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
259.8510 -18.1237 0.0037 40.7650 10.9593 10.2785765 51.806 TRIG_00674734
Foreground time interval of the image:
-7.576 37.484 (delta_t = 45.060 [sec])
Background time interval of the image:
-518.195 -407.172 (delta_t = 111.023 [sec])
-239.696 -7.576 (delta_t = 232.120 [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
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)
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 -7.576 sec. to 37.484 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19177 ( -0.0467533 0.0464309 )
Norm@50keV : 1.54061E-02 ( -0.000418707 0.000418013 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.74 using 59 PHA bins.
# Reduced chi-squared = 0.9954 for 57 degrees of freedom
# Null hypothesis probability = 4.848752e-01
Photon flux (15-150 keV) in 45.06 sec: 1.80631 ( -0.05313 0.05326 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.06027e-06 ( -1.90517e-07 1.90617e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.576 sec. to 37.484 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.734944 ( -0.202535 0.193596 )
Epeak [keV] : 166.842 ( -32.9657 75.2378 )
Norm@50keV : 2.40196E-02 ( -0.00401571 0.00502484 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.56 using 59 PHA bins.
# Reduced chi-squared = 0.7065 for 56 degrees of freedom
# Null hypothesis probability = 9.528441e-01
Photon flux (15-150 keV) in 45.06 sec: 1.76106 ( -0.05586 0.05605 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.95524e-06 ( -1.97812e-07 1.97318e-07 ) ergs/cm2
Band function
Time interval is from -7.576 sec. to 37.484 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.736197 ( -0.1905 0.0982581 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 167.342 ( -17.1112 49.9706 )
Norm@50keV : 2.40031E-02 ( -0.00301302 0.00301795 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.57 using 59 PHA bins.
# Reduced chi-squared = 0.7195 for 55 degrees of freedom
# Null hypothesis probability = 9.419695e-01
Photon flux (15-150 keV) in 45.06 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] : 21.3566 ( )
R^2/D10^2 : 6.74597E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 238.02 using 59 PHA bins.
# Reduced chi-squared = 4.1758 for 57 degrees of freedom
# Null hypothesis probability = 5.587097e-24
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.600e-07 1.455e-08
25- 50 1.351e-06 5.295e-08
50-150 4.597e-06 1.762e-07
15-150 6.207e-06 1.938e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 7.85563 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 238.85 using 59 PHA bins.
# Reduced chi-squared = 4.1903 for 57 degrees of freedom
# Null hypothesis probability = 4.062633e-24
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.814e-07 2.591e-08
25- 50 1.696e-06 5.317e-08
50-150 3.719e-06 1.120e-07
15-150 6.296e-06 2.005e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.70975 (-1.02906 1.15346)
R1^2/D10^2 : 0.670914 (-0.207364 0.326638)
kT2 [keV] : 31.7862 (-2.76981 3.81549)
R2^2/D10^2 : 1.52235E-02 (-0.00496139 0.00584034)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.74 using 59 PHA bins.
# Reduced chi-squared = 0.6680 for 55 degrees of freedom
# Null hypothesis probability = 9.723606e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.432e-07 6.525e-08
25- 50 1.545e-06 1.077e-07
50-150 4.900e-06 3.375e-07
15-150 6.988e-06 4.281e-07
Peak spectrum fit
Power-law model
Time interval is from 6.460 sec. to 7.460 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.984720 ( -0.0987314 0.0972645 )
Norm@50keV : 5.73360E-02 ( -0.00350428 0.0034957 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.18 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 57 degrees of freedom
# Null hypothesis probability = 2.393922e-01
Photon flux (15-150 keV) in 1 sec: 6.59605 ( -0.40964 0.41022 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.23462e-07 ( -3.96003e-08 3.96853e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.460 sec. to 7.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.111769 ( -0.497343 0.446324 )
Epeak [keV] : 127.933 ( -26.2817 70.1071 )
Norm@50keV : 0.137341 ( -0.0483403 0.0833729 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.03 using 59 PHA bins.
