Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jan 22 18:32:46 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger180977
======================================================================

  Trigger: 00180977      Segment: 000

  BAT Trigger Time: 161240330.816   [s; MET]
      Trigger Stop: 161240331.84   [s; MET]
               UTC: 2006-02-10T04:58:49.809180    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 57.7298227424729   Dec: 27.025788071336  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.42
     Image Trigger?:     NO
     Rate S/N Ratio:     27.5862284482674  [ if not an image trigger ]
     Image S/N Ratio:    8.42

  Analysis Position:   [ source = BAT ]
    RA: 57.7298227424729   Dec: 27.025788071336  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 57.7255117215847   Dec: 27.0167612671884  [deg; J2000]  
        { 03h 50m 54.1s , +27d 01' 00.3" }
         +/- 1.03448752448959 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.292126827145363 [arcmin] (formal 1-sigma fit error)
    SNR: 28.9789267884414
 
  Angular difference between the analysis and refined position is 0.588588 arcmin
 
  Partial Coding Fraction: 0.4101562    [ including projection effects ]

  Duration
     T90: 288 +/- 151.789327688082
        Measured from: -235.816000014544
                   to: 52.1839999854565     [s; relative to TRIGTIME]
     T50: 48 +/- 16
        Measured from: -59.8160000145435
                   to: -11.8160000145435     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -36.3160000145435     
                   to: -35.3160000145435     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -235.816000014544     
                   to: 132.183999985456     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.649328   4.181723   3.401963   1.171541
           0.188011   0.194513   0.171598   0.150626 [error]
 Peak      0.021079   0.051364   0.054600   0.040182
           0.010735   0.011899   0.011083   0.009735 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  368.000 -235.816  132.184
T90   288.000 -235.816   52.184
T50    48.000  -59.816  -11.816
Peak    1.000  -36.316  -35.316
 
 
====== 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      -1.483    -0.090      0.090       -           -               -         2.19e-03     -1.12e-04          1.12e-04      59.700   57
CPL     -1.186    -0.331      0.384      150.080     -58.675      -150.080      3.02e-03     -8.72e-04          1.49e-03      57.690   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      -0.900     -0.401     0.458       -           -               -         1.05e-02     -2.77e-03          2.60e-03      56.700   57
CPL     -0.829     -0.472     1.686      996.839    -996.839      -996.839      1.12e-02     -3.47e-03          -1.12e-02      56.750   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   1.01e-06  1.88e-06  2.70e-06  8.16e-06  7.68e-06  1.37e-05   erg/cm2
      90%_error_low -9.70e-08 -1.09e-07 -1.66e-07 -1.06e-06 -4.11e-07 -1.18e-06   erg/cm2
      90%_error_hi   1.00e-07  1.09e-07  1.66e-07  1.17e-06  4.13e-07  1.25e-06   erg/cm2
Peak flux       PL   2.44e-01  3.51e-01  3.76e-01  7.50e-01  1.20e+00  1.72e+00   ph/cm2/s
      90%_error_low -1.21e-01 -1.23e-01 -8.25e-02 -3.06e-01 -3.03e-01 -3.85e-01   ph/cm2/s
      90%_error_hi   1.53e-01  1.20e-01  8.24e-02  4.31e-01  3.09e-01  3.98e-01   ph/cm2/s
 
Fluence        CPL   9.49e-07  1.93e-06  2.77e-06  5.55e-06  7.56e-06  1.12e-05   erg/cm2
      90%_error_low -1.22e-07 -1.22e-07 -1.91e-07 -1.96e-06 -4.39e-07 -1.98e-06   erg/cm2
      90%_error_hi   1.25e-07  1.23e-07  1.94e-07  2.67e-06  4.37e-07  3.00e-06   erg/cm2
Peak flux      CPL   2.43e-01  3.51e-01  3.77e-01  7.44e-01  1.20e+00  1.83e+00   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A       N/A   -1.83e+00   ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A       N/A    2.01e-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
   57.7255    27.0168   0.0067    44.1510   178.6306         3.1474948     28.979 TRIG_00180977                 
 
