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
  128.6328   -59.1609   0.0106    34.4690   -71.9309         2.7005786     18.205 TRIG_00617110                 
 
Foreground time interval of the image:
-18.424  28.277 (delta_t =  46.701 [sec])
Background time interval of the image:
-524.123 -507.849 (delta_t =  16.275 [sec])
-239.424 -18.424 (delta_t = 221.000 [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 2.048000
 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 2.048000
 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 2.048000
 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
 
Multiple GTIs in the spectrum
tstart tstop
-18.424000 839.295900
840.576000 893.576000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.29583     ( -0.184339   0.181508 )
Norm@50keV  : 3.82611E-04    ( -3.84356e-05   3.84352e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.40 using 59 PHA bins.
# Reduced chi-squared =         0.9894 for     57 degrees of freedom 
# Null hypothesis probability =   4.975976e-01
 
Photon flux (15-150 keV)    in 910.7 sec: 4.56115E-02 ( -0.0048077  0.0048261 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.44676e-06 ( -3.78742e-07  3.81061e-07 ) ergs/cm2
 
Cutoff power-law model
 
Multiple GTIs in the spectrum
tstart tstop
-18.424000 839.295900
840.576000 893.576000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.29748     ( -0.588787   0.1792 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 3.83539E-04    ( -0.000383958   0.000319526 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.41 using 59 PHA bins.
# Reduced chi-squared =          1.007 for     56 degrees of freedom 
# Null hypothesis probability =   4.596311e-01
 
Photon flux (15-150 keV)    in 910.7 sec: 4.56277E-02 ( -0.004821  0.004757 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.44701e-06 ( -3.85417e-07  3.77813e-07 ) ergs/cm2
 
Band function
 
Multiple GTIs in the spectrum
tstart tstop
-18.424000 839.295900
840.576000 893.576000
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.980517   ( 0.985649   0.985649 )
beta        : -1.29816    ( 1.29792   0.186751 )
Epeak [keV] : 69.8630      ( -76.6264 -76.6264 )
Norm@50keV   : 6.85069E-04    ( -0.00029737   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.40 using 59 PHA bins.
# Reduced chi-squared =          1.026 for     55 degrees of freedom 
# Null hypothesis probability =   4.221907e-01
 
Photon flux (15-150 keV)    in 910.7 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]    : 19.4454  (-2.71674  3.28755)
R^2/D10^2   : 2.18026E-03  (-0.000875558   0.00143464)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          84.98 using 59 PHA bins.
# Reduced chi-squared =          1.491 for     57 degrees of freedom 
# Null hypothesis probability =   9.536929e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.463e-07   3.438e-08
25- 50  7.152e-07   1.365e-07
50-150  1.996e-06   3.775e-07
15-150  2.857e-06   4.253e-07
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 0.190334       (-0.0193732     0.0193712)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.22 using 59 PHA bins.
# Reduced chi-squared =          1.109 for     57 degrees of freedom 
# Null hypothesis probability =   2.660811e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.316e-07   9.125e-08
25- 50  8.302e-07   3.320e-07
50-150  1.821e-06   9.886e-07
15-150  3.083e-06   1.638e-06
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.41421        (-1.69017      2.16933)
R1^2/D10^2  : 6.05287E-02        (-0.0389915      0.140495)
kT2 [keV]   : 30.4060        (-6.49116      12.5936)
R2^2/D10^2  : 4.42114E-04    (-0.000288247   0.000538054)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.61 using 59 PHA bins.
# Reduced chi-squared =         0.9929 for     55 degrees of freedom 
# Null hypothesis probability =   4.894547e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.874e-07   1.884e-07
25- 50  7.371e-07   2.838e-07
50-150  2.372e-06   1.023e-06
15-150  3.497e-06   1.359e-06
Peak spectrum fit
Power-law model
 
Time interval is from    5.076 sec. to    6.076 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.39403     ( -0.847313   0.80681 )
Norm@50keV  : 5.02837E-03    ( -0.00203113   0.00201007 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.88 using 59 PHA bins.
# Reduced chi-squared =          1.016 for     57 degrees of freedom 
# Null hypothesis probability =   4.424453e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.611530 ( -0.256771  0.259242 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.86452e-08 ( -2.11049e-08  2.12506e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from    5.076 sec. to    6.076 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.39864     (     )
Epeak [keV] : 368.189      (   )
Norm@50keV  : 5.13691E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.74 using 59 PHA bins.
# Reduced chi-squared =          1.031 for     56 degrees of freedom 
# Null hypothesis probability =   4.108908e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.618831 ( -0.266445  0.252685 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.84487e-08 ( -2.08823e-08  2.11053e-08 ) ergs/cm2
 
Band function
 
Time interval is from    5.076 sec. to    6.076 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.03991   ( 1.037   1.037 )
beta        : -1.38923    ( 1.39783   0.851116 )
Epeak [keV] : 57.4806      ( -58.5303 -58.5303 )
Norm@50keV   : 9.68083E-03    ( -0.0097478   596619 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.88 using 59 PHA bins.
# Reduced chi-squared =          1.052 for     55 degrees of freedom 
# Null hypothesis probability =   3.693665e-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]    : 17.2012  (  )
R^2/D10^2   : 4.08129E-02  (-0.0397006   1.19085)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.95 using 59 PHA bins.
# Reduced chi-squared =          1.087 for     57 degrees of freedom 
# Null hypothesis probability =   3.039633e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.830e-09   1.963e-09
25- 50  1.175e-08   7.615e-09
50-150  2.024e-08   1.350e-08
15-150  3.482e-08   2.409e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.362       (-199.363      -199.363)
Norm        : 2.52991       (-1.02629     1.02633)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.40 using 59 PHA bins.
# Reduced chi-squared =          1.025 for     57 degrees of freedom 
# Null hypothesis probability =   4.237062e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.300e-09   4.126e-09
25- 50  1.212e-08   7.860e-09
50-150  2.658e-08   1.775e-08
15-150  4.500e-08   2.868e-08
Double BB
 
