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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
291.4489 67.7042 0.0040 20.5684 -88.2754 6.2194634 47.831 TRIG_00451165
Foreground time interval of the image:
-16.912 71.613 (delta_t = 88.525 [sec])
Background time interval of the image:
-239.688 -16.912 (delta_t = 222.776 [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 -16.912 sec. to 86.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04046 ( -0.0699787 0.0709526 )
Norm@50keV : 3.64844E-03 ( -0.00014537 0.000144445 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.30 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 57 degrees of freedom
# Null hypothesis probability = 4.639713e-01
Photon flux (15-150 keV) in 103.2 sec: 0.557701 ( -0.0207514 0.0208206 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.48086e-06 ( -1.30332e-07 1.30891e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -16.912 sec. to 86.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49752 ( -0.326246 0.302031 )
Epeak [keV] : 41.9165 ( -9.06014 6.99931 )
Norm@50keV : 7.09712E-03 ( -0.00215706 0.00344701 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.35 using 59 PHA bins.
# Reduced chi-squared = 0.8455 for 56 degrees of freedom
# Null hypothesis probability = 7.881714e-01
Photon flux (15-150 keV) in 103.2 sec: 0.535895 ( -0.023592 0.023713 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.29623e-06 ( -1.61714e-07 1.63035e-07 ) ergs/cm2
Band function
Time interval is from -16.912 sec. to 86.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14391 ( -0.577513 1.24589 )
beta : -2.32802 ( 2.32804 0.198243 )
Epeak [keV] : 38.1194 ( -8.41014 8.76689 )
Norm@50keV : 1.18712E-02 ( -0.00618722 0.0804092 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.10 using 59 PHA bins.
# Reduced chi-squared = 0.8382 for 55 degrees of freedom
# Null hypothesis probability = 7.980749e-01
Photon flux (15-150 keV) in 103.2 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.31612e-06 ( -3.31539e-06 -1.59785e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.9023 ( )
R^2/D10^2 : 0.173688 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 179.56 using 59 PHA bins.
# Reduced chi-squared = 3.1501 for 57 degrees of freedom
# Null hypothesis probability = 1.315401e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.443e-07 2.936e-08
25- 50 1.242e-06 4.747e-08
50-150 8.282e-07 7.678e-08
15-150 2.515e-06 9.959e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 67.8645 (-7.22798 8.61465)
Norm : 2.69595 (-0.170405 0.184831)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.11 using 59 PHA bins.
# Reduced chi-squared = 0.8440 for 57 degrees of freedom
# Null hypothesis probability = 7.930191e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.113e-07 3.865e-08
25- 50 1.122e-06 3.922e-08
50-150 1.408e-06 1.187e-07
15-150 3.242e-06 1.290e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.29614 (-0.858638 0.893715)
R1^2/D10^2 : 0.997923 (-0.360005 0.696663)
kT2 [keV] : 19.4986 (-2.71755 4.00838)
R2^2/D10^2 : 1.27868E-02 (-0.00684616 0.0116236)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.01 using 59 PHA bins.
# Reduced chi-squared = 0.9637 for 55 degrees of freedom
# Null hypothesis probability = 5.511936e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.771e-07 8.586e-08
25- 50 1.119e-06 1.016e-07
50-150 1.414e-06 2.465e-07
15-150 3.210e-06 3.540e-07
Peak spectrum fit
Power-law model
Time interval is from 4.732 sec. to 5.732 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73248 ( -0.210717 0.220727 )
Norm@50keV : 9.91937E-03 ( -0.00144132 0.00141378 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.04 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 57 degrees of freedom
# Null hypothesis probability = 3.329382e-01
Photon flux (15-150 keV) in 1 sec: 1.33271 ( -0.167503 0.167531 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.16313e-08 ( -1.36783e-08 1.3964e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.732 sec. to 5.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.789953 ( -1.12906 0.876069 )
Epeak [keV] : 56.8367 ( -13.8585 121.509 )
Norm@50keV : 3.31861E-02 ( -0.0331853 0.109088 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.60 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 56 degrees of freedom
# Null hypothesis probability = 4.159315e-01
Photon flux (15-150 keV) in 1 sec: 1.29363 ( -0.17133 0.17132 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.4481e-08 ( -1.46067e-08 1.53367e-08 ) ergs/cm2
Band function
Time interval is from 4.732 sec. to 5.732 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.789899 ( -0.51313 1.54679 )
beta : -10.0000 ( 10 3.85469e-13 )
Epeak [keV] : 56.8256 ( -13.8633 122.245 )
Norm@50keV : 3.31876E-02 ( -0.0331876 0.109208 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.60 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 55 degrees of freedom
# Null hypothesis probability = 3.793759e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.55864e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.6834 (-1.61601 1.93316)
R^2/D10^2 : 0.366332 (-0.15748 0.265534)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.21 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 57 degrees of freedom
# Null hypothesis probability = 1.890176e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.055e-08 2.475e-09
25- 50 3.215e-08 5.200e-09
50-150 2.591e-08 7.950e-09
15-150 6.862e-08 1.175e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 108.455 (-39.5891 90.3062)
Norm : 5.84526 (-0.884119 1.09784)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.40 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 57 degrees of freedom
# Null hypothesis probability = 4.238273e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.527e-08 2.470e-09
25- 50 2.682e-08 4.455e-09
50-150 4.545e-08 2.640e-08
15-150 8.754e-08 2.891e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.93610 (-3.93208 3.19993)
R1^2/D10^2 : 1.48974 (-0.980897 31.6773)
kT2 [keV] : 20.2416 (-7.34096 25.3034)
R2^2/D10^2 : 3.32919E-02 (-0.0313504 0.196439)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.81 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 55 degrees of freedom
# Null hypothesis probability = 3.719176e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.402e-08 8.110e-09
25- 50 2.848e-08 1.492e-08
50-150 4.243e-08 2.314e-08
15-150 8.493e-08 4.395e-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: 2.02451 ( -0.0704989 0.0714769 )
Norm@50keV : 3.95628E-03 ( -0.000157758 0.000156756 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.70 using 59 PHA bins.
