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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
8.3922 61.1334 0.0091 36.5268 145.7169 3.9627253 21.161 TRIG_00293924
Foreground time interval of the image:
-9.472 77.652 (delta_t = 87.124 [sec])
Background time interval of the image:
-239.128 -9.472 (delta_t = 229.656 [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 -9.472 sec. to 77.652 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44391 ( -0.125419 0.12546 )
Norm@50keV : 2.82624E-03 ( -0.000190713 0.000190295 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.34 using 59 PHA bins.
# Reduced chi-squared = 1.585 for 57 degrees of freedom
# Null hypothesis probability = 3.238053e-03
Photon flux (15-150 keV) in 87.12 sec: 0.347772 ( -0.0244656 0.0245796 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35883e-06 ( -1.7401e-07 1.74825e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.472 sec. to 77.652 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44161 ( -0.221781 0.12556 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.83540E-03 ( -0.000191069 0.000896436 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.36 using 59 PHA bins.
# Reduced chi-squared = 1.614 for 56 degrees of freedom
# Null hypothesis probability = 2.466684e-03
Photon flux (15-150 keV) in 87.12 sec: 0.348382 ( -0.025166 0.023924 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35003e-06 ( -1.66007e-07 1.79729e-07 ) ergs/cm2
Band function
Time interval is from -9.472 sec. to 77.652 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14862 ( 1.1496 6.14526 )
beta : -1.44388 ( -0.127393 0.125426 )
Epeak [keV] : 36.7667 ( -36.1209 -36.1209 )
Norm@50keV : 5.68411E-03 ( -0.00226641 0.404298 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.34 using 59 PHA bins.
# Reduced chi-squared = 1.643 for 55 degrees of freedom
# Null hypothesis probability = 1.881036e-03
Photon flux (15-150 keV) in 87.12 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] : 17.1499 ( )
R^2/D10^2 : 2.41118E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 165.51 using 59 PHA bins.
# Reduced chi-squared = 2.9037 for 57 degrees of freedom
# Null hypothesis probability = 1.628886e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.255e-07 1.925e-08
25- 50 5.593e-07 5.445e-08
50-150 1.178e-06 1.494e-07
15-150 1.862e-06 1.642e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.43121 (-0.096207 0.0961985)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 96.64 using 59 PHA bins.
# Reduced chi-squared = 1.695 for 57 degrees of freedom
# Null hypothesis probability = 8.177174e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.105e-07 2.509e-08
25- 50 5.973e-07 4.883e-08
50-150 1.310e-06 2.912e-07
15-150 2.218e-06 4.831e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.41073 (-1.30347 1.51242)
R1^2/D10^2 : 0.518973 (-0.276983 0.740118)
kT2 [keV] : 30.3453 (-5.44006 9.0328)
R2^2/D10^2 : 3.04147E-03 (-0.00170072 0.00288497)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.68 using 59 PHA bins.
# Reduced chi-squared = 1.649 for 55 degrees of freedom
# Null hypothesis probability = 1.747153e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.078e-07 8.307e-08
25- 50 5.447e-07 1.142e-07
50-150 1.558e-06 4.003e-07
15-150 2.411e-06 5.022e-07
Peak spectrum fit
Power-law model
Time interval is from 45.976 sec. to 46.976 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28836 ( -0.249623 0.249578 )
Norm@50keV : 1.48747E-02 ( -0.00202468 0.00202034 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.27 using 59 PHA bins.
# Reduced chi-squared = 0.7941 for 57 degrees of freedom
# Null hypothesis probability = 8.689326e-01
Photon flux (15-150 keV) in 1 sec: 1.77083 ( -0.247314 0.248359 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47413e-07 ( -2.24251e-08 2.26064e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 45.976 sec. to 46.976 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.45607 ( -0.813899 0.248677 )
Epeak [keV] : 374.588 ( -9999.36 -9999.36 )
Norm@50keV : 1.12215E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.15 using 59 PHA bins.
# Reduced chi-squared = 0.8062 for 56 degrees of freedom
# Null hypothesis probability = 8.499681e-01
Photon flux (15-150 keV) in 1 sec: 1.77035 ( -0.24749 0.24764 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47448e-07 ( -2.2499e-08 2.2502e-08 ) ergs/cm2
Band function
Time interval is from 45.976 sec. to 46.976 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.08146 ( 1.08167 6.0648 )
beta : -1.28828 ( -0.248976 0.249833 )
Epeak [keV] : 51.1501 ( -51.0381 -51.0381 )
Norm@50keV : 2.47827E-02 ( -0.0106171 2.27149 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.27 using 59 PHA bins.
# Reduced chi-squared = 0.8230 for 55 degrees of freedom
# Null hypothesis probability = 8.224382e-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] : 20.9931 (-3.63343 4.53571)
R^2/D10^2 : 6.75100E-02 (-0.0315349 0.057933)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.28 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 57 degrees of freedom
# Null hypothesis probability = 3.579606e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.622e-09 1.602e-09
25- 50 2.889e-08 7.610e-09
50-150 9.490e-08 2.469e-08
15-150 1.294e-07 2.891e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 7.31407 (-1.00659 1.00649)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.53 using 59 PHA bins.
