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
326.7870 -72.8909 0.0292 41.6116 -43.2779 0.9432681 6.571 TRIG_00811074
Foreground time interval of the image:
1.656 14.656 (delta_t = 13.000 [sec])
Background time interval of the image:
-239.344 1.656 (delta_t = 241.000 [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 16.384000
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 16.384000
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 16.384000
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 1.656 sec. to 14.656 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70922 ( -0.356784 0.38459 )
Norm@50keV : 4.74108E-03 ( -0.00112967 0.00109314 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.61 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 57 degrees of freedom
# Null hypothesis probability = 3.807462e-01
Photon flux (15-150 keV) in 13 sec: 0.631737 ( -0.13163 0.131716 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.7034e-07 ( -1.38499e-07 1.42633e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.656 sec. to 14.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.904527 ( -1.94303 1.31673 )
Epeak [keV] : 63.6963 ( -63.6999 -63.6999 )
Norm@50keV : 1.27466E-02 ( -0.0127452 0.120377 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.71 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 56 degrees of freedom
# Null hypothesis probability = 3.765028e-01
Photon flux (15-150 keV) in 13 sec: 0.613728 ( -0.068144 0.135525 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.37568e-07 ( -1.41934e-07 1.53328e-07 ) ergs/cm2
Band function
Time interval is from 1.656 sec. to 14.656 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.907478 ( -1.15051 6.18784 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 63.3699 ( -29.5114 -63.4347 )
Norm@50keV : 1.27626E-02 ( -0.0127476 0.120251 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.71 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 55 degrees of freedom
# Null hypothesis probability = 3.411921e-01
Photon flux (15-150 keV) in 13 sec: 0.626182 ( -0.151687 0.125899 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.69198e-07 ( -1.78642e-07 1.26808e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.0945 (-2.85945 3.66974)
R^2/D10^2 : 0.115214 (-0.0685122 0.164372)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.47 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 57 degrees of freedom
# Null hypothesis probability = 2.882175e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.446e-08 2.245e-08
25- 50 1.890e-07 6.648e-08
50-150 2.058e-07 9.981e-08
15-150 4.493e-07 1.621e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 139.366 (-72.3419 -129.022)
Norm : 2.54933 (-0.598284 0.916998)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.04 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 57 degrees of freedom
# Null hypothesis probability = 4.006908e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.561e-08 4.966e-08
25- 50 1.569e-07 8.749e-08
50-150 3.002e-07 1.921e-07
15-150 5.428e-07 3.235e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.33835 (-2.92592 6.14688)
R1^2/D10^2 : 3.62375 (-3.45028 4721.27)
kT2 [keV] : 17.1022 (-4.97868 18.0522)
R2^2/D10^2 : 3.75596E-02 (-0.0357235 0.105281)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.09 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 55 degrees of freedom
# Null hypothesis probability = 3.620444e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.168e-08 5.123e-08
25- 50 1.574e-07 8.391e-08
50-150 2.706e-07 1.663e-07
15-150 5.198e-07 2.818e-07
Peak spectrum fit
Power-law model
Time interval is from 2.656 sec. to 3.656 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54194 ( -0.558522 0.608702 )
Norm@50keV : 1.16937E-02 ( -0.00408941 0.00392862 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.51 using 59 PHA bins.
# Reduced chi-squared = 1.307 for 57 degrees of freedom
# Null hypothesis probability = 5.960393e-02
Photon flux (15-150 keV) in 1 sec: 1.47697 ( -0.479099 0.48024 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1023e-07 ( -4.03134e-08 4.16043e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.656 sec. to 3.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.510220 ( -0.49829 1.67794 )
Epeak [keV] : 73.5370 ( -57.2186 -73.31 )
Norm@50keV : 3.80555E-02 ( -0.0388716 804.195 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.12 using 59 PHA bins.
# Reduced chi-squared = 1.324 for 56 degrees of freedom
# Null hypothesis probability = 5.287851e-02
Photon flux (15-150 keV) in 1 sec: 1.41704 ( -0.637511 0.50747 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04179e-07 ( -3.94767e-08 4.44317e-08 ) ergs/cm2
Band function
Time interval is from 2.656 sec. to 3.656 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.506847 ( 0.868887 2.8555 )
beta : -9.99944 ( 9.99876 19.9988 )
Epeak [keV] : 73.4613 ( -52.4606 -73.4617 )
Norm@50keV : 3.82278E-02 ( -0.0244469 1.0463 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.12 using 59 PHA bins.
