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
277.5618 -62.3058 0.0161 22.0118 -100.5814 0.4240162 12.002 TRIG_00279494
Foreground time interval of the image:
0.648 9.176 (delta_t = 8.528 [sec])
Background time interval of the image:
-239.352 0.648 (delta_t = 240.000 [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 3.072000
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 3.072000
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 3.072000
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 0.648 sec. to 9.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90761 ( -0.242214 0.25493 )
Norm@50keV : 2.78739E-03 ( -0.000460336 0.000449233 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.08 using 59 PHA bins.
# Reduced chi-squared = 1.282 for 57 degrees of freedom
# Null hypothesis probability = 7.419871e-02
Photon flux (15-150 keV) in 8.528 sec: 0.401318 ( -0.0545104 0.054538 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18559e-07 ( -3.47681e-08 3.56897e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.648 sec. to 9.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18036 ( -1.33212 0.985554 )
Epeak [keV] : 46.3580 ( )
Norm@50keV : 7.39734E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.63 using 59 PHA bins.
# Reduced chi-squared = 1.279 for 56 degrees of freedom
# Null hypothesis probability = 7.784088e-02
Photon flux (15-150 keV) in 8.528 sec: 0.390173 ( -0.056536 0.056643 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01526e-07 ( -3.91316e-08 4.25684e-08 ) ergs/cm2
Band function
Time interval is from 0.648 sec. to 9.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18079 ( -1.61102 0.722181 )
beta : -10.00000 ( 10 6.34284e-11 )
Epeak [keV] : 46.3528 ( -14.5498 -46.3528 )
Norm@50keV : 7.39238E-03 ( -0.000994079 0.0385422 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.63 using 59 PHA bins.
# Reduced chi-squared = 1.302 for 55 degrees of freedom
# Null hypothesis probability = 6.538476e-02
Photon flux (15-150 keV) in 8.528 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08042e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.0317 (-1.54047 1.87578)
R^2/D10^2 : 0.185958 (-0.0895702 0.167845)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.42 using 59 PHA bins.
# Reduced chi-squared = 1.411 for 57 degrees of freedom
# Null hypothesis probability = 2.221028e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.254e-08 7.633e-09
25- 50 8.126e-08 1.549e-08
50-150 4.280e-08 1.443e-08
15-150 1.566e-07 2.865e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 74.4116 (-26.1164 54.8329)
Norm : 1.93685 (-0.373537 0.479044)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.63 using 59 PHA bins.
# Reduced chi-squared = 1.257 for 57 degrees of freedom
# Null hypothesis probability = 9.190209e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.263e-08 8.149e-09
25- 50 6.892e-08 1.162e-08
50-150 9.254e-08 4.638e-08
15-150 2.041e-07 5.155e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.27990 (-2.00644 2.43782)
R1^2/D10^2 : 0.778524 (-0.511241 2.18489)
kT2 [keV] : 20.1997 (-7.17794 37.4075)
R2^2/D10^2 : 8.62621E-03 (-0.00834888 0.0457102)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.33 using 59 PHA bins.
# Reduced chi-squared = 1.279 for 55 degrees of freedom
# Null hypothesis probability = 7.978749e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.280e-08 2.413e-08
25- 50 6.962e-08 3.527e-08
50-150 9.200e-08 5.351e-08
15-150 2.044e-07 1.063e-07
Peak spectrum fit
Power-law model
Time interval is from 1.364 sec. to 2.364 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80367 ( -0.312665 0.330495 )
Norm@50keV : 6.65175E-03 ( -0.00136086 0.00131589 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.96 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 57 degrees of freedom
# Null hypothesis probability = 2.735556e-01
Photon flux (15-150 keV) in 1 sec: 0.917905 ( -0.160907 0.161077 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.12281e-08 ( -1.24356e-08 1.27676e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.364 sec. to 2.364 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55678 ( -1.323 0.857803 )
Epeak [keV] : 81.0810 ( -80.9413 -80.9685 )
Norm@50keV : 9.09752E-03 ( -0.00582836 0.0384784 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.81 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 56 degrees of freedom
# Null hypothesis probability = 2.476956e-01
Photon flux (15-150 keV) in 1 sec: 0.909120 ( -0.165504 0.16511 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.98788e-08 ( -1.3553e-08 1.37731e-08 ) ergs/cm2
Band function
Time interval is from 1.364 sec. to 2.364 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.55631 ( -1.51249 1.26925 )
beta : -10.0000 ( 10 5.32907e-15 )
Epeak [keV] : 81.0357 ( -50.6759 -81.0375 )
Norm@50keV : 9.10027E-03 ( -0.00352835 0.038601 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.81 using 59 PHA bins.
