Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 12 02:26:24 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger557310
======================================================================

  Trigger: 00557310      Segment: 000

  BAT Trigger Time: 391967364.768   [s; MET]
      Trigger Stop: 391967364.8   [s; MET]
               UTC: 2013-06-03T15:49:14.136600    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 172.20866268286   Dec: 17.0451158220811  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    17.27
     Image Trigger?:     NO
     Rate S/N Ratio:     242.441745580253  [ if not an image trigger ]
     Image S/N Ratio:    17.27

  Analysis Position:   [ source = BAT ]
    RA: 172.20866268286   Dec: 17.0451158220811  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 172.221471892461   Dec: 17.0632338872491  [deg; J2000]  
        { 11h 28m 53.2s , +17d 03' 47.6" }
         +/- 0.717474690355698 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.237390618169689 [arcmin] (formal 1-sigma fit error)
    SNR: 48.8774986204871
 
  Angular difference between the analysis and refined position is 1.312105 arcmin
 
  Partial Coding Fraction: 1    [ including projection effects ]

  Duration
     T90: 0.175999999046326 +/- 0.0240000486373901
        Measured from: 0.0119999647140503
                   to: 0.187999963760376     [s; relative to TRIGTIME]
     T50: 0.059999942779541 +/- 0.00400000810623169
        Measured from: 0.0239999890327454
                   to: 0.0839999318122864     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.364000022411346     
                   to: 0.635999977588654     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.00800001621246338     
                   to: 0.259999990463257     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.132881   0.277126   0.307952   0.123182
           0.006679   0.009147   0.010285   0.008639 [error]
 Peak      0.140651   0.284678   0.309057   0.124159
           0.008400   0.010336   0.011167   0.009387 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.252    0.008    0.260
T90     0.176    0.012    0.188
T50     0.060    0.024    0.084
Peak    1.000   -0.364    0.636
 
 
====== 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: 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      -0.822    -0.065      0.066       -           -               -         2.15e-01     -7.81e-03          7.80e-03      58.800   57
CPL     -0.750    -0.099      0.248      997.498    -997.498      -997.498      2.31e-01     -2.16e-02          6.54e-02      58.570   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      -0.853     -0.072     0.073       -           -               -         5.54e-02     -2.19e-03          2.19e-03      57.860   57
CPL     -0.847     -0.072     0.074     9999.360    -9999.360      -9999.360      5.58e-02     -2.17e-03          1.60e-02      57.860   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   3.68e-08  1.03e-07  2.32e-07  1.40e-06  6.27e-07  1.78e-06   erg/cm2
      90%_error_low -2.71e-09 -4.50e-09 -9.65e-09 -1.33e-07 -2.63e-08 -1.38e-07   erg/cm2
      90%_error_hi   2.78e-09  4.47e-09  9.61e-09  1.42e-07  2.64e-08  1.47e-07   erg/cm2
Peak flux       PL   1.23e+00  1.83e+00  2.02e+00  4.22e+00  6.36e+00  9.30e+00   ph/cm2/s
      90%_error_low -1.03e-01 -9.17e-02 -8.75e-02 -3.99e-01 -2.50e-01 -4.44e-01   ph/cm2/s
      90%_error_hi   1.06e-01  9.11e-02  8.71e-02  4.27e-01  2.51e-01  4.56e-01   ph/cm2/s
 
Fluence        CPL   3.62e-08  1.03e-07  2.54e-07  1.33e-06  6.24e-07  1.64e-06   erg/cm2
      90%_error_low -3.35e-09 -4.61e-09 -3.02e-08 -4.37e-07 -2.78e-08 -3.69e-07   erg/cm2
      90%_error_hi   2.98e-09  4.87e-09  -8.46e-09  1.08e-07  2.77e-08  2.95e-07   erg/cm2
Peak flux      CPL   1.23e+00  1.83e+00  2.02e+00  4.21e+00  6.36e+00  9.28e+00   ph/cm2/s
      90%_error_low -1.32e-01 -9.28e-02 -8.72e-02 -1.09e+00 -2.51e-01 -1.07e+00   ph/cm2/s
      90%_error_hi   1.06e-01  7.51e-02  1.04e-01  4.18e-01  2.50e-01  4.18e-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
  172.2215    17.0632   0.0040    10.6879   152.0417         0.8602893     48.877 TRIG_00557310                 
 
