GRB210712A: 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 v2.48
    Process Start Time: Fri Jul 29 22:52:10 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1059881
======================================================================

  Trigger: 01059881      Segment: 000

  BAT Trigger Time: 647775819.264   [s; MET]
      Trigger Stop: 647775820.288   [s; MET]
               UTC: 2021-07-12T09:43:11.908060    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 97.3371382959892   Dec: -35.3927995898211  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    13.19
     Image Trigger?:     NO
     Rate S/N Ratio:     25.4950975679639  [ if not an image trigger ]
     Image S/N Ratio:    13.19

  Analysis Position:   [ source = BAT ]
    RA: 97.3371382959892   Dec: -35.3927995898211  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 97.3206219458295   Dec: -35.3785892701672  [deg; J2000]  
        { 06h 29m 16.9s , -35d 22' 42.9" }
         +/- 1.66255132301049 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.634139844322298 [arcmin] (formal 1-sigma fit error)
    SNR: 14.7138199000554
 
  Angular difference between the analysis and refined position is 1.174603 arcmin
 
  Partial Coding Fraction: 0.7109375    [ including projection effects ]

  Duration
     T90: 121.283999919891 +/- 18.7180052899151
        Measured from: -34.8400000333786
                   to: 86.4439998865128     [s; relative to TRIGTIME]
     T50: 51.2000000476837 +/- 2.79096254503082
        Measured from: 1.85999989509583
                   to: 53.0599999427795     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0879999399185181     
                   to: 1.08799993991852     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -40.0760000944138     
                   to: 108.739999890327     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.768442   2.210232   1.123472   0.306663
           0.097803   0.099462   0.084113   0.076598 [error]
 Peak      0.060341   0.107385   0.083920   0.025523
           0.009915   0.010975   0.009912   0.007824 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  148.816  -40.076  108.740
T90   121.284  -34.840   86.444
T50    51.200    1.860   53.060
Peak    1.000    0.088    1.088
 
 
====== 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: N/A)
 
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      -1.828    -0.103      0.102       -           -               -         2.21e-03     -1.39e-04          1.38e-04      63.440   57
CPL     -1.099    -0.453      0.514       54.603      -8.303        20.782      5.56e-03     -2.39e-03          5.06e-03      55.380   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
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      -1.291     -0.185     0.188       -           -               -         1.90e-02     -2.15e-03          2.15e-03      63.060   57
CPL     -0.673     -0.688     0.866      109.557     -37.838      -109.557      3.87e-02     -2.06e-02          6.42e-02      60.900   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   5.71e-07  8.59e-07  9.67e-07  2.07e-06  3.02e-06  4.47e-06   erg/cm2
      90%_error_low -4.99e-08 -4.84e-08 -8.23e-08 -3.41e-07 -1.92e-07 -4.23e-07   erg/cm2
      90%_error_hi   5.10e-08  4.84e-08  8.28e-08  3.84e-07  1.93e-07  4.56e-07   erg/cm2
Peak flux       PL   6.40e-01  7.29e-01  5.96e-01  8.15e-01  2.26e+00  2.78e+00   ph/cm2/s
      90%_error_low -1.27e-01 -9.36e-02 -7.95e-02 -2.02e-01 -2.62e-01 -3.25e-01   ph/cm2/s
      90%_error_hi   1.34e-01  9.24e-02  7.88e-02  2.40e-01  2.63e-01  3.29e-01   ph/cm2/s
 
Fluence        CPL   5.23e-07  9.28e-07  9.55e-07  6.81e-07  2.80e-06  3.09e-06   erg/cm2
      90%_error_low -5.82e-08 -6.41e-08 -9.49e-08 -3.13e-07 -2.25e-07 -3.89e-07   erg/cm2
      90%_error_hi   5.87e-08  6.57e-08  9.24e-08  6.14e-07  2.30e-07  6.44e-07   erg/cm2
Peak flux      CPL   5.73e-01  7.75e-01  6.31e-01  4.22e-01  2.22e+00  2.40e+00   ph/cm2/s
      90%_error_low -1.47e-01 -1.09e-01 -9.09e-02 -2.25e-01 -2.68e-01 -3.58e-01   ph/cm2/s
      90%_error_hi   1.54e-01  1.14e-01  9.35e-02  4.70e-01  2.68e-01  5.26e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   97.3206   -35.3786   0.0130    31.7968  -150.8061         2.0088879     14.714 TRIG_01059881                 
 
