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
42.4667 40.4973 0.0212 33.2924 -48.6642 0.1754886 9.063 TRIG_00519211
Foreground time interval of the image:
-0.052 1.540 (delta_t = 1.592 [sec])
Background time interval of the image:
-161.947 -0.052 (delta_t = 161.895 [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 -0.052 sec. to 1.540 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59253 ( -0.281868 0.290615 )
Norm@50keV : 7.18894E-03 ( -0.001347 0.00133021 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.36 using 59 PHA bins.
# Reduced chi-squared = 0.8660 for 57 degrees of freedom
# Null hypothesis probability = 7.539888e-01
Photon flux (15-150 keV) in 1.592 sec: 0.921679 ( -0.164343 0.164599 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07133e-07 ( -2.11886e-08 2.15885e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.052 sec. to 1.540 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.419713 ( -1.51591 1.09075 )
Epeak [keV] : 64.8509 ( -17.6052 247.121 )
Norm@50keV : 2.94530E-02 ( -0.0294542 0.145485 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8249 for 56 degrees of freedom
# Null hypothesis probability = 8.220177e-01
Photon flux (15-150 keV) in 1.592 sec: 0.889198 ( -0.16509 0.167622 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.96896e-08 ( -2.16915e-08 2.26967e-08 ) ergs/cm2
Band function
Time interval is from -0.052 sec. to 1.540 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.418581 ( -1.29677 1.40744 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 64.8179 ( -17.5849 252.25 )
Norm@50keV : 2.94960E-02 ( -0.029496 0.145237 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8399 for 55 degrees of freedom
# Null hypothesis probability = 7.952463e-01
Photon flux (15-150 keV) in 1.592 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.97487e-08 ( -9.97375e-08 -2.17967e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.1464 (-2.7194 3.306)
R^2/D10^2 : 0.132159 (-0.069914 0.150192)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.20 using 59 PHA bins.
# Reduced chi-squared = 0.8808 for 57 degrees of freedom
# Null hypothesis probability = 7.259662e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.885e-09 3.344e-09
25- 50 3.339e-08 9.035e-09
50-150 4.423e-08 1.740e-08
15-150 8.650e-08 2.226e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 164.479 (-84.4136 -162.718)
Norm : 3.83415 (-0.699798 0.915281)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.65 using 59 PHA bins.
# Reduced chi-squared = 0.8360 for 57 degrees of freedom
# Null hypothesis probability = 8.064885e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.554e-08 8.668e-09
25- 50 2.919e-08 1.611e-08
50-150 5.977e-08 3.532e-08
15-150 1.045e-07 5.886e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.18916 (-3.19829 20.7509)
R1^2/D10^2 : 1.21154 (-1.02905 17.966)
kT2 [keV] : 19.3972 (-5.47447 18.4747)
R2^2/D10^2 : 3.43845E-02 (-0.0321244 0.0659169)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.44 using 59 PHA bins.
# Reduced chi-squared = 0.8261 for 55 degrees of freedom
# Null hypothesis probability = 8.176194e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.427e-08 8.302e-09
25- 50 3.053e-08 1.592e-08
50-150 5.555e-08 3.284e-08
15-150 1.004e-07 5.289e-08
Peak spectrum fit
Power-law model
Time interval is from 0.040 sec. to 1.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73465 ( -0.310635 0.331947 )
Norm@50keV : 8.12913E-03 ( -0.00177255 0.00173078 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.86 using 59 PHA bins.
# Reduced chi-squared = 0.9099 for 57 degrees of freedom
# Null hypothesis probability = 6.676295e-01
Photon flux (15-150 keV) in 1 sec: 1.09304 ( -0.211573 0.211703 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.50827e-08 ( -1.66108e-08 1.70531e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.040 sec. to 1.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.724554 ( -1.46751 1.11493 )
Epeak [keV] : 59.3033 ( -15.9939 -59.371 )
Norm@50keV : 2.81938E-02 ( -0.0280599 0.142187 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.49 using 59 PHA bins.
# Reduced chi-squared = 0.8837 for 56 degrees of freedom
# Null hypothesis probability = 7.181007e-01
Photon flux (15-150 keV) in 1 sec: 1.06380 ( -0.212692 0.21359 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.08414e-08 ( -1.68569e-08 1.76445e-08 ) ergs/cm2
Band function
Time interval is from 0.040 sec. to 1.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.719246 ( -0.868718 1.7558 )
beta : -10.0000 ( 10 1.42109e-14 )
Epeak [keV] : 59.1930 ( -19.5253 8574.02 )
Norm@50keV : 2.83951E-02 ( -0.0283931 0.141986 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.49 using 59 PHA bins.