# Reduced chi-squared = 0.9772 for 57 degrees of freedom
# Null hypothesis probability = 5.239216e-01
Photon flux (15-150 keV) in 88.52 sec: 0.600232 ( -0.0224771 0.0225537 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.23419e-06 ( -1.21906e-07 1.22388e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55083 ( -0.316787 0.294288 )
Epeak [keV] : 43.4023 ( -10.4851 8.60047 )
Norm@50keV : 7.04071E-03 ( -0.00207827 0.00326333 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.83 using 59 PHA bins.
# Reduced chi-squared = 0.8542 for 56 degrees of freedom
# Null hypothesis probability = 7.729913e-01
Photon flux (15-150 keV) in 88.52 sec: 0.579423 ( -0.025488 0.025586 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08539e-06 ( -1.50112e-07 1.51033e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.55100 ( -0.258195 0.333693 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 43.3962 ( -10.4849 8.59661 )
Norm@50keV : 7.03771E-03 ( -0.00207721 0.00324669 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.83 using 59 PHA bins.
# Reduced chi-squared = 0.8697 for 55 degrees of freedom
# Null hypothesis probability = 7.424832e-01
Photon flux (15-150 keV) in 88.52 sec: 0.577800 ( 6.4222 -0.028491 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.10277e-06 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.06e-06
S(50-100 keV) = 1.03e-06
T90 vs. Hardness ratio plot
T90 = 79.3999999761581 sec.
Hardness ratio (energy fluence ratio) = 0.971698
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.10773
Count Ratio (50-100 keV) / (15-25 keV) = 0.516445
Mask shadow pattern
IMX = 1.129350651745802E-02, IMY = 3.750767460257233E-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:
-239.688000 -16.912000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4473 35.2616 14.8 22.4 40.6 -0.1594 -0.8 4.9 Her X-1
288.7683 10.9500 3.9 54.7 0.4 2.0101 2.9 1.8 GRS 1915+105
299.5295 35.1884 3.1 38.9 -28.7 0.9909 3.6 3.1 Cyg X-1
308.1612 40.9463 3.1 39.3 -42.8 1.0959 3.7 2.3 Cyg X-3
250.4528 47.2924 2.9 10.3 50.5 0.6499 4.0 ------ UNKNOWN
288.7285 13.9804 2.5 51.9 -1.1 2.0878 4.5 ------ UNKNOWN
143.5470 50.3880 2.4 56.9 -179.0 5.0512 4.8 ------ UNKNOWN
260.5675 57.0773 3.7 5.1 -41.0 0.5194 3.1 ------ UNKNOWN
97.2209 65.6600 5.1 55.2 -145.2 3.0170 2.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-16.912000 71.612620
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4932 35.5111 154.0 22.2 40.5 -0.0102 -0.1 10.3 Her X-1
288.7329 10.8773 18.1 54.7 0.5 0.3267 0.6 5.6 GRS 1915+105
299.4263 35.3075 6.9 38.8 -28.7 -0.3038 -1.7 10.2 Cyg X-1
307.9224 40.8471 10.5 39.2 -42.5 0.2193 1.1 10.6 Cyg X-3
183.0235 36.5402 2.3 48.5 142.7 2.7107 5.1 ------ UNKNOWN
281.1123 23.9714 2.5 39.8 2.2 0.8449 4.5 ------ UNKNOWN
291.4488 67.7042 0.2 20.6 -88.3 6.2196 47.8 ------ UNKNOWN
320.5872 65.5945 2.1 32.1 -85.9 1.0554 5.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
115.612580 962.416100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4614 35.3097 20.6 38.5 54.0 -0.6251 -0.6 2.0 Her X-1
299.5658 35.2064 1.1 32.8 -10.3 5.3631 10.2 1.2 Cyg X-1
308.1146 40.9417 1.0 28.3 -25.2 5.1288 11.0 0.7 Cyg X-3
326.0633 38.4470 4.9 35.0 -49.0 1.5056 2.3 9.1 Cyg X-2
119.2565 57.9702 3.9 54.2 176.9 5.6574 2.9 ------ UNKNOWN
308.0714 37.5997 2.3 31.5 -23.7 2.4078 5.0 ------ UNKNOWN
Plot creation:
Sat May 30 22:33:35 EDT 2015