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
261.7123 -8.7486 0.0087 35.5458 89.8350 3.0603078 22.157 TRIG_00282073
Foreground time interval of the image:
-13.808 10.192 (delta_t = 24.000 [sec])
Background time interval of the image:
-239.808 -13.808 (delta_t = 226.000 [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 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)
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 -13.808 sec. to 10.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55836 ( -0.120405 0.121106 )
Norm@50keV : 8.07506E-03 ( -0.000563968 0.00056295 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.25 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 57 degrees of freedom
# Null hypothesis probability = 4.292928e-01
Photon flux (15-150 keV) in 24 sec: 1.02475 ( -0.0744562 0.0746815 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82232e-06 ( -1.35292e-07 1.3587e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -13.808 sec. to 10.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08453 ( -0.517737 0.463271 )
Epeak [keV] : 100.751 ( -28.7361 823.58 )
Norm@50keV : 1.37228E-02 ( -0.00543798 0.0103469 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.18 using 59 PHA bins.
# Reduced chi-squared = 0.9853 for 56 degrees of freedom
# Null hypothesis probability = 5.059459e-01
Photon flux (15-150 keV) in 24 sec: 0.999357 ( -0.078269 0.078433 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77096e-06 ( -1.45994e-07 1.45682e-07 ) ergs/cm2
Band function
Time interval is from -13.808 sec. to 10.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.08457 ( -0.414672 0.494422 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 100.741 ( -25.6944 593.268 )
Norm@50keV : 1.37208E-02 ( -0.00543743 0.0103475 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.18 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 55 degrees of freedom
# Null hypothesis probability = 4.678892e-01
Photon flux (15-150 keV) in 24 sec: 0.997980 ( 6.00202 -0.075599 ) 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] : 15.5449 (-1.33196 1.4752)
R^2/D10^2 : 0.100383 (-0.027696 0.037895)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.64 using 59 PHA bins.
# Reduced chi-squared = 1.713 for 57 degrees of freedom
# Null hypothesis probability = 6.505834e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.211e-07 1.640e-08
25- 50 4.969e-07 4.884e-08
50-150 8.298e-07 1.099e-07
15-150 1.448e-06 1.177e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.357 (-57.2239 -199.361)
Norm : 4.17391 (-0.28646 0.318594)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.58 using 59 PHA bins.
# Reduced chi-squared = 0.9750 for 57 degrees of freedom
# Null hypothesis probability = 5.285963e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.494e-07 2.152e-08
25- 50 4.798e-07 4.476e-08
50-150 1.052e-06 2.672e-07
15-150 1.782e-06 3.118e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.85488 (-1.52306 1.79528)
R1^2/D10^2 : 1.08932 (-0.585249 1.6153)
kT2 [keV] : 24.4507 (-4.08853 6.83253)
R2^2/D10^2 : 1.61419E-02 (-0.00971981 0.0128172)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.12 using 59 PHA bins.
# Reduced chi-squared = 0.9841 for 55 degrees of freedom
# Null hypothesis probability = 5.080962e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.337e-07 8.039e-08
25- 50 4.820e-07 1.371e-07
50-150 1.054e-06 3.616e-07
15-150 1.770e-06 5.734e-07
Peak spectrum fit
Power-law model
Time interval is from 0.192 sec. to 1.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03323 ( -0.245829 0.239526 )
Norm@50keV : 2.01874E-02 ( -0.00312756 0.00311285 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.72 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 57 degrees of freedom
# Null hypothesis probability = 1.373650e-01
Photon flux (15-150 keV) in 1 sec: 2.32872 ( -0.368056 0.370681 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.1578e-07 ( -3.42082e-08 3.44e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.192 sec. to 1.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.891414 ( -1.76722 1.27445 )
Epeak [keV] : 88.6410 ( -18.9798 59.642 )
Norm@50keV : 0.133052 ( -0.133054 0.582348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.16 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 56 degrees of freedom
# Null hypothesis probability = 2.960972e-01
Photon flux (15-150 keV) in 1 sec: 2.16886 ( -0.37126 0.37912 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0255e-07 ( -3.7514e-08 3.7196e-08 ) ergs/cm2
Band function
Time interval is from 0.192 sec. to 1.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.17021 ( -1.0491 1.52995 )
beta : -1.78465 ( 9.37166 19.3717 )
Epeak [keV] : 55.8018 ( -18.0571 50.7762 )
Norm@50keV : 7.32622 ( -7.28524 4.00577 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.26 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 55 degrees of freedom
# Null hypothesis probability = 2.913347e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02479e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.1321 (-3.22371 4.07451)
R^2/D10^2 : 0.100096 (-0.043633 0.071273)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.62 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 57 degrees of freedom
# Null hypothesis probability = 3.142946e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.422e-09 2.401e-09
25- 50 4.346e-08 1.051e-08
50-150 1.447e-07 3.919e-08
15-150 1.966e-07 4.130e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 9.71213 (-1.53985 1.53957)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.52 using 59 PHA bins.
