GRB120302A

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 GROUND-DETECTED GRB DATA PROCESSING REPORT                 
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Nov 25 12:09:33 EST 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger516694
======================================================================

  Trigger: 00516694      Segment: 000

  BAT Trigger Time: 352346140.8
               UTC: 2012-03-02T01:55:32.852   [includes UTCF correction]
       Where From?: Ground analysis (best_duration.txt)
  NOTE: BAT trigger time for ground-detected burst is the T100 start time.
 
  Analysis Position:   [ source = GCN ]
    RA: 122.426   Dec: 29.642  [deg; J2000]
 
  Refined Position:   [ source = BAT pre-slew image ]
    RA: 122.426   Dec: 29.642  [deg; J2000]
        { 08h 09m 42.2s , +29d 38' 31.2" }
        +/- 2.69397087871 [arcmin] (estimated 90% radius based on SNR)
    SNR: 7.38462085206
 
 
  Angular difference between the analysis and refined position is 0.000000 arcmin
 
  Partial Coding Fraction: 0.2539062    [ including projection effects ]

  Duration
     T90: 49.6000000238419 +/- 1.6
        Measured from: 1.6
                   to: 51.2     [s; relative to TRIGTIME]
     T50: 27.1999999880791 +/- 1.6
        Measured from: 12.8
                   to: 40     [s; relative to TRIGTIME]
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   52.800    0.000   52.800
T90    49.600    1.600   51.200
T50    27.200   12.800   40.000
Peak    1.000    0.300    1.300
 
 
====== 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      -0.826    -0.347      0.386       -           -               -         3.88e-03     -8.43e-04          8.14e-04      41.610   57
CPL     -0.513    -0.960      1.769      296.698    -296.698      -296.698      5.20e-03     -2.06e-03          1.74e-02      41.440   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      -0.827     -0.502     0.589       -           -               -         7.12e-03     -2.50e-03          2.38e-03      50.160   57
CPL      0.099     -0.099     3.380      141.472    -141.472      -141.472      1.70e-02     -1.70e-02          2.69e-01      49.570   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   2.18e-08  6.09e-08  1.37e-07  8.27e-07  3.70e-07  1.05e-06   erg/cm2
      90%_error_low -9.17e-09 -1.70e-08 -2.73e-08 -3.29e-07 -7.37e-08 -3.43e-07   erg/cm2
      90%_error_hi   1.10e-08  1.66e-08  2.70e-08  4.81e-07  7.40e-08  4.78e-07   erg/cm2
Peak flux       PL   1.54e-01  2.33e-01  2.62e-01  5.62e-01  8.18e-01  1.21e+00   ph/cm2/s
      90%_error_low -9.23e-02 -1.03e-01 -8.12e-02 -2.89e-01 -2.70e-01 -3.86e-01   ph/cm2/s
      90%_error_hi   1.22e-01  1.02e-01  8.09e-02  4.46e-01  2.75e-01  4.19e-01   ph/cm2/s
 
Fluence        CPL   1.98e-08  6.14e-08  1.42e-07  5.73e-07  3.67e-07  7.97e-07   erg/cm2
      90%_error_low -1.17e-08 -1.79e-08 -3.13e-08 -4.25e-07 -7.70e-08 -4.29e-07   erg/cm2
      90%_error_hi   1.26e-08  1.77e-08  3.54e-08  3.54e-07  7.48e-08  3.70e-07   erg/cm2
Peak flux      CPL   1.15e-01  2.37e-01  2.96e-01  2.83e-01  7.97e-01  9.32e-01   ph/cm2/s
      90%_error_low -1.15e-01 -1.22e-01 -1.04e-01 -2.83e-01 -2.70e-01 -3.70e-01   ph/cm2/s
      90%_error_hi   1.46e-01  1.17e-01  1.14e-01  4.15e-01  2.78e-01  5.04e-01   ph/cm2/s
 
======================================================================

Special notes of this burst

Image

15.0-350.0 keV image (Event data)

#RAcent DECcent POSerr Theta  Phi  Peak_Cts  SNR Name
122.426 29.642 0.000 34.405 113.092 0.432 7.385 TRIG_00516694
 
Image time interval: 0.000 to 8.247 [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.

Best duration plot

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    0.000 sec. to    8.247 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.825949     ( -0.346882   0.386026 )
Norm@50keV  : 3.88452E-03    ( -0.000843331   0.00081379 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.61 using 59 PHA bins.
# Reduced chi-squared =         0.7299 for     57 degrees of freedom 
# Null hypothesis probability =   9.373480e-01
 
Photon flux (15-150 keV)    in 8.247 sec: 0.446107 ( -0.092413  0.093615 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.70379e-07 ( -7.36933e-08  7.39927e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.000 sec. to    8.247 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.512978     ( -0.959828   1.76875 )
Epeak [keV] : 296.698      ( -296.698 -296.698 )
Norm@50keV  : 5.20023E-03    ( -0.00206017   0.0174176 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.44 using 59 PHA bins.
# Reduced chi-squared =         0.7401 for     56 degrees of freedom 
# Null hypothesis probability =   9.267844e-01
 
Photon flux (15-150 keV)    in 8.247 sec: 0.439870 ( -0.096087  0.096692 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.6662e-07 ( -7.70479e-08  7.48045e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.300 sec. to    1.300 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.826592     ( -0.501892   0.588777 )
Norm@50keV  : 7.12335E-03    ( -0.00249875   0.00237997 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.16 using 59 PHA bins.
# Reduced chi-squared =         0.8800 for     57 degrees of freedom 
# Null hypothesis probability =   7.274289e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.818061 ( -0.269935  0.275249 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.23341e-08 ( -2.57779e-08  2.58716e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.300 sec. to    1.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.0994598     ( -0.0997467   3.37979 )
Epeak [keV] : 141.472      ( -141.458 -141.458 )
Norm@50keV  : 1.70048E-02    ( -0.0170076   0.269136 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.57 using 59 PHA bins.
# Reduced chi-squared =         0.8853 for     56 degrees of freedom 
# Null hypothesis probability =   7.150995e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.796945 ( -0.269533  0.278485 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.09916e-08 ( -2.71311e-08  2.64915e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 49.6 sec.
Hardness ratio (energy fluence ratio) = 2.25647245415

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

S(15-50 keV)  = 8.270407e-08
S(50-150 keV) = 2.876751e-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 = -0.268601228669, IMY = -0.629978210248

Spacecraft aspect plot

Bright source in the event data image

Event data image of 15-350 keV band

Time interval of the image:
6.148000 8.246700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6660  22.0315    1.7  24.5 -172.5   0.1032   6.8    2.1	Crab                          
139.2365  49.6484    2.6  36.4   71.7   0.1611   4.5 ------	UNKNOWN                       
 78.7448   4.6342    2.7  42.1 -165.2   0.1012   4.3 ------	UNKNOWN                       
333.9121  69.6374    2.2  53.2  -16.6   0.1965   5.2 ------	UNKNOWN                       
 61.7468   9.7966    2.3  41.2 -138.5   0.1215   5.1 ------	UNKNOWN

Webpage updated on:
Wed Nov 25 12:29:13 EST 2015

Analysis Summary

Notes:

Image

15.0-350.0 keV image (Event data)

Light Curves

Best duration plot

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 event data image

Event data 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