GRB110223B: Summary Image Light curves Spectra Distribution Others

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: Mon Jan 13 23:58:08 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger446677
======================================================================

  Trigger: 00446677      Segment: 000

  BAT Trigger Time: 320189154.752   [s; MET]
      Trigger Stop: 320189156.8   [s; MET]
               UTC: 2011-02-23T21:25:48.058660    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 150.275688090159   Dec: -68.3291791093942  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.1
     Image Trigger?:     NO
     Rate S/N Ratio:     15.5884572681199  [ if not an image trigger ]
     Image S/N Ratio:    7.1

  Analysis Position:   [ source = BAT ]
    RA: 150.275688090159   Dec: -68.3291791093942  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 150.318007935747   Dec: -68.3146242604098  [deg; J2000]  
        { 10h 01m 16.3s , -68d 18' 52.6" }
         +/- 1.73154649497643 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.803004393754581 [arcmin] (formal 1-sigma fit error)
    SNR: 13.8834741139095
 
  Angular difference between the analysis and refined position is 1.281561 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 61.4479999542236 +/- 11.0534042221947
        Measured from: -44.8359999656677
                   to: 16.6119999885559     [s; relative to TRIGTIME]
     T50: 29.9439999461174 +/- 8.65394522916218
        Measured from: -28.3679999709129
                   to: 1.57599997520447     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.992000043392181     
                   to: 1.99200004339218     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -45.7919999957085     
                   to: 19.3120000362396     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.373618   0.395527   0.253725   0.087981
           0.039551   0.040286   0.035636   0.031561 [error]
 Peak      0.019733   0.015329   0.034519   0.005089
           0.005144   0.005387   0.004851   0.004079 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   65.104  -45.792   19.312
T90    61.448  -44.836   16.612
T50    29.944  -28.368    1.576
Peak    1.000    0.992    1.992
 
 
====== 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      -1.652    -0.212      0.206       -           -               -         1.01e-03     -1.25e-04          1.22e-04      50.600   57
CPL     -1.651    -0.213      0.208     9999.360    -9999.350      -9999.360      1.01e-03     -7.84e-04          -2.90e-04      50.610   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      -1.080     -0.383     0.395       -           -               -         5.04e-03     -9.98e-04          9.95e-04      67.630   57
CPL     -1.072     -0.388     0.396     9999.360    -9999.360      -9999.360      5.07e-03     -9.96e-04          1.02e-02      67.640   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   9.68e-08  1.62e-07  2.06e-07  5.26e-07  6.11e-07  9.91e-07   erg/cm2
      90%_error_low -1.66e-08 -1.76e-08 -3.51e-08 -1.66e-07 -8.04e-08 -2.01e-07   erg/cm2
      90%_error_hi   1.72e-08  1.75e-08  3.52e-08  2.13e-07  8.21e-08  2.40e-07   erg/cm2
Peak flux       PL   1.39e-01  1.80e-01  1.70e-01  2.84e-01  5.84e-01  7.72e-01   ph/cm2/s
      90%_error_low -5.48e-02 -4.59e-02 -3.91e-02 -1.24e-01 -1.19e-01 -1.64e-01   ph/cm2/s
      90%_error_hi   6.37e-02  4.38e-02  3.77e-02  1.75e-01  1.19e-01  1.75e-01   ph/cm2/s
 
Fluence        CPL   9.87e-08  1.59e-07  1.39e-07  5.85e-07  6.17e-07  9.78e-07   erg/cm2
      90%_error_low -8.72e-09 -2.24e-08 -3.09e-08 -3.42e-07 -8.69e-08 -2.80e-07   erg/cm2
      90%_error_hi   2.28e-08  3.04e-08  1.52e-08  3.48e-08  7.55e-08  1.79e-07   erg/cm2
Peak flux      CPL   1.39e-01  1.80e-01  1.70e-01  2.82e-01  5.83e-01  8.07e-01   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  150.3180   -68.3146   0.0139     8.6355   173.3767         1.0596356     13.883 TRIG_00446677                 
 
Foreground time interval of the image:
-45.792  19.312 (delta_t =  65.104 [sec])
Background time interval of the image:
-239.752 -45.792 (delta_t = 193.960 [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