# Reduced chi-squared = 1.395 for 57 degrees of freedom
# Null hypothesis probability = 2.601747e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.418e-08 1.398e-08
25- 50 4.652e-08 2.646e-08
50-150 1.020e-07 5.675e-08
15-150 1.727e-07 9.730e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.119918 (0.822496 -0.119918)
R1^2/D10^2 : 3.79579E+15 (-3.79579e+15 -3.79579e+15)
kT2 [keV] : 21.1320 (-3.22357 4.07464)
R2^2/D10^2 : 0.100099 (-0.043635 0.0712713)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.62 using 59 PHA bins.
# Reduced chi-squared = 1.120 for 55 degrees of freedom
# Null hypothesis probability = 2.512337e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
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: 1.55836 ( -0.120405 0.121106 )
Norm@50keV : 8.07506E-03 ( -0.000563968 0.00056295 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.25 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 57 degrees of freedom
# Null hypothesis probability = 4.292928e-01
Photon flux (15-150 keV) in 24 sec: 1.02475 ( -0.0744562 0.0746815 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82232e-06 ( -1.35292e-07 1.3587e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08453 ( -0.517737 0.463271 )
Epeak [keV] : 100.751 ( -28.7361 823.58 )
Norm@50keV : 1.37228E-02 ( -0.00543798 0.0103469 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.18 using 59 PHA bins.
# Reduced chi-squared = 0.9853 for 56 degrees of freedom
# Null hypothesis probability = 5.059459e-01
Photon flux (15-150 keV) in 24 sec: 0.999357 ( -0.078269 0.078433 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77096e-06 ( -1.45994e-07 1.45682e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.08457 ( -0.414672 0.494422 )
beta : -10.0000 ( 10 1.77636e-14 )
Epeak [keV] : 100.741 ( -25.6944 593.246 )
Norm@50keV : 1.37208E-02 ( -0.00543743 0.0103475 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.18 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 55 degrees of freedom
# Null hypothesis probability = 4.678892e-01
Photon flux (15-150 keV) in 24 sec: 0.997980 ( 6.00202 -0.075599 ) 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) = 4.63e-07
S(50-100 keV) = 6.29e-07
T90 vs. Hardness ratio plot
T90 = 18 sec.
