GRB220305A: 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 23:38:29 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1095215
======================================================================

  Trigger: 01095215      Segment: 000

  BAT Trigger Time: 668189617.344   [s; MET]
      Trigger Stop: 668189618.368   [s; MET]
               UTC: 2022-03-05T16:13:08.615740    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 107.584441518432   Dec: -37.708465082534  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.18
     Image Trigger?:     NO
     Rate S/N Ratio:     14  [ if not an image trigger ]
     Image S/N Ratio:    7.18

  Analysis Position:   [ source = BAT ]
    RA: 107.584441518432   Dec: -37.708465082534  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 107.608224012885   Dec: -37.7006078126076  [deg; J2000]  
        { 07h 10m 26.0s , -37d 42' 02.2" }
         +/- 1.49808242785694 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.59284396395132 [arcmin] (formal 1-sigma fit error)
    SNR: 17.074699930472
 
  Angular difference between the analysis and refined position is 1.223445 arcmin
 
  Partial Coding Fraction: 0.2539062    [ including projection effects ]

  Duration
     T90: 28 +/- 5.3851648071345
        Measured from: -9.34399998188019
                   to: 18.6560000181198     [s; relative to TRIGTIME]
     T50: 11 +/- 3.60555127546399
        Measured from: -5.34399998188019
                   to: 5.65600001811981     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.343999981880188     
                   to: 0.656000018119812     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -10.3439999818802     
                   to: 21.6560000181198     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.964491   1.344452   0.891096   0.325929
           0.093715   0.099411   0.086990   0.075447 [error]
 Peak      0.052734   0.109153   0.063392   0.052349
           0.017919   0.019970   0.018125   0.015663 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   32.000  -10.344   21.656
T90    28.000   -9.344   18.656
T50    11.000   -5.344    5.656
Peak    1.000   -0.344    0.656
 
 
====== 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      -1.649    -0.151      0.149       -           -               -         7.35e-03     -6.52e-04          6.46e-04      51.770   57
CPL     -1.581    -0.733      0.585      271.895    -271.895      -271.895      7.98e-03     -4.62e-03          7.87e-03      51.750   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      -1.581     -0.401     0.376       -           -               -         1.47e-02     -3.88e-03          3.82e-03      73.310   57
CPL     -0.043     -1.629     3.772       59.925     -19.418       -59.925      9.71e-02     -9.71e-02          1.62e+01      70.750   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   3.46e-07  5.80e-07  7.40e-07  1.89e-06  2.19e-06  3.56e-06   erg/cm2
      90%_error_low -4.71e-08 -4.96e-08 -8.73e-08 -4.31e-07 -2.05e-07 -5.12e-07   erg/cm2
      90%_error_hi   4.87e-08  4.95e-08  8.70e-08  5.10e-07  2.07e-07  5.73e-07   erg/cm2
Peak flux       PL   6.56e-01  6.29e-01  4.21e-01  4.38e-01  1.88e+00  2.14e+00   ph/cm2/s
      90%_error_low -2.35e-01 -1.61e-01 -1.35e-01 -2.21e-01 -4.71e-01 -5.39e-01   ph/cm2/s
      90%_error_hi   2.57e-01  1.60e-01  1.34e-01  3.12e-01  4.72e-01  5.44e-01   ph/cm2/s
 
Fluence        CPL   3.21e-07  4.37e-07  4.58e-07  1.08e-06  1.51e-06  2.29e-06   erg/cm2
      90%_error_low -6.39e-08 -8.13e-08 -5.87e-08 -1.90e-07 -2.22e-07 -4.28e-07   erg/cm2
      90%_error_hi   5.96e-08  6.87e-08  5.11e-08  1.66e-07  1.84e-07  3.98e-07   erg/cm2
Peak flux      CPL   5.28e-01  7.44e-01  4.61e-01  1.09e-01  1.82e+00  1.84e+00   ph/cm2/s
      90%_error_low -2.60e-01 -2.09e-01 -2.14e-01 -1.09e-01 -4.76e-01 -4.94e-01   ph/cm2/s
      90%_error_hi   2.90e-01  2.51e-01  1.70e-01  4.00e-01  4.77e-01  5.40e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  107.6082   -37.7006   0.0113    38.1023   -67.8705         3.7287540     17.075 TRIG_01095215                 
 
