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
   17.8853   -76.0444   0.0224    27.3669  -170.2244         0.4767006      8.548 TRIG_00324744                 
 
Foreground time interval of the image:
 -2.672  26.720 (delta_t =  29.392 [sec])
Background time interval of the image:
-239.056  -2.672 (delta_t = 236.384 [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   -2.672 sec. to   26.720 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.58218     ( -0.306052   0.311857 )
Norm@50keV  : 1.05660E-03    ( -0.000202089   0.000198044 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.62 using 59 PHA bins.
# Reduced chi-squared =         0.9231 for     57 degrees of freedom 
# Null hypothesis probability =   6.400448e-01
 
Photon flux (15-150 keV)    in 29.39 sec: 0.135039 ( -0.0236994  0.0237145 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.91072e-07 ( -5.93446e-08  6.10768e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -2.672 sec. to   26.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.26818     ( -2.40219   0.602578 )
Epeak [keV] : 98.5862      ( -103.225 -103.225 )
Norm@50keV  : 1.60551E-03    ( -0.00155061   0.0436275 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.50 using 59 PHA bins.
# Reduced chi-squared =         0.9376 for     56 degrees of freedom 
# Null hypothesis probability =   6.079573e-01
 
Photon flux (15-150 keV)    in 29.39 sec: 0.133512 ( -0.013055  0.024684 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.79915e-07 ( -8.72263e-08  7.04755e-08 ) ergs/cm2
 
Band function
 
Time interval is from   -2.672 sec. to   26.720 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.64979   ( -5.96529   -4.64979 )
beta        : -1.92558    ( -0.561322   0.43677 )
Epeak [keV] : 29.1711      ( -7.38847 7.3 )
Norm@50keV   : 29.3473    ( -5.03959   1219.43 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.74 using 59 PHA bins.
# Reduced chi-squared =         0.9044 for     55 degrees of freedom 
# Null hypothesis probability =   6.751827e-01
 
Photon flux (15-150 keV)    in 29.39 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]    : 10.9709  (-1.92473  2.58567)
R^2/D10^2   : 4.65623E-02  (-0.0253977   0.0487601)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.01 using 59 PHA bins.
# Reduced chi-squared =         0.9827 for     57 degrees of freedom 
# Null hypothesis probability =   5.121887e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.440e-08   1.340e-08
25- 50  9.693e-08   2.685e-08
50-150  6.577e-08   2.893e-08
15-150  1.971e-07   5.940e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 159.740       (-89.1221      -161.198)
Norm        : 0.556295       (-0.102427     0.138996)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.43 using 59 PHA bins.
# Reduced chi-squared =         0.9199 for     57 degrees of freedom 
# Null hypothesis probability =   6.467737e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.175e-08   2.347e-08
25- 50  7.809e-08   4.295e-08
50-150  1.581e-07   9.449e-08
15-150  2.779e-07   1.546e-07
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 9.11759        (-1.58656      1.85589)
R1^2/D10^2  : 8.22439E-02        (-0.0426355      0.0882885)
kT2 [keV]   : 198.619        (-130.776      -198.744)
R2^2/D10^2  : 1.73220E-05    (-8.53431e-06   0.000628721)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.34 using 59 PHA bins.
# Reduced chi-squared =         0.8426 for     55 degrees of freedom 
# Null hypothesis probability =   7.907076e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.003e-08   1.881e-08
25- 50  9.092e-08   4.636e-08
50-150  1.680e-07   3.743e-08
15-150  2.990e-07   1.061e-07
Peak spectrum fit
Power-law model
 
Time interval is from    3.044 sec. to    4.044 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.48762     ( -0.539899   0.566544 )
Norm@50keV  : 3.71588E-03    ( -0.00112055   0.00106972 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.67 using 59 PHA bins.
# Reduced chi-squared =         0.9766 for     57 degrees of freedom 
# Null hypothesis probability =   5.252393e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.462360 ( -0.128798  0.129268 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.53232e-08 ( -1.14538e-08  1.18476e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from    3.044 sec. to    4.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.05480     (     )
Epeak [keV] : 21.2741      (   )
Norm@50keV  : 1.72992E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.10 using 59 PHA bins.
# Reduced chi-squared =         0.9839 for     56 degrees of freedom 
# Null hypothesis probability =   5.089090e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.463271 ( -0.130233  0.128239 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.5411e-08 ( -1.1642e-08  1.15994e-08 ) ergs/cm2
 
Band function
 
Time interval is from    3.044 sec. to    4.044 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.21214   ( 1.21214   1.21214 )
beta        : -1.48755    ( 1.48758   0.540262 )
Epeak [keV] : 32.0157      ( -31.9954 -31.9954 )
Norm@50keV   : 7.39119E-03    ( -0.00469876   0.188157 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.67 using 59 PHA bins.
# Reduced chi-squared =          1.012 for     55 degrees of freedom 
# Null hypothesis probability =   4.495458e-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]    : 16.0294  (-5.53182  9.51608)
R^2/D10^2   : 4.03843E-02  (-0.0401286   0.133891)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.44 using 59 PHA bins.
# Reduced chi-squared =          1.060 for     57 degrees of freedom 
# Null hypothesis probability =   3.525448e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.145e-09   1.355e-09
25- 50  9.039e-09   5.440e-09
50-150  1.624e-08   1.075e-08
15-150  2.743e-08   1.753e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.361       (-199.363      -199.363)
Norm        : 1.88028       (-0.520884     0.521399)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.05 using 59 PHA bins.
# Reduced chi-squared =         0.9833 for     57 degrees of freedom 
# Null hypothesis probability =   5.108815e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.682e-09   2.879e-09
25- 50  9.007e-09   5.525e-09
50-150  1.975e-08   1.201e-08
15-150  3.344e-08   2.030e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 2.77950        (-1.59156      4.92705)
R1^2/D10^2  : 33.5684        (-33.4239      36003.1)
kT2 [keV]   : 21.0712        (-7.69956      54.1119)
R2^2/D10^2  : 1.48760E-02    (-0.0125664   0.0547703)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.81 using 59 PHA bins.
# Reduced chi-squared =         0.9965 for     55 degrees of freedom 
# Null hypothesis probability =   4.820331e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.090e-09   2.843e-09
25- 50  6.844e-09   4.059e-09
50-150  2.125e-08   1.292e-08
15-150  3.318e-08   1.907e-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: 1.58218     ( -0.306052   0.311857 )
Norm@50keV  : 1.05660E-03    ( -0.000202089   0.000198044 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.62 using 59 PHA bins.
# Reduced chi-squared =         0.9231 for     57 degrees of freedom 
# Null hypothesis probability =   6.400448e-01
 
