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
29.6413 41.6360 0.0167 46.3187 -15.2023 1.7781422 11.608 TRIG_00358574
Foreground time interval of the image:
-15.912 37.789 (delta_t = 53.701 [sec])
Background time interval of the image:
-239.912 -15.912 (delta_t = 224.000 [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 4.096000
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 4.096000
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 4.096000
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 -15.912 sec. to 64.088 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92237 ( -0.243484 0.259919 )
Norm@50keV : 1.48135E-03 ( -0.000241629 0.000234608 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.74 using 59 PHA bins.
# Reduced chi-squared = 0.9955 for 57 degrees of freedom
# Null hypothesis probability = 4.847326e-01
Photon flux (15-150 keV) in 80 sec: 0.214637 ( -0.0295287 0.0295606 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08986e-06 ( -1.70589e-07 1.7353e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.912 sec. to 64.088 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55581 ( -1.03588 0.636783 )
Epeak [keV] : 55.8001 ( -55.7478 -55.8 )
Norm@50keV : 2.34152E-03 ( -0.00129842 0.00601809 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.22 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 56 degrees of freedom
# Null hypothesis probability = 4.666552e-01
Photon flux (15-150 keV) in 80 sec: 0.211642 ( -0.030378 0.030339 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0622e-06 ( -1.81928e-07 1.85216e-07 ) ergs/cm2
Band function
Time interval is from -15.912 sec. to 64.088 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.55665 ( 1.70204 1.17462 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 55.8178 ( -40.4608 -55.8178 )
Norm@50keV : 2.33856E-03 ( -0.00106187 0.0060432 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.22 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 55 degrees of freedom
# Null hypothesis probability = 4.290190e-01
Photon flux (15-150 keV) in 80 sec: 0.210981 ( 6.78902 -0.028726 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06226e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.6643 (-1.95521 2.29139)
R^2/D10^2 : 5.55545E-02 (-0.0270012 0.0547143)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.02 using 59 PHA bins.
# Reduced chi-squared = 1.246 for 57 degrees of freedom
# Null hypothesis probability = 1.002789e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.275e-07 3.994e-08
25- 50 3.880e-07 7.640e-08
50-150 3.113e-07 1.013e-07
15-150 8.268e-07 1.554e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 83.1246 (-29.6992 62.0203)
Norm : 0.992430 (-0.188609 0.246274)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.44 using 59 PHA bins.
# Reduced chi-squared = 0.9902 for 57 degrees of freedom
# Null hypothesis probability = 4.959650e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.065e-07 3.900e-08
25- 50 3.430e-07 5.584e-08
50-150 4.966e-07 2.646e-07
15-150 1.046e-06 3.091e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.42331 (-1.35726 2.07775)
R1^2/D10^2 : 1.56802 (-1.23594 7.43415)
kT2 [keV] : 17.6519 (-4.06359 7.29248)
R2^2/D10^2 : 9.62908E-03 (-0.0071772 0.0174499)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.93 using 59 PHA bins.
# Reduced chi-squared = 0.9987 for 55 degrees of freedom
# Null hypothesis probability = 4.773262e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.303e-07 1.303e-07
25- 50 3.071e-07 1.391e-07
50-150 4.976e-07 2.926e-07
15-150 1.035e-06 4.621e-07
Peak spectrum fit
Power-law model
Time interval is from 7.588 sec. to 8.588 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.72465 ( -2.72465 -2.72465 )
Norm@50keV : 1.10113E-03 ( -0.00110113 0.00230534 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.92 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 57 degrees of freedom
# Null hypothesis probability = 1.525725e-01
Photon flux (15-150 keV) in 1 sec: 0.249818 ( -0.249818 0.273504 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18167e-08 ( -1.18167e-08 1.96916e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.588 sec. to 8.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87721 ( )
Epeak [keV] : 4.75197 ( )
Norm@50keV : 4.02746E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.94 using 59 PHA bins.
# Reduced chi-squared = 1.213 for 56 degrees of freedom
# Null hypothesis probability = 1.316334e-01
Photon flux (15-150 keV) in 1 sec: 0.249167 ( -0.249167 0.273644 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16651e-08 ( -1.16651e-08 1.96522e-08 ) ergs/cm2
Band function
Time interval is from 7.588 sec. to 8.588 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.91988 ( )
beta : -9.37166 ( )
Epeak [keV] : 3.74286 ( )
Norm@50keV : 3.46752E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.94 using 59 PHA bins.
