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
252.9756 39.9610 0.0244 22.6469 40.6295 0.0572317 7.868 TRIG_00599188
Foreground time interval of the image:
-0.024 0.296 (delta_t = 0.320 [sec])
Background time interval of the image:
-315.915 -300.722 (delta_t = 15.193 [sec])
-239.816 -0.024 (delta_t = 239.792 [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 0.128000
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 0.128000
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 0.128000
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 -0.024 sec. to 0.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89057 ( -0.30734 0.340045 )
Norm@50keV : 1.02394E-02 ( -0.00247323 0.00241023 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.51 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 57 degrees of freedom
# Null hypothesis probability = 1.822481e-01
Photon flux (15-150 keV) in 0.32 sec: 1.46363 ( -0.291781 0.291785 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.01173e-08 ( -7.01238e-09 7.24653e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 0.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.484079 ( -2.74615 1.67998 )
Epeak [keV] : 44.5729 ( -8.92008 16.0482 )
Norm@50keV : 0.229200 ( -0.231068 9.10047 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.78 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 56 degrees of freedom
# Null hypothesis probability = 3.400234e-01
Photon flux (15-150 keV) in 0.32 sec: 1.41208 ( -0.28991 0.29148 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.68158e-08 ( -6.29606e-09 7.15958e-09 ) ergs/cm2
Band function
Time interval is from -0.024 sec. to 0.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.460364 ( -1.29939 4.81231 )
beta : -10.0000 ( 10 2.84217e-14 )
Epeak [keV] : 44.5659 ( -8.98581 16.0866 )
Norm@50keV : 0.222863 ( -0.222747 9.11275 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.78 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Null hypothesis probability = 3.061903e-01
Photon flux (15-150 keV) in 0.32 sec: 1.42901 ( 5.57099 -0.30934 ) 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] : 11.0677 (-1.87427 2.32358)
R^2/D10^2 : 0.526757 (-0.272667 0.522857)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.36 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 57 degrees of freedom
# Null hypothesis probability = 3.554661e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.319e-09 1.574e-09
25- 50 1.231e-08 3.432e-09
50-150 8.558e-09 4.060e-09
15-150 2.519e-08 7.003e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 75.0102 (-30.3165 72.9775)
Norm : 7.26247 (-1.96855 2.26915)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.97 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 57 degrees of freedom
# Null hypothesis probability = 2.735000e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.002e-09 1.600e-09
25- 50 9.724e-09 2.936e-09
50-150 1.313e-08 9.932e-09
15-150 2.886e-08 1.048e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.90302 (-5.86418 -5.86418)
R1^2/D10^2 : 381.261 ( )
kT2 [keV] : 11.5090 (-2.10405 -11.5083)
R2^2/D10^2 : 0.442860 (-0.443475 0.523436)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.77 using 59 PHA bins.
#Fit statistic : Chi-Squared = 59.75 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Reduced chi-squared = 1.086 for 55 degrees of freedom
# Null hypothesis probability = 3.064772e-01
# Null hypothesis probability = 3.071248e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.900e-09 2.734e-09
25- 50 1.148e-08 6.395e-09
50-150 1.016e-08 6.035e-09
15-150 2.654e-08 1.521e-08
Peak spectrum fit
Power-law model
Time interval is from -0.332 sec. to 0.668 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81491 ( -0.482947 0.561778 )
Norm@50keV : 3.61151E-03 ( -0.00132002 0.00125856 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.41 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 57 degrees of freedom
# Null hypothesis probability = 1.627446e-01
Photon flux (15-150 keV) in 1 sec: 0.500563 ( -0.149468 0.149471 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.32342e-08 ( -1.16924e-08 1.23188e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.332 sec. to 0.668 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.302814 ( -5.46871 2.47795 )
Epeak [keV] : 48.1480 ( -48.129 -48.129 )
Norm@50keV : 5.30401E-02 ( -0.0546393 42.1494 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.41 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 56 degrees of freedom
# Null hypothesis probability = 1.824672e-01
Photon flux (15-150 keV) in 1 sec: 0.474331 ( -0.155438 0.153299 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94599e-08 ( -1.10365e-08 1.26597e-08 ) ergs/cm2
Band function
Time interval is from -0.332 sec. to 0.668 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.141232 ( -1.81311 0.186895 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 48.5363 ( -22.2174 55.7247 )
Norm@50keV : 4.34496E-02 ( -0.0434455 14.9334 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.42 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 55 degrees of freedom
# Null hypothesis probability = 1.587576e-01
Photon flux (15-150 keV) in 1 sec: 0.477759 ( ) 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] : 11.9568 (-2.96695 4.0649)
R^2/D10^2 : 0.133640 (-0.133641 0.242584)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.61 using 59 PHA bins.
