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
310.4417 -68.5849 0.0141 36.2066 -58.8916 2.0917704 13.628 TRIG_00509543
Foreground time interval of the image:
-5.768 47.149 (delta_t = 52.917 [sec])
Background time interval of the image:
-239.752 -5.768 (delta_t = 233.984 [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 8.192000
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 8.192000
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 8.192000
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 -5.768 sec. to 62.648 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62767 ( -0.183353 0.18673 )
Norm@50keV : 2.17482E-03 ( -0.000246178 0.000244095 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.05 using 59 PHA bins.
# Reduced chi-squared = 0.9658 for 57 degrees of freedom
# Null hypothesis probability = 5.486172e-01
Photon flux (15-150 keV) in 68.42 sec: 0.281922 ( -0.030986 0.0310454 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38716e-06 ( -1.66031e-07 1.67762e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.768 sec. to 62.648 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.877180 ( -0.996054 0.79653 )
Epeak [keV] : 71.0926 ( -18.8476 -71.0947 )
Norm@50keV : 5.39299E-03 ( -0.00327642 0.0125144 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.51 using 59 PHA bins.
# Reduced chi-squared = 0.9377 for 56 degrees of freedom
# Null hypothesis probability = 6.077860e-01
Photon flux (15-150 keV) in 68.42 sec: 0.273197 ( -0.03253 0.032458 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30669e-06 ( -1.87888e-07 1.89599e-07 ) ergs/cm2
Band function
Time interval is from -5.768 sec. to 62.648 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.464359 ( -1.3961 5.43812 )
beta : -2.08419 ( 2.08807 0.493119 )
Epeak [keV] : 56.3094 ( -34.5273 142.424 )
Norm@50keV : 9.66172E-03 ( -0.00632384 31.2135 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.74 using 59 PHA bins.
# Reduced chi-squared = 0.9407 for 55 degrees of freedom
# Null hypothesis probability = 6.000369e-01
Photon flux (15-150 keV) in 68.42 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31742e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.1639 (-1.55606 1.8177)
R^2/D10^2 : 5.04172E-02 (-0.0190683 0.029501)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.05 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 57 degrees of freedom
# Null hypothesis probability = 2.430316e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.267e-07 2.819e-08
25- 50 4.424e-07 6.418e-08
50-150 4.883e-07 1.184e-07
15-150 1.057e-06 1.516e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 151.594 (-56.4796 -151.389)
Norm : 1.17156 (-0.140542 0.163748)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.08 using 59 PHA bins.
# Reduced chi-squared = 0.9313 for 57 degrees of freedom
# Null hypothesis probability = 6.227699e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.057e-07 3.989e-08
25- 50 3.818e-07 1.616e-07
50-150 7.570e-07 3.986e-07
15-150 1.345e-06 6.590e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.26827 ( )
R1^2/D10^2 : 0.134814 (-0.0722263 0.357384)
kT2 [keV] : 33.1179 (-15.1234 -32.5133)
R2^2/D10^2 : 1.11019E-03 (-0.00120022 0.013184)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.41 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.06 using 59 PHA bins.
# Reduced chi-squared = 0.9892 for 55 degrees of freedom
# Reduced chi-squared = 0.9466 for 55 degrees of freedom
# Null hypothesis probability = 4.972824e-01
# Null hypothesis probability = 5.875069e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.730e-07 1.048e-07
25- 50 3.862e-07 2.072e-07
50-150 6.208e-07 3.671e-07
15-150 1.180e-06 6.373e-07
Peak spectrum fit
Power-law model
Time interval is from 4.764 sec. to 5.764 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68945 ( -0.559221 0.590093 )
Norm@50keV : 6.22025E-03 ( -0.00216004 0.00206579 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.85 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 57 degrees of freedom
# Null hypothesis probability = 1.974067e-01
Photon flux (15-150 keV) in 1 sec: 0.823098 ( -0.259166 0.260001 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.76414e-08 ( -2.01148e-08 2.08644e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.764 sec. to 5.764 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65793 ( -2.43791 0.722911 )
Epeak [keV] : 493.586 ( )
Norm@50keV : 6.47348E-03 ( -0.00648641 0.226083 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.84 using 59 PHA bins.
# Reduced chi-squared = 1.176 for 56 degrees of freedom
# Null hypothesis probability = 1.728682e-01
Photon flux (15-150 keV) in 1 sec: 0.821689 ( -0.261446 0.260691 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.70605e-08 ( -2.22656e-08 2.13282e-08 ) ergs/cm2
Band function
Time interval is from 4.764 sec. to 5.764 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96462 ( -4.96462 -4.96462 )
beta : -1.94924 ( -1.24727 0.701446 )
Epeak [keV] : 26.5734 ( -26.5734 62.6401 )
Norm@50keV : 534.319 ( -163.582 7.71932e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.11 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 55 degrees of freedom
# Null hypothesis probability = 1.651555e-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] : 10.4753 (-3.67986 8.64855)
R^2/D10^2 : 0.320908 (-0.316019 1.33411)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.35 using 59 PHA bins.
