GRB110223A

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This batgrbproduct analysis is done using the HEASARC data.
3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jun 14 02:42:48 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger446674
======================================================================

  Trigger: 00446674      Segment: 000

  BAT Trigger Time: 320187425.92   [s; MET]
      Trigger Stop: 320187427.968   [s; MET]
               UTC: 2011-02-23T20:56:59.226720    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 345.599224203527   Dec: 87.5675078814022  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.37
     Image Trigger?:     NO
     Rate S/N Ratio:     9.89949493661167  [ if not an image trigger ]
     Image S/N Ratio:    7.37

  Analysis Position:   [ source = BAT ]
    RA: 345.599224203527   Dec: 87.5675078814022  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 345.477174596784   Dec: 87.588203667138  [deg; J2000]  
        { 23h 01m 54.5s , +87d 35' 17.5" }
         +/- 2.50700517246376 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.73983045137516 [arcmin] (formal 1-sigma fit error)
    SNR: 8.18269988308016
 
  Angular difference between the analysis and refined position is 1.279732 arcmin
 
  Partial Coding Fraction: 0.6015625    [ including projection effects ]

  Duration
     T90: 7 +/- 2.23606797749979
        Measured from: 0.0799999833106995
                   to: 7.0799999833107     [s; relative to TRIGTIME]
     T50: 4 +/- 2
        Measured from: 0.0799999833106995
                   to: 4.0799999833107     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0799999833106995     
                   to: 1.0799999833107     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.0799999833106995     
                   to: 8.0799999833107     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.077786   0.118965   0.070202   0.007867
           0.017963   0.018682   0.016882   0.015137 [error]
 Peak      0.023225   0.029818   0.026211   0.004813
           0.006644   0.006775   0.006307   0.005627 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    8.000    0.080    8.080
T90     7.000    0.080    7.080
T50     4.000    0.080    4.080
Peak    1.000    0.080    1.080
 
 
====== 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      -1.583    -0.335      0.322       -           -               -         2.22e-03     -4.73e-04          4.63e-04      40.020   57
CPL     -0.671    -1.306      1.709       65.158     -21.347       -65.158      7.09e-03     -7.09e-03          5.63e-02      38.500   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      -1.664     -0.492     0.441       -           -               -         4.73e-03     -1.42e-03          1.36e-03      52.800   57
CPL     -0.820     -1.425     2.370       68.920      N/A           N/A         1.28e-02        N/A               N/A         52.030   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   2.45e-08  4.29e-08  5.72e-08  1.56e-07  1.67e-07  2.81e-07   erg/cm2
      90%_error_low -6.89e-09 -8.28e-09 -1.58e-08 -7.26e-08 -3.77e-08 -9.06e-08   erg/cm2
      90%_error_hi   7.27e-09  8.26e-09  1.60e-08  1.06e-07  3.89e-08  1.18e-07   erg/cm2
Peak flux       PL   2.28e-01  2.08e-01  1.31e-01  1.27e-01  6.20e-01  6.94e-01   ph/cm2/s
      90%_error_low -8.41e-02 -5.38e-02 -5.00e-02 -7.46e-02 -1.59e-01 -1.84e-01   ph/cm2/s
      90%_error_hi   9.21e-02  5.36e-02  5.01e-02  1.17e-01  1.59e-01  1.88e-01   ph/cm2/s
 
Fluence        CPL   2.23e-08  4.79e-08  5.73e-08  4.07e-08  1.52e-07  1.68e-07   erg/cm2
      90%_error_low -7.87e-09 -1.08e-08 -1.95e-08    N/A    -3.99e-08 -5.45e-08   erg/cm2
      90%_error_hi   8.01e-09  1.15e-08  1.83e-08    N/A     4.33e-08  1.58e-07   erg/cm2
Peak flux      CPL   1.98e-01  2.26e-01  1.41e-01  5.62e-02  6.02e-01  6.19e-01   ph/cm2/s
      90%_error_low -1.98e-01 -6.34e-02 -5.65e-02 -5.62e-02 -1.63e-01 -1.76e-01   ph/cm2/s
      90%_error_hi   1.08e-01  6.77e-02  6.02e-02  1.06e-01  1.63e-01  1.97e-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
  345.4772    87.5882   0.0235    23.6089    66.1071         0.2939093      8.183 TRIG_00446674                 
 
Foreground time interval of the image:
  0.080   8.080 (delta_t =   8.000 [sec])
Background time interval of the image:
-239.920   0.080 (delta_t = 240.000 [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:

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve

Spectra

Notes:

1) The fitting includes the systematic errors.
2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.

