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
44.7845 57.1039 0.0079 16.7802 95.7990 0.8894706 24.376 TRIG_00506519
Foreground time interval of the image:
20.724 29.196 (delta_t = 8.472 [sec])
Background time interval of the image:
-239.000 20.724 (delta_t = 259.724 [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 96.000000
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 96.000000
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 96.000000
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 20.724 sec. to 29.196 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.11060 ( -0.128374 0.133365 )
Norm@50keV : 5.35810E-03 ( -0.000487756 0.000482017 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.52 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 57 degrees of freedom
# Null hypothesis probability = 2.053230e-01
Photon flux (15-150 keV) in 8.472 sec: 0.847406 ( -0.0593594 0.0593776 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.22198e-07 ( -3.4637e-08 3.5148e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 20.724 sec. to 29.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.767936 ( -0.776396 0.658423 )
Epeak [keV] : 36.1255 ( -6.05584 5.31864 )
Norm@50keV : 3.36543E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.39 using 59 PHA bins.
# Reduced chi-squared = 0.9177 for 56 degrees of freedom
# Null hypothesis probability = 6.497130e-01
Photon flux (15-150 keV) in 8.472 sec: 0.807409 ( -0.06147 0.061736 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.73117e-07 ( -3.60382e-08 3.88018e-08 ) ergs/cm2
Band function
Time interval is from 20.724 sec. to 29.196 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.529556 ( -0.899173 2.4964 )
beta : -3.04694 ( 3.04398 0.65097 )
Epeak [keV] : 35.0314 ( -7.04224 6.21521 )
Norm@50keV : 4.88679E-02 ( -0.0302405 3.54584 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.29 using 59 PHA bins.
# Reduced chi-squared = 0.9326 for 55 degrees of freedom
# Null hypothesis probability = 6.170117e-01
Photon flux (15-150 keV) in 8.472 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.82158e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.34831 (-0.689015 0.743639)
R^2/D10^2 : 0.511943 (-0.133575 0.180508)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.06 using 59 PHA bins.
# Reduced chi-squared = 1.229 for 57 degrees of freedom
# Null hypothesis probability = 1.147610e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.517e-08 8.345e-09
25- 50 1.694e-07 1.406e-08
50-150 7.248e-08 1.474e-08
15-150 3.170e-07 2.830e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 52.7590 (-9.06944 12.3192)
Norm : 4.69561 (-0.520044 0.633128)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.20 using 59 PHA bins.
# Reduced chi-squared = 0.9333 for 57 degrees of freedom
# Null hypothesis probability = 6.184409e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.842e-08 9.192e-09
25- 50 1.440e-07 1.067e-08
50-150 1.470e-07 2.868e-08
15-150 3.894e-07 3.643e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.78802 (-1.81378 1.77835)
R1^2/D10^2 : 2.00702 (-1.09724 5.15358)
kT2 [keV] : 14.7648 (-3.41496 8.14181)
R2^2/D10^2 : 5.50679E-02 (-0.0479467 0.142836)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.28 using 59 PHA bins.
# Reduced chi-squared = 0.9324 for 55 degrees of freedom
# Null hypothesis probability = 6.174576e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.309e-08 3.184e-08
25- 50 1.497e-07 5.303e-08
50-150 1.283e-07 6.714e-08
15-150 3.711e-07 1.457e-07
Peak spectrum fit
Power-law model
Time interval is from 23.616 sec. to 24.616 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.21580 ( -0.212138 0.229761 )
Norm@50keV : 8.81172E-03 ( -0.00149405 0.0014695 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.96 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 57 degrees of freedom
# Null hypothesis probability = 3.688028e-01
Photon flux (15-150 keV) in 1 sec: 1.47104 ( -0.17029 0.170314 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.30369e-08 ( -1.19591e-08 1.23344e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 23.616 sec. to 24.616 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00452 ( -1.25554 0.961155 )
Epeak [keV] : 30.4424 ( )
Norm@50keV : 5.02581E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.05 using 59 PHA bins.
# Reduced chi-squared = 0.9831 for 56 degrees of freedom
# Null hypothesis probability = 5.106766e-01
Photon flux (15-150 keV) in 1 sec: 1.43606 ( -0.16994 0.17075 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.45864e-08 ( -1.18424e-08 1.32274e-08 ) ergs/cm2
Band function
Time interval is from 23.616 sec. to 24.616 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.00304 ( -0.869048 1.35884 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 30.4468 ( -8.71256 8.89361 )
Norm@50keV : 5.03563E-02 ( -0.0503563 0.276107 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.05 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 55 degrees of freedom
# Null hypothesis probability = 4.725909e-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] : 8.16888 (-1.04 1.19119)
R^2/D10^2 : 1.52894 (-0.636859 1.09574)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.04 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 57 degrees of freedom
# Null hypothesis probability = 2.432039e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.873e-08 3.570e-09
25- 50 3.398e-08 5.240e-09
50-150 9.553e-09 3.711e-09
15-150 6.226e-08 8.785e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 44.0741 (-11.2687 17.2947)
Norm : 9.09966 (-1.67673 2.21774)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.30 using 59 PHA bins.
