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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
356.9636 -79.9134 0.0067 49.0687 159.1106 8.2755307 28.566 TRIG_00592916
Foreground time interval of the image:
-19.208 16.189 (delta_t = 35.397 [sec])
Background time interval of the image:
-385.011 -352.082 (delta_t = 32.929 [sec])
-239.712 -19.208 (delta_t = 220.504 [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
Multiple GTIs in the spectrum
tstart tstop
-19.208000 21.400100
22.288000 117.368000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50261 ( -0.042262 0.0422653 )
Norm@50keV : 1.22210E-02 ( -0.000271842 0.000271828 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.00 using 59 PHA bins.
# Reduced chi-squared = 0.9123 for 57 degrees of freedom
# Null hypothesis probability = 6.626207e-01
Photon flux (15-150 keV) in 135.7 sec: 1.52673 ( -0.0388102 0.0389456 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57256e-05 ( -3.61102e-07 3.61342e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-19.208000 21.400100
22.288000 117.368000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32410 ( -0.173199 0.163955 )
Epeak [keV] : 215.353 ( -78.1291 1535.19 )
Norm@50keV : 1.46613E-02 ( -0.00216562 0.00275233 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.68 using 59 PHA bins.
# Reduced chi-squared = 0.8692 for 56 degrees of freedom
# Null hypothesis probability = 7.456440e-01
Photon flux (15-150 keV) in 135.7 sec: 1.50485 ( -0.04325 0.04349 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.55694e-05 ( -3.94344e-07 3.92309e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-19.208000 21.400100
22.288000 117.368000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.969457 ( -0.432032 1.69734 )
beta : -1.56950 ( 1.56945 0.0725153 )
Epeak [keV] : 79.4351 ( -46.0171 353.736 )
Norm@50keV : 2.39673E-02 ( -0.0109647 0.125509 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.66 using 59 PHA bins.
# Reduced chi-squared = 0.8666 for 55 degrees of freedom
# Null hypothesis probability = 7.482089e-01
Photon flux (15-150 keV) in 135.7 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] : 17.3818 ( )
R^2/D10^2 : 9.97214E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 460.42 using 59 PHA bins.
# Reduced chi-squared = 8.0775 for 57 degrees of freedom
# Null hypothesis probability = 1.887400e-64
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.274e-07 3.705e-08
25- 50 3.726e-06 1.215e-07
50-150 8.092e-06 3.304e-07
15-150 1.265e-05 3.257e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 6.27836 (-0.139657 0.139652)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.88 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 57 degrees of freedom
# Null hypothesis probability = 2.476395e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.122e-06 5.360e-08
25- 50 4.081e-06 9.703e-08
50-150 8.951e-06 2.185e-07
15-150 1.515e-05 3.867e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.92588 (-0.66529 0.703454)
R1^2/D10^2 : 0.988835 (-0.242655 0.347798)
kT2 [keV] : 29.6463 (-2.41771 3.09343)
R2^2/D10^2 : 1.24842E-02 (-0.0036964 0.00453364)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.12 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 55 degrees of freedom
# Null hypothesis probability = 4.325464e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.748e-06 1.384e-07
25- 50 4.047e-06 1.832e-07
50-150 9.647e-06 5.869e-07
15-150 1.544e-05 8.278e-07
Peak spectrum fit
Power-law model
Time interval is from 6.420 sec. to 7.420 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03015 ( -0.159704 0.155657 )
Norm@50keV : 5.58294E-02 ( -0.0054997 0.00547322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.49 using 59 PHA bins.
# Reduced chi-squared = 0.9735 for 57 degrees of freedom
# Null hypothesis probability = 5.319338e-01
Photon flux (15-150 keV) in 1 sec: 6.43920 ( -0.650199 0.651943 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.97386e-07 ( -5.99763e-08 6.01004e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.420 sec. to 7.420 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.288481 ( -0.826875 0.690829 )
Epeak [keV] : 137.367 ( -43.426 754.396 )
Norm@50keV : 0.117050 ( -0.0575115 0.139533 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.13 using 59 PHA bins.
# Reduced chi-squared = 0.9309 for 56 degrees of freedom
# Null hypothesis probability = 6.221417e-01
Photon flux (15-150 keV) in 1 sec: 6.30568 ( -0.66221 0.66478 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.88555e-07 ( -6.2718e-08 6.2093e-08 ) ergs/cm2
Band function
Time interval is from 6.420 sec. to 7.420 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99995 ( -4.99995 -4.99995 )
beta : -1.19165 ( -0.364574 0.20245 )
Epeak [keV] : 36.9675 ( -36.9675 9.35329 )
Norm@50keV : 411.116 ( -39.2773 1.13416e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.39 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 55 degrees of freedom
# Null hypothesis probability = 4.598737e-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] : 21.9455 (-2.41472 2.87278)
R^2/D10^2 : 0.240242 (-0.0791865 0.11108)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.51 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 57 degrees of freedom
# Null hypothesis probability = 3.178565e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.144e-08 4.250e-09
25- 50 1.132e-07 1.696e-08
50-150 4.073e-07 5.885e-08
15-150 5.419e-07 6.565e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 26.7886 (-2.69758 2.6973)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.76 using 59 PHA bins.
