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
   54.3070   -89.0292   0.0227    30.6493  -115.8824         0.3581574      8.502 TRIG_00519256                 
 
Foreground time interval of the image:
 -2.960   5.328 (delta_t =   8.288 [sec])
Background time interval of the image:
-239.544  -2.960 (delta_t = 236.584 [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 2.048000
 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 2.048000
 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 2.048000
 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   -2.960 sec. to    5.328 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.78539     ( -0.3044   0.323164 )
Norm@50keV  : 2.72359E-03    ( -0.000566875   0.000550322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.17 using 59 PHA bins.
# Reduced chi-squared =         0.8275 for     57 degrees of freedom 
# Null hypothesis probability =   8.203205e-01
 
Photon flux (15-150 keV)    in 8.288 sec: 0.373201 ( -0.0667689  0.0667985 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.07927e-07 ( -4.32647e-08  4.44146e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -2.960 sec. to    5.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.30320     ( -1.21354   0.788509 )
Epeak [keV] : 65.6204      ( -50.2363 -65.5337 )
Norm@50keV  : 5.01920E-03    ( -0.00503311   0.0179079 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.47 using 59 PHA bins.
# Reduced chi-squared =         0.8299 for     56 degrees of freedom 
# Null hypothesis probability =   8.140274e-01
 
Photon flux (15-150 keV)    in 8.288 sec: 0.367883 ( -0.067484  0.067573 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.00303e-07 ( -4.51812e-08  4.69399e-08 ) ergs/cm2
 
Band function
 
Time interval is from   -2.960 sec. to    5.328 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.31872   ( -1.68667   1.18358 )
beta        : -9.37167    ( 9.37167   19.3717 )
Epeak [keV] : 67.3169      ( -38.5211 -67.3146 )
Norm@50keV   : 4.88981E-03    ( -0.00206653   0.0179859 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.48 using 59 PHA bins.
# Reduced chi-squared =         0.8450 for     55 degrees of freedom 
# Null hypothesis probability =   7.865043e-01
 
Photon flux (15-150 keV)    in 8.288 sec: 0.368743 ( 6.63126  -0.065511 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.99249e-07 ( -1.99191e-07  -4.34697e-08 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 12.0592  (-3.13422  4.01919)
R^2/D10^2   : 8.74363E-02  (-0.0557879   0.176046)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.74 using 59 PHA bins.
# Reduced chi-squared =         0.9954 for     57 degrees of freedom 
# Null hypothesis probability =   4.848245e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.230e-08   8.429e-09
25- 50  7.058e-08   2.148e-08
50-150  6.192e-08   2.423e-08
15-150  1.548e-07   5.002e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 105.899       (-48.9606      -104.814)
Norm        : 1.63145       (-0.328571     0.498016)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.49 using 59 PHA bins.
# Reduced chi-squared =         0.8156 for     57 degrees of freedom 
# Null hypothesis probability =   8.385935e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.533e-08   1.002e-08
25- 50  6.179e-08   2.655e-08
50-150  1.034e-07   7.201e-08
15-150  2.005e-07   1.135e-07
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.29804        (-1.55265      2.15584)
R1^2/D10^2  : 1.32545        (-0.976315      4.23391)
kT2 [keV]   : 21.4390        (-5.93462      11.2706)
R2^2/D10^2  : 8.54415E-03    (-0.0066552   0.0207933)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.62 using 59 PHA bins.
# Reduced chi-squared =         0.7931 for     55 degrees of freedom 
# Null hypothesis probability =   8.655840e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.959e-08   2.209e-08
25- 50  5.689e-08   3.051e-08
50-150  1.102e-07   6.734e-08
15-150  2.067e-07   1.089e-07
Peak spectrum fit
Power-law model
 
Time interval is from    0.916 sec. to    1.916 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.30185     ( -0.347462   0.343366 )
Norm@50keV  : 7.93181E-03    ( -0.0016454   0.00164409 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.37 using 59 PHA bins.
# Reduced chi-squared =         0.9364 for     57 degrees of freedom 
# Null hypothesis probability =   6.119647e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.946604 ( -0.20267  0.203494 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.83457e-08 ( -1.7553e-08  1.7729e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from    0.916 sec. to    1.916 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.525822     ( -1.91716   0.972528 )
Epeak [keV] : 105.622      (   )
Norm@50keV  : 1.81233E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.43 using 59 PHA bins.
# Reduced chi-squared =         0.9363 for     56 degrees of freedom 
# Null hypothesis probability =   6.107376e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.920366 ( -0.210931  0.209424 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.6219e-08 ( -1.80505e-08  1.8262e-08 ) ergs/cm2
 
