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
  350.6075   -66.2317   0.0071    48.8628  -154.3548         3.4436743     26.947 TRIG_00424031                 
 
Foreground time interval of the image:
 -0.260  15.221 (delta_t =  15.481 [sec])
Background time interval of the image:
-389.179 -346.667 (delta_t =  42.512 [sec])
-239.680  -0.260 (delta_t = 239.420 [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   -0.260 sec. to   82.928 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.16005     ( -0.0728539   0.0720535 )
Norm@50keV  : 6.58150E-03    ( -0.000258326   0.000257186 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.87 using 59 PHA bins.
# Reduced chi-squared =         0.7170 for     57 degrees of freedom 
# Null hypothesis probability =   9.472247e-01
 
Photon flux (15-150 keV)    in 83.19 sec: 0.768471 ( -0.0324109  0.0325793 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.61943e-06 ( -2.22687e-07  2.23066e-07 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -0.260 sec. to   82.928 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.15450     ( -0.135104   0.073082 )
Epeak [keV] : 9997.57      ( -9998.25 -9998.25 )
Norm@50keV  : 6.61376E-03    ( -0.000254658   0.00130885 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.91 using 59 PHA bins.
# Reduced chi-squared =         0.7305 for     56 degrees of freedom 
# Null hypothesis probability =   9.350262e-01
 
Photon flux (15-150 keV)    in 83.19 sec: 0.768818 ( -0.033101  0.031887 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.62021e-06 ( -2.22126e-07  2.20603e-07 ) ergs/cm2
 
Band function
 
Time interval is from   -0.260 sec. to   82.928 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.542039   ( 0.77524   0.77524 )
beta        : -1.17286    ( -0.0461031   0.0807865 )
Epeak [keV] : 66.5097      ( -66.5699 227.537 )
Norm@50keV   : 1.76091E-02    ( -0.0180964   345478 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.58 using 59 PHA bins.
# Reduced chi-squared =         0.7378 for     55 degrees of freedom 
# Null hypothesis probability =   9.268577e-01
 
Photon flux (15-150 keV)    in 83.19 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]    : 22.0241  (  )
R^2/D10^2   : 2.53726E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         191.50 using 59 PHA bins.
# Reduced chi-squared =         3.3596 for     57 degrees of freedom 
# Null hypothesis probability =   1.921873e-16
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.894e-07   1.581e-08
25- 50  1.002e-06   6.156e-08
50-150  3.632e-06   2.238e-07
15-150  4.823e-06   2.234e-07
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 3.31645       (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         139.15 using 59 PHA bins.
# Reduced chi-squared =         2.4413 for     57 degrees of freedom 
# Null hypothesis probability =   8.030326e-09
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.870e-07   3.011e-08
25- 50  1.322e-06   5.865e-08
50-150  2.898e-06   1.256e-07
15-150  4.907e-06   2.163e-07
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.12117        (-1.08196      1.24627)
R1^2/D10^2  : 0.414813        (-0.154732      0.263945)
kT2 [keV]   : 37.0721        (-4.82719      7.36477)
R2^2/D10^2  : 4.25593E-03    (-0.00176871   0.00234492)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.69 using 59 PHA bins.
# Reduced chi-squared =         0.7217 for     55 degrees of freedom 
# Null hypothesis probability =   9.402573e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.823e-07   6.755e-08
25- 50  1.189e-06   1.314e-07
50-150  4.035e-06   4.904e-07
15-150  5.706e-06   5.536e-07
Peak spectrum fit
Power-law model
 
