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
300.9915 65.4134 0.0036 5.7933 130.7037 2.5913021 52.888 TRIG_00514767
Foreground time interval of the image:
-6.312 12.277 (delta_t = 18.589 [sec])
Background time interval of the image:
-239.424 -6.312 (delta_t = 233.112 [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 -6.312 sec. to 74.460 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.37235 ( -0.088877 0.0908053 )
Norm@50keV : 2.37752E-03 ( -0.000127864 0.000126755 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.42 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 57 degrees of freedom
# Null hypothesis probability = 2.329849e-01
Photon flux (15-150 keV) in 80.77 sec: 0.432888 ( -0.0185742 0.0186542 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.8618e-06 ( -8.00383e-08 8.0527e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.312 sec. to 74.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91044 ( )
Epeak [keV] : 7.80568 ( )
Norm@50keV : 4.38881E-03 ( -0.00100627 0.00413623 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.53 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 56 degrees of freedom
# Null hypothesis probability = 3.484938e-01
Photon flux (15-150 keV) in 80.77 sec: 0.417494 ( -0.021755 0.021853 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75674e-06 ( -1.08159e-07 1.11568e-07 ) ergs/cm2
Band function
Time interval is from -6.312 sec. to 74.460 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17259 ( )
beta : -8.43547 ( )
Epeak [keV] : 60.6453 ( )
Norm@50keV : 5.72489E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 176.82 using 59 PHA bins.
# Reduced chi-squared = 3.2148 for 55 degrees of freedom
# Null hypothesis probability = 1.045968e-14
Photon flux (15-150 keV) in 80.77 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.76075e-06 ( -1.76018e-06 -1.0131e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.82440 ( )
R^2/D10^2 : 0.289422 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 148.20 using 59 PHA bins.
# Reduced chi-squared = 2.6001 for 57 degrees of freedom
# Null hypothesis probability = 4.741274e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.507e-07 2.468e-08
25- 50 7.226e-07 3.025e-08
50-150 2.594e-07 3.146e-08
15-150 1.333e-06 5.815e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 40.9830 (-4.23736 4.96183)
Norm : 2.63798 (-0.234673 0.261922)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.00 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 57 degrees of freedom
# Null hypothesis probability = 2.724818e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.932e-07 2.960e-08
25- 50 6.557e-07 2.843e-08
50-150 5.208e-07 6.167e-08
15-150 1.670e-06 8.158e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.96693 (-0.823768 0.984656)
R1^2/D10^2 : 2.16424 (-1.05611 2.43369)
kT2 [keV] : 14.4580 (-2.12861 3.85785)
R2^2/D10^2 : 2.68069E-02 (-0.0176034 0.0296959)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.95 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 55 degrees of freedom
# Null hypothesis probability = 1.482323e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.092e-07 9.163e-08
25- 50 6.316e-07 9.252e-08
50-150 5.219e-07 1.211e-07
15-150 1.663e-06 2.625e-07
Peak spectrum fit
Power-law model
Time interval is from 5.444 sec. to 6.444 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08890 ( -0.153965 0.160171 )
Norm@50keV : 1.11339E-02 ( -0.00116438 0.00114206 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.85 using 59 PHA bins.
# Reduced chi-squared = 0.8921 for 57 degrees of freedom
# Null hypothesis probability = 7.037504e-01
Photon flux (15-150 keV) in 1 sec: 1.74212 ( -0.139032 0.139087 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03338e-07 ( -9.72776e-09 9.87927e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.444 sec. to 6.444 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98872 ( -0.574544 0.0283921 )
Epeak [keV] : 4.69905 ( -2.65651 -4.20242 )
Norm@50keV : 1.27271E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.79 using 59 PHA bins.
# Reduced chi-squared = 0.9070 for 56 degrees of freedom
# Null hypothesis probability = 6.717410e-01
Photon flux (15-150 keV) in 1 sec: 1.73632 ( -0.07216 0.14275 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02453e-07 ( -1.15391e-08 1.0605e-08 ) ergs/cm2
Band function
Time interval is from 5.444 sec. to 6.444 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93094 ( -14.2603 -4.93094 )
beta : -2.22080 ( -0.216107 0.186969 )
Epeak [keV] : 21.3996 ( -3.649 2.82964 )
Norm@50keV : 4866.99 ( -383.892 27339.4 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.41 using 59 PHA bins.
# Reduced chi-squared = 0.8620 for 55 degrees of freedom
# Null hypothesis probability = 7.565973e-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] : 8.69435 (-0.871589 0.990498)
R^2/D10^2 : 1.33636 (-0.464384 0.703846)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 92.82 using 59 PHA bins.
# Reduced chi-squared = 1.628 for 57 degrees of freedom
# Null hypothesis probability = 1.910771e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.930e-08 2.755e-09
25- 50 3.883e-08 3.910e-09
50-150 1.331e-08 3.232e-09
15-150 7.144e-08 7.275e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 57.9098 (-12.9954 18.745)
Norm : 9.17698 (-1.29081 1.46802)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.24 using 59 PHA bins.
