GRB210217A: 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: Sat Jul 30 00:05:13 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1033264
======================================================================

  Trigger: 01033264      Segment: 000

  BAT Trigger Time: 635297168.832   [s; MET]
      Trigger Stop: 635297169.856   [s; MET]
               UTC: 2021-02-17T23:25:42.306620    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 97.6103563204343   Dec: 68.7148663144961  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    13.81
     Image Trigger?:     NO
     Rate S/N Ratio:     30.1662062579967  [ if not an image trigger ]
     Image S/N Ratio:    13.81

  Analysis Position:   [ source = BAT ]
    RA: 97.6103563204343   Dec: 68.7148663144961  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 97.5571228385546   Dec: 68.7132740600339  [deg; J2000]  
        { 06h 30m 13.7s , +68d 42' 47.8" }
         +/- 1.40065927080951 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.635981327716574 [arcmin] (formal 1-sigma fit error)
    SNR: 18.7962819599304
 
  Angular difference between the analysis and refined position is 1.163426 arcmin
 
  Partial Coding Fraction: 0.3085938    [ including projection effects ]

  Duration
     T90: 4 +/- 1.4142135623731
        Measured from: -0.832000017166138
                   to: 3.16799998283386     [s; relative to TRIGTIME]
     T50: 1 +/- 1
        Measured from: 0.167999982833862
                   to: 1.16799998283386     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.167999982833862     
                   to: 1.16799998283386     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.832000017166138     
                   to: 3.16799998283386     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.322712   0.439980   0.235825   0.049488
           0.030654   0.032386   0.027857   0.023582 [error]
 Peak      0.154019   0.225873   0.129668   0.032373
           0.017227   0.018831   0.015978   0.012513 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    4.000   -0.832    3.168
T90     4.000   -0.832    3.168
T50     1.000    0.168    1.168
Peak    1.000    0.168    1.168
 
 
====== 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      -1.913    -0.160      0.155       -           -               -         1.71e-02     -1.74e-03          1.71e-03      63.240   57
CPL     -1.330    -0.674      0.840       51.280     -16.316       -51.280      3.60e-02     -1.94e-02          6.94e-02      61.140   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      -1.853     -0.177     0.170       -           -               -         3.50e-02     -3.88e-03          3.82e-03      58.360   57
CPL     -1.420     -0.807     0.844       63.858     -22.204       -63.858      5.95e-02     -2.62e-02          1.07e-01      57.290   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   1.29e-07  1.85e-07  1.96e-07  3.86e-07  6.31e-07  8.96e-07   erg/cm2
      90%_error_low -1.70e-08 -1.63e-08 -2.66e-08 -9.61e-08 -6.23e-08 -1.25e-07   erg/cm2
      90%_error_hi   1.75e-08  1.64e-08  2.66e-08  1.14e-07  6.30e-08  1.39e-07   erg/cm2
Peak flux       PL   2.03e+00  1.66e+00  9.17e-01  7.46e-01  4.93e+00  5.35e+00   ph/cm2/s
      90%_error_low -3.10e-01 -1.68e-01 -1.30e-01 -1.89e-01 -5.04e-01 -5.32e-01   ph/cm2/s
      90%_error_hi   3.22e-01  1.68e-01  1.29e-01  2.21e-01  5.05e-01  5.32e-01   ph/cm2/s
 
Fluence        CPL   1.21e-07  1.98e-07  1.97e-07  1.58e-07  6.02e-07  6.74e-07   erg/cm2
      90%_error_low -1.99e-08 -2.06e-08 -3.01e-08 -1.00e-07 -7.16e-08 -1.25e-07   erg/cm2
      90%_error_hi   1.99e-08  2.36e-08  2.91e-08  2.60e-07  7.17e-08  2.79e-07   erg/cm2
Peak flux      CPL   1.90e+00  1.74e+00  9.47e-01  4.61e-01  4.86e+00  5.05e+00   ph/cm2/s
      90%_error_low -3.70e-01 -2.13e-01 -1.42e-01 -2.59e-01 -5.19e-01 -6.03e-01   ph/cm2/s
      90%_error_hi   3.78e-01  2.23e-01  1.46e-01  4.69e-01  5.18e-01  6.85e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   97.5571    68.7133   0.0102    45.6972   174.9711         1.1413343     18.796 TRIG_01033264                 
 
