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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
352.5685 26.8220 0.0209 20.1924 -131.1310 0.2913869 9.189 TRIG_00254532
Foreground time interval of the image:
-0.104 10.013 (delta_t = 10.117 [sec])
Background time interval of the image:
-239.088 -0.104 (delta_t = 238.984 [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 -0.104 sec. to 19.420 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89362 ( -0.19817 0.208411 )
Norm@50keV : 1.83460E-03 ( -0.000255293 0.000249775 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.65 using 59 PHA bins.
# Reduced chi-squared = 0.8536 for 57 degrees of freedom
# Null hypothesis probability = 7.764166e-01
Photon flux (15-150 keV) in 19.52 sec: 0.262574 ( -0.0287583 0.0287585 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.29224e-07 ( -4.44297e-08 4.561e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.104 sec. to 19.420 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22264 ( -1.06656 0.824274 )
Epeak [keV] : 46.6328 ( -30.177 -46.6328 )
Norm@50keV : 4.58651E-03 ( -0.00289626 0.0156073 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.83 using 59 PHA bins.
# Reduced chi-squared = 0.8362 for 56 degrees of freedom
# Null hypothesis probability = 8.037877e-01
Photon flux (15-150 keV) in 19.52 sec: 0.256147 ( -0.029723 0.029794 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.0346e-07 ( -5.11971e-08 5.52767e-08 ) ergs/cm2
Band function
Time interval is from -0.104 sec. to 19.420 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.84171 ( -6.38736 -4.84171 )
beta : -2.14678 ( -0.320175 0.271078 )
Epeak [keV] : 24.8320 ( -3.95494 3.48948 )
Norm@50keV : 228.058 ( -24.7445 1273.67 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.45 using 59 PHA bins.
# Reduced chi-squared = 0.8082 for 55 degrees of freedom
# Null hypothesis probability = 8.446254e-01
Photon flux (15-150 keV) in 19.52 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.14508e-07 ( -3.14372e-07 -4.52825e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.71907 (-1.20917 1.41113)
R^2/D10^2 : 0.138059 (-0.0555766 0.0908583)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.46 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.861542e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.131e-08 9.448e-09
25- 50 1.225e-07 1.607e-08
50-150 5.882e-08 1.801e-08
15-150 2.326e-07 3.225e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 74.6708 (-23.0317 42.1023)
Norm : 1.26701 (-0.200883 0.251858)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.80 using 59 PHA bins.
# Reduced chi-squared = 0.8210 for 57 degrees of freedom
# Null hypothesis probability = 8.304029e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.385e-08 9.584e-09
25- 50 1.033e-07 1.240e-08
50-150 1.391e-07 6.461e-08
15-150 3.062e-07 5.729e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.53481 (-1.87422 1.93098)
R1^2/D10^2 : 0.457808 (-0.259449 0.943929)
kT2 [keV] : 22.0654 (-8.01418 32.7363)
R2^2/D10^2 : 3.97024E-03 (-0.00375257 0.0215419)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.29 using 59 PHA bins.
# Reduced chi-squared = 0.8235 for 55 degrees of freedom
# Null hypothesis probability = 8.217577e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.373e-08 2.538e-08
25- 50 1.047e-07 4.433e-08
50-150 1.431e-07 8.071e-08
15-150 3.115e-07 1.450e-07
Peak spectrum fit
Power-law model
Time interval is from -0.114 sec. to 0.886 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87121 ( -0.22571 0.241359 )
Norm@50keV : 7.39791E-03 ( -0.00122135 0.00119339 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.60 using 59 PHA bins.
# Reduced chi-squared = 1.239 for 57 degrees of freedom
# Null hypothesis probability = 1.063343e-01
Photon flux (15-150 keV) in 1 sec: 1.04894 ( -0.138454 0.138454 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.8013e-08 ( -1.09532e-08 1.12728e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.114 sec. to 0.886 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.143270 ( -1.64879 1.27166 )
Epeak [keV] : 43.6631 ( -7.76174 16.5193 )
Norm@50keV : 7.56864E-02 ( -0.0765797 0.626469 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.77 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 56 degrees of freedom
# Null hypothesis probability = 1.973434e-01
Photon flux (15-150 keV) in 1 sec: 0.996860 ( -0.140533 0.14196 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.84153e-08 ( -1.03252e-08 1.22419e-08 ) ergs/cm2
Band function
Time interval is from -0.114 sec. to 0.886 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.369154 ( -1.06671 0.304382 )
beta : -3.15228 ( 3.38365 1.28044 )
Epeak [keV] : 43.9542 ( -12.7328 13.2197 )
Norm@50keV : 5.62460E-02 ( -0.0507384 139.853 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.61 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 55 degrees of freedom
# Null hypothesis probability = 1.759933e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.99114e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.6798 (-1.34302 1.52808)
R^2/D10^2 : 0.408348 (-0.161669 0.264736)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.50 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 57 degrees of freedom
# Null hypothesis probability = 1.610729e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.668e-09 1.976e-09
25- 50 2.630e-08 4.445e-09
50-150 1.656e-08 5.558e-09
15-150 5.253e-08 9.465e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 76.1445 (-25.6073 50.5812)
Norm : 5.07730 (-0.903871 1.12235)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.98 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 57 degrees of freedom
# Null hypothesis probability = 1.718100e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.313e-08 2.310e-09
25- 50 2.135e-08 3.485e-09
50-150 2.914e-08 1.638e-08
15-150 6.361e-08 1.737e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.13765 (-3.95791 -4.15263)
R1^2/D10^2 : 4.98625 (-4.75355 -4.96388)
kT2 [keV] : 12.4815 (-2.3808 -12.4884)
R2^2/D10^2 : 0.198778 (-0.194056 0.0775024)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.16 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 55 degrees of freedom
# Null hypothesis probability = 1.863018e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.189e-08 6.105e-09
25- 50 2.374e-08 1.264e-08
50-150 2.080e-08 1.205e-08
15-150 5.644e-08 2.998e-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: 1.94994 ( -0.281251 0.309194 )
Norm@50keV : 1.77828E-03 ( -0.000365808 0.000352793 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.26 using 59 PHA bins.
