Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 12 03:12:19 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger555880
======================================================================

  Trigger: 00555880      Segment: 000

  BAT Trigger Time: 390273688.396   [s; MET]
      Trigger Stop: 390273688.46   [s; MET]
               UTC: 2013-05-15T01:21:17.839880    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 283.421862578053   Dec: -54.2810228525545  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.13
     Image Trigger?:     NO
     Rate S/N Ratio:     60.390396587537  [ if not an image trigger ]
     Image S/N Ratio:    7.13

  Analysis Position:   [ source = BAT ]
    RA: 283.421862578053   Dec: -54.2810228525545  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 283.436108777723   Dec: -54.2823007474519  [deg; J2000]  
        { 18h 53m 44.7s , -54d 16' 56.3" }
         +/- 1.58171427143075 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.676250945416898 [arcmin] (formal 1-sigma fit error)
    SNR: 15.7997334837692
 
  Angular difference between the analysis and refined position is 0.504873 arcmin
 
  Partial Coding Fraction: 0.6953125    [ including projection effects ]

  Duration
     T90: 0.295999944210052 +/- 0.0609261752673085
        Measured from: -0.0160000324249268
                   to: 0.279999911785126     [s; relative to TRIGTIME]
     T50: 0.151999950408936 +/- 0.0526117745496101
        Measured from: 0.0199999809265137
                   to: 0.171999931335449     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.350000023841858     
                   to: 0.649999976158142     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0360000133514404     
                   to: 0.331999957561493     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.029868   0.053789   0.083314   0.024511
           0.005169   0.006484   0.006710   0.005640 [error]
 Peak      0.027870   0.056204   0.080536   0.022308
           0.007449   0.008580   0.008336   0.007198 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.368   -0.036    0.332
T90     0.296   -0.016    0.280
T50     0.152    0.020    0.172
Peak    1.000   -0.350    0.650
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_index}
Ph_90err   : 90% error of the photon index
Epeak      : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm       : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: N/A)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -0.770    -0.181      0.186       -           -               -         3.45e-02     -3.67e-03          3.64e-03      60.980   57
CPL     -0.330    -0.562      0.904      233.597    -233.597      -233.597      5.25e-02        N/A               N/A         60.000   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -0.891     -0.233     0.242       -           -               -         1.25e-02     -1.74e-03          1.73e-03      58.370   57
CPL      0.189     -1.081     1.630      122.446     -38.956      -122.446      3.51e-02     -3.51e-02          1.09e-01      55.730   56
 
 
=== Fluence/Peak Flux Summary ===
 
              Model    Band1     Band2     Band3     Band4     Band5     Total
                       15-25     25-50    50-100    100-350    15-150    15-350    keV
Fluence         PL   8.22e-09  2.37e-08  5.57e-08  3.56e-07  1.50e-07  4.44e-07   erg/cm2
      90%_error_low -1.75e-09 -3.14e-09 -6.21e-09 -8.48e-08 -1.70e-08 -8.85e-08   erg/cm2
      90%_error_hi   1.89e-09  3.09e-09  6.15e-09  1.03e-07  1.71e-08  1.05e-07   erg/cm2
Peak flux       PL   2.87e-01  4.16e-01  4.49e-01  9.03e-01  1.43e+00  2.06e+00   ph/cm2/s
      90%_error_low -7.80e-02 -7.36e-02 -6.53e-02 -2.55e-01 -1.99e-01 -3.11e-01   ph/cm2/s
      90%_error_hi   8.67e-02  7.25e-02  6.47e-02  3.14e-01  1.99e-01  3.30e-01   ph/cm2/s
 