# Reduced chi-squared = 0.9701 for 57 degrees of freedom
# Null hypothesis probability = 5.391698e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.154e-08 3.090e-09
25- 50 2.950e-08 4.130e-09
50-150 2.529e-08 8.770e-09
15-150 7.633e-08 1.281e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.27675 (-1.69333 1.7537)
R1^2/D10^2 : 5.83417 (-3.60745 17.9578)
kT2 [keV] : 14.6260 (-4.36813 9.84387)
R2^2/D10^2 : 9.38435E-02 (-0.0843962 0.197312)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.85 using 59 PHA bins.
# Reduced chi-squared = 0.9790 for 55 degrees of freedom
# Null hypothesis probability = 5.187947e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.174e-08 1.180e-08
25- 50 2.941e-08 1.515e-08
50-150 2.425e-08 1.503e-08
15-150 7.539e-08 3.913e-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: 2.11060 ( -0.128374 0.133365 )
Norm@50keV : 5.35810E-03 ( -0.000487756 0.000482017 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.52 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 57 degrees of freedom
# Null hypothesis probability = 2.053230e-01
Photon flux (15-150 keV) in 8.472 sec: 0.847406 ( -0.0593594 0.0593776 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.22198e-07 ( -3.4637e-08 3.5148e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.767936 ( -0.776396 0.658423 )
Epeak [keV] : 36.1255 ( -6.05584 5.31864 )
Norm@50keV : 3.36543E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.39 using 59 PHA bins.
# Reduced chi-squared = 0.9177 for 56 degrees of freedom
# Null hypothesis probability = 6.497130e-01
Photon flux (15-150 keV) in 8.472 sec: 0.807409 ( -0.06147 0.061736 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.73117e-07 ( -3.60382e-08 3.88018e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.529556 ( -0.899173 2.4964 )
beta : -3.04694 ( 3.04398 0.65097 )
Epeak [keV] : 35.0314 ( -7.04224 6.21521 )
Norm@50keV : 4.88679E-02 ( -0.0302405 3.54584 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.29 using 59 PHA bins.
# Reduced chi-squared = 0.9326 for 55 degrees of freedom
# Null hypothesis probability = 6.170117e-01
Photon flux (15-150 keV) in 8.472 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.82158e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.31e-07
S(50-100 keV) = 1.21e-07
T90 vs. Hardness ratio plot
T90 = 7.19599997997284 sec.
Hardness ratio (energy fluence ratio) = 0.923664
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.13031
Count Ratio (50-100 keV) / (15-25 keV) = 0.445114
Mask shadow pattern
IMX = -3.046755108003812E-02, IMY = -2.999984922962267E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 96.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 96.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 96.000000
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:
-239.000000 20.724000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.2216 41.0408 10.9 56.7 -169.3 0.8602 1.1 7.3 Cyg X-3
326.1175 38.3298 11.4 54.5 173.9 0.8614 1.0 2.6 Cyg X-2
10.3417 41.4026 2.4 38.9 131.9 2.1969 4.7 ------ UNKNOWN
351.9341 53.4852 2.3 33.3 159.8 1.4085 5.0 ------ UNKNOWN
74.4451 60.9227 2.2 13.3 34.1 0.9734 5.2 ------ UNKNOWN
68.3104 65.6060 3.0 8.0 39.5 0.6947 3.9 ------ UNKNOWN
127.9744 49.8511 2.6 37.0 -22.1 1.2120 4.5 ------ UNKNOWN
278.9817 50.8805 3.1 53.2 -142.2 4.8038 3.7 ------ UNKNOWN
269.6343 56.2086 3.7 49.2 -133.8 2.9706 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
20.724000 29.196000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
307.9973 40.9430 22.8 56.9 -169.1 0.0675 0.5 5.2 Cyg X-3
326.0339 38.3141 4.6 54.5 174.0 -0.3483 -2.5 6.5 Cyg X-2
31.9307 35.6803 2.4 39.6 103.7 0.5698 4.8 ------ UNKNOWN
44.7845 57.1039 0.5 16.8 95.8 0.8896 24.3 ------ UNKNOWN
300.2826 40.8474 2.7 58.8 -162.6 0.7611 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
144.500600 235.900600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6245 21.9846 0.7 45.1 19.0 3.6014 15.6 1.9 Crab
326.1782 38.4549 9.6 52.7 179.4 -0.4085 -1.2 8.0 Cyg X-2
291.5697 56.0320 3.3 54.8 -144.7 2.0520 3.5 ------ UNKNOWN
Plot creation:
Sat May 30 21:14:44 EDT 2015