GRB110412A

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 23:04:16 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger451191
======================================================================

  Trigger: 00451191      Segment: 000

  BAT Trigger Time: 324286408   [s; MET]
      Trigger Stop: 324286488   [s; MET]
               UTC: 2011-04-12T07:33:21.152460    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 133.491854211323   Dec: 13.5166846952985  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.83
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    8.83

  Analysis Position:   [ source = BAT ]
    RA: 133.491854211323   Dec: 13.5166846952985  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 133.49169728859   Dec: 13.4874688089571  [deg; J2000]  
        { 08h 53m 58.0s , +13d 29' 14.9" }
         +/- 1.89268400535467 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.767274675406786 [arcmin] (formal 1-sigma fit error)
    SNR: 12.2262284289314
 
  Angular difference between the analysis and refined position is 1.752977 arcmin
 
  Partial Coding Fraction: 0.1894531    [ including projection effects ]

  Duration
     T90: 24 +/- 4.48325596002306
        Measured from: 14.6000000238419
                   to: 38.6000000238419     [s; relative to TRIGTIME]
     T50: 8.96000003814697 +/- 1.83916499624357
        Measured from: 18.3600000143051
                   to: 27.3200000524521     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 19.0040000081062     
                   to: 20.0040000081062     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 13.6560000181198     
                   to: 40.8880000114441     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.709616   1.163324   0.753439   0.201887
           0.071859   0.076451   0.069989   0.065841 [error]
 Peak      0.062485   0.077213   0.112712   0.005373
           0.014191   0.016508   0.014963   0.012946 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   27.232   13.656   40.888
T90    24.000   14.600   38.600
T50     8.960   18.360   27.320
Peak    1.000   19.004   20.004
 
 
====== 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      -1.537    -0.136      0.135       -           -               -         6.96e-03     -5.80e-04          5.77e-04      66.010   57
CPL     -0.776    -0.571      0.669       74.752     -17.033        81.665      1.78e-02     -8.84e-03          2.25e-02      60.580   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      -1.196     -0.296     0.308       -           -               -         1.76e-02     -3.13e-03          3.12e-03      66.460   57
CPL     -0.754     -0.685     1.400      154.778    -154.778      -154.778      2.83e-02        N/A               N/A         66.000   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   2.51e-07  4.50e-07  6.20e-07  1.78e-06  1.79e-06  3.10e-06   erg/cm2
      90%_error_low -3.20e-08 -3.69e-08 -6.71e-08 -3.70e-07 -1.62e-07 -4.33e-07   erg/cm2
      90%_error_hi   3.29e-08  3.68e-08  6.71e-08  4.32e-07  1.63e-07  4.82e-07   erg/cm2
Peak flux       PL   5.41e-01  6.52e-01  5.69e-01  8.52e-01  2.06e+00  2.61e+00   ph/cm2/s
      90%_error_low -1.74e-01 -1.39e-01 -1.15e-01 -3.11e-01 -3.79e-01 -4.81e-01   ph/cm2/s
      90%_error_hi   1.92e-01  1.36e-01  1.13e-01  4.09e-01  3.80e-01  4.92e-01   ph/cm2/s
 
Fluence        CPL   2.27e-07  4.91e-07  6.31e-07  5.80e-07  1.66e-06  1.93e-06   erg/cm2
      90%_error_low -3.68e-08 -4.81e-08 -7.63e-08 -3.09e-07 -1.85e-07 -3.60e-07   erg/cm2
      90%_error_hi   3.73e-08  4.99e-08  7.52e-08  7.10e-07  1.88e-07  7.15e-07   erg/cm2
Peak flux      CPL   4.90e-01  6.75e-01  6.00e-01  5.48e-01  2.03e+00  2.31e+00   ph/cm2/s
      90%_error_low -2.17e-01 -1.51e-01 -1.35e-01 -5.48e-01 -3.91e-01 -6.34e-01   ph/cm2/s
      90%_error_hi   2.25e-01  1.57e-01  1.42e-01  4.21e-01  3.88e-01  6.32e-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
  133.4917    13.4875   0.0158    35.5498    74.6875         3.0274022     12.226 TRIG_00451191                 
 
Foreground time interval of the image:
 13.656  40.888 (delta_t =  27.232 [sec])
Background time interval of the image:
 -1.699  13.656 (delta_t =  15.355 [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   13.656 sec. to   40.888 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.53709     ( -0.135966   0.13488 )
Norm@50keV  : 6.95965E-03    ( -0.000579898   0.00057673 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.01 using 59 PHA bins.
# Reduced chi-squared =          1.158 for     57 degrees of freedom 
# Null hypothesis probability =   1.936363e-01
 
Photon flux (15-150 keV)    in 27.23 sec: 0.877821 ( -0.070774  0.070834 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.78767e-06 ( -1.61532e-07  1.63286e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   13.656 sec. to   40.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.775572     ( -0.570903   0.66936 )
Epeak [keV] : 74.7516      ( -17.0334 81.6657 )
Norm@50keV  : 1.77853E-02    ( -0.0088415   0.0224981 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.58 using 59 PHA bins.
# Reduced chi-squared =          1.082 for     56 degrees of freedom 
# Null hypothesis probability =   3.141741e-01
 
Photon flux (15-150 keV)    in 27.23 sec: 0.850973 ( -0.073707  0.073638 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.66279e-06 ( -1.85495e-07  1.87745e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   19.004 sec. to   20.004 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.1958     ( -0.296178   0.307796 )
Norm@50keV  : 1.75705E-02    ( -0.00312695   0.00312367 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.46 using 59 PHA bins.
# Reduced chi-squared =          1.166 for     57 degrees of freedom 
# Null hypothesis probability =   1.831840e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.06121 ( -0.37896  0.38014 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.78493e-07 ( -3.43877e-08  3.46642e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   19.004 sec. to   20.004 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.754016     ( -0.684619   1.40043 )
Epeak [keV] : 154.778      ( -154.784 -154.784 )
Norm@50keV  : 2.83406E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.00 using 59 PHA bins.
# Reduced chi-squared =          1.179 for     56 degrees of freedom 
# Null hypothesis probability =   1.694589e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.03049 ( -0.39054  0.38846 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.74816e-07 ( -3.59295e-08  3.59255e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 24.0 sec.
Hardness ratio (energy fluence ratio) = 1.37835139868

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

S(15-50 keV)  = 7.006516e-07
S(50-150 keV) = 1.087015e-06

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 = 1.887154681936289E-01, IMY = -6.892353721042619E-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:
-1.699410 13.656000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6096  21.9944    0.9  21.5  -40.0   0.5682  12.6    1.8	Crab                          
121.9490 -43.4837    2.1  53.8  158.6   1.3828   5.5 ------	UNKNOWN                       
106.2725  41.8442    2.3  36.7    9.8   0.3152   5.1 ------	UNKNOWN                       
 97.9609 -37.6260    2.1  43.5 -179.9   0.3768   5.4 ------	UNKNOWN

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

Time interval of the image:
13.656000 40.888000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7084  22.1563    7.5  21.5  -39.5   0.1487   1.5    9.5	Crab                          
133.4917  13.4875    0.9  35.5   74.7   3.0278  12.2 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:

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