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
  294.7439    40.3965   0.0157    21.3905   -79.6823         0.4333063     12.330 TRIG_00349931                 
 
Foreground time interval of the image:
 -0.392   8.496 (delta_t =   8.888 [sec])
Background time interval of the image:
-239.444  -0.392 (delta_t = 239.052 [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 0.064000
 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 0.064000
 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 0.064000
 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   -0.392 sec. to    8.496 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.67905     ( -0.282721   0.294626 )
Norm@50keV  : 2.87645E-03    ( -0.000474163   0.000453746 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.68 using 59 PHA bins.
# Reduced chi-squared =         0.9067 for     57 degrees of freedom 
# Null hypothesis probability =   6.742088e-01
 
Photon flux (15-150 keV)    in 8.888 sec: 0.379269 ( -0.0530366  0.0530632 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.3712e-07 ( -4.08605e-08  4.18324e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -0.392 sec. to    8.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.67888     ( -0.388345   0.278493 )
Epeak [keV] : 1.00000E+04      (   )
Norm@50keV  : 2.88077E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.69 using 59 PHA bins.
# Reduced chi-squared =         0.9231 for     56 degrees of freedom 
# Null hypothesis probability =   6.384822e-01
 
Photon flux (15-150 keV)    in 8.888 sec: 0.379254 ( -0.05274  0.052819 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.35783e-07 ( -3.90432e-08  3.93712e-08 ) ergs/cm2
 
Band function
 
Time interval is from   -0.392 sec. to    8.496 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.39026   ( 1.39026   1.39026 )
beta        : -1.67898    ( 1.67898   0.282744 )
Epeak [keV] : 14.9974      ( -14.9968 -14.9968 )
Norm@50keV   : 6.74488E-03    ( -0.0043014   0.0790206 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.68 using 59 PHA bins.
# Reduced chi-squared =         0.9397 for     55 degrees of freedom 
# Null hypothesis probability =   6.022196e-01
 
Photon flux (15-150 keV)    in 8.888 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]    : 10.9585  (-2.66707  4.19383)
R^2/D10^2   : 0.117639  (-0.11536   0.212371)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          80.89 using 59 PHA bins.
# Reduced chi-squared =          1.419 for     57 degrees of freedom 
# Null hypothesis probability =   2.042552e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.622e-08   8.257e-09
25- 50  7.377e-08   1.621e-08
50-150  4.989e-08   1.844e-08
15-150  1.499e-07   3.822e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 181.183       (-99.97      -181.964)
Norm        : 1.51832       (-0.219147     0.304601)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.86 using 59 PHA bins.
# Reduced chi-squared =         0.9624 for     57 degrees of freedom 
# Null hypothesis probability =   5.558576e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.400e-08   1.914e-08
25- 50  6.466e-08   3.485e-08
50-150  1.372e-07   7.559e-08
15-150  2.359e-07   1.306e-07
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.70388        (-1.4173      1.82214)
R1^2/D10^2  : 1.17214        (-0.772554      2.71614)
kT2 [keV]   : 41.8963        (-16.9824      112.122)
R2^2/D10^2  : 1.24636E-03    (-0.00105   0.00398014)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.61 using 59 PHA bins.
# Reduced chi-squared =         0.8657 for     55 degrees of freedom 
# Null hypothesis probability =   7.498665e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.415e-08   1.869e-08
25- 50  5.396e-08   2.243e-08
50-150  1.722e-07   9.849e-08
15-150  2.704e-07   1.211e-07
Peak spectrum fit
Power-law model
 
Time interval is from   -0.372 sec. to    0.628 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.30087     ( -0.173281   0.172083 )
Norm@50keV  : 1.42748E-02    ( -0.00146283   0.00145866 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.76 using 59 PHA bins.
# Reduced chi-squared =          1.013 for     57 degrees of freedom 
# Null hypothesis probability =   4.470572e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.70330 ( -0.175928  0.176091 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.41033e-07 ( -1.61457e-08  1.6291e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -0.372 sec. to    0.628 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.980617     ( -0.765938   0.30265 )
Epeak [keV] : 160.387      ( -160.453 -160.453 )
Norm@50keV  : 2.07602E-02    ( -0.00769518   0.0288221 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.09 using 59 PHA bins.
# Reduced chi-squared =          1.019 for     56 degrees of freedom 
# Null hypothesis probability =   4.344870e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.68435 ( -0.09048  0.18006 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.37638e-07 ( -1.8064e-08  1.7791e-08 ) ergs/cm2
 