Photon flux (15-150 keV)    in 29.39 sec: 0.135039 ( -0.0236994  0.0237145 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.91072e-07 ( -5.93446e-08  6.10768e-08 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.26818     ( -2.40219   0.602578 )
Epeak [keV] : 98.5862      ( -103.225 -103.225 )
Norm@50keV  : 1.60551E-03    ( -0.00155061   0.0436275 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.50 using 59 PHA bins.
# Reduced chi-squared =         0.9376 for     56 degrees of freedom 
# Null hypothesis probability =   6.079573e-01
 
Photon flux (15-150 keV)    in 29.39 sec: 0.133512 ( -0.013055  0.024684 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.79915e-07 ( -8.72263e-08  7.04755e-08 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.64979   ( -13.2207   -4.64979 )
beta        : -1.92558    ( -0.561322   0.43677 )
Epeak [keV] : 29.1711      ( -7.38847 7.3 )
Norm@50keV   : 29.3473    ( -5.03959   1219.43 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.74 using 59 PHA bins.
# Reduced chi-squared =         0.9044 for     55 degrees of freedom 
# Null hypothesis probability =   6.751827e-01
 
Photon flux (15-150 keV)    in 29.39 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)  = 7.48e-08
S(50-100 keV) = 1.00e-07
 T90 vs. Hardness ratio plot 
 
T90                                   = 26.2879999577999 sec.
Hardness ratio (energy fluence ratio) = 1.3369
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.36843
Count Ratio (50-100 keV) / (15-25 keV) = 0.663231
 Mask shadow pattern 
 
IMX = -5.101016289983309E-01, IMY = 8.788627582560590E-02
 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:
-239.056000 -2.672000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
256.0552 -37.8700    5.8  37.0  -29.5   0.5644   2.0    3.6	4U 1700-377                   
256.4260 -36.4160   26.7  38.0  -27.8   0.1273   0.4    0.6	GX 349+2                      
263.1257 -24.7301    4.3  45.7  -11.9   0.9522   2.7    6.4	GX 1+4                        
264.6800 -44.3862    6.0  27.9  -26.4   0.3978   1.9    4.7	4U 1735-44                    
270.3978 -25.0392    5.2  42.9   -3.3   0.7618   2.2    6.6	GX 5-1                        
270.2549 -25.6356    3.9  42.4   -3.8   0.9489   2.9    6.9	GRS 1758-258                  
273.9867 -14.0274   12.5  52.4    5.6   0.5683   0.9    1.2	GX 17+2                       
275.9099 -30.3855    4.3  36.2    1.0   0.7152   2.7    1.4	H1820-303                     
284.9284 -24.8028    9.1  39.4   16.0  -0.4066  -1.3    9.2	HT1900.1-2455                 
262.9855 -33.8376    2.2  37.6  -18.1   1.3515   5.3    0.3	GX 354-0                      
292.1667 -18.6176    2.7  44.5   27.4   2.0414   4.2 ------	UNKNOWN                       
281.0967 -12.1761    2.0  52.5   14.7   4.6759   5.9 ------	UNKNOWN                       
273.2337 -10.0276    2.5  56.4    6.1   5.4369   4.6 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-2.672000 26.720000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
256.0197 -37.7130    4.7  37.1  -29.3   0.1892   2.5    8.0	4U 1700-377                   
256.4524 -36.4558   15.0  38.0  -27.8   0.0628   0.8    2.1	GX 349+2                      
262.9011 -24.8311    7.6  45.7  -12.2  -0.1439  -1.5    7.8	GX 1+4                        
264.8858 -44.2766    4.1  27.9  -26.0  -0.1717  -2.8   12.1	4U 1735-44                    
270.1353 -24.9905    6.6  43.1   -3.6  -0.1564  -1.7    9.7	GX 5-1                        
270.3931 -25.6236   13.2  42.4   -3.6  -0.0755  -0.9    8.7	GRS 1758-258                  
273.8806 -13.9932    7.7  52.4    5.5   0.2810   1.5    7.7	GX 17+2                       
276.0659 -30.3460    7.8  36.2    1.2  -0.1066  -1.5    7.4	H1820-303                     
285.0963 -24.7853   18.3  39.4   16.3   0.0556   0.6    8.8	HT1900.1-2455                 
262.9986 -33.6872    4.1  37.7  -17.9  -0.2082  -2.8    8.9	GX 354-0                      
341.0981 -31.8111    2.4  39.6   98.1   1.0078   4.9 ------	UNKNOWN                       
 17.8850 -76.0444    1.3  27.4 -170.2   0.4774   8.6 ------	UNKNOWN                       
215.8261 -55.8768    1.9  41.1  -81.3   1.2473   6.1 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
 
Plot creation:
Sun May 31 06:26:32 EDT 2015