GRB210919A: 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 00:28:35 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1073893
======================================================================

  Trigger: 01073893      Segment: 000

  BAT Trigger Time: 653704141.312   [s; MET]
      Trigger Stop: 653704141.568   [s; MET]
               UTC: 2021-09-19T00:28:33.559600    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 80.229910067484   Dec: 1.27427647843543  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.91
     Image Trigger?:     NO
     Rate S/N Ratio:     24.2899156029822  [ if not an image trigger ]
     Image S/N Ratio:    8.91

  Analysis Position:   [ source = BAT ]
    RA: 80.229910067484   Dec: 1.27427647843543  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 80.2422685419908   Dec: 1.28556259895594  [deg; J2000]  
        { 05h 20m 58.1s , +01d 17' 08.0" }
         +/- 2.01636502751695 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.12106556242724 [arcmin] (formal 1-sigma fit error)
    SNR: 11.169136158686
 
  Angular difference between the analysis and refined position is 1.004050 arcmin
 
  Partial Coding Fraction: 0.5    [ including projection effects ]

  Duration
     T90: 0.163999915122986 +/- 0.0312410238573899
        Measured from: 0.0640000104904175
                   to: 0.227999925613403     [s; relative to TRIGTIME]
     T50: 0.0759999752044678 +/- 0.0256125023115591
        Measured from: 0.107999920845032
                   to: 0.1839998960495     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.354000091552734     
                   to: 0.645999908447266     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.0519999265670776     
                   to: 0.235999941825867     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.041528   0.050042   0.046457   0.020371
           0.006644   0.007824   0.008006   0.006798 [error]
 Peak      0.041603   0.059485   0.055106   0.024258
           0.012420   0.013559   0.013228   0.012569 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.184    0.052    0.236
T90     0.164    0.064    0.228
T50     0.076    0.108    0.184
Peak    1.000   -0.354    0.646
 
 
====== 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      -1.577    -0.285      0.261       -           -               -         5.07e-02     -8.95e-03          8.76e-03      40.400   57
CPL     -1.145    -0.676      1.102      107.595     -49.586      -107.595      8.22e-02     -8.22e-02          1.94e-01      39.750   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      -1.310     -0.423     0.421       -           -               -         1.23e-02     -2.84e-03          2.83e-03      49.630   57
CPL     -1.156     -2.908     1.504      289.214      N/A           N/A         1.46e-02        N/A               N/A         49.680   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   1.28e-08  2.25e-08  3.01e-08  8.29e-08  8.76e-08  1.48e-07   erg/cm2
      90%_error_low -3.08e-09 -3.69e-09 -6.96e-09 -3.36e-08 -1.65e-08 -4.10e-08   erg/cm2
      90%_error_hi   3.27e-09  3.67e-09  6.81e-09  4.33e-08  1.67e-08  4.87e-08   erg/cm2
Peak flux       PL   4.23e-01  4.76e-01  3.84e-01  5.15e-01  1.47e+00  1.80e+00   ph/cm2/s
      90%_error_low -1.70e-01 -1.26e-01 -1.09e-01 -2.54e-01 -3.45e-01 -4.26e-01   ph/cm2/s
      90%_error_hi   1.94e-01  1.22e-01  1.06e-01  3.70e-01  3.46e-01  4.38e-01   ph/cm2/s
 
Fluence        CPL   1.09e-08  1.53e-08  1.65e-08  4.05e-08  5.36e-08  8.35e-08   erg/cm2
      90%_error_low -4.60e-09 -6.23e-09 -5.58e-09 -1.64e-08 -1.95e-08 -2.38e-08   erg/cm2
      90%_error_hi   3.30e-09  2.34e-08  4.34e-09  1.32e-08  1.50e-08  1.61e-08   erg/cm2
Peak flux      CPL   4.27e-01  4.74e-01  3.82e-01  5.42e-01  1.48e+00  1.83e+00   ph/cm2/s
      90%_error_low -4.27e-01 -1.26e-01 -1.09e-01     N/A   -3.67e-01 -6.71e-01   ph/cm2/s
      90%_error_hi   1.92e-01  1.46e-01  1.33e-01     N/A    3.47e-01  3.82e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   80.2423     1.2856   0.0172    42.6196   -12.3466         0.1601929     11.169 TRIG_01073893                 
 
Foreground time interval of the image:
  0.052   0.236 (delta_t =   0.184 [sec])
Background time interval of the image:
-239.312   0.052 (delta_t = 239.364 [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    0.052 sec. to    0.236 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.57652     ( -0.284584   0.261337 )
Norm@50keV  : 5.07332E-02    ( -0.00895201   0.0087584 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   40.40     using 59 bins.
 Reduced chi-squared = 0.708772
# Null hypothesis probability of 9.53e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 0.184 sec: 6.47313 ( -1.05376  1.0541 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.75726e-08 ( -1.654e-08  1.66754e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.052 sec. to    0.236 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.14456     ( -0.676514   1.10238 )
Epeak [keV] : 107.595      ( -49.5811 -107.59 )
Norm@50keV  : 8.22471E-02    ( -0.0822497   0.194258 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   39.75     using 59 bins.
 Reduced chi-squared = 0.709821
# Null hypothesis probability of 9.51e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 0.184 sec: 6.41966 ( -1.06217  1.06068 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.36189e-08 ( -1.95375e-08  1.49612e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.354 sec. to    0.646 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.31044     ( -0.422539   0.421185 )
Norm@50keV  : 1.23179E-02    ( -0.00283687   0.0028283 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.63     using 59 bins.
 Reduced chi-squared = 0.870702
# Null hypothesis probability of 7.45e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.47244 ( -0.34498  0.34645 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.21431e-07 ( -3.11638e-08  3.1639e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.354 sec. to    0.646 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.7129     ( -1.35011   3.06167 )
Epeak [keV] : 220.521      (   )
Norm@50keV  : 1.83020E-03    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.85     using 59 bins.
 Reduced chi-squared = 0.872321
# Null hypothesis probability of 7.40e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.47622 ( -0.36664  0.3471 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.21776e-07 ( -3.42595e-08  2.7727e-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 = 8.988959412444540E-01, IMY = 1.967562249808670E-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:
-239.312000 0.052000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6328  22.0115    0.5  30.9  -42.0  10.4923  21.7    0.2	Crab                          
 40.2931   0.8442    2.9  34.8   52.8   2.4503   4.0 ------	UNKNOWN                       

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

Time interval of the image:
0.052000 0.236000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7709  22.0775    8.4  31.0  -42.2   0.0163   1.4    8.5	Crab                          
348.3355  38.8512    2.1  49.7  148.2   0.1705   5.5 ------	UNKNOWN                       
 80.2424   1.2856    1.0  42.6  -12.3   0.1601  11.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
80.788600 962.748100
1285.688000 1375.790400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6357  22.0150    0.3  21.0 -169.3  40.0605  33.9    0.1	Crab                          
 43.4723  -8.4313    3.7  37.9   76.3  12.8674   3.2 ------	UNKNOWN                       
 66.3651 -20.3486    2.6  25.5   33.2   5.2119   4.4 ------	UNKNOWN                       
 81.8026 -24.3867    3.5  25.7   -1.5   3.3998   3.3 ------	UNKNOWN                       
106.5941 -48.0863    3.2  54.4  -19.6  11.9327   3.6 ------	UNKNOWN                       
105.9571  20.5816    3.0  31.7 -127.5   6.5197   3.8 ------	UNKNOWN                       
121.1070   7.9544    3.4  41.3  -98.8  16.8106   3.5 ------	UNKNOWN