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
181.9414 -55.7114 0.0144 18.7160 164.4849 1.4880837 13.419 TRIG_00559139
Foreground time interval of the image:
-15.376 48.624 (delta_t = 64.000 [sec])
Background time interval of the image:
-239.376 -15.376 (delta_t = 224.000 [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)
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 -15.376 sec. to 48.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75135 ( -0.180513 0.187857 )
Norm@50keV : 1.39662E-03 ( -0.000166032 0.000163022 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.70 using 59 PHA bins.
# Reduced chi-squared = 0.9773 for 57 degrees of freedom
# Null hypothesis probability = 5.238171e-01
Photon flux (15-150 keV) in 64 sec: 0.188941 ( -0.019065 0.0190683 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.24717e-07 ( -1.00609e-07 1.02772e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.376 sec. to 48.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.901134 ( -0.953638 0.779047 )
Epeak [keV] : 56.9403 ( -12.777 111.748 )
Norm@50keV : 4.13201E-03 ( -0.00256649 0.00979242 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.19 using 59 PHA bins.
# Reduced chi-squared = 0.9320 for 56 degrees of freedom
# Null hypothesis probability = 6.197353e-01
Photon flux (15-150 keV) in 64 sec: 0.182169 ( -0.019968 0.019986 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.57824e-07 ( -1.10598e-07 1.17498e-07 ) ergs/cm2
Band function
Time interval is from -15.376 sec. to 48.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.901434 ( -0.616411 0.764169 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 56.9307 ( -12.6414 112.236 )
Norm@50keV : 4.13048E-03 ( -0.0025653 0.00980764 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.19 using 59 PHA bins.
# Reduced chi-squared = 0.9490 for 55 degrees of freedom
# Null hypothesis probability = 5.825472e-01
Photon flux (15-150 keV) in 64 sec: 0.182916 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.57286e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.7231 (-1.32606 1.51819)
R^2/D10^2 : 5.03077E-02 (-0.0181567 0.0278495)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.96 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 57 degrees of freedom
# Null hypothesis probability = 2.191546e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.338e-08 1.696e-08
25- 50 2.858e-07 3.600e-08
50-150 2.324e-07 5.830e-08
15-150 6.116e-07 8.838e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9143 (-28.8871 71.587)
Norm : 0.838816 (-0.114685 0.120382)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.86 using 59 PHA bins.
# Reduced chi-squared = 0.9273 for 57 degrees of freedom
# Null hypothesis probability = 6.311465e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.403e-07 2.022e-08
25- 50 2.426e-07 3.149e-08
50-150 3.929e-07 1.714e-07
15-150 7.758e-07 1.795e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.40143 (-3.34881 3.60674)
R1^2/D10^2 : 0.441311 (-0.339864 56.2899)
kT2 [keV] : 16.8309 (-4.3355 13.6086)
R2^2/D10^2 : 1.06248E-02 (-0.00961106 0.0263473)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.98 using 59 PHA bins.
# Reduced chi-squared = 0.9632 for 55 degrees of freedom
# Null hypothesis probability = 5.523718e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.320e-07 7.129e-08
25- 50 2.455e-07 1.257e-07
50-150 3.523e-07 1.981e-07
15-150 7.298e-07 3.717e-07
Peak spectrum fit
Power-law model
Time interval is from 8.124 sec. to 9.124 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.16263 ( -0.946296 1.35068 )
Norm@50keV : 2.13889E-03 ( -0.00213834 0.00143057 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.83 using 59 PHA bins.
# Reduced chi-squared = 1.330 for 57 degrees of freedom
# Null hypothesis probability = 4.840610e-02
Photon flux (15-150 keV) in 1 sec: 0.347287 ( -0.149146 0.149021 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00074e-08 ( -1.11936e-08 1.32772e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.124 sec. to 9.124 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19714 ( )
Epeak [keV] : 78.8416 ( )
Norm@50keV : 1.71671E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.58 using 59 PHA bins.
# Reduced chi-squared = 1.350 for 56 degrees of freedom
# Null hypothesis probability = 4.168662e-02
Photon flux (15-150 keV) in 1 sec: 0.346652 ( -0.148615 0.146655 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.96362e-08 ( -1.09719e-08 1.32657e-08 ) ergs/cm2
Band function
Time interval is from 8.124 sec. to 9.124 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98647 ( -4.98647 -4.98647 )
beta : -2.24977 ( -2.04194 1.00233 )
Epeak [keV] : 17.5648 ( -17.5648 71.1556 )
Norm@50keV : 4356.79 ( -1833.06 1.14764e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.68 using 59 PHA bins.
# Reduced chi-squared = 1.376 for 55 degrees of freedom
# Null hypothesis probability = 3.366541e-02
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] : 6.84116 (-3.33332 4.83641)
R^2/D10^2 : 0.691723 (-0.691083 11.8347)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.63 using 59 PHA bins.
# Reduced chi-squared = 1.362 for 57 degrees of freedom
# Null hypothesis probability = 3.596991e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.075e-09 3.087e-09
25- 50 6.645e-09 4.515e-09
50-150 1.013e-09 9.365e-10
15-150 1.273e-08 8.715e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 41.3854 (-41.8052 -41.8052)
Norm : 2.14804 (-1.27779 6.81634)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.58 using 59 PHA bins.
# Reduced chi-squared = 1.343 for 57 degrees of freedom
# Null hypothesis probability = 4.283644e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.988e-09 3.255e-09
25- 50 6.658e-09 4.286e-09
50-150 5.344e-09 4.857e-09
15-150 1.699e-08 1.170e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.73 using 59 PHA bins.
#Fit statistic : Chi-Squared = 74.99 using 59 PHA bins.
#Fit statistic : Chi-Squared = 74.70 using 59 PHA bins.
