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
170.0471 -57.5378 0.0123 14.2408 -131.4742 0.5193268 15.620 TRIG_00566561
Foreground time interval of the image:
-3.736 7.668 (delta_t = 11.404 [sec])
Background time interval of the image:
-191.403 -3.736 (delta_t = 187.667 [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)
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 -3.736 sec. to 7.668 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82701 ( -0.167631 0.174613 )
Norm@50keV : 2.73453E-03 ( -0.00031649 0.000311746 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.25 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 57 degrees of freedom
# Null hypothesis probability = 1.879386e-01
Photon flux (15-150 keV) in 11.4 sec: 0.380830 ( -0.0368098 0.0368161 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.86765e-07 ( -3.31912e-08 3.38867e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.736 sec. to 7.668 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.343086 ( -1.10254 0.875273 )
Epeak [keV] : 46.2423 ( -6.87586 12.818 )
Norm@50keV : 1.95787E-02 ( -0.0196853 0.0674142 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.66 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 56 degrees of freedom
# Null hypothesis probability = 4.501904e-01
Photon flux (15-150 keV) in 11.4 sec: 0.360854 ( -0.037927 0.038214 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.48283e-07 ( -3.42912e-08 3.78799e-08 ) ergs/cm2
Band function
Time interval is from -3.736 sec. to 7.668 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.345455 ( -0.839601 0.948498 )
beta : -2.53262 ( 9.37167 19.3717 )
Epeak [keV] : 39.7987 ( -7.10174 12.1587 )
Norm@50keV : 5.81996E-02 ( -0.0598238 57.4207 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.30 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 55 degrees of freedom
# Null hypothesis probability = 4.259971e-01
Photon flux (15-150 keV) in 11.4 sec: 0.364017 ( 6.63598 -0.037752 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50898e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.7551 (-1.07444 1.2134)
R^2/D10^2 : 0.141574 (-0.0469065 0.0685468)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.77 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 57 degrees of freedom
# Null hypothesis probability = 2.507246e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.882e-08 5.951e-09
25- 50 1.066e-07 1.313e-08
50-150 6.843e-08 1.739e-08
15-150 2.139e-07 2.673e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 83.6302 (-22.7547 39.2561)
Norm : 1.78230 (-0.229784 0.28015)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.94 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 57 degrees of freedom
# Null hypothesis probability = 3.696325e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.286e-08 7.741e-09
25- 50 8.793e-08 1.016e-08
50-150 1.278e-07 5.983e-08
15-150 2.686e-07 5.523e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.35948 (-3.1868 2.5971)
R1^2/D10^2 : 0.367255 (-0.201424 1.43352)
kT2 [keV] : 18.3801 (-14.2103 38.1619)
R2^2/D10^2 : 1.10121E-02 (-0.0108117 0.0657994)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.06 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 55 degrees of freedom
# Null hypothesis probability = 4.349257e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.669e-08 2.336e-08
25- 50 9.724e-08 4.929e-08
50-150 1.090e-07 6.276e-08
15-150 2.530e-07 1.240e-07
Peak spectrum fit
Power-law model
Time interval is from 0.168 sec. to 1.168 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66713 ( -0.201261 0.207387 )
Norm@50keV : 7.66239E-03 ( -0.00109494 0.00108163 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.14 using 59 PHA bins.
# Reduced chi-squared = 0.8972 for 57 degrees of freedom
# Null hypothesis probability = 6.934386e-01
Photon flux (15-150 keV) in 1 sec: 1.00624 ( -0.128143 0.12816 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.11559e-08 ( -1.06307e-08 1.08701e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.168 sec. to 1.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.225291 ( -1.37127 1.06016 )
Epeak [keV] : 48.8742 ( -7.91196 14.8457 )
Norm@50keV : 9.52060E-02 ( -0.0952072 0.518325 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.21 using 59 PHA bins.
# Reduced chi-squared = 0.7181 for 56 degrees of freedom
# Null hypothesis probability = 9.447822e-01
Photon flux (15-150 keV) in 1 sec: 0.959794 ( -0.127671 0.128626 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.00595e-08 ( -1.01353e-08 1.13729e-08 ) ergs/cm2
Band function
Time interval is from 0.168 sec. to 1.168 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.225419 ( -0.597555 1.10564 )
beta : -10.00000 ( 10 4.10193e-06 )
Epeak [keV] : 48.8638 ( -7.49676 14.8415 )
Norm@50keV : 9.52434E-02 ( -0.0117421 0.520188 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.21 using 59 PHA bins.
# Reduced chi-squared = 0.7311 for 55 degrees of freedom
# Null hypothesis probability = 9.326422e-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] : 11.5579 (-1.46234 1.71042)
R^2/D10^2 : 0.302418 (-0.121109 0.19513)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.08 using 59 PHA bins.
# Reduced chi-squared = 0.7557 for 57 degrees of freedom
# Null hypothesis probability = 9.138413e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.510e-09 1.930e-09
25- 50 2.560e-08 4.300e-09
50-150 2.004e-08 6.035e-09
15-150 5.415e-08 9.175e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 114.632 (-42.0308 -113.041)
Norm : 4.37510 (-0.644878 0.809553)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.21 using 59 PHA bins.
