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
164.6683 -23.4699 0.0069 28.6593 147.1709 5.8734534 28.015 TRIG_00456967
Foreground time interval of the image:
-27.360 12.925 (delta_t = 40.285 [sec])
Background time interval of the image:
-36.875 -27.360 (delta_t = 9.515 [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
Multiple GTIs in the spectrum
tstart tstop
-27.360000 233.744000
235.024000 855.488000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38916 ( -0.0377154 0.0376513 )
Norm@50keV : 2.74202E-03 ( -5.28932e-05 5.28642e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.14 using 59 PHA bins.
# Reduced chi-squared = 0.7217 for 57 degrees of freedom
# Null hypothesis probability = 9.437783e-01
Photon flux (15-150 keV) in 881.6 sec: 0.333114 ( -0.00731786 0.00734325 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.34105e-05 ( -4.64499e-07 4.64844e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-27.360000 233.744000
235.024000 855.488000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25175 ( -0.152262 0.0671156 )
Epeak [keV] : 315.802 ( -134.51 -315.799 )
Norm@50keV : 3.14271E-03 ( -0.000333959 0.000497661 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.62 using 59 PHA bins.
# Reduced chi-squared = 0.6896 for 56 degrees of freedom
# Null hypothesis probability = 9.630203e-01
Photon flux (15-150 keV) in 881.6 sec: 0.329182 ( -0.008323 0.008368 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32177e-05 ( -5.14237e-07 5.12562e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-27.360000 233.744000
235.024000 855.488000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25180 ( 0.91418 5.58834 )
beta : -9.99925 ( 9.92581 19.9258 )
Epeak [keV] : 315.844 ( -88.972 -315.844 )
Norm@50keV : 3.14214E-03 ( -0.000219037 0.00049768 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.62 using 59 PHA bins.
# Reduced chi-squared = 0.7022 for 55 degrees of freedom
# Null hypothesis probability = 9.540726e-01
Photon flux (15-150 keV) in 881.6 sec: 0.327699 ( 6.6723 -0.009558 ) 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] : 18.8494 ( )
R^2/D10^2 : 1.69228E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 543.84 using 59 PHA bins.
# Reduced chi-squared = 9.5411 for 57 degrees of freedom
# Null hypothesis probability = 1.382982e-80
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.045e-06 4.408e-08
25- 50 4.998e-06 1.384e-07
50-150 1.303e-05 4.011e-07
15-150 1.907e-05 4.055e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 1.40299 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 123.27 using 59 PHA bins.
# Reduced chi-squared = 2.1627 for 57 degrees of freedom
# Null hypothesis probability = 8.731755e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.080e-06 6.656e-08
25- 50 5.925e-06 1.283e-07
50-150 1.299e-05 2.953e-07
15-150 2.200e-05 4.849e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.71995 (-0.583771 0.619372)
R1^2/D10^2 : 0.220084 (-0.0508686 0.0707053)
kT2 [keV] : 30.0795 (-1.97784 2.40584)
R2^2/D10^2 : 2.91727E-03 (-0.00067892 0.000787508)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.02 using 59 PHA bins.
# Reduced chi-squared = 0.6912 for 55 degrees of freedom
# Null hypothesis probability = 9.607293e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.397e-06 1.781e-07
25- 50 5.587e-06 2.173e-07
50-150 1.511e-05 6.039e-07
15-150 2.309e-05 8.992e-07
Peak spectrum fit
Power-law model
Time interval is from 646.612 sec. to 647.612 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26216 ( -0.0918341 0.0918243 )
Norm@50keV : 3.19602E-02 ( -0.001688 0.00168611 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.48 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 57 degrees of freedom
# Null hypothesis probability = 4.209157e-01
Photon flux (15-150 keV) in 1 sec: 3.78762 ( -0.201778 0.201896 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.18843e-07 ( -1.9151e-08 1.92516e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 646.612 sec. to 647.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.945692 ( -0.378414 0.343957 )
Epeak [keV] : 175.264 ( -68.2901 -175.264 )
Norm@50keV : 4.55089E-02 ( -0.0140209 0.0230671 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.07 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 56 degrees of freedom
# Null hypothesis probability = 4.720617e-01
Photon flux (15-150 keV) in 1 sec: 3.73465 ( -0.21009 0.20984 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.11906e-07 ( -2.098e-08 2.0854e-08 ) ergs/cm2
Band function
Time interval is from 646.612 sec. to 647.612 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.938680 ( 0.938462 0.9031 )
beta : -1.65700 ( 1.67076 0.449145 )
Epeak [keV] : 170.822 ( -170.069 -170.069 )
Norm@50keV : 4.59758E-02 ( -0.0127067 0.854199 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.06 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 55 degrees of freedom
# Null hypothesis probability = 4.349280e-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] : 17.6157 ( )
R^2/D10^2 : 0.260297 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 122.98 using 59 PHA bins.
# Reduced chi-squared = 2.1576 for 57 degrees of freedom
# Null hypothesis probability = 9.477127e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.628e-08 1.620e-09
25- 50 7.408e-08 5.715e-09
50-150 1.659e-07 1.710e-08
15-150 2.562e-07 1.750e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 15.5297 (-0.824721 0.824664)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.58 using 59 PHA bins.
