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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
305.9886 33.8524 0.0128 0.0452 143.4648 1.5512219 15.074 TRIG_00668879
Foreground time interval of the image:
-15.136 48.864 (delta_t = 64.000 [sec])
Background time interval of the image:
-239.136 -15.136 (delta_t = 224.000 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of 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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -15.136 sec. to 48.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44034 ( -0.185362 0.185315 )
Norm@50keV : 1.46824E-03 ( -0.000151789 0.000150906 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.39 using 59 PHA bins.
# Reduced chi-squared = 0.9718 for 57 degrees of freedom
# Null hypothesis probability = 5.355693e-01
Photon flux (15-150 keV) in 64 sec: 0.180511 ( -0.0185054 0.0185506 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.00819e-07 ( -1.03761e-07 1.04954e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.136 sec. to 48.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43229 ( -0.184848 0.188088 )
Epeak [keV] : 9999.30 ( -9999.36 -9999.36 )
Norm@50keV : 1.47291E-03 ( -0.00147334 0.00092458 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.41 using 59 PHA bins.
# Reduced chi-squared = 0.9894 for 56 degrees of freedom
# Null hypothesis probability = 4.972466e-01
Photon flux (15-150 keV) in 64 sec: 0.180717 ( -0.018713 0.0183 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.96224e-07 ( -9.94176e-08 1.07354e-07 ) ergs/cm2
Band function
Time interval is from -15.136 sec. to 48.864 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96467 ( -4.96467 -4.96467 )
beta : -1.49450 ( -0.23641 0.201935 )
Epeak [keV] : 22.5139 ( -22.5139 6.25179 )
Norm@50keV : 266.127 ( -26.6642 666471 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.55 using 59 PHA bins.
# Reduced chi-squared = 0.9918 for 55 degrees of freedom
# Null hypothesis probability = 4.917759e-01
Photon flux (15-150 keV) in 64 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] : 15.3019 (-2.30734 2.83047)
R^2/D10^2 : 1.84788E-02 (-0.00813213 0.0142171)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.75 using 59 PHA bins.
# Reduced chi-squared = 1.610 for 57 degrees of freedom
# Null hypothesis probability = 2.405578e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.778e-08 1.161e-08
25- 50 2.338e-07 4.032e-08
50-150 3.758e-07 8.512e-08
15-150 6.673e-07 9.939e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-53.1245 -200)
Norm : 0.738896 (-0.0745087 0.0745087)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.91 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.413838e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.178e-07 2.534e-08
25- 50 2.265e-07 1.221e-07
50-150 4.968e-07 2.697e-07
15-150 8.412e-07 4.246e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.85561 (-1.52511 1.91364)
R1^2/D10^2 : 0.226954 (-0.130417 0.346808)
kT2 [keV] : 34.8006 (-10.0796 28.1341)
R2^2/D10^2 : 1.02020E-03 (-0.00080333 0.00200736)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.96 using 59 PHA bins.
# Reduced chi-squared = 0.9629 for 55 degrees of freedom
# Null hypothesis probability = 5.529593e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.185e-07 4.853e-08
25- 50 2.144e-07 7.482e-08
50-150 6.050e-07 3.174e-07
15-150 9.379e-07 3.606e-07
Peak spectrum fit
Power-law model
Time interval is from 8.364 sec. to 9.364 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39705 ( -1.09191 1.07784 )
Norm@50keV : 1.99890E-03 ( -0.00199905 0.00118851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.22 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 57 degrees of freedom
# Null hypothesis probability = 3.943890e-01
Photon flux (15-150 keV) in 1 sec: 0.243249 ( -0.14307 0.144375 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.93299e-08 ( -1.21408e-08 1.30862e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.364 sec. to 9.364 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.439216 ( -6.39255 7.23571 )
Epeak [keV] : 78.2138 ( -78.0902 -78.0902 )
Norm@50keV : 6.37159E-03 ( -0.00645095 -0.00645095 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.93 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 56 degrees of freedom
# Null hypothesis probability = 3.689409e-01
Photon flux (15-150 keV) in 1 sec: 0.236133 ( -0.14051 0.145064 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79201e-08 ( -1.31816e-08 1.37811e-08 ) ergs/cm2
Band function
Time interval is from 8.364 sec. to 9.364 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.435625 ( -5.17427 0.805793 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 76.4162 ( -56.8817 -76.5507 )
Norm@50keV : 6.55270E-03 ( -0.0065316 22.6972 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.93 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 55 degrees of freedom
# Null hypothesis probability = 3.338964e-01
Photon flux (15-150 keV) in 1 sec: 0.238376 ( 6.76162 -0.142572 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.86653e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.3794 (-15.4256 26.1613)
R^2/D10^2 : 2.63011E-02 (-0.025897 0.701866)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.51 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 57 degrees of freedom
# Null hypothesis probability = 3.843191e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.297e-09 9.170e-10
25- 50 5.271e-09 3.557e-09
50-150 8.577e-09 6.425e-09
15-150 1.514e-08 1.159e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.360 (-199.362 -199.362)
Norm : 1.00896 (-0.587244 0.917423)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.13 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 57 degrees of freedom
# Null hypothesis probability = 3.976468e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.512e-09 1.806e-09
25- 50 4.833e-09 3.500e-09
50-150 1.060e-08 7.265e-09
15-150 1.794e-08 1.247e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.91648 (-7.14814 87.0057)
R1^2/D10^2 : 0.263371 (-0.258499 -0.258499)
kT2 [keV] : 25.8930 (-26.2518 -26.2518)
R2^2/D10^2 : 3.42295E-03 (-0.00329479 0.374776)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.53 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.473030e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.390e-09 1.819e-09
25- 50 4.932e-09 3.340e-09
50-150 1.159e-08 9.040e-09
15-150 1.891e-08 1.029e-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: 1.44034 ( -0.185362 0.185315 )
Norm@50keV : 1.46824E-03 ( -0.000151789 0.000150906 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.39 using 59 PHA bins.
