GRB240421B

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 Oct 19 15:22:47 EDT 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1223470
======================================================================

  Trigger: 01223470      Segment: 000

  BAT Trigger Time: 735385407.36   [s; MET]
      Trigger Stop: 735385408.384   [s; MET]
               UTC: 2024-04-21T09:42:54.051140    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 299.685842854978   Dec: -14.8786960898768  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.05
     Image Trigger?:     NO
     Rate S/N Ratio:     79.4984276574072  [ if not an image trigger ]
     Image S/N Ratio:    11.05

  Analysis Position:   [ source = BAT ]
    RA: 299.685842854978   Dec: -14.8786960898768  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 299.68746243534   Dec: -14.8687329253373  [deg; J2000]
        { 19h 58m 45.0s , -14d 52' 07.4" }
         +/- 1.31407611430961 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.725809350844314 [arcmin] (formal 1-sigma fit error)
    SNR: 20.5901965549945
 
  Angular difference between the analysis and refined position is 0.605123 arcmin
 
  Partial Coding Fraction: 0.04736328    [ including projection effects ]

  Duration
     T90: 12.3999999761581 +/- 2.60387397090798
        Measured from: -6.35199999809265
                   to: 6.04799997806549     [s; relative to TRIGTIME]
     T50: 3.42400002479553 +/- 0.475175792697895
        Measured from: -1.85600006580353
                   to: 1.567999958992     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0600000619888306     
                   to: 0.939999938011169     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -7.10399997234344     
                   to: 8.04799997806549     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.642682   2.830908   2.827934   0.530176
           0.153456   0.165127   0.150672   0.100954 [error]
 Peak      0.380273   0.797105   0.896055   0.211679
           0.053859   0.069234   0.071579   0.046249 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   15.152   -7.104    8.048
T90    12.400   -6.352    6.048
T50     3.424   -1.856    1.568
Peak    1.000   -0.060    0.940
 
 
====== 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: CPL)
 
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      -1.537    -0.097      0.097       -           -               -         3.88e-02     -2.37e-03          2.37e-03      77.640   57
CPL     -0.369    -0.472      0.527       76.756      -9.240        16.788      1.36e-01     -5.27e-02          9.79e-02      57.220   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
 
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      -1.328     -0.137     0.136       -           -               -         1.62e-01     -1.50e-02          1.50e-02      61.110   57
CPL      0.286     -0.707     0.837       77.841     -10.916        20.506      9.29e-01     -4.88e-01          1.29e+00      43.260   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   7.77e-07  1.39e-06  1.92e-06  5.50e-06  5.54e-06  9.59e-06   erg/cm2
      90%_error_low -8.11e-08 -9.37e-08 -1.40e-07 -7.94e-07 -3.53e-07 -9.10e-07   erg/cm2
      90%_error_hi   8.37e-08  9.33e-08  1.40e-07  8.69e-07  3.54e-07  9.62e-07   erg/cm2
Peak flux       PL   5.66e+00  6.31e+00  5.02e+00  6.63e+00  1.94e+01  2.36e+01   ph/cm2/s
      90%_error_low -8.60e-01 -6.48e-01 -5.28e-01 -1.26e+00 -1.84e+00 -2.22e+00   ph/cm2/s
      90%_error_hi   8.99e-01  6.44e-01  5.24e-01  1.40e+00  1.85e+00  2.23e+00   ph/cm2/s
 
Fluence        CPL   6.00e-07  1.53e-06  2.17e-06  1.79e-06  5.35e-06  6.09e-06   erg/cm2
      90%_error_low -1.00e-07 -1.12e-07 -1.77e-07 -5.73e-07 -3.69e-07 -6.62e-07   erg/cm2
      90%_error_hi   1.04e-07  1.14e-07  1.80e-07  8.74e-07  3.69e-07  8.95e-07   erg/cm2
Peak flux      CPL   3.97e+00  7.16e+00  6.13e+00  2.21e+00  1.89e+01  1.95e+01   ph/cm2/s
      90%_error_low -1.01e+00 -8.03e-01 -7.21e-01 -8.46e-01 -1.86e+00 -2.05e+00   ph/cm2/s
      90%_error_hi   1.08e+00  8.19e-01  7.37e-01  1.23e+00  1.86e+00  2.13e+00   ph/cm2/s
 
======================================================================

Special notes of this burst

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  299.6875   -14.8687   0.0093    50.5347  -135.3335         9.7332068     20.590 TRIG_01223470                 
 