Foreground time interval of the image:
-40.076  17.037 (delta_t =  57.113 [sec])
Background time interval of the image:
-239.264 -40.076 (delta_t = 199.188 [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  -40.076 sec. to  108.740 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.82825     ( -0.103493   0.101906 )
Norm@50keV  : 2.20505E-03    ( -0.000138944   0.000137814 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   63.44     using 59 bins.
 Reduced chi-squared = 1.11298
# Null hypothesis probability of 2.60e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 148.8 sec: 0.307260 ( -0.017606  0.017627 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.01859e-06 ( -1.91735e-07  1.93468e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -40.076 sec. to  108.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.09888     ( -0.453431   0.513994 )
Epeak [keV] : 54.6026      ( -8.30257 20.782 )
Norm@50keV  : 5.55578E-03    ( -0.00239209   0.00506099 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.38     using 59 bins.
 Reduced chi-squared = 0.988929
# Null hypothesis probability of 4.98e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 148.8 sec: 0.296274 ( -0.018802  0.018802 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.80281e-06 ( -2.24871e-07  2.29912e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.088 sec. to    1.088 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.2913     ( -0.18543   0.187622 )
Norm@50keV  : 1.89953E-02    ( -0.00215414   0.00215205 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   63.06     using 59 bins.
 Reduced chi-squared = 1.10632
# Null hypothesis probability of 2.71e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.26262 ( -0.26213  0.26256 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.88131e-07 ( -2.34286e-08  2.36076e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.088 sec. to    1.088 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.673076     ( -0.687572   0.866308 )
Epeak [keV] : 109.557      ( -37.8387 -109.558 )
Norm@50keV  : 3.87457E-02    ( -0.0206344   0.064246 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.90     using 59 bins.
 Reduced chi-squared = 1.0875
# Null hypothesis probability of 3.04e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.21741 ( -0.26835  0.26819 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.80393e-07 ( -2.58355e-08  2.55561e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

S(15-50 keV)  = N/A
S(50-150 keV) = N/A

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 = -5.411982822283098E-01, IMY = 3.023903508242055E-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:
-239.264000 -40.076000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5372 -40.5609    0.5   7.9  -77.9   6.0702  24.9    0.5	Vela X-1                      
169.9114 -60.6254    0.0  22.4   65.3   0.2196   0.7   11.9	Cen X-3                       
186.6325 -62.7601    1.5  30.5   66.5   3.2598   7.7    0.9	GX 301-2                      
 54.3139 -41.3423    2.4  56.1  173.7   6.0084   4.7 ------	UNKNOWN                       
189.3066  -9.9845    2.9  58.1   -3.3   6.6919   4.0 ------	UNKNOWN                       
124.9573 -12.3130    2.6  37.4  -89.6   3.5771   4.5 ------	UNKNOWN                       

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

Time interval of the image:
-40.076000 17.036600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6647 -40.6364    4.9   7.8  -77.3   0.2765   2.3    7.9	Vela X-1                      
170.2122 -60.4557    3.0  22.4   64.8   0.5557   3.9   10.5	Cen X-3                       
186.6689 -62.8815    5.4  30.5   66.7   0.4564   2.1    6.7	GX 301-2                      
 97.3206 -35.3786    0.8  31.8 -150.8   2.0089  14.7 ------	UNKNOWN                       
181.8537  -5.6799    2.6  57.2  -13.4   2.1447   4.5 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
69.836600 612.036600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5435 -40.5710    0.4  30.3    5.8  15.2131  25.8    1.2	Vela X-1                      
 52.9705 -67.7966    2.6  40.8   98.2   8.2865   4.5 ------	UNKNOWN                       
169.0387 -39.4388    2.5  55.5   11.6  13.9579   4.7 ------	UNKNOWN                       
157.6391 -12.3991    3.3  58.7  -22.7   9.6970   3.5 ------	UNKNOWN