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
  300.9915    65.4134   0.0036     5.7933   130.7037         2.5913021     52.888 TRIG_00514767                 
 
Foreground time interval of the image:
 -6.312  12.277 (delta_t =  18.589 [sec])
Background time interval of the image:
-239.424  -6.312 (delta_t = 233.112 [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   -6.312 sec. to   74.460 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.37235     ( -0.088877   0.0908053 )
Norm@50keV  : 2.37752E-03    ( -0.000127864   0.000126755 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.42 using 59 PHA bins.
# Reduced chi-squared =          1.130 for     57 degrees of freedom 
# Null hypothesis probability =   2.329849e-01
 
Photon flux (15-150 keV)    in 80.77 sec: 0.432888 ( -0.0185742  0.0186542 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.8618e-06 ( -8.00383e-08  8.0527e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -6.312 sec. to   74.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.91044     (     )
Epeak [keV] : 7.80568      (   )
Norm@50keV  : 4.38881E-03    ( -0.00100627   0.00413623 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.53 using 59 PHA bins.
# Reduced chi-squared =          1.063 for     56 degrees of freedom 
# Null hypothesis probability =   3.484938e-01
 
Photon flux (15-150 keV)    in 80.77 sec: 0.417494 ( -0.021755  0.021853 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.75674e-06 ( -1.08159e-07  1.11568e-07 ) ergs/cm2
 
Band function
 
Time interval is from   -6.312 sec. to   74.460 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.17259   (     )
beta        : -8.43547    (     )
Epeak [keV] : 60.6453      (   )
Norm@50keV   : 5.72489E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         176.82 using 59 PHA bins.
# Reduced chi-squared =         3.2148 for     55 degrees of freedom 
# Null hypothesis probability =   1.045968e-14
 
Photon flux (15-150 keV)    in 80.77 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.76075e-06 ( -1.76018e-06  -1.0131e-07 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 8.82440  (  )
R^2/D10^2   : 0.289422  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         148.20 using 59 PHA bins.
# Reduced chi-squared =         2.6001 for     57 degrees of freedom 
# Null hypothesis probability =   4.741274e-10
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.507e-07   2.468e-08
25- 50  7.226e-07   3.025e-08
50-150  2.594e-07   3.146e-08
15-150  1.333e-06   5.815e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 40.9830       (-4.23736      4.96183)
Norm        : 2.63798       (-0.234673     0.261922)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.00 using 59 PHA bins.
# Reduced chi-squared =          1.105 for     57 degrees of freedom 
# Null hypothesis probability =   2.724818e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.932e-07   2.960e-08
25- 50  6.557e-07   2.843e-08
50-150  5.208e-07   6.167e-08
15-150  1.670e-06   8.158e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.96693        (-0.823768      0.984656)
R1^2/D10^2  : 2.16424        (-1.05611      2.43369)
kT2 [keV]   : 14.4580        (-2.12861      3.85785)
R2^2/D10^2  : 2.68069E-02    (-0.0176034   0.0296959)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.95 using 59 PHA bins.
# Reduced chi-squared =          1.199 for     55 degrees of freedom 
# Null hypothesis probability =   1.482323e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.092e-07   9.163e-08
25- 50  6.316e-07   9.252e-08
50-150  5.219e-07   1.211e-07
15-150  1.663e-06   2.625e-07
Peak spectrum fit
Power-law model
 
Time interval is from    5.444 sec. to    6.444 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.08890     ( -0.153965   0.160171 )
Norm@50keV  : 1.11339E-02    ( -0.00116438   0.00114206 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.85 using 59 PHA bins.
# Reduced chi-squared =         0.8921 for     57 degrees of freedom 
# Null hypothesis probability =   7.037504e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.74212 ( -0.139032  0.139087 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.03338e-07 ( -9.72776e-09  9.87927e-09 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from    5.444 sec. to    6.444 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.98872     ( -0.574544   0.0283921 )
Epeak [keV] : 4.69905      ( -2.65651 -4.20242 )
Norm@50keV  : 1.27271E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.79 using 59 PHA bins.
# Reduced chi-squared =         0.9070 for     56 degrees of freedom 
# Null hypothesis probability =   6.717410e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.73632 ( -0.07216  0.14275 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.02453e-07 ( -1.15391e-08  1.0605e-08 ) ergs/cm2
 
