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
332.7164 36.5966 0.0145 33.6428 -65.5397 2.9195887 13.243 TRIG_00579571
Foreground time interval of the image:
-60.320 29.821 (delta_t = 90.141 [sec])
Background time interval of the image:
-188.179 -60.320 (delta_t = 127.859 [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)
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 -60.320 sec. to 51.288 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.34995 ( -0.152573 0.160449 )
Norm@50keV : 1.84352E-03 ( -0.000201947 0.000199364 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.86 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 57 degrees of freedom
# Null hypothesis probability = 4.073353e-01
Photon flux (15-150 keV) in 111.6 sec: 0.331369 ( -0.024461 0.024472 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98527e-06 ( -1.72727e-07 1.75978e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -60.320 sec. to 51.288 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82498 ( -0.694485 0.381324 )
Epeak [keV] : 12.7141 ( -12.026 16.282 )
Norm@50keV : 3.84058E-03 ( -0.00122818 0.00634704 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.51 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 56 degrees of freedom
# Null hypothesis probability = 4.558589e-01
Photon flux (15-150 keV) in 111.6 sec: 0.324073 ( -0.025638 0.025665 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87677e-06 ( -1.98615e-07 2.09853e-07 ) ergs/cm2
Band function
Time interval is from -60.320 sec. to 51.288 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.91681 ( -14.1419 -4.91681 )
beta : -2.50176 ( -0.243729 0.190212 )
Epeak [keV] : 20.6221 ( -3.02391 2.47134 )
Norm@50keV : 1272.03 ( -92.8653 4950.87 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.41 using 59 PHA bins.
# Reduced chi-squared = 0.9893 for 55 degrees of freedom
# Null hypothesis probability = 4.971652e-01
Photon flux (15-150 keV) in 111.6 sec: 0.324062 ( 6.67594 -0.025367 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87965e-06 ( -1.87886e-06 -2.04686e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.03502 (-0.744434 0.812202)
R^2/D10^2 : 0.340146 (-0.110511 0.168166)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 93.13 using 59 PHA bins.
# Reduced chi-squared = 1.634 for 57 degrees of freedom
# Null hypothesis probability = 1.784623e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.446e-07 5.781e-08
25- 50 7.841e-07 7.561e-08
50-150 2.088e-07 5.485e-08
15-150 1.438e-06 1.356e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 39.4973 (-7.11189 9.32668)
Norm : 2.13013 (-0.313243 0.382354)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.93 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.406638e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.435e-07 5.329e-08
25- 50 7.112e-07 5.619e-08
50-150 5.426e-07 1.248e-07
15-150 1.797e-06 1.869e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.49189 (-0.794774 0.929167)
R1^2/D10^2 : 2.75835 (-1.46562 3.66151)
kT2 [keV] : 14.4706 (-2.69379 4.22913)
R2^2/D10^2 : 2.21131E-02 (-0.0147813 0.0327518)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.94 using 59 PHA bins.
# Reduced chi-squared = 0.9807 for 55 degrees of freedom
# Null hypothesis probability = 5.153020e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.866e-07 2.321e-07
25- 50 6.551e-07 2.165e-07
50-150 5.912e-07 3.150e-07
15-150 1.833e-06 6.243e-07
Peak spectrum fit
Power-law model
Time interval is from -0.536 sec. to 0.464 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33374 ( -0.337271 0.336645 )
Norm@50keV : 1.07599E-02 ( -0.00195449 0.00194979 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.58 using 59 PHA bins.
# Reduced chi-squared = 0.9399 for 57 degrees of freedom
# Null hypothesis probability = 6.043442e-01
Photon flux (15-150 keV) in 1 sec: 1.29201 ( -0.240953 0.241583 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05479e-07 ( -2.13181e-08 2.15571e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.536 sec. to 0.464 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32700 ( -0.336773 0.341445 )
Epeak [keV] : 9999.35 ( -9999.36 -9999.36 )
Norm@50keV : 1.08045E-02 ( -0.00196996 0.0183143 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.58 using 59 PHA bins.
# Reduced chi-squared = 0.9568 for 56 degrees of freedom
# Null hypothesis probability = 5.669440e-01
Photon flux (15-150 keV) in 1 sec: 1.29514 ( -0.24442 0.2383 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05663e-07 ( -2.1491e-08 2.1121e-08 ) ergs/cm2
Band function
Time interval is from -0.536 sec. to 0.464 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07672 ( 1.07786 1.07786 )
beta : -1.33364 ( 1.33371 0.337634 )
Epeak [keV] : 42.9172 ( -42.0025 -42.0025 )
Norm@50keV : 2.00981E-02 ( -0.0113082 1.70779 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.58 using 59 PHA bins.
