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
199.6916 62.2971 0.0027 21.2378 159.5756 4.7735500 70.025 TRIG_00530689
Foreground time interval of the image:
-9.676 12.205 (delta_t = 21.881 [sec])
Background time interval of the image:
-427.295 -408.540 (delta_t = 18.755 [sec])
-239.696 -9.676 (delta_t = 230.020 [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)
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 -9.676 sec. to 31.388 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99143 ( -0.0561722 0.0566533 )
Norm@50keV : 8.04955E-03 ( -0.000239251 0.000238326 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.95 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 57 degrees of freedom
# Null hypothesis probability = 1.950401e-01
Photon flux (15-150 keV) in 41.06 sec: 1.20270 ( -0.0361069 0.0362706 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.04663e-06 ( -8.70764e-08 8.73256e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.676 sec. to 31.388 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33096 ( -0.277669 0.260572 )
Epeak [keV] : 47.3123 ( -4.70882 5.24831 )
Norm@50keV : 1.76156E-02 ( -0.00460376 0.00678916 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.52 using 59 PHA bins.
# Reduced chi-squared = 0.8129 for 56 degrees of freedom
# Null hypothesis probability = 8.402219e-01
Photon flux (15-150 keV) in 41.06 sec: 1.13659 ( -0.043 0.04328 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.84559e-06 ( -1.12944e-07 1.13942e-07 ) ergs/cm2
Band function
Time interval is from -9.676 sec. to 31.388 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13605 ( -0.365249 0.533791 )
beta : -2.43422 ( -0.808421 0.239848 )
Epeak [keV] : 44.6268 ( -5.7929 5.79261 )
Norm@50keV : 2.29537E-02 ( -0.00842525 0.0254864 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.70 using 59 PHA bins.
# Reduced chi-squared = 0.7946 for 55 degrees of freedom
# Null hypothesis probability = 8.635891e-01
Photon flux (15-150 keV) in 41.06 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.85758e-06 ( -2.8573e-06 -1.10928e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.6394 ( )
R^2/D10^2 : 0.291193 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 218.38 using 59 PHA bins.
# Reduced chi-squared = 3.8313 for 57 degrees of freedom
# Null hypothesis probability = 9.882221e-21
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.415e-07 1.747e-08
25- 50 1.036e-06 3.203e-08
50-150 8.267e-07 5.440e-08
15-150 2.205e-06 5.789e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 74.6599 (-6.66383 7.74663)
Norm : 5.58703 (-0.277037 0.295797)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.43 using 59 PHA bins.
# Reduced chi-squared = 0.7970 for 57 degrees of freedom
# Null hypothesis probability = 8.651715e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.922e-07 2.505e-08
25- 50 9.583e-07 2.669e-08
50-150 1.290e-06 8.705e-08
15-150 2.840e-06 8.582e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.39262 (-0.915203 0.985985)
R1^2/D10^2 : 1.84144 (-0.683913 1.36727)
kT2 [keV] : 18.8504 (-2.26577 3.4673)
R2^2/D10^2 : 3.29623E-02 (-0.0169054 0.0251218)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.95 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 55 degrees of freedom
# Null hypothesis probability = 4.023365e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.420e-07 5.789e-08
25- 50 9.638e-07 7.678e-08
50-150 1.242e-06 1.359e-07
15-150 2.748e-06 2.620e-07
Peak spectrum fit
Power-law model
Time interval is from 5.268 sec. to 6.268 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77651 ( -0.0915318 0.0930843 )
Norm@50keV : 3.01951E-02 ( -0.00169052 0.00167843 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.10 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 57 degrees of freedom
# Null hypothesis probability = 2.995141e-01
Photon flux (15-150 keV) in 1 sec: 4.12353 ( -0.212073 0.212292 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.78243e-07 ( -1.59984e-08 1.61154e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.268 sec. to 6.268 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01966 ( -0.43709 0.39746 )
Epeak [keV] : 60.0748 ( -8.36932 18.0877 )
Norm@50keV : 7.61234E-02 ( -0.0288086 0.052776 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.67 using 59 PHA bins.
# Reduced chi-squared = 0.9049 for 56 degrees of freedom
# Null hypothesis probability = 6.760537e-01
Photon flux (15-150 keV) in 1 sec: 3.96417 ( -0.22603 0.22625 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60351e-07 ( -1.8051e-08 1.8333e-08 ) ergs/cm2
Band function
Time interval is from 5.268 sec. to 6.268 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01960 ( -0.357853 0.379318 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 60.0616 ( -7.89251 18.0859 )
Norm@50keV : 7.61246E-02 ( -0.0287922 0.0528565 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.67 using 59 PHA bins.