Foreground time interval of the image:
-21.115  15.485 (delta_t =  36.600 [sec])
Background time interval of the image:




    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 -235.816 sec. to  132.184 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.4828     ( -0.0903864   0.0904218 )
Norm@50keV  : 2.19363E-03    ( -0.000111705   0.000111694 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.70 using 59 PHA bins.
# Reduced chi-squared =          1.047 for     57 degrees of freedom 
# Null hypothesis probability =   3.779412e-01
 
Photon flux (15-150 keV)    in 368 sec: 0.272610 ( -0.015089  0.015142 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.68101e-06 ( -4.1145e-07  4.12521e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from -235.816 sec. to  132.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.18599     ( -0.331217   0.38423 )
Epeak [keV] : 150.080      ( -58.6749 -150.08 )
Norm@50keV  : 3.01663E-03    ( -0.000872158   0.00148979 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.69 using 59 PHA bins.
# Reduced chi-squared =          1.030 for     56 degrees of freedom 
# Null hypothesis probability =   4.126975e-01
 
Photon flux (15-150 keV)    in 368 sec: 0.268058 ( -0.015975  0.016056 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.56358e-06 ( -4.3902e-07  4.37118e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from  -36.316 sec. to  -35.316 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.900204     ( -0.401352   0.457586 )
Norm@50keV  : 1.04834E-02    ( -0.00276643   0.00259711 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.70 using 59 PHA bins.
# Reduced chi-squared =         0.9947 for     57 degrees of freedom 
# Null hypothesis probability =   4.863158e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.20325 ( -0.303284  0.30945 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.17655e-07 ( -2.59823e-08  2.59601e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -36.316 sec. to  -35.316 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.892986     ( -0.471619   1.68589 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 1.05516E-02    ( -0.00277123   -0.010552 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.70 using 59 PHA bins.
# Reduced chi-squared =          1.013 for     56 degrees of freedom 
# Null hypothesis probability =   4.486228e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.20289 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.17706e-07 ( -2.67168e-08  2.52492e-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 = -9.705164329411058E-01, IMY = -2.319986671718222E-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:

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

    Time interval of the image:
-21.115400 15.484620
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6244  22.0007    1.8  47.9  145.4   1.6389   6.5    1.0	Crab                          
 94.9767  34.5735    2.3  36.5  128.4   0.6465   5.0 ------	UNKNOWN                       
160.9559  62.5085    2.4  31.9   33.9   0.4132   4.8 ------	UNKNOWN                       
 57.7255  27.0168    0.4  44.2  178.6   3.1475  29.0 ------	UNKNOWN                       
 50.0710  52.2664    2.5  21.4 -156.9   0.2614   4.6 ------	UNKNOWN                       
 33.2657  78.2816    2.4  14.2  -61.3   0.2959   4.7 ------	UNKNOWN                       
283.9887  58.1034    2.2  50.7  -44.4   1.6611   5.2 ------	UNKNOWN                       
  3.7843  44.6888    3.0  43.1 -112.1   1.0147   3.9 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
81.084590 302.238700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6363  22.0115    0.3  24.1  107.6  10.1075  44.4    0.2	Crab                          
 75.9270  10.7949    2.1  23.6  141.2   1.0297   5.4 ------	UNKNOWN                       
 57.7543  27.0121    1.3   0.0  131.9   1.5268   9.2 ------	UNKNOWN                       
 54.3375 -11.7511    2.5  38.9 -163.5   1.1749   4.7 ------	UNKNOWN                       
354.4429  66.1135    3.0  54.7  -15.1   2.0799   3.8 ------	UNKNOWN                       
 49.3789 -19.8446    2.4  47.6 -158.1   1.6976   4.8 ------	UNKNOWN                       
 42.9917 -20.2067    3.1  49.3 -150.5   1.6177   3.7 ------	UNKNOWN                       
357.5497  42.5218    3.9  50.7  -44.5   3.0284   2.9 ------	UNKNOWN