# Reduced chi-squared = 1.142 for 55 degrees of freedom
# Null hypothesis probability = 2.191151e-01
Photon flux (15-150 keV) in 1 sec: 0.904985 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.98298e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.0565 (-2.71016 3.46117)
R^2/D10^2 : 0.212118 (-0.128092 0.334918)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.75 using 59 PHA bins.
# Reduced chi-squared = 1.276 for 57 degrees of freedom
# Null hypothesis probability = 7.802284e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.524e-09 2.275e-09
25- 50 2.065e-08 7.037e-09
50-150 1.810e-08 7.709e-09
15-150 4.527e-08 1.443e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 103.717 (-48.1799 -103.03)
Norm : 4.00353 (-0.823661 1.2604)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.97 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 57 degrees of freedom
# Null hypothesis probability = 2.733761e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.046e-08 2.883e-09
25- 50 1.822e-08 7.027e-09
50-150 3.014e-08 1.942e-08
15-150 5.883e-08 3.002e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.92929 (-2.00925 2.8103)
R1^2/D10^2 : 4.11978 (-3.33581 41.0289)
kT2 [keV] : 19.6918 (-5.91384 13.9738)
R2^2/D10^2 : 2.85506E-02 (-0.0245228 0.0461432)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.97 using 59 PHA bins.
# Reduced chi-squared = 1.127 for 55 degrees of freedom
# Null hypothesis probability = 2.415237e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.161e-08 6.615e-09
25- 50 1.655e-08 8.475e-09
50-150 3.058e-08 1.852e-08
15-150 5.874e-08 3.089e-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: 1.90761 ( -0.242214 0.25493 )
Norm@50keV : 2.78739E-03 ( -0.000460336 0.000449233 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.08 using 59 PHA bins.
# Reduced chi-squared = 1.282 for 57 degrees of freedom
# Null hypothesis probability = 7.419871e-02
Photon flux (15-150 keV) in 8.528 sec: 0.401318 ( -0.0545104 0.054538 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18559e-07 ( -3.47681e-08 3.56897e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18036 ( -1.33212 0.88755 )
Epeak [keV] : 46.3580 ( -46.2979 -46.3567 )
Norm@50keV : 7.39734E-03 ( -0.00739829 0.0384588 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.63 using 59 PHA bins.
# Reduced chi-squared = 1.279 for 56 degrees of freedom
# Null hypothesis probability = 7.784088e-02
Photon flux (15-150 keV) in 8.528 sec: 0.390173 ( -0.056536 0.056643 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01526e-07 ( -3.91316e-08 4.25684e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18079 ( -1.61102 0.722181 )
beta : -10.00000 ( 10 1.82822e-09 )
Epeak [keV] : 46.3528 ( -14.5498 -46.3528 )
Norm@50keV : 7.39238E-03 ( -0.000994079 0.0385422 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.63 using 59 PHA bins.
# Reduced chi-squared = 1.302 for 55 degrees of freedom
# Null hypothesis probability = 6.538476e-02
Photon flux (15-150 keV) in 8.528 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08042e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 6.39e-08
S(50-100 keV) = 6.81e-08
T90 vs. Hardness ratio plot
T90 = 7.82400000095367 sec.
