Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Fri Jan 17 18:31:07 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger421962
======================================================================

  Trigger: 00421962      Segment: 000

  BAT Trigger Time: 295556043.968   [s; MET]
      Trigger Stop: 295556047.04   [s; MET]
               UTC: 2010-05-14T18:53:58.170320    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 328.820890294865   Dec: 29.170486033985  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.06
     Image Trigger?:     NO
     Rate S/N Ratio:     9.64365076099295  [ if not an image trigger ]
     Image S/N Ratio:    7.06

  Analysis Position:   [ source = BAT ]
    RA: 328.820890294865   Dec: 29.170486033985  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 328.76149612411   Dec: 29.1706248836181  [deg; J2000]  
        { 21h 55m 02.8s , +29d 10' 14.2" }
         +/- 2.38409317937589 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.949646049234544 [arcmin] (formal 1-sigma fit error)
    SNR: 8.79194982687489
 
  Angular difference between the analysis and refined position is 3.111693 arcmin
 
  Partial Coding Fraction: 0.765625    [ including projection effects ]

  Duration
     T90: 23.0159999132156 +/- 6.614585413369
        Measured from: 2.24800002574921
                   to: 25.2639999389648     [s; relative to TRIGTIME]
     T50: 8.73599994182587 +/- 5.68785684938173
        Measured from: 3.75200003385544
                   to: 12.4879999756813     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 6.20800000429153     
                   to: 7.20800000429153     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.304000020027161     
                   to: 30.283999979496     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.236004   0.289097   0.172599   0.007115
           0.034181   0.034819   0.030661   0.026034 [error]
 Peak      0.025861   0.034656   0.016038   0.007236
           0.006291   0.006469   0.005722   0.004719 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   29.980    0.304   30.284
T90    23.016    2.248   25.264
T50     8.736    3.752   12.488
Peak    1.000    6.208    7.208
 
 
====== 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      -1.981    -0.261      0.242       -           -               -         1.45e-03     -2.55e-04          2.48e-04      44.110   57
CPL     -0.915    -1.036      1.355       42.508     -25.119        40.989      5.95e-03     -5.95e-03          3.09e-02      40.990   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      -1.876     -0.455     0.407       -           -               -         4.68e-03     -1.39e-03          1.34e-03      50.120   57
CPL     -0.932     -1.518     3.513       46.210      N/A           N/A         1.68e-02        N/A               N/A         49.310   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   8.71e-08  1.20e-07  1.21e-07  2.23e-07  3.99e-07  5.51e-07   erg/cm2
      90%_error_low -1.59e-08 -1.64e-08 -2.83e-08 -8.77e-08 -6.57e-08 -1.24e-07   erg/cm2
      90%_error_hi   1.64e-08  1.64e-08  2.91e-08  1.19e-07  6.76e-08  1.48e-07   erg/cm2
Peak flux       PL   2.77e-01  2.23e-01  1.22e-01  9.70e-02  6.65e-01  7.19e-01   ph/cm2/s
      90%_error_low -8.87e-02 -5.25e-02 -4.54e-02 -5.51e-02 -1.56e-01 -1.72e-01   ph/cm2/s
      90%_error_hi   9.37e-02  5.24e-02  4.69e-02  8.65e-02  1.56e-01  1.74e-01   ph/cm2/s
 
Fluence        CPL   7.94e-08  1.35e-07  1.16e-07  4.73e-08  3.64e-07  3.78e-07   erg/cm2
      90%_error_low -1.84e-08 -2.25e-08 -3.53e-08 -3.76e-08 -6.65e-08 -7.81e-08   erg/cm2
      90%_error_hi   1.83e-08  2.34e-08  3.36e-08  1.63e-07  7.34e-08  1.72e-07   erg/cm2
Peak flux      CPL   2.56e-01  2.50e-01  1.18e-01  2.87e-02  6.46e-01  6.53e-01   ph/cm2/s
      90%_error_low -1.00e-01 -1.18e-01     N/A   -2.87e-02 -1.60e-01 -1.65e-01   ph/cm2/s
      90%_error_hi   1.02e-01  8.10e-02     N/A    9.08e-02  1.60e-01  1.98e-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
  328.7615    29.1706   0.0219    27.7743   -35.1405         0.7010708      8.792 TRIG_00421962                 
 
Foreground time interval of the image:
  0.304  30.284 (delta_t =  29.980 [sec])
Background time interval of the image:
-44.667   0.304 (delta_t =  44.971 [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    0.304 sec. to   30.284 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.98122     ( -0.261079   0.242065 )
Norm@50keV  : 1.44507E-03    ( -0.000254833   0.000248075 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.11 using 59 PHA bins.
# Reduced chi-squared =         0.7738 for     57 degrees of freedom 
# Null hypothesis probability =   8.941584e-01
 
