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
  188.1014   -60.2748   0.0051    31.6241   -66.3882         3.4022921     37.639 TRIG_00316910                 
 
Foreground time interval of the image:
 -3.812  14.117 (delta_t =  17.929 [sec])
Background time interval of the image:
-239.584  -3.812 (delta_t = 235.772 [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)
 
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   -3.812 sec. to   32.212 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.43978     ( -0.0769673   0.077068 )
Norm@50keV  : 7.37970E-03    ( -0.00030614   0.00030601 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.95 using 59 PHA bins.
# Reduced chi-squared =          1.017 for     57 degrees of freedom 
# Null hypothesis probability =   4.398941e-01
 
Photon flux (15-150 keV)    in 36.02 sec: 0.907163 ( -0.0400399  0.0401429 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.54852e-06 ( -1.14401e-07  1.14731e-07 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -3.812 sec. to   32.212 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.26608     ( -0.313525   0.210551 )
Epeak [keV] : 229.154      ( -229.154 -229.154 )
Norm@50keV  : 8.89504E-03    ( -0.00173378   0.00345242 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.96 using 59 PHA bins.
# Reduced chi-squared =          1.017 for     56 degrees of freedom 
# Null hypothesis probability =   4.392302e-01
 
Photon flux (15-150 keV)    in 36.02 sec: 0.897119 ( -0.04321  0.04335 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.52083e-06 ( -1.25306e-07  1.2464e-07 ) ergs/cm2
 
Band function
 
Time interval is from   -3.812 sec. to   32.212 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.26616   ( 1.01725   1.01725 )
beta        : -9.78548    ( 3.64452   13.6445 )
Epeak [keV] : 229.203      ( -229.202 -229.202 )
Norm@50keV   : 8.89302E-03    ( -0.000367619   0.001908 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.96 using 59 PHA bins.
# Reduced chi-squared =          1.036 for     55 degrees of freedom 
# Null hypothesis probability =   4.021098e-01
 
Photon flux (15-150 keV)    in 36.02 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]    : 16.9405  (  )
R^2/D10^2   : 6.68182E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         176.98 using 59 PHA bins.
# Reduced chi-squared =         3.1049 for     57 degrees of freedom 
# Null hypothesis probability =   3.227283e-14
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.408e-07   1.176e-08
25- 50  6.212e-07   3.404e-08
50-150  1.272e-06   1.041e-07
15-150  2.034e-06   1.003e-07
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 3.74877       (-0.155444     0.155423)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.03 using 59 PHA bins.
# Reduced chi-squared =          1.158 for     57 degrees of freedom 
# Null hypothesis probability =   1.931970e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.363e-07   1.534e-08
25- 50  6.470e-07   2.846e-08
50-150  1.419e-06   6.826e-08
15-150  2.402e-06   1.183e-07
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.84955        (-1.17879      1.36748)
R1^2/D10^2  : 0.915660        (-0.414967      0.907568)
kT2 [keV]   : 26.5676        (-3.31874      5.06351)
R2^2/D10^2  : 1.18744E-02    (-0.00549816   0.00749484)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.24 using 59 PHA bins.
# Reduced chi-squared =          1.132 for     55 degrees of freedom 
# Null hypothesis probability =   2.342485e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.936e-07   5.549e-08
25- 50  6.154e-07   7.024e-08
50-150  1.584e-06   2.244e-07
15-150  2.493e-06   2.766e-07
Peak spectrum fit
Power-law model
 
Time interval is from   -0.344 sec. to    0.656 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.10877     ( -0.115813   0.114584 )
Norm@50keV  : 3.60351E-02    ( -0.00236084   0.00235861 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.71 using 59 PHA bins.
# Reduced chi-squared =         0.9599 for     57 degrees of freedom 
# Null hypothesis probability =   5.613719e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.18345 ( -0.281957  0.282407 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.75708e-07 ( -2.70532e-08  2.71816e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -0.344 sec. to    0.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.10367     ( -0.384023   0.172806 )
Epeak [keV] : 9998.20      (   )
Norm@50keV  : 3.62301E-02    ( -0.00236366   0.0205755 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.71 using 59 PHA bins.
# Reduced chi-squared =         0.9770 for     56 degrees of freedom 
# Null hypothesis probability =   5.238146e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.18235 ( -0.29061  0.28138 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.7502e-07 ( -2.7486e-08  2.7984e-08 ) ergs/cm2
 