# Reduced chi-squared = 1.348 for 55 degrees of freedom
# Null hypothesis probability = 4.378514e-02
Photon flux (15-150 keV) in 1 sec: 1.37359 ( -0.40864 0.55407 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.10282e-08 ( 1.88884e-08 1.00806e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.5806 (-4.19229 6.304)
R^2/D10^2 : 0.154759 (-0.154758 0.304907)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.59 using 59 PHA bins.
# Reduced chi-squared = 1.309 for 57 degrees of freedom
# Null hypothesis probability = 5.885842e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.812e-09 4.981e-09
25- 50 3.212e-08 1.907e-08
50-150 5.393e-08 3.693e-08
15-150 9.386e-08 6.175e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.027 (-143.015 -199.06)
Norm : 6.05202 (-1.93656 2.62336)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.32 using 59 PHA bins.
# Reduced chi-squared = 1.304 for 57 degrees of freedom
# Null hypothesis probability = 6.138487e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.507e-08 9.385e-09
25- 50 2.899e-08 1.792e-08
50-150 6.355e-08 4.001e-08
15-150 1.076e-07 6.610e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.76587 (-2.75948 14.4925)
R1^2/D10^2 : 86.3718 (-87.0856 -87.0856)
kT2 [keV] : 17.5029 (-5.08186 10.0816)
R2^2/D10^2 : 9.47516E-02 (-0.0948793 0.12892)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.17 using 59 PHA bins.
# Reduced chi-squared = 1.312 for 55 degrees of freedom
# Null hypothesis probability = 6.002392e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.543e-08 8.555e-09
25- 50 2.758e-08 1.605e-08
50-150 5.857e-08 4.020e-08
15-150 1.016e-07 5.855e-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: 1.70922 ( -0.356784 0.38459 )
Norm@50keV : 4.74108E-03 ( -0.00112967 0.00109314 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.61 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 57 degrees of freedom
# Null hypothesis probability = 3.807462e-01
Photon flux (15-150 keV) in 13 sec: 0.631709 ( -0.131622 0.131708 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.70255e-07 ( -1.38386e-07 1.42834e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.904585 ( -1.94303 1.31673 )
Epeak [keV] : 63.6994 ( -63.7 -63.7 )
Norm@50keV : 1.27455E-02 ( -0.0127452 0.120375 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.71 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 56 degrees of freedom
# Null hypothesis probability = 3.765028e-01
Photon flux (15-150 keV) in 13 sec: 0.613647 ( -0.135539 0.135477 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.37741e-07 ( -1.41995e-07 1.53431e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.907478 ( -1.15051 6.18783 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 63.3699 ( -31.2293 -63.4347 )
Norm@50keV : 1.27626E-02 ( -0.0127476 0.120251 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.71 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 55 degrees of freedom
# Null hypothesis probability = 3.411921e-01
Photon flux (15-150 keV) in 13 sec: 0.626182 ( -0.151687 0.125899 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.69198e-07 ( -1.78642e-07 1.26808e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.55e-07
S(50-100 keV) = 1.90e-07
T90 vs. Hardness ratio plot
T90 = 11 sec.