# Reduced chi-squared = 1.449 for 57 degrees of freedom
# Null hypothesis probability = 1.500910e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.867e-08 2.245e-09
25- 50 7.438e-08 5.060e-09
50-150 1.631e-07 1.100e-08
15-150 2.762e-07 3.160e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.91888 (-1.39772 1.75509)
R1^2/D10^2 : 3.19799 (-1.61336 3.79472)
kT2 [keV] : 27.0510 (-3.83884 6.36869)
R2^2/D10^2 : 5.30773E-02 (-0.02752 0.0381072)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.55 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 55 degrees of freedom
# Null hypothesis probability = 4.170507e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.075e-08 7.425e-09
25- 50 7.061e-08 1.392e-08
50-150 2.087e-07 3.695e-08
15-150 3.100e-07 5.075e-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: 1.29292 ( -0.0605324 0.0603066 )
Norm@50keV : 9.37433E-03 ( -0.00030218 0.000302106 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.04 using 59 PHA bins.
# Reduced chi-squared = 0.9481 for 57 degrees of freedom
# Null hypothesis probability = 5.867140e-01
Photon flux (15-150 keV) in 40.28 sec: 1.11694 ( -0.0387146 0.0388406 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.73783e-06 ( -1.29262e-07 1.2963e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21923 ( -0.237413 0.0719043 )
Epeak [keV] : 550.673 ( -760.136 -964.194 )
Norm@50keV : 1.01224E-02 ( -0.00065967 0.00255915 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.13 using 59 PHA bins.
# Reduced chi-squared = 0.9667 for 56 degrees of freedom
# Null hypothesis probability = 5.457811e-01
Photon flux (15-150 keV) in 40.28 sec: 1.11607 ( -0.04478 0.0394 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7271e-06 ( -1.36179e-07 6.94186e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.498673 ( 0.806777 0.806777 )
beta : -1.32859 ( -0.102243 0.080926 )
Epeak [keV] : 60.0872 ( -59.7636 271.224 )
Norm@50keV : 3.05566E-02 ( -0.0312671 523.482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.59 using 59 PHA bins.
# Reduced chi-squared = 0.9562 for 55 degrees of freedom
# Null hypothesis probability = 5.671607e-01
Photon flux (15-150 keV) in 40.28 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) = 5.47e-06
S(50-100 keV) = 8.36e-06
T90 vs. Hardness ratio plot
T90 = 810.471999943256 sec.
Hardness ratio (energy fluence ratio) = 1.52834
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.41569
Count Ratio (50-100 keV) / (15-25 keV) = 1.18106
Mask shadow pattern
IMX = -4.592707663994564E-01, IMY = -2.963102109446565E-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:
-36.875410 -27.360000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.3939 -40.5401 5.9 47.6 -173.9 -0.1258 -1.9 6.2 Vela X-1
187.5270 6.3924 2.3 32.5 69.6 0.3200 5.0 ------ UNKNOWN
175.0257 14.6479 2.5 22.6 45.4 0.1740 4.6 ------ UNKNOWN
168.5738 34.9461 2.2 33.8 6.2 0.2213 5.2 ------ UNKNOWN
115.4555 19.5574 2.4 41.7 -78.3 0.6203 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-27.360000 12.924600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4067 -40.5104 4.0 47.6 -173.9 0.8632 2.9 6.2 Vela X-1
190.0436 0.8073 2.3 35.1 79.6 1.9783 5.1 ------ UNKNOWN
164.6683 -23.4699 0.4 28.7 147.2 5.8732 28.0 ------ UNKNOWN
170.0483 34.0713 2.4 33.5 8.8 0.9487 4.8 ------ UNKNOWN
158.0200 15.2050 2.0 12.0 -0.0 0.8513 5.7 ------ UNKNOWN
133.8211 -41.9418 2.1 49.4 -173.4 1.8449 5.5 ------ UNKNOWN
148.6812 32.4947 2.8 29.5 -25.0 0.7091 4.2 ------ UNKNOWN
117.9939 -41.2975 2.4 56.1 -161.1 2.9372 4.7 ------ UNKNOWN
114.2589 -41.2543 2.2 58.2 -158.9 4.6951 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
68.924600 233.744000
235.024000 1285.694000
1287.024000 1548.096500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5647 -40.5695 0.9 29.8 -167.7 11.7935 12.4 1.9 Vela X-1
170.3688 -60.6139 1.8 37.3 139.6 11.8388 6.4 1.7 Cen X-3
186.7993 -62.7497 6.0 42.0 129.3 6.4736 1.9 4.1 GX 301-2
187.6919 -57.1223 3.4 37.5 123.9 7.8697 3.4 ------ UNKNOWN
204.8978 -13.1763 2.6 39.4 46.4 9.5855 4.4 ------ UNKNOWN
175.6448 -41.7341 3.0 20.4 120.2 3.9572 3.8 ------ UNKNOWN
193.7043 4.5495 3.6 39.9 13.3 4.6763 3.2 ------ UNKNOWN
154.5777 -39.6382 2.7 18.3 169.7 3.9454 4.2 ------ UNKNOWN
197.2291 21.8431 3.2 55.3 1.7 14.5867 3.6 ------ UNKNOWN
164.6585 -23.4562 0.4 0.0 -2.5 25.1609 26.0 ------ UNKNOWN
110.8739 -30.5827 2.7 48.0 -146.5 8.3652 4.3 ------ UNKNOWN
102.7020 -28.5964 6.7 55.3 -145.2 12.4943 1.7 ------ UNKNOWN
112.6008 -18.6085 3.0 48.6 -130.3 16.6039 3.9 ------ UNKNOWN
Plot creation:
Sat May 30 22:02:29 EDT 2015