GRB211211A: 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 00:07:45 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1088940
======================================================================

  Trigger: 01088940      Segment: 000

  BAT Trigger Time: 660921027.872   [s; MET]
      Trigger Stop: 660921027.936   [s; MET]
               UTC: 2021-12-11T13:09:59.634260    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 212.272224151866   Dec: 27.883504540405  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.49
     Image Trigger?:     NO
     Rate S/N Ratio:     60.8769250208977  [ if not an image trigger ]
     Image S/N Ratio:    11.49

  Analysis Position:   [ source = BAT ]
    RA: 212.272224151866   Dec: 27.883504540405  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 212.271803402477   Dec: 27.884421505113  [deg; J2000]  
        { 14h 09m 05.2s , +27d 53' 03.9" }
         +/- 0.79868939817544 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.342010574338239 [arcmin] (formal 1-sigma fit error)
    SNR: 41.9351783873204
 
  Angular difference between the analysis and refined position is 0.059371 arcmin
 
  Partial Coding Fraction: 0.2167969    [ including projection effects ]

  Duration
     T90: 50.7119998931885 +/- 0.929240641376705
        Measured from: 2.932000041008
                   to: 53.6439999341965     [s; relative to TRIGTIME]
     T50: 21.1759999990463 +/- 0.163168721316993
        Measured from: 6.86000001430511
                   to: 28.0360000133514     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 6.8639999628067     
                   to: 7.8639999628067     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.00399994850158691     
                   to: 120.712000012398     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total    55.254222  80.111635  64.599144  18.663319
           0.228152   0.280279   0.275534   0.197466 [error]
 Peak      2.990676   6.009280   6.970394   2.669811
           0.063150   0.088958   0.100935   0.080485 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  120.716   -0.004  120.712
T90    50.712    2.932   53.644
T50    21.176    6.860   28.036
Peak    1.000    6.864    7.864
 
 
====== 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      -1.515    -0.020      0.020       -           -               -         1.27e-01     -1.58e-03          1.57e-03      29.530   57
CPL     -1.442    -0.066      0.084      512.674    -234.629      -512.674      1.36e-01     -5.64e-03          9.89e-03      27.260   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      -1.036     -0.033     0.034       -           -               -         1.35e+00     -2.61e-02          2.61e-02      58.330   57
CPL     -0.734     -0.141     0.146      260.076     -64.122       166.860      1.79e+00     -2.20e-01          2.58e-01      44.780   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   1.99e-05  3.63e-05  5.07e-05  1.49e-04  1.46e-04  2.55e-04   erg/cm2
      90%_error_low -5.41e-07 -6.04e-07 -5.52e-07 -3.61e-06 -1.62e-06 -3.63e-06   erg/cm2
      90%_error_hi   5.48e-07  6.04e-07  5.51e-07  3.67e-06  1.62e-06  3.65e-06   erg/cm2
Peak flux       PL   9.43e-03  1.30e-01  1.48e+00  1.29e+02  6.72e+00  1.28e+02   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
 
Fluence        CPL   1.94e-05  3.62e-05  5.12e-05  1.39e-04  1.45e-04  2.46e-04   erg/cm2
      90%_error_low -7.89e-07 -6.11e-07 -7.30e-07 -9.94e-06 -1.67e-06 -1.01e-05   erg/cm2
      90%_error_hi   7.73e-07  6.10e-07  7.66e-07  1.02e-05  1.66e-06  1.05e-05   erg/cm2
Peak flux      CPL   3.23e+01  4.75e+01  4.79e+01  6.22e+01  1.53e+02  1.90e+02   ph/cm2/s
      90%_error_low -1.99e+00 -1.24e+00 -1.23e+00 -6.86e+00 -3.27e+00 -7.82e+00   ph/cm2/s
      90%_error_hi   2.04e+00  1.24e+00  1.24e+00  7.95e+00  3.28e+00  8.75e+00   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  212.2718    27.8844   0.0046    41.5073   -53.3807        90.1512993     41.935 TRIG_01088940                 
 