Hardness ratio (energy fluence ratio) = 1.22581
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.39521
Count Ratio (50-100 keV) / (15-25 keV) = 0.899495
Mask shadow pattern
IMX = 6.466458539785949E-01, IMY = 6.088966623792679E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
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:
-239.344000 1.656000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.1712 -60.8243 0.0 27.8 39.0 0.3576 0.3 12.8 Cen X-3
187.0933 -62.7835 0.0 19.7 35.5 -1.3206 -1.3 12.0 GX 301-2
245.0060 -15.6526 1.6 43.1 -166.4 12.5335 7.3 1.7 Sco X-1
256.1696 -37.8446 13.8 28.1 -132.5 1.1752 0.8 8.7 4U 1700-377
256.2277 -36.2935 5.7 29.3 -134.5 2.8968 2.0 12.7 GX 349+2
263.0871 -24.7851 10.8 42.1 -137.9 -2.3099 -1.1 4.9 GX 1+4
264.8762 -44.5643 42.9 28.3 -112.6 0.4573 0.3 8.9 4U 1735-44
270.3242 -25.0903 10.6 45.6 -129.8 -3.6492 -1.1 2.3 GX 5-1
270.1657 -25.7596 66.6 44.9 -129.4 0.5409 0.2 7.5 GRS 1758-258
275.8251 -30.5058 0.0 44.3 -119.6 4.8974 1.0 9.8 H1820-303
262.9817 -33.8411 122.3 34.7 -129.4 -0.1561 -0.1 0.5 GX 354-0
158.2408 -51.6423 3.8 37.5 50.0 5.5444 3.0 ------ UNKNOWN
64.9943 -76.4510 3.0 47.4 -11.0 6.5318 3.8 ------ UNKNOWN
299.5028 -61.2421 3.4 38.1 -66.9 9.2072 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
1.656000 14.656000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4578 -60.4213 0.0 27.8 39.9 -0.0147 -0.2 12.8 Cen X-3
186.6438 -62.7304 4.6 19.9 35.7 0.1855 2.5 2.4 GX 301-2
244.9270 -15.6056 8.5 43.1 -166.5 0.1690 1.4 3.7 Sco X-1
255.8788 -37.9086 4.4 27.9 -132.8 0.2359 2.6 6.4 4U 1700-377
256.2278 -36.2937 9.9 29.3 -134.5 0.1075 1.2 12.7 GX 349+2
263.1358 -24.8774 3.6 42.1 -137.7 -0.5009 -3.2 10.5 GX 1+4
264.5044 -44.3618 51.4 28.2 -113.3 0.0246 0.2 11.5 4U 1735-44
270.3630 -25.0180 7.3 45.6 -129.8 -0.3912 -1.6 5.6 GX 5-1
270.3493 -25.8654 7.8 45.0 -129.1 0.3507 1.5 7.8 GRS 1758-258
276.1590 -30.4476 0.0 44.5 -119.4 -0.3802 -1.1 13.0 H1820-303
263.1126 -33.6894 0.0 34.9 -129.4 0.0940 0.8 10.7 GX 354-0
50.7716 -65.2633 2.3 59.2 -14.1 2.1841 5.0 ------ UNKNOWN
326.7872 -72.8909 1.8 41.6 -43.3 0.9430 6.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
701.956600 954.556600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9799 -15.6221 0.6 37.2 60.0 12.9786 18.4 1.1 Sco X-1
254.4368 35.3377 15.9 46.0 141.3 0.8220 0.7 1.1 Her X-1
256.0371 -37.9478 73.8 41.2 21.5 0.0814 0.2 6.7 4U 1700-377
256.5514 -36.5709 6.4 39.9 22.3 0.9303 1.8 10.5 GX 349+2
262.8720 -24.6614 7.3 27.3 28.9 -0.5467 -1.6 9.0 GX 1+4
264.8622 -44.5736 6.4 43.4 7.9 0.8828 1.8 9.0 4U 1735-44
268.4929 -1.6209 0.0 12.4 89.9 0.3957 1.3 12.6 SW J1753.5-0127
270.2866 -25.0381 3.2 23.8 15.5 1.0773 3.6 2.5 GX 5-1
270.3113 -25.7060 3.8 24.4 14.7 0.9241 3.1 2.3 GRS 1758-258
274.0417 -14.0330 1.8 12.4 23.2 2.0439 6.5 2.1 GX 17+2
275.9767 -30.2949 4.6 27.2 0.5 0.7087 2.5 5.1 H1820-303
285.0264 -24.9413 524.5 21.8 -19.1 0.0064 0.0 1.4 HT1900.1-2455
288.7966 10.9562 0.7 16.5 -159.7 4.8943 16.3 0.6 GRS 1915+105
299.5683 35.1982 0.5 42.5 -165.6 11.6835 21.2 1.1 Cyg X-1
308.1570 40.9596 4.3 51.0 -162.0 2.1977 2.7 2.2 Cyg X-3
262.8704 -33.6948 230.0 34.5 18.2 0.0208 0.0 10.3 GX 354-0
249.8304 -49.8198 2.6 53.2 15.9 4.9463 4.4 ------ UNKNOWN
283.4350 24.8193 2.1 28.5 176.5 1.7558 5.6 ------ UNKNOWN
314.8915 -19.5266 3.9 37.0 -70.2 2.2907 3.0 ------ UNKNOWN
316.1467 -29.0426 3.3 42.2 -57.5 3.2150 3.5 ------ UNKNOWN
321.9344 -2.7137 3.6 41.1 -98.5 5.1190 3.2 ------ UNKNOWN
Plot creation:
Sat Apr 7 22:39:40 EDT 2018