# Reduced chi-squared = 1.151 for 57 degrees of freedom
# Null hypothesis probability = 2.030636e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.040e-09 2.502e-09
25- 50 1.266e-08 7.480e-09
50-150 1.086e-08 6.963e-09
15-150 2.756e-08 1.639e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 87.9480 (-49.8857 -87.9822)
Norm : 2.33602 (-0.777315 1.18994)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.40 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 57 degrees of freedom
# Null hypothesis probability = 1.847012e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.091e-09 3.698e-09
25- 50 1.025e-08 6.255e-09
50-150 1.538e-08 1.312e-08
15-150 3.172e-08 2.319e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.10512 (-2.07087 22.2043)
R1^2/D10^2 : 126.286 (-137.428 -137.428)
kT2 [keV] : 12.9818 (-3.47953 -12.9701)
R2^2/D10^2 : 9.31273E-02 (-0.0934752 0.206027)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.27 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 55 degrees of freedom
# Null hypothesis probability = 1.837902e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.132e-09 2.402e-09
25- 50 1.151e-08 6.865e-09
50-150 1.219e-08 8.280e-09
15-150 2.883e-08 1.749e-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: 1.89057 ( -0.30734 0.340045 )
Norm@50keV : 1.02394E-02 ( -0.00247323 0.00241023 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.51 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 57 degrees of freedom
# Null hypothesis probability = 1.822481e-01
Photon flux (15-150 keV) in 0.32 sec: 1.46363 ( -0.291781 0.291785 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.01173e-08 ( -7.01238e-09 7.24653e-09 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.484079 ( -2.74615 1.67998 )
Epeak [keV] : 44.5729 ( -8.92008 16.0482 )
Norm@50keV : 0.229200 ( -0.231068 9.10047 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.78 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 56 degrees of freedom
# Null hypothesis probability = 3.400234e-01
Photon flux (15-150 keV) in 0.32 sec: 1.41208 ( -0.28991 0.29148 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.68158e-08 ( -6.29606e-09 7.15958e-09 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.460364 ( -1.29939 4.81231 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 44.5659 ( -8.98581 16.0866 )
Norm@50keV : 0.222863 ( -0.222747 9.11275 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.78 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Null hypothesis probability = 3.061903e-01
Photon flux (15-150 keV) in 0.32 sec: 1.42901 ( 5.57099 -0.30934 ) 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) = 8.76e-09
S(50-100 keV) = 9.45e-09
T90 vs. Hardness ratio plot
T90 = 0.25600004196167 sec.
Hardness ratio (energy fluence ratio) = 1.07877
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.27924
Count Ratio (50-100 keV) / (15-25 keV) = 0.708353
Mask shadow pattern
IMX = 3.166435238837305E-01, IMY = -2.716794441283923E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
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:
-315.915400 -300.722100
-239.816000 -0.024000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4156 35.4933 13.0 27.0 44.3 0.2238 0.9 9.3 Her X-1
299.5405 35.1397 11.0 51.0 -2.2 -0.4768 -1.0 4.4 Cyg X-1
308.1004 40.7658 11.7 51.5 -13.5 0.4930 1.0 11.2 Cyg X-3
187.3352 18.4573 3.0 49.0 151.4 3.1659 3.9 ------ UNKNOWN
157.9231 25.8009 2.6 58.4 -175.4 5.6920 4.4 ------ UNKNOWN
193.1117 76.1255 2.0 23.7 -105.8 1.2960 5.7 ------ UNKNOWN
323.9738 43.3958 3.6 57.6 -26.3 3.9030 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.024000 0.296000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5399 35.2814 5.4 27.2 44.3 0.0183 2.1 5.4 Her X-1
299.6265 35.1397 4.1 51.0 -2.3 -0.0442 -2.8 4.1 Cyg X-1
307.9342 41.0150 26.2 51.2 -13.6 -0.0064 -0.4 8.8 Cyg X-3
201.3914 32.4282 2.4 30.5 145.0 0.0407 4.8 ------ UNKNOWN
252.9753 39.9625 1.5 22.6 40.6 0.0566 7.8 ------ UNKNOWN
291.9644 51.6983 2.1 36.0 -15.4 0.0431 5.6 ------ UNKNOWN
128.6122 63.4394 2.0 45.6 -123.3 0.1498 5.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
63.084600 962.277200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4557 35.3442 33.3 4.7 54.7 0.1897 0.3 0.1 Her X-1
268.4179 -1.6061 0.0 43.9 46.8 0.4092 0.2 9.7 SW J1753.5-0127
288.8032 10.9367 1.3 42.9 11.8 8.2479 9.0 0.6 GRS 1915+105
299.5882 35.1957 0.3 36.8 -28.5 29.9685 38.0 0.4 Cyg X-1
308.0853 40.9685 2.5 41.2 -40.7 4.7256 4.5 1.5 Cyg X-3
296.4533 0.6373 3.4 55.7 12.9 13.0637 3.4 ------ UNKNOWN
274.2783 12.7944 2.5 33.0 28.7 3.4745 4.5 ------ UNKNOWN
290.0202 23.7545 4.6 35.0 -4.5 1.7898 2.5 ------ UNKNOWN
251.6327 53.5484 2.3 13.7 -114.1 2.8699 5.1 ------ UNKNOWN
163.3687 62.2552 9.7 55.2 -145.2 5.5924 1.2 ------ UNKNOWN
Plot creation:
Sat May 30 13:31:03 EDT 2015