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
  333.5699   -26.6012   0.0165    46.0716    20.2673         0.9025207     11.569 TRIG_00351588                 
 
Foreground time interval of the image:
 -0.128   6.224 (delta_t =   6.352 [sec])
Background time interval of the image:
-212.715  -0.128 (delta_t = 212.587 [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 0.256000
 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 0.256000
 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 0.256000
 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   -0.128 sec. to    6.224 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.04914     ( -0.514194   0.635132 )
Norm@50keV  : 1.74053E-03    ( -0.000760864   0.000771407 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.53 using 59 PHA bins.
# Reduced chi-squared =          1.009 for     57 degrees of freedom 
# Null hypothesis probability =   4.556077e-01
 
Photon flux (15-150 keV)    in 6.352 sec: 0.267035 ( -0.0964  0.0963613 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.03045e-07 ( -4.09559e-08  4.44775e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -0.128 sec. to    6.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -3.85276     (     )
Epeak [keV] : 38.2391      ( -7.87159 11.333 )
Norm@50keV  : 5.54975    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.62 using 59 PHA bins.
# Reduced chi-squared =         0.9040 for     56 degrees of freedom 
# Null hypothesis probability =   6.777999e-01
 
Photon flux (15-150 keV)    in 6.352 sec: 0.252729 ( -0.087434  0.092031 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.7178e-08 ( -3.03405e-08  3.57338e-08 ) ergs/cm2
 
Band function
 
Time interval is from   -0.128 sec. to    6.224 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 3.65339   ( -2.75179   -2.10131 )
beta        : -10.0000    ( 10   1.24345e-14 )
Epeak [keV] : 38.2852      ( -9.76942 11.342 )
Norm@50keV   : 4.25152    ( -4.24993   10.6448 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.62 using 59 PHA bins.
# Reduced chi-squared =         0.9203 for     55 degrees of freedom 
# Null hypothesis probability =   6.426931e-01
 
Photon flux (15-150 keV)    in 6.352 sec: 0.254638 ( 6.74536  -0.086365 ) 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]    : 10.0225  (-2.43135  3.17937)
R^2/D10^2   : 0.146975  (-0.146975   0.274372)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.01 using 59 PHA bins.
# Reduced chi-squared =         0.8950 for     57 degrees of freedom 
# Null hypothesis probability =   6.979252e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.911e-08   1.198e-08
25- 50  4.767e-08   2.933e-08
50-150  2.504e-08   1.899e-08
15-150  9.183e-08   5.764e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 53.7766       (-27.2159      95.818)
Norm        : 1.54738       (-0.651646     1.04717)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.01 using 59 PHA bins.
# Reduced chi-squared =         0.9650 for     57 degrees of freedom 
# Null hypothesis probability =   5.502093e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.441e-08   1.625e-08
25- 50  3.595e-08   2.743e-08
50-150  3.732e-08   5.323e-08
15-150  9.769e-08   9.804e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 0.270589        (-0.270589      -0.270589)
R1^2/D10^2  : 2.29132E-03        (-0.00229132      -0.00229132)
kT2 [keV]   : 10.0228        (-2.43165      3.17907)
R2^2/D10^2  : 0.146958    (-0.0979935   0.273758)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.01 using 59 PHA bins.
# Reduced chi-squared =         0.9275 for     55 degrees of freedom 
# Null hypothesis probability =   6.276226e-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
Peak spectrum fit
Power-law model
 
Time interval is from   -0.316 sec. to    0.684 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.894917     ( -0.212476   0.20321 )
Norm@50keV  : 3.82889E-02    ( -0.00469858   0.00464467 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.16 using 59 PHA bins.
# Reduced chi-squared =         0.8098 for     57 degrees of freedom 
# Null hypothesis probability =   8.472341e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.39452 ( -0.536169  0.53836 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.30553e-07 ( -5.30098e-08  5.32179e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -0.316 sec. to    0.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.567904     ( -0.924107   0.426409 )
Epeak [keV] : 262.489      ( -264.472 -264.472 )
Norm@50keV  : 5.26269E-02    ( -0.0182384   0.0707868 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.66 using 59 PHA bins.
# Reduced chi-squared =         0.8153 for     56 degrees of freedom 
# Null hypothesis probability =   8.366253e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.34195 ( -0.55031  0.55207 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.26378e-07 ( -5.5346e-08  5.4661e-08 ) ergs/cm2
 