Band function
 
Time interval is from   -0.344 sec. to    0.656 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 3.76019   ( -3.75991   -3.75991 )
beta        : -1.14543    ( -0.128511   0.126093 )
Epeak [keV] : 26.6532      ( -26.6358 129.443 )
Norm@50keV   : 237.258    ( -237.888   6680.98 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.83 using 59 PHA bins.
# Reduced chi-squared =         0.9786 for     55 degrees of freedom 
# Null hypothesis probability =   5.195765e-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]    : 21.0196  (-1.96685  2.24223)
R^2/D10^2   : 0.167246  (-0.0460937   0.0621642)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         110.93 using 59 PHA bins.
# Reduced chi-squared =         1.9461 for     57 degrees of freedom 
# Null hypothesis probability =   2.501260e-05
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.395e-08   1.945e-09
25- 50  7.177e-08   7.825e-09
50-150  2.364e-07   2.595e-08
15-150  3.221e-07   2.910e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 17.1762       (-1.15925     1.15914)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          96.14 using 59 PHA bins.
# Reduced chi-squared =          1.687 for     57 degrees of freedom 
# Null hypothesis probability =   9.162639e-04
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.278e-08   3.385e-09
25- 50  8.229e-08   8.900e-09
50-150  1.805e-07   4.890e-08
15-150  3.055e-07   5.230e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.38967        (-1.72633      1.99742)
R1^2/D10^2  : 1.98314        (-0.951946      2.21913)
kT2 [keV]   : 38.5722        (-7.97051      15.838)
R2^2/D10^2  : 2.12919E-02    (-0.0131385   0.0225927)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.63 using 59 PHA bins.
# Reduced chi-squared =         0.9568 for     55 degrees of freedom 
# Null hypothesis probability =   5.658938e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.028e-08   8.945e-09
25- 50  7.781e-08   1.779e-08
50-150  2.736e-07   9.315e-08
15-150  3.817e-07   1.087e-07
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: 1.39136     ( -0.069236   0.069217 )
Norm@50keV  : 1.28109E-02    ( -0.000478851   0.000478832 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.13 using 59 PHA bins.
# Reduced chi-squared =         0.9672 for     57 degrees of freedom 
# Null hypothesis probability =   5.455258e-01
 
Photon flux (15-150 keV)    in 17.93 sec: 1.55710 ( -0.0623506  0.0624977 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.22348e-06 ( -8.9666e-08  8.98709e-08 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.19391     ( -0.280291   0.226075 )
Epeak [keV] : 225.538      (   )
Norm@50keV  : 1.57838E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.52 using 59 PHA bins.
# Reduced chi-squared =         0.9558 for     56 degrees of freedom 
# Null hypothesis probability =   5.692174e-01
 
Photon flux (15-150 keV)    in 17.93 sec: 1.53768 ( -0.06713  0.06735 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.19802e-06 ( -9.71268e-08  9.66786e-08 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.19399   ( 0.943532   0.943532 )
beta        : -9.74028    ( 9.74028   19.7403 )
Epeak [keV] : 225.575      ( -205.396 -225.575 )
Norm@50keV   : 1.57806E-02    ( -0.00325805   0.00526464 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.52 using 59 PHA bins.
# Reduced chi-squared =         0.9731 for     55 degrees of freedom 
# Null hypothesis probability =   5.312514e-01
 
Photon flux (15-150 keV)    in 17.93 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)  = 6.12e-07
S(50-100 keV) = 9.02e-07
 T90 vs. Hardness ratio plot 
 
T90                                   = 25.8120000064373 sec.
Hardness ratio (energy fluence ratio) = 1.47386
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.39306
Count Ratio (50-100 keV) / (15-25 keV) = 1.18703
 Mask shadow pattern 
 