Foreground time interval of the image:
 -7.104   8.048 (delta_t =  15.152 [sec])
Background time interval of the image:
-239.360  -7.104 (delta_t = 232.256 [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

Bokeh Plot

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   -7.104 sec. to    8.048 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.53741     ( -0.0974261   0.0968861 )
Norm@50keV  : 3.87562E-02    ( -0.00237477   0.00237419 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   77.64     using 59 bins.
 Reduced chi-squared = 1.36211
# Null hypothesis probability of 3.59e-02 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 15.15 sec: 4.88877 ( -0.31939  0.32032 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.53839e-06 ( -3.53219e-07  3.54021e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -7.104 sec. to    8.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.368529     ( -0.47215   0.526796 )
Epeak [keV] : 76.7562      ( -9.24001 16.7879 )
Norm@50keV  : 0.135662    ( -0.0527268   0.0979045 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.22     using 59 bins.
 Reduced chi-squared = 1.02179
# Null hypothesis probability of 4.30e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 15.15 sec: 4.65650 ( -0.33032  0.33155 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.35134e-06 ( -3.68668e-07  3.68612e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.060 sec. to    0.940 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.32773     ( -0.136783   0.135937 )
Norm@50keV  : 0.162071    ( -0.0149614   0.014958 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   61.11     using 59 bins.
 Reduced chi-squared = 1.07211
# Null hypothesis probability of 3.30e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 19.4382 ( -1.8425  1.845 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.59115e-06 ( -1.57246e-07  1.57609e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.060 sec. to    0.940 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.285883     ( -0.707272   0.83717 )
Epeak [keV] : 77.8412      ( -10.9157 20.5061 )
Norm@50keV  : 0.929179    ( -0.487531   1.29278 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   43.26     using 59 bins.
 Reduced chi-squared = 0.7725
# Null hypothesis probability of 8.93e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 18.9069 ( -1.8592  1.8633 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.54618e-06 ( -1.6446e-07  1.64544e-07 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 12.4 sec.
Hardness ratio (energy fluence ratio) = 1.41876405509

S(15-50 keV) vs. S(50-150 keV) plot

S(15-50 keV)  = 2.1285178e-06
S(50-150 keV) = 3.222826e-06

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.

 IMX = -8.638342882200678E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -239.360000 -23.360000

# RAcent #  [deg] 170.0854 -60.6239 186.5094 -62.9001 244.9645 -15.6579 255.9878 -37.8850  193.9 256.4339 -36.4228 262.8425 -24.7685 264.7580 -44.2993 268.4110  -1.4293 270.4469 -25.0360 270.3532 -25.7724 274.1008 -13.9070 275.8772 -30.4836 285.0506 -24.9473 263.0007 -33.9939 239.8399   6.8998 259.2625 -46.7452 299.8541 -29.6419 295.8915  -6.7422 298.6006  -4.3180

Pre-slew

 Time interval of the image: -23.360000 7.640000

# RAcent #  [deg] 170.3895 -60.6001 186.5025 -62.6664 245.0607 -15.5600 255.7433 -37.9316 256.6724 -36.3340 262.9471 -24.5711 264.7866 -44.4677 268.2878  -1.3617 270.2019 -25.1078 270.3694 -25.9115 273.9068 -13.8578 275.9626 -30.5216 285.0913 -24.8553 262.9630 -33.6718 223.5781 -20.0829 274.0337 -81.6297 296.3854 -50.2872 299.6875 -14.8687

Post-slew

 Time interval of the image: 108.940600 962.665700

# RAcent #  [deg] 256.1620 -37.9822 256.4389 -36.5455 262.8771 -24.6162 264.6800 -44.5717 268.3304  -1.3251 270.2848 -25.0831 270.3024 -25.7431 273.8418 -13.9171 275.9322 -30.3698 285.0307 -24.9426 288.6394  11.0632 299.5991  35.2214 308.1417  40.9447 262.8134 -33.7723 295.0182 -55.0505 304.5996 -12.7690 325.1218  38.0167

