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
328.3688 43.9999 0.0110 47.7285 -170.2495 2.0550801 17.597 TRIG_00208050
Foreground time interval of the image:
-10.116 30.152 (delta_t = 40.268 [sec])
Background time interval of the image:
-204.531 -10.116 (delta_t = 194.415 [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 -10.116 sec. to 30.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49938 ( -0.148855 0.149719 )
Norm@50keV : 3.65147E-03 ( -0.000304542 0.000303812 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.26 using 59 PHA bins.
# Reduced chi-squared = 0.8993 for 57 degrees of freedom
# Null hypothesis probability = 6.892166e-01
Photon flux (15-150 keV) in 40.27 sec: 0.455770 ( -0.0400485 0.040247 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39507e-06 ( -1.24486e-07 1.252e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.116 sec. to 30.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28476 ( -0.588122 0.216807 )
Epeak [keV] : 104.135 ( -400.217 -400.217 )
Norm@50keV : 1.26656E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.95 using 59 PHA bins.
# Reduced chi-squared = 0.8919 for 56 degrees of freedom
# Null hypothesis probability = 7.020130e-01
Photon flux (15-150 keV) in 40.27 sec: 0.453811 ( -0.041966 0.02098 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39029e-06 ( -1.30644e-07 6.57287e-08 ) ergs/cm2
Band function
Time interval is from -10.116 sec. to 30.152 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30752 ( 1.30754 1.30754 )
beta : -1.49931 ( -0.149652 0.148876 )
Epeak [keV] : 36.9491 ( -36.9364 -36.9364 )
Norm@50keV : 5.99727E-03 ( -0.0026465 0.0556249 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.26 using 59 PHA bins.
# Reduced chi-squared = 0.9320 for 55 degrees of freedom
# Null hypothesis probability = 6.182559e-01
Photon flux (15-150 keV) in 40.27 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] : 16.8058 (-1.81392 2.07227)
R^2/D10^2 : 3.42379E-02 (-0.0114619 0.0169578)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.38 using 59 PHA bins.
# Reduced chi-squared = 1.586 for 57 degrees of freedom
# Null hypothesis probability = 3.213733e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.955e-08 1.371e-08
25- 50 3.488e-07 3.983e-08
50-150 7.007e-07 1.105e-07
15-150 1.129e-06 1.236e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.87176 (-0.155037 0.155024)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.59 using 59 PHA bins.
# Reduced chi-squared = 0.9226 for 57 degrees of freedom
# Null hypothesis probability = 6.411474e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.877e-07 1.995e-08
25- 50 3.611e-07 5.318e-08
50-150 7.919e-07 3.162e-07
15-150 1.341e-06 2.920e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.64571 (-2.23462 2.33541)
R1^2/D10^2 : 0.558417 (-0.357052 2.02256)
kT2 [keV] : 27.2630 (-5.87832 10.7451)
R2^2/D10^2 : 5.32129E-03 (-0.00360396 0.0042957)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.71 using 59 PHA bins.
# Reduced chi-squared = 0.9583 for 55 degrees of freedom
# Null hypothesis probability = 5.626555e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.771e-07 8.323e-08
25- 50 3.423e-07 1.230e-07
50-150 8.708e-07 3.352e-07
15-150 1.390e-06 5.142e-07
Peak spectrum fit
Power-law model
Time interval is from 0.376 sec. to 1.376 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.960651 ( -0.219809 0.209985 )
Norm@50keV : 1.75182E-02 ( -0.00228435 0.00224853 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.01 using 59 PHA bins.
# Reduced chi-squared = 1.333 for 57 degrees of freedom
# Null hypothesis probability = 4.700213e-02
Photon flux (15-150 keV) in 1 sec: 2.01349 ( -0.26504 0.266626 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92147e-07 ( -2.39104e-08 2.39437e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.376 sec. to 1.376 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.655532 ( -0.955812 0.440416 )
Epeak [keV] : 275.432 ( -260.969 -260.969 )
Norm@50keV : 2.31411E-02 ( -0.00824632 0.0292056 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.51 using 59 PHA bins.
# Reduced chi-squared = 1.348 for 56 degrees of freedom
# Null hypothesis probability = 4.216732e-02
Photon flux (15-150 keV) in 1 sec: 1.98435 ( -0.27327 0.27478 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.91538e-07 ( -2.4218e-08 2.4153e-08 ) ergs/cm2
Band function
Time interval is from 0.376 sec. to 1.376 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.99999 -4.99999 )
beta : -0.987651 ( -0.236563 0.235313 )
Epeak [keV] : 26.2445 ( -26.2445 65.0492 )
Norm@50keV : 854.962 ( -102.906 3.45336e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.76 using 59 PHA bins.
# Reduced chi-squared = 1.377 for 55 degrees of freedom
# Null hypothesis probability = 3.318487e-02
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] : 26.3203 (-3.94154 5.06757)
R^2/D10^2 : 4.23581E-02 (-0.0176813 0.0281931)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.25 using 59 PHA bins.
# Reduced chi-squared = 1.478 for 57 degrees of freedom
# Null hypothesis probability = 1.096054e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.957e-09 1.238e-09
25- 50 2.885e-08 6.485e-09
50-150 1.468e-07 2.660e-08
15-150 1.806e-07 2.985e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 8.56087 (-1.1007 1.10052)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 98.65 using 59 PHA bins.
