GRB220101A: 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: Sun Oct 23 23:52:32 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1091527
======================================================================

  Trigger: 01091527      Segment: 000

  BAT Trigger Time: 662706639.872   [s; MET]
      Trigger Stop: 662706640.896   [s; MET]
               UTC: 2022-01-01T05:10:11.514060    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 1.37998432654438   Dec: 31.7525909746098  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.24
     Image Trigger?:     NO
     Rate S/N Ratio:     20.3960780543711  [ if not an image trigger ]
     Image S/N Ratio:    11.24

  Analysis Position:   [ source = BAT ]
    RA: 1.37998432654438   Dec: 31.7525909746098  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 1.36213632842002   Dec: 31.7582780258658  [deg; J2000]  
        { 00h 05m 26.9s , +31d 45' 29.8" }
         +/- 2.19766030123086 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.906989735109814 [arcmin] (formal 1-sigma fit error)
    SNR: 9.87650504315148
 
  Angular difference between the analysis and refined position is 0.972406 arcmin
 
  Partial Coding Fraction: 0.6484375    [ including projection effects ]

  Duration
     T90: 161.888000011444 +/- 12.7097258213482
        Measured from: 3.03999996185303
                   to: 164.927999973297     [s; relative to TRIGTIME]
     T50: 36.9199999570847 +/- 1.02391410648819
        Measured from: 77.5640000104904
                   to: 114.483999967575     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 89.0720000267029     
                   to: 90.0720000267029     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -58.0759999752045     
                   to: 259.103999972343     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     8.141589  12.661661  11.651156   3.393386
           0.131823   0.141000   0.129137   0.110378 [error]
 Peak      0.165280   0.292819   0.324142   0.101592
           0.009325   0.011492   0.011857   0.008243 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  317.180  -58.076  259.104
T90   161.888    3.040  164.928
T50    36.920   77.564  114.484
Peak    1.000   89.072   90.072
 
 
====== 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      -1.265    -0.031      0.031       -           -               -         7.49e-03     -1.25e-04          1.24e-04      42.090   57
CPL     -1.159    -0.083      0.127      483.172    -251.493      -483.172      8.28e-03     -8.10e-04          1.03e-03      39.980   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      -1.011     -0.070     0.070       -           -               -         5.79e-02     -2.35e-03          2.35e-03      61.570   57
CPL     -0.723     -0.257     0.289      252.874     -98.172      1939.586      7.81e-02     -1.77e-02          2.64e-02      58.270   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   2.44e-06  5.17e-06  8.60e-06  3.26e-05  2.37e-05  4.88e-05   erg/cm2
      90%_error_low -8.96e-08 -1.11e-07 -1.50e-07 -1.36e-06 -3.87e-07 -1.40e-06   erg/cm2
      90%_error_hi   9.12e-08  1.11e-07  1.50e-07  1.40e-06  3.87e-07  1.44e-06   erg/cm2
Peak flux       PL   6.99e-04  6.62e-03  9.71e-02  8.65e+00  4.52e-01  8.44e+00   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   2.36e-06  5.18e-06  8.70e-06  2.87e-05  2.36e-05  4.50e-05   erg/cm2
      90%_error_low -1.25e-07 -1.13e-07 -1.85e-07 -3.89e-06 -4.12e-07 -3.87e-06   erg/cm2
      90%_error_hi   1.23e-07  1.13e-07  1.86e-07  3.66e-06  4.12e-07  4.18e-06   erg/cm2
Peak flux      CPL   1.39e+00  2.05e+00  2.07e+00  2.66e+00  6.60e+00  8.17e+00   ph/cm2/s
      90%_error_low -1.51e-01 -1.07e-01 -1.12e-01 -6.26e-01 -2.82e-01 -6.85e-01   ph/cm2/s
      90%_error_hi   1.54e-01  1.08e-01  1.14e-01  8.22e-01  2.81e-01  8.79e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
    1.3621    31.7583   0.0194    33.4785  -148.7279         2.8689191      9.877 TRIG_01091527                 
 