Mask shadow pattern

IMY = 8.538362842692788E-01 source in the pre-burst/pre-slew/post-slew images image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 53.1 47.6 17.6 0.1717 0.2 6.8 Cen X-3 6.8 39.5 17.0 -0.9200 -1.7 8.8 GX 301-2 0.7 30.8 143.5 7.9754 17.3 1.4 Sco X-1 8.6 179.1 0.0189 0.1 2.4 4U 1700-377 3.2 10.1 178.2 1.1852 3.6 0.1 GX 349+2 8.8 22.9 -177.0 -0.4867 -1.3 9.2 GX 1+4 4.5 9.3 -118.7 0.9454 2.6 9.1 4U 1735-44 5.1 46.8 179.5 1.5478 2.2 2.9 SW J1753.5-0127 2.9 25.6 -161.5 1.4383 4.0 9.2 GX 5-1 4.7 25.0 -160.8 0.9058 2.5 3.3 GRS 1758-258 3.3 37.1 -165.9 1.4121 3.5 9.5 GX 17+2 20.8 24.2 -144.6 0.2024 0.6 7.4 H1820-303 88.2 33.8 -140.3 -0.0557 -0.1 1.8 HT1900.1-2455 5.0 14.6 -164.0 0.7353 2.3 9.6 GX 354-0 2.2 53.8 141.7 12.8608 5.2 ------ UNKNOWN 1.9 5.2 -101.2 2.0741 6.0 ------ UNKNOWN 2.8 40.6 -120.0 2.6367 4.1 ------ UNKNOWN 2.9 54.5 -145.5 5.6879 4.0 ------ UNKNOWN 2.6 58.0 -144.6 20.2317 4.5 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 6.6 47.4 17.7 0.3335 1.8 2.6 Cen X-3 5.4 39.5 17.4 0.2419 2.2 7.5 GX 301-2 13.5 30.8 143.7 0.0805 0.9 6.7 Sco X-1 0.0 8.5 178.0 0.0902 1.2 12.7 4U 1700-377 0.0 10.2 179.1 -0.0958 -1.2 12.6 GX 349+2 4.5 23.1 -177.0 -0.2056 -2.6 11.0 GX 1+4 4.6 9.2 -117.6 -0.1802 -2.5 2.2 4U 1735-44 3.4 46.8 179.3 -0.4867 -3.4 7.3 SW J1753.5-0127 3.9 25.5 -161.9 0.2373 3.0 4.8 GX 5-1 5.5 24.9 -160.6 -0.1662 -2.1 10.7 GRS 1758-258 0.0 37.0 -166.2 0.1499 1.5 12.2 GX 17+2 9.5 24.2 -144.4 -0.1008 -1.2 9.5 H1820-303 7.9 33.9 -140.4 -0.1635 -1.5 4.9 HT1900.1-2455 5.6 14.9 -164.7 0.1702 2.1 9.9 GX 354-0 2.4 34.7 105.1 0.6480 4.8 ------ UNKNOWN 2.5 36.5 -28.8 0.4779 4.6 ------ UNKNOWN 2.3 29.6 -88.6 0.5644 5.0 ------ UNKNOWN 0.6 50.5 -135.3 9.7333 20.6 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 6.5 44.7 62.4 12.6209 1.8 11.7 4U 1700-377 9.1 44.1 64.2 9.3606 1.3 7.3 GX 349+2 7.5 35.9 80.3 -4.8975 -1.5 10.6 GX 1+4 4.3 41.9 49.6 10.6315 2.6 7.8 4U 1735-44 6.7 33.8 122.6 3.9296 1.7 8.0 SW J1753.5-0127 35.9 29.4 77.0 0.6807 0.3 0.2 GX 5-1 9.0 29.5 75.6 2.8201 1.3 0.0 GRS 1758-258 0.0 25.1 100.8 2.7198 1.7 11.9 GX 17+2 82.7 26.8 62.5 -0.2322 -0.1 0.4 H1820-303 248.1 17.1 63.5 0.0527 0.0 1.4 HT1900.1-2455 0.0 28.2 168.4 -2.1268 -1.6 11.7 GRS 1915+105 1.4 50.1 -168.2 22.5906 8.2 1.3 Cyg X-1 5.7 56.4 -160.4 7.6700 2.0 1.5 Cyg X-3 4.8 38.3 65.6 7.7032 2.4 9.5 GX 354-0 2.3 40.3 16.1 8.7470 5.0 ------ UNKNOWN 2.2 5.2 -101.5 5.6570 5.2 ------ UNKNOWN 2.7 58.0 -144.6 63.8065 4.4 ------ UNKNOWN

Analysis Summary

Notes:

Image

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

Light Curves

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:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

S(15-50 keV) vs. S(50-150 keV) plot

IMX = -8.638342882200678E-01,

Spacecraft aspect plot

Bright

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