Band function
 
Time interval is from   -0.372 sec. to    0.628 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 5.00000   ( -5.52821   -5 )
beta        : -1.43439    ( -0.216601   0.205079 )
Epeak [keV] : 27.0966      ( -6.62778 5.23938 )
Norm@50keV   : 815.537    ( -82.1648   3561.97 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.99 using 59 PHA bins.
# Reduced chi-squared =         0.9816 for     55 degrees of freedom 
# Null hypothesis probability =   5.133753e-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]    : 16.3163  (-2.06135  2.44391)
R^2/D10^2   : 0.151208  (-0.0570613   0.0883771)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          75.37 using 59 PHA bins.
# Reduced chi-squared =          1.322 for     57 degrees of freedom 
# Null hypothesis probability =   5.204932e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.286e-09   1.588e-09
25- 50  3.545e-08   4.850e-09
50-150  6.644e-08   1.307e-08
15-150  1.102e-07   1.535e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 7.02493       (-0.71952     0.719493)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.38 using 59 PHA bins.
# Reduced chi-squared =          1.094 for     57 degrees of freedom 
# Null hypothesis probability =   2.909975e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.750e-08   9.705e-09
25- 50  3.366e-08   1.592e-08
50-150  7.381e-08   4.060e-08
15-150  1.250e-07   6.805e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.95964        (-3.7301      3.84634)
R1^2/D10^2  : 0.768976        (-0.407186      2.1006)
kT2 [keV]   : 36.2758        (-36.1656      -41.9968)
R2^2/D10^2  : 7.82335E-03    (-0.00435224   0.0402815)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.67 using 59 PHA bins.
# Reduced chi-squared =          1.030 for     55 degrees of freedom 
# Null hypothesis probability =   4.124770e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.341e-08   6.640e-09
25- 50  3.472e-08   1.653e-08
50-150  8.883e-08   4.756e-08
15-150  1.370e-07   6.398e-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: 1.67905     ( -0.282721   0.294626 )
Norm@50keV  : 2.87645E-03    ( -0.000474163   0.000453746 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.68 using 59 PHA bins.
# Reduced chi-squared =         0.9067 for     57 degrees of freedom 
# Null hypothesis probability =   6.742088e-01
 
Photon flux (15-150 keV)    in 8.888 sec: 0.379269 ( -0.0530366  0.0530632 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.3712e-07 ( -4.08605e-08  4.18324e-08 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.67888     ( -0.388345   0.278493 )
Epeak [keV] : 1.00000E+04      (   )
Norm@50keV  : 2.88077E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.69 using 59 PHA bins.
# Reduced chi-squared =         0.9231 for     56 degrees of freedom 
# Null hypothesis probability =   6.384822e-01
 
Photon flux (15-150 keV)    in 8.888 sec: 0.379254 ( -0.05274  0.052819 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.35783e-07 ( -3.90432e-08  3.93712e-08 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.39026   ( 1.39026   1.39026 )
beta        : -1.67898    ( 1.67898   0.282744 )
Epeak [keV] : 14.9974      ( -14.9968 -14.9968 )
Norm@50keV   : 6.74488E-03    ( -0.0043014   0.0790206 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.68 using 59 PHA bins.
# Reduced chi-squared =         0.9397 for     55 degrees of freedom 
# Null hypothesis probability =   6.022196e-01
 
Photon flux (15-150 keV)    in 8.888 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)  = 6.36e-08
S(50-100 keV) = 7.95e-08
 T90 vs. Hardness ratio plot 
 
T90                                   = 8.47600001096725 sec.
Hardness ratio (energy fluence ratio) = 1.25
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 0.887903
Count Ratio (50-100 keV) / (15-25 keV) = 0.716636
 Mask shadow pattern 
 
