( -0.0065529 0.0065349 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.17097e-07 ( -1.52819e-07 1.45684e-07 ) ergs/cm2
Band function
Time interval is from -3.072 sec. to 271.324 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -5.35151 ( 5.0587 5.35151 )
beta : -1.98855 ( -0.295754 0.269961 )
Epeak [keV] : 9999.35 ( -9999.35 -9999.35 )
Norm@50keV : 4.39031E-02 ( -0.00840334 0.00804854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.69 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 55 degrees of freedom
# Null hypothesis probability = 2.492588e-01
Photon flux (15-150 keV) in 274.4 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] : 9.88398 (-1.92345 2.43791)
R^2/D10^2 : 2.24154E-02 (-0.0222205 0.0284275)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.34 using 59 PHA bins.
# Reduced chi-squared = 1.445 for 57 degrees of freedom
# Null hypothesis probability = 1.567953e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.219e-07 3.344e-08
25- 50 2.981e-07 7.874e-08
50-150 1.504e-07 6.081e-08
15-150 5.703e-07 1.142e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 73.0437 (-27.8168 60.5603)
Norm : 0.231462 (-0.045399 0.0616657)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.48 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 57 degrees of freedom
# Null hypothesis probability = 2.588056e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.636e-07 3.082e-08
25- 50 2.633e-07 4.404e-08
50-150 3.489e-07 1.900e-07
15-150 7.758e-07 2.441e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.99307 (-1.26024 1.68339)
R1^2/D10^2 : 0.626591 (-0.489295 1.61656)
kT2 [keV] : 18.4103 (-4.82422 7.86472)
R2^2/D10^2 : 1.84333E-03 (-0.00134294 0.00395711)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.06 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 55 degrees of freedom
# Null hypothesis probability = 2.975901e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.891e-07 1.012e-07
25- 50 2.159e-07 9.734e-08
50-150 3.971e-07 2.420e-07
15-150 8.021e-07 3.551e-07
Peak spectrum fit
Power-law model
Time interval is from 1.556 sec. to 2.556 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98421 ( -0.381746 0.430172 )
Norm@50keV : 3.47483E-03 ( -0.00102215 0.000984708 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.41 using 59 PHA bins.
# Reduced chi-squared = 0.9721 for 57 degrees of freedom
# Null hypothesis probability = 5.348704e-01
Photon flux (15-150 keV) in 1 sec: 0.517476 ( -0.109839 0.109881 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.20193e-08 ( -8.56748e-09 9.09864e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.556 sec. to 2.556 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.910027 ( -4.95246 1.23126 )
Epeak [keV] : 36.3532 ( )
Norm@50keV : 1.67900E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.77 using 59 PHA bins.
# Reduced chi-squared = 0.9780 for 56 degrees of freedom
# Null hypothesis probability = 5.216351e-01
Photon flux (15-150 keV) in 1 sec: 0.498361 ( -0.117373 0.117641 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.73097e-08 ( -9.2355e-09 1.26124e-08 ) ergs/cm2
Band function
Time interval is from 1.556 sec. to 2.556 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.934189 ( -2.54686 2.17707 )
beta : -10.00000 ( 10 4.79616e-14 )
Epeak [keV] : 36.4756 ( -13.8355 -36.4756 )
Norm@50keV : 1.61707E-02 ( -0.00340455 37.5643 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.77 using 59 PHA bins.
# Reduced chi-squared = 0.9958 for 55 degrees of freedom
# Null hypothesis probability = 4.834651e-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] : 8.48930 (-1.6462 2.12794)
R^2/D10^2 : 0.467631 (-0.273077 0.611582)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.58 using 59 PHA bins.
# Reduced chi-squared = 0.9752 for 57 degrees of freedom
# Null hypothesis probability = 5.283125e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.346e-09 2.945e-09
25- 50 1.228e-08 4.716e-09
50-150 3.906e-09 2.551e-09
15-150 2.253e-08 8.444e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 58.6109 (-27.5041 84.6066)
Norm : 2.75983 (-0.831972 1.29192)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.81 using 59 PHA bins.
# Reduced chi-squared = 0.9615 for 57 degrees of freedom
# Null hypothesis probability = 5.578650e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.909e-09 2.266e-09
25- 50 1.044e-08 3.976e-09
50-150 1.165e-08 7.940e-09
15-150 2.900e-08 1.418e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.58704 (-5.16315 2.15556)
R1^2/D10^2 : 0.661919 (-0.401839 14.5822)
kT2 [keV] : 53.5877 (-54.1086 -54.1087)
R2^2/D10^2 : 4.16429E-04 (-0.000402161 0.280692)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.69 using 59 PHA bins.
