Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Fri Jan 17 19:24:45 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger416076
======================================================================

  Trigger: 00416076      Segment: 000

  BAT Trigger Time: 290398986.048   [s; MET]
      Trigger Stop: 290398988.096   [s; MET]
               UTC: 2010-03-16T02:23:00.430180    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 252.031620948293   Dec: 71.8254875350265  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.09
     Image Trigger?:     NO
     Rate S/N Ratio:     13.7113092008021  [ if not an image trigger ]
     Image S/N Ratio:    8.09

  Analysis Position:   [ source = BAT ]
    RA: 252.031620948293   Dec: 71.8254875350265  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 251.954967264097   Dec: 71.8182472120343  [deg; J2000]  
        { 16h 47m 49.2s , +71d 49' 05.7" }
         +/- 1.66405369542645 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.735874335362166 [arcmin] (formal 1-sigma fit error)
    SNR: 14.6948461306747
 
  Angular difference between the analysis and refined position is 1.499152 arcmin
 
  Partial Coding Fraction: 0.1621094    [ including projection effects ]

  Duration
     T90: 6.75200003385544 +/- 0.951865531564711
        Measured from: -0.695999979972839
                   to: 6.0560000538826     [s; relative to TRIGTIME]
     T50: 3.45600003004074 +/- 0.845430073540578
        Measured from: 0.600000023841858
                   to: 4.0560000538826     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.94800001382828     
                   to: 2.94800001382828     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.20800000429153     
                   to: 6.7600000500679     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.294856   0.399444   0.405071   0.082008
           0.041435   0.044327   0.038530   0.031579 [error]
 Peak      0.069012   0.086164   0.081433   0.004933
           0.015376   0.015731   0.014633   0.011339 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    7.968   -1.208    6.760
T90     6.752   -0.696    6.056
T50     3.456    0.600    4.056
Peak    1.000    1.948    2.948
 
 
====== 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      -1.462    -0.183      0.182       -           -               -         1.08e-02     -1.14e-03          1.14e-03      52.510   57
CPL     -1.112    -0.499      0.822      139.396     -67.906      -139.396      1.58e-02        N/A               N/A         51.820   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      -1.459     -0.299     0.299       -           -               -         1.83e-02     -3.21e-03          3.21e-03      53.640   57
CPL     -1.100     -1.389     1.414      134.089    -134.089      -134.089      2.72e-02     -1.19e-02          9.55e-02      53.360   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   1.06e-07  2.00e-07  2.90e-07  8.96e-07  8.22e-07  1.49e-06   erg/cm2
      90%_error_low -1.98e-08 -2.33e-08 -3.78e-08 -2.30e-07 -9.27e-08 -2.60e-07   erg/cm2
      90%_error_hi   2.09e-08  2.31e-08  3.73e-08  2.76e-07  9.31e-08  2.96e-07   erg/cm2
Peak flux       PL   7.24e-01  7.46e-01  5.43e-01  6.34e-01  2.26e+00  2.65e+00   ph/cm2/s
      90%_error_low -2.19e-01 -1.49e-01 -1.14e-01 -2.36e-01 -4.16e-01 -4.65e-01   ph/cm2/s
      90%_error_hi   2.41e-01  1.46e-01  1.12e-01  3.06e-01  4.18e-01  4.66e-01   ph/cm2/s
 
Fluence        CPL   9.83e-08  2.05e-07  3.01e-07  5.76e-07  8.10e-07  1.18e-06   erg/cm2
      90%_error_low -2.53e-08 -2.61e-08 -4.35e-08 -3.21e-07 -9.69e-08 -3.34e-07   erg/cm2
      90%_error_hi   2.58e-08  2.69e-08  4.49e-08  5.44e-07  9.65e-08  4.19e-07   erg/cm2
Peak flux      CPL   6.71e-01  7.69e-01  5.66e-01  4.42e-01  2.23e+00  2.45e+00   ph/cm2/s
      90%_error_low -2.71e-01 -1.64e-01 -1.30e-01 -4.42e-01 -4.29e-01 -5.63e-01   ph/cm2/s
      90%_error_hi   2.79e-01  1.72e-01  1.39e-01  2.72e-01  4.29e-01  6.24e-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
  251.9550    71.8182   0.0130    43.9846   144.0835         1.2491296     14.695 TRIG_00416076                 
 
