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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
147.2315 -13.1859 0.0054 8.9874 166.1694 1.1958102 35.830 TRIG_00239899
Foreground time interval of the image:
-0.732 10.909 (delta_t = 11.641 [sec])
Background time interval of the image:
-239.592 -0.732 (delta_t = 238.860 [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 0.256000
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 0.256000
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 0.256000
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 -0.732 sec. to 121.416 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40266 ( -0.0275955 0.0274472 )
Norm@50keV : 1.17829E-02 ( -0.000172081 0.000171712 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 27.42 using 59 PHA bins.
# Reduced chi-squared = 0.4810 for 57 degrees of freedom
# Null hypothesis probability = 9.996839e-01
Photon flux (15-150 keV) in 122.1 sec: 1.43580 ( -0.0251936 0.0252986 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3894e-05 ( -1.93017e-07 1.93029e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.732 sec. to 121.416 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39895 ( -0.029175 0.0362794 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 1.18242E-02 ( -0.000171994 0.000163811 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 27.50 using 59 PHA bins.
# Reduced chi-squared = 0.4910 for 56 degrees of freedom
# Null hypothesis probability = 9.995159e-01
Photon flux (15-150 keV) in 122.1 sec: 1.43609 ( -0.02557 0.02366 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3896e-05 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.732 sec. to 121.416 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.676540 ( 0.971995 4.92393 )
beta : -1.40460 ( 1.40432 0.0283876 )
Epeak [keV] : 42.8682 ( -58.7329 349.701 )
Norm@50keV : 4.22081E-02 ( -0.0302611 723369 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 27.24 using 59 PHA bins.
# Reduced chi-squared = 0.4952 for 55 degrees of freedom
# Null hypothesis probability = 9.993878e-01
Photon flux (15-150 keV) in 122.1 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] : 20.4858 ( )
R^2/D10^2 : 5.43564E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1110.23 using 59 PHA bins.
# Reduced chi-squared = 19.4777 for 57 degrees of freedom
# Null hypothesis probability = 4.477540e-195
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.317e-07 1.673e-08
25- 50 2.691e-06 6.288e-08
50-150 8.396e-06 1.685e-07
15-150 1.162e-05 1.636e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 6.14644 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 228.50 using 59 PHA bins.
# Reduced chi-squared = 4.0087 for 57 degrees of freedom
# Null hypothesis probability = 2.152461e-22
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.869e-06 3.236e-08
25- 50 3.595e-06 6.105e-08
50-150 7.884e-06 1.258e-07
15-150 1.335e-05 2.198e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.26343 (-0.474112 0.498442)
R1^2/D10^2 : 0.787977 (-0.143538 0.183654)
kT2 [keV] : 33.3622 (-1.80054 2.13316)
R2^2/D10^2 : 8.74274E-03 (-0.00164941 0.00184182)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.43 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.213554e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.389e-06 7.570e-08
25- 50 3.366e-06 8.181e-08
50-150 9.015e-06 2.332e-07
15-150 1.377e-05 3.053e-07
Peak spectrum fit
Power-law model
Time interval is from 74.480 sec. to 75.480 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05095 ( -0.0365839 0.0364354 )
Norm@50keV : 0.184644 ( -0.0035975 0.00359109 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 26.34 using 59 PHA bins.
# Reduced chi-squared = 0.4621 for 57 degrees of freedom
# Null hypothesis probability = 9.998329e-01
Photon flux (15-150 keV) in 1 sec: 21.3273 ( -0.432278 0.4331 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.96178e-06 ( -4.00089e-08 4.00809e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 74.480 sec. to 75.480 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04583 ( -0.0372635 0.0362659 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 0.185686 ( -0.00355533 0.0247812 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 26.35 using 59 PHA bins.
# Reduced chi-squared = 0.4705 for 56 degrees of freedom
# Null hypothesis probability = 9.997482e-01
Photon flux (15-150 keV) in 1 sec: 21.3189 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.96222e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 74.480 sec. to 75.480 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.834664 ( 0.834664 0.834664 )
beta : -1.05095 ( -0.0364331 0.0365269 )
Epeak [keV] : 61.4903 ( -61.4903 -61.4903 )
Norm@50keV : 0.315525 ( -0.109353 7.61396e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 26.34 using 59 PHA bins.
# Reduced chi-squared = 0.4789 for 55 degrees of freedom
# Null hypothesis probability = 9.996289e-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] : 22.9608 ( )
R^2/D10^2 : 0.648620 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 502.39 using 59 PHA bins.
# Reduced chi-squared = 8.8139 for 57 degrees of freedom
# Null hypothesis probability = 1.581765e-72
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.202e-08 2.510e-09
25- 50 3.362e-07 9.500e-09
50-150 1.324e-06 3.900e-08
15-150 1.722e-06 3.950e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 90.0920 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 592.28 using 59 PHA bins.