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.36679        (-4.64709      8.84229)
R1^2/D10^2  : 0.686846        (      )
kT2 [keV]   : 65.2633        (-65.5088      -65.5089)
R2^2/D10^2  : 7.11462E-04    (-0.000667976   0.0293895)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.19 using 59 PHA bins.
#Fit statistic : Chi-Squared =          57.10 using 59 PHA bins.
# Reduced chi-squared =          1.040 for     55 degrees of freedom 
# Reduced chi-squared =          1.038 for     55 degrees of freedom 
# Null hypothesis probability =   3.938053e-01
# Null hypothesis probability =   3.969959e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.641e-09   4.487e-09
25- 50  1.077e-08   7.315e-09
50-150  3.105e-08   2.033e-08
15-150  4.846e-08   2.646e-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: 1.20662     ( -0.138529   0.135928 )
Norm@50keV  : 4.06970E-03    ( -0.000313543   0.000312744 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.25 using 59 PHA bins.
# Reduced chi-squared =          1.162 for     57 degrees of freedom 
# Null hypothesis probability =   1.879946e-01
 
Photon flux (15-150 keV)    in 46.7 sec: 0.478151 ( -0.0390136  0.0391904 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.92459e-06 ( -1.56508e-07  1.57195e-07 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.20206     ( -0.479563   0.170527 )
Epeak [keV] : 9994.15      (   )
Norm@50keV  : 4.08923E-03    ( -0.000312185   0.00324015 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.25 using 59 PHA bins.
# Reduced chi-squared =          1.183 for     56 degrees of freedom 
# Null hypothesis probability =   1.643079e-01
 
Photon flux (15-150 keV)    in 46.7 sec: 0.476818 ( -0.040233  0.040033 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.92045e-06 ( -1.63095e-07  1.61059e-07 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.694740   ( 0.664184   5.3409 )
beta        : -1.24407    ( 1.24683   0.171925 )
Epeak [keV] : 86.6808      ( -79.1435 294.873 )
Norm@50keV   : 8.50762E-03    ( -0.0058045   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.99 using 59 PHA bins.
# Reduced chi-squared =          1.200 for     55 degrees of freedom 
# Null hypothesis probability =   1.473347e-01
 
Photon flux (15-150 keV)    in 46.7 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)  = 7.65e-07
S(50-100 keV) = 1.25e-06
 T90 vs. Hardness ratio plot 
 
T90                                   = 464 sec.
Hardness ratio (energy fluence ratio) = 1.63399
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.27133
Count Ratio (50-100 keV) / (15-25 keV) = 1.162
 Mask shadow pattern 
 
IMX = 2.129235424054261E-01, IMY = 6.526302976132271E-01
 TIME vs. PHA plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
 TIME vs. DetID plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
 100 us light curve (15-350 keV)
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
 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:
-524.123400 -507.848900
-239.424000 -18.424000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5239 -40.5250    1.1  34.4 -106.1   4.2251  10.3    1.8	Vela X-1                      
 45.7091 -27.4563    2.6  40.4   46.6   2.2915   4.5 ------	UNKNOWN                       
 73.8752 -83.8073    2.8  50.1  -37.1   2.7248   4.2 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-18.424000 28.276600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5921 -40.6061    7.1  34.5 -106.0  -0.2518  -1.6    4.2	Vela X-1                      
104.9149  -6.5209    2.8  29.9  165.6   0.3759   4.1 ------	UNKNOWN                       
 83.5872 -60.5731    2.8  27.1  -30.0   0.3408   4.1 ------	UNKNOWN                       
128.3690  -8.7312    2.0  41.5 -158.9   0.7241   5.9 ------	UNKNOWN                       
128.6329 -59.1609    0.6  34.5  -71.9   2.7000  18.2 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
83.076600 839.295900
840.576000 962.640700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5187 -40.5633    0.8  19.1 -168.2   7.7641  14.6    0.7	Vela X-1                      
170.6162 -60.6953    4.9  20.8  -72.1   1.5219   2.4    9.8	Cen X-3                       
186.6597 -62.7691    2.9  27.5  -61.9   2.8753   3.9    0.1	GX 301-2                      
 12.8548 -59.6065    4.4  51.1   31.3  11.4035   2.6 ------	UNKNOWN                       
 62.0745 -77.2277    2.5  28.0   21.0   2.7397   4.7 ------	UNKNOWN                       
126.8293 -34.1001    2.7  25.1  172.1   2.7057   4.3 ------	UNKNOWN                       
131.8687  -3.3778    3.3  55.8  179.5   9.5852   3.5 ------	UNKNOWN                       
128.6262 -59.1466    2.1   0.0 -109.4   2.6948   5.4 ------	UNKNOWN                       
133.7369 -27.1629    2.4  32.2 -175.9   2.8833   4.8 ------	UNKNOWN                       
152.4910 -58.2937    0.9  12.4  -88.2   6.5312  12.3 ------	UNKNOWN                       
Plot creation:
Thu May 28 14:05:02 EDT 2015