Foreground time interval of the image:
  0.008   0.260 (delta_t =   0.252 [sec])
Background time interval of the image:
-239.768   0.008 (delta_t = 239.776 [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    0.008 sec. to    0.260 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.82213     ( -0.0652556   0.065733 )
Norm@50keV  : 0.214760    ( -0.00780902   0.00779875 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.80 using 59 PHA bins.
# Reduced chi-squared =          1.032 for     57 degrees of freedom 
# Null hypothesis probability =   4.092510e-01
 
Photon flux (15-150 keV)    in 0.252 sec: 24.6658 ( -0.8911  0.8912 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.26686e-07 ( -2.63418e-08  2.64451e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.008 sec. to    0.260 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.75039     ( -0.0989092   0.248112 )
Epeak [keV] : 997.498      ( -998.36 -998.36 )
Norm@50keV  : 0.231323    ( -0.0215412   0.0654065 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.57 using 59 PHA bins.
# Reduced chi-squared =          1.046 for     56 degrees of freedom 
# Null hypothesis probability =   3.814122e-01
 
Photon flux (15-150 keV)    in 0.252 sec: 24.6021 ( -0.9155  0.9136 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.24108e-07 ( -2.78004e-08  2.7746e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.364 sec. to    0.636 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.852985     ( -0.0719528   0.072621 )
Norm@50keV  : 5.54337E-02    ( -0.00219363   0.00218883 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.86 using 59 PHA bins.
# Reduced chi-squared =          1.015 for     57 degrees of freedom 
# Null hypothesis probability =   4.434230e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.36302 ( -0.25046  0.25058 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.3387e-07 ( -2.83758e-08  2.84838e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.364 sec. to    0.636 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.847217     ( -0.0719322   0.0737469 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 5.58127E-02    ( -0.00217249   0.0159567 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.86 using 59 PHA bins.
# Reduced chi-squared =          1.033 for     56 degrees of freedom 
# Null hypothesis probability =   4.062690e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.36296 ( -0.25147  0.24975 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.3403e-07 ( -2.76708e-08  2.86288e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 0.176 sec.
Hardness ratio (energy fluence ratio) = 2.26245440186

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

    S(15-50 keV)  = 1.3946882e-07
S(50-150 keV) = 4.872215e-07

    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 = -1.667061113585569E-01, IMY = -8.848377010167226E-02

    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:
-239.768000 0.008000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
237.3272  51.9437    2.3  52.8   11.3   3.9599   4.9 ------	UNKNOWN                       
188.1594  31.5097    2.8  13.6   37.3   0.8190   4.1 ------	UNKNOWN                       
125.0828   7.3626    3.2  49.8 -137.6   2.9470   3.6 ------	UNKNOWN                       
136.1929  74.9418    4.5  50.7  -44.5   2.9778   2.6 ------	UNKNOWN                       
123.2475   8.5931    2.8  50.7 -135.1   4.3339   4.2 ------	UNKNOWN

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

    Time interval of the image:
0.008000 0.260000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
172.2215  17.0632    0.2  10.7  152.0   0.8603  48.9 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
42.532590 785.632600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
185.2934  23.0536    3.0  13.7   37.7   1.8985   3.8 ------	UNKNOWN                       
203.4626  47.3707    3.0  39.7    9.2   3.0794   3.9 ------	UNKNOWN                       
181.0740  20.7589    3.4   9.2   40.6   1.6812   3.4 ------	UNKNOWN                       
180.7796  38.6141    2.9  22.8   -6.7   2.0440   3.9 ------	UNKNOWN                       
162.1907   9.9935    2.9  12.0 -149.0   1.9194   3.9 ------	UNKNOWN                       
143.6604  18.0066    3.3  27.2 -107.9   2.1836   3.5 ------	UNKNOWN                       
130.3306 -25.2558    4.5  58.8 -159.3  10.3648   2.5 ------	UNKNOWN