Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
214.0198 -17.6664 0.0145 14.2243 -167.1569 0.1175101 13.320 TRIG_00668543
Foreground time interval of the image:
-0.036 0.276 (delta_t = 0.312 [sec])
Background time interval of the image:
-67.499 -0.036 (delta_t = 67.463 [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 0.256000
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 0.256000
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 0.256000
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 -0.036 sec. to 0.276 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.824371 ( -0.203026 0.196566 )
Norm@50keV : 2.31150E-02 ( -0.00284636 0.00283681 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.96 using 59 PHA bins.
# Reduced chi-squared = 0.9642 for 57 degrees of freedom
# Null hypothesis probability = 5.519268e-01
Photon flux (15-150 keV) in 0.312 sec: 2.65468 ( -0.32399 0.3243 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.34363e-08 ( -1.11935e-08 1.12931e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.036 sec. to 0.276 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.583979 ( -1.23273 0.968552 )
Epeak [keV] : 101.966 ( -25.0876 99.3817 )
Norm@50keV : 0.101308 ( -0.0637016 0.250547 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.27 using 59 PHA bins.
# Reduced chi-squared = 0.8619 for 56 degrees of freedom
# Null hypothesis probability = 7.591867e-01
Photon flux (15-150 keV) in 0.312 sec: 2.53317 ( -0.33594 0.33578 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.65729e-08 ( -1.26091e-08 1.26085e-08 ) ergs/cm2
Band function
Time interval is from -0.036 sec. to 0.276 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99999 ( -5.0229e-05 -4.99999 )
beta : -1.33626 ( -0.518707 0.339035 )
Epeak [keV] : 46.9547 ( -10.4656 7.98883 )
Norm@50keV : 45.7123 ( -5.4008 132.179 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.28 using 59 PHA bins.
# Reduced chi-squared = 0.8414 for 55 degrees of freedom
# Null hypothesis probability = 7.926765e-01
Photon flux (15-150 keV) in 0.312 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] : 21.9507 (-3.03941 3.80623)
R^2/D10^2 : 0.102607 (-0.0395901 0.0599057)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.79 using 59 PHA bins.
# Reduced chi-squared = 0.8736 for 57 degrees of freedom
# Null hypothesis probability = 7.397560e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.858e-09 6.831e-10
25- 50 1.509e-08 2.613e-09
50-150 5.432e-08 1.225e-08
15-150 7.227e-08 1.285e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-23.7947 -200)
Norm : 9.89150 (-1.3107 1.3107)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.91 using 59 PHA bins.
# Reduced chi-squared = 1.507 for 57 degrees of freedom
# Null hypothesis probability = 7.960060e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.685e-09 4.343e-09
25- 50 1.478e-08 8.318e-09
50-150 3.242e-08 1.810e-08
15-150 5.489e-08 3.083e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 44.7857 (-45.3042 -45.3042)
R1^2/D10^2 : 6.83720E-03 (-0.00637631 0.113829)
kT2 [keV] : 15.3733 (-15.5008 -15.5008)
R2^2/D10^2 : 0.195159 (-0.193487 -0.193487)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.41 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.39 using 59 PHA bins.
# Reduced chi-squared = 0.8620 for 55 degrees of freedom
# Reduced chi-squared = 0.8617 for 55 degrees of freedom
# Null hypothesis probability = 7.565557e-01
# Null hypothesis probability = 7.572784e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.526e-09 2.206e-09
25- 50 1.573e-08 1.066e-08
50-150 5.875e-08 3.677e-08
15-150 7.801e-08 6.572e-08
Peak spectrum fit
Power-law model
Time interval is from -0.378 sec. to 0.622 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.927100 ( -0.322195 0.303625 )
Norm@50keV : 7.30736E-03 ( -0.00132434 0.0013133 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.09 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 57 degrees of freedom
# Null hypothesis probability = 4.348806e-01
Photon flux (15-150 keV) in 1 sec: 0.839045 ( -0.152114 0.152736 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.1169e-08 ( -1.55409e-08 1.57012e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.378 sec. to 0.622 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.322614 ( -1.50958 0.848305 )
Epeak [keV] : 159.557 ( -159.558 -159.558 )
Norm@50keV : 1.35369E-02 ( -0.00727411 0.0430815 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.34 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 56 degrees of freedom
# Null hypothesis probability = 4.251674e-01
Photon flux (15-150 keV) in 1 sec: 0.818779 ( -0.157238 0.1577 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.86466e-08 ( -1.67182e-08 1.65848e-08 ) ergs/cm2
Band function
Time interval is from -0.378 sec. to 0.622 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.319568 ( 0.571831 1.59004 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 159.724 ( -61.9125 194.491 )
Norm@50keV : 1.35514E-02 ( -0.00727438 0.0431835 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.34 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 55 degrees of freedom
# Null hypothesis probability = 3.883635e-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] : 23.0472 (-4.96033 7.05738)
R^2/D10^2 : 2.65581E-02 (-0.0147598 0.0301615)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.62 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 57 degrees of freedom
# Null hypothesis probability = 3.465991e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.554e-09 1.093e-09
25- 50 1.387e-08 4.612e-09
50-150 5.504e-08 1.820e-08
15-150 7.146e-08 2.562e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-47.5863 -200)
Norm : 3.36055 (-0.631339 0.631339)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.62 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 57 degrees of freedom
# Null hypothesis probability = 1.393679e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.367e-09 4.848e-09
25- 50 1.610e-08 9.380e-09
50-150 3.530e-08 2.032e-08
15-150 5.976e-08 3.491e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.09915 (-4.94668 -9.12233)
R1^2/D10^2 : 0.229498 (-0.196721 2.17741)
kT2 [keV] : 34.2602 (-32.3434 -34.3304)
R2^2/D10^2 : 6.65912E-03 (-0.00599473 0.0135683)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.52 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 55 degrees of freedom
# Null hypothesis probability = 4.178253e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.843e-09 2.880e-09
25- 50 1.533e-08 8.255e-09
50-150 5.985e-08 3.185e-08
15-150 8.003e-08 3.941e-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: 0.824371 ( -0.203026 0.196566 )
Norm@50keV : 2.31150E-02 ( -0.00284636 0.00283681 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.96 using 59 PHA bins.