Time interval is from    0.196 sec. to    1.196 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.922682     ( -0.21325   0.204126 )
Norm@50keV  : 3.28031E-02    ( -0.00407432   0.00401251 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.21 using 59 PHA bins.
# Reduced chi-squared =         0.9335 for     57 degrees of freedom 
# Null hypothesis probability =   6.180511e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.76619 ( -0.467333  0.470335 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.64941e-07 ( -4.35747e-08  4.36668e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from    0.196 sec. to    1.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.591071     ( -0.984122   0.428282 )
Epeak [keV] : 265.401      ( -265.4 -265.4 )
Norm@50keV  : 4.47793E-02    ( -0.0153211   0.0621508 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.75 using 59 PHA bins.
# Reduced chi-squared =         0.9420 for     56 degrees of freedom 
# Null hypothesis probability =   5.985717e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.71317 ( -0.48469  0.48785 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.62258e-07 ( -4.5054e-08  4.4572e-08 ) ergs/cm2
 
Band function
 
Time interval is from    0.196 sec. to    1.196 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.769101   ( 0.77313   0.77313 )
beta        : -9.37164    ( -0.20398   0.213887 )
Epeak [keV] : 523.277      ( -46.8072 -46.8072 )
Norm@50keV   : 3.76112E-02    ( -0.00431907   0.0188834 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.89 using 59 PHA bins.
# Reduced chi-squared =         0.9617 for     55 degrees of freedom 
# Null hypothesis probability =   5.556325e-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]    : 24.9601  (-3.64648  4.70021)
R^2/D10^2   : 9.35220E-02  (-0.038423   0.0600668)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.22 using 59 PHA bins.
# Reduced chi-squared =          1.074 for     57 degrees of freedom 
# Null hypothesis probability =   3.272036e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.013e-08   2.519e-09
25- 50  5.742e-08   1.293e-08
50-150  2.653e-07   4.835e-08
15-150  3.329e-07   5.630e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 15.8836       (-1.95078     1.95046)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          79.68 using 59 PHA bins.
# Reduced chi-squared =          1.398 for     57 degrees of freedom 
# Null hypothesis probability =   2.531500e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.957e-08   2.234e-08
25- 50  7.611e-08   4.248e-08
50-150  1.669e-07   9.180e-08
15-150  2.826e-07   1.564e-07
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.60321        (-4.85452      10.6658)
R1^2/D10^2  : 1.13623        (-0.973732      23.317)
kT2 [keV]   : 34.6306        (-9.52412      -34.6878)
R2^2/D10^2  : 3.03926E-02    (-0.0283582   0.0568217)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.27 using 59 PHA bins.
# Reduced chi-squared =         0.9686 for     55 degrees of freedom 
# Null hypothesis probability =   5.408378e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.117e-08   1.246e-08
25- 50  6.544e-08   3.490e-08
50-150  2.780e-07   1.538e-07
15-150  3.646e-07   1.734e-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: 0.965657     ( -0.10464   0.102179 )
Norm@50keV  : 1.50997E-02    ( -0.000900627   0.000892225 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.90 using 59 PHA bins.
# Reduced chi-squared =         0.6824 for     57 degrees of freedom 
# Null hypothesis probability =   9.681219e-01
 
Photon flux (15-150 keV)    in 15.48 sec: 1.73577 ( -0.105664  0.106138 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.55903e-06 ( -1.43033e-07  1.43153e-07 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.959030     ( -0.45213   0.154174 )
Epeak [keV] : 9999.99      (   )
Norm@50keV  : 1.51923E-02    ( -0.000902557   0.000823408 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.88 using 59 PHA bins.
# Reduced chi-squared =         0.6943 for     56 degrees of freedom 
# Null hypothesis probability =   9.603673e-01
 
Photon flux (15-150 keV)    in 15.48 sec: 1.73824 ( -0.1205  0.10376 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.54686e-06 ( -1.4028e-07  1.59599e-07 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 5.00000   ( -4.99997   -4.99997 )
beta        : -0.976600    ( -0.106103   0.107544 )
Epeak [keV] : 23.9594      ( -23.9594 8.51575 )
Norm@50keV   : 1248.93    ( -67.6835   2.39268e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.69 using 59 PHA bins.
# Reduced chi-squared =         0.7034 for     55 degrees of freedom 
# Null hypothesis probability =   9.532791e-01
 
