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
338.5943 38.6847 0.0066 39.1591 42.6777 5.6777049 28.986 TRIG_00146227
Foreground time interval of the image:
-13.676 30.037 (delta_t = 43.713 [sec])
Background time interval of the image:
-299.264 -13.676 (delta_t = 285.588 [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 2.048000
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 2.048000
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 2.048000
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 -13.676 sec. to 76.388 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34036 ( -0.0607487 0.060376 )
Norm@50keV : 7.18035E-03 ( -0.000248932 0.000248859 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.35 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 57 degrees of freedom
# Null hypothesis probability = 4.254947e-01
Photon flux (15-150 keV) in 90.06 sec: 0.863327 ( -0.0325717 0.0326548 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.32961e-06 ( -2.28537e-07 2.28807e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -13.676 sec. to 76.388 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.788979 ( -0.270334 0.254423 )
Epeak [keV] : 122.331 ( -22.908 55.5365 )
Norm@50keV : 1.28050E-02 ( -0.00292424 0.00403891 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.73 using 59 PHA bins.
# Reduced chi-squared = 0.7809 for 56 degrees of freedom
# Null hypothesis probability = 8.835406e-01
Photon flux (15-150 keV) in 90.06 sec: 0.837325 ( -0.034439 0.034524 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.15204e-06 ( -2.4644e-07 2.44783e-07 ) ergs/cm2
Band function
Time interval is from -13.676 sec. to 76.388 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.179654 ( -0.801853 2.90614 )
beta : -1.56285 ( 1.5647 0.149962 )
Epeak [keV] : 68.3709 ( -34.8149 92.6373 )
Norm@50keV : 2.98621E-02 ( -0.0177421 3.54897 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.87 using 59 PHA bins.
# Reduced chi-squared = 0.7795 for 55 degrees of freedom
# Null hypothesis probability = 8.828535e-01
Photon flux (15-150 keV) in 90.06 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.15982e-06 ( -6.15919e-06 -2.41199e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.3221 ( )
R^2/D10^2 : 5.10156E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 163.94 using 59 PHA bins.
# Reduced chi-squared = 2.8761 for 57 degrees of freedom
# Null hypothesis probability = 2.766933e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.070e-07 2.112e-08
25- 50 1.439e-06 7.385e-08
50-150 3.521e-06 1.864e-07
15-150 5.267e-06 2.184e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.66350 (-0.127365 0.127309)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.69 using 59 PHA bins.
# Reduced chi-squared = 1.538 for 57 degrees of freedom
# Null hypothesis probability = 5.582954e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.215e-07 3.278e-08
25- 50 1.580e-06 6.574e-08
50-150 3.466e-06 1.283e-07
15-150 5.868e-06 2.310e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.53755 (-1.22166 1.36972)
R1^2/D10^2 : 0.382900 (-0.133723 0.233102)
kT2 [keV] : 29.0717 (-3.53745 5.5185)
R2^2/D10^2 : 8.37765E-03 (-0.00388929 0.00523531)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.52 using 59 PHA bins.
# Reduced chi-squared = 0.7731 for 55 degrees of freedom
# Null hypothesis probability = 8.905102e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.767e-07 8.295e-08
25- 50 1.547e-06 1.400e-07
50-150 4.039e-06 5.827e-07
15-150 6.163e-06 6.962e-07
Peak spectrum fit
Power-law model
Time interval is from 12.220 sec. to 13.220 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41115 ( -0.252059 0.248371 )
Norm@50keV : 1.74255E-02 ( -0.00270609 0.00270165 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.00 using 59 PHA bins.
# Reduced chi-squared = 0.8070 for 57 degrees of freedom
# Null hypothesis probability = 8.511634e-01
Photon flux (15-150 keV) in 1 sec: 2.12752 ( -0.343704 0.34472 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67998e-07 ( -2.77559e-08 2.79116e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 12.220 sec. to 13.220 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.941522 ( -1.11383 0.812619 )
Epeak [keV] : 116.280 ( -52.426 -116.28 )
Norm@50keV : 2.99868E-02 ( -0.0147869 0.0749502 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.24 using 59 PHA bins.
# Reduced chi-squared = 0.8079 for 56 degrees of freedom
# Null hypothesis probability = 8.475965e-01
Photon flux (15-150 keV) in 1 sec: 2.10453 ( -0.17544 0.34787 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6445e-07 ( -2.9354e-08 2.9002e-08 ) ergs/cm2
Band function
Time interval is from 12.220 sec. to 13.220 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.91556 ( -4.91556 -4.91556 )
beta : -1.61616 ( -0.470579 0.317667 )
Epeak [keV] : 29.6069 ( -29.6069 8.61081 )
Norm@50keV : 568.421 ( -87.0482 6.56166e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.58 using 59 PHA bins.