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  -45.792 sec. to   19.312 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.65211     ( -0.211822   0.20646 )
Norm@50keV  : 1.00924E-03    ( -0.000124899   0.000121976 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.60 using 59 PHA bins.
# Reduced chi-squared =         0.8877 for     57 degrees of freedom 
# Null hypothesis probability =   7.124045e-01
 
Photon flux (15-150 keV)    in 65.1 sec: 0.131878 ( -0.014262  0.014271 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.11e-07 ( -8.04441e-08  8.2108e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -45.792 sec. to   19.312 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.34026     ( -0.212691   0.207772 )
Epeak [keV] : 121.196      ( -9999.35 -9999.36 )
Norm@50keV  : 4.49728E-04    ( -0.000222765   0.000271684 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.31 using 59 PHA bins.
# Reduced chi-squared =         0.8805 for     56 degrees of freedom 
# Null hypothesis probability =   7.244030e-01
 
Photon flux (15-150 keV)    in 65.1 sec: 0.132108 ( -0.01477  0.014222 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.17335e-07 ( -8.69013e-08  7.54704e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.992 sec. to    1.992 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.08048     ( -0.382626   0.39534 )
Norm@50keV  : 5.03971E-03    ( -0.000997909   0.000994747 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.63 using 59 PHA bins.
# Reduced chi-squared =          1.186 for     57 degrees of freedom 
# Null hypothesis probability =   1.583756e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.583516 ( -0.118698  0.119103 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.30298e-08 ( -1.17013e-08  1.18157e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.992 sec. to    1.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.07203     ( -0.387636   0.396212 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 5.06610E-03    ( -0.000995881   0.0101882 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.64 using 59 PHA bins.
# Reduced chi-squared =          1.208 for     56 degrees of freedom 
# Null hypothesis probability =   1.370855e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.583426 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.3108e-08 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 61.448 sec.
Hardness ratio (energy fluence ratio) = 1.27274140679

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

S(15-50 keV)  = 2.5886548e-07
S(50-150 keV) = 3.521362e-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 = -1.508559943812539E-01, IMY = -1.751670764535747E-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:
-239.752000 -45.792000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5537 -40.5808    3.1  27.1   80.1   0.8270   3.8    1.9	Vela X-1                      
170.0815 -60.5046   43.6  19.5  156.6   0.0412   0.3    9.9	Cen X-3                       
186.7236 -62.9111    9.1  24.3  174.6   0.2020   1.3    8.6	GX 301-2                      
146.6697 -58.4223    2.8  12.4  119.9   0.6096   4.1 ------	UNKNOWN                       
223.2412 -65.1816    2.5  34.8 -160.6   0.8107   4.6 ------	UNKNOWN                       
 64.3081 -32.3966    2.8  50.1  -12.6   1.4350   4.0 ------	UNKNOWN                       
 33.9283 -46.8648    2.8  48.9  -48.6   3.5007   4.1 ------	UNKNOWN                       

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

Time interval of the image:
-45.792000 19.312000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4601 -40.4603    3.6  27.3   79.9   0.4136   3.3    6.5	Vela X-1                      
170.6944 -60.7227    0.0  19.6  157.7   0.2997   3.3   12.6	Cen X-3                       
186.9413 -62.6977    5.4  24.5  174.3   0.1991   2.1    9.0	GX 301-2                      
175.5820 -48.9668    2.3  30.1  143.4   0.5943   5.1 ------	UNKNOWN                       
150.3180 -68.3146    0.8   8.6  173.4   1.0595  13.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
56.148600 302.311100
480.248000 542.280800
660.248000 722.292800
840.248000 902.295700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5169 -40.6132    2.8  28.8   60.1   1.7178   4.2    3.6	Vela X-1                      
170.0042 -60.6204    5.5  11.4  140.8   0.5773   2.1    9.2	Cen X-3                       
186.3571 -62.8317   35.9  15.6  170.6   0.0919   0.3    9.0	GX 301-2                      
 98.7769 -80.1723    2.4  17.3  -69.6   1.4951   4.8 ------	UNKNOWN                       
355.1511 -69.6578    2.5  41.0  -83.5   6.4650   4.5 ------	UNKNOWN