# Reduced chi-squared = 0.9291 for 56 degrees of freedom
# Null hypothesis probability = 6.258415e-01
Photon flux (15-150 keV) in 1 sec: 6.43579 ( -0.41737 0.41785 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.09425e-07 ( -4.15536e-08 4.14087e-08 ) ergs/cm2
Band function
Time interval is from 6.460 sec. to 7.460 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.16701E-02 ( -0.45394 2.06439 )
beta : -1.96058 ( 1.90399 0.734821 )
Epeak [keV] : 123.781 ( -66.719 71.107 )
Norm@50keV : 0.143716 ( -0.0519653 1.51214 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.92 using 59 PHA bins.
# Reduced chi-squared = 0.9441 for 55 degrees of freedom
# Null hypothesis probability = 5.928751e-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] : 22.2739 (-1.56789 1.7453)
R^2/D10^2 : 0.238169 (-0.0510891 0.0629221)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.88 using 59 PHA bins.
# Reduced chi-squared = 1.261 for 57 degrees of freedom
# Null hypothesis probability = 8.857969e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.174e-08 2.645e-09
25- 50 1.158e-07 1.030e-08
50-150 4.294e-07 3.840e-08
15-150 5.669e-07 4.060e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 26.8565 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 149.53 using 59 PHA bins.
# Reduced chi-squared = 2.6233 for 57 degrees of freedom
# Null hypothesis probability = 3.108918e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.687e-08 4.925e-09
25- 50 1.286e-07 1.050e-08
50-150 2.821e-07 7.550e-08
15-150 4.777e-07 7.625e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.1349 (-3.85608 5.35515)
R1^2/D10^2 : 1.15237 (-0.661044 2.32931)
kT2 [keV] : 31.2050 (-5.99322 27.8788)
R2^2/D10^2 : 6.67441E-02 (-0.0588057 0.0805222)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.20 using 59 PHA bins.
# Reduced chi-squared = 0.9490 for 55 degrees of freedom
# Null hypothesis probability = 5.824188e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.414e-08 1.411e-08
25- 50 1.235e-07 4.698e-08
50-150 4.540e-07 1.927e-07
15-150 6.117e-07 2.063e-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: 1.19177 ( -0.0467533 0.0464309 )
Norm@50keV : 1.54061E-02 ( -0.000418707 0.000418013 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.74 using 59 PHA bins.
# Reduced chi-squared = 0.9954 for 57 degrees of freedom
# Null hypothesis probability = 4.848752e-01
Photon flux (15-150 keV) in 45.06 sec: 1.80630 ( -0.0531212 0.0532533 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.05942e-06 ( -1.90522e-07 1.90592e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.734945 ( -0.202535 0.193596 )
Epeak [keV] : 166.842 ( -32.9659 75.2376 )
Norm@50keV : 2.40196E-02 ( -0.00401569 0.00502486 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.56 using 59 PHA bins.
# Reduced chi-squared = 0.7065 for 56 degrees of freedom
# Null hypothesis probability = 9.528441e-01
Photon flux (15-150 keV) in 45.06 sec: 1.76096 ( -0.05584 0.05603 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.9583e-06 ( -1.98219e-07 1.97543e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.736197 ( -0.1905 0.0982581 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 167.342 ( -17.1112 49.9706 )
Norm@50keV : 2.40031E-02 ( -0.00301302 0.00301795 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.57 using 59 PHA bins.
# Reduced chi-squared = 0.7195 for 55 degrees of freedom
# Null hypothesis probability = 9.419695e-01
Photon flux (15-150 keV) in 45.06 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) = 1.47e-06
S(50-100 keV) = 2.58e-06
T90 vs. Hardness ratio plot
T90 = 31.1159999370575 sec.
