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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
177.2069 -19.4818 0.0026 18.0276 -25.8857 3.9263866 74.383 TRIG_00424733
Foreground time interval of the image:
-0.044 11.613 (delta_t = 11.657 [sec])
Background time interval of the image:
-239.888 -0.044 (delta_t = 239.844 [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 0.512000
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 0.512000
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 0.512000
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 -0.044 sec. to 47.408 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86399 ( -0.0434578 0.04362 )
Norm@50keV : 1.12668E-02 ( -0.000239243 0.000239071 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.90 using 59 PHA bins.
# Reduced chi-squared = 0.9104 for 57 degrees of freedom
# Null hypothesis probability = 6.664824e-01
Photon flux (15-150 keV) in 47.45 sec: 1.59275 ( -0.0399701 0.0402077 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.91492e-06 ( -1.04571e-07 1.0467e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.044 sec. to 47.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64578 ( -0.178634 0.171862 )
Epeak [keV] : 85.4912 ( -17.2735 107.912 )
Norm@50keV : 1.42466E-02 ( -0.00234426 0.00293639 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.16 using 59 PHA bins.
# Reduced chi-squared = 0.8422 for 56 degrees of freedom
# Null hypothesis probability = 7.937292e-01
Photon flux (15-150 keV) in 47.45 sec: 1.55691 ( -0.04781 0.04812 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.82291e-06 ( -1.27228e-07 1.26929e-07 ) ergs/cm2
Band function
Time interval is from -0.044 sec. to 47.408 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.64577 ( -0.683781 1.30709 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 85.4750 ( -14.6914 107.747 )
Norm@50keV : 1.42439E-02 ( -0.00234492 0.00293669 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.16 using 59 PHA bins.
# Reduced chi-squared = 0.8575 for 55 degrees of freedom
# Null hypothesis probability = 7.646845e-01
Photon flux (15-150 keV) in 47.45 sec: 1.56200 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.84033e-06 ( -4.83999e-06 -1.25334e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.0212 ( )
R^2/D10^2 : 0.193067 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 515.64 using 59 PHA bins.
# Reduced chi-squared = 9.0464 for 57 degrees of freedom
# Null hypothesis probability = 4.274106e-75
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.804e-07 1.725e-08
25- 50 1.417e-06 3.891e-08
50-150 1.836e-06 7.521e-08
15-150 3.633e-06 8.612e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 103.847 (-7.4982 12.1689)
Norm : 6.71775 (-0.273189 0.218676)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.48 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 57 degrees of freedom
# Null hypothesis probability = 4.571856e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.331e-07 4.626e-08
25- 50 1.451e-06 4.935e-08
50-150 2.402e-06 5.170e-07
15-150 4.686e-06 5.514e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.25170 (-0.456502 0.485741)
R1^2/D10^2 : 2.78428 (-0.708791 1.01379)
kT2 [keV] : 22.3286 (-1.35586 1.59797)
R2^2/D10^2 : 2.72812E-02 (-0.00651809 0.00776123)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.56 using 59 PHA bins.
# Reduced chi-squared = 0.8466 for 55 degrees of freedom
# Null hypothesis probability = 7.839096e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.448e-07 6.762e-08
25- 50 1.424e-06 5.480e-08
50-150 2.443e-06 1.210e-07
15-150 4.711e-06 1.727e-07
Peak spectrum fit
Power-law model
Time interval is from 10.256 sec. to 11.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61987 ( -0.0745779 0.0750725 )
Norm@50keV : 4.29716E-02 ( -0.00182987 0.0018246 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.47 using 59 PHA bins.
# Reduced chi-squared = 0.8680 for 57 degrees of freedom
# Null hypothesis probability = 7.502803e-01
Photon flux (15-150 keV) in 1 sec: 5.55658 ( -0.236766 0.237116 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.0094e-07 ( -1.82308e-08 1.83072e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.256 sec. to 11.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27839 ( -0.3072 0.28672 )
Epeak [keV] : 104.526 ( -28.3031 237.23 )
Norm@50keV : 6.40011E-02 ( -0.017765 0.0268608 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.27 using 59 PHA bins.
# Reduced chi-squared = 0.8084 for 56 degrees of freedom
# Null hypothesis probability = 8.467739e-01
Photon flux (15-150 keV) in 1 sec: 5.45096 ( -0.25166 0.25183 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.89914e-07 ( -2.0622e-08 2.0554e-08 ) ergs/cm2
Band function
Time interval is from 10.256 sec. to 11.256 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.900025 ( -1.23418 0.0721754 )
beta : -1.74173 ( -0.144623 0.113776 )
Epeak [keV] : 33.8679 ( -14.1118 34.4438 )
Norm@50keV : 2.21616 ( -2.22692 1251.73 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.30 using 59 PHA bins.
# Reduced chi-squared = 0.7509 for 55 degrees of freedom
# Null hypothesis probability = 9.145194e-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] : 13.8768 ( )
R^2/D10^2 : 0.790682 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 172.04 using 59 PHA bins.
# Reduced chi-squared = 3.0183 for 57 degrees of freedom
# Null hypothesis probability = 1.773074e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.219e-08 2.610e-09
25- 50 1.187e-07 5.500e-09
50-150 1.498e-07 1.215e-08
15-150 3.006e-07 1.415e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 166.392 (-32.0569 -166.384)
Norm : 22.6660 (-1.06568 1.1524)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.12 using 59 PHA bins.
