Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 12 22:39:18 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger541371
======================================================================

  Trigger: 00541371      Segment: 000

  BAT Trigger Time: 376988183.36   [s; MET]
      Trigger Stop: 376988184.384   [s; MET]
               UTC: 2012-12-12T06:56:13.384600    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 177.840777609451   Dec: 78.0344305601871  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.64
     Image Trigger?:     NO
     Rate S/N Ratio:     13.3416640641263  [ if not an image trigger ]
     Image S/N Ratio:    7.64

  Analysis Position:   [ source = BAT ]
    RA: 177.840777609451   Dec: 78.0344305601871  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 177.771495544344   Dec: 78.0463430621091  [deg; J2000]  
        { 11h 51m 05.2s , +78d 02' 46.8" }
         +/- 2.0305951457139 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.766429314351042 [arcmin] (formal 1-sigma fit error)
    SNR: 11.0574875869353
 
  Angular difference between the analysis and refined position is 1.119325 arcmin
 
  Partial Coding Fraction: 1    [ including projection effects ]

  Duration
     T90: 6.05599993467331 +/- 1.38059841220134
        Measured from: 0.0519999861717224
                   to: 6.10799992084503     [s; relative to TRIGTIME]
     T50: 3.71199995279312 +/- 0.904267709638263
        Measured from: 0.483999967575073
                   to: 4.19599992036819     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.015999972820282     
                   to: 1.01599997282028     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.48400002717972     
                   to: 6.62799996137619     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.173185   0.089251   0.060750   0.010626
           0.015780   0.015947   0.013777   0.012164 [error]
 Peak      0.038617   0.037494   0.015539   0.004823
           0.005762   0.005940   0.005075   0.004324 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    8.112   -1.484    6.628
T90     6.056    0.052    6.108
T50     3.712    0.484    4.196
Peak    1.000    0.016    1.016
 
 
====== 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      -2.504    -0.403      0.349       -           -               -         1.71e-03     -4.75e-04          4.68e-04      55.820   57
CPL     -1.879     N/A        N/A           8.420      N/A           N/A         3.84e-03        N/A               N/A         59.330   56
 
 
=== 1-s peak 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      -2.052     -0.382     0.341       -           -               -         4.88e-03     -1.26e-03          1.21e-03      81.430   57
CPL     -2.054     -1.139     2.122      526.105      N/A           N/A         4.86e-03        N/A               N/A         81.430   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   4.60e-08  4.61e-08  3.25e-08  3.64e-08  1.39e-07  1.61e-07   erg/cm2
      90%_error_low -8.17e-09 -8.28e-09 -1.17e-08 -2.01e-08 -2.64e-08 -3.83e-08   erg/cm2
      90%_error_hi   8.19e-09  7.76e-09  1.33e-08  3.38e-08  2.82e-08  4.91e-08   erg/cm2
Peak flux       PL   3.42e-01  2.49e-01  1.20e-01  8.19e-02  7.50e-01  7.93e-01   ph/cm2/s
      90%_error_low -8.11e-02 -4.55e-02 -3.93e-02 -4.17e-02 -1.33e-01 -1.44e-01   ph/cm2/s
      90%_error_hi   8.33e-02  4.50e-02  4.13e-02  6.25e-02  1.33e-01  1.46e-01   ph/cm2/s
 
Fluence        CPL   4.52e-08  4.48e-08  1.74e-08  2.85e-09  1.27e-07  1.46e-07   erg/cm2
      90%_error_low -9.93e-09 -3.86e-09    N/A    7.62e-11    N/A       N/A      erg/cm2
      90%_error_hi   6.80e-09  1.17e-08    N/A     6.52e-08    N/A       N/A      erg/cm2
Peak flux      CPL   3.39e-01  2.38e-01  1.04e-01  7.69e-02  7.18e-01  7.86e-01   ph/cm2/s
      90%_error_low     N/A   -1.16e-01 -5.58e-02 -3.93e-02 -2.81e-01     N/A     ph/cm2/s
      90%_error_hi      N/A    7.95e-02  4.51e-02  4.29e-02  1.66e-01     N/A     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
  177.7715    78.0463   0.0173    11.3716  -129.3365         0.3368584     11.057 TRIG_00541371                 
 