Band function
 
Time interval is from    5.444 sec. to    6.444 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.93094   ( -14.2603   -4.93094 )
beta        : -2.22080    ( -0.216107   0.186969 )
Epeak [keV] : 21.3996      ( -3.649 2.82964 )
Norm@50keV   : 4866.99    ( -383.892   27339.4 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.41 using 59 PHA bins.
# Reduced chi-squared =         0.8620 for     55 degrees of freedom 
# Null hypothesis probability =   7.565973e-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]    : 8.69435  (-0.871589  0.990498)
R^2/D10^2   : 1.33636  (-0.464384   0.703846)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          92.82 using 59 PHA bins.
# Reduced chi-squared =          1.628 for     57 degrees of freedom 
# Null hypothesis probability =   1.910771e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.930e-08   2.755e-09
25- 50  3.883e-08   3.910e-09
50-150  1.331e-08   3.232e-09
15-150  7.144e-08   7.275e-09
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 57.9098       (-12.9954      18.745)
Norm        : 9.17698       (-1.29081     1.46802)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.24 using 59 PHA bins.
# Reduced chi-squared =         0.9516 for     57 degrees of freedom 
# Null hypothesis probability =   5.792022e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.293e-08   2.430e-09
25- 50  3.451e-08   3.050e-09
50-150  3.811e-08   8.240e-09
15-150  9.555e-08   1.011e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.37421        (-1.23352      1.34451)
R1^2/D10^2  : 6.85200        (-2.38099      5.053)
kT2 [keV]   : 20.4173        (-6.22096      11.1276)
R2^2/D10^2  : 3.12987E-02    (-0.0127906   0.0363472)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.33 using 59 PHA bins.
# Reduced chi-squared =         0.8969 for     55 degrees of freedom 
# Null hypothesis probability =   6.900626e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.455e-08   1.079e-08
25- 50  2.973e-08   1.120e-08
50-150  4.000e-08   2.284e-08
15-150  9.427e-08   3.895e-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: 2.12932     ( -0.0682646   0.0691491 )
Norm@50keV  : 7.31739E-03    ( -0.000280338   0.00027857 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.51 using 59 PHA bins.
# Reduced chi-squared =         0.9037 for     57 degrees of freedom 
# Null hypothesis probability =   6.802865e-01
 
Photon flux (15-150 keV)    in 18.59 sec: 1.16815 ( -0.0423871  0.0425875 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.2677e-06 ( -4.42998e-08  4.44407e-08 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.66453     ( -0.306931   0.285312 )
Epeak [keV] : 32.5148      (   )
Norm@50keV  : 1.29497E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.45 using 59 PHA bins.
# Reduced chi-squared =         0.7759 for     56 degrees of freedom 
# Null hypothesis probability =   8.895522e-01
 
Photon flux (15-150 keV)    in 18.59 sec: 1.12689 ( -0.0485  0.04872 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.2099e-06 ( -5.54317e-08  5.58165e-08 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.48729   ( -0.379861   6.44001 )
beta        : -2.43013    ( 2.43082   0.261012 )
Epeak [keV] : 33.3116      ( -16.1289 6.40595 )
Norm@50keV   : 1.66742E-02    ( -0.00637718   792.88 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.75 using 59 PHA bins.
# Reduced chi-squared =         0.7772 for     55 degrees of freedom 
# Null hypothesis probability =   8.856558e-01
 
Photon flux (15-150 keV)    in 18.59 sec: 1.11685 ( 5.88315  -0.02647 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.21319e-06 ( 0  0 ) ergs/cm2
 
 S(25-50 keV) vs. S(50-100 keV) plot 
 
S(25-50 keV)  = 6.08e-07
S(50-100 keV) = 4.70e-07
 T90 vs. Hardness ratio plot 
 
T90                                   = 41.0279999375343 sec.
Hardness ratio (energy fluence ratio) = 0.773026
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 0.853435
Count Ratio (50-100 keV) / (15-25 keV) = 0.306309
 Mask shadow pattern 
 
IMX = -6.616570248434049E-02, IMY = -7.691472735699574E-02
 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:
-239.424000 -6.312000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5093  35.4545    8.1  36.5    0.2   0.3238   1.4    7.2	Her X-1                       
299.5651  35.2071    0.8  24.8  -72.4   2.9489  14.3    1.3	Cyg X-1                       
308.0724  40.9445    1.1  20.3  -92.2   2.1085  10.6    1.8	Cyg X-3                       
326.0378  38.4359    3.7  28.3 -120.7   0.6383   3.1    9.3	Cyg X-2                       
256.8352  42.3730    3.1  29.9    5.2   0.6749   3.7 ------	UNKNOWN                       
342.2834  27.2205    2.8  44.9 -130.8   1.8627   4.1 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-6.312000 12.276600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4518  35.1744   64.3  36.7   -0.0  -0.0126  -0.2   10.1	Her X-1                       
299.5085  35.1274  764.5  24.9  -72.2  -0.0009  -0.0    6.0	Cyg X-1                       
308.2299  41.1013    9.3  20.1  -92.7   0.0684   1.2   10.4	Cyg X-3                       
326.0485  38.4617    4.1  28.3 -120.8  -0.1776  -2.8   10.2	Cyg X-2                       
300.9915  65.4134    0.2   5.8  130.7   2.5914  52.9 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
37.676600 962.648000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4893  35.4049   11.9  40.5    0.3   0.6850   1.0    4.1	Her X-1                       
299.5857  35.2170    0.8  30.2  -62.9   8.9550  13.7    0.9	Cyg X-1                       
308.1302  40.9803    0.8  24.7  -78.2   8.3939  14.9    1.9	Cyg X-3                       
326.0064  38.2893    3.3  30.7 -105.7   2.1401   3.5    8.0	Cyg X-2                       
261.7763  31.2312    3.1  41.6  -10.8   2.3070   3.7 ------	UNKNOWN                       
274.7038  14.1014    3.4  54.3  -33.3   7.5217   3.4 ------	UNKNOWN                       
Plot creation:
Sat May 30 20:20:11 EDT 2015