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
105.1675 -73.1361 0.0035 24.4015 104.8759 21.0133874 55.538 TRIG_00586569
Foreground time interval of the image:
-5.700 82.040 (delta_t = 87.740 [sec])
Background time interval of the image:
-67.275 -5.700 (delta_t = 61.575 [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)
The mask-weighted light curves based on cleaned DPHs
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 -5.700 sec. to 82.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79738 ( -0.0393692 0.0394351 )
Norm@50keV : 1.48505E-02 ( -0.000294644 0.0002946 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.97 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 57 degrees of freedom
# Null hypothesis probability = 2.188500e-01
Photon flux (15-150 keV) in 87.74 sec: 2.04429 ( -0.0489042 0.0491518 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19964e-05 ( -2.40015e-07 2.40087e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.700 sec. to 82.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61632 ( -0.162889 0.157111 )
Epeak [keV] : 113.714 ( -29.9013 317.506 )
Norm@50keV : 1.80114E-02 ( -0.00271027 0.00332512 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.10 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 56 degrees of freedom
# Null hypothesis probability = 2.977420e-01
Photon flux (15-150 keV) in 87.74 sec: 2.00869 ( -0.05677 0.05717 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18327e-05 ( -2.80768e-07 2.7954e-07 ) ergs/cm2
Band function
Time interval is from -5.700 sec. to 82.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.760586 ( -0.623939 3.81656 )
beta : -1.87506 ( -0.0791856 0.0657468 )
Epeak [keV] : 43.0348 ( -17.7115 30.1977 )
Norm@50keV : 6.16213E-02 ( -0.0388473 11.4061 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.73 using 59 PHA bins.
# Reduced chi-squared = 0.9951 for 55 degrees of freedom
# Null hypothesis probability = 4.849079e-01
Photon flux (15-150 keV) in 87.74 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1715e-05 ( -1.17144e-05 -2.77346e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.4795 ( )
R^2/D10^2 : 0.227775 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 601.61 using 59 PHA bins.
# Reduced chi-squared = 10.555 for 57 degrees of freedom
# Null hypothesis probability = 6.271901e-92
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.818e-07 3.703e-08
25- 50 3.389e-06 1.005e-07
50-150 4.758e-06 1.768e-07
15-150 9.028e-06 1.974e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 119.976 ( )
Norm : 8.45140 (-0.320667 0.238209)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.23 using 59 PHA bins.
# Reduced chi-squared = 1.250 for 57 degrees of freedom
# Null hypothesis probability = 9.738264e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.871e-06 9.169e-08
25- 50 3.384e-06 1.290e-07
50-150 6.228e-06 1.280e-06
15-150 1.148e-05 1.347e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.77384 (-0.539722 0.559988)
R1^2/D10^2 : 1.63879 (-0.346123 0.472456)
kT2 [keV] : 27.9589 (-2.47359 3.16035)
R2^2/D10^2 : 1.50147E-02 (-0.0048447 0.00631617)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.80 using 59 PHA bins.
# Reduced chi-squared = 1.324 for 55 degrees of freedom
# Null hypothesis probability = 5.428641e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.705e-06 1.070e-07
25- 50 3.564e-06 1.220e-07
50-150 6.300e-06 3.659e-07
15-150 1.157e-05 5.221e-07
Peak spectrum fit
Power-law model
Time interval is from 0.556 sec. to 1.556 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71209 ( -0.0524164 0.0526716 )
Norm@50keV : 0.176559 ( -0.0051899 0.00518523 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.17 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 57 degrees of freedom
# Null hypothesis probability = 3.287060e-01
Photon flux (15-150 keV) in 1 sec: 23.5490 ( -0.750213 0.752176 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63323e-06 ( -4.94555e-08 4.95075e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.556 sec. to 1.556 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45680 ( -0.21342 0.203606 )
Epeak [keV] : 111.325 ( -28.638 201.123 )
Norm@50keV : 0.234637 ( -0.0464723 0.0613897 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.53 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 56 degrees of freedom
# Null hypothesis probability = 4.549127e-01
Photon flux (15-150 keV) in 1 sec: 23.1667 ( -0.8017 0.8047 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60862e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.556 sec. to 1.556 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.231612 ( -1.14856 3.28821 )
beta : -1.83276 ( -0.0949074 0.0830454 )
Epeak [keV] : 41.0295 ( -9.40175 11.1854 )
Norm@50keV : 1.45134 ( -2.76147 420.152 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.20 using 59 PHA bins.
# Reduced chi-squared = 0.8582 for 55 degrees of freedom
# Null hypothesis probability = 7.634719e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59073e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.0303 ( )
R^2/D10^2 : 3.14373 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 337.35 using 59 PHA bins.
