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
286.7130 56.0697 0.0131 9.5266 -163.6028 0.4344129 14.692 TRIG_00458059
Foreground time interval of the image:
-0.864 5.012 (delta_t = 5.876 [sec])
Background time interval of the image:
-239.744 -0.864 (delta_t = 238.880 [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 -0.864 sec. to 5.012 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85879 ( -0.173682 0.182257 )
Norm@50keV : 4.53612E-03 ( -0.000555106 0.000545827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.71 using 59 PHA bins.
# Reduced chi-squared = 1.539 for 57 degrees of freedom
# Null hypothesis probability = 5.559035e-03
Photon flux (15-150 keV) in 5.876 sec: 0.639888 ( -0.0627806 0.0627814 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45062e-07 ( -2.95783e-08 3.03203e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.864 sec. to 5.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.637790 ( -0.955678 0.779242 )
Epeak [keV] : 46.5334 ( -8.10926 15.5559 )
Norm@50keV : 2.28581E-02 ( -0.0145744 0.0595655 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.85 using 59 PHA bins.
# Reduced chi-squared = 1.426 for 56 degrees of freedom
# Null hypothesis probability = 1.987724e-02
Photon flux (15-150 keV) in 5.876 sec: 0.612647 ( -0.063998 0.06432 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17839e-07 ( -3.03478e-08 3.29526e-08 ) ergs/cm2
Band function
Time interval is from -0.864 sec. to 5.012 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.637824 ( -0.604474 1.20743 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 46.5249 ( -8.10809 15.5529 )
Norm@50keV : 2.28574E-02 ( -0.014575 0.0597207 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.85 using 59 PHA bins.
# Reduced chi-squared = 1.452 for 55 degrees of freedom
# Null hypothesis probability = 1.594027e-02
Photon flux (15-150 keV) in 5.876 sec: 0.618469 ( 6.38153 -0.070851 ) 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] : 10.5990 (-1.15317 1.31252)
R^2/D10^2 : 0.247834 (-0.0876467 0.133303)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.90 using 59 PHA bins.
# Reduced chi-squared = 1.595 for 57 degrees of freedom
# Null hypothesis probability = 2.877044e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.390e-08 5.870e-09
25- 50 9.130e-08 1.175e-08
50-150 5.625e-08 1.522e-08
15-150 1.814e-07 2.262e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 79.4955 (-21.7332 37.1399)
Norm : 3.03731 (-0.408956 0.491776)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.77 using 59 PHA bins.
# Reduced chi-squared = 1.435 for 57 degrees of freedom
# Null hypothesis probability = 1.740915e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.629e-08 6.214e-09
25- 50 7.609e-08 8.755e-09
50-150 1.069e-07 4.865e-08
15-150 2.293e-07 4.842e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.25815 (-2.22849 2.10815)
R1^2/D10^2 : 1.02725 (-0.608158 3.50446)
kT2 [keV] : 17.1842 (-4.39467 8.58459)
R2^2/D10^2 : 2.78467E-02 (-0.0231787 0.0762238)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.01 using 59 PHA bins.
# Reduced chi-squared = 1.437 for 55 degrees of freedom
# Null hypothesis probability = 1.862346e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.310e-08 2.322e-08
25- 50 8.012e-08 3.953e-08
50-150 9.657e-08 5.738e-08
15-150 2.198e-07 1.141e-07
Peak spectrum fit
Power-law model
Time interval is from 0.612 sec. to 1.612 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64607 ( -0.236566 0.244939 )
Norm@50keV : 7.72695E-03 ( -0.00129603 0.00127831 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.33 using 59 PHA bins.
# Reduced chi-squared = 1.322 for 57 degrees of freedom
# Null hypothesis probability = 5.242713e-02
Photon flux (15-150 keV) in 1 sec: 1.00764 ( -0.150357 0.150368 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.19009e-08 ( -1.26316e-08 1.30101e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.612 sec. to 1.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.324418 ( -1.73197 1.21815 )
Epeak [keV] : 49.9844 ( -8.95647 18.6769 )
Norm@50keV : 0.102301 ( -0.102599 0.945388 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.31 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 56 degrees of freedom
# Null hypothesis probability = 1.630521e-01
Photon flux (15-150 keV) in 1 sec: 0.956231 ( -0.149972 0.151079 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.07506e-08 ( -1.18324e-08 1.34239e-08 ) ergs/cm2
Band function
Time interval is from 0.612 sec. to 1.612 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.310700 ( -0.932365 2.17608 )
beta : -10.0000 ( 10 5.32907e-15 )
Epeak [keV] : 50.0436 ( -9.06946 18.5859 )
Norm@50keV : 0.100529 ( -0.100529 0.946965 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.31 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 55 degrees of freedom
# Null hypothesis probability = 1.412820e-01
Photon flux (15-150 keV) in 1 sec: 0.956186 ( 6.04381 -0.148778 ) 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] : 11.8613 (-1.68715 2.05716)
R^2/D10^2 : 0.276806 (-0.123617 0.209181)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.99 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 57 degrees of freedom
# Null hypothesis probability = 1.511285e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.228e-09 2.212e-09
25- 50 2.554e-08 5.375e-09
50-150 2.144e-08 7.010e-09
15-150 5.521e-08 1.119e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 121.645 (-50.1151 -119.235)
Norm : 4.32000 (-0.665246 0.925961)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.49 using 59 PHA bins.