# Reduced chi-squared = 1.487 for 57 degrees of freedom
# Null hypothesis probability = 9.948333e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.672e-08 1.969e-08
25- 50 1.284e-07 5.721e-08
50-150 2.815e-07 1.529e-07
15-150 4.766e-07 1.847e-07
Double BB
R1^2/D10^2 : 9.07016E-03 ( )
kT2 [keV] : 14.4275 (-9.90985 4.78438)
R2^2/D10^2 : 0.623711 (-0.339231 15.8761)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.59 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.56 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.54 using 59 PHA bins.
# Reduced chi-squared = 0.9562 for 55 degrees of freedom
# Reduced chi-squared = 0.9556 for 55 degrees of freedom
# Reduced chi-squared = 0.9553 for 55 degrees of freedom
# Null hypothesis probability = 5.672677e-01
# Null hypothesis probability = 5.685694e-01
# Null hypothesis probability = 5.692135e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.188e-08 1.770e-08
25- 50 1.247e-07 6.765e-08
50-150 4.303e-07 2.207e-07
15-150 5.868e-07 2.936e-07
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: 1.17254 ( -0.0725523 0.0717164 )
Norm@50keV : 1.70997E-02 ( -0.000728854 0.000727104 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.93 using 59 PHA bins.
# Reduced chi-squared = 1.174 for 57 degrees of freedom
# Null hypothesis probability = 1.728904e-01
Photon flux (15-150 keV) in 35.4 sec: 1.99975 ( -0.0912705 0.0915178 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.18997e-06 ( -2.64146e-07 2.64336e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.802878 ( -0.310213 0.289776 )
Epeak [keV] : 192.822 ( -61.2534 420.921 )
Norm@50keV : 2.46767E-02 ( -0.00603153 0.00852955 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.12 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 56 degrees of freedom
# Null hypothesis probability = 2.673368e-01
Photon flux (15-150 keV) in 35.4 sec: 1.96537 ( -0.09466 0.09498 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.12615e-06 ( -2.72792e-07 2.71872e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.128322 ( -0.6999 4.81728 )
beta : -1.31209 ( 1.32334 0.141591 )
Epeak [keV] : 76.0806 ( -44.2879 159.585 )
Norm@50keV : 6.26600E-02 ( -0.0395989 253.6 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.96 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 55 degrees of freedom
# Null hypothesis probability = 2.701352e-01
Photon flux (15-150 keV) in 35.4 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) = 3.89e-06
S(50-100 keV) = 5.50e-06
T90 vs. Hardness ratio plot
T90 = 106.487999975681 sec.
Hardness ratio (energy fluence ratio) = 1.41388
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.43237
Count Ratio (50-100 keV) / (15-25 keV) = 1.17796
Mask shadow pattern
IMX = -1.077361481201155E+00, IMY = -4.111765323249528E-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:
-385.011410 -352.082000
-239.712000 -19.208000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
69.4509 -68.4331 2.8 39.1 132.6 1.8699 4.1 ------ UNKNOWN
74.2462 -46.9914 2.2 30.4 97.4 1.7221 5.2 ------ UNKNOWN
73.3815 9.6435 1.9 54.8 14.8 6.3846 6.1 ------ UNKNOWN
313.5589 -61.3271 4.4 58.3 -175.5 3.3159 2.6 ------ UNKNOWN
317.1692 -57.3009 3.5 57.4 -170.4 3.0585 3.3 ------ UNKNOWN
46.8650 8.2331 2.4 42.7 -16.5 1.3091 4.8 ------ UNKNOWN
44.2620 15.1972 2.4 49.2 -21.5 2.0734 4.9 ------ UNKNOWN
42.8477 25.1050 3.6 58.9 -24.4 4.3178 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-19.208000 16.188600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
356.9636 -79.9134 0.4 49.1 159.1 8.2755 28.5 ------ UNKNOWN
55.8340 -48.1599 2.3 19.8 113.0 0.4318 5.1 ------ UNKNOWN
22.1404 -30.3756 1.9 13.7 -110.3 0.4189 5.9 ------ UNKNOWN
57.2765 22.0116 1.9 58.6 -8.5 2.1693 6.0 ------ UNKNOWN
15.8891 -25.3981 2.5 20.8 -102.2 0.3708 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
86.188600 823.088600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2401 -60.7677 5.4 39.2 79.4 3.7114 2.1 9.0 Cen X-3
186.6630 -62.6620 4.4 37.3 91.9 3.4062 2.6 6.5 GX 301-2
264.6210 -44.4360 5.7 46.8 162.7 2.2012 2.0 5.3 4U 1735-44
356.8801 -79.9100 0.8 0.0 -121.3 5.7304 14.6 ------ UNKNOWN
282.7545 -29.4182 4.7 58.3 -175.4 6.7270 2.5 ------ UNKNOWN
55.9264 -59.1264 2.3 27.0 -19.5 1.9145 5.1 ------ UNKNOWN
9.2582 -39.1706 2.5 41.0 -80.8 8.7317 4.6 ------ UNKNOWN
3.6098 -39.1710 4.9 40.8 -87.5 5.2228 2.4 ------ UNKNOWN
Plot creation:
Sat May 30 13:58:23 EDT 2015