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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
39.2437 -33.1331 0.0124 22.7315 80.1288 1.0887588 15.357 TRIG_00629547
Foreground time interval of the image:
-1.600 26.688 (delta_t = 28.288 [sec])
Background time interval of the image:
-239.488 -1.600 (delta_t = 237.888 [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 2.048000
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 2.048000
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 2.048000
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 -1.600 sec. to 26.688 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46596 ( -0.192164 0.193657 )
Norm@50keV : 2.31171E-03 ( -0.000243852 0.000241735 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.44 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.869044e-01
Photon flux (15-150 keV) in 28.29 sec: 0.286032 ( -0.0295567 0.0296181 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.2401e-07 ( -7.35118e-08 7.43555e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.600 sec. to 26.688 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12072 ( )
Epeak [keV] : 45.8191 ( )
Norm@50keV : 1.04529E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.42 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 56 degrees of freedom
# Null hypothesis probability = 3.521675e-01
Photon flux (15-150 keV) in 28.29 sec: 0.286540 ( -0.044978 0.02913 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.24646e-07 ( -7.37973e-08 7.13898e-08 ) ergs/cm2
Band function
Time interval is from -1.600 sec. to 26.688 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13277 ( 1.12543 1.12543 )
beta : -1.46636 ( -0.20272 0.194056 )
Epeak [keV] : 45.1608 ( -48.406 -48.406 )
Norm@50keV : 4.59289E-03 ( -0.00249922 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.43 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 55 degrees of freedom
# Null hypothesis probability = 3.173300e-01
Photon flux (15-150 keV) in 28.29 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] : 16.4356 (-2.47911 2.98301)
R^2/D10^2 : 2.27813E-02 (-0.00976977 0.0171656)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.63 using 59 PHA bins.
# Reduced chi-squared = 1.713 for 57 degrees of freedom
# Null hypothesis probability = 6.525971e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.577e-08 7.344e-09
25- 50 1.540e-07 2.579e-08
50-150 2.936e-07 5.754e-08
15-150 4.833e-07 7.327e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.16634 (-0.118777 0.118771)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.39 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 57 degrees of freedom
# Null hypothesis probability = 2.906644e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.217e-08 4.518e-08
25- 50 1.581e-07 8.705e-08
50-150 3.467e-07 1.871e-07
15-150 5.869e-07 3.158e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.08991 (-1.14673 1.57594)
R1^2/D10^2 : 1.08289 (-0.708136 2.21154)
kT2 [keV] : 27.1237 (-5.65936 10.1479)
R2^2/D10^2 : 3.74410E-03 (-0.00234743 0.00439186)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.21 using 59 PHA bins.
# Reduced chi-squared = 1.040 for 55 degrees of freedom
# Null hypothesis probability = 3.932028e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.291e-08 4.638e-08
25- 50 1.310e-07 4.014e-08
50-150 4.125e-07 1.431e-07
15-150 6.364e-07 1.938e-07
Peak spectrum fit
Power-law model
Time interval is from 17.324 sec. to 18.324 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12669 ( -0.303057 0.293238 )
Norm@50keV : 8.49883E-03 ( -0.00132454 0.00132269 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.30 using 59 PHA bins.
# Reduced chi-squared = 0.6368 for 57 degrees of freedom
# Null hypothesis probability = 9.852219e-01
Photon flux (15-150 keV) in 1 sec: 0.988511 ( -0.159229 0.15974 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.81151e-08 ( -1.52485e-08 1.54077e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.324 sec. to 18.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12898 ( -0.312103 0.288514 )
Epeak [keV] : 9999.35 ( -9999.36 -9999.36 )
Norm@50keV : 8.54453E-03 ( -0.00132618 0.0102829 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.31 using 59 PHA bins.
# Reduced chi-squared = 0.6484 for 56 degrees of freedom
# Null hypothesis probability = 9.809136e-01
Photon flux (15-150 keV) in 1 sec: 0.990381 ( -0.160003 0.157599 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.74888e-08 ( -1.46594e-08 1.58542e-08 ) ergs/cm2
Band function
Time interval is from 17.324 sec. to 18.324 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.919923 ( 0.919923 0.919923 )
beta : -1.12668 ( 1.12668 0.303054 )
Epeak [keV] : 51.7615 ( -51.7615 -51.7615 )
Norm@50keV : 1.46047E-02 ( -0.00657649 463273 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.30 using 59 PHA bins.
