Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 20 11:33:32 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger261132
======================================================================

  Trigger: 00261132      Segment: 000

  BAT Trigger Time: 193540217.92   [s; MET]
      Trigger Stop: 193540219.968   [s; MET]
               UTC: 2007-02-19T01:10:16.146540    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 260.198428896005   Dec: 69.3642687369038  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.61
     Image Trigger?:     NO
     Rate S/N Ratio:     14.5945195193264  [ if not an image trigger ]
     Image S/N Ratio:    7.61

  Analysis Position:   [ source = BAT ]
    RA: 260.198428896005   Dec: 69.3642687369038  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 260.198339226429   Dec: 69.3540229151982  [deg; J2000]  
        { 17h 20m 47.6s , +69d 21' 14.5" }
         +/- 1.97146163235189 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.916287772057375 [arcmin] (formal 1-sigma fit error)
    SNR: 11.5343252863869
 
  Angular difference between the analysis and refined position is 0.614752 arcmin
 
  Partial Coding Fraction: 0.921875    [ including projection effects ]

  Duration
     T90: 18 +/- 4.47213595499958
        Measured from: -1.91999998688698
                   to: 16.080000013113     [s; relative to TRIGTIME]
     T50: 8 +/- 2.23606797749979
        Measured from: 1.08000001311302
                   to: 9.08000001311302     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.08000001311302     
                   to: 2.08000001311302     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.91999998688698     
                   to: 19.080000013113     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.230372   0.212262   0.134894   0.035122
           0.023403   0.024034   0.020431   0.017471 [error]
 Peak      0.029651   0.026813   0.013723   0.007442
           0.005344   0.005537   0.004683   0.003885 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   21.000   -1.920   19.080
T90    18.000   -1.920   16.080
T50     8.000    1.080    9.080
Peak    1.000    1.080    2.080
 
 
====== 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      -1.805    -0.226      0.216       -           -               -         1.71e-03     -2.34e-04          2.27e-04      59.520   57
CPL     -1.812    -0.315      0.636     9999.360      N/A           N/A         1.70e-03        N/A               N/A         59.530   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      -1.996     -0.463     0.399       -           -               -         4.12e-03     -1.20e-03          1.12e-03      64.300   57
CPL     -2.068     -0.061     1.503       36.000      N/A           N/A         3.71e-03        N/A               N/A         64.240   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   6.10e-08  9.30e-08  1.06e-07  2.33e-07  3.30e-07  4.93e-07   erg/cm2
      90%_error_low -1.04e-08 -1.04e-08 -2.01e-08 -7.90e-08 -4.54e-08 -1.01e-07   erg/cm2
      90%_error_hi   1.07e-08  1.04e-08  2.03e-08  1.03e-07  4.64e-08  1.20e-07   erg/cm2
Peak flux       PL   2.74e-01  2.06e-01  1.03e-01  7.40e-02  6.17e-01  6.57e-01   ph/cm2/s
      90%_error_low -7.75e-02 -4.22e-02 -3.85e-02 -4.23e-02 -1.24e-01 -1.36e-01   ph/cm2/s
      90%_error_hi   8.12e-02  4.19e-02  3.97e-02  6.67e-02  1.24e-01  1.37e-01   ph/cm2/s
 
Fluence        CPL   6.14e-08  9.20e-08  1.06e-07  2.45e-07  2.81e-07  4.92e-07   erg/cm2
      90%_error_low -1.20e-08 -9.94e-09    N/A       N/A    -5.56e-08 -1.64e-07   erg/cm2
      90%_error_hi   1.11e-08  1.41e-08    N/A       N/A     4.67e-08  5.62e-08   erg/cm2
Peak flux      CPL   2.75e-01  2.05e-01  1.07e-01  9.18e-02  6.20e-01  6.65e-01   ph/cm2/s
      90%_error_low     N/A   -5.39e-02     N/A   -5.07e-02 -1.88e-01 -1.41e-01   ph/cm2/s
      90%_error_hi      N/A    4.58e-02     N/A    2.10e-02  1.23e-01  1.37e-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
  260.1983    69.3540   0.0166    14.3599   130.2724         0.5544809     11.534 TRIG_00261132                 
 
Foreground time interval of the image:
 -1.920  19.080 (delta_t =  21.000 [sec])
Background time interval of the image:
-83.419  -1.920 (delta_t =  81.499 [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   -1.920 sec. to   19.080 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.80522     ( -0.225975   0.216196 )
Norm@50keV  : 1.70559E-03    ( -0.000234389   0.00022747 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.52 using 59 PHA bins.
# Reduced chi-squared =          1.044 for     57 degrees of freedom 
# Null hypothesis probability =   3.839680e-01
 