IMX = 7.015688471606696E-02, IMY = 3.853698884002041E-01
 TIME vs. PHA plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
 TIME vs. DetID plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
 100 us light curve (15-350 keV)
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
 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:
-239.444000 -0.392000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5309  35.3511    7.9  12.4  139.9   0.2730   1.5    3.6	Her X-1                       
268.3829  -1.4396    6.8  34.9   38.4   0.5054   1.7    1.2	SW J1753.5-0127               
274.0040 -14.0360    8.7  47.7   30.6   0.9861   1.3    0.1	GX 17+2                       
288.7641  10.9564    0.8  28.7   -6.2   2.8908  14.2    2.1	GRS 1915+105                  
299.5872  35.2053    0.3  25.0  -66.0   8.5609  36.2    0.3	Cyg X-1                       
308.1765  41.0625    4.4  31.6  -78.7   0.8168   2.6    7.2	Cyg X-3                       
231.2929  20.5267    3.3  36.0  115.6   1.5512   3.5 ------	UNKNOWN                       
255.4201   7.5872    3.0  28.9   66.3   1.2001   3.9 ------	UNKNOWN                       
270.4597   3.3046    2.5  30.1   34.5   1.1389   4.5 ------	UNKNOWN                       
217.6351  52.9853    2.6  41.3  171.0   1.4114   4.4 ------	UNKNOWN                       
319.9033  62.9160    3.0  43.0 -112.2   3.2976   3.8 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-0.392000 8.496000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3488  35.4643    6.3  12.5  140.4  -0.0584  -1.8    9.0	Her X-1                       
268.4125  -1.5502    3.6  35.0   38.3   0.1770   3.2    6.4	SW J1753.5-0127               
274.1412 -14.1256    6.7  47.8   30.4   0.2162   1.7    9.5	GX 17+2                       
288.7671  10.9460   26.6  28.7   -6.2   0.0155   0.4    1.8	GRS 1915+105                  
299.8094  35.1235    0.0  25.1  -65.8   0.0556   1.4   11.7	Cyg X-1                       
308.1292  40.9170    8.5  31.5  -78.4   0.0725   1.4    2.3	Cyg X-3                       
209.6112  45.9004    2.5  46.5  160.8   0.3238   4.6 ------	UNKNOWN                       
266.8997   9.1547    2.1  24.4   42.6   0.2157   5.5 ------	UNKNOWN                       
204.3335  67.8298    2.3  50.0 -169.8   0.3308   5.0 ------	UNKNOWN                       
294.7439  40.3966    0.9  21.4  -79.7   0.4334  12.3 ------	UNKNOWN                       
258.5004  72.8842    2.1  39.9 -148.2   0.2608   5.4 ------	UNKNOWN                       
296.7044  67.0470    2.6  37.2 -126.0   0.2308   4.5 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
53.256590 962.632500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5191  35.3671   12.8  31.9  107.0  -0.8887  -0.9    3.4	Her X-1                       
288.8000  10.9366    0.7  29.9   24.6  10.2510  15.8    0.5	GRS 1915+105                  
299.5861  35.2015    0.2   6.4  -25.2  32.5421  66.6    0.2	Cyg X-1                       
308.1078  40.9896    1.5  10.2  -84.9   3.8908   7.6    2.2	Cyg X-3                       
326.1938  38.2926    7.7  24.3  -82.5   1.1022   1.5    2.0	Cyg X-2                       
275.5612  33.3766    3.0  16.8   84.4   2.1593   3.9 ------	UNKNOWN                       
277.5287  55.5176    2.7  18.9  161.8   2.2072   4.3 ------	UNKNOWN                       
199.8665  78.6819    2.9  51.5  178.4   5.8691   4.0 ------	UNKNOWN                       
135.8655  80.4408    2.9  58.6 -171.1  15.9320   4.0 ------	UNKNOWN                       
116.1237  87.0853    3.0  52.5 -167.2   6.1130   3.9 ------	UNKNOWN                       
 51.3122  83.1585    3.9  53.0 -159.4   4.5827   2.9 ------	UNKNOWN                       
336.9942  59.6214    3.3  32.4 -127.8   2.6084   3.5 ------	UNKNOWN                       
Plot creation:
Sun May 31 04:21:11 EDT 2015