Foreground time interval of the image:
 -1.484   6.628 (delta_t =   8.112 [sec])
Background time interval of the image:
-239.360  -1.484 (delta_t = 237.876 [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   -1.484 sec. to    6.628 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.50435     ( -0.403059   0.349053 )
Norm@50keV  : 1.71165E-03    ( -0.000475395   0.000468431 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.82 using 59 PHA bins.
# Reduced chi-squared =         0.9793 for     57 degrees of freedom 
# Null hypothesis probability =   5.194698e-01
 
Photon flux (15-150 keV)    in 8.112 sec: 0.337190 ( -0.046319  0.046345 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.39036e-07 ( -2.63613e-08  2.82027e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.484 sec. to    6.628 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.8787     (       )
Epeak [keV] : 8.42031      (   )
Norm@50keV  : 3.83975E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.33 using 59 PHA bins.
# Reduced chi-squared =          1.060 for     56 degrees of freedom 
# Null hypothesis probability =   3.551095e-01
 
Photon flux (15-150 keV)    in 8.112 sec: 0.273218 ( -0.063021  0.078183 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.26995e-07 ( 0  0 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.016 sec. to    1.016 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.05188     ( -0.382349   0.340627 )
Norm@50keV  : 4.88023E-03    ( -0.00125844   0.00120546 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          81.43 using 59 PHA bins.
# Reduced chi-squared =          1.429 for     57 degrees of freedom 
# Null hypothesis probability =   1.853773e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.750112 ( -0.132503  0.132532 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.51627e-08 ( -1.0272e-08  1.08015e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.016 sec. to    1.016 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.05355     ( -1.13793   2.12261 )
Epeak [keV] : 526.105      (   )
Norm@50keV  : 4.86114E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          81.43 using 59 PHA bins.
# Reduced chi-squared =          1.454 for     56 degrees of freedom 
# Null hypothesis probability =   1.486579e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.717692 ( -0.281281  0.165613 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.48353e-08 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 6.056 sec.
Hardness ratio (energy fluence ratio) = 0.704952805658

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

    S(15-50 keV)  = 9.21242e-08
S(50-150 keV) = 4.690862e-08

    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 = -1.274847275817709E-01, IMY = 1.555538891043082E-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:
-239.360000 -1.484000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
191.3707  58.4989    3.2  21.0  -59.3   0.7480   3.6 ------	UNKNOWN

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

    Time interval of the image:
-1.484000 6.628000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 89.2251  43.5893    2.1  39.3  100.9   0.6570   5.5 ------	UNKNOWN                       
177.7715  78.0464    1.0  11.4 -129.3   0.3368  11.1 ------	UNKNOWN                       
200.1355  41.0122    2.1  38.8  -49.6   0.2606   5.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
52.140600 962.650000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.1062  40.9857   12.4  57.3 -149.3   4.2938   0.9    2.0	Cyg X-3                       
142.2753  42.8759    3.0  37.9   31.4   3.4631   3.8 ------	UNKNOWN                       
165.9449  24.5777    2.8  53.7    0.9   6.4963   4.1 ------	UNKNOWN                       
179.5741  29.6310    2.6  48.4  -14.6   4.8714   4.4 ------	UNKNOWN                       
293.5919  66.4343    3.1  30.6 -147.5   2.0527   3.7 ------	UNKNOWN                       
267.1842  69.8916    2.7  23.2 -131.6   2.3325   4.3 ------	UNKNOWN                       
193.2666  33.5628    5.1  45.0  -30.8   2.2474   2.3 ------	UNKNOWN                       
322.3046  40.4961    4.0  59.6 -161.7  16.9274   2.9 ------	UNKNOWN