Hardness ratio (energy fluence ratio) = 1.7551
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.91655
Count Ratio (50-100 keV) / (15-25 keV) = 1.96527
Mask shadow pattern
IMX = 8.463877121934957E-01, IMY = -1.638978551286601E-01
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:
-518.195400 -407.172500
-239.696000 -7.576000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3567 35.2453 10.6 39.5 99.7 -1.3259 -1.1 7.6 Her X-1
256.4363 -36.4229 16.4 56.3 -2.7 1.2116 0.7 0.0 GX 349+2
262.8983 -24.7109 242.0 43.7 1.2 0.0283 0.0 6.4 GX 1+4
268.3258 -1.2461 0.0 23.7 26.5 0.2170 0.6 12.6 SW J1753.5-0127
270.2846 -25.0745 96.1 40.3 -7.4 -0.0587 -0.1 0.3 GX 5-1
270.3027 -25.7430 14.5 40.9 -7.9 0.3794 0.8 0.0 GRS 1758-258
273.9137 -13.9518 3.8 29.0 -2.8 1.0348 3.0 7.4 GX 17+2
275.9152 -30.3033 37.1 43.1 -17.5 -0.1586 -0.3 3.9 H1820-303
285.0218 -25.0788 7.3 36.2 -28.0 -0.6563 -1.6 9.5 HT1900.1-2455
288.7363 10.9469 1.6 0.1 35.8 2.0434 7.1 3.7 GRS 1915+105
299.5890 35.2051 0.2 26.2 166.5 15.1972 46.6 0.2 Cyg X-1
308.1076 40.9559 1.9 34.5 172.4 2.5796 6.1 0.2 Cyg X-3
326.1187 38.1291 0.0 43.0 -169.4 -0.1818 -0.4 11.8 Cyg X-2
263.1347 -33.8129 6.1 51.0 -6.2 -1.6004 -1.9 7.4 GX 354-0
260.6924 -35.1517 2.5 53.2 -5.1 4.4066 4.6 ------ UNKNOWN
335.5571 22.6490 3.4 46.1 -144.8 2.0041 3.4 ------ UNKNOWN
345.5946 23.7078 2.5 55.3 -145.1 9.2857 4.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-7.576000 37.484000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3399 35.3467 53.9 39.6 99.8 0.0954 0.2 5.8 Her X-1
256.4317 -36.4197 396.9 56.3 -2.6 -0.0195 -0.0 0.3 GX 349+2
263.1290 -24.7810 5.0 43.6 0.9 0.4921 2.3 6.9 GX 1+4
268.3489 -1.4223 20.5 23.8 26.1 -0.0706 -0.6 2.1 SW J1753.5-0127
270.2278 -25.1325 10.4 40.4 -7.4 -0.1884 -1.1 4.4 GX 5-1
270.3809 -25.6104 170.6 40.7 -7.9 0.0118 0.1 9.0 GRS 1758-258
273.9812 -13.8399 0.0 28.8 -2.8 -0.3173 -2.5 11.9 GX 17+2
275.8274 -30.4051 6.4 43.2 -17.4 0.2960 1.8 5.5 H1820-303
285.0648 -24.9546 9.5 36.1 -28.1 0.1695 1.2 2.6 HT1900.1-2455
289.0103 10.9866 0.0 0.2 -129.4 0.1389 1.4 12.7 GRS 1915+105
299.5727 35.1869 173.5 26.1 166.5 -0.0083 -0.1 1.2 Cyg X-1
307.8716 40.9455 5.4 34.4 172.1 0.2923 2.1 10.8 Cyg X-3
326.2741 38.2449 5.2 43.2 -169.5 -0.3473 -2.2 6.7 Cyg X-2
263.1286 -33.7659 4.7 51.0 -6.2 0.6717 2.5 8.1 GX 354-0
259.8510 -18.1237 0.2 40.8 11.0 10.2782 51.8 ------ UNKNOWN
293.3451 -18.3826 2.2 29.7 -42.6 0.6245 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
241.604600 357.686000
360.304000 412.204590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.1762 40.9885 5.7 58.1 -15.9 1.5608 2.1 3.7 Cyg X-3
326.2846 38.3955 3.3 44.0 -16.6 0.8342 3.5 6.9 Cyg X-2
56.7383 1.7196 2.1 47.3 142.2 4.0409 5.4 ------ UNKNOWN
309.1987 36.3895 2.2 57.2 -21.3 3.2896 5.2 ------ UNKNOWN
335.4808 12.9904 2.6 35.1 -56.9 0.9940 4.5 ------ UNKNOWN
13.3043 -36.8263 3.5 55.3 -144.9 3.0575 3.3 ------ UNKNOWN
316.2640 19.7284 2.9 52.1 -42.2 3.2003 4.0 ------ UNKNOWN
Plot creation:
Fri Mar 18 11:37:02 EDT 2016