GRB220706A: 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: Mon Oct 24 11:42:09 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1114937
======================================================================

  Trigger: 01114937      Segment: 000

  BAT Trigger Time: 678816583.744   [s; MET]
      Trigger Stop: 678816585.792   [s; MET]
               UTC: 2022-07-06T16:09:14.296300    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 0.586794992558329   Dec: -16.3913692713963  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.84
     Image Trigger?:     NO
     Rate S/N Ratio:     11.6189500386223  [ if not an image trigger ]
     Image S/N Ratio:    8.84

  Analysis Position:   [ source = BAT ]
    RA: 0.586794992558329   Dec: -16.3913692713963  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 0.576635887418828   Dec: -16.4099403096171  [deg; J2000]  
        { 00h 02m 18.4s , -16d 24' 35.8" }
         +/- 1.83874457719802 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.69680251666877 [arcmin] (formal 1-sigma fit error)
    SNR: 12.7417963243122
 
  Angular difference between the analysis and refined position is 1.258374 arcmin
 
  Partial Coding Fraction: 0.7421875    [ including projection effects ]

  Duration
     T90: 85.9960000514984 +/- 18.3338030110254
        Measured from: -55.3880000114441
                   to: 30.6080000400543     [s; relative to TRIGTIME]
     T50: 24.4279999732971 +/- 10.183611313527
        Measured from: -12.055999994278
                   to: 12.3719999790192     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 3.72400009632111     
                   to: 4.72400009632111     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -71.039999961853     
                   to: 36.0360000133514     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.786151   0.922146   0.528778   0.226466
           0.067553   0.069822   0.062252   0.058334 [error]
 Peak      0.029890   0.050888   0.025863   0.013277
           0.006969   0.007331   0.006415   0.005816 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  107.076  -71.040   36.036
T90    85.996  -55.388   30.608
T50    24.428  -12.056   12.372
Peak    1.000    3.724    4.724
 
 
====== 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      -1.757    -0.176      0.171       -           -               -         1.36e-03     -1.40e-04          1.37e-04      41.570   57
CPL     -1.757    -0.176      0.307     9999.350    -9999.340      -9999.350      1.36e-03     -9.16e-04          1.21e-03      41.570   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      -1.632     -0.351     0.340       -           -               -         6.98e-03     -1.49e-03          1.44e-03      68.890   57
CPL     -1.644     -0.341     0.599     9999.360    -9999.350      -9999.360      6.93e-03     -1.45e-03          2.91e-02      68.890   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   2.36e-07  3.72e-07  4.40e-07  1.01e-06  1.34e-06  2.06e-06   erg/cm2
      90%_error_low -3.28e-08 -3.26e-08 -6.28e-08 -2.71e-07 -1.42e-07 -3.34e-07   erg/cm2
      90%_error_hi   3.39e-08  3.27e-08  6.32e-08  3.34e-07  1.45e-07  3.85e-07   erg/cm2
Peak flux       PL   3.26e-01  3.03e-01  1.96e-01  1.95e-01  9.06e-01  1.02e+00   ph/cm2/s
      90%_error_low -9.40e-02 -5.76e-02 -5.39e-02 -8.89e-02 -1.69e-01 -1.97e-01   ph/cm2/s
      90%_error_hi   9.88e-02  5.73e-02  5.40e-02  1.28e-01  1.70e-01  2.00e-01   ph/cm2/s
 
Fluence        CPL   2.38e-07  3.69e-07  4.40e-07  1.05e-06  1.36e-06  2.04e-06   erg/cm2
      90%_error_low -3.79e-08 -3.15e-08    N/A    -6.57e-07 -1.70e-07 -6.19e-07   erg/cm2
      90%_error_hi   3.49e-08  4.32e-08    N/A     1.37e-07  1.24e-07  2.37e-07   erg/cm2
Peak flux      CPL   3.29e-01  2.99e-01  1.94e-01  1.97e-01  9.07e-01  1.02e+00   ph/cm2/s
      90%_error_low -1.05e-01 -5.48e-02 -5.25e-02     N/A   -1.71e-01 -2.42e-01   ph/cm2/s
      90%_error_hi   1.03e-01  7.42e-02  5.59e-02     N/A    1.69e-01  1.82e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
    0.5766   -16.4099   0.0151    21.1586   123.7046         2.2697742     12.742 TRIG_01114937                 
 