# Reduced chi-squared = 0.9516 for 57 degrees of freedom
# Null hypothesis probability = 5.792022e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.293e-08 2.430e-09
25- 50 3.451e-08 3.050e-09
50-150 3.811e-08 8.240e-09
15-150 9.555e-08 1.011e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.37421 (-1.23352 1.34451)
R1^2/D10^2 : 6.85200 (-2.38099 5.053)
kT2 [keV] : 20.4173 (-6.22096 11.1276)
R2^2/D10^2 : 3.12987E-02 (-0.0127906 0.0363472)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.33 using 59 PHA bins.
# Reduced chi-squared = 0.8969 for 55 degrees of freedom
# Null hypothesis probability = 6.900626e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.455e-08 1.079e-08
25- 50 2.973e-08 1.120e-08
50-150 4.000e-08 2.284e-08
15-150 9.427e-08 3.895e-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: 2.12932 ( -0.0682646 0.0691491 )
Norm@50keV : 7.31739E-03 ( -0.000280338 0.00027857 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.51 using 59 PHA bins.
# Reduced chi-squared = 0.9037 for 57 degrees of freedom
# Null hypothesis probability = 6.802865e-01
Photon flux (15-150 keV) in 18.59 sec: 1.16815 ( -0.0423871 0.0425875 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2677e-06 ( -4.42998e-08 4.44407e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66453 ( -0.306931 0.285312 )
Epeak [keV] : 32.5148 ( )
Norm@50keV : 1.29497E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.45 using 59 PHA bins.
# Reduced chi-squared = 0.7759 for 56 degrees of freedom
# Null hypothesis probability = 8.895522e-01
Photon flux (15-150 keV) in 18.59 sec: 1.12689 ( -0.0485 0.04872 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2099e-06 ( -5.54317e-08 5.58165e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48729 ( -0.379861 6.44001 )
beta : -2.43013 ( 2.43082 0.261012 )
Epeak [keV] : 33.3116 ( -16.1289 6.40595 )
Norm@50keV : 1.66742E-02 ( -0.00637718 792.88 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.75 using 59 PHA bins.
# Reduced chi-squared = 0.7772 for 55 degrees of freedom
# Null hypothesis probability = 8.856558e-01
Photon flux (15-150 keV) in 18.59 sec: 1.11685 ( 5.88315 -0.02647 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21319e-06 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 6.08e-07
S(50-100 keV) = 4.70e-07
T90 vs. Hardness ratio plot
T90 = 41.0279999375343 sec.
Hardness ratio (energy fluence ratio) = 0.773026
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.853435
Count Ratio (50-100 keV) / (15-25 keV) = 0.306309
Mask shadow pattern
IMX = -6.616570248434049E-02, IMY = -7.691472735699574E-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:
-239.424000 -6.312000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5093 35.4545 8.1 36.5 0.2 0.3238 1.4 7.2 Her X-1
299.5651 35.2071 0.8 24.8 -72.4 2.9489 14.3 1.3 Cyg X-1
308.0724 40.9445 1.1 20.3 -92.2 2.1085 10.6 1.8 Cyg X-3
326.0378 38.4359 3.7 28.3 -120.7 0.6383 3.1 9.3 Cyg X-2
256.8352 42.3730 3.1 29.9 5.2 0.6749 3.7 ------ UNKNOWN
342.2834 27.2205 2.8 44.9 -130.8 1.8627 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-6.312000 12.276600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4518 35.1744 64.3 36.7 -0.0 -0.0126 -0.2 10.1 Her X-1
299.5085 35.1274 764.5 24.9 -72.2 -0.0009 -0.0 6.0 Cyg X-1
308.2299 41.1013 9.3 20.1 -92.7 0.0684 1.2 10.4 Cyg X-3
326.0485 38.4617 4.1 28.3 -120.8 -0.1776 -2.8 10.2 Cyg X-2
300.9915 65.4134 0.2 5.8 130.7 2.5914 52.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
37.676600 962.648000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4893 35.4049 11.9 40.5 0.3 0.6850 1.0 4.1 Her X-1
299.5857 35.2170 0.8 30.2 -62.9 8.9550 13.7 0.9 Cyg X-1
308.1302 40.9803 0.8 24.7 -78.2 8.3939 14.9 1.9 Cyg X-3
326.0064 38.2893 3.3 30.7 -105.7 2.1401 3.5 8.0 Cyg X-2
261.7763 31.2312 3.1 41.6 -10.8 2.3070 3.7 ------ UNKNOWN
274.7038 14.1014 3.4 54.3 -33.3 7.5217 3.4 ------ UNKNOWN
Plot creation:
Sat May 30 20:20:11 EDT 2015