Band function
 
Time interval is from   -0.316 sec. to    0.684 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 5.00000   ( -5   -5 )
beta        : -0.929306    ( -0.220937   0.223798 )
Epeak [keV] : 26.5398      ( -26.5309 17.8798 )
Norm@50keV   : 1672.23    ( -194.95   6.27802e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.62 using 59 PHA bins.
# Reduced chi-squared =         0.8295 for     55 degrees of freedom 
# Null hypothesis probability =   8.122859e-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]    : 24.5881  (-3.7507  4.85281)
R^2/D10^2   : 0.114961  (-0.0482923   0.0770932)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.99 using 59 PHA bins.
# Reduced chi-squared =         0.9647 for     57 degrees of freedom 
# Null hypothesis probability =   5.509513e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.218e-08   3.147e-09
25- 50  6.851e-08   1.406e-08
50-150  3.078e-07   6.220e-08
15-150  3.885e-07   6.990e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-22.7955      -200)
Norm        : 17.9245       (-2.23536     2.23536)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.76 using 59 PHA bins.
# Reduced chi-squared =          1.294 for     57 degrees of freedom 
# Null hypothesis probability =   6.690939e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.465e-08   2.534e-08
25- 50  8.588e-08   4.730e-08
50-150  1.883e-07   1.037e-07
15-150  3.189e-07   1.763e-07
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 9.98337        (-4.28991      6.9277)
R1^2/D10^2  : 0.953953        (-0.695741      4.23978)
kT2 [keV]   : 40.4581        (-13.1981      -40.482)
R2^2/D10^2  : 2.18379E-02    (-0.0209567   0.0547611)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.06 using 59 PHA bins.
# Reduced chi-squared =         0.8193 for     55 degrees of freedom 
# Null hypothesis probability =   8.281644e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.393e-08   1.389e-08
25- 50  7.931e-08   4.205e-08
50-150  3.284e-07   1.767e-07
15-150  4.316e-07   2.243e-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: 1.06233     ( -0.273625   0.259139 )
Norm@50keV  : 9.17981E-03    ( -0.00136551   0.00134233 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.45 using 59 PHA bins.
# Reduced chi-squared =         0.9201 for     57 degrees of freedom 
# Null hypothesis probability =   6.463856e-01
 
Photon flux (15-150 keV)    in 6.352 sec: 1.06132 ( -0.163814  0.164868 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.17162e-07 ( -9.00847e-08  9.04874e-08 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.06368     ( -0.282568   0.254467 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 9.24185E-03    ( -0.00135188   0.00832076 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.46 using 59 PHA bins.
# Reduced chi-squared =         0.9368 for     56 degrees of freedom 
# Null hypothesis probability =   6.096321e-01
 
Photon flux (15-150 keV)    in 6.352 sec: 1.06484 ( -0.167606  0.15797 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.15875e-07 ( -8.89629e-08  9.14834e-08 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.871448   ( 0.871414   0.871414 )
beta        : -1.06232    ( 1.06232   0.273619 )
Epeak [keV] : 47.9319      ( -47.9713 -47.9713 )
Norm@50keV   : 1.57233E-02    ( -0.00687401   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.45 using 59 PHA bins.
# Reduced chi-squared =         0.9536 for     55 degrees of freedom 
# Null hypothesis probability =   5.728273e-01
 
Photon flux (15-150 keV)    in 6.352 sec:  (    ) 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)  = 3.13e-08
S(50-100 keV) = 3.07e-08
 T90 vs. Hardness ratio plot 
 
T90                                   = 5.66399997472763 sec.
Hardness ratio (energy fluence ratio) = 0.980831
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.33114
Count Ratio (50-100 keV) / (15-25 keV) = 1.66918
 Mask shadow pattern 
 
IMX = 9.738492822632381E-01, IMY = -3.596064605939755E-01
 TIME vs. PHA plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
 TIME vs. DetID plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
 100 us light curve (15-350 keV)
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
 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:
-212.715400 -0.128000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5797  35.1877    0.5  34.7  143.2   7.1896  23.9    1.0	Cyg X-1                       
308.0275  40.9324    1.9  31.2  158.2   1.4273   6.0    3.9	Cyg X-3                       
326.1242  38.2501    8.6  20.2  179.2   0.2327   1.3    4.8	Cyg X-2                       
344.0508 -18.5084    2.1  39.1    4.7   1.5026   5.6 ------	UNKNOWN                       
347.0993  -1.7928    2.1  24.5  -12.4   0.9835   5.4 ------	UNKNOWN                       
351.7921  31.3488    2.7  19.5 -112.1   0.7462   4.3 ------	UNKNOWN                       
 18.5931   9.2361    3.0  43.6  -64.0   3.4926   3.8 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-0.128000 6.224000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5288  35.3447    4.1  34.7  143.5  -0.1322  -2.8    9.1	Cyg X-1                       
308.0613  41.0511    3.1  31.3  158.4   0.1296   3.7    6.3	Cyg X-3                       
326.0816  38.1283    0.0  20.1  179.0  -0.0460  -1.8   12.4	Cyg X-2                       
312.6863 -14.8924    2.5  40.6   52.7   0.4419   4.7 ------	UNKNOWN                       
333.5700 -26.6012    1.0  46.1   20.3   0.9024  11.6 ------	UNKNOWN                       
  1.7474  76.2894    2.7  58.5 -153.8   0.6752   4.3 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
78.284590 962.844000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 35.8112 -41.4906    3.1  52.5  -33.3   6.1886   3.8 ------	UNKNOWN                       
350.0788  19.2221    2.8  48.6 -135.7   7.9176   4.2 ------	UNKNOWN                       
Plot creation:
Thu Aug 13 13:31:22 EDT 2015