# Reduced chi-squared = 0.9579 for 55 degrees of freedom
# Null hypothesis probability = 5.635126e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.728e-09 3.870e-09
25- 50 1.143e-08 6.760e-09
50-150 1.415e-08 7.190e-09
15-150 3.230e-08 1.513e-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: 1.44860 ( -0.202147 0.20401 )
Norm@50keV : 1.36084E-03 ( -0.000163018 0.000161644 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.40 using 59 PHA bins.
# Reduced chi-squared = 1.060 for 57 degrees of freedom
# Null hypothesis probability = 3.539037e-01
Photon flux (15-150 keV) in 30.7 sec: 0.167647 ( -0.0193861 0.0194004 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.99886e-07 ( -5.32986e-08 5.41428e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14176 ( -0.80719 0.47907 )
Epeak [keV] : 137.300 ( -137.302 -137.302 )
Norm@50keV : 1.95845E-03 ( -0.000739505 0.002983 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.85 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 56 degrees of freedom
# Null hypothesis probability = 3.379022e-01
Photon flux (15-150 keV) in 30.7 sec: 0.165420 ( -0.020049 0.020017 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.89522e-07 ( -5.8591e-08 5.83945e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.15949 ( -0.33207 0.824185 )
beta : -9.37144 ( 9.37166 19.3717 )
Epeak [keV] : 144.528 ( -80.6357 -144.407 )
Norm@50keV : 1.91308E-03 ( -0.000692025 0.00135261 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.85 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Null hypothesis probability = 3.040813e-01
Photon flux (15-150 keV) in 30.7 sec: 0.165341 ( ) 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) = 2.45e-07
S(50-100 keV) = 2.47e-07
T90 vs. Hardness ratio plot
T90 = 264.615999937057 sec.
Hardness ratio (energy fluence ratio) = 1.00816
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.884798
Count Ratio (50-100 keV) / (15-25 keV) = 0.584402
Mask shadow pattern
IMX = -9.515336926551408E-02, IMY = 1.796321127300071E-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:
-239.072000 -3.072000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5613 35.2005 1.5 38.0 137.7 2.5818 7.5 1.4 Cyg X-1
308.0910 40.9663 1.5 29.3 134.6 1.8140 7.8 1.2 Cyg X-3
326.2885 38.2109 3.5 24.0 104.7 0.6756 3.3 8.6 Cyg X-2
341.3589 18.3029 2.9 40.7 71.4 2.7315 4.0 ------ UNKNOWN
340.7896 24.0016 2.7 35.0 72.8 1.5306 4.3 ------ UNKNOWN
51.5190 70.2365 2.3 28.8 -74.5 1.0960 5.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-3.072000 27.628600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.4579 35.1956 5.5 38.0 137.8 -0.2294 -2.1 6.5 Cyg X-1
308.2700 41.0955 0.0 29.1 134.6 -0.0958 -1.4 11.2 Cyg X-3
326.3728 38.4430 0.0 23.8 104.8 -0.0845 -1.2 11.9 Cyg X-2
33.1799 27.1680 2.8 45.6 -1.8 0.3697 4.1 ------ UNKNOWN
343.2186 70.3083 0.9 11.5 -117.9 0.6522 12.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
62.628600 962.978000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4171 35.2852 8.1 56.7 179.1 3.2675 1.4 4.0 Her X-1
299.5606 35.2177 1.9 42.1 134.1 8.4421 6.1 1.7 Cyg X-1
308.1114 40.9123 1.4 34.5 127.1 6.4473 8.4 2.4 Cyg X-3
325.9982 38.4722 0.0 33.1 101.9 -0.4830 -0.5 12.2 Cyg X-2
353.9713 61.6452 2.4 9.6 45.2 1.6972 4.7 ------ UNKNOWN
250.0812 38.0629 3.3 55.6 -175.7 5.7308 3.5 ------ UNKNOWN
242.0171 37.4319 3.1 58.7 -169.1 9.5430 3.8 ------ UNKNOWN
201.8255 58.8483 2.2 48.0 -129.0 10.3092 5.2 ------ UNKNOWN
Plot creation:
Sat May 30 21:41:08 EDT 2015