# Reduced chi-squared = 10.391 for 57 degrees of freedom
# Null hypothesis probability = 4.342298e-90
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.243e-07 4.600e-09
25- 50 4.315e-07 9.100e-09
50-150 9.464e-07 1.940e-08
15-150 1.602e-06 3.200e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.11415 (-0.783055 0.867755)
R1^2/D10^2 : 9.67095 (-2.66763 3.95562)
kT2 [keV] : 35.7301 (-2.59388 3.35015)
R2^2/D10^2 : 0.143969 (-0.0351321 0.0390928)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.17 using 59 PHA bins.
# Reduced chi-squared = 0.7485 for 55 degrees of freedom
# Null hypothesis probability = 9.168523e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.420e-07 1.080e-08
25- 50 3.776e-07 1.635e-08
50-150 1.452e-06 5.700e-08
15-150 1.971e-06 6.650e-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: 1.59093 ( -0.0871169 0.0877058 )
Norm@50keV : 6.14934E-03 ( -0.000302128 0.000301052 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.02 using 59 PHA bins.
# Reduced chi-squared = 0.7020 for 57 degrees of freedom
# Null hypothesis probability = 9.572171e-01
Photon flux (15-150 keV) in 11.64 sec: 0.788016 ( -0.0384111 0.038468 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.70159e-07 ( -3.55306e-08 3.57343e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30307 ( -0.358896 0.319565 )
Epeak [keV] : 119.797 ( -41.335 -119.797 )
Norm@50keV : 8.59850E-03 ( -0.00257021 0.00432843 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.83 using 59 PHA bins.
# Reduced chi-squared = 0.6755 for 56 degrees of freedom
# Null hypothesis probability = 9.702018e-01
Photon flux (15-150 keV) in 11.64 sec: 0.774832 ( -0.041195 0.041177 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.53711e-07 ( -4.05165e-08 4.04676e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.28510 ( 1.2851 1.2851 )
beta : -1.91395 ( 1.9151 0.36879 )
Epeak [keV] : 113.823 ( -113.775 -113.775 )
Norm@50keV : 8.80664E-03 ( -0.002783 0.21936 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.83 using 59 PHA bins.
# Reduced chi-squared = 0.6878 for 55 degrees of freedom
# Null hypothesis probability = 9.626219e-01
Photon flux (15-150 keV) in 11.64 sec: 0.774562 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.52808e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 3.27e-06
S(50-100 keV) = 4.95e-06
T90 vs. Hardness ratio plot
T90 = 81.2159999907017 sec.
Hardness ratio (energy fluence ratio) = 1.51376
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.35473
Count Ratio (50-100 keV) / (15-25 keV) = 1.10786
Mask shadow pattern
IMX = -1.535740924399797E-01, IMY = -3.780838379738825E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
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:
-239.592000 -0.732000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5821 -40.5667 0.9 20.3 -5.6 1.8977 12.7 2.5 Vela X-1
170.4184 -60.6006 8.1 42.5 -45.0 0.4820 1.4 3.3 Cen X-3
136.5480 16.4498 2.1 39.3 140.0 1.8275 5.5 ------ UNKNOWN
130.2930 -6.1025 2.4 21.4 108.7 0.8640 4.9 ------ UNKNOWN
146.0765 -6.9176 3.0 15.1 156.6 0.5584 3.9 ------ UNKNOWN
174.1736 19.7780 2.6 50.5 -170.6 1.5578 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.732000 10.908610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6690 -40.4445 5.1 20.2 -5.6 0.0764 2.3 9.2 Vela X-1
170.3946 -60.7551 6.4 42.6 -44.9 0.1280 1.8 8.3 Cen X-3
98.8794 -48.9855 2.4 45.3 14.8 0.3539 4.9 ------ UNKNOWN
90.7964 -58.6540 2.4 53.1 5.0 0.5787 4.8 ------ UNKNOWN
147.2315 -13.1859 0.3 9.0 166.2 1.1958 35.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
41.908580 962.499500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5214 -40.5480 0.7 29.2 -0.9 9.1819 17.1 0.5 Vela X-1
170.1608 -60.7680 9.4 50.4 -33.7 2.1019 1.2 9.8 Cen X-3
128.9277 29.6215 2.8 46.3 138.4 6.8748 4.2 ------ UNKNOWN
155.0110 24.3674 3.1 38.3 172.0 2.4643 3.7 ------ UNKNOWN
150.2676 4.7779 3.0 18.2 170.3 1.6039 3.9 ------ UNKNOWN
147.2226 -13.1932 0.2 0.0 71.6 23.3642 52.3 ------ UNKNOWN
174.2161 31.2144 2.6 51.4 -169.6 5.8811 4.4 ------ UNKNOWN
162.1672 -36.6769 3.1 27.0 -46.4 2.1198 3.7 ------ UNKNOWN
174.4315 -15.6045 4.1 26.4 -100.8 1.6903 2.8 ------ UNKNOWN
Plot creation:
Sun May 31 11:23:01 EDT 2015