GRB121024A: 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: Sun Jan 12 23:51:04 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger536580
======================================================================

  Trigger: 00536580      Segment: 000

  BAT Trigger Time: 372740182.272   [s; MET]
      Trigger Stop: 372740183.68   [s; MET]
               UTC: 2012-10-24T02:56:12.478460    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 70.4670677361895   Dec: -12.2687432432442  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.16
     Image Trigger?:     NO
     Rate S/N Ratio:     21.9317121994613  [ if not an image trigger ]
     Image S/N Ratio:    9.16

  Analysis Position:   [ source = BAT ]
    RA: 70.4670677361895   Dec: -12.2687432432442  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 70.4826974334768   Dec: -12.2552203982717  [deg; J2000]  
        { 04h 41m 55.8s , -12d 15' 18.8" }
         +/- 1.66846556110784 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.747027519324135 [arcmin] (formal 1-sigma fit error)
    SNR: 14.6393674965011
 
  Angular difference between the analysis and refined position is 1.223965 arcmin
 
  Partial Coding Fraction: 0.5    [ including projection effects ]

  Duration
     T90: 67.9679999947548 +/- 31.7236708593267
        Measured from: -7.33600002527237
                   to: 60.6319999694824     [s; relative to TRIGTIME]
     T50: 11.7760000228882 +/- 15.081237066697
        Measured from: -1.57600003480911
                   to: 10.1999999880791     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.643999993801117     
                   to: 1.64399999380112     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -8.2960000038147     
                   to: 74.0719999670982     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.488063   0.573817   0.468605   0.158298
           0.064513   0.067286   0.061810   0.059663 [error]
 Peak      0.035364   0.058099   0.059512   0.028432
           0.008483   0.009596   0.009358   0.008677 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   82.368   -8.296   74.072
T90    67.968   -7.336   60.632
T50    11.776   -1.576   10.200
Peak    1.000    0.644    1.644
 
 
====== 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      -1.322    -0.220      0.223       -           -               -         1.36e-03     -1.62e-04          1.61e-04      59.110   57
CPL     -1.321    -0.219      0.378     9999.360    -9999.360      -9999.360      1.36e-03     -1.36e-03          8.47e-04      59.130   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      -1.069     -0.300     0.312       -           -               -         1.18e-02     -1.89e-03          1.89e-03      57.880   57
CPL     -1.077     -0.290     0.425     9999.320    -9999.320      -9999.320      1.19e-02     -1.90e-03          1.90e-03      57.910   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   1.21e-07  2.47e-07  3.96e-07  1.41e-06  1.10e-06  2.18e-06   erg/cm2
      90%_error_low -2.57e-08 -3.19e-08 -6.19e-08 -4.35e-07 -1.50e-07 -4.86e-07   erg/cm2
      90%_error_hi   2.71e-08  3.13e-08  6.12e-08  5.63e-07  1.52e-07  5.95e-07   erg/cm2
Peak flux       PL   3.23e-01  4.20e-01  4.00e-01  6.77e-01  1.37e+00  1.82e+00   ph/cm2/s
      90%_error_low -1.02e-01 -8.35e-02 -7.63e-02 -2.47e-01 -2.22e-01 -3.23e-01   ph/cm2/s
      90%_error_hi   1.12e-01  8.03e-02  7.43e-02  3.32e-01  2.23e-01  3.46e-01   ph/cm2/s
 
Fluence        CPL   1.23e-07  2.44e-07  3.92e-07  1.43e-06  1.11e-06  2.07e-06   erg/cm2
      90%_error_low    N/A    -3.97e-08    N/A    -7.87e-07 -2.09e-07 -6.72e-07   erg/cm2
      90%_error_hi     N/A     4.73e-08    N/A     5.58e-07  1.94e-07  6.78e-07   erg/cm2
Peak flux      CPL   3.23e-01  4.20e-01  4.00e-01  6.71e-01  1.38e+00  1.83e+00   ph/cm2/s
      90%_error_low     N/A   -8.43e-02     N/A       N/A   -2.36e-01 -4.22e-01   ph/cm2/s
      90%_error_hi      N/A    8.13e-02     N/A       N/A    2.10e-01  1.79e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   70.4827   -12.2552   0.0131    25.9087   112.3782         1.5030198     14.639 TRIG_00536580                 
 