Foreground time interval of the image:
-66.443  29.757 (delta_t =  96.200 [sec])
Background time interval of the image:

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  -71.040 sec. to   36.036 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.75727     ( -0.175708   0.170512 )
Norm@50keV  : 1.35756E-03    ( -0.000140061   0.000137261 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   41.57     using 59 bins.
 Reduced chi-squared = 0.729298
# Null hypothesis probability of 9.38e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 107.1 sec: 0.184069 ( -0.01629  0.016303 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.34128e-06 ( -1.42083e-07  1.44827e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -71.040 sec. to   36.036 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.75687     ( -0.176068   0.306485 )
Epeak [keV] : 9999.35      ( -9999.35 -9999.36 )
Norm@50keV  : 1.35920E-03    ( -0.000916072   0.00120603 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   41.57     using 59 bins.
 Reduced chi-squared = 0.742321
# Null hypothesis probability of 9.25e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 107.1 sec: 0.184749 ( -0.018036  0.017164 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.35931e-06 ( -1.69882e-07  1.23989e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    3.724 sec. to    4.724 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.63229     ( -0.351311   0.340244 )
Norm@50keV  : 6.97527E-03    ( -0.00149228   0.00144308 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   68.89     using 59 bins.
 Reduced chi-squared = 1.2086
# Null hypothesis probability of 1.34e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.905586 ( -0.16948  0.169524 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.5001e-08 ( -1.45871e-08  1.5069e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    3.724 sec. to    4.724 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.64362     ( -0.34451   0.595479 )
Epeak [keV] : 9999.36      ( -9999.35 -9999.36 )
Norm@50keV  : 6.93325E-03    ( -0.00148624   0.0290993 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   68.89     using 59 bins.
 Reduced chi-squared = 1.23018
# Null hypothesis probability of 1.16e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.906672 ( -0.170951  0.169008 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.55813e-08 ( -1.11097e-08  9.2839e-09 ) 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 = -2.147751411164212E-01, IMY = -3.219851867981682E-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:
 

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

Time interval of the image:
-66.443400 29.756600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
  0.5767 -16.4099    0.9  21.2  123.7   2.2699  12.7 ------	UNKNOWN                       
357.7671  27.3931    2.5  54.5  176.0   2.8226   4.7 ------	UNKNOWN                       
 37.1112 -40.5479    3.1  22.6   -7.5   0.5926   3.7 ------	UNKNOWN                       
 83.5318 -64.2880    2.1  58.2   -3.7   4.0965   5.4 ------	UNKNOWN                       
 17.0660  37.5543    3.3  59.5 -161.9   4.3609   3.4 ------	UNKNOWN                       
 45.9774  11.5197    2.2  40.6 -119.8   1.9741   5.2 ------	UNKNOWN                       
 38.2799  27.7386    2.7  51.8 -139.0   3.2406   4.3 ------	UNKNOWN                       
 70.2957 -19.7388    4.1  44.8  -60.5   2.1593   2.8 ------	UNKNOWN                       
 54.7887   5.0056    3.0  41.6 -103.3   2.7844   3.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
85.756600 962.357100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
354.0971  21.7203    3.2  38.6 -170.8   5.5903   3.6 ------	UNKNOWN                       
 25.2807 -45.0858    4.7  35.4  -11.7   3.4438   2.4 ------	UNKNOWN                       
 11.3175  17.8471    2.5  35.8 -143.5   6.7445   4.6 ------	UNKNOWN                       
 47.2531 -18.5531    2.2  44.4  -61.1  27.2329   5.2 ------	UNKNOWN