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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
84.3027 5.0770 0.0130 39.9299 -146.2523 1.1534768 14.650 TRIG_00308812
Foreground time interval of the image:
-13.100 10.412 (delta_t = 23.512 [sec])
Background time interval of the image:
-239.288 -13.100 (delta_t = 226.188 [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)
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 -13.100 sec. to 10.412 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03736 ( -0.179952 0.190457 )
Norm@50keV : 2.86912E-03 ( -0.00037006 0.000363061 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.12 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 57 degrees of freedom
# Null hypothesis probability = 3.634997e-01
Photon flux (15-150 keV) in 23.51 sec: 0.437930 ( -0.0451306 0.0451495 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.23471e-07 ( -7.44583e-08 7.57351e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -13.100 sec. to 10.412 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.691085 ( -1.11993 0.89967 )
Epeak [keV] : 40.3347 ( -9.08852 9.5967 )
Norm@50keV : 1.71537E-02 ( -0.0171537 0.0597595 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.01 using 59 PHA bins.
# Reduced chi-squared = 0.9466 for 56 degrees of freedom
# Null hypothesis probability = 5.886812e-01
Photon flux (15-150 keV) in 23.51 sec: 0.419399 ( -0.046426 0.046613 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.616e-07 ( -7.5848e-08 8.19512e-08 ) ergs/cm2
Band function
Time interval is from -13.100 sec. to 10.412 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.703559 ( -1.13744 1.94877 )
beta : -4.27933 ( 3.92185 1.6797 )
Epeak [keV] : 40.5201 ( -9.42302 9.34202 )
Norm@50keV : 1.67914E-02 ( -0.0167904 0.333663 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.99 using 59 PHA bins.
# Reduced chi-squared = 0.9634 for 55 degrees of freedom
# Null hypothesis probability = 5.518559e-01
Photon flux (15-150 keV) in 23.51 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] : 10.1464 (-1.06 1.18327)
R^2/D10^2 : 0.198081 (-0.0690354 0.105306)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.92 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 57 degrees of freedom
# Null hypothesis probability = 3.049767e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.811e-08 1.640e-08
25- 50 2.490e-07 3.090e-08
50-150 1.355e-07 3.702e-08
15-150 4.826e-07 6.183e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 61.1396 (-15.17 23.0096)
Norm : 2.29833 (-0.361581 0.415535)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.25 using 59 PHA bins.
# Reduced chi-squared = 0.9517 for 57 degrees of freedom
# Null hypothesis probability = 5.789590e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.362e-07 1.895e-08
25- 50 2.085e-07 2.285e-08
50-150 2.410e-07 6.438e-08
15-150 5.857e-07 8.946e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.26865 (-2.26289 4.2813)
R1^2/D10^2 : 2.52886 (-2.15621 138.61)
kT2 [keV] : 12.7941 (-2.45176 13.4208)
R2^2/D10^2 : 6.74380E-02 (-0.0641293 0.0854898)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.43 using 59 PHA bins.
# Reduced chi-squared = 0.9715 for 55 degrees of freedom
# Null hypothesis probability = 5.347808e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.285e-07 6.670e-08
25- 50 2.181e-07 9.182e-08
50-150 1.916e-07 1.109e-07
15-150 5.382e-07 2.312e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52335 ( -0.111949 0.112419 )
Norm@50keV : 2.94100E-02 ( -0.00210621 0.00210298 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.61 using 59 PHA bins.
# Reduced chi-squared = 1.326 for 57 degrees of freedom
# Null hypothesis probability = 5.012357e-02
Photon flux (15-150 keV) in 1 sec: 3.69507 ( -0.270404 0.270814 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.77964e-07 ( -2.11612e-08 2.12358e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.547762 ( -0.55034 0.492171 )
Epeak [keV] : 75.1859 ( -11.9185 27.1816 )
Norm@50keV : 9.13343E-02 ( -0.0390099 0.0787052 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.03 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 56 degrees of freedom
# Null hypothesis probability = 2.416626e-01
Photon flux (15-150 keV) in 1 sec: 3.58843 ( -0.27569 0.27603 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64846e-07 ( -2.235e-08 2.2441e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.549082 ( -0.468051 0.37766 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 75.2306 ( -9.91978 26.4404 )
Norm@50keV : 9.11727E-02 ( -0.0377328 0.0179509 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.03 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 55 degrees of freedom
# Null hypothesis probability = 2.135041e-01
Photon flux (15-150 keV) in 1 sec: 3.58728 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64363e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.1392 (-1.19839 1.30733)
R^2/D10^2 : 0.423145 (-0.109553 0.14595)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.71 using 59 PHA bins.