Hardness ratio (energy fluence ratio) = 1.06573
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.989237
Count Ratio (50-100 keV) / (15-25 keV) = 0.56496
Mask shadow pattern
IMX = -7.423612127503768E-02, IMY = 3.973917185799377E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 3.072000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 3.072000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 3.072000
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:
-239.352000 0.648000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2689 -60.6673 13.0 47.4 -26.8 0.3721 0.9 3.0 Cen X-3
186.6668 -62.7726 1.0 39.4 -27.1 3.6507 11.8 0.3 GX 301-2
244.9837 -15.6362 0.4 30.8 99.2 10.5566 27.6 0.3 Sco X-1
255.9556 -37.8404 1.0 8.6 134.6 2.0042 11.4 1.5 4U 1700-377
256.3954 -36.4878 3.8 10.0 133.8 0.5636 3.0 4.3 GX 349+2
262.9489 -24.9325 4.2 22.8 139.0 0.6111 2.7 11.7 GX 1+4
264.6676 -44.5447 4.9 9.2 -161.8 0.4696 2.4 6.5 4U 1735-44
268.4258 -1.5451 9.2 46.7 135.2 -1.0778 -1.3 6.5 SW J1753.5-0127
270.2792 -25.1727 1.9 25.5 153.9 1.3769 6.1 5.6 GX 5-1
270.2210 -25.7541 3.7 25.0 154.5 0.6867 3.2 4.5 GRS 1758-258
273.9549 -13.9452 6.1 37.0 149.5 0.7124 1.9 6.2 GX 17+2
275.9517 -30.3839 2.3 24.4 170.9 1.0010 5.1 1.7 H1820-303
285.1063 -25.0305 6.7 33.8 175.5 -0.4013 -1.7 7.6 HT1900.1-2455
263.0010 -33.8058 1.3 14.8 151.3 1.6084 8.6 1.8 GX 354-0
195.9004 -51.5203 2.3 36.4 -7.7 1.2973 5.0 ------ UNKNOWN
149.2169 -71.5517 2.6 50.7 -44.4 5.0537 4.4 ------ UNKNOWN
324.0901 -46.9736 2.6 48.0 -129.0 4.2905 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.648000 9.176000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2759 -60.7079 3.0 47.4 -26.9 0.2296 3.8 5.2 Cen X-3
186.3725 -62.7093 4.2 39.6 -27.1 0.1242 2.7 8.6 GX 301-2
244.9166 -15.5025 6.9 30.9 99.1 -0.0875 -1.7 9.0 Sco X-1
255.9822 -37.9348 6.6 8.6 134.9 -0.0506 -1.8 5.4 4U 1700-377
256.3304 -36.4783 8.1 10.0 133.5 0.0411 1.4 6.1 GX 349+2
262.9469 -24.9334 0.0 22.8 139.0 -0.0498 -1.6 11.8 GX 1+4
264.6447 -44.3409 35.3 9.2 -163.1 0.0090 0.3 7.8 4U 1735-44
268.3294 -1.4107 5.7 46.8 135.0 -0.2925 -2.0 3.4 SW J1753.5-0127
270.0857 -25.0246 7.4 25.5 153.4 -0.0552 -1.6 11.3 GX 5-1
270.2505 -25.9327 0.0 24.8 154.8 0.0696 2.1 11.7 GRS 1758-258
273.9994 -14.0215 5.3 37.0 149.7 -0.1108 -2.2 1.0 GX 17+2
275.9777 -30.1822 5.0 24.5 170.6 -0.0732 -2.3 11.4 H1820-303
284.9320 -24.9581 14.3 33.8 175.2 -0.0302 -0.8 6.1 HT1900.1-2455
262.8868 -33.8446 7.1 14.7 151.0 -0.0447 -1.6 5.1 GX 354-0
287.5058 -4.3830 2.6 51.8 159.8 0.5571 4.4 ------ UNKNOWN
221.0013 -52.2546 2.4 21.0 -6.8 0.1353 4.8 ------ UNKNOWN
277.5618 -62.3058 1.0 22.0 -100.6 0.4240 12.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
88.948600 962.701900
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.6898 -60.6550 11.6 45.1 6.8 -0.9252 -1.0 11.2 Cen X-3
186.6463 -62.7722 0.4 38.4 12.8 18.3016 25.6 0.3 GX 301-2
255.9866 -37.8441 1.1 27.8 106.9 7.3086 10.2 0.0 4U 1700-377
256.4354 -36.4231 20.4 29.0 108.6 0.4336 0.6 0.0 GX 349+2
262.8650 -24.7929 7.6 38.8 123.8 1.9474 1.5 8.3 GX 1+4
264.7858 -44.2888 32.6 19.5 117.0 0.1781 0.4 9.8 4U 1735-44
270.2842 -25.0791 3.9 37.6 134.5 3.5945 3.0 0.0 GX 5-1
270.3023 -25.7432 25.0 36.9 134.4 0.5466 0.5 0.0 GRS 1758-258
274.0411 -14.1339 3.1 48.3 140.8 7.7577 3.7 6.2 GX 17+2
275.8493 -30.2342 6.7 32.1 142.6 1.4566 1.7 8.9 H1820-303
285.1135 -24.9908 10.0 37.7 156.6 -1.2769 -1.2 6.0 HT1900.1-2455
262.9389 -33.8488 1.9 30.0 120.5 4.2263 5.9 2.6 GX 354-0
318.4069 -11.0732 3.7 59.0 -166.2 13.2392 3.1 ------ UNKNOWN
336.7329 -27.2760 3.7 51.9 -138.7 11.4273 3.2 ------ UNKNOWN
Plot creation:
Sun May 31 10:15:13 EDT 2015