Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
55.1955 -17.1350 0.0080 34.3504 178.6801 1.0874325 23.866 TRIG_00192059
Foreground time interval of the image:
-2.924 10.032 (delta_t = 12.956 [sec])
Background time interval of the image:
-299.960 -2.924 (delta_t = 297.036 [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)
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 -2.924 sec. to 10.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68877 ( -0.11121 0.112703 )
Norm@50keV : 5.61429E-03 ( -0.000386295 0.000383814 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.81 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 57 degrees of freedom
# Null hypothesis probability = 3.741043e-01
Photon flux (15-150 keV) in 12.96 sec: 0.742739 ( -0.0487896 0.0488432 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.74298e-07 ( -4.86407e-08 4.89775e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.924 sec. to 10.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05340 ( -0.522716 0.462972 )
Epeak [keV] : 69.8693 ( -14.0444 60.3379 )
Norm@50keV : 1.22066E-02 ( -0.00517871 0.0106881 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.09 using 59 PHA bins.
# Reduced chi-squared = 0.9659 for 56 degrees of freedom
# Null hypothesis probability = 5.475183e-01
Photon flux (15-150 keV) in 12.96 sec: 0.722443 ( -0.050994 0.05096 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.39522e-07 ( -5.46575e-08 5.50476e-08 ) ergs/cm2
Band function
Time interval is from -2.924 sec. to 10.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.357688 ( -1.12704 0.344445 )
beta : -1.94816 ( 1.94666 0.225159 )
Epeak [keV] : 45.3778 ( -19.1069 44.8556 )
Norm@50keV : 3.60051E-02 ( -0.0389763 247.069 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.11 using 59 PHA bins.
# Reduced chi-squared = 0.9657 for 55 degrees of freedom
# Null hypothesis probability = 5.471075e-01
Photon flux (15-150 keV) in 12.96 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.49834e-07 ( -6.49743e-07 -5.17545e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.8230 (-0.983025 1.07556)
R^2/D10^2 : 0.142457 (-0.0364766 0.0485832)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.59 using 59 PHA bins.
# Reduced chi-squared = 1.677 for 57 degrees of freedom
# Null hypothesis probability = 1.037561e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.439e-08 7.122e-09
25- 50 2.185e-07 1.704e-08
50-150 2.253e-07 3.331e-08
15-150 5.082e-07 3.862e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 134.886 (-34.4012 47.4825)
Norm : 3.08389 (-0.23668 0.282066)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.75 using 59 PHA bins.
# Reduced chi-squared = 0.9605 for 57 degrees of freedom
# Null hypothesis probability = 5.599320e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.035e-07 9.934e-09
25- 50 1.887e-07 1.970e-08
50-150 3.558e-07 1.316e-07
15-150 6.480e-07 1.372e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.21217 (-1.57113 1.70993)
R1^2/D10^2 : 0.745628 (-0.353496 0.903074)
kT2 [keV] : 23.2885 (-4.99612 10.5555)
R2^2/D10^2 : 1.14352E-02 (-0.00860953 0.0113197)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.77 using 59 PHA bins.
# Reduced chi-squared = 0.9777 for 55 degrees of freedom
# Null hypothesis probability = 5.215342e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.768e-08 2.611e-08
25- 50 1.998e-07 4.495e-08
50-150 3.425e-07 1.613e-07
15-150 6.400e-07 2.087e-07
Peak spectrum fit
Power-law model
Time interval is from 0.076 sec. to 1.076 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57879 ( -0.214823 0.219988 )
Norm@50keV : 1.05963E-02 ( -0.00142255 0.00140453 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.63 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.153679e-01
Photon flux (15-150 keV) in 1 sec: 1.35288 ( -0.171856 0.171998 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.93636e-08 ( -1.43159e-08 1.45094e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.076 sec. to 1.076 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25074 ( -0.993838 0.527452 )
Epeak [keV] : 108.629 ( -82.6929 -108.65 )
Norm@50keV : 1.58342E-02 ( -0.0158322 0.037015 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.18 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 56 degrees of freedom
# Null hypothesis probability = 3.950229e-01
Photon flux (15-150 keV) in 1 sec: 1.33751 ( -0.17668 0.17617 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.67645e-08 ( -1.60761e-08 1.57515e-08 ) ergs/cm2
Band function
Time interval is from 0.076 sec. to 1.076 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.603743 ( 0.699935 5.60962 )
beta : -1.76997 ( 1.76904 0.362344 )
Epeak [keV] : 52.5089 ( -52.5923 559.187 )
Norm@50keV : 4.16825E-02 ( -0.042923 547.576 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.65 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 55 degrees of freedom
# Null hypothesis probability = 3.775881e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.68093e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.1362 (-1.97752 2.40164)
R^2/D10^2 : 0.242784 (-0.109598 0.192828)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.57 using 59 PHA bins.