# Reduced chi-squared = 0.8690 for 57 degrees of freedom
# Null hypothesis probability = 7.483433e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.822e-08 1.046e-08
25- 50 3.505e-08 1.936e-08
50-150 7.687e-08 4.277e-08
15-150 1.301e-07 7.250e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.23748 (-1.47601 2.1215)
R1^2/D10^2 : 12.6346 (-10.4766 74.7706)
kT2 [keV] : 26.7497 (-5.2693 8.2751)
R2^2/D10^2 : 2.84378E-02 (-0.0162269 0.0296929)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.53 using 59 PHA bins.
# Reduced chi-squared = 0.7368 for 55 degrees of freedom
# Null hypothesis probability = 9.276882e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.850e-08 1.026e-08
25- 50 2.638e-08 8.945e-09
50-150 1.048e-07 3.942e-08
15-150 1.496e-07 4.943e-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: 1.44391 ( -0.125419 0.12546 )
Norm@50keV : 2.82624E-03 ( -0.000190713 0.000190295 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.34 using 59 PHA bins.
# Reduced chi-squared = 1.585 for 57 degrees of freedom
# Null hypothesis probability = 3.238053e-03
Photon flux (15-150 keV) in 87.12 sec: 0.347772 ( -0.0244656 0.0245796 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35883e-06 ( -1.7401e-07 1.74825e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44161 ( -0.221781 0.12556 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.83540E-03 ( -0.000191069 0.000896436 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.36 using 59 PHA bins.
# Reduced chi-squared = 1.614 for 56 degrees of freedom
# Null hypothesis probability = 2.466684e-03
Photon flux (15-150 keV) in 87.12 sec: 0.348382 ( -0.025166 0.023924 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35003e-06 ( -1.66007e-07 1.79729e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14862 ( 1.1496 6.14526 )
beta : -1.44388 ( -0.127393 0.125426 )
Epeak [keV] : 36.7667 ( -36.1209 -36.1209 )
Norm@50keV : 5.68411E-03 ( -0.00226641 0.404298 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.34 using 59 PHA bins.
# Reduced chi-squared = 1.643 for 55 degrees of freedom
# Null hypothesis probability = 1.881036e-03
Photon flux (15-150 keV) in 87.12 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) = 5.67e-07
S(50-100 keV) = 8.34e-07
T90 vs. Hardness ratio plot
T90 = 65.8799999952316 sec.
Hardness ratio (energy fluence ratio) = 1.4709
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.22056
Count Ratio (50-100 keV) / (15-25 keV) = 1.13399
Mask shadow pattern
IMX = -6.120018621672628E-01, IMY = -4.172149212453142E-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:
-239.128000 -9.472000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6307 22.0118 0.3 37.1 22.2 9.3070 33.4 0.2 Crab
25.3066 48.3131 2.9 36.2 118.5 1.4957 4.0 ------ UNKNOWN
344.4094 53.5971 3.0 51.1 149.9 3.6281 3.9 ------ UNKNOWN
88.9460 8.4175 2.3 50.7 14.7 2.7341 4.9 ------ UNKNOWN
335.5182 66.9809 2.4 44.1 166.4 1.5453 4.7 ------ UNKNOWN
137.4544 33.3987 3.9 42.2 -57.5 1.8325 2.9 ------ UNKNOWN
136.2027 25.3954 4.0 48.2 -49.9 2.8591 2.9 ------ UNKNOWN
155.5993 47.6601 2.9 40.9 -87.4 3.6849 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-9.472000 77.652000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.5124 21.9621 245.2 37.2 22.4 -0.0074 -0.0 7.4 Crab
72.7798 20.4974 2.1 39.8 38.1 1.2485 5.5 ------ UNKNOWN
8.3922 61.1334 0.5 36.5 145.7 3.9626 21.1 ------ UNKNOWN
245.7847 71.5138 2.6 48.6 -153.3 1.0132 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
415.172600 962.932000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5747 35.4031 14.3 48.3 -162.8 -0.5094 -0.8 6.8 Her X-1
274.8369 34.6717 3.8 56.9 179.3 5.4308 3.1 ------ UNKNOWN
219.0219 58.6863 2.5 15.7 -153.1 1.2339 4.6 ------ UNKNOWN
152.1214 24.8590 2.5 47.6 -31.4 2.7254 4.6 ------ UNKNOWN
249.5722 26.8507 4.0 53.9 -152.9 2.9602 2.9 ------ UNKNOWN
243.9114 23.1040 4.2 55.2 -145.3 5.8461 2.8 ------ UNKNOWN
Plot creation:
Sun May 31 09:01:07 EDT 2015