Photon flux (15-150 keV)    in 21 sec: 0.235516 ( -0.026552  0.026566 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.29723e-07 ( -4.53953e-08  4.64167e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.920 sec. to   19.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.81162     ( -0.316848   0.633532 )
Epeak [keV] : 9999.36      (   )
Norm@50keV  : 1.69941E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.53 using 59 PHA bins.
# Reduced chi-squared =          1.063 for     56 degrees of freedom 
# Null hypothesis probability =   3.485846e-01
 
Photon flux (15-150 keV)    in 21 sec: 0.236440 ( -0.030122  0.030486 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.81274e-07 ( -5.56479e-08  4.66698e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    1.080 sec. to    2.080 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.99615     ( -0.462777   0.399458 )
Norm@50keV  : 4.12314E-03    ( -0.00120373   0.00112288 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.30 using 59 PHA bins.
# Reduced chi-squared =          1.128 for     57 degrees of freedom 
# Null hypothesis probability =   2.363403e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.617425 ( -0.124176  0.124181 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.80224e-08 ( -9.84701e-09  1.03514e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    1.080 sec. to    2.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.06769     ( -0.0606065   1.50264 )
Epeak [keV] : 35.9996      (   )
Norm@50keV  : 3.71103E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.24 using 59 PHA bins.
# Reduced chi-squared =          1.147 for     56 degrees of freedom 
# Null hypothesis probability =   2.101786e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.619609 ( -0.18811  0.123388 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.81601e-08 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 18.0 sec.
Hardness ratio (energy fluence ratio) = 1.14456372944

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

    S(15-50 keV)  = 1.5397637e-07
S(50-150 keV) = 1.7574593e-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 = -1.654912484241922E-01, IMY = -1.953310178599256E-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:
-83.419410 -1.920000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5487  35.1735    8.2  26.1   16.2  -0.1373  -1.4   11.1	Her X-1                       
268.3083  -1.4102    4.9  58.6  -17.7  -1.2849  -2.4    4.4	SW J1753.5-0127               
288.7639  10.9047    2.3  46.9  -44.0   1.3527   5.1    3.2	GRS 1915+105                  
299.5749  35.2194    0.6  26.8  -73.1   2.3115  18.4    1.3	Cyg X-1                       
308.0962  40.9716    1.6  26.0  -93.0   0.8575   7.3    1.3	Cyg X-3                       
326.1791  38.3286   79.1  37.4 -109.1   0.0314   0.1    0.5	Cyg X-2                       
263.1134  24.1479    2.2  34.0   -5.4   0.5564   5.3 ------	UNKNOWN                       
256.8077   4.3892    1.9  54.6   -3.0   1.6922   6.1 ------	UNKNOWN                       
296.7772  46.3833    2.2  16.4  -86.3   0.4752   5.2 ------	UNKNOWN                       
308.0457  37.7277    1.8  28.4  -88.4   0.8713   6.5 ------	UNKNOWN

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

    Time interval of the image:
-1.920000 19.080000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5912  35.1657    0.0  26.1   16.2   0.0386   0.7   12.5	Her X-1                       
268.3580  -1.4132    4.3  58.6  -17.8   0.7737   2.7    2.4	SW J1753.5-0127               
288.6975  10.9400   13.7  46.9  -43.9  -0.1256  -0.8    5.9	GRS 1915+105                  
299.8442  35.1953    0.0  26.9  -73.5   0.1381   2.1   12.5	Cyg X-1                       
308.0075  40.8333   11.7  26.0  -92.7   0.0675   1.0    8.5	Cyg X-3                       
326.2367  38.4778    5.8  37.3 -109.3   0.2282   2.0    9.9	Cyg X-2                       
260.2003  69.3543    1.0  14.4  130.3   0.5531  11.5 ------	UNKNOWN                       
277.4047  13.6497    2.6  43.2  -28.7   0.3676   4.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
66.380600 962.131100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6279  35.3615    5.7  34.1  -12.7  -0.8979  -2.0    8.4	Her X-1                       
299.6074  35.2056    0.8  40.3  -74.1  21.0199  15.2    0.9	Cyg X-1                       
308.0207  40.9678    3.2  37.6  -87.3   5.5022   3.5    4.2	Cyg X-3                       
 46.0435  49.7755    3.2  58.3 -175.6  10.6944   3.6 ------	UNKNOWN                       
 23.7887  57.4179    2.6  46.9 -162.9   3.3471   4.4 ------	UNKNOWN                       
259.9962  17.9218    2.9  51.4  -20.6   4.1150   4.0 ------	UNKNOWN                       
300.3505  38.4930    4.2  37.5  -76.8   2.9960   2.7 ------	UNKNOWN