# Reduced chi-squared = 0.8998 for 55 degrees of freedom
# Null hypothesis probability = 6.843752e-01
Photon flux (15-150 keV) in 1 sec: 1.07103 ( 5.92897 -0.203977 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.10154e-08 ( -7.10084e-08 -1.66988e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.8997 (-3.17503 3.87668)
R^2/D10^2 : 0.209863 (-0.127469 0.370652)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.94 using 59 PHA bins.
# Reduced chi-squared = 0.9639 for 57 degrees of freedom
# Null hypothesis probability = 5.525918e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.407e-09 2.694e-09
25- 50 2.530e-08 7.970e-09
50-150 2.649e-08 1.120e-08
15-150 5.920e-08 1.859e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.4696 (-41.7076 -100.035)
Norm : 4.92969 (-1.14141 1.31789)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.17 using 59 PHA bins.
# Reduced chi-squared = 0.8801 for 57 degrees of freedom
# Null hypothesis probability = 7.271643e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.288e-08 3.705e-09
25- 50 2.226e-08 8.641e-09
50-150 3.596e-08 2.617e-08
15-150 7.110e-08 3.571e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.02504 (-2.37785 3.3113)
R1^2/D10^2 : 2.01540 (-1.61573 12.1843)
kT2 [keV] : 20.2471 (-5.99428 12.2059)
R2^2/D10^2 : 3.13872E-02 (-0.027461 0.0626927)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.92 using 59 PHA bins.
# Reduced chi-squared = 0.8712 for 55 degrees of freedom
# Null hypothesis probability = 7.396627e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.225e-08 7.410e-09
25- 50 2.224e-08 1.150e-08
50-150 3.864e-08 2.225e-08
15-150 7.313e-08 4.023e-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: 1.59253 ( -0.281868 0.290615 )
Norm@50keV : 7.18894E-03 ( -0.001347 0.00133021 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.36 using 59 PHA bins.
# Reduced chi-squared = 0.8660 for 57 degrees of freedom
# Null hypothesis probability = 7.539888e-01
Photon flux (15-150 keV) in 1.592 sec: 0.921679 ( -0.164343 0.164599 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07133e-07 ( -2.11886e-08 2.15885e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.419713 ( -1.51591 1.09075 )
Epeak [keV] : 64.8509 ( -17.6052 247.121 )
Norm@50keV : 2.94530E-02 ( -0.0294542 0.145485 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8249 for 56 degrees of freedom
# Null hypothesis probability = 8.220177e-01
Photon flux (15-150 keV) in 1.592 sec: 0.889198 ( -0.16509 0.167622 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.96896e-08 ( -2.16915e-08 2.26967e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.418581 ( -1.29677 1.40744 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 64.8179 ( -17.5849 244.551 )
Norm@50keV : 2.94960E-02 ( -0.029496 0.145237 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8399 for 55 degrees of freedom
# Null hypothesis probability = 7.952463e-01
Photon flux (15-150 keV) in 1.592 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.97487e-08 ( -9.97375e-08 -2.17967e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 2.77e-08
S(50-100 keV) = 3.67e-08
T90 vs. Hardness ratio plot
T90 = 1.39599996805191 sec.
Hardness ratio (energy fluence ratio) = 1.32491
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.1886
Count Ratio (50-100 keV) / (15-25 keV) = 1.1022
Mask shadow pattern
IMX = 4.337226059683312E-01, IMY = 4.930748108105984E-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:
-161.947400 -0.052000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6380 22.0134 0.3 6.1 144.4 6.7593 45.4 0.3 Crab
91.3334 5.8555 2.7 23.8 155.8 0.7798 4.4 ------ UNKNOWN
69.4163 55.0442 2.9 29.3 -4.2 0.6994 4.0 ------ UNKNOWN
54.6206 -23.2694 9.9 55.2 -145.1 1.1896 1.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.052000 1.540000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.7295 21.8776 3.7 6.3 144.7 0.0378 3.1 9.8 Crab
112.2932 49.1206 1.9 34.1 46.9 0.1335 6.2 ------ UNKNOWN
87.0282 -8.7987 2.5 36.2 174.0 0.0857 4.6 ------ UNKNOWN
71.9899 12.5922 2.7 15.5 -145.7 0.0537 4.3 ------ UNKNOWN
56.9245 34.6259 2.2 20.7 -54.5 0.0757 5.3 ------ UNKNOWN
42.4667 40.4973 1.3 33.3 -48.7 0.1755 9.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
952.852600 962.360800
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6297 22.0684 2.4 54.9 -153.5 0.5287 4.8 3.2 Crab
207.8815 51.7674 2.8 37.6 41.6 0.2118 4.1 ------ UNKNOWN
96.6873 16.0286 3.0 56.6 -170.0 0.4749 3.8 ------ UNKNOWN
Plot creation:
Sat May 30 19:41:26 EDT 2015