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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
70.4827 -12.2552 0.0131 25.9087 112.3782 1.5030198 14.639 TRIG_00536580
Foreground time interval of the image:
-8.296 29.029 (delta_t = 37.325 [sec])
Background time interval of the image:
-202.371 -8.296 (delta_t = 194.075 [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 1.408000
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 1.408000
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 1.408000
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 -8.296 sec. to 74.072 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32212 ( -0.222576 0.220363 )
Norm@50keV : 1.35570E-03 ( -0.000161861 0.00016117 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.11 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 57 degrees of freedom
# Null hypothesis probability = 3.982528e-01
Photon flux (15-150 keV) in 82.37 sec: 0.162416 ( -0.0193796 0.0194203 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09766e-06 ( -1.49868e-07 1.52098e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.296 sec. to 74.072 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32218 ( -0.227202 1.51242 )
Epeak [keV] : 9999.23 ( -9999.35 -9999.35 )
Norm@50keV : 1.36054E-03 ( -0.00136062 0.000847223 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.13 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 56 degrees of freedom
# Null hypothesis probability = 3.619606e-01
Photon flux (15-150 keV) in 82.37 sec: 0.162641 ( -0.019622 0.019183 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09812e-06 ( -1.49848e-07 1.47096e-07 ) ergs/cm2
Band function
Time interval is from -8.296 sec. to 74.072 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97383 ( -4.97383 -4.97383 )
beta : -1.39150 ( -0.256534 0.244073 )
Epeak [keV] : 23.6157 ( -23.6157 71.0432 )
Norm@50keV : 169.154 ( -19.7883 493689 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.87 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 55 degrees of freedom
# Null hypothesis probability = 3.697665e-01
Photon flux (15-150 keV) in 82.37 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] : 16.8075 (-3.25058 4.28717)
R^2/D10^2 : 1.22498E-02 (-0.006375 0.0130473)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.35 using 59 PHA bins.
# Reduced chi-squared = 1.533 for 57 degrees of freedom
# Null hypothesis probability = 5.976859e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.823e-08 1.362e-08
25- 50 2.553e-07 4.407e-08
50-150 5.130e-07 1.321e-07
15-150 8.265e-07 1.471e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 0.664865 (-0.0789062 0.0789009)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.36 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 57 degrees of freedom
# Null hypothesis probability = 2.620646e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.364e-07 7.673e-08
25- 50 2.623e-07 1.451e-07
50-150 5.753e-07 3.152e-07
15-150 9.740e-07 5.362e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.87447 (-1.73867 1.4629)
R1^2/D10^2 : 0.196931 (-0.124773 0.370649)
kT2 [keV] : 39.5633 (-13.1109 49.8382)
R2^2/D10^2 : 7.17556E-04 (-0.000606964 0.000953398)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.11 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 55 degrees of freedom
# Null hypothesis probability = 4.330045e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.328e-07 6.386e-08
25- 50 2.415e-07 1.071e-07
50-150 7.961e-07 4.100e-07
15-150 1.170e-06 5.215e-07
Peak spectrum fit
Power-law model
Time interval is from 0.644 sec. to 1.644 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06926 ( -0.311629 0.300485 )
Norm@50keV : 1.18336E-02 ( -0.00189477 0.00189335 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.88 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.424354e-01
Photon flux (15-150 keV) in 1 sec: 1.36884 ( -0.222509 0.222986 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24964e-07 ( -2.30166e-08 2.333e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.644 sec. to 1.644 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07664 ( -0.442587 0.291308 )
Epeak [keV] : 9999.34 ( -9999.36 -9999.36 )
Norm@50keV : 1.18484E-02 ( -0.00190197 0.00190348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.91 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 56 degrees of freedom
# Null hypothesis probability = 4.047191e-01
Photon flux (15-150 keV) in 1 sec: 1.37124 ( -0.22412 0.22053 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24976e-07 ( -2.3019e-08 2.269e-08 ) ergs/cm2
Band function
Time interval is from 0.644 sec. to 1.644 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.889265 ( 0.889265 0.889265 )
beta : -1.06926 ( 1.06926 0.311634 )
Epeak [keV] : 53.6913 ( -53.6913 -53.6913 )
Norm@50keV : 1.94080E-02 ( -0.00863593 1.84628 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.88 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 55 degrees of freedom
# Null hypothesis probability = 3.693115e-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] : 22.0703 (-5.66855 8.46904)
R^2/D10^2 : 4.58611E-02 (-0.0279753 0.0699813)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.08 using 59 PHA bins.