# Reduced chi-squared = 0.8107 for 57 degrees of freedom
# Null hypothesis probability = 8.458521e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.141e-08 2.049e-09
25- 50 2.025e-08 4.610e-09
50-150 3.533e-08 1.965e-08
15-150 6.700e-08 2.821e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.56588 (-3.36866 -7.6669)
R1^2/D10^2 : 0.777377 (-0.550263 2.32332)
kT2 [keV] : 17.5564 (-17.7863 -17.7871)
R2^2/D10^2 : 4.06019E-02 (-0.0386086 0.205968)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.06 using 59 PHA bins.
# Reduced chi-squared = 0.7102 for 55 degrees of freedom
# Null hypothesis probability = 9.486897e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.022e-08 6.105e-09
25- 50 2.365e-08 1.265e-08
50-150 2.812e-08 1.554e-08
15-150 6.200e-08 3.216e-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: 1.82701 ( -0.167631 0.174613 )
Norm@50keV : 2.73453E-03 ( -0.00031649 0.000311746 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.25 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 57 degrees of freedom
# Null hypothesis probability = 1.879386e-01
Photon flux (15-150 keV) in 11.4 sec: 0.380830 ( -0.0368098 0.0368161 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.86765e-07 ( -3.31912e-08 3.38867e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.343086 ( -1.10254 0.875273 )
Epeak [keV] : 46.2423 ( -6.87586 12.818 )
Norm@50keV : 1.95787E-02 ( -0.0196853 0.0674142 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.66 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 56 degrees of freedom
# Null hypothesis probability = 4.501904e-01
Photon flux (15-150 keV) in 11.4 sec: 0.360854 ( -0.037927 0.038214 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.48283e-07 ( -3.42912e-08 3.78799e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.345455 ( -0.839601 0.948498 )
beta : -2.53262 ( 9.37167 19.3717 )
Epeak [keV] : 39.7987 ( -7.10174 12.1587 )
Norm@50keV : 5.81996E-02 ( -0.0598238 57.3992 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.30 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 55 degrees of freedom
# Null hypothesis probability = 4.259971e-01
Photon flux (15-150 keV) in 11.4 sec: 0.364017 ( 6.63598 -0.037752 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50898e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 8.16e-08
S(50-100 keV) = 9.19e-08
T90 vs. Hardness ratio plot
T90 = 8.67599999904633 sec.
Hardness ratio (energy fluence ratio) = 1.12623
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.32462
Count Ratio (50-100 keV) / (15-25 keV) = 0.591636
Mask shadow pattern
IMX = -1.680850985297974E-01, IMY = 1.901583252465348E-01
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:
-191.403390 -3.736000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5254 -40.5341 1.9 42.0 -127.6 2.2358 6.2 1.2 Vela X-1
170.2179 -60.6388 2.4 13.6 -144.1 0.7673 4.8 3.0 Cen X-3
186.5698 -62.8960 6.3 6.5 -167.5 0.3044 1.8 7.9 GX 301-2
256.1112 -37.7130 0.0 42.7 51.8 0.8673 1.3 9.8 4U 1700-377
256.6072 -36.4086 22.8 44.0 51.0 0.3597 0.5 8.3 GX 349+2
96.0356 -43.5905 3.1 58.8 -159.2 4.2809 3.7 ------ UNKNOWN
108.9182 -45.5759 2.6 51.5 -152.0 2.0840 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-3.736000 7.668000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6201 -40.5451 4.4 42.0 -127.5 0.2204 2.6 4.2 Vela X-1
170.3843 -60.4617 10.1 13.5 -143.3 0.0375 1.1 9.9 Cen X-3
186.6589 -62.9820 0.0 6.5 -168.3 -0.0300 -1.0 12.7 GX 301-2
255.7519 -37.7242 0.0 42.5 51.5 -0.2371 -1.9 13.3 4U 1700-377
256.4225 -36.4049 13.3 43.9 50.8 -0.1272 -0.9 1.3 GX 349+2
165.2777 -66.2933 2.3 16.2 -165.7 0.1750 5.0 ------ UNKNOWN
170.0471 -57.5378 0.7 14.2 -131.5 0.5191 15.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
53.996600 962.628600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5295 -40.5580 0.5 27.8 -132.7 14.8977 21.4 0.2 Vela X-1
170.2891 -60.6877 1.4 3.1 113.3 3.7119 7.9 4.0 Cen X-3
186.7922 -62.9132 7.4 9.8 64.7 0.7420 1.6 9.3 GX 301-2
246.8755 -43.8441 2.6 47.7 43.1 8.4492 4.5 ------ UNKNOWN
206.5598 -32.6169 3.1 35.1 -4.7 2.3620 3.8 ------ UNKNOWN
212.0151 -18.2934 3.6 49.9 -9.3 3.3059 3.2 ------ UNKNOWN
90.9949 -32.4284 2.8 57.5 -165.7 9.4005 4.1 ------ UNKNOWN
202.5565 -15.0719 2.8 49.0 -21.9 4.3918 4.2 ------ UNKNOWN
186.3102 -8.3914 4.3 50.8 -44.4 7.1456 2.7 ------ UNKNOWN
179.1753 -11.0877 3.1 47.0 -53.0 10.4079 3.8 ------ UNKNOWN
147.4923 -19.8866 4.9 41.2 -98.6 6.9112 2.4 ------ UNKNOWN
Plot creation:
Sat May 30 15:51:29 EDT 2015