Photon flux (15-150 keV)    in 15.48 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)  = 1.15e-06
S(50-100 keV) = 2.06e-06
 T90 vs. Hardness ratio plot 
 
T90                                   = 67.3839999437332 sec.
Hardness ratio (energy fluence ratio) = 1.7913
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.80592
Count Ratio (50-100 keV) / (15-25 keV) = 1.85299
 Mask shadow pattern 
 
IMX = -1.032044984119505E+00, IMY = 4.954754069573491E-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:
-389.179400 -346.667400
-239.680000 -0.260000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.1151 -60.6945    3.1  30.1  -69.1   1.3945   3.8    7.3	Cen X-3                       
186.6569 -62.7754    0.4  22.0  -69.8   8.2644  25.8    0.3	GX 301-2                      
256.1796 -37.8048    5.7  25.8  105.9  -0.7265  -2.0    9.4	4U 1700-377                   
256.3917 -36.5685    5.2  27.0  104.7   0.8723   2.2    9.0	GX 349+2                      
263.0190 -24.7435  114.2  40.1  103.1   0.0944   0.1    0.6	GX 1+4                        
264.9561 -44.3652   56.2  25.1  127.6  -0.0643  -0.2   10.5	4U 1735-44                    
275.9975 -30.4305    4.3  41.3  122.8   2.5072   2.7    5.3	H1820-303                     
263.0451 -33.6948   60.5  32.3  110.8   0.0890   0.2    8.8	GX 354-0                      
210.6008 -21.3401    2.5  38.6   23.2   1.7728   4.7 ------	UNKNOWN                       
214.2049 -55.7542    2.7   8.9  -34.6   0.9730   4.3 ------	UNKNOWN                       
330.2403 -57.0141    2.2  49.3 -171.9   2.9368   5.4 ------	UNKNOWN                       
183.4576 -25.9253    2.7  45.4  -13.6   1.8649   4.3 ------	UNKNOWN                       
160.1124 -42.9210    3.2  44.9  -49.9   3.1376   3.6 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-0.260000 15.220620
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.1510 -60.4951    6.1  30.1  -68.8  -0.1422  -1.9    9.1	Cen X-3                       
186.7273 -62.7378    2.7  22.0  -69.7   0.2715   4.3    2.8	GX 301-2                      
256.0883 -38.0289    5.1  25.6  106.0   0.1534   2.2   12.1	4U 1700-377                   
256.3733 -36.3399  360.3  27.2  104.4   0.0023   0.0    5.8	GX 349+2                      
263.0475 -24.7807    9.9  40.1  103.2   0.2243   1.2    3.0	GX 1+4                        
264.5854 -44.2866    5.5  24.9  127.0  -0.1343  -2.1   11.9	4U 1735-44                    
275.8381 -30.2591    8.8  41.4  122.4   0.2397   1.3    7.9	H1820-303                     
263.1513 -33.8161   19.2  32.3  111.1   0.0562   0.6    8.2	GX 354-0                      
260.1869 -23.7230    2.6  39.8   98.8   0.8099   4.4 ------	UNKNOWN                       
248.8520 -25.4949    2.3  34.4   84.0   0.5085   5.1 ------	UNKNOWN                       
350.6075 -66.2317    0.4  48.9 -154.4   3.4431  26.9 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
84.820670 962.367600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2902 -60.6720    7.9  53.1   14.8   2.9635   1.5    3.0	Cen X-3                       
186.6431 -62.7741    1.0  50.4   24.4  21.2712  11.4    0.4	GX 301-2                      
203.1134 -64.5153    2.4  47.1   33.3   7.4560   4.8 ------	UNKNOWN                       
295.9377 -74.3354    2.9  19.2   57.0   1.5717   4.0 ------	UNKNOWN                       
332.2730 -15.8962    3.1  51.8  172.3   4.9695   3.7 ------	UNKNOWN                       
Plot creation:
Mon Jun 15 00:15:04 EDT 2015