Foreground time interval of the image:
-10.344  21.656 (delta_t =  32.000 [sec])
Background time interval of the image:
-239.344 -10.344 (delta_t = 229.000 [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  -10.344 sec. to   21.656 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.6495     ( -0.151307   0.148929 )
Norm@50keV  : 7.35413E-03    ( -0.000652369   0.00064636 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.77     using 59 bins.
 Reduced chi-squared = 0.908246
# Null hypothesis probability of 6.71e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 32 sec: 0.960149 ( -0.081933  0.082081 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.18907e-06 ( -2.05354e-07  2.07332e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -10.344 sec. to   21.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.58113     ( -0.731281   0.587016 )
Epeak [keV] : 271.895      ( -306.414 -306.414 )
Norm@50keV  : 7.98460E-03    ( -0.00458791   0.00789829 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.75     using 59 bins.
 Reduced chi-squared = 0.924107
# Null hypothesis probability of 6.36e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 32 sec: 0.957452 ( -0.084819  0.083808 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.51109e-06 ( -2.22364e-07  1.84108e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.344 sec. to    0.656 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.58127     ( -0.400593   0.376793 )
Norm@50keV  : 1.47471E-02    ( -0.00388297   0.00382088 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   73.31     using 59 bins.
 Reduced chi-squared = 1.28614
# Null hypothesis probability of 7.17e-02 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.88437 ( -0.47139  0.47223 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.38242e-07 ( -3.81222e-08  3.89606e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.344 sec. to    0.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.0433042     ( -1.62907   3.77147 )
Epeak [keV] : 59.9251      ( -19.4106 -59.9175 )
Norm@50keV  : 9.70587E-02    ( -0.0971181   16.2215 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   70.75     using 59 bins.
 Reduced chi-squared = 1.26339
# Null hypothesis probability of 8.87e-02 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.82230 ( -0.47638  0.47748 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.26567e-07 ( -4.19788e-08  4.22943e-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 = 2.953964282958187E-01, IMY = 7.263992495613288E-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:
-239.344000 -10.344000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5348 -40.3591   55.0  19.1  -91.5   0.0749   0.2   11.7	Vela X-1                      
170.3072 -60.4836   86.9  36.9 -145.1   0.0642   0.1    8.4	Cen X-3                       
186.8894 -62.8966    0.0  43.8 -152.0   1.6260   2.7    9.9	GX 301-2                      
163.8102  11.5674    3.9  39.7   71.0   2.9821   3.0 ------	UNKNOWN                       
116.6887  19.1240    3.7  56.0   11.1   4.8555   3.1 ------	UNKNOWN                       
175.2085 -24.6262    2.8  22.1  142.5   1.4037   4.1 ------	UNKNOWN                       
133.3740 -20.2739    2.5  17.0  -23.0   1.3190   4.7 ------	UNKNOWN                       

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

Time interval of the image:
-10.344000 21.656000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4021 -40.6720   14.2  19.4  -91.9   0.0825   0.8    9.1	Vela X-1                      
170.2022 -60.4733    4.5  36.9 -145.0   0.3585   2.5    9.6	Cen X-3                       
186.5769 -62.7286    6.7  43.6 -152.1   0.2940   1.7    3.3	GX 301-2                      
178.0365 -22.4955    2.0  25.1  138.5   0.5784   5.6 ------	UNKNOWN                       
214.9254 -64.0008    2.4  55.5 -157.8   1.7096   4.7 ------	UNKNOWN                       
107.6082 -37.7006    0.7  38.1  -67.9   3.7286  17.0 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
295.756590 962.782400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.3269 -60.7456   30.1  47.0   33.1  -0.7511  -0.4    7.4	Cen X-3                       
186.3251 -62.7465    7.0  39.2   34.0  -2.6850  -1.6    9.2	GX 301-2                      
244.9756 -15.6419    0.7  34.3  152.7  23.0228  17.0    0.2	Sco X-1                       
255.7729 -37.9706    0.0  10.8  171.5   0.6017   0.7   12.6	4U 1700-377                   
256.4310 -36.4291    8.5  12.4  173.9   1.1065   1.3    0.4	GX 349+2                      
263.0779 -24.8894   14.4  24.6 -172.5  -0.7436  -0.8    9.4	GX 1+4                        
264.6276 -44.5887    3.9   7.4 -130.1   2.4283   3.0    9.7	4U 1735-44                    
268.4718  -1.5840   38.1  48.5 -171.6  -0.5731  -0.3   10.0	SW J1753.5-0127               
270.1260 -24.9264    0.0  26.4 -158.3  -0.7359  -0.8   12.6	GX 5-1                        
270.4561 -25.7593    6.5  25.8 -156.9  -1.6639  -1.8    8.4	GRS 1758-258                  
274.1024 -13.8944    7.9  38.1 -159.0   1.8417   1.5   10.2	GX 17+2                       
275.9214 -30.3653  255.2  24.0 -141.6  -0.0431  -0.0    0.2	H1820-303                     
285.1902 -24.9070    5.7  33.2 -134.1  -2.7302  -2.0    8.4	HT1900.1-2455                 
262.8170 -33.8195    3.9  15.9 -166.7   2.5385   3.0    8.6	GX 354-0                      
287.1208 -19.4272    4.6  38.7 -136.9   4.0017   2.5 ------	UNKNOWN                       
 17.9931 -71.9524    3.9  52.7  -28.0  11.4302   3.0 ------	UNKNOWN                       
302.8447 -30.1332    4.6  40.1 -108.8   8.8600   2.5 ------	UNKNOWN