Photon flux (15-150 keV)    in 29.98 sec: 0.214925 ( -0.029092  0.029093 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.99229e-07 ( -6.56628e-08  6.76043e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.304 sec. to   30.284 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.914665     ( -1.03622   1.35453 )
Epeak [keV] : 42.5082      ( -25.1186 40.9887 )
Norm@50keV  : 5.95141E-03    ( -0.00595149   0.0308757 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.99 using 59 PHA bins.
# Reduced chi-squared =         0.7320 for     56 degrees of freedom 
# Null hypothesis probability =   9.338111e-01
 
Photon flux (15-150 keV)    in 29.98 sec: 0.207690 ( -0.029703  0.029803 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.64404e-07 ( -6.64893e-08  7.33919e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    6.208 sec. to    7.208 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.8763     ( -0.455029   0.407094 )
Norm@50keV  : 4.68128E-03    ( -0.00139488   0.00133636 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.12 using 59 PHA bins.
# Reduced chi-squared =         0.8793 for     57 degrees of freedom 
# Null hypothesis probability =   7.286934e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.665195 ( -0.156141  0.156143 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.30418e-08 ( -1.21872e-08  1.28065e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    6.208 sec. to    7.208 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.932457     ( -1.51755   3.51278 )
Epeak [keV] : 46.2099      (   )
Norm@50keV  : 1.67835E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.31 using 59 PHA bins.
# Reduced chi-squared =         0.8805 for     56 degrees of freedom 
# Null hypothesis probability =   7.244005e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.646171 ( -0.159584  0.159992 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.90059e-08 ( -1.29821e-08  1.47431e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 23.016 sec.
Hardness ratio (energy fluence ratio) = 1.01316497429

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

    S(15-50 keV)  = 2.0659516e-07
S(50-150 keV) = 1.9264002e-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 = 4.306790018847859E-01, IMY = 3.031407496949320E-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:
-44.667400 0.304000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5689  35.1995    4.0  34.5  129.3   0.3698   2.9   10.2	Her X-1                       
288.8838  10.9817    5.4  32.4   54.0   0.2438   2.1    5.5	GRS 1915+105                  
299.5822  35.2001    0.5   7.2   28.4   1.6041  22.3    0.4	Cyg X-1                       
308.0353  40.9152    4.0   7.4  -45.5   0.2194   2.9    4.1	Cyg X-3                       
326.0786  38.4443   72.3  21.4  -52.3  -0.0119  -0.2    8.6	Cyg X-2                       
312.9026  -3.9205    2.6  48.1   16.8   0.8129   4.4 ------	UNKNOWN                       
344.2541  14.4666    2.8  48.2  -32.4   0.7153   4.2 ------	UNKNOWN

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

    Time interval of the image:
0.304000 30.284000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4896  35.2062    4.9  34.5  129.4  -0.3108  -2.3    8.3	Her X-1                       
288.8201  11.1245    6.3  32.3   54.1  -0.2198  -1.8   10.8	GRS 1915+105                  
299.6142  35.2450    5.6   7.2   28.1  -0.1417  -2.0    2.9	Cyg X-1                       
308.3789  40.8977    0.0   7.6  -45.9  -0.0431  -0.6   12.6	Cyg X-3                       
326.2245  38.4898    9.7  21.5  -52.6   0.0935   1.2   10.4	Cyg X-2                       
328.7614  29.1706    1.3  27.8  -35.1   0.7009   8.8 ------	UNKNOWN                       
246.1119  81.7751    2.3  43.0 -153.1   0.5883   5.0 ------	UNKNOWN                       
172.8428  79.6703    2.4  54.1 -153.9   1.1896   4.9 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
90.132610 962.106200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5835  35.2019    0.3  25.4  124.8  30.5739  43.8    0.3	Cyg X-1                       
308.0831  40.9854    2.2  20.6  144.1   3.3146   5.4    2.3	Cyg X-3                       
326.1159  38.4042    3.8   9.5 -179.4   1.6974   3.0    5.6	Cyg X-2                       
309.6194  -8.8503    2.6  42.3   42.4   6.2042   4.5 ------	UNKNOWN                       
359.3267  36.3645    3.1  26.5 -100.2   2.4990   3.7 ------	UNKNOWN                       
  0.8967  50.8821    3.4  32.3 -127.7   2.6788   3.4 ------	UNKNOWN                       
 18.9773  41.3452    3.2  42.1 -107.2  10.4706   3.6 ------	UNKNOWN