# Reduced chi-squared = 0.7916 for 57 degrees of freedom
# Null hypothesis probability = 8.722151e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.765e-08 3.705e-09
25- 50 1.084e-07 9.130e-09
50-150 2.230e-07 6.495e-08
15-150 3.891e-07 7.290e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.14586 (-0.872047 0.950005)
R1^2/D10^2 : 5.70291 (-1.91821 3.20125)
kT2 [keV] : 25.9373 (-3.46146 5.0613)
R2^2/D10^2 : 6.46080E-02 (-0.0306624 0.0462072)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.16 using 59 PHA bins.
# Reduced chi-squared = 0.7483 for 55 degrees of freedom
# Null hypothesis probability = 9.170192e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.517e-08 6.720e-09
25- 50 1.108e-07 1.186e-08
50-150 2.242e-07 3.625e-08
15-150 3.902e-07 4.755e-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: 1.61422 ( -0.0469481 0.0470457 )
Norm@50keV : 2.06061E-02 ( -0.000497854 0.000497726 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.39 using 59 PHA bins.
# Reduced chi-squared = 0.9541 for 57 degrees of freedom
# Null hypothesis probability = 5.737334e-01
Photon flux (15-150 keV) in 11.66 sec: 2.65978 ( -0.0717812 0.0720394 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24322e-06 ( -5.66851e-08 5.67671e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35541 ( -0.192741 0.184697 )
Epeak [keV] : 133.678 ( -35.1273 180.13 )
Norm@50keV : 2.71780E-02 ( -0.00475196 0.00604814 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.58 using 59 PHA bins.
# Reduced chi-squared = 0.8674 for 56 degrees of freedom
# Null hypothesis probability = 7.490322e-01
Photon flux (15-150 keV) in 11.66 sec: 2.60300 ( -0.08111 0.0815 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20003e-06 ( -6.50162e-08 6.46897e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.697505 ( -0.465555 5.88543 )
beta : -1.69009 ( 1.696 0.0810152 )
Epeak [keV] : 51.0912 ( -27.1823 163.865 )
Norm@50keV : 7.28857E-02 ( -0.0436884 1105.46 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.00 using 59 PHA bins.
# Reduced chi-squared = 0.8728 for 55 degrees of freedom
# Null hypothesis probability = 7.368219e-01
Photon flux (15-150 keV) in 11.66 sec: 2.57868 ( 4.42132 -0.04527 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20034e-06 ( -2.20025e-06 -6.31622e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.42e-06
S(50-100 keV) = 1.56e-06
T90 vs. Hardness ratio plot
T90 = 38.8199999332428 sec.
Hardness ratio (energy fluence ratio) = 1.09859
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.08187
Count Ratio (50-100 keV) / (15-25 keV) = 0.65164
Mask shadow pattern
IMX = 2.927979197598233E-01, IMY = 1.420848382767138E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-239.888000 -0.044000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5211 -40.5697 0.5 32.2 -134.5 6.2648 24.1 1.0 Vela X-1
170.3632 -60.6399 3.8 23.5 162.6 0.6811 3.1 1.7 Cen X-3
186.6809 -62.7576 3.3 25.9 144.2 0.8914 3.5 1.0 GX 301-2
169.1448 -21.5940 2.3 17.4 -51.8 1.0285 5.0 ------ UNKNOWN
110.4408 -50.7319 2.3 48.0 -154.3 2.3589 5.1 ------ UNKNOWN
92.2575 -51.4209 3.4 58.7 -159.2 5.4131 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.044000 11.612600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.3776 -40.5460 7.1 32.3 -134.5 -0.1116 -1.6 6.9 Vela X-1
170.6896 -60.5919 7.0 23.4 162.2 0.1008 1.6 11.2 Cen X-3
186.9211 -62.8465 6.5 26.0 144.1 -0.1273 -1.8 8.6 GX 301-2
207.7414 -29.2260 2.5 26.7 55.1 0.3418 4.7 ------ UNKNOWN
200.7993 -8.8891 2.1 35.7 16.8 0.4241 5.4 ------ UNKNOWN
201.1185 7.4426 2.9 50.2 5.7 0.6128 4.0 ------ UNKNOWN
177.2069 -19.4818 0.2 18.0 -25.9 3.9258 74.4 ------ UNKNOWN
123.3588 -29.1971 2.8 45.1 -121.8 1.0397 4.1 ------ UNKNOWN
121.5960 -30.3791 2.1 46.0 -124.2 1.4389 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
51.612600 962.187700
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5098 -40.5384 0.7 41.3 -150.8 18.0193 16.8 1.3 Vela X-1
170.1088 -60.5676 5.2 41.4 164.4 2.8116 2.2 6.9 Cen X-3
186.5878 -62.7141 3.5 43.7 152.9 5.2523 3.3 3.9 GX 301-2
137.1359 -67.2613 4.3 54.1 177.0 6.7675 2.7 ------ UNKNOWN
194.3647 26.8872 2.9 49.3 -0.5 5.6775 4.0 ------ UNKNOWN
175.2672 23.6544 3.4 43.2 -23.5 3.3323 3.4 ------ UNKNOWN
150.4422 -7.9279 3.5 28.4 -90.6 3.1882 3.3 ------ UNKNOWN
113.1515 -50.7988 3.4 58.7 -159.2 17.7953 3.4 ------ UNKNOWN
Plot creation:
Sun May 31 01:17:18 EDT 2015