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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
358.7517 24.8705 0.0178 20.6516 -113.9978 0.7327576 10.794 TRIG_00151131
Foreground time interval of the image:
-7.216 40.084 (delta_t = 47.300 [sec])
Background time interval of the image:
-299.816 -7.216 (delta_t = 292.600 [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 26.880000
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 26.880000
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 26.880000
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 -7.216 sec. to 40.084 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.63682 ( -0.261606 0.29381 )
Norm@50keV : 7.06398E-04 ( -0.000156998 0.000159246 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.07 using 59 PHA bins.
# Reduced chi-squared = 0.8434 for 57 degrees of freedom
# Null hypothesis probability = 7.941485e-01
Photon flux (15-150 keV) in 47.3 sec: 0.151265 ( -0.0183455 0.0183557 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.47962e-07 ( -5.33085e-08 5.58972e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.216 sec. to 40.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.483283 ( -2.05941 1.22838 )
Epeak [keV] : 23.3496 ( -21.7996 6.01869 )
Norm@50keV : 1.84052E-02 ( -0.0184092 0.438274 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.34 using 59 PHA bins.
# Reduced chi-squared = 0.7382 for 56 degrees of freedom
# Null hypothesis probability = 9.284532e-01
Photon flux (15-150 keV) in 47.3 sec: 0.145564 ( -0.018153 0.018267 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.05224e-07 ( -4.54028e-08 5.23833e-08 ) ergs/cm2
Band function
Time interval is from -7.216 sec. to 40.084 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.407099 ( -1.6651 2.01124 )
beta : -9.37167 ( 9.37167 19.3691 )
Epeak [keV] : 23.6759 ( -7.03149 5.27843 )
Norm@50keV : 2.05076E-02 ( -0.0206244 0.649616 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.35 using 59 PHA bins.
# Reduced chi-squared = 0.7518 for 55 degrees of freedom
# Null hypothesis probability = 9.135503e-01
Photon flux (15-150 keV) in 47.3 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] : 6.96928 (-0.824864 0.909207)
R^2/D10^2 : 0.297432 (-0.119412 0.207684)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.21 using 59 PHA bins.
# Reduced chi-squared = 0.7756 for 57 degrees of freedom
# Null hypothesis probability = 8.921431e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.093e-07 2.545e-08
25- 50 1.484e-07 2.495e-08
50-150 2.420e-08 1.148e-08
15-150 2.818e-07 5.250e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.9238 (-6.30904 8.80195)
Norm : 1.35171 (-0.315341 0.441197)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.15 using 59 PHA bins.
# Reduced chi-squared = 0.7396 for 57 degrees of freedom
# Null hypothesis probability = 9.291649e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.226e-07 1.930e-08
25- 50 1.316e-07 2.408e-08
50-150 6.223e-08 2.976e-08
15-150 3.164e-07 5.555e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.98793 (-1.94166 3.61147)
R1^2/D10^2 : 67.7132 (-77.5825 -78.0445)
kT2 [keV] : 7.78881 (-1.18407 3.36476)
R2^2/D10^2 : 0.171164 (-0.157095 0.146661)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.86 using 59 PHA bins.
# Reduced chi-squared = 0.7246 for 55 degrees of freedom
# Null hypothesis probability = 9.379428e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.149e-07 5.162e-08
25- 50 1.460e-07 7.129e-08
50-150 3.491e-08 2.073e-08
15-150 2.958e-07 1.260e-07
Peak spectrum fit
Power-law model
Time interval is from 9.504 sec. to 10.504 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81651 ( -0.609304 0.717126 )
Norm@50keV : 2.84842E-03 ( -0.00115969 0.00101735 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.56 using 59 PHA bins.
# Reduced chi-squared = 0.9922 for 57 degrees of freedom
# Null hypothesis probability = 4.916281e-01
Photon flux (15-150 keV) in 1 sec: 0.395048 ( -0.116891 0.116882 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62073e-08 ( -9.80307e-09 1.02696e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.504 sec. to 10.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.58199 ( )
Epeak [keV] : 194.832 ( )
Norm@50keV : 1.17168E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.34 using 59 PHA bins.
