GRB120211A: 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 06:54:58 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger514586
======================================================================

  Trigger: 00514586      Segment: 000

  BAT Trigger Time: 350654315.968   [s; MET]
      Trigger Stop: 350654324.16   [s; MET]
               UTC: 2012-02-11T11:58:28.088540    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 87.751188537819   Dec: -24.7591984547618  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.93
     Image Trigger?:     NO
     Rate S/N Ratio:     8.24621125123532  [ if not an image trigger ]
     Image S/N Ratio:    7.93

  Analysis Position:   [ source = BAT ]
    RA: 87.751188537819   Dec: -24.7591984547618  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 87.7797455193343   Dec: -24.7911638449394  [deg; J2000]  
        { 05h 51m 07.1s , -24d 47' 28.2" }
         +/- 2.08983859512222 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.16579176176868 [arcmin] (formal 1-sigma fit error)
    SNR: 10.6124206961979
 
  Angular difference between the analysis and refined position is 2.469550 arcmin
 
  Partial Coding Fraction: 0.640625    [ including projection effects ]

  Duration
     T90: 64.3199999928474 +/- 8.83205800550182
        Measured from: -0.375999987125397
                   to: 63.944000005722     [s; relative to TRIGTIME]
     T50: 33.0239999890327 +/- 18.4165491049755
        Measured from: 8.00800001621246
                   to: 41.0320000052452     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 41.0120000243187     
                   to: 42.0120000243187     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.2960000038147     
                   to: 71.688000023365     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.325892   0.428668   0.415169   0.127515
           0.055831   0.057817   0.052402   0.050726 [error]
 Peak      0.020401   0.010884   0.023897   0.006507
           0.006731   0.006769   0.006228   0.006032 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   73.984   -2.296   71.688
T90    64.320   -0.376   63.944
T50    33.024    8.008   41.032
Peak    1.000   41.012   42.012
 
 
====== 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      -1.413    -0.224      0.223       -           -               -         1.21e-03     -1.60e-04          1.59e-04      47.930   57
CPL     -0.576    -0.921      1.263       84.835     -24.094       -84.835      3.19e-03     -3.19e-03          9.89e-03      45.860   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      -1.445     -0.672     0.672       -           -               -         3.77e-03     -1.42e-03          1.38e-03      56.420   57
CPL     -1.108      N/A       N/A         129.773      N/A           N/A         5.62e-03        N/A               N/A         56.410   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   1.05e-07  2.04e-07  3.06e-07  9.96e-07  8.62e-07  1.61e-06   erg/cm2
      90%_error_low -2.27e-08 -2.81e-08 -5.19e-08 -3.17e-07 -1.26e-07 -3.64e-07   erg/cm2
      90%_error_hi   2.40e-08  2.78e-08  5.16e-08  4.06e-07  1.28e-07  4.38e-07   erg/cm2
Peak flux       PL   1.47e-01  1.53e-01  1.12e-01  1.33e-01  4.64e-01  5.46e-01   ph/cm2/s
      90%_error_low -8.32e-02 -6.05e-02 -5.22e-02 -9.19e-02 -1.68e-01 -1.99e-01   ph/cm2/s
      90%_error_hi   9.82e-02  5.82e-02  5.14e-02  1.76e-01  1.69e-01  2.06e-01   ph/cm2/s
 
Fluence        CPL   9.12e-08  2.21e-07  3.20e-07  3.31e-07  8.06e-07  9.64e-07   erg/cm2
      90%_error_low -2.86e-08 -3.48e-08 -5.80e-08 -2.23e-07 -1.40e-07 -2.64e-07   erg/cm2
      90%_error_hi   2.91e-08  3.64e-08  5.91e-08  7.77e-07  1.44e-07  4.61e-07   erg/cm2
Peak flux      CPL   1.43e-01  1.56e-01  1.14e-01  1.04e-01  4.60e-01  5.17e-01   ph/cm2/s
      90%_error_low -5.47e-02 -6.31e-02 -5.36e-02 -1.04e-01 -1.73e-01 -2.20e-01   ph/cm2/s
      90%_error_hi   1.02e-01  6.95e-02  5.89e-02  1.18e-01  1.72e-01  2.28e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   87.7797   -24.7912   0.0181    32.2416  -141.7938         1.0141090     10.612 TRIG_00514586                 
 