Foreground time interval of the image:
-58.076  15.429 (delta_t =  73.505 [sec])
Background time interval of the image:
-77.971 -58.076 (delta_t =  19.895 [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  -58.076 sec. to  259.104 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.26493     ( -0.0309777   0.0310811 )
Norm@50keV  : 7.49179E-03    ( -0.000124648   0.000124408 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   42.09     using 59 bins.
 Reduced chi-squared = 0.738421
# Null hypothesis probability of 9.30e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 317.2 sec: 0.888279 ( -0.016628  0.016677 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.36932e-05 ( -3.86867e-07  3.87212e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -58.076 sec. to  259.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.15911     ( -0.0825308   0.12707 )
Epeak [keV] : 483.172      ( -251.53 -483.209 )
Norm@50keV  : 8.28414E-03    ( -0.000809783   0.001034 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   39.98     using 59 bins.
 Reduced chi-squared = 0.713929
# Null hypothesis probability of 9.48e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 317.2 sec: 0.880734 ( -0.018617  0.018713 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.35718e-05 ( -4.12116e-07  4.11703e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   89.072 sec. to   90.072 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.01129     ( -0.0696308   0.0700457 )
Norm@50keV  : 5.78728E-02    ( -0.00234945   0.00234852 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   61.57     using 59 bins.
 Reduced chi-squared = 1.08018
# Null hypothesis probability of 3.16e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.451564 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.2339e-07 ( -2.81803e-08  2.82534e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   89.072 sec. to   90.072 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.723284     ( -0.256981   0.28937 )
Epeak [keV] : 252.874      ( -98.1726 1939.59 )
Norm@50keV  : 7.81066E-02    ( -0.017721   0.0264016 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.27     using 59 bins.
 Reduced chi-squared = 1.04054
# Null hypothesis probability of 3.92e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 6.60039 ( -0.28159  0.28148 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.15375e-07 ( -2.96281e-08  2.94918e-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 = -5.652594020079352E-01, IMY = 3.433067346143954E-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:
-77.971400 -58.076000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.1673  38.4735    5.7  40.5 -100.1  -0.4560  -2.0    9.1	Cyg X-2                       
 74.9262  37.1519    2.4  41.4  102.8   1.1095   4.8 ------	UNKNOWN                       
177.6184  63.0993    2.1  52.8   13.5   1.0946   5.5 ------	UNKNOWN                       
 61.7865  69.0604    3.2  17.4   52.3   0.2216   3.6 ------	UNKNOWN                       
182.7380  69.5401    2.9  47.0    9.1   0.4529   4.0 ------	UNKNOWN                       
352.8880  36.4851    2.1  31.4 -133.4   0.3986   5.6 ------	UNKNOWN                       

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

Time interval of the image:
-58.076000 15.428600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.2370  38.3789   12.2  40.5 -100.3   0.8713   0.9    4.6	Cyg X-2                       
  1.3621  31.7583    1.2  33.5 -148.7   2.8687   9.9 ------	UNKNOWN                       
358.0745  34.4678    2.1  31.7 -142.3   1.5142   5.5 ------	UNKNOWN                       
235.3905  57.6654    2.3  56.5  -20.8   5.1316   5.1 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
69.428590 240.428600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.4166  35.1663    9.8  51.0  -43.3  -2.3989  -1.2    8.8	Cyg X-1                       
308.2142  40.9555    5.4  43.1  -37.2   1.5807   2.1    4.7	Cyg X-3                       
325.9490  38.3346    9.7  29.6  -42.2  -0.5642  -1.2   10.5	Cyg X-2                       
  1.3601  31.7760    0.1   0.0  -76.8  28.3873  89.1 ------	UNKNOWN                       
350.1429  -0.3540    2.7  33.9 -134.5   2.3129   4.3  591.8	UNKNOWN