# Reduced chi-squared = 0.9213 for 55 degrees of freedom
# Null hypothesis probability = 6.405193e-01
Photon flux (15-150 keV) in 1 sec: 3.97511 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60097e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.3587 (-0.74083 0.789652)
R^2/D10^2 : 0.885053 (-0.181182 0.227326)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 109.69 using 59 PHA bins.
# Reduced chi-squared = 1.9245 for 57 degrees of freedom
# Null hypothesis probability = 3.441067e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.865e-08 2.610e-09
25- 50 9.328e-08 5.595e-09
50-150 8.733e-08 1.075e-08
15-150 2.093e-07 1.270e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 108.296 (-20.885 24.7182)
Norm : 17.7314 (-1.17371 1.47117)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.02 using 59 PHA bins.
# Reduced chi-squared = 0.9127 for 57 degrees of freedom
# Null hypothesis probability = 6.618317e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.632e-08 4.155e-09
25- 50 8.134e-08 4.940e-09
50-150 1.377e-07 4.085e-08
15-150 2.654e-07 4.390e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.98899 (-1.18623 1.34121)
R1^2/D10^2 : 7.28773 (-3.53781 9.09589)
kT2 [keV] : 18.8678 (-2.55556 3.88649)
R2^2/D10^2 : 0.142830 (-0.0779398 0.12098)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.64 using 59 PHA bins.
# Reduced chi-squared = 0.9208 for 55 degrees of freedom
# Null hypothesis probability = 6.416435e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.466e-08 1.186e-08
25- 50 8.236e-08 1.395e-08
50-150 1.284e-07 3.025e-08
15-150 2.554e-07 5.275e-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: 1.94291 ( -0.0507956 0.051157 )
Norm@50keV : 1.32114E-02 ( -0.000354636 0.000353585 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.43 using 59 PHA bins.
# Reduced chi-squared = 1.253 for 57 degrees of freedom
# Null hypothesis probability = 9.462917e-02
Photon flux (15-150 keV) in 21.88 sec: 1.93148 ( -0.0543608 0.0545901 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.65962e-06 ( -6.99797e-08 7.0123e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27029 ( -0.246933 0.233467 )
Epeak [keV] : 51.7554 ( -4.24973 5.47113 )
Norm@50keV : 2.89943E-02 ( -0.0068018 0.00955058 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.79 using 59 PHA bins.
# Reduced chi-squared = 0.7998 for 56 degrees of freedom
# Null hypothesis probability = 8.589065e-01
Photon flux (15-150 keV) in 21.88 sec: 1.82480 ( -0.06354 0.06391 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49032e-06 ( -8.81764e-08 8.87015e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04037 ( -0.366103 0.753681 )
beta : -2.36188 ( 2.3619 0.221329 )
Epeak [keV] : 47.3524 ( -8.26423 7.08932 )
Norm@50keV : 3.96456E-02 ( -0.0147011 0.0821402 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.67 using 59 PHA bins.
# Reduced chi-squared = 0.7757 for 55 degrees of freedom
# Null hypothesis probability = 8.873688e-01
Photon flux (15-150 keV) in 21.88 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50134e-06 ( -2.50119e-06 -8.69511e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 9.15e-07
S(50-100 keV) = 9.20e-07
T90 vs. Hardness ratio plot
T90 = 24.3439999222755 sec.
Hardness ratio (energy fluence ratio) = 1.00546
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.09954
Count Ratio (50-100 keV) / (15-25 keV) = 0.562333
Mask shadow pattern
IMX = -3.642017794637605E-01, IMY = -1.356221535428241E-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:
-427.295400 -408.540500
-239.696000 -9.676000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
206.0618 21.8673 2.6 58.4 -171.7 5.2825 4.5 ------ UNKNOWN
143.2927 28.6510 3.0 41.2 -98.0 4.2448 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-9.676000 12.204600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
199.6916 62.2971 0.2 21.2 159.6 4.7736 70.0 ------ UNKNOWN
189.8005 19.7735 2.2 55.7 -153.7 1.5486 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
55.404620 962.350700
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6205 35.4400 24.0 43.0 124.6 -1.0657 -0.5 9.9 Her X-1
49.2633 60.3147 2.8 55.3 5.1 8.1982 4.1 ------ UNKNOWN
94.1333 74.3180 3.3 35.0 -4.6 2.4068 3.5 ------ UNKNOWN
215.1824 12.2801 2.6 51.2 -177.2 6.0958 4.5 ------ UNKNOWN
88.4414 55.3760 2.6 50.7 -20.8 5.0558 4.4 ------ UNKNOWN
Plot creation:
Sat May 30 18:45:08 EDT 2015