# Reduced chi-squared = 1.256 for 57 degrees of freedom
# Null hypothesis probability = 9.269649e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.884e-09 2.069e-09
25- 50 3.094e-08 5.240e-09
50-150 3.396e-08 9.795e-09
15-150 7.378e-08 1.464e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 183.836 (-83.9299 -182.602)
Norm : 5.53456 (-0.714447 0.856759)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.15 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 57 degrees of freedom
# Null hypothesis probability = 4.327200e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.392e-08 7.840e-09
25- 50 2.652e-08 1.441e-08
50-150 5.658e-08 3.137e-08
15-150 9.702e-08 5.335e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.59754 (-3.19457 2.66673)
R1^2/D10^2 : 0.835706 (-0.469765 0.720295)
kT2 [keV] : 36.2461 (-30.9332 -36.3385)
R2^2/D10^2 : 4.88118E-03 (-0.00473141 0.0489086)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.94 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 55 degrees of freedom
# Null hypothesis probability = 3.674851e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.261e-08 6.849e-09
25- 50 2.903e-08 1.424e-08
50-150 5.703e-08 3.004e-08
15-150 9.867e-08 4.521e-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: 1.68877 ( -0.11121 0.112703 )
Norm@50keV : 5.61429E-03 ( -0.000386295 0.000383814 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.81 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 57 degrees of freedom
# Null hypothesis probability = 3.741043e-01
Photon flux (15-150 keV) in 12.96 sec: 0.742739 ( -0.0487896 0.0488432 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.74298e-07 ( -4.86407e-08 4.89775e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05340 ( -0.522716 0.462972 )
Epeak [keV] : 69.8693 ( -14.0444 60.3379 )
Norm@50keV : 1.22066E-02 ( -0.00517871 0.0106881 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.09 using 59 PHA bins.
# Reduced chi-squared = 0.9659 for 56 degrees of freedom
# Null hypothesis probability = 5.475183e-01
Photon flux (15-150 keV) in 12.96 sec: 0.722443 ( -0.050994 0.05096 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.39522e-07 ( -5.46575e-08 5.50476e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.357688 ( -1.12704 0.344445 )
beta : -1.94816 ( 1.94666 0.225159 )
Epeak [keV] : 45.3778 ( -19.1069 44.8556 )
Norm@50keV : 3.60051E-02 ( -0.0389763 247.069 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.11 using 59 PHA bins.
# Reduced chi-squared = 0.9657 for 55 degrees of freedom
# Null hypothesis probability = 5.471075e-01
Photon flux (15-150 keV) in 12.96 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.49834e-07 ( -6.49743e-07 -5.17545e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.82e-07
S(50-100 keV) = 2.25e-07
T90 vs. Hardness ratio plot
T90 = 11.3200000226498 sec.
Hardness ratio (energy fluence ratio) = 1.23626
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.3757
Count Ratio (50-100 keV) / (15-25 keV) = 0.878035
Mask shadow pattern
IMX = -6.832624245448796E-01, IMY = -1.574307026352405E-02
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:
-299.960000 -2.924000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6193 22.0333 0.6 31.7 82.1 11.4833 19.5 1.4 Crab
83.4875 -15.5563 2.4 46.0 139.9 4.5135 4.7 ------ UNKNOWN
49.0711 5.7897 2.5 11.2 -166.4 1.2923 4.6 ------ UNKNOWN
45.9057 -41.6784 3.1 58.7 -169.2 5.2801 3.7 ------ UNKNOWN
32.7019 -28.8093 2.3 48.8 -152.4 2.8944 4.9 ------ UNKNOWN
0.6228 54.9827 2.4 53.7 -26.1 3.8616 4.7 ------ UNKNOWN
5.3909 22.2703 2.8 42.6 -68.4 3.8843 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.924000 10.032000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6345 22.1216 6.2 31.7 81.9 0.1233 1.9 6.4 Crab
55.1947 -17.1353 0.5 34.4 178.7 1.0982 24.1 ------ UNKNOWN
10.4409 68.0626 2.6 57.1 -9.8 0.7382 4.5 ------ UNKNOWN
359.7046 61.5769 2.4 57.0 -19.2 0.6855 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
69.940600 302.111700
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
87.8213 11.2216 2.8 42.9 57.3 4.2017 4.1 ------ UNKNOWN
88.3087 -36.3918 2.3 35.0 136.3 1.9747 5.1 ------ UNKNOWN
67.1089 -44.5274 3.0 29.2 168.8 0.9823 3.9 ------ UNKNOWN
61.7247 -75.2178 2.9 58.2 -175.6 4.9000 4.0 ------ UNKNOWN
31.1880 -42.1362 2.6 32.3 -139.3 1.1396 4.4 ------ UNKNOWN
26.2761 -74.1190 2.3 59.2 -164.8 6.0172 5.0 ------ UNKNOWN
20.1637 -56.9049 2.6 47.6 -148.5 2.0806 4.4 ------ UNKNOWN
Plot creation:
Sun May 31 14:07:08 EDT 2015