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
93.5056 64.0739 0.0128 37.0464 -87.5126 2.5372834 15.054 TRIG_00356912
Foreground time interval of the image:
-5.408 27.760 (delta_t = 33.168 [sec])
Background time interval of the image:
-239.776 -5.408 (delta_t = 234.368 [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 -5.408 sec. to 27.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44926 ( -0.170551 0.171826 )
Norm@50keV : 4.63401E-03 ( -0.00047377 0.000472473 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.52 using 59 PHA bins.
# Reduced chi-squared = 0.7985 for 57 degrees of freedom
# Null hypothesis probability = 8.630173e-01
Photon flux (15-150 keV) in 33.17 sec: 0.570974 ( -0.0590903 0.0592032 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4711e-06 ( -1.63776e-07 1.65009e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.408 sec. to 27.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.728859 ( -0.846621 0.711017 )
Epeak [keV] : 92.1776 ( -25.4556 890.846 )
Norm@50keV : 1.03869E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.54 using 59 PHA bins.
# Reduced chi-squared = 0.7596 for 56 degrees of freedom
# Null hypothesis probability = 9.077192e-01
Photon flux (15-150 keV) in 33.17 sec: 0.553459 ( -0.062044 0.061738 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41236e-06 ( -1.74713e-07 1.76037e-07 ) ergs/cm2
Band function
Time interval is from -5.408 sec. to 27.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.761186 ( -0.427386 0.685159 )
beta : -9.36346 ( 9.37131 19.3713 )
Epeak [keV] : 94.7725 ( -23.6032 171.286 )
Norm@50keV : 9.97521E-03 ( -0.00400847 0.00550117 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.55 using 59 PHA bins.
# Reduced chi-squared = 0.7736 for 55 degrees of freedom
# Null hypothesis probability = 8.899531e-01
Photon flux (15-150 keV) in 33.17 sec: 0.554438 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41602e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.4675 (-1.83902 2.10287)
R^2/D10^2 : 4.85050E-02 (-0.0166574 0.0247872)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.82 using 59 PHA bins.
# Reduced chi-squared = 0.9793 for 57 degrees of freedom
# Null hypothesis probability = 5.194910e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.960e-08 1.896e-08
25- 50 3.863e-07 5.524e-08
50-150 7.400e-07 1.360e-07
15-150 1.216e-06 1.733e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 2.36088 (-0.23719 0.237176)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.81 using 59 PHA bins.
# Reduced chi-squared = 0.7861 for 57 degrees of freedom
# Null hypothesis probability = 8.793808e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.950e-07 5.785e-08
25- 50 3.752e-07 1.977e-07
50-150 8.227e-07 4.440e-07
15-150 1.393e-06 7.496e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.79691 (-2.18436 3.31484)
R1^2/D10^2 : 1.76724 (-1.48993 34.2946)
kT2 [keV] : 20.2121 (-3.25788 5.86114)
R2^2/D10^2 : 2.13624E-02 (-0.0135 0.0142535)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.23 using 59 PHA bins.
# Reduced chi-squared = 0.7496 for 55 degrees of freedom
# Null hypothesis probability = 9.157715e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.760e-07 8.460e-08
25- 50 3.496e-07 1.017e-07
50-150 8.477e-07 2.680e-07
15-150 1.373e-06 4.027e-07
Peak spectrum fit
Power-law model
Time interval is from 0.980 sec. to 1.980 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30869 ( -0.254805 0.252664 )
Norm@50keV : 1.85740E-02 ( -0.00305675 0.00305667 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.65 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 57 degrees of freedom
# Null hypothesis probability = 2.826917e-01
Photon flux (15-150 keV) in 1 sec: 2.21953 ( -0.377935 0.379245 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83154e-07 ( -3.21107e-08 3.23148e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.980 sec. to 1.980 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.47343E-02 ( -1.58004 1.1261 )
Epeak [keV] : 82.0523 ( -21.5077 143.787 )
Norm@50keV : 7.90551E-02 ( -0.0790551 0.351358 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.45 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 56 degrees of freedom
# Null hypothesis probability = 3.855231e-01
Photon flux (15-150 keV) in 1 sec: 2.14145 ( -0.38658 0.38714 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74687e-07 ( -3.4315e-08 3.4169e-08 ) ergs/cm2
Band function
Time interval is from 0.980 sec. to 1.980 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 9.32917E-03 ( -5.44795 -2.95606 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 82.1535 ( -18.428 143.224 )
Norm@50keV : 7.86199E-02 ( -0.0786198 0.352095 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.45 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 55 degrees of freedom
# Null hypothesis probability = 3.499047e-01
Photon flux (15-150 keV) in 1 sec: 2.16086 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74948e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.2894 (-2.91054 3.73273)
R^2/D10^2 : 0.172573 (-0.0852508 0.154093)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.94 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.360290e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.046e-08 3.416e-09
25- 50 4.689e-08 1.335e-08
50-150 1.006e-07 3.084e-08
15-150 1.579e-07 3.805e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 9.35251 (-1.54744 1.54729)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.65 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 57 degrees of freedom
# Null hypothesis probability = 2.539098e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.329e-08 1.346e-08
25- 50 4.480e-08 2.536e-08
50-150 9.826e-08 5.600e-08
15-150 1.664e-07 9.450e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.6909 (-9.09455 -10.6891)
R1^2/D10^2 : 0.480328 (-0.240198 103299)
kT2 [keV] : 27.5713 (-13.7225 -27.568)
R2^2/D10^2 : 2.30004E-02 (-0.0227939 0.170161)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.13 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 55 degrees of freedom
# Null hypothesis probability = 3.607530e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.428e-08 8.650e-09
25- 50 4.817e-08 2.885e-08
50-150 1.141e-07 6.075e-08
15-150 1.765e-07 9.340e-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: 1.44926 ( -0.170551 0.171826 )
Norm@50keV : 4.63401E-03 ( -0.00047377 0.000472473 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.52 using 59 PHA bins.