Time averaged spectrum fit using the average DRM

Power-law model

Time interval is from    0.080 sec. to    8.080 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.58323     ( -0.334499   0.321612 )
Norm@50keV  : 2.22185E-03    ( -0.00047321   0.000462926 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.02 using 59 PHA bins.
# Reduced chi-squared =         0.7022 for     57 degrees of freedom 
# Null hypothesis probability =   9.571332e-01
 
Photon flux (15-150 keV)    in 8 sec: 0.284065 ( -0.054573  0.054593 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.66602e-07 ( -3.7655e-08  3.88738e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.080 sec. to    8.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.670849     ( -1.30588   1.70922 )
Epeak [keV] : 65.1582      ( -21.3473 -65.1582 )
Norm@50keV  : 7.08904E-03    ( -0.00708903   0.0563317 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.50 using 59 PHA bins.
# Reduced chi-squared =         0.6875 for     56 degrees of freedom 
# Null hypothesis probability =   9.641785e-01
 
Photon flux (15-150 keV)    in 8 sec: 0.275192 ( -0.055587  0.05583 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.52262e-07 ( -3.98503e-08  4.32714e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.080 sec. to    1.080 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.66426     ( -0.492389   0.441077 )
Norm@50keV  : 4.72808E-03    ( -0.00142397   0.0013612 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.80 using 59 PHA bins.
# Reduced chi-squared =         0.9263 for     57 degrees of freedom 
# Null hypothesis probability =   6.333445e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.620331 ( -0.159192  0.159218 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.39177e-08 ( -1.34899e-08  1.41093e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.080 sec. to    1.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.820282     ( -1.42526   2.36988 )
Epeak [keV] : 68.9196      (   )
Norm@50keV  : 1.28271E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.03 using 59 PHA bins.
# Reduced chi-squared =         0.9291 for     56 degrees of freedom 
# Null hypothesis probability =   6.259883e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.602144 ( -0.162552  0.1631 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.19411e-08 ( -1.33395e-08  1.45162e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 7.0 sec.
Hardness ratio (energy fluence ratio) = 1.33490388635

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

S(15-50 keV)  = 6.740376e-08
S(50-150 keV) = 9.919803e-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 = 1.770268091758329E-01, IMY = -3.996183056345154E-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:
-239.920000 0.080000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5978  35.2016    1.7  48.8  -24.7   3.0065   6.9    0.4	Cyg X-1                       
308.1064  41.0827   10.4  40.2  -28.0   0.3070   1.1    7.8	Cyg X-3                       
325.9489  38.4344    8.2  35.0  -49.4   0.3811   1.4   12.5	Cyg X-2                       
 53.2042  29.9159    2.8  45.0 -175.2   1.2880   4.2 ------	UNKNOWN                       
 34.0339  12.3620    4.8  55.3 -145.2   2.8411   2.5 ------	UNKNOWN

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

Time interval of the image:
0.080000 8.080000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5012  35.0684   11.7  48.9  -24.7   0.0601   1.0    9.1	Cyg X-1                       
308.2614  40.8726    2.9  40.3  -28.3  -0.1687  -4.0    8.4	Cyg X-3                       
326.1067  38.3257   12.0  35.0  -49.6  -0.0411  -1.0    3.1	Cyg X-2                       
345.4767  87.5881    1.4  23.6   66.1   0.2938   8.2 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
77.780600 302.140000
360.080000 680.480600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4618  35.2971    6.9  54.8   -5.8   0.8994   1.7    2.7	Her X-1                       
 77.9517  35.2636    2.8  54.9  167.3   3.3820   4.1 ------	UNKNOWN                       
308.5030  43.1826    2.8  44.9  -60.1   3.1526   4.1 ------	UNKNOWN

Analysis Summary

Notes:

Image

Pre-slew 15.0-350.0 keV image (Event data)

Light Curves

Full-time range; 1 s binning

Other quick-look light curves:

64 ms binning (zoomed) 16 ms binning (zoomed) 8 ms binning (zoomed) 2 ms binning (zoomed) SN=5 or 10 s binning (full-time range) Raw light curve

Spectra

Notes:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

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

Mask shadow pattern

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

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

Post-slew image of 15-350 keV band

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve