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
   32.3186   -67.9914   0.0159     6.8226    -4.3614         0.3437399     12.087 TRIG_00416115                 
 
Foreground time interval of the image:
 -3.028   6.904 (delta_t =   9.932 [sec])
Background time interval of the image:
-239.120  -3.028 (delta_t = 236.092 [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 4.096000
 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 4.096000
 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 4.096000
 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   -3.028 sec. to    6.904 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.56987     ( -0.254157   0.263145 )
Norm@50keV  : 1.95225E-03    ( -0.000301761   0.000294819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.05 using 59 PHA bins.
# Reduced chi-squared =         0.8606 for     57 degrees of freedom 
# Null hypothesis probability =   7.638575e-01
 
Photon flux (15-150 keV)    in 9.932 sec: 0.248589 ( -0.0346267  0.0346418 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.82036e-07 ( -3.04892e-08  3.1195e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -3.028 sec. to    6.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.56781     ( -0.911164   0.350472 )
Epeak [keV] : 9995.67      (   )
Norm@50keV  : 1.95729E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.05 using 59 PHA bins.
# Reduced chi-squared =         0.8760 for     56 degrees of freedom 
# Null hypothesis probability =   7.330188e-01
 
Photon flux (15-150 keV)    in 9.932 sec: 0.248520 ( -0.035184  0.034606 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.82074e-07 ( -3.36278e-08  3.09243e-08 ) ergs/cm2
 
Band function
 
Time interval is from   -3.028 sec. to    6.904 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.34234   ( 1.34234   1.34234 )
beta        : -1.56987    ( 1.56987   0.254227 )
Epeak [keV] : 30.7682      ( -30.7682 -30.7682 )
Norm@50keV   : 3.48506E-03    ( -0.00180577   0.0773838 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.05 using 59 PHA bins.
# Reduced chi-squared =         0.8919 for     55 degrees of freedom 
# Null hypothesis probability =   7.000853e-01
 
Photon flux (15-150 keV)    in 9.932 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]    : 13.7366  (-2.52961  3.19085)
R^2/D10^2   : 3.71266E-02  (-0.0191569   0.039001)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.61 using 59 PHA bins.
# Reduced chi-squared =          1.134 for     57 degrees of freedom 
# Null hypothesis probability =   2.279855e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.472e-08   4.427e-09
25- 50  5.372e-08   1.073e-08
50-150  6.608e-08   2.200e-08
15-150  1.345e-07   2.996e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 198.394       (-103.361      -198.355)
Norm        : 1.00941       (-0.140497     0.164382)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.41 using 59 PHA bins.
# Reduced chi-squared =         0.8669 for     57 degrees of freedom 
# Null hypothesis probability =   7.522022e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.498e-08   1.383e-08
25- 50  4.803e-08   2.651e-08
50-150  1.052e-07   5.761e-08
15-150  1.782e-07   9.957e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.12294        (-2.08448      3.1771)
R1^2/D10^2  : 0.834020        (-0.675746      8.04831)
kT2 [keV]   : 22.3926        (-6.23152      17.0074)
R2^2/D10^2  : 5.71420E-03    (-0.00486592   0.0129414)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.32 using 59 PHA bins.
# Reduced chi-squared =         0.8967 for     55 degrees of freedom 
# Null hypothesis probability =   6.906292e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.740e-08   1.497e-08
25- 50  4.328e-08   2.094e-08
50-150  1.053e-07   6.127e-08
15-150  1.760e-07   9.296e-08
Peak spectrum fit
Power-law model
 
Time interval is from    2.116 sec. to    3.116 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.979470     ( -0.563136   0.506402 )
Norm@50keV  : 3.31094E-03    ( -0.000933966   0.000904442 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.82 using 59 PHA bins.
# Reduced chi-squared =         0.9969 for     57 degrees of freedom 
# Null hypothesis probability =   4.817309e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.380909 ( -0.106812  0.107574 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.6061e-08 ( -1.03453e-08  1.04801e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from    2.116 sec. to    3.116 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.75459     (     )
Epeak [keV] : 221.838      (   )
Norm@50keV  : 3.55605E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.19 using 59 PHA bins.
# Reduced chi-squared =          1.003 for     56 degrees of freedom 
# Null hypothesis probability =   4.678955e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.380700 ( -0.107005  0.107582 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.59575e-08 ( -1.03944e-08  1.05291e-08 ) ergs/cm2
 