# Reduced chi-squared = 0.9642 for 57 degrees of freedom
# Null hypothesis probability = 5.519268e-01
Photon flux (15-150 keV) in 0.312 sec: 2.65471 ( -0.32399 0.324301 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.34254e-08 ( -1.11876e-08 1.12996e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.584016 ( -1.23273 0.968556 )
Epeak [keV] : 101.965 ( -25.0874 99.3819 )
Norm@50keV : 0.101312 ( -0.0637021 0.250547 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.27 using 59 PHA bins.
# Reduced chi-squared = 0.8619 for 56 degrees of freedom
# Null hypothesis probability = 7.591867e-01
Photon flux (15-150 keV) in 0.312 sec: 2.53317 ( -0.33594 0.33578 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.66094e-08 ( -1.26132e-08 1.26238e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99999 ( -14.9998 -4.99999 )
beta : -1.33626 ( -0.518707 0.339035 )
Epeak [keV] : 46.9547 ( -10.4656 7.98883 )
Norm@50keV : 45.7123 ( -5.4008 132.179 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.28 using 59 PHA bins.
# Reduced chi-squared = 0.8414 for 55 degrees of freedom
# Null hypothesis probability = 7.926765e-01
Photon flux (15-150 keV) in 0.312 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) = 1.37e-08
S(50-100 keV) = 3.09e-08
T90 vs. Hardness ratio plot
T90 = 0.275999963283539 sec.
Hardness ratio (energy fluence ratio) = 2.25547
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 3.28897
Count Ratio (50-100 keV) / (15-25 keV) = 3.52619
Mask shadow pattern
IMX = -2.471490745748556E-01, IMY = 5.634636703088051E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
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:
-67.499400 -0.036000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3029 -60.6036 2.7 38.8 17.4 0.7207 4.3 1.2 Cen X-3
186.6402 -62.7296 3.6 34.8 5.8 0.4339 3.2 2.5 GX 301-2
244.9837 -15.6536 1.1 37.0 -116.8 2.1989 11.0 0.8 Sco X-1
255.9403 -37.8528 2.8 39.8 -77.6 1.6206 4.1 2.3 4U 1700-377
256.4871 -36.4958 64.3 40.4 -79.7 0.0728 0.2 5.0 GX 349+2
127.5362 -84.6796 2.7 58.5 -5.1 2.8525 4.3 ------ UNKNOWN
245.4680 -7.6297 2.5 42.0 -126.8 1.1349 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.036000 0.276000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3492 -60.8083 6.5 38.9 17.1 0.0253 1.8 11.2 Cen X-3
186.3370 -62.7874 13.1 34.9 5.9 0.0103 0.9 8.8 GX 301-2
245.0687 -15.5783 9.5 37.1 -116.9 0.0222 1.2 6.4 Sco X-1
255.9342 -37.7347 7.6 39.8 -77.8 0.0525 1.5 7.0 4U 1700-377
256.4194 -36.5033 7.5 40.3 -79.7 -0.0586 -1.5 4.9 GX 349+2
213.0662 11.1716 2.3 42.2 176.2 0.0752 4.9 ------ UNKNOWN
214.0198 -17.6664 0.9 14.2 -167.2 0.1175 13.3 ------ UNKNOWN
232.9542 7.5313 2.2 45.2 -155.1 0.0828 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
71.700600 201.100600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4564 -60.6016 3.6 39.1 16.8 0.7298 3.2 4.3 Cen X-3
186.5787 -62.7509 1.9 35.2 5.3 1.1885 6.0 2.4 GX 301-2
244.9642 -15.6200 0.7 37.2 -115.8 4.5009 15.8 1.5 Sco X-1
255.9791 -37.8289 1.5 40.4 -76.9 4.5343 7.8 1.0 4U 1700-377
256.4380 -36.3765 4.1 40.9 -79.1 1.8266 2.9 2.8 GX 349+2
201.5287 12.8337 2.7 43.4 160.2 1.4430 4.3 ------ UNKNOWN
155.2941 -82.7835 2.7 55.6 -4.3 2.3078 4.3 ------ UNKNOWN
241.9469 -56.8839 2.5 35.8 -43.0 1.0169 4.6 ------ UNKNOWN
Plot creation:
Sat Mar 19 22:25:28 EDT 2016