# Reduced chi-squared = 1.250 for 57 degrees of freedom
# Null hypothesis probability = 9.688762e-02
Photon flux (15-150 keV) in 10.12 sec: 0.260786 ( -0.0397194 0.0397206 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65613e-07 ( -3.1773e-08 3.30267e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43120 ( -1.2889 0.823915 )
Epeak [keV] : 46.1480 ( )
Norm@50keV : 3.54482E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.55 using 59 PHA bins.
# Reduced chi-squared = 1.260 for 56 degrees of freedom
# Null hypothesis probability = 9.125258e-02
Photon flux (15-150 keV) in 10.12 sec: 0.256333 ( -0.040434 0.040588 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5744e-07 ( -3.37229e-08 3.65929e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43104 ( -1.72598 1.4421 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 46.1254 ( -23.2734 -46.1254 )
Norm@50keV : 3.54541E-03 ( -0.00194298 0.0163448 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.55 using 59 PHA bins.
# Reduced chi-squared = 1.283 for 55 degrees of freedom
# Null hypothesis probability = 7.712773e-02
Photon flux (15-150 keV) in 10.12 sec: 0.257956 ( 6.74204 -0.042435 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.56435e-07 ( -1.56364e-07 -3.29244e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 9.58e-08
S(50-100 keV) = 1.03e-07
T90 vs. Hardness ratio plot
T90 = 18.4079999923706 sec.
Hardness ratio (energy fluence ratio) = 1.07516
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.10195
Count Ratio (50-100 keV) / (15-25 keV) = 0.514163
Mask shadow pattern
IMX = -2.419172814421541E-01, IMY = 2.770127678884092E-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:
-239.088000 -0.104000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5828 35.1855 0.6 44.7 -48.6 9.8475 19.0 1.0 Cyg X-1
308.1309 41.0245 12.9 35.9 -46.0 0.2495 0.9 4.4 Cyg X-3
326.1929 38.1861 4.8 24.9 -63.8 0.5606 2.4 8.2 Cyg X-2
42.8401 50.4502 3.0 29.4 99.9 1.0168 3.9 ------ UNKNOWN
359.4037 70.2435 2.7 23.7 35.2 0.7956 4.3 ------ UNKNOWN
15.4779 8.8733 2.5 40.4 -172.7 1.1605 4.6 ------ UNKNOWN
7.2973 -0.5303 2.6 47.7 -158.1 1.6653 4.5 439.0 UNKNOWN
8.6740 -5.4397 2.1 52.8 -158.9 2.8615 5.5 ------ UNKNOWN
308.0941 37.6669 1.8 37.5 -50.9 2.0160 6.3 ------ UNKNOWN
357.8252 -8.6962 2.8 55.2 -145.4 4.3965 4.2 537.7 UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.104000 10.012590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.7290 35.0551 9.6 44.6 -48.9 -0.1071 -1.2 11.1 Cyg X-1
308.0131 41.0517 6.2 36.0 -45.8 0.0876 1.9 7.4 Cyg X-3
326.3375 38.4093 5.1 24.7 -63.4 -0.0864 -2.3 9.4 Cyg X-2
352.5685 26.8220 1.3 20.2 -131.1 0.2914 9.2 ------ UNKNOWN
11.6332 1.1824 2.2 46.8 -164.4 0.2881 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
52.412600 435.196900
435.912000 963.029600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5804 35.2042 0.4 45.6 -35.6 33.2921 31.3 0.5 Cyg X-1
308.0968 40.8624 15.1 39.0 -27.1 -0.5102 -0.8 5.4 Cyg X-3
326.0795 38.3210 2.2 24.9 -25.8 2.2329 5.3 4.3 Cyg X-2
24.9585 32.8486 3.5 28.6 100.4 2.2291 3.3 ------ UNKNOWN
18.4903 -25.7780 4.0 58.3 -177.3 10.0224 2.9 ------ UNKNOWN
308.0221 37.6736 1.6 38.8 -32.2 5.2767 7.2 ------ UNKNOWN
Plot creation:
Sun May 31 11:06:14 EDT 2015