Band function
 
Time interval is from    2.116 sec. to    3.116 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.875357   ( 0.875339   0.875339 )
beta        : -0.979496    ( -0.507299   0.563217 )
Epeak [keV] : 20.4007      ( -20.3455 -20.3455 )
Norm@50keV   : 5.16821E-03    ( -0.00274381   0.567752 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.82 using 59 PHA bins.
# Reduced chi-squared =          1.033 for     55 degrees of freedom 
# Null hypothesis probability =   4.069973e-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]    : 22.8116  (-6.77068  13.8006)
R^2/D10^2   : 1.20380E-02  (-0.012038   0.0254979)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.97 using 59 PHA bins.
# Reduced chi-squared =          1.035 for     57 degrees of freedom 
# Null hypothesis probability =   4.033946e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.140e-09   7.380e-10
25- 50  6.155e-09   3.703e-09
50-150  2.393e-08   1.520e-08
15-150  3.122e-08   1.725e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 1.57534       (-0.441807     0.441774)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.68 using 59 PHA bins.
# Reduced chi-squared =          1.064 for     57 degrees of freedom 
# Null hypothesis probability =   3.448548e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.925e-09   2.411e-09
25- 50  7.551e-09   4.639e-09
50-150  1.656e-08   1.006e-08
15-150  2.803e-08   1.695e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 1.84048        (-1.38997      2.20905)
R1^2/D10^2  : 478.337        (-425.202      8147.81)
kT2 [keV]   : 25.6924        (-8.06399      19.4224)
R2^2/D10^2  : 8.04386E-03    (-0.00635556   0.0169479)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.48 using 59 PHA bins.
# Reduced chi-squared =         0.9723 for     55 degrees of freedom 
# Null hypothesis probability =   5.329828e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.969e-09   1.302e-09
25- 50  5.264e-09   3.103e-09
50-150  2.548e-08   1.562e-08
15-150  3.371e-08   1.915e-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: 1.56987     ( -0.254157   0.263145 )
Norm@50keV  : 1.95225E-03    ( -0.000301761   0.000294819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.05 using 59 PHA bins.
# Reduced chi-squared =         0.8606 for     57 degrees of freedom 
# Null hypothesis probability =   7.638575e-01
 
Photon flux (15-150 keV)    in 9.932 sec: 0.248589 ( -0.0346267  0.0346418 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.82036e-07 ( -3.04892e-08  3.1195e-08 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.56781     ( -0.911164   0.350472 )
Epeak [keV] : 9995.67      (   )
Norm@50keV  : 1.95729E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.05 using 59 PHA bins.
# Reduced chi-squared =         0.8760 for     56 degrees of freedom 
# Null hypothesis probability =   7.330188e-01
 
Photon flux (15-150 keV)    in 9.932 sec: 0.248520 ( -0.035184  0.034606 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.82074e-07 ( -3.36278e-08  3.09243e-08 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.34234   ( 1.34234   1.34234 )
beta        : -1.56987    ( 1.56987   0.254227 )
Epeak [keV] : 30.7682      ( -30.7682 -30.7682 )
Norm@50keV   : 3.48506E-03    ( -0.00180577   0.0773766 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.05 using 59 PHA bins.
# Reduced chi-squared =         0.8919 for     55 degrees of freedom 
# Null hypothesis probability =   7.000853e-01
 
Photon flux (15-150 keV)    in 9.932 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)  = 4.65e-08
S(50-100 keV) = 6.27e-08
 T90 vs. Hardness ratio plot 
 
T90                                   = 9.26799994707108 sec.
Hardness ratio (energy fluence ratio) = 1.34839
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.08995
Count Ratio (50-100 keV) / (15-25 keV) = 0.932094
 Mask shadow pattern 
 
IMX = 1.192961137551998E-01, IMY = 9.098437706870487E-03
 TIME vs. PHA plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
 TIME vs. DetID plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
 100 us light curve (15-350 keV)
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
 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:
-239.120000 -3.028000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
264.8028 -44.4388    7.1  54.1  168.9  -1.2444  -1.6    2.7	4U 1735-44                    
255.6870 -48.8281    1.9  52.2  159.7   4.4574   5.9 ------	UNKNOWN                       
310.3118 -30.1882    2.4  54.0 -143.3   5.6476   4.8 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-3.028000 6.904000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
264.6211 -44.5714    4.3  54.1  168.7  -0.3890  -2.7    9.0	4U 1735-44                    
111.9779 -49.4695    2.3  45.4   48.5   0.6589   5.1 ------	UNKNOWN                       
164.4811 -70.7454    2.1  35.8   96.5   0.4040   5.5 ------	UNKNOWN                       
 32.3186 -67.9914    1.0   6.8   -4.4   0.3437  12.1 ------	UNKNOWN                       
 59.2283 -36.4748    2.5  41.7  -10.5   0.1977   4.6 ------	UNKNOWN                       
 47.5823 -42.3193    2.6  33.4  -21.7   0.1500   4.4 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
62.380610 902.901200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
165.0684 -68.2340    2.6  39.9  103.9   6.9342   4.4 ------	UNKNOWN                       
115.7255 -59.7060    3.2  34.7   67.3   3.4829   3.7 ------	UNKNOWN                       
 63.3972 -38.7037    2.5  33.9   -4.7   2.7878   4.7 ------	UNKNOWN                       
 28.5788 -53.8672    2.8  14.2  -60.0   1.8325   4.1 ------	UNKNOWN                       
337.7058 -45.7524    3.3  35.4 -130.4   2.6511   3.5 ------	UNKNOWN                       
357.3838 -42.6524    2.9  31.3 -105.1   2.8968   4.0 ------	UNKNOWN                       
Plot creation:
Sun May 31 01:57:47 EDT 2015