Fluence        CPL   1.31e-09  1.37e-09  1.14e-09  2.84e-09  7.32e-09  1.26e-08   erg/cm2
      90%_error_low    N/A       N/A       N/A       N/A       N/A       N/A      erg/cm2
      90%_error_hi     N/A       N/A       N/A       N/A       N/A       N/A      erg/cm2
Peak flux      CPL   2.06e-01  4.25e-01  5.06e-01  3.99e-01  1.37e+00  1.54e+00   ph/cm2/s
      90%_error_low -1.05e-01 -8.61e-02 -8.82e-02 -2.12e-01 -2.16e-01 -3.22e-01   ph/cm2/s
      90%_error_hi   1.18e-01  8.30e-02  9.28e-02  5.41e-01  2.12e-01  5.37e-01   ph/cm2/s
 
======================================================================
  • 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
  283.4361   -54.2823   0.0121    24.1920   141.3940         0.1966767     15.800 TRIG_00555880                 
 
Foreground time interval of the image:
 -0.036   0.332 (delta_t =   0.368 [sec])
Background time interval of the image:
-147.895  -0.036 (delta_t = 147.859 [sec])




    Light Curves

    Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

    Full-time range; 1 s binning

    Bokeh Plot

    Other quick-look light curves:




    Spectra

    Notes:

    Time averaged spectrum fit using the average DRM

    Power-law model
    Time interval is from   -0.036 sec. to    0.332 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.769505     ( -0.180604   0.186431 )
Norm@50keV  : 3.45164E-02    ( -0.00366744   0.00363866 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.98 using 59 PHA bins.
# Reduced chi-squared =          1.070 for     57 degrees of freedom 
# Null hypothesis probability =   3.347632e-01
 
Photon flux (15-150 keV)    in 0.368 sec: 0.262258 0.199025 0.151302 3.63373E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.50389e-07 ( -1.70318e-08  1.71194e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.036 sec. to    0.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.330154     ( -0.561922   0.90365 )
Epeak [keV] : 233.597      ( -233.588 -233.588 )
Norm@50keV  : 5.24771E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.00 using 59 PHA bins.
# Reduced chi-squared =          1.071 for     56 degrees of freedom 
# Null hypothesis probability =   3.329590e-01
 
Photon flux (15-150 keV)    in 0.368 sec: 3.91074 ( -0.42808  0.42593 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.31639e-09 ( 0  0 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.350 sec. to    0.650 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.890949     ( -0.232596   0.241533 )
Norm@50keV  : 1.24751E-02    ( -0.00173902   0.0017273 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.37 using 59 PHA bins.
# Reduced chi-squared =          1.024 for     57 degrees of freedom 
# Null hypothesis probability =   4.247819e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.43177 ( -0.19881  0.19936 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.40514e-07 ( -2.07269e-08  2.0881e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.350 sec. to    0.650 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.189485     ( -1.08129   1.62921 )
Epeak [keV] : 122.446      ( -38.9131 -122.403 )
Norm@50keV  : 3.51174E-02    ( -0.0351454   0.109364 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.73 using 59 PHA bins.
# Reduced chi-squared =         0.9952 for     56 degrees of freedom 
# Null hypothesis probability =   4.850958e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.36703 ( -0.21571  0.2124 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.3467e-07 ( -2.23648e-08  2.22181e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

    S(15-50 keV) vs. S(50-150 keV) plot 

    S(15-50 keV)  = N/A
S(50-150 keV) = N/A

    The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.