# Reduced chi-squared = 0.9741 for 55 degrees of freedom
# Null hypothesis probability = 5.292077e-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] : 18.8324 (-4.38008 6.00069)
R^2/D10^2 : 6.86548E-02 (-0.0409517 0.0974201)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.80 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 57 degrees of freedom
# Null hypothesis probability = 2.498992e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.801e-09 1.721e-09
25- 50 2.295e-08 7.255e-09
50-150 5.971e-08 2.390e-08
15-150 8.746e-08 2.600e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.33527 (-0.97486 0.974786)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.53 using 59 PHA bins.
# Reduced chi-squared = 0.9741 for 57 degrees of freedom
# Null hypothesis probability = 5.305408e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.329e-08 7.675e-09
25- 50 2.556e-08 1.465e-08
50-150 5.605e-08 3.156e-08
15-150 9.490e-08 5.475e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.11616 (-2.18141 4.31984)
R1^2/D10^2 : 4.23611 (-3.72368 52.4296)
kT2 [keV] : 27.3483 (-8.17697 31.6266)
R2^2/D10^2 : 1.78713E-02 (-0.0159713 0.0225819)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.31 using 59 PHA bins.
# Reduced chi-squared = 0.9693 for 55 degrees of freedom
# Null hypothesis probability = 5.392970e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.349e-08 7.580e-09
25- 50 2.089e-08 1.124e-08
50-150 7.165e-08 4.240e-08
15-150 1.060e-07 5.835e-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: 2.27514 ( -0.160976 0.169343 )
Norm@50keV : 1.98615E-03 ( -0.000228014 0.000224371 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.26 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 57 degrees of freedom
# Null hypothesis probability = 2.649836e-01
Photon flux (15-150 keV) in 90.14 sec: 0.342362 ( -0.0270269 0.0270352 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70316e-06 ( -1.60539e-07 1.6392e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95121 ( -0.666346 0.0437177 )
Epeak [keV] : 5.84427 ( -4.32018 25.6791 )
Norm@50keV : 3.11526E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.46 using 59 PHA bins.
# Reduced chi-squared = 1.115 for 56 degrees of freedom
# Null hypothesis probability = 2.574445e-01
Photon flux (15-150 keV) in 90.14 sec: 0.337965 ( -0.028152 0.028183 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6444e-06 ( -1.8933e-07 1.96983e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.97562 ( 1.97996 1.97996 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 3.16154 ( -1.75559 27.7214 )
Norm@50keV : 3.00983E-03 ( -0.000494995 0.00483105 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.46 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 55 degrees of freedom
# Null hypothesis probability = 2.282178e-01
Photon flux (15-150 keV) in 90.14 sec: 0.337963 ( 6.66204 -0.028053 ) 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) = 6.46e-07
S(50-100 keV) = 5.07e-07
T90 vs. Hardness ratio plot
T90 = 94.9719999432564 sec.
Hardness ratio (energy fluence ratio) = 0.78483
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.846863
Count Ratio (50-100 keV) / (15-25 keV) = 0.349205
Mask shadow pattern
IMX = 2.755486943051441E-01, IMY = 6.057471466918921E-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:
-188.179410 -60.320000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
326.0298 38.1837 7.5 39.1 -63.9 0.4791 1.5 10.6 Cyg X-2
31.2384 4.5902 2.1 29.2 129.2 0.9456 5.4 ------ UNKNOWN
315.2128 75.6318 2.2 56.7 -17.7 2.5639 5.2 ------ UNKNOWN
331.0991 0.4482 2.4 45.4 -121.2 2.8858 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-60.320000 29.820620
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
326.2695 38.2217 6.1 38.9 -63.8 -0.5678 -1.9 7.6 Cyg X-2
53.5213 72.5656 2.2 52.4 11.4 2.5211 5.2 ------ UNKNOWN
1.1026 -6.0704 2.3 33.0 -166.8 0.7100 4.9 370.2 UNKNOWN
332.7164 36.5966 0.9 33.6 -65.5 2.9197 13.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
83.220600 962.184700
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.6194 35.1797 1.6 26.8 -65.2 5.1722 7.2 1.9 Cyg X-1
308.0922 40.9579 0.8 19.7 -51.8 7.4261 14.7 0.9 Cyg X-3
326.2211 38.3822 2.6 5.5 -51.3 2.0257 4.4 4.3 Cyg X-2
357.4361 -12.8308 3.4 54.6 167.9 10.2813 3.4 ------ UNKNOWN
327.6241 8.0744 3.9 28.9 -151.6 1.5029 2.9 ------ UNKNOWN
297.4079 30.2092 0.9 30.0 -74.0 9.2029 13.0 ------ UNKNOWN
295.5564 12.6546 4.9 41.0 -98.1 5.8989 2.3 ------ UNKNOWN
Plot creation:
Wed Jun 10 01:45:46 EDT 2015