GRB210222B: 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 00:00:09 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1034325
======================================================================

  Trigger: 01034325      Segment: 000

  BAT Trigger Time: 635726272.832   [s; MET]
      Trigger Stop: 635726274.88   [s; MET]
               UTC: 2021-02-22T22:37:26.278200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 154.621353612647   Dec: -14.898108406699  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.45
     Image Trigger?:     NO
     Rate S/N Ratio:     10.3440804327886  [ if not an image trigger ]
     Image S/N Ratio:    7.45

  Analysis Position:   [ source = BAT ]
    RA: 154.621353612647   Dec: -14.898108406699  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 154.627414996572   Dec: -14.9384390813758  [deg; J2000]  
        { 10h 18m 30.6s , -14d 56' 18.4" }
         +/- 2.04138789530057 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.750393496882707 [arcmin] (formal 1-sigma fit error)
    SNR: 10.9740672022125
 
  Angular difference between the analysis and refined position is 2.445225 arcmin
 
  Partial Coding Fraction: 0.3867188    [ including projection effects ]

  Duration
     T90: 12.1120001077652 +/- 0.907638672141884
        Measured from: -9.73600006103516
                   to: 2.37600004673004     [s; relative to TRIGTIME]
     T50: 7.27999997138977 +/- 3.82574016142967
        Measured from: -5.8639999628067
                   to: 1.41600000858307     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.875999927520752     
                   to: 1.87599992752075     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -10.2000000476837     
                   to: 2.69599997997284     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.331782   0.229772   0.117324   0.028369
           0.038658   0.039571   0.033468   0.029236 [error]
 Peak      0.062945   0.059178   0.048730   0.022577
           0.011389   0.012003   0.010294   0.008229 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   12.896  -10.200    2.696
T90    12.112   -9.736    2.376
T50     7.280   -5.864    1.416
Peak    1.000    0.876    1.876
 
 
====== 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      -2.339    -0.369      0.325       -           -               -         2.56e-03     -6.80e-04          6.68e-04      62.400   57
CPL     -1.928     N/A        N/A           6.175      N/A           N/A         4.70e-03        N/A               N/A         62.390   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      -1.818     -0.344     0.309       -           -               -         1.04e-02     -2.27e-03          2.18e-03      49.620   57
CPL     -1.797     -1.183     0.960      445.015    -444.744      -445.015      1.07e-02     -1.07e-02          2.12e-02      49.630   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   9.32e-08  1.03e-07  8.16e-08  1.07e-07  3.17e-07  3.84e-07   erg/cm2
      90%_error_low -1.85e-08 -1.93e-08 -2.78e-08 -5.60e-08 -6.62e-08 -1.01e-07   erg/cm2
      90%_error_hi   1.87e-08  1.87e-08  3.07e-08  8.86e-08  6.98e-08  1.26e-07   erg/cm2
Peak flux       PL   5.81e-01  4.85e-01  2.75e-01  2.31e-01  1.44e+00  1.57e+00   ph/cm2/s
      90%_error_low -1.61e-01 -9.35e-02 -7.61e-02 -1.04e-01 -2.79e-01 -3.01e-01   ph/cm2/s
      90%_error_hi   1.71e-01  9.32e-02  7.34e-02  1.35e-01  2.79e-01  3.01e-01   ph/cm2/s
 
Fluence        CPL   9.25e-08  1.07e-07  7.60e-08  4.47e-08  3.03e-07  3.20e-07   erg/cm2
      90%_error_low -1.80e-08 -1.88e-08 -3.43e-08 -3.61e-08 -8.05e-08 -9.78e-08   erg/cm2
      90%_error_hi   1.87e-08  1.83e-08  3.53e-08  1.27e-07  7.84e-08  1.71e-07   erg/cm2
Peak flux      CPL   5.87e-01  4.80e-01  2.72e-01  2.46e-01  1.44e+00  1.59e+00   ph/cm2/s
      90%_error_low -1.88e-01 -8.89e-02 -1.47e-01     N/A   -2.87e-01 -1.82e-01   ph/cm2/s
      90%_error_hi   1.79e-01  1.16e-01  9.22e-02     N/A    2.87e-01  2.88e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  154.6274   -14.9384   0.0175    28.4270    82.7663         0.7991920     10.974 TRIG_01034325                 
 
Foreground time interval of the image:
-10.200   2.696 (delta_t =  12.896 [sec])
Background time interval of the image:
-239.832 -10.200 (delta_t = 229.632 [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  -10.200 sec. to    2.696 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.33938     ( -0.369068   0.325382 )
Norm@50keV  : 2.55523E-03    ( -0.000679985   0.000668126 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   62.40     using 59 bins.
 Reduced chi-squared = 1.09474
# Null hypothesis probability of 2.90e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 12.9 sec: 0.456596 ( -0.074262  0.074287 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.1746e-07 ( -6.61905e-08  6.97529e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -10.200 sec. to    2.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.92834     (       )
Epeak [keV] : 6.17492      (   )
Norm@50keV  : 4.69641E-03    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   62.39     using 59 bins.
 Reduced chi-squared = 1.11411
# Null hypothesis probability of 2.60e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 12.9 sec: 0.451353 ( -0.073159  0.074184 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.02684e-07 ( -8.05377e-08  7.84339e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.876 sec. to    1.876 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.81818     ( -0.34353   0.308686 )
Norm@50keV  : 1.03943E-02    ( -0.0022689   0.00217555 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.62     using 59 bins.
 Reduced chi-squared = 0.870526
# Null hypothesis probability of 7.45e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.44261 ( -0.27868  0.27878 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.56533e-08 ( -2.06518e-08  2.06923e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.876 sec. to    1.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.79698     ( -1.17392   0.968717 )
Epeak [keV] : 445.015      ( -9965.78 -9966.05 )
Norm@50keV  : 1.06565E-02    ( -0.0104123   0.0214687 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.63     using 59 bins.
 Reduced chi-squared = 0.88625
# Null hypothesis probability of 7.13e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.44336 ( -0.28694  0.28717 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.56974e-08 ( -2.1416e-08  2.13953e-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 = 6.815979628195033E-02, IMY = -5.369977684412671E-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:
-239.832000 -10.200000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6139 -40.7037    8.8  21.0    6.2   0.2997   1.3    9.7	Vela X-1                      
169.9511 -60.5195    0.0  18.6  -88.1   0.0540   0.2   12.4	Cen X-3                       
186.8599 -62.7650    2.6  24.6 -104.1   1.3805   4.4    5.6	GX 301-2                      
144.2355  -5.5229    2.7  40.6   70.8   4.0550   4.3 ------	UNKNOWN                       
170.0335 -19.1908    3.5  23.7  116.5   1.0837   3.3 ------	UNKNOWN                       
100.5944 -22.5348    3.3  55.5   11.3   4.5297   3.5 ------	UNKNOWN                       
222.5396 -13.3869    3.0  58.1 -179.9   5.8104   3.9 ------	UNKNOWN                       
 93.1642 -42.8926    3.4  50.3  -14.7   2.0290   3.4 ------	UNKNOWN                       
230.2481 -23.1454    2.9  57.6 -165.5   4.6417   4.1 ------	UNKNOWN                       

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

Time interval of the image:
-10.200000 2.696000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.7367 -40.5038    5.5  21.0    6.8  -0.1001  -2.1   10.0	Vela X-1                      
170.6102 -60.6985    4.0  18.9  -89.0   0.1475   2.9    9.8	Cen X-3                       
187.0709 -62.8294    0.0  24.7 -104.2  -0.0600  -1.1   11.9	GX 301-2                      
154.6274 -14.9385    1.0  28.4   82.8   0.7994  11.0 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
80.068590 962.293300
1059.168000 1149.328000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.3443 -40.5831    7.9  30.7  -64.5  -1.6382  -1.5    8.6	Vela X-1                      
122.8172  15.2977    3.8  43.6   38.5   6.8414   3.1 ------	UNKNOWN                       
145.5522   4.4665    2.9  21.4   60.5   3.4056   4.0 ------	UNKNOWN                       
211.9411  -6.3388    3.0  56.8  173.9  14.6186   3.9 ------	UNKNOWN                       
212.6059  -9.0873    2.8  56.9  177.2  14.7126   4.1 ------	UNKNOWN                       
120.9337 -31.5239    3.0  34.9  -38.3   4.3163   3.9 ------	UNKNOWN                       
 92.2733 -19.2772    4.4  59.5  -17.8  10.3457   2.6 ------	UNKNOWN                       
213.3758 -31.8666    3.2  55.8 -155.3  12.3759   3.6 ------	UNKNOWN                       
208.3947 -37.1292    3.3  52.4 -148.3   8.8828   3.5 ------	UNKNOWN                       
127.9125 -48.2265    3.1  39.9  -66.1   7.3219   3.8 ------	UNKNOWN                       
114.5114 -46.8752    3.0  46.1  -56.3  12.1611   3.9 ------	UNKNOWN