# Reduced chi-squared = 1.265 for 57 degrees of freedom
# Null hypothesis probability = 8.603785e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.128e-09 1.556e-09
25- 50 2.187e-08 6.100e-09
50-150 7.960e-08 2.613e-08
15-150 1.056e-07 3.061e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.48947 (-0.911644 0.911619)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.50 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 57 degrees of freedom
# Null hypothesis probability = 2.057620e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.367e-08 7.875e-09
25- 50 2.630e-08 1.497e-08
50-150 5.768e-08 3.288e-08
15-150 9.766e-08 5.570e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.22539 (-2.69288 4.20472)
R1^2/D10^2 : 1.18123 (-0.913192 3.46442)
kT2 [keV] : 46.0652 (-18.713 -46.0674)
R2^2/D10^2 : 4.86184E-03 (-0.00459515 0.0163331)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.47 using 59 PHA bins.
# Reduced chi-squared = 1.027 for 55 degrees of freedom
# Null hypothesis probability = 4.198706e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.142e-08 6.615e-09
25- 50 2.338e-08 1.260e-08
50-150 9.831e-08 5.370e-08
15-150 1.331e-07 7.075e-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: 1.39742 ( -0.185194 0.185373 )
Norm@50keV : 2.66758E-03 ( -0.000273462 0.00027168 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.88 using 59 PHA bins.
# Reduced chi-squared = 0.6646 for 57 degrees of freedom
# Null hypothesis probability = 9.760160e-01
Photon flux (15-150 keV) in 37.32 sec: 0.324671 ( -0.0326359 0.0326898 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.62464e-07 ( -1.11893e-07 1.1343e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39434 ( -0.199566 0.186591 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.67705E-03 ( -0.002677 0.00170747 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.90 using 59 PHA bins.
# Reduced chi-squared = 0.6767 for 56 degrees of freedom
# Null hypothesis probability = 9.696252e-01
Photon flux (15-150 keV) in 37.32 sec: 0.324834 ( -0.032774 0.032423 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.57467e-07 ( -1.07504e-07 1.17207e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.84931 ( -4.84931 -4.84931 )
beta : -1.44581 ( -0.21032 0.200843 )
Epeak [keV] : 22.3204 ( -22.3204 6.20525 )
Norm@50keV : 396.754 ( -39.301 1.13892e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.41 using 59 PHA bins.
# Reduced chi-squared = 0.6801 for 55 degrees of freedom
# Null hypothesis probability = 9.666647e-01
Photon flux (15-150 keV) in 37.32 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) = 2.47e-07
S(50-100 keV) = 3.96e-07
T90 vs. Hardness ratio plot
T90 = 67.9679999947548 sec.
Hardness ratio (energy fluence ratio) = 1.60324
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.1757
Count Ratio (50-100 keV) / (15-25 keV) = 0.960132
Mask shadow pattern
IMX = -1.849384243682249E-01, IMY = -4.491802623731363E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.408000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.408000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.408000
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:
-202.371400 -8.296000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6550 -40.7005 13.9 42.4 -110.9 0.7443 0.8 10.5 Vela X-1
45.9876 -11.8437 2.7 39.8 75.2 3.2313 4.3 ------ UNKNOWN
101.5159 -59.4350 2.4 26.6 -67.8 1.0239 4.8 ------ UNKNOWN
131.4721 -0.9178 4.2 58.7 -159.3 3.2039 2.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-8.296000 29.028580
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4003 -40.6498 7.7 42.2 -111.1 -0.4264 -1.5 8.2 Vela X-1
25.0928 -26.6538 2.5 47.8 41.2 1.5430 4.6 ------ UNKNOWN
70.4827 -12.2552 0.8 25.9 112.4 1.5028 14.6 ------ UNKNOWN
80.4024 -27.8811 2.1 8.6 133.8 0.3851 5.4 ------ UNKNOWN
358.8342 -59.6017 2.5 55.3 -6.5 1.1498 4.6 ------ UNKNOWN
122.4259 -43.7122 2.3 32.3 -108.0 0.5498 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
81.628590 679.528600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6244 22.0186 0.3 36.7 172.1 23.8301 39.0 0.5 Crab
26.1667 -41.0803 2.9 48.2 16.4 4.4034 3.9 ------ UNKNOWN
116.5451 25.6893 3.5 58.8 -159.2 9.3850 3.3 ------ UNKNOWN
59.1574 -70.7769 4.8 58.9 -24.3 9.0830 2.4 ------ UNKNOWN
63.2784 -70.8676 3.2 58.7 -25.8 12.7232 3.6 ------ UNKNOWN
119.6492 13.5274 8.4 55.2 -144.9 4.1362 1.4 ------ UNKNOWN
93.4911 -61.6342 4.6 52.1 -42.2 6.3582 2.5 ------ UNKNOWN
117.6997 0.4169 2.7 48.5 -130.3 8.0827 4.3 ------ UNKNOWN
Plot creation:
Sat May 30 18:05:21 EDT 2015