Foreground time interval of the image:
 -0.004   8.829 (delta_t =   8.833 [sec])
Background time interval of the image:
-239.872  -0.004 (delta_t = 239.868 [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   -0.004 sec. to  120.712 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.51526     ( -0.0202739   0.0203569 )
Norm@50keV  : 0.127390    ( -0.00157609   0.0015727 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   29.53     using 59 bins.
 Reduced chi-squared = 0.51807
# Null hypothesis probability of 9.99e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 120.7 sec: 15.9699 ( -0.2528  0.2538 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0.000145524 ( -1.62222e-06  1.62461e-06 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.004 sec. to  120.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.442     ( -0.0663039   0.0838663 )
Epeak [keV] : 512.674      ( -234.723 -512.768 )
Norm@50keV  : 0.135641    ( -0.00563691   0.00989233 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   27.26     using 59 bins.
 Reduced chi-squared = 0.486786
# Null hypothesis probability of 1.00e+00 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 120.7 sec: 15.8328 ( -0.2916  0.2933 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0.000145184 ( -1.6657e-06  1.66374e-06 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    6.864 sec. to    7.864 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.03556     ( -0.0334794   0.033601 )
Norm@50keV  : 1.34635    ( -0.0261386   0.0261007 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.33     using 59 bins.
 Reduced chi-squared = 1.02333
# Null hypothesis probability of 4.26e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 6.71672 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.4381e-05 ( -2.80971e-07  2.81229e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    6.864 sec. to    7.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.733944     ( -0.141499   0.145742 )
Epeak [keV] : 260.076      ( -64.1228 166.86 )
Norm@50keV  : 1.79165    ( -0.220177   0.257982 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   44.78     using 59 bins.
 Reduced chi-squared = 0.799643
# Null hypothesis probability of 8.59e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 153.088 ( -3.269  3.277 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.42722e-05 ( -2.8889e-07  2.88424e-07 ) 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 = 5.278701697646530E-01, IMY = 7.102783141836446E-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:
-239.872000 -0.004000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3096  35.2453    5.3  42.3 -109.0   2.1191   2.1    9.3	Her X-1                       
299.5713  35.1816    2.3  57.8 -153.2   6.7138   5.1    1.5	Cyg X-1                       
308.0181  40.8896   33.1  55.4 -163.3   0.2755   0.3    5.6	Cyg X-3                       
147.7311  44.6136    2.6  38.7   34.6   1.9117   4.4 ------	UNKNOWN                       
153.0440  58.1247    2.7  25.7   44.3   1.2440   4.3 ------	UNKNOWN                       
321.5356  59.1191    3.0  43.0  175.7   1.6180   3.9 ------	UNKNOWN                       
219.3348  60.8968    2.9   9.6  -82.1   0.8837   4.0 ------	UNKNOWN                       
290.9543  44.0271    2.8  46.9 -150.7   1.9664   4.1 ------	UNKNOWN                       
201.6065  20.9066    2.7  48.6  -39.7   3.3819   4.3 ------	UNKNOWN                       

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

Time interval of the image:
-0.004000 8.828590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5773  35.2081   27.5  42.4 -109.3  -1.5751  -0.4   10.0	Her X-1                       
299.6359  35.2928   11.1  57.7 -153.3   5.3745   1.0    5.9	Cyg X-1                       
308.1691  41.0011    5.3  55.4 -163.4  -4.5042  -2.2    3.9	Cyg X-3                       
166.5590  28.8358    4.0  47.0    4.8   2.5673   2.9 ------	UNKNOWN                       
291.2931  42.3066    2.9  48.6 -149.9   6.9550   4.0 ------	UNKNOWN                       
189.5919  14.4932    3.6  56.1  -26.1  13.2183   3.2 ------	UNKNOWN                       
212.2718  27.8844    0.3  41.5  -53.4  90.1559  41.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
68.228590 298.228600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4374  35.3701    3.0  36.4 -156.3   1.3132   3.8    1.9	Her X-1                       
212.2672  27.8813    0.6   0.0  -10.9   4.1266  18.6 ------	UNKNOWN                       
206.7197  11.5751    3.6  17.1  -24.9   0.7244   3.2 ------	UNKNOWN                       
218.3481  20.2646    2.5   9.4  -81.0   1.1050   4.7 ------	UNKNOWN                       
262.8109  23.5846    3.7  45.4 -140.2   1.7720   3.2 ------	UNKNOWN