# Reduced chi-squared = 1.591 for 57 degrees of freedom
# Null hypothesis probability = 2.998358e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.027e-08 2.530e-09
25- 50 8.124e-08 7.160e-09
50-150 1.272e-07 1.660e-08
15-150 2.288e-07 1.945e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-53.959 -199.363)
Norm : 15.2827 (-1.07233 1.07364)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.87 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 57 degrees of freedom
# Null hypothesis probability = 1.346844e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.805e-08 2.850e-09
25- 50 7.320e-08 6.650e-09
50-150 1.605e-07 4.528e-08
15-150 2.718e-07 4.495e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.61583 (-1.59612 1.96898)
R1^2/D10^2 : 2.60535 (-1.26868 2.83365)
kT2 [keV] : 23.2301 (-3.93857 7.3565)
R2^2/D10^2 : 6.82771E-02 (-0.0454566 0.0776768)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.67 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 55 degrees of freedom
# Null hypothesis probability = 3.099378e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.292e-08 1.151e-08
25- 50 7.840e-08 2.346e-08
50-150 1.555e-07 7.172e-08
15-150 2.668e-07 8.946e-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: 2.03736 ( -0.179952 0.190457 )
Norm@50keV : 2.86912E-03 ( -0.00037006 0.000363061 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.12 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 57 degrees of freedom
# Null hypothesis probability = 3.634997e-01
Photon flux (15-150 keV) in 23.51 sec: 0.437930 ( -0.0451306 0.0451495 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.23471e-07 ( -7.44583e-08 7.57351e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.691085 ( -1.11993 0.89967 )
Epeak [keV] : 40.3347 ( -9.08852 9.5967 )
Norm@50keV : 1.71537E-02 ( -0.0171537 0.0597595 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.01 using 59 PHA bins.
# Reduced chi-squared = 0.9466 for 56 degrees of freedom
# Null hypothesis probability = 5.886812e-01
Photon flux (15-150 keV) in 23.51 sec: 0.419399 ( -0.046426 0.046613 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.616e-07 ( -7.5848e-08 8.19512e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.703559 ( -1.13744 1.94877 )
beta : -4.27933 ( 3.92185 1.6797 )
Epeak [keV] : 40.5201 ( -9.42302 9.34202 )
Norm@50keV : 1.67914E-02 ( -0.0167904 0.333663 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.99 using 59 PHA bins.
# Reduced chi-squared = 0.9634 for 55 degrees of freedom
# Null hypothesis probability = 5.518559e-01
Photon flux (15-150 keV) in 23.51 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) = 1.90e-07
S(50-100 keV) = 1.85e-07
T90 vs. Hardness ratio plot
T90 = 22.6560000181198 sec.
Hardness ratio (energy fluence ratio) = 0.973684
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.16216
Count Ratio (50-100 keV) / (15-25 keV) = 0.574878
Mask shadow pattern
IMX = -6.959719045074152E-01, IMY = 4.649925097246069E-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:
-239.288000 -13.100000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6232 22.0216 0.3 29.6 -122.3 9.4786 41.6 0.7 Crab
140.2736 5.5685 3.4 36.5 115.8 1.4543 3.4 ------ UNKNOWN
135.6889 28.4668 2.5 18.6 81.5 0.9050 4.5 ------ UNKNOWN
159.2576 58.8950 2.2 39.0 17.3 1.3655 5.2 ------ UNKNOWN
193.9568 70.9371 2.7 55.3 5.1 3.6499 4.3 ------ UNKNOWN
116.2015 17.9791 2.5 15.4 156.6 0.7482 4.7 ------ UNKNOWN
119.6984 44.0498 2.3 11.4 0.6 0.7981 5.0 ------ UNKNOWN
103.4813 18.8620 2.1 17.6 -160.5 0.7878 5.5 ------ UNKNOWN
94.7205 -14.6681 2.9 51.6 -173.0 1.6316 4.0 ------ UNKNOWN
115.9866 69.4412 2.4 36.1 -17.1 1.0402 4.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-13.100000 10.412000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.4769 22.0474 7.7 29.7 -122.2 -0.0984 -1.5 8.9 Crab
124.7276 -11.7761 2.6 46.1 148.3 0.5397 4.4 ------ UNKNOWN
84.3027 5.0770 0.8 39.9 -146.3 1.1536 14.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
68.012600 962.769100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6349 22.0173 0.2 16.9 -8.2 38.4853 74.0 0.2 Crab
93.2660 -47.4911 3.0 53.2 166.6 9.7513 3.9 ------ UNKNOWN
97.1681 14.5979 2.2 15.8 46.2 3.0820 5.4 ------ UNKNOWN
64.6670 -8.2541 2.7 23.7 -130.0 2.7135 4.3 ------ UNKNOWN
62.1945 29.7833 2.2 32.4 -43.6 3.8434 5.3 ------ UNKNOWN
44.4833 41.1056 3.9 50.6 -44.6 9.7128 3.0 ------ UNKNOWN
Plot creation:
Sun May 31 07:53:10 EDT 2015