# Reduced chi-squared = 0.9718 for 57 degrees of freedom
# Null hypothesis probability = 5.355693e-01
Photon flux (15-150 keV) in 64 sec: 0.180511 ( -0.0185054 0.0185506 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.00819e-07 ( -1.03761e-07 1.04954e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43229 ( -0.184848 0.188088 )
Epeak [keV] : 9999.30 ( -9999.36 -9999.36 )
Norm@50keV : 1.47291E-03 ( -0.00147334 0.00092458 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.41 using 59 PHA bins.
# Reduced chi-squared = 0.9894 for 56 degrees of freedom
# Null hypothesis probability = 4.972466e-01
Photon flux (15-150 keV) in 64 sec: 0.180717 ( -0.018713 0.0183 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.96224e-07 ( -9.94176e-08 1.07354e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96467 ( -4.96467 -4.96467 )
beta : -1.49450 ( -0.23641 0.201935 )
Epeak [keV] : 22.5139 ( -22.5139 6.25179 )
Norm@50keV : 266.127 ( -26.6642 666471 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.55 using 59 PHA bins.
# Reduced chi-squared = 0.9918 for 55 degrees of freedom
# Null hypothesis probability = 4.917759e-01
Photon flux (15-150 keV) in 64 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) = 2.16e-07
S(50-100 keV) = 3.19e-07
T90 vs. Hardness ratio plot
T90 = 64 sec.
Hardness ratio (energy fluence ratio) = 1.47685
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.03576
Count Ratio (50-100 keV) / (15-25 keV) = 0.901808
Mask shadow pattern
IMX = -6.342125750881634E-04, IMY = -4.698965254778449E-04
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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:
-239.136000 -15.136000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6270 35.4557 0.0 41.8 -9.9 -0.1868 -0.5 10.7 Her X-1
288.8010 10.9470 67.7 27.7 -78.8 0.0566 0.2 0.2 GRS 1915+105
299.6001 35.1935 0.4 5.4 -10.9 6.3607 26.9 0.7 Cyg X-1
308.1334 40.9528 1.7 7.3 76.0 1.6053 7.0 1.1 Cyg X-3
326.2256 38.3140 4.3 17.0 131.7 0.7388 2.7 2.6 Cyg X-2
235.8330 48.6052 3.1 52.8 11.5 3.3652 3.7 ------ UNKNOWN
278.4974 43.7384 2.7 23.4 5.9 1.0941 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-15.136000 48.864000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3633 35.3401 4.7 42.0 -10.0 -0.4111 -2.5 4.6 Her X-1
288.8896 10.7970 15.1 27.8 -79.1 -0.1139 -0.8 10.4 GRS 1915+105
299.5399 35.2341 7.5 5.4 -10.6 0.1559 1.5 3.1 Cyg X-1
308.1767 41.0959 3.8 7.5 75.9 -0.3225 -3.0 9.1 Cyg X-3
326.4292 38.3425 0.0 17.1 131.7 -0.1336 -1.1 12.2 Cyg X-2
305.9886 33.8524 0.8 0.0 143.5 1.5513 15.1 ------ UNKNOWN
266.9156 15.9537 1.8 39.3 -44.4 1.1244 6.2 ------ UNKNOWN
340.8715 -13.5489 2.2 57.9 -158.3 3.1579 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
706.064600 962.951800
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
52.6584 44.4649 2.3 47.3 148.0 4.4565 5.1 ------ UNKNOWN
140.2856 27.6151 2.3 37.0 32.4 1.7590 4.9 ------ UNKNOWN
24.7325 48.5913 2.4 54.4 171.6 4.6855 4.7 ------ UNKNOWN
154.6399 33.4985 2.8 33.4 9.4 1.1843 4.1 ------ UNKNOWN
251.2010 86.2405 2.7 27.5 -130.9 1.1165 4.3 ------ UNKNOWN
297.3433 81.2565 3.7 34.1 -133.8 1.0583 3.1 ------ UNKNOWN
209.6578 54.9917 3.2 36.9 -70.4 1.8123 3.6 ------ UNKNOWN
Plot creation:
Thu Dec 31 13:10:32 EST 2015