# Reduced chi-squared = 0.6600 for 55 degrees of freedom
# Null hypothesis probability = 9.757151e-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] : 21.8361 (-4.62175 6.58514)
R^2/D10^2 : 3.40679E-02 (-0.0189569 0.0389855)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.55 using 59 PHA bins.
# Reduced chi-squared = 0.8342 for 57 degrees of freedom
# Null hypothesis probability = 8.094660e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.017e-09 1.224e-09
25- 50 1.588e-08 4.419e-09
50-150 5.656e-08 1.902e-08
15-150 7.546e-08 2.001e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 4.07460 (-0.652467 0.652401)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.95 using 59 PHA bins.
# Reduced chi-squared = 0.7535 for 57 degrees of freedom
# Null hypothesis probability = 9.160385e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.015e-08 5.800e-09
25- 50 1.952e-08 1.097e-08
50-150 4.280e-08 2.399e-08
15-150 7.247e-08 4.087e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.72662 (-1.9225 4.24437)
R1^2/D10^2 : 3.91646 (-3.55505 46.5035)
kT2 [keV] : 29.6463 (-7.86237 20.0467)
R2^2/D10^2 : 1.22171E-02 (-0.0094797 0.0182388)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.59 using 59 PHA bins.
# Reduced chi-squared = 0.6472 for 55 degrees of freedom
# Null hypothesis probability = 9.803961e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.257e-09 5.065e-09
25- 50 1.468e-08 6.516e-09
50-150 6.491e-08 3.249e-08
15-150 8.884e-08 4.412e-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: 1.46596 ( -0.192164 0.193657 )
Norm@50keV : 2.31171E-03 ( -0.000243852 0.000241735 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.44 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.869044e-01
Photon flux (15-150 keV) in 28.29 sec: 0.286032 ( -0.0295567 0.0296181 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.2401e-07 ( -7.35118e-08 7.43555e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12072 ( )
Epeak [keV] : 45.8191 ( )
Norm@50keV : 1.04529E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.42 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 56 degrees of freedom
# Null hypothesis probability = 3.521675e-01
Photon flux (15-150 keV) in 28.29 sec: 0.286540 ( -0.044978 0.02913 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.24646e-07 ( -7.37973e-08 7.13898e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13277 ( 1.12543 1.12543 )
beta : -1.46636 ( -0.20272 0.194056 )
Epeak [keV] : 45.1608 ( -48.406 -48.406 )
Norm@50keV : 4.59289E-03 ( -0.00249922 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.43 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 55 degrees of freedom
# Null hypothesis probability = 3.173300e-01
Photon flux (15-150 keV) in 28.29 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) = 1.52e-07
S(50-100 keV) = 2.20e-07
T90 vs. Hardness ratio plot
T90 = 25.472000002861 sec.
Hardness ratio (energy fluence ratio) = 1.44737
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.953159
Count Ratio (50-100 keV) / (15-25 keV) = 0.917931
Mask shadow pattern
IMX = 7.182336479167151E-02, IMY = -4.127527821486207E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-239.488000 -1.600000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
26.9186 16.4695 3.0 55.9 10.6 3.8602 3.9 ------ UNKNOWN
28.5016 -27.3399 2.5 17.4 51.9 0.8142 4.6 ------ UNKNOWN
344.1786 -84.3851 3.0 47.5 176.6 1.4708 3.8 ------ UNKNOWN
308.4789 -77.6262 2.4 47.8 -172.0 1.5870 4.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.600000 26.688000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
81.0199 -65.1211 2.4 47.8 141.0 1.0930 4.8 ------ UNKNOWN
39.2437 -33.1331 0.7 22.7 80.1 1.0889 15.4 ------ UNKNOWN
348.4809 -57.4130 2.6 25.1 -156.7 0.2391 4.5 ------ UNKNOWN
327.8250 -22.0697 2.2 40.7 -87.3 1.0825 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
72.412610 962.570600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
91.5591 -67.9235 2.8 45.7 166.1 4.8800 4.1 ------ UNKNOWN
124.5196 -75.9087 4.7 56.8 173.8 7.4694 2.5 ------ UNKNOWN
23.4294 -8.2688 2.8 28.8 -23.2 2.1959 4.0 ------ UNKNOWN
340.9737 -51.5341 3.3 45.4 -121.3 8.8256 3.5 ------ UNKNOWN
Plot creation:
Thu May 28 13:36:26 EDT 2015