# Reduced chi-squared = 1.235 for 55 degrees of freedom
# Null hypothesis probability = 1.129637e-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] : 3.97162 (-3.97153 -3.97153)
R^2/D10^2 : 6.10031 (-6.10095 -6.10095)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.05 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 57 degrees of freedom
# Null hypothesis probability = 1.501197e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.359e-09 3.607e-09
25- 50 1.896e-09 1.661e-09
50-150 2.207e-11 4.295e-11
15-150 7.278e-09 5.145e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 22.8080 (-22.9529 -22.9529)
Norm : 2.57772 (-2.55608 -2.55608)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.97 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 57 degrees of freedom
# Null hypothesis probability = 1.516145e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.433e-09 3.209e-09
25- 50 4.273e-09 3.517e-09
50-150 1.582e-09 2.225e-09
15-150 1.029e-08 9.100e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.45767 (-3.39675 -3.39675)
R1^2/D10^2 : 9.89982 (-10.3695 -10.3695)
kT2 [keV] : 13.6313 (-13.4964 -13.4964)
R2^2/D10^2 : 1.82606E-02 (-0.0188514 -0.0188514)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.68 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 55 degrees of freedom
# Null hypothesis probability = 1.170942e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.962e-09 2.607e-09
25- 50 3.591e-09 3.223e-09
50-150 3.142e-09 2.661e-09
15-150 1.169e-08 9.910e-09
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: 1.85004 ( -0.23398 0.247235 )
Norm@50keV : 2.00333E-03 ( -0.000304939 0.000297516 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.48 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.854573e-01
Photon flux (15-150 keV) in 53.7 sec: 0.281593 ( -0.0378859 0.0379423 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.8917e-07 ( -1.48789e-07 1.50924e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46217 ( -1.02261 0.769181 )
Epeak [keV] : 65.7158 ( -65.6482 -65.7158 )
Norm@50keV : 3.21774E-03 ( -0.00321774 0.00773816 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.89 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 56 degrees of freedom
# Null hypothesis probability = 3.703453e-01
Photon flux (15-150 keV) in 53.7 sec: 0.277244 ( -0.039156 0.039078 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.64302e-07 ( -1.58571e-07 1.60654e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.46105 ( -4.44063 1.11534 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 65.5962 ( -38.1981 -65.5982 )
Norm@50keV : 3.22258E-03 ( -0.00140016 0.00773541 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.89 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 55 degrees of freedom
# Null hypothesis probability = 3.352751e-01
Photon flux (15-150 keV) in 53.7 sec: 0.276159 ( 6.72384 -0.036652 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.63518e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 3.20e-07
S(50-100 keV) = 3.38e-07
T90 vs. Hardness ratio plot
T90 = 64 sec.
Hardness ratio (energy fluence ratio) = 1.05625
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.01233
Count Ratio (50-100 keV) / (15-25 keV) = 0.668562
Mask shadow pattern
IMX = 1.010480728020026E+00, IMY = 2.745854694665011E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-239.912000 -15.912000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4666 35.3864 3.2 46.4 163.6 1.8631 3.6 2.7 Her X-1
299.5904 35.1892 0.4 31.3 108.4 11.3838 30.0 0.7 Cyg X-1
308.0421 41.0875 3.1 24.3 96.7 1.0216 3.7 8.7 Cyg X-3
326.2648 38.2769 5.0 27.3 64.2 0.6346 2.3 5.1 Cyg X-2
269.3530 69.9605 2.6 18.1 -151.3 0.8522 4.5 ------ UNKNOWN
30.1512 62.5480 2.8 31.0 -38.5 1.0133 4.2 ------ UNKNOWN
214.5007 40.0997 3.8 58.7 -159.2 5.6279 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-15.912000 37.788600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4948 35.3142 4.8 46.5 163.5 -0.4499 -2.4 2.5 Her X-1
299.4941 35.2184 5.9 31.3 108.5 -0.2842 -2.0 4.8 Cyg X-1
307.9268 40.8076 0.0 24.5 96.8 0.1995 1.7 12.0 Cyg X-3
326.1626 38.4747 9.7 27.1 64.3 0.1362 1.2 9.2 Cyg X-2
263.0012 25.8870 2.5 51.3 149.0 1.9504 4.5 ------ UNKNOWN
29.6413 41.6359 1.0 46.3 -15.2 1.7786 11.6 ------ UNKNOWN
215.5360 45.9595 2.1 53.3 -156.4 1.2711 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
99.788600 962.193500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
323.9581 46.4829 4.1 46.1 139.2 5.1845 2.8 ------ UNKNOWN
248.7138 78.5284 3.2 57.6 -168.8 9.3524 3.7 ------ UNKNOWN
97.8304 61.3920 4.2 44.2 -120.7 5.8946 2.8 ------ UNKNOWN
Plot creation:
Sun May 31 03:22:56 EDT 2015