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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
48.2853 -65.9900 0.0087 25.1184 2.6194 1.1231964 22.181 TRIG_00436094
Foreground time interval of the image:
-0.380 18.701 (delta_t = 19.081 [sec])
Background time interval of the image:
-239.600 -0.380 (delta_t = 239.220 [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)
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 -0.380 sec. to 87.072 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23418 ( -0.143858 0.142007 )
Norm@50keV : 1.56571E-03 ( -0.000116875 0.000116875 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.87 using 59 PHA bins.
# Reduced chi-squared = 0.9100 for 57 degrees of freedom
# Null hypothesis probability = 6.673021e-01
Photon flux (15-150 keV) in 87.45 sec: 0.184715 ( -0.0143461 0.0144015 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3761e-06 ( -1.15203e-07 1.15931e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.380 sec. to 87.072 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22645 ( -0.143756 0.14642 )
Epeak [keV] : 9999.35 ( -9999.36 -9999.36 )
Norm@50keV : 1.57274E-03 ( -0.000414585 0.000414588 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.92 using 59 PHA bins.
# Reduced chi-squared = 0.9272 for 56 degrees of freedom
# Null hypothesis probability = 6.299887e-01
Photon flux (15-150 keV) in 87.45 sec: 0.185083 ( -0.014858 0.014022 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37699e-06 ( -1.15058e-07 1.09155e-07 ) ergs/cm2
Band function
Time interval is from -0.380 sec. to 87.072 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.997033 ( 0.997033 0.997033 )
beta : -1.23416 ( 1.23416 0.143837 )
Epeak [keV] : 44.6691 ( -44.6691 -44.6691 )
Norm@50keV : 2.86958E-03 ( -0.00141998 0.225818 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.87 using 59 PHA bins.
# Reduced chi-squared = 0.9431 for 55 degrees of freedom
# Null hypothesis probability = 5.948829e-01
Photon flux (15-150 keV) in 87.45 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] : 19.4482 ( )
R^2/D10^2 : 8.78227E-03 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 115.35 using 59 PHA bins.
# Reduced chi-squared = 2.0238 for 57 degrees of freedom
# Null hypothesis probability = 7.758744e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.661e-08 9.952e-09
25- 50 2.767e-07 3.769e-08
50-150 7.725e-07 1.125e-07
15-150 1.106e-06 1.202e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 0.765610 (-0.0582279 0.0582209)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.38 using 59 PHA bins.
# Reduced chi-squared = 1.217 for 57 degrees of freedom
# Null hypothesis probability = 1.257728e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.667e-07 1.596e-08
25- 50 3.207e-07 6.073e-08
50-150 7.032e-07 2.626e-07
15-150 1.191e-06 2.272e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.90755 (-1.27522 1.45699)
R1^2/D10^2 : 0.129846 (-0.0569354 0.110296)
kT2 [keV] : 45.4075 (-11.5185 27.057)
R2^2/D10^2 : 5.75878E-04 (-0.000382909 0.000728591)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.94 using 59 PHA bins.
# Reduced chi-squared = 0.8170 for 55 degrees of freedom
# Null hypothesis probability = 8.316307e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.395e-07 3.487e-08
25- 50 3.045e-07 7.726e-08
50-150 1.009e-06 4.690e-07
15-150 1.453e-06 5.546e-07
Peak spectrum fit
Power-law model
Time interval is from -0.224 sec. to 0.776 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26971 ( -0.193715 0.192364 )
Norm@50keV : 1.12958E-02 ( -0.00132048 0.00131826 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.71 using 59 PHA bins.
# Reduced chi-squared = 0.9949 for 57 degrees of freedom
# Null hypothesis probability = 4.860121e-01
Photon flux (15-150 keV) in 1 sec: 1.34038 ( -0.157056 0.157193 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12471e-07 ( -1.47759e-08 1.49587e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.224 sec. to 0.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.501961 ( -1.06234 0.818017 )
Epeak [keV] : 95.2868 ( -31.8083 -95.3032 )
Norm@50keV : 2.81722E-02 ( -0.0171978 0.0712612 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.20 using 59 PHA bins.
# Reduced chi-squared = 0.9678 for 56 degrees of freedom
# Null hypothesis probability = 5.434173e-01
Photon flux (15-150 keV) in 1 sec: 1.30232 ( -0.16395 0.16306 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04935e-07 ( -1.75157e-08 1.7278e-08 ) ergs/cm2
Band function
Time interval is from -0.224 sec. to 0.776 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.64820 ( -4.49417 -3.88884 )
beta : -1.65917 ( -0.401084 0.351111 )
Epeak [keV] : 40.7833 ( -10.1717 68.2938 )
Norm@50keV : 3.14082 ( -3.13695 60.0434 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.92 using 59 PHA bins.