# Reduced chi-squared = 0.7924 for 55 degrees of freedom
# Null hypothesis probability = 8.664396e-01
Photon flux (15-150 keV) in 1 sec: 2.10704 ( 4.89296 -0.35432 ) 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] : 15.9623 (-3.04893 3.94472)
R^2/D10^2 : 0.202661 (-0.109527 0.225809)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.81 using 59 PHA bins.
# Reduced chi-squared = 0.9616 for 57 degrees of freedom
# Null hypothesis probability = 5.575636e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.068e-08 3.675e-09
25- 50 4.486e-08 1.059e-08
50-150 7.982e-08 2.465e-08
15-150 1.354e-07 2.995e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 8.90997 (-1.38113 1.38099)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.27 using 59 PHA bins.
# Reduced chi-squared = 0.8118 for 57 degrees of freedom
# Null hypothesis probability = 8.442169e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.219e-08 1.280e-08
25- 50 4.269e-08 2.424e-08
50-150 9.362e-08 5.225e-08
15-150 1.585e-07 9.045e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.68830 (-2.86169 3.66925)
R1^2/D10^2 : 1.16260 (-0.774246 2.97247)
kT2 [keV] : 34.3692 (-27.9176 -34.35)
R2^2/D10^2 : 1.07687E-02 (-0.0105265 0.0520172)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.39 using 59 PHA bins.
# Reduced chi-squared = 0.7889 for 55 degrees of freedom
# Null hypothesis probability = 8.710256e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.858e-08 1.057e-08
25- 50 4.553e-08 2.484e-08
50-150 1.041e-07 5.925e-08
15-150 1.682e-07 8.635e-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: 1.23796 ( -0.0747097 0.0739219 )
Norm@50keV : 9.42373E-03 ( -0.000412465 0.000411999 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.90 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 57 degrees of freedom
# Null hypothesis probability = 3.373329e-01
Photon flux (15-150 keV) in 43.71 sec: 1.11242 ( -0.0523588 0.0525266 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.13559e-06 ( -1.85492e-07 1.85718e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.516322 ( -0.356104 0.328957 )
Epeak [keV] : 117.251 ( -21.0971 49.575 )
Norm@50keV : 1.97562E-02 ( -0.00552408 0.00833497 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.63 using 59 PHA bins.
# Reduced chi-squared = 0.8149 for 56 degrees of freedom
# Null hypothesis probability = 8.372888e-01
Photon flux (15-150 keV) in 43.71 sec: 1.07282 ( -0.05497 0.05515 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.00565e-06 ( -1.98588e-07 1.97705e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.66274E-02 ( -0.751977 1.71592 )
beta : -1.58281 ( 1.58188 0.207071 )
Epeak [keV] : 79.2676 ( -31.699 71.438 )
Norm@50keV : 3.74511E-02 ( -0.0225855 0.439416 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.59 using 59 PHA bins.
# Reduced chi-squared = 0.8107 for 55 degrees of freedom
# Null hypothesis probability = 8.410225e-01
Photon flux (15-150 keV) in 43.71 sec: ( ) 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) = 1.44e-06
S(50-100 keV) = 2.28e-06
T90 vs. Hardness ratio plot
T90 = 69.0200000107288 sec.
Hardness ratio (energy fluence ratio) = 1.58333
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.75287
Count Ratio (50-100 keV) / (15-25 keV) = 1.56575
Mask shadow pattern
IMX = 5.987233751923549E-01, IMY = -5.520548339040845E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-299.264000 -13.676000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.1998 40.7858 7.6 36.6 80.9 0.9171 1.5 10.8 Cyg X-3
326.1587 38.3041 40.1 38.8 58.2 0.1764 0.3 1.2 Cyg X-2
9.0027 61.7834 3.4 21.7 -7.8 0.7329 3.4 ------ UNKNOWN
95.6953 74.9287 2.9 25.9 -89.9 1.0925 3.9 ------ UNKNOWN
69.5988 49.8086 3.0 45.8 -56.5 4.1784 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-13.676000 30.036580
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.3222 41.0715 0.0 36.4 80.8 0.2240 1.0 12.0 Cyg X-3
326.0374 38.2134 10.1 38.9 58.3 0.2822 1.1 9.1 Cyg X-2
338.5944 38.6847 0.4 39.2 42.7 5.6766 29.0 ------ UNKNOWN
359.4052 66.3542 2.2 15.7 -3.3 0.4044 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
85.436600 302.787000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.6067 35.1851 0.6 31.1 144.3 5.2865 20.7 1.3 Cyg X-1
308.1175 40.9616 1.2 23.4 153.8 1.8893 9.8 0.6 Cyg X-3
325.9104 38.2809 0.0 9.9 140.1 -0.2520 -1.6 12.5 Cyg X-2
255.2353 57.8840 3.1 54.7 -171.8 2.3228 3.8 ------ UNKNOWN
331.3209 58.3015 2.8 20.2 -142.7 0.6440 4.1 ------ UNKNOWN
Plot creation:
Sun May 31 16:31:52 EDT 2015