# Reduced chi-squared = 1.217 for 57 degrees of freedom
# Null hypothesis probability = 1.264426e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.274e-09 4.489e-09
25- 50 1.929e-08 1.238e-08
50-150 1.149e-08 8.365e-09
15-150 3.805e-08 2.355e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 161.749 (-157.209 -157.209)
Norm : 3.29226 (-1.08145 2.13579)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.98 using 59 PHA bins.
# Reduced chi-squared = 1.158 for 57 degrees of freedom
# Null hypothesis probability = 1.942739e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.398e-09 5.220e-09
25- 50 1.573e-08 9.250e-09
50-150 3.201e-08 2.032e-08
15-150 5.614e-08 3.457e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.89447 (-3.06259 4.61136)
R1^2/D10^2 : 1.23020 (-1.04442 10.1587)
kT2 [keV] : 33.8116 (-19.7636 -33.7099)
R2^2/D10^2 : 3.87915E-03 (-0.00387957 0.0844751)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.75 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 55 degrees of freedom
# Null hypothesis probability = 1.728845e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.887e-09 6.250e-09
25- 50 1.644e-08 9.250e-09
50-150 3.361e-08 1.957e-08
15-150 5.994e-08 3.288e-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: 1.61599 ( -0.187446 0.190537 )
Norm@50keV : 2.45826E-03 ( -0.000281664 0.000279236 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.93 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 57 degrees of freedom
# Null hypothesis probability = 3.046809e-01
Photon flux (15-150 keV) in 52.92 sec: 0.317482 ( -0.0353838 0.035447 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21433e-06 ( -1.47611e-07 1.49141e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09791 ( -0.90862 0.647214 )
Epeak [keV] : 83.4151 ( -28.4129 -83.417 )
Norm@50keV : 4.59486E-03 ( -0.00233185 0.00899701 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.58 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 56 degrees of freedom
# Null hypothesis probability = 3.140316e-01
Photon flux (15-150 keV) in 52.92 sec: 0.310753 ( -0.036884 0.036787 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16546e-06 ( -1.65777e-07 1.65936e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.317414 ( -1.14677 -1.14677 )
beta : -1.83211 ( 1.83929 0.316333 )
Epeak [keV] : 40.2763 ( -36.2866 27.6924 )
Norm@50keV : 4.16428E-02 ( -0.0418556 52.2332 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.92 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 55 degrees of freedom
# Null hypothesis probability = 3.020294e-01
Photon flux (15-150 keV) in 52.92 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17932e-06 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 3.64e-07
S(50-100 keV) = 4.71e-07
T90 vs. Hardness ratio plot
T90 = 56.3040000200272 sec.
Hardness ratio (energy fluence ratio) = 1.29396
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.75169
Count Ratio (50-100 keV) / (15-25 keV) = 1.16389
Mask shadow pattern
IMX = 3.782290248953952E-01, IMY = 6.267895714224447E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
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:
-239.752000 -5.768000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5362 -40.5629 0.8 42.2 168.4 5.5647 14.4 0.6 Vela X-1
170.3919 -60.6278 1.8 36.0 -145.3 1.6942 6.4 2.3 Cen X-3
186.7725 -62.6251 9.5 38.5 -132.7 0.4009 1.2 9.3 GX 301-2
91.9995 -52.5704 2.7 19.4 121.4 0.8830 4.2 ------ UNKNOWN
18.0342 -36.8426 2.5 45.0 17.4 1.8223 4.7 ------ UNKNOWN
356.7936 -31.1575 2.9 57.2 -0.5 4.7676 4.0 ------ UNKNOWN
190.5762 -51.0674 3.6 49.8 -137.5 2.5570 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-5.768000 47.148600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6372 -40.6321 7.4 42.1 168.6 -0.2361 -1.6 6.8 Vela X-1
170.5531 -60.6784 4.1 36.0 -145.2 -0.3287 -2.8 7.7 Cen X-3
186.2577 -62.6923 6.9 38.3 -133.0 0.2430 1.7 11.9 GX 301-2
310.4417 -68.5849 0.8 36.2 -58.9 2.0921 13.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
239.748610 962.294300
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
70.3934 35.2974 3.0 32.2 90.9 2.9173 3.9 ------ UNKNOWN
46.5450 22.4567 2.7 39.0 132.0 4.3713 4.4 ------ UNKNOWN
95.4736 50.7263 2.3 31.6 45.1 2.9995 5.0 ------ UNKNOWN
36.4537 44.7068 3.3 16.6 150.6 1.3072 3.5 ------ UNKNOWN
36.2596 55.4695 3.0 6.1 162.6 1.4445 3.8 ------ UNKNOWN
24.8437 77.8700 2.4 17.4 -49.2 1.8848 4.9 ------ UNKNOWN
356.1527 11.4217 3.0 59.1 -166.1 10.7074 3.8 ------ UNKNOWN
339.0940 30.3813 4.1 49.9 -137.8 5.7403 2.8 ------ UNKNOWN
267.8779 69.6385 3.2 44.9 -60.0 7.7377 3.6 ------ UNKNOWN
327.9690 44.7895 3.3 43.8 -116.1 6.8935 3.5 ------ UNKNOWN
Plot creation:
Sat May 30 20:53:51 EDT 2015