# Reduced chi-squared = 5.9184 for 57 degrees of freedom
# Null hypothesis probability = 2.028766e-41
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.307e-07 8.200e-09
25- 50 4.871e-07 1.920e-08
50-150 6.321e-07 3.805e-08
15-150 1.250e-06 3.950e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 143.567 ( )
Norm : 96.3254 (-3.48289 4.28578)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.92 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.412885e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.462e-07 1.450e-08
25- 50 4.545e-07 2.320e-08
50-150 8.869e-07 2.034e-07
15-150 1.588e-06 2.150e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.12816 (-0.681605 0.703886)
R1^2/D10^2 : 16.7883 (-3.98907 5.68874)
kT2 [keV] : 30.7208 (-3.7974 5.36797)
R2^2/D10^2 : 0.132142 (-0.056437 0.08268)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.92 using 59 PHA bins.
# Reduced chi-squared = 0.9258 for 55 degrees of freedom
# Null hypothesis probability = 6.312147e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.221e-07 1.960e-08
25- 50 4.847e-07 2.395e-08
50-150 8.916e-07 1.007e-07
15-150 1.598e-06 1.320e-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: 1.79738 ( -0.0393692 0.0394351 )
Norm@50keV : 1.48505E-02 ( -0.000294644 0.0002946 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.97 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 57 degrees of freedom
# Null hypothesis probability = 2.188500e-01
Photon flux (15-150 keV) in 87.74 sec: 2.04429 ( -0.0489042 0.0491518 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19964e-05 ( -2.40015e-07 2.40087e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61632 ( -0.162889 0.157111 )
Epeak [keV] : 113.714 ( -29.9013 317.506 )
Norm@50keV : 1.80114E-02 ( -0.00271027 0.00332512 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.10 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 56 degrees of freedom
# Null hypothesis probability = 2.977420e-01
Photon flux (15-150 keV) in 87.74 sec: 2.00869 ( -0.05677 0.05717 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18327e-05 ( -2.80768e-07 2.7954e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.760586 ( -0.623939 3.81656 )
beta : -1.87506 ( -0.0791856 0.0657468 )
Epeak [keV] : 43.0348 ( -17.7115 30.1977 )
Norm@50keV : 6.16213E-02 ( -0.0388473 11.4061 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.73 using 59 PHA bins.
# Reduced chi-squared = 0.9951 for 55 degrees of freedom
# Null hypothesis probability = 4.849079e-01
Photon flux (15-150 keV) in 87.74 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1715e-05 ( -1.17144e-05 -2.77346e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 3.37e-06
S(50-100 keV) = 3.88e-06
T90 vs. Hardness ratio plot
T90 = 59.9319999217987 sec.
Hardness ratio (energy fluence ratio) = 1.15134
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.23436
Count Ratio (50-100 keV) / (15-25 keV) = 0.747834
Mask shadow pattern
IMX = -1.164643576975149E-01, IMY = -4.384465034381541E-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:
-67.275410 -5.700000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2920 -60.5724 43.1 46.0 133.4 -0.1200 -0.3 3.1 Cen X-3
187.0775 -62.7620 4.7 44.8 144.9 0.6957 2.4 11.6 GX 301-2
264.6981 -44.3630 4.1 53.5 -153.6 0.9115 2.8 5.6 4U 1735-44
101.2932 -53.6004 3.0 39.1 79.4 1.5036 3.9 ------ UNKNOWN
44.1437 -64.2920 2.5 13.5 37.9 0.4294 4.6 ------ UNKNOWN
34.8569 -34.1087 2.7 39.8 -3.3 0.5682 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-5.700000 82.040000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
169.8898 -60.5712 2.8 46.0 133.2 -5.9212 -4.1 12.9 Cen X-3
187.1001 -62.7527 4.0 44.8 144.9 -2.5718 -2.9 12.2 GX 301-2
264.7387 -44.4239 7.0 53.5 -153.6 -1.4305 -1.7 1.6 4U 1735-44
65.4830 -40.2176 2.2 40.6 35.9 2.9792 5.3 ------ UNKNOWN
105.1675 -73.1361 0.2 24.4 104.9 21.0124 55.5 ------ UNKNOWN
47.1374 -25.5373 2.8 50.2 9.2 2.7854 4.1 ------ UNKNOWN
341.0924 -51.4534 3.2 25.4 -83.0 1.0097 3.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
924.924600 962.620100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5115 35.2281 3.3 48.8 -39.5 0.7498 3.5 4.2 Cyg X-1
308.3125 40.9237 8.7 40.2 -43.2 0.1663 1.3 9.3 Cyg X-3
326.2731 38.3697 17.4 34.9 -64.6 0.0824 0.7 5.6 Cyg X-2
281.3119 32.6784 1.7 58.9 -25.2 2.9379 6.6 ------ UNKNOWN
Plot creation:
Mon Jun 8 22:38:16 EDT 2015