Foreground time interval of the image:
 -8.296  29.029 (delta_t =  37.325 [sec])
Background time interval of the image:
-202.371  -8.296 (delta_t = 194.075 [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   -8.296 sec. to   74.072 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.32212     ( -0.220363   0.222576 )
Norm@50keV  : 1.35570E-03    ( -0.000161861   0.00016117 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.11 using 59 PHA bins.
# Reduced chi-squared =          1.037 for     57 degrees of freedom 
# Null hypothesis probability =   3.982528e-01
 
Photon flux (15-150 keV)    in 82.37 sec: 0.162418 ( -0.01938  0.019421 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.09779e-06 ( -1.49894e-07  1.52096e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -8.296 sec. to   74.072 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.32148     ( -0.21919   0.37797 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 1.36064E-03    ( -0.00136071   0.000847075 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.13 using 59 PHA bins.
# Reduced chi-squared =          1.056 for     56 degrees of freedom 
# Null hypothesis probability =   3.619682e-01
 
Photon flux (15-150 keV)    in 82.37 sec: 0.163673 ( -0.027836  0.025287 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.10688e-06 ( -2.09246e-07  1.94006e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.644 sec. to    1.644 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.06926     ( -0.300485   0.311629 )
Norm@50keV  : 1.18336E-02    ( -0.00189477   0.00189335 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.88 using 59 PHA bins.
# Reduced chi-squared =          1.016 for     57 degrees of freedom 
# Null hypothesis probability =   4.424354e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.36882 ( -0.2225  0.223 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.24977e-07 ( -2.30217e-08  2.33226e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.644 sec. to    1.644 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.07656     ( -0.291321   0.42398 )
Epeak [keV] : 9999.32      ( -9999.35 -9999.35 )
Norm@50keV  : 1.18985E-02    ( -0.00190197   0.00190348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.91 using 59 PHA bins.
# Reduced chi-squared =          1.034 for     56 degrees of freedom 
# Null hypothesis probability =   4.047921e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.38154 ( -0.2357  0.20986 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.25617e-07 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 67.968 sec.
Hardness ratio (energy fluence ratio) = 1.59985229017

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

S(15-50 keV)  = 3.680996e-07
S(50-150 keV) = 7.296916e-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 = -1.849384243682249E-01, IMY = -4.491802623731363E-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:
-202.371400 -8.296000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6550 -40.7005   13.9  42.4 -110.9   0.7443   0.8   10.5	Vela X-1                      
 45.9876 -11.8437    2.7  39.8   75.2   3.2313   4.3 ------	UNKNOWN                       
101.5159 -59.4350    2.4  26.6  -67.8   1.0239   4.8 ------	UNKNOWN                       
131.4721  -0.9178    4.2  58.7 -159.3   3.2039   2.8 ------	UNKNOWN                       

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

Time interval of the image:
-8.296000 29.028580
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4003 -40.6498    7.7  42.2 -111.1  -0.4264  -1.5    8.2	Vela X-1                      
 25.0928 -26.6538    2.5  47.8   41.2   1.5430   4.6 ------	UNKNOWN                       
 70.4827 -12.2552    0.8  25.9  112.4   1.5028  14.6 ------	UNKNOWN                       
 80.4024 -27.8811    2.1   8.6  133.8   0.3851   5.4 ------	UNKNOWN                       
358.8342 -59.6017    2.5  55.3   -6.5   1.1498   4.6 ------	UNKNOWN                       
122.4259 -43.7122    2.3  32.3 -108.0   0.5498   5.0 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
81.628590 679.528600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6244  22.0186    0.3  36.7  172.1  23.8301  39.0    0.5	Crab                          
 26.1667 -41.0803    2.9  48.2   16.4   4.4034   3.9 ------	UNKNOWN                       
116.5451  25.6893    3.5  58.8 -159.2   9.3850   3.3 ------	UNKNOWN                       
 59.1574 -70.7769    4.8  58.9  -24.3   9.0830   2.4 ------	UNKNOWN                       
 63.2784 -70.8676    3.2  58.7  -25.8  12.7232   3.6 ------	UNKNOWN                       
119.6492  13.5274    8.4  55.2 -144.9   4.1362   1.4 ------	UNKNOWN                       
 93.4911 -61.6342    4.6  52.1  -42.2   6.3582   2.5 ------	UNKNOWN                       
117.6997   0.4169    2.7  48.5 -130.3   8.0827   4.3 ------	UNKNOWN