IMX = 2.466448305824361E-01, IMY = 5.642309913040295E-01
 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:
-239.584000 -3.812000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.6652 -60.6207    7.8  38.3  -75.8   1.0260   1.5   10.3	Cen X-3                       
186.5602 -62.6352  250.2  31.0  -71.0   0.0148   0.0    8.5	GX 301-2                      
244.9894 -15.6342    0.6  46.8   36.9  18.8057  20.1    0.7	Sco X-1                       
256.0042 -37.8490    1.2  23.9   51.2   2.3772   9.6    0.9	4U 1700-377                   
256.5692 -36.5144    3.0  25.2   52.3   1.0239   3.9    8.5	GX 349+2                      
263.1645 -24.7723    7.8  37.3   62.2   0.8661   1.5    8.6	GX 1+4                        
264.6318 -44.5598    5.3  17.8   71.4   0.4978   2.2    8.1	4U 1735-44                    
270.2039 -24.9667    5.9  37.9   72.6   1.3880   2.0    8.0	GX 5-1                        
270.4564 -25.7089    7.5  37.3   73.2   1.0007   1.5    8.6	GRS 1758-258                  
275.9870 -30.5503    0.0  33.7   83.3  -0.6321  -1.3   11.5	H1820-303                     
262.8904 -33.8327    7.6  28.2   63.4   0.4626   1.5    4.9	GX 354-0                      
218.8338 -31.1167    2.6  39.1   -3.9   1.2582   4.4 ------	UNKNOWN                       
220.3217 -34.0824    3.2  35.9   -4.4   0.9614   3.7 ------	UNKNOWN                       
194.1372 -36.3794    3.9  45.6  -34.0   1.3168   2.9 ------	UNKNOWN                       
182.5579 -36.8263    4.0  50.7  -44.5   3.6856   2.9 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-3.812000 14.116590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.0042 -60.5917   31.3  38.6  -76.1  -0.0612  -0.4    9.4	Cen X-3                       
186.2684 -62.8696    6.0  31.0  -71.5   0.1743   1.9   12.2	GX 301-2                      
245.2132 -15.6486    0.0  46.8   37.1  -0.0282  -0.2   13.5	Sco X-1                       
256.1660 -37.8977  258.8  23.9   51.5  -0.0028  -0.0    9.1	4U 1700-377                   
256.6571 -36.3715   18.9  25.4   52.4   0.0408   0.6   11.1	GX 349+2                      
262.9182 -24.6460    6.1  37.4   61.8  -0.2500  -1.9    7.8	GX 1+4                        
264.8422 -44.6073   28.5  17.8   71.9   0.0226   0.4   10.3	4U 1735-44                    
270.4395 -25.0834    8.3  37.9   73.0   0.2154   1.4    8.4	GX 5-1                        
270.4198 -25.7124   13.6  37.2   73.1  -0.1213  -0.8    6.6	GRS 1758-258                  
275.8234 -30.2590    6.6  33.9   82.9  -0.1903  -1.8    8.3	H1820-303                     
262.9256 -33.9049   11.4  28.2   63.5  -0.0725  -1.0    5.3	GX 354-0                      
291.4856 -77.0582    2.8  19.0 -151.1   0.2094   4.1 ------	UNKNOWN                       
188.1013 -60.2747    0.3  31.6  -66.4   3.4025  37.3 ------	UNKNOWN                       
 62.9163 -67.9480    2.5  49.9 -134.5   1.2040   4.5 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
68.916590 819.616600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.7384 -40.6398    0.0  37.3 -106.9   1.3190   1.0   10.8	Vela X-1                      
170.4711 -60.5334    2.9   8.7 -123.7   1.5978   4.0    7.1	Cen X-3                       
186.5749 -62.7416    2.3   2.6  172.1   2.3227   5.0    2.8	GX 301-2                      
201.4236 -43.0080    1.2  19.0    6.5   3.7776   9.3 ------	UNKNOWN                       
152.4309 -58.3121    1.3  18.1 -123.9   4.0670   8.8 ------	UNKNOWN                       
Plot creation:
Sun May 31 07:00:52 EDT 2015