    Mask shadow pattern 

    IMX = -3.510695361386565E-01, IMY = -2.803151470316865E-01

    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:
-147.895410 -0.036000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2245 -60.6206    4.2  35.5   13.0   0.5910   2.8    2.7	Cen X-3                       
187.1008 -62.7699  105.7  30.7   25.3   0.0223   0.1   12.2	GX 301-2                      
264.7253 -44.2902   74.2  35.0  117.9   0.0568   0.2    9.6	4U 1735-44                    
232.6834 -44.7627    2.4  38.9   80.2   2.8965   4.8 ------	UNKNOWN                       
166.2416 -66.7983    2.3  30.3    6.2   0.8911   5.0 ------	UNKNOWN                       
315.5066 -58.7336    2.6  22.2 -171.9   0.6599   4.4 ------	UNKNOWN                       
338.8428 -72.5978    2.1  14.2 -122.5   0.7934   5.4 ------	UNKNOWN                       
337.3728 -24.7549    3.5  58.7 -159.2   3.5815   3.3 ------	UNKNOWN                       
119.6331 -42.0796    2.3  59.1  -24.2   5.8691   4.9 ------	UNKNOWN                       
 98.4815 -49.3963    3.0  52.1  -42.2   3.5108   3.8 ------	UNKNOWN                       
357.3110 -36.4895    2.5  51.0 -135.6   4.0220   4.6 ------	UNKNOWN

    Pre-slew background subtracted image of 15-350 keV band 

    Time interval of the image:
-0.036000 0.332000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.0834 -60.6190    5.7  35.5   12.9  -0.0285  -2.0    6.8	Cen X-3                       
186.8417 -62.6680    3.8  30.8   25.2   0.0415   3.0    8.0	GX 301-2                      
264.9090 -44.4620    6.3  34.8  118.1  -0.0433  -1.8    7.1	4U 1735-44                    
238.0437 -43.7620    1.8  39.0   86.5   0.2745   6.3 ------	UNKNOWN                       
283.4361 -54.2823    0.7  24.2  141.4   0.1967  15.8 ------	UNKNOWN                       
237.6035 -79.4410    2.7   8.7   23.8   0.0395   4.2 ------	UNKNOWN                       
  8.3272 -70.8473    2.5  21.2 -102.0   0.0521   4.7 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
58.904590 836.504620
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.5294 -60.6066    6.4  53.4   13.0   4.7473   1.8    6.4	Cen X-3                       
186.6576 -62.8815    4.9  46.3   17.6   3.4227   2.3    6.7	GX 301-2                      
255.9598 -37.8425    0.8  24.9   98.8  13.5304  14.3    1.3	4U 1700-377                   
256.4871 -36.6004    4.4  25.6  101.4  -2.7227  -2.6   10.9	GX 349+2                      
263.0018 -24.7288   81.3  33.2  123.4   0.1856   0.1    1.1	GX 1+4                        
264.8364 -44.4072    6.7  15.6  100.6   1.1786   1.7    4.8	4U 1735-44                    
270.3372 -25.2573    0.0  30.6  135.0   2.2305   2.2   11.1	GX 5-1                        
270.4024 -25.7804    5.3  30.1  134.9   2.2066   2.2    5.8	GRS 1758-258                  
273.8748 -14.0202    3.9  41.0  144.5   5.8329   3.0    7.7	GX 17+2                       
275.9858 -30.4683    2.7  24.4  143.1   3.2102   4.2    6.8	H1820-303                     
284.9477 -24.7683    5.6  29.6  161.6   1.7677   2.0   10.3	HT1900.1-2455                 
262.9936 -33.8316   53.8  25.0  115.4   0.1885   0.2    0.3	GX 354-0                      
250.3512 -53.9766    4.0  19.2   56.2   1.9760   2.9 ------	UNKNOWN                       
261.2157 -75.3598    4.2  22.7   -6.9   1.8803   2.8 ------	UNKNOWN                       
316.8314  -1.3767    4.5  59.6 -161.6  17.5692   2.6 ------	UNKNOWN                       
318.3351  -2.8770    4.3  58.7 -159.3  15.5179   2.7 ------	UNKNOWN                       
 28.8530 -66.4081    3.6  47.0  -53.1  13.5089   3.2 ------	UNKNOWN                       
333.8151 -23.2566    3.4  48.5 -130.3  12.7065   3.4 ------	UNKNOWN                       
339.3170 -33.4424    3.4  43.9 -116.1  13.4095   3.4 ------	UNKNOWN                       
347.1049 -44.1975    5.6  41.3  -98.2  10.1865   2.1 ------	UNKNOWN