Foreground time interval of the image:
 -0.832   3.168 (delta_t =   4.000 [sec])
Background time interval of the image:
-239.832  -0.832 (delta_t = 239.000 [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   -0.832 sec. to    3.168 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.91282     ( -0.160385   0.154892 )
Norm@50keV  : 1.71398E-02    ( -0.00173832   0.00171168 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   63.24     using 59 bins.
 Reduced chi-squared = 1.10947
# Null hypothesis probability of 2.65e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 4 sec: 2.47340 ( -0.22361  0.22389 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.30508e-07 ( -6.23488e-08  6.29816e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.832 sec. to    3.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.32999     ( -0.674408   0.84025 )
Epeak [keV] : 51.2799      ( -16.3111 -51.2753 )
Norm@50keV  : 3.60089E-02    ( -0.0194093   0.0694117 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   61.14     using 59 bins.
 Reduced chi-squared = 1.09179
# Null hypothesis probability of 2.97e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 4 sec: 2.42077 ( -0.23358  0.2327 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.01588e-07 ( -7.16196e-08  7.1714e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.168 sec. to    1.168 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.85343     ( -0.177159   0.16996 )
Norm@50keV  : 3.50346E-02    ( -0.00388038   0.00382008 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.36     using 59 bins.
 Reduced chi-squared = 1.02386
# Null hypothesis probability of 4.25e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 4.93163 ( -0.50404  0.50478 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.22174e-07 ( -3.55253e-08  3.57493e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.168 sec. to    1.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.41964     ( -0.8068   0.843719 )
Epeak [keV] : 63.8578      ( -22.2027 -63.8564 )
Norm@50keV  : 5.95113E-02    ( -0.0261577   0.106872 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.29     using 59 bins.
 Reduced chi-squared = 1.02304
# Null hypothesis probability of 4.27e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 4.86070 ( -0.51885  0.51791 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.14355e-07 ( -3.84751e-08  3.81376e-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 = -1.020694682050474E+00, IMY = -8.981749307703840E-02

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:
-239.832000 -0.832000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4511  35.4599    7.6  32.8  -39.9  -0.5320  -1.5    7.1	Her X-1                       
337.2244  64.9205    2.8  47.9 -129.2   5.1747   4.2 ------	UNKNOWN                       
350.9000  65.0983    3.1  51.0 -135.6   4.7603   3.8 ------	UNKNOWN                       

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

Time interval of the image:
-0.832000 3.168000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.2947  35.3735    5.9  32.8  -39.7   0.0683   1.9    8.2	Her X-1                       
175.6420  32.4063    2.7  39.1   87.6   0.4736   4.3 ------	UNKNOWN                       
 97.5571  68.7133    0.6  45.7  175.0   1.1413  18.8 ------	UNKNOWN                       
345.0177  65.1491    2.1  49.6 -132.9   0.6802   5.5 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
81.868600 508.168600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6587  22.0145    1.5  47.5  167.6   8.0516   7.5    1.4	Crab                          
188.7156  43.7285    2.4  50.3   39.9   7.7691   4.8 ------	UNKNOWN                       
194.3322  78.1325    3.7  25.4   -1.7   1.2537   3.1 ------	UNKNOWN                       
245.0676  50.3562    3.2  58.5   -6.4  10.3493   3.7 ------	UNKNOWN                       
 56.2236  17.7366    3.0  57.1 -161.5   7.1506   3.8 ------	UNKNOWN                       
 42.8104  24.0486    3.9  55.2 -144.8   9.3603   3.0 ------	UNKNOWN