# Reduced chi-squared = 0.7985 for 57 degrees of freedom
# Null hypothesis probability = 8.630173e-01
Photon flux (15-150 keV) in 33.17 sec: 0.570974 ( -0.0590903 0.0592032 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4711e-06 ( -1.63776e-07 1.65009e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.728859 ( -0.846621 0.711017 )
Epeak [keV] : 92.1776 ( -25.4556 890.846 )
Norm@50keV : 1.03869E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.54 using 59 PHA bins.
# Reduced chi-squared = 0.7596 for 56 degrees of freedom
# Null hypothesis probability = 9.077192e-01
Photon flux (15-150 keV) in 33.17 sec: 0.553459 ( -0.062044 0.061738 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41236e-06 ( -1.74713e-07 1.76037e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.761186 ( -0.427386 0.685159 )
beta : -9.36346 ( 9.37131 19.3713 )
Epeak [keV] : 94.7725 ( -23.6032 171.289 )
Norm@50keV : 9.97521E-03 ( -0.00400847 0.00550117 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.55 using 59 PHA bins.
# Reduced chi-squared = 0.7736 for 55 degrees of freedom
# Null hypothesis probability = 8.899531e-01
Photon flux (15-150 keV) in 33.17 sec: 0.554438 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41602e-06 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 3.55e-07
S(50-100 keV) = 5.20e-07
T90 vs. Hardness ratio plot
T90 = 26.944000005722 sec.
Hardness ratio (energy fluence ratio) = 1.46479
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.43427
Count Ratio (50-100 keV) / (15-25 keV) = 1.37279
Mask shadow pattern
IMX = 3.275944959142454E-02, IMY = 7.541145878494562E-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:
-239.776000 -5.408000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.1135 40.9465 836.8 37.8 60.3 -0.0061 -0.0 0.4 Cyg X-3
326.4314 38.3165 3.5 42.2 39.0 -1.2875 -3.3 12.2 Cyg X-2
252.6283 58.6298 2.6 23.8 136.4 0.8552 4.5 ------ UNKNOWN
209.1629 35.6181 2.2 54.2 171.0 3.7781 5.3 ------ UNKNOWN
357.3735 36.5416 2.3 49.0 5.7 1.8066 5.0 ------ UNKNOWN
58.7320 51.6261 1.9 45.9 -56.9 4.4167 6.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-5.408000 27.760000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.0292 41.0969 5.0 37.7 60.4 -0.3327 -2.3 9.4 Cyg X-3
326.0992 38.4517 19.3 42.0 39.4 0.0878 0.6 8.5 Cyg X-2
352.5852 34.0305 2.2 50.5 11.5 0.8980 5.3 ------ UNKNOWN
202.7601 36.5299 2.2 54.6 177.5 1.2103 5.3 ------ UNKNOWN
197.4027 48.6080 2.2 44.0 -173.2 0.4956 5.3 ------ UNKNOWN
93.5056 64.0738 0.8 37.0 -87.5 2.5371 15.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
273.124590 378.724590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4750 35.2909 13.2 34.0 146.8 0.1522 0.9 3.2 Her X-1
299.5801 35.1972 0.5 26.3 71.0 3.8749 25.2 0.6 Cyg X-1
307.9834 41.1243 0.0 22.5 51.5 0.3022 2.4 11.8 Cyg X-3
326.1859 38.3383 34.1 31.8 27.2 -0.0482 -0.3 1.2 Cyg X-2
225.2344 38.7309 2.3 44.9 -179.8 0.9876 5.0 ------ UNKNOWN
179.1819 61.8717 2.5 46.5 -128.4 2.1469 4.7 ------ UNKNOWN
Plot creation:
Sun May 31 03:35:49 EDT 2015