# Reduced chi-squared = 1.731 for 57 degrees of freedom
# Null hypothesis probability = 5.154968e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.133e-08 1.205e-08
25- 50 4.102e-08 2.278e-08
50-150 8.997e-08 4.988e-08
15-150 1.523e-07 8.370e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.97523 (-2.88343 4.36658)
R1^2/D10^2 : 1.36420 (-1.10541 9.89731)
kT2 [keV] : 33.8306 (-7.13218 14.5358)
R2^2/D10^2 : 1.78834E-02 (-0.011795 0.0173445)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.26 using 59 PHA bins.
# Reduced chi-squared = 1.332 for 55 degrees of freedom
# Null hypothesis probability = 5.042474e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.359e-08 7.639e-09
25- 50 3.360e-08 1.471e-08
50-150 1.487e-07 7.602e-08
15-150 1.959e-07 8.607e-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: 1.49938 ( -0.148855 0.149719 )
Norm@50keV : 3.65147E-03 ( -0.000304542 0.000303812 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.26 using 59 PHA bins.
# Reduced chi-squared = 0.8993 for 57 degrees of freedom
# Null hypothesis probability = 6.892166e-01
Photon flux (15-150 keV) in 40.27 sec: 0.455770 ( -0.0400485 0.040247 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39507e-06 ( -1.24486e-07 1.252e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28476 ( -0.588122 0.216807 )
Epeak [keV] : 104.135 ( -400.217 -400.217 )
Norm@50keV : 1.26656E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.95 using 59 PHA bins.
# Reduced chi-squared = 0.8919 for 56 degrees of freedom
# Null hypothesis probability = 7.020130e-01
Photon flux (15-150 keV) in 40.27 sec: 0.453811 ( -0.041966 0.02098 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39029e-06 ( -1.30644e-07 6.57287e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30752 ( 1.30754 1.30754 )
beta : -1.49931 ( -0.149652 0.148876 )
Epeak [keV] : 36.9491 ( -36.9364 -36.9364 )
Norm@50keV : 5.99727E-03 ( -0.0026465 0.0556249 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.26 using 59 PHA bins.
# Reduced chi-squared = 0.9320 for 55 degrees of freedom
# Null hypothesis probability = 6.182559e-01
Photon flux (15-150 keV) in 40.27 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) = 3.45e-07
S(50-100 keV) = 4.88e-07
T90 vs. Hardness ratio plot
T90 = 25.6280000209808 sec.
Hardness ratio (energy fluence ratio) = 1.41449
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.49922
Count Ratio (50-100 keV) / (15-25 keV) = 1.27739
Mask shadow pattern
IMX = -1.084193585495419E+00, IMY = 1.863087079026394E-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:
-204.531410 -10.116000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.0740 40.9763 3.7 55.5 173.0 -2.2912 -3.2 2.2 Cyg X-3
326.1933 38.4692 4.5 43.9 -176.3 0.6152 2.6 8.9 Cyg X-2
330.4134 0.2673 3.0 19.4 120.7 0.6096 3.8 ------ UNKNOWN
7.0632 44.8275 3.4 47.1 -132.8 1.7126 3.3 ------ UNKNOWN
40.3599 -13.3735 4.2 51.9 -42.2 2.1821 2.7 ------ UNKNOWN
39.4000 -11.2282 3.7 50.6 -44.7 2.4745 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-10.116000 30.152000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.1063 40.8830 8.5 55.4 172.9 -0.4333 -1.4 4.2 Cyg X-3
326.3366 38.3368 7.6 43.8 -176.3 -0.1539 -1.5 7.8 Cyg X-2
7.4713 -27.0725 2.3 32.2 -0.0 0.3697 4.9 ------ UNKNOWN
12.2701 -28.2507 2.8 35.7 -4.7 0.3336 4.1 ------ UNKNOWN
26.6375 -41.3927 2.3 53.3 -3.6 0.9066 5.0 ------ UNKNOWN
328.3688 43.9999 0.7 47.7 -170.2 2.0547 17.6 ------ UNKNOWN
36.3362 -35.4559 2.7 56.1 -14.9 1.0296 4.3 ------ UNKNOWN
34.6312 -25.8687 2.1 50.5 -24.8 0.7965 5.4 ------ UNKNOWN
347.7961 53.4649 2.0 53.3 -150.9 1.2558 5.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
296.868600 963.088700
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5314 -40.5438 0.3 9.9 93.6 11.5521 36.5 0.7 Vela X-1
170.0642 -60.6731 11.4 37.3 124.1 -0.8936 -1.0 8.0 Cen X-3
145.4657 -30.7092 2.3 19.2 56.8 1.7826 5.0 ------ UNKNOWN
144.2321 8.7224 3.0 49.8 7.2 3.3732 3.9 ------ UNKNOWN
128.3977 -15.8792 3.5 21.7 -7.3 1.1476 3.3 ------ UNKNOWN
126.6501 19.1022 5.2 56.3 -16.5 3.3894 2.2 ------ UNKNOWN
Plot creation:
Sun May 31 13:27:39 EDT 2015