Foreground time interval of the image:
 -1.208   6.760 (delta_t =   7.968 [sec])
Background time interval of the image:
-239.048  -1.208 (delta_t = 237.840 [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   -1.208 sec. to    6.760 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.46189     ( -0.182666   0.182066 )
Norm@50keV  : 1.08085E-02    ( -0.00114072   0.00113872 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.51 using 59 PHA bins.
# Reduced chi-squared =         0.9211 for     57 degrees of freedom 
# Null hypothesis probability =   6.441854e-01
 
Photon flux (15-150 keV)    in 7.968 sec: 1.33600 ( -0.14827  0.14882 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.22449e-07 ( -9.26902e-08  9.30742e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.208 sec. to    6.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.11156     ( -0.498816   0.822134 )
Epeak [keV] : 139.396      ( -67.9033 -139.393 )
Norm@50keV  : 1.57605E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.82 using 59 PHA bins.
# Reduced chi-squared =         0.9253 for     56 degrees of freedom 
# Null hypothesis probability =   6.338429e-01
 
Photon flux (15-150 keV)    in 7.968 sec: 1.31381 ( -0.15599  0.15546 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.10306e-07 ( -9.68789e-08  9.65315e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    1.948 sec. to    2.948 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.45868     ( -0.298903   0.298999 )
Norm@50keV  : 1.82913E-02    ( -0.00321475   0.00321011 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.64 using 59 PHA bins.
# Reduced chi-squared =         0.9411 for     57 degrees of freedom 
# Null hypothesis probability =   6.017522e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.25909 ( -0.41578  0.4179 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.74779e-07 ( -3.26901e-08  3.28892e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    1.948 sec. to    2.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.09954     ( -1.38869   1.41444 )
Epeak [keV] : 134.089      ( -134.089 -134.089 )
Norm@50keV  : 2.72483E-02    ( -0.0119156   0.0954937 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.36 using 59 PHA bins.
# Reduced chi-squared =         0.9529 for     56 degrees of freedom 
# Null hypothesis probability =   5.754241e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.22783 ( -0.42878  0.42891 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.71993e-07 ( -3.45065e-08  3.40747e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 6.752 sec.
Hardness ratio (energy fluence ratio) = 1.45211134577

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

    S(15-50 keV)  = 3.056872e-07
S(50-150 keV) = 5.167621e-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 = -7.816647915960692E-01, IMY = -5.661738871788703E-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:
-239.048000 -1.208000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4224  35.2152   12.7  36.6   87.0   0.4803   0.9    7.8	Her X-1                       
268.4815  -1.4159   11.1  46.8   28.6  -0.5508  -1.0    7.2	SW J1753.5-0127               
274.0953 -14.1817   12.7  55.0   14.1  -0.9538  -0.9   10.2	GX 17+2                       
288.7958  10.9715    0.7  26.1    8.1   3.3169  17.4    1.6	GRS 1915+105                  
299.5863  35.1997    0.2   0.0   28.7   9.3805  50.0    0.2	Cyg X-1                       
308.0904  40.9425    1.1   8.8 -149.7   1.8814  10.5    1.1	Cyg X-3                       
325.9235  38.2820    0.0  21.2 -122.6   0.2614   1.3   11.9	Cyg X-2                       
254.5614  54.0626    2.4  36.3  119.0   1.8671   4.7 ------	UNKNOWN

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

    Time interval of the image:
-1.208000 6.760000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3721  35.2082    8.6  36.6   87.0  -0.1169  -1.3    9.1	Her X-1                       
268.2570  -1.5295    3.5  47.0   28.8   0.2947   3.3    8.1	SW J1753.5-0127               
273.9134 -13.9748 1247.4  54.9   14.4  -0.0013  -0.0    6.5	GX 17+2                       
288.7446  10.9899    5.0  26.1    8.3  -0.0718  -2.3    4.1	GRS 1915+105                  
299.5161  35.0841    7.4   0.1   11.2  -0.0422  -1.5    7.9	Cyg X-1                       
308.2579  40.9898    6.8   8.9 -149.4  -0.0447  -1.7    7.0	Cyg X-3                       
326.3258  38.4117    6.6  21.6 -123.0  -0.0554  -1.7    9.0	Cyg X-2                       
251.9544  71.8183    0.8  44.0  144.1   1.2476  14.7 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
286.652590 534.152610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 45.7745 -39.6117    2.4  35.6  -35.5   1.1747   4.7 ------	UNKNOWN                       
303.3331 -27.4499    3.7  58.7 -159.2   4.3998   3.2 ------	UNKNOWN