# Reduced chi-squared = 1.254 for 57 degrees of freedom
# Null hypothesis probability = 9.382851e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.125e-08 5.517e-09
25- 50 2.017e-08 1.116e-08
50-150 3.623e-08 2.351e-08
15-150 6.764e-08 3.910e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.04026 (-8.06476 191.932)
R1^2/D10^2 : 0.612811 (-0.609089 -0.609089)
kT2 [keV] : 17.7116 (-17.9541 -17.9541)
R2^2/D10^2 : 3.90392E-02 (-0.0367125 0.31202)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.73 using 59 PHA bins.
# Reduced chi-squared = 1.195 for 55 degrees of freedom
# Null hypothesis probability = 1.523822e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.655e-09 6.585e-09
25- 50 2.395e-08 1.428e-08
50-150 2.892e-08 1.780e-08
15-150 6.253e-08 3.674e-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: 1.85879 ( -0.173682 0.182257 )
Norm@50keV : 4.53612E-03 ( -0.000555106 0.000545827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.71 using 59 PHA bins.
# Reduced chi-squared = 1.539 for 57 degrees of freedom
# Null hypothesis probability = 5.559035e-03
Photon flux (15-150 keV) in 5.876 sec: 0.639888 ( -0.0627806 0.0627814 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45062e-07 ( -2.95783e-08 3.03203e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.637790 ( -0.955678 0.779242 )
Epeak [keV] : 46.5334 ( -8.10926 15.5559 )
Norm@50keV : 2.28581E-02 ( -0.0145744 0.0595655 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.85 using 59 PHA bins.
# Reduced chi-squared = 1.426 for 56 degrees of freedom
# Null hypothesis probability = 1.987724e-02
Photon flux (15-150 keV) in 5.876 sec: 0.612647 ( -0.063998 0.06432 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17839e-07 ( -3.03478e-08 3.29526e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.637824 ( -0.604474 1.20743 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 46.5249 ( -8.10809 15.5529 )
Norm@50keV : 2.28574E-02 ( -0.014575 0.0597207 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.85 using 59 PHA bins.
# Reduced chi-squared = 1.452 for 55 degrees of freedom
# Null hypothesis probability = 1.594027e-02
Photon flux (15-150 keV) in 5.876 sec: 0.618469 ( 6.38153 -0.070851 ) 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) = 7.05e-08
S(50-100 keV) = 7.77e-08
T90 vs. Hardness ratio plot
T90 = 5.15599995851517 sec.
Hardness ratio (energy fluence ratio) = 1.10213
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.34712
Count Ratio (50-100 keV) / (15-25 keV) = 0.686828
Mask shadow pattern
IMX = -1.609943794173015E-01, IMY = 4.737474650099357E-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:
-239.744000 -0.864000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5628 35.3538 10.3 39.0 178.8 -0.4420 -1.1 5.2 Her X-1
299.5881 35.1897 0.4 21.2 109.5 9.2091 29.4 0.7 Cyg X-1
308.1466 40.8778 2.9 15.5 87.6 1.0248 3.9 4.8 Cyg X-3
326.1796 38.2292 6.6 23.3 50.7 0.5240 1.8 5.6 Cyg X-2
5.9879 54.7754 3.7 34.0 -14.6 0.9265 3.1 ------ UNKNOWN
224.1782 31.5250 3.4 58.7 -159.1 6.6531 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.864000 5.012000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3950 35.3527 4.1 39.1 179.0 -0.1262 -2.8 3.1 Her X-1
299.6568 35.3126 7.9 21.0 109.3 -0.0574 -1.5 7.4 Cyg X-1
308.2319 41.0237 4.8 15.4 87.2 -0.0863 -2.4 7.0 Cyg X-3
325.9986 38.3773 3.4 23.1 50.8 0.1288 3.4 8.8 Cyg X-2
286.7130 56.0697 0.8 9.5 -163.6 0.4344 14.7 ------ UNKNOWN
19.0693 44.5821 2.2 46.8 -9.4 0.2953 5.2 ------ UNKNOWN
330.7708 70.2832 2.6 18.3 -51.1 0.1378 4.5 ------ UNKNOWN
71.2681 76.4801 2.6 43.2 -64.5 0.4866 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
42.156600 742.956620
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6029 35.2711 8.9 30.1 167.8 0.9609 1.3 8.3 Her X-1
299.5840 35.1941 0.3 22.6 79.7 28.6117 39.4 0.5 Cyg X-1
308.1558 40.9349 1.9 20.5 56.2 3.7929 6.1 2.3 Cyg X-3
326.2462 38.3649 7.8 31.5 35.2 1.1962 1.5 4.4 Cyg X-2
205.4748 37.3152 3.8 55.2 -145.3 16.5905 3.0 ------ UNKNOWN
197.5844 57.3915 3.2 45.3 -121.4 8.7783 3.6 ------ UNKNOWN
Plot creation:
Sat May 30 21:56:59 EDT 2015