Hardness ratio (energy fluence ratio) = 1.35853
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.38121
Count Ratio (50-100 keV) / (15-25 keV) = 1.09901
Mask shadow pattern
IMX = 2.057631575734852E-03, IMY = -7.144969436025950E-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:
-239.808000 -13.808000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9849 -15.6383 0.5 41.0 62.4 22.6915 22.5 0.3 Sco X-1
256.1359 -37.9461 4.2 22.0 31.7 0.5022 2.7 9.4 4U 1700-377
256.3283 -36.4039 2.3 22.2 35.8 0.9446 4.9 5.3 GX 349+2
262.8997 -24.7181 4.0 22.4 70.4 0.7155 2.9 6.2 GX 1+4
264.7999 -44.5758 5.1 16.0 9.7 0.3939 2.2 7.9 4U 1735-44
268.2823 -1.5354 5.8 39.2 104.7 -1.7238 -2.0 7.1 SW J1753.5-0127
270.4097 -25.1838 26.2 17.3 84.0 -0.0883 -0.4 9.3 GX 5-1
270.2740 -25.9034 4.1 16.8 82.1 0.5810 2.9 9.7 GRS 1758-258
274.0168 -13.9153 4.9 25.7 107.1 0.6721 2.3 7.3 GX 17+2
275.8995 -30.3488 5.7 10.2 85.9 0.4013 2.0 1.7 H1820-303
284.8027 -24.9046 0.0 13.1 132.8 -0.2457 -1.2 12.7 HT1900.1-2455
262.8799 -33.7645 5.1 17.7 47.6 0.4516 2.3 6.9 GX 354-0
314.1268 -8.9447 2.2 39.6 -179.0 1.4724 5.3 ------ UNKNOWN
263.8328 -50.6086 2.5 19.2 -7.4 0.8004 4.7 ------ UNKNOWN
313.4719 -30.2988 2.6 25.3 -148.4 0.8049 4.4 ------ UNKNOWN
311.0500 -84.3920 4.7 47.1 -53.1 2.6936 2.5 ------ UNKNOWN
340.6186 -53.8157 3.2 41.1 -98.1 4.7440 3.6 ------ UNKNOWN
341.9257 -42.5534 3.2 43.4 -114.6 3.3104 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-13.808000 10.192000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9690 -15.8071 6.9 40.9 62.2 -0.3425 -1.7 10.0 Sco X-1
256.0837 -37.9652 5.8 22.1 31.6 -0.1064 -2.0 8.6 4U 1700-377
256.5367 -36.5425 14.0 22.0 35.5 -0.0436 -0.8 8.7 GX 349+2
262.9534 -24.7802 18.2 22.3 70.4 0.0411 0.6 3.7 GX 1+4
264.7381 -44.4937 5.3 16.0 10.1 0.1035 2.2 2.6 4U 1735-44
268.2377 -1.3812 8.0 39.4 104.7 -0.3079 -1.4 8.9 SW J1753.5-0127
270.4431 -25.0384 4.2 17.4 84.3 -0.1590 -2.8 9.0 GX 5-1
270.3625 -25.8869 27.7 16.8 82.3 0.0236 0.4 9.2 GRS 1758-258
274.0077 -14.0363 27.3 25.6 107.0 0.0321 0.4 0.1 GX 17+2
275.8730 -30.4369 20.4 10.2 85.5 -0.0273 -0.6 5.0 H1820-303
284.9709 -25.0771 7.4 12.9 133.6 -0.0808 -1.5 10.0 HT1900.1-2455
262.8834 -33.7157 7.5 17.7 47.7 -0.0840 -1.5 8.9 GX 354-0
261.7123 -8.7486 0.5 35.5 89.8 3.0611 22.1 ------ UNKNOWN
302.6103 -23.4566 2.4 21.4 -177.0 0.2364 4.9 ------ UNKNOWN
252.1754 -67.7938 2.6 34.7 -29.0 0.2696 4.5 ------ UNKNOWN
196.9465 -69.3184 2.3 53.9 -23.8 0.7681 5.0 ------ UNKNOWN
336.9825 -66.8645 2.4 41.2 -78.0 0.8714 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
217.292590 640.492600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6368 35.3110 17.6 38.7 170.3 0.2560 0.7 9.0 Her X-1
268.2638 -1.5615 6.3 40.6 107.2 1.7816 1.8 9.0 SW J1753.5-0127
288.7972 10.9321 0.7 18.0 89.4 4.8588 16.9 0.8 GRS 1915+105
299.5794 35.1960 0.3 8.9 -120.5 7.9600 35.2 0.6 Cyg X-1
308.1004 40.9411 0.9 16.5 -99.0 3.1438 12.7 0.8 Cyg X-3
326.1749 38.3211 20.3 25.9 -68.7 0.1943 0.6 0.2 Cyg X-2
275.6349 -1.7219 3.0 35.9 98.1 2.2187 3.8 ------ UNKNOWN
231.0442 40.8487 2.7 56.9 179.1 6.8609 4.3 ------ UNKNOWN
285.9775 73.7671 2.7 48.0 -129.0 5.3816 4.3 ------ UNKNOWN
Plot creation:
Sun May 31 09:56:51 EDT 2015