#Fit statistic : Chi-Squared = 74.64 using 59 PHA bins.
# Reduced chi-squared = 1.395 for 55 degrees of freedom
# Reduced chi-squared = 1.363 for 55 degrees of freedom
# Reduced chi-squared = 1.358 for 55 degrees of freedom
# Reduced chi-squared = 1.357 for 55 degrees of freedom
# Null hypothesis probability = 2.802910e-02
# Null hypothesis probability = 3.785942e-02
# Null hypothesis probability = 3.973781e-02
# Null hypothesis probability = 4.017256e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.055e-09 2.705e-09
25- 50 5.979e-09 4.018e-09
50-150 3.098e-09 2.497e-09
15-150 1.413e-08 9.035e-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: 1.75135 ( -0.180513 0.187857 )
Norm@50keV : 1.39662E-03 ( -0.000166032 0.000163022 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.70 using 59 PHA bins.
# Reduced chi-squared = 0.9773 for 57 degrees of freedom
# Null hypothesis probability = 5.238171e-01
Photon flux (15-150 keV) in 64 sec: 0.188941 ( -0.019065 0.0190683 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.24717e-07 ( -1.00609e-07 1.02772e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.901134 ( -0.953638 0.779047 )
Epeak [keV] : 56.9403 ( -12.777 111.748 )
Norm@50keV : 4.13201E-03 ( -0.00256649 0.00979242 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.19 using 59 PHA bins.
# Reduced chi-squared = 0.9320 for 56 degrees of freedom
# Null hypothesis probability = 6.197353e-01
Photon flux (15-150 keV) in 64 sec: 0.182169 ( -0.019968 0.019986 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.57824e-07 ( -1.10598e-07 1.17498e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.901434 ( -0.616411 0.764169 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 56.9307 ( -12.6414 112.236 )
Norm@50keV : 4.13048E-03 ( -0.0025653 0.00980764 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.19 using 59 PHA bins.
# Reduced chi-squared = 0.9490 for 55 degrees of freedom
# Null hypothesis probability = 5.825472e-01
Photon flux (15-150 keV) in 64 sec: 0.182916 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.57286e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 2.28e-07
S(50-100 keV) = 2.71e-07
T90 vs. Hardness ratio plot
T90 = 48 sec.
Hardness ratio (energy fluence ratio) = 1.1886
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.29609
Count Ratio (50-100 keV) / (15-25 keV) = 0.796549
Mask shadow pattern
IMX = -3.264463825353017E-01, IMY = -9.062415982562974E-02
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:
-239.376000 -15.376000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.7538 -40.5787 0.0 37.6 -130.7 -0.6115 -1.7 10.4 Vela X-1
170.3957 -60.4721 5.6 25.0 176.5 0.4343 2.0 9.4 Cen X-3
186.5098 -62.8092 6.6 25.8 157.9 0.4260 1.8 4.7 GX 301-2
162.0372 -63.2984 1.9 29.5 -179.6 1.4262 6.1 ------ UNKNOWN
96.7173 -56.1445 4.1 58.8 -159.3 4.6544 2.8 ------ UNKNOWN
175.7229 19.0834 3.9 56.8 -29.7 3.6408 2.9 ------ UNKNOWN
145.6715 -14.8987 3.7 40.9 -87.5 3.3848 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-15.376000 48.624000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5132 -40.4741 11.3 37.8 -130.6 0.1839 1.0 4.9 Vela X-1
170.2910 -60.5632 27.7 25.1 176.5 0.0502 0.4 3.7 Cen X-3
186.4326 -62.8698 5.5 25.8 158.0 0.2617 2.1 8.6 GX 301-2
231.1228 -82.8988 2.1 48.3 153.2 2.1955 5.4 ------ UNKNOWN
181.9414 -55.7114 0.9 18.7 164.5 1.4880 13.4 ------ UNKNOWN
186.2524 -8.6393 2.1 28.5 -16.1 0.6337 5.4 ------ UNKNOWN
183.1271 12.6562 2.4 49.7 -21.5 1.2029 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
215.124600 898.524610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.2636 35.2942 7.3 46.7 -167.5 1.5522 1.6 9.9 Her X-1
263.0188 -24.7546 26.4 34.9 92.5 -0.5372 -0.4 0.8 GX 1+4
268.4654 -1.4994 3.7 19.4 134.8 1.7147 3.1 6.5 SW J1753.5-0127
270.2281 -25.0934 10.9 30.8 83.1 1.0445 1.1 3.2 GX 5-1
270.3666 -25.8289 4.4 31.3 82.1 2.7328 2.6 6.2 GRS 1758-258
274.0831 -14.0185 2.8 19.9 93.3 2.3067 4.2 4.6 GX 17+2
275.9638 -30.4729 49.9 33.0 69.7 0.2395 0.2 6.7 H1820-303
285.0444 -24.7544 12.2 25.4 56.6 0.5656 0.9 10.0 HT1900.1-2455
288.8075 10.9443 0.8 10.5 -123.8 7.2051 15.0 0.5 GRS 1915+105
299.5558 35.2025 3.1 36.4 -112.9 4.2846 3.7 1.7 Cyg X-1
272.5821 16.6705 2.5 22.0 -171.3 2.3668 4.6 ------ UNKNOWN
244.7311 31.8429 2.3 51.3 -177.2 7.1759 5.0 ------ UNKNOWN
241.3451 41.6600 2.9 58.6 -168.6 11.9842 4.0 ------ UNKNOWN
289.2932 38.8182 3.2 38.3 -127.3 3.0937 3.6 ------ UNKNOWN
345.7728 -11.0288 4.2 58.8 -26.0 10.4132 2.8 ------ UNKNOWN
Plot creation:
Sat May 30 16:13:34 EDT 2015