Foreground time interval of the image:
 -2.296  50.133 (delta_t =  52.429 [sec])
Background time interval of the image:
-566.567 -546.830 (delta_t =  19.737 [sec])
-239.968  -2.296 (delta_t = 237.672 [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   -2.296 sec. to   71.688 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.41329     ( -0.224352   0.223277 )
Norm@50keV  : 1.20912E-03    ( -0.000160086   0.000159319 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.93 using 59 PHA bins.
# Reduced chi-squared =         0.8410 for     57 degrees of freedom 
# Null hypothesis probability =   7.982454e-01
 
Photon flux (15-150 keV)    in 73.98 sec: 0.147701 ( -0.019436  0.019468 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.62133e-07 ( -1.26089e-07  1.27842e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -2.296 sec. to   71.688 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.575677     ( -0.921908   1.26289 )
Epeak [keV] : 84.8346      ( -24.0679 -84.8079 )
Norm@50keV  : 3.19071E-03    ( -0.00319325   0.00988342 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.86 using 59 PHA bins.
# Reduced chi-squared =         0.8188 for     56 degrees of freedom 
# Null hypothesis probability =   8.313351e-01
 
Photon flux (15-150 keV)    in 73.98 sec: 0.142127 ( -0.020783  0.020625 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.0633e-07 ( -1.39655e-07  1.43737e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   41.012 sec. to   42.012 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.44507     ( -0.672477   0.672446 )
Norm@50keV  : 3.76973E-03    ( -0.00141928   0.0013806 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.42 using 59 PHA bins.
# Reduced chi-squared =         0.9898 for     57 degrees of freedom 
# Null hypothesis probability =   4.969213e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.464012 ( -0.16846  0.169326 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.6111e-08 ( -1.44833e-08  1.51622e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   41.012 sec. to   42.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.10847     (       )
Epeak [keV] : 129.773      (   )
Norm@50keV  : 5.62007E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.41 using 59 PHA bins.
# Reduced chi-squared =          1.007 for     56 degrees of freedom 
# Null hypothesis probability =   4.596754e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.460207 ( -0.173168  0.172059 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.55189e-08 ( -1.54622e-08  1.55892e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 64.32 sec.
Hardness ratio (energy fluence ratio) = 1.50186205365

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

S(15-50 keV)  = 3.093577e-07
S(50-150 keV) = 5.527646e-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 = -4.956360947873087E-01, IMY = 3.901141554868550E-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:
-566.567360 -546.830400
-239.968000 -2.296000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6321  22.0200    0.2  21.5  -19.3  10.4707  53.0    0.3	Crab                          
109.2785 -41.4897    2.1  48.4 -170.8   2.1773   5.4 ------	UNKNOWN                       
 70.5319 -34.4407    2.9  48.0 -128.7   3.7622   4.0 ------	UNKNOWN                       

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

Time interval of the image:
-2.296000 50.132600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.8325  21.9364    0.0  21.3  -19.1  -0.0855  -1.1   12.0	Crab                          
131.6890 -28.7638    2.3  47.3  159.1   1.0239   5.2 ------	UNKNOWN                       
 86.5394  45.8503    2.2  41.3    8.0   0.6592   5.3 ------	UNKNOWN                       
 87.7797 -24.7911    1.1  32.2 -141.8   1.0129  10.6 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
103.332590 962.101300
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6322  22.0218    0.5  46.9   23.7  31.1518  22.4    0.4	Crab                          
135.6637 -40.6668  223.4  42.7  152.9   0.0495   0.1    9.1	Vela X-1                      
 95.4036  23.2670    2.5  48.6   38.3   9.6699   4.5 ------	UNKNOWN                       
150.9449 -67.0901    4.2  57.0 -175.6   6.3875   2.7 ------	UNKNOWN                       
 78.1952 -49.9974    3.1  26.3 -137.1   1.6918   3.7 ------	UNKNOWN                       
149.4415 -75.3557    3.1  59.1 -166.1  13.0184   3.8 ------	UNKNOWN                       
 60.1098 -34.6271    3.0  25.9  -90.0   2.0087   3.9 ------	UNKNOWN