# Reduced chi-squared = 0.9259 for 55 degrees of freedom
# Null hypothesis probability = 6.310874e-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] : 15.3388 (-2.04449 2.52247)
R^2/D10^2 : 0.149242 (-0.060616 0.0946749)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.02 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 57 degrees of freedom
# Null hypothesis probability = 3.019308e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.323e-09 1.501e-09
25- 50 2.969e-08 5.875e-09
50-150 4.801e-08 1.080e-08
15-150 8.503e-08 1.321e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.50414 (-0.643608 0.643578)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.33 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 57 degrees of freedom
# Null hypothesis probability = 3.562611e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.371e-08 7.630e-09
25- 50 2.637e-08 1.455e-08
50-150 5.784e-08 3.191e-08
15-150 9.792e-08 5.345e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.7417 (-2.99223 2.97023)
R1^2/D10^2 : 0.376775 (-0.156207 0.346455)
kT2 [keV] : 47.2831 (-37.5199 -63.1534)
R2^2/D10^2 : 2.42317E-03 (-0.000919521 0.0164439)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.35 using 59 PHA bins.
# Reduced chi-squared = 0.9154 for 55 degrees of freedom
# Null hypothesis probability = 6.526707e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.654e-09 4.220e-09
25- 50 2.918e-08 1.320e-08
50-150 6.673e-08 3.665e-08
15-150 1.056e-07 5.053e-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: 1.14896 ( -0.135456 0.133404 )
Norm@50keV : 3.74396E-03 ( -0.000275613 0.000275341 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.97 using 59 PHA bins.
# Reduced chi-squared = 0.7889 for 57 degrees of freedom
# Null hypothesis probability = 8.757506e-01
Photon flux (15-150 keV) in 19.08 sec: 0.436570 ( -0.0333504 0.0334484 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.3561e-07 ( -5.94621e-08 5.97666e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14419 ( -0.465276 0.200764 )
Epeak [keV] : 9997.76 ( )
Norm@50keV : 3.76308E-03 ( -0.000275778 0.00272604 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.97 using 59 PHA bins.
# Reduced chi-squared = 0.8030 for 56 degrees of freedom
# Null hypothesis probability = 8.545222e-01
Photon flux (15-150 keV) in 19.08 sec: 0.436384 ( -0.03501 0.033406 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.37627e-07 ( -6.61313e-08 5.79116e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.766116 ( 0.77085 5.65865 )
beta : -1.18527 ( 1.18455 0.167116 )
Epeak [keV] : 115.932 ( -118.243 458.188 )
Norm@50keV : 6.37880E-03 ( -0.0028003 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.83 using 59 PHA bins.
# Reduced chi-squared = 0.8151 for 55 degrees of freedom
# Null hypothesis probability = 8.345711e-01
Photon flux (15-150 keV) in 19.08 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) = 2.95e-07
S(50-100 keV) = 5.01e-07
T90 vs. Hardness ratio plot
T90 = 70.891999900341 sec.
Hardness ratio (energy fluence ratio) = 1.69831
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.44699
Count Ratio (50-100 keV) / (15-25 keV) = 1.29189
Mask shadow pattern
IMX = 4.683360674006261E-01, IMY = -2.142568939790490E-02
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:
-239.600000 -0.380000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5201 -40.5156 1.1 37.5 -112.4 4.4896 10.6 2.4 Vela X-1
53.2018 -16.2062 3.0 40.4 102.2 2.8362 3.8 ------ UNKNOWN
80.0402 -19.9951 2.3 28.5 143.8 1.1517 4.9 ------ UNKNOWN
45.2319 -51.7653 2.5 24.2 37.3 0.9950 4.7 ------ UNKNOWN
328.3336 -68.0764 2.8 53.8 -5.6 2.2186 4.1 ------ UNKNOWN
183.7391 -73.3421 3.7 47.1 -53.1 3.0145 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.380000 18.700580
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5232 -40.5720 7.3 37.5 -112.3 -0.1578 -1.6 1.1 Vela X-1
93.8144 -7.0829 2.5 42.4 165.6 0.3825 4.7 ------ UNKNOWN
48.2853 -65.9900 0.5 25.1 2.6 1.1232 22.2 ------ UNKNOWN
115.7693 -4.8611 2.0 51.7 -167.0 0.6883 5.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
64.900620 962.483400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
311.9089 -56.6581 3.3 42.4 -3.6 2.7820 3.5 ------ UNKNOWN
19.3936 -73.3889 2.9 12.3 -17.1 1.9552 4.0 ------ UNKNOWN
293.6082 -51.8718 2.8 52.1 -12.4 5.2328 4.1 ------ UNKNOWN
133.8233 -45.1504 2.6 47.9 -129.0 10.2366 4.5 ------ UNKNOWN
Plot creation:
Sat May 30 23:42:28 EDT 2015