# Reduced chi-squared = 0.9882 for 56 degrees of freedom
# Null hypothesis probability = 4.997689e-01
Photon flux (15-150 keV) in 1 sec: 0.394960 ( -0.116772 0.11676 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.59276e-08 ( -9.5019e-09 1.00989e-08 ) ergs/cm2
Band function
Time interval is from 9.504 sec. to 10.504 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.44382 ( 1.44541 1.44541 )
beta : -1.80581 ( 1.81607 0.608674 )
Epeak [keV] : 16.8537 ( -16.8775 -16.8775 )
Norm@50keV : 7.05172E-03 ( -0.00715023 33.2427 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.56 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 55 degrees of freedom
# Null hypothesis probability = 4.164875e-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] : 9.97515 (-4.15957 7.27245)
R^2/D10^2 : 0.175791 (-0.1715 1.16985)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.84 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 57 degrees of freedom
# Null hypothesis probability = 2.771846e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.559e-09 2.258e-09
25- 50 8.819e-09 5.445e-09
50-150 4.569e-09 3.606e-09
15-150 1.695e-08 1.054e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9291 (-99.9827 -99.9827)
Norm : 1.72028 (-0.621123 1.17444)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.66 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 57 degrees of freedom
# Null hypothesis probability = 4.507715e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.496e-09 2.770e-09
25- 50 7.774e-09 4.770e-09
50-150 1.259e-08 1.016e-08
15-150 2.486e-08 1.691e-08
Double BB
R1^2/D10^2 : 0.692943 ( )
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 6.72938E-05 (-3.81871e-05 0.000370957)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.94 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.89 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.87 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 55 degrees of freedom
# Reduced chi-squared = 1.016 for 55 degrees of freedom
# Reduced chi-squared = 1.016 for 55 degrees of freedom
# Null hypothesis probability = 4.394348e-01
# Null hypothesis probability = 4.411856e-01
# Null hypothesis probability = 4.418169e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.076e-09 3.151e-09
25- 50 6.452e-09 3.883e-09
50-150 1.862e-08 5.050e-09
15-150 3.015e-08 9.090e-09
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: 2.63682 ( -0.261606 0.29381 )
Norm@50keV : 7.06398E-04 ( -0.000156998 0.000159246 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.07 using 59 PHA bins.
# Reduced chi-squared = 0.8434 for 57 degrees of freedom
# Null hypothesis probability = 7.941485e-01
Photon flux (15-150 keV) in 47.3 sec: 0.151265 ( -0.0183455 0.0183557 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.47962e-07 ( -5.33085e-08 5.58972e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.483283 ( -2.05941 1.22838 )
Epeak [keV] : 23.3496 ( -21.7996 6.01869 )
Norm@50keV : 1.84052E-02 ( -0.0184092 0.438274 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.34 using 59 PHA bins.
# Reduced chi-squared = 0.7382 for 56 degrees of freedom
# Null hypothesis probability = 9.284532e-01
Photon flux (15-150 keV) in 47.3 sec: 0.145564 ( -0.018153 0.018267 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.05224e-07 ( -4.54028e-08 5.23833e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.407099 ( -1.6651 2.01124 )
beta : -9.37167 ( 9.37167 19.3691 )
Epeak [keV] : 23.6759 ( -7.03149 5.27843 )
Norm@50keV : 2.05076E-02 ( -0.0206244 0.649616 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.35 using 59 PHA bins.
# Reduced chi-squared = 0.7518 for 55 degrees of freedom
# Null hypothesis probability = 9.135503e-01
Photon flux (15-150 keV) in 47.3 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) = 1.17e-07
S(50-100 keV) = 7.50e-08
T90 vs. Hardness ratio plot
T90 = 37.7159999907017 sec.
Hardness ratio (energy fluence ratio) = 0.641026
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.862733
Count Ratio (50-100 keV) / (15-25 keV) = 0.113433
Mask shadow pattern
IMX = -1.532870115865904E-01, IMY = 3.443242978496762E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 26.880000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 26.880000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 26.880000
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:
-299.816000 -7.216000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5820 35.2055 0.9 55.4 174.2 10.0228 12.5 0.5 Cyg X-1
308.0498 40.8709 10.1 51.7 -175.9 0.5339 1.1 5.6 Cyg X-3
326.1837 38.2959 3.1 39.4 -166.0 0.8597 3.7 1.6 Cyg X-2
347.0113 -13.1931 2.4 19.3 55.6 0.8687 4.9 ------ UNKNOWN
312.3129 22.5361 2.2 40.6 163.1 1.5243 5.2 ------ UNKNOWN
25.9530 -23.7288 3.1 45.3 -3.3 1.1805 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-7.216000 40.084000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5612 35.2099 4.7 55.4 174.2 -0.7579 -2.5 1.5 Cyg X-1
308.1314 40.9392 7.7 51.7 -175.8 0.2357 1.5 1.3 Cyg X-3
326.2988 38.2324 8.8 39.3 -166.0 0.1136 1.3 8.0 Cyg X-2
340.0761 -1.2234 2.1 12.7 101.7 0.3352 5.4 ------ UNKNOWN
30.7329 -33.6243 2.6 54.6 3.7 1.1122 4.4 ------ UNKNOWN
329.3315 21.9454 2.4 26.2 175.0 0.3175 4.8 ------ UNKNOWN
358.7516 24.8705 1.1 20.7 -114.0 0.7326 10.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
125.084590 302.215000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5652 35.1778 2.3 51.5 165.2 2.2156 5.0 1.9 Cyg X-1
308.1363 40.9661 2.3 44.7 172.9 1.1545 5.0 1.4 Cyg X-3
326.2069 38.3354 3.5 30.6 172.9 0.4814 3.3 1.9 Cyg X-2
317.3130 26.9081 3.0 37.2 151.3 0.7545 3.8 ------ UNKNOWN
44.0631 -9.1827 3.2 55.7 -9.3 1.6383 3.6 ------ UNKNOWN
292.6896 65.1683 3.0 57.6 -158.2 2.7539 3.9 ------ UNKNOWN
Plot creation:
Sun May 31 16:00:07 EDT 2015