Band function
 
Time interval is from    0.916 sec. to    1.916 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.606376   ( -0.77245   2.16199 )
beta        : -10.0000    ( 10   0 )
Epeak [keV] : 110.994      ( -45.6669 606.347 )
Norm@50keV   : 1.68348E-02    ( -0.01007   0.0993662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.44 using 59 PHA bins.
# Reduced chi-squared =         0.9535 for     55 degrees of freedom 
# Null hypothesis probability =   5.729223e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.940273 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.63279e-08 ( 0  0 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 18.9824  (-4.00848  5.42462)
R^2/D10^2   : 5.24565E-02  (-0.0301878   0.0644236)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.08 using 59 PHA bins.
# Reduced chi-squared =         0.9664 for     57 degrees of freedom 
# Null hypothesis probability =   5.473111e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.717e-09   1.779e-09
25- 50  1.786e-08   6.087e-09
50-150  4.730e-08   1.920e-08
15-150  6.888e-08   2.473e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 3.95838       (-0.827773     0.827708)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.47 using 59 PHA bins.
# Reduced chi-squared =         0.9556 for     57 degrees of freedom 
# Null hypothesis probability =   5.705421e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.857e-09   5.745e-09
25- 50  1.896e-08   1.102e-08
50-150  4.159e-08   2.419e-08
15-150  7.041e-08   4.147e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.75573        (-2.17006      8.09549)
R1^2/D10^2  : 2.88201        (-2.80099      18.4756)
kT2 [keV]   : 22.5424        (-5.6461      14.3598)
R2^2/D10^2  : 2.68374E-02    (-0.0229835   0.0453728)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.26 using 59 PHA bins.
# Reduced chi-squared =         0.9320 for     55 degrees of freedom 
# Null hypothesis probability =   6.182343e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.207e-09   4.577e-09
25- 50  1.667e-08   9.060e-09
50-150  5.093e-08   2.978e-08
15-150  7.581e-08   4.033e-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: 1.78539     ( -0.3044   0.323164 )
Norm@50keV  : 2.72359E-03    ( -0.000566875   0.000550322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.17 using 59 PHA bins.
# Reduced chi-squared =         0.8275 for     57 degrees of freedom 
# Null hypothesis probability =   8.203205e-01
 
Photon flux (15-150 keV)    in 8.288 sec: 0.373201 ( -0.0667689  0.0667985 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.07927e-07 ( -4.32647e-08  4.44146e-08 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.30320     ( -1.21354   0.788509 )
Epeak [keV] : 65.6204      ( -50.2363 -65.5337 )
Norm@50keV  : 5.01920E-03    ( -0.00503311   0.0179079 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.47 using 59 PHA bins.
# Reduced chi-squared =         0.8299 for     56 degrees of freedom 
# Null hypothesis probability =   8.140274e-01
 
Photon flux (15-150 keV)    in 8.288 sec: 0.367883 ( -0.067484  0.067573 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.00303e-07 ( -4.51812e-08  4.69399e-08 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.31872   ( -1.68667   1.18358 )
beta        : -9.37167    ( 9.37167   19.3717 )
Epeak [keV] : 67.3169      ( -38.5211 -67.3146 )
Norm@50keV   : 4.88981E-03    ( -0.00206653   0.0179859 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.48 using 59 PHA bins.
# Reduced chi-squared =         0.8450 for     55 degrees of freedom 
# Null hypothesis probability =   7.865043e-01
 
Photon flux (15-150 keV)    in 8.288 sec: 0.368743 ( 6.63126  -0.065511 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.99249e-07 ( -1.99191e-07  -4.34697e-08 ) ergs/cm2
 
 S(25-50 keV) vs. S(50-100 keV) plot 
 
S(25-50 keV)  = 5.82e-08
S(50-100 keV) = 6.76e-08
 T90 vs. Hardness ratio plot 
 
T90                                   = 7.28399991989136 sec.
Hardness ratio (energy fluence ratio) = 1.16151
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 0.805242
Count Ratio (50-100 keV) / (15-25 keV) = 0.737292
 Mask shadow pattern 
 
IMX = -2.586676173132431E-01, IMY = 5.331216493044129E-01
 TIME vs. PHA plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
 TIME vs. DetID plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
 100 us light curve (15-350 keV)
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
 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:
-239.544000 -2.960000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5427 -40.5474    1.0  24.9   10.9   2.2412  11.7    0.8	Vela X-1                      
170.2062 -60.6001   26.2   4.6  168.2  -0.0773  -0.4    3.5	Cen X-3                       
186.6561 -62.7860    0.8  12.6  177.6   2.7218  15.2    0.9	GX 301-2                      
156.7784 -18.6250    3.0  41.1   55.9   2.0402   3.8 ------	UNKNOWN                       
179.6549 -68.7470    2.4  12.0 -151.1   0.7711   4.9 ------	UNKNOWN                       
 80.9007 -41.4260    4.3  50.6  -44.7   2.4650   2.7 ------	UNKNOWN                       
 81.6671 -39.1189    3.1  52.0  -42.2   3.3412   3.8 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-2.960000 5.328000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.3861 -40.4508   11.6  25.0   10.7  -0.0291  -1.0    9.0	Vela X-1                      
169.9757 -60.7215    6.6   4.5  169.9   0.0460   1.7   11.6	Cen X-3                       
186.2994 -62.9017    0.0  12.4  178.2  -0.0332  -1.2   12.6	GX 301-2                      
210.9721 -33.3879    2.9  41.6  135.9   0.2961   4.0 ------	UNKNOWN                       
204.3173 -61.4376    2.3  20.9  175.9   0.1409   5.1 ------	UNKNOWN                       
 54.3051 -89.0291    1.4  30.6 -115.9   0.3582   8.5 ------	UNKNOWN                       
286.4167 -68.8699    2.5  45.6 -142.1   0.2853   4.6 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
 
Plot creation:
Fri Jun 12 02:02:38 EDT 2015