GRB240516A

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 Nov 16 17:37:19 EST 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1228797
======================================================================

  Trigger: 01228797      Segment: 000

  BAT Trigger Time: 737523421.76   [s; MET]
      Trigger Stop: 737523422.784   [s; MET]
               UTC: 2024-05-16T03:36:28.304860    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 212.770476713133   Dec: -63.5049126358497  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.02
     Image Trigger?:     NO
     Rate S/N Ratio:     15.8113883008419  [ if not an image trigger ]
     Image S/N Ratio:    7.02

  Analysis Position:   [ source = BAT ]
    RA: 212.770476713133   Dec: -63.5049126358497  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 212.783117894027   Dec: -63.4935184508366  [deg; J2000]  
        { 14h 11m 07.9s , -63d 29' 36.7" }
         +/- 1.64449363365327 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.737380693548003 [arcmin] (formal 1-sigma fit error)
    SNR: 14.9451733346865
 
  Angular difference between the analysis and refined position is 0.762836 arcmin
 
  Partial Coding Fraction: 0.4570312    [ including projection effects ]

  Duration
     T90: 85.1199998855591 +/- 31.1484784603325
        Measured from: -3.66400003433228
                   to: 81.4559998512268     [s; relative to TRIGTIME]
     T50: 28.2879999876022 +/- 9.80286968393864
        Measured from: 1.39199995994568
                   to: 29.6799999475479     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0360000133514404     
                   to: 0.96399998664856     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.75199997425079     
                   to: 112.496000051498     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.541978   0.849380   0.865236   0.482731
           0.100470   0.092753   0.076767   0.063178 [error]
 Peak      0.018732   0.017982   0.050627   0.036445
           0.012317   0.011707   0.010138   0.008710 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  117.248   -4.752  112.496
T90    85.120   -3.664   81.456
T50    28.288    1.392   29.680
Peak    1.000   -0.036    0.964
 
 
====== 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: PL)
 
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      -1.033    -0.190      0.201       -           -               -         1.57e-03     -1.68e-04          1.64e-04      64.210   57
CPL     -1.041    -0.178      0.218     9999.360    -9999.360      -9999.360      1.59e-03     -1.74e-04          1.42e-04      64.300   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      -0.332     -0.609     0.778       -           -               -         6.18e-03     -6.18e-03          2.79e-03      46.810   57
CPL      0.320     -0.243    -0.320      308.609    -215.878      -308.609      8.76e-03     -8.76e-03          9.54e-01      46.710   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   1.52e-07  3.73e-07  7.29e-07  3.52e-06  1.97e-06  4.77e-06   erg/cm2
      90%_error_low -3.58e-08 -5.41e-08 -7.09e-08 -7.96e-07 -1.87e-07 -8.11e-07   erg/cm2
      90%_error_hi   3.94e-08  5.28e-08  7.04e-08  9.75e-07  1.87e-07  9.62e-07   erg/cm2
Peak flux       PL   8.41e-02  1.71e-01  2.72e-01  9.61e-01  7.56e-01  1.49e+00   ph/cm2/s
      90%_error_low -8.41e-02 -9.86e-02 -8.59e-02 -4.63e-01 -2.53e-01 -4.44e-01   ph/cm2/s
      90%_error_hi   1.15e-01  1.19e-01  7.97e-02  7.94e-01  2.78e-01  6.39e-01   ph/cm2/s
 
Fluence        CPL   1.64e-07  3.76e-07  7.29e-07  3.49e-06  1.98e-06  4.56e-06   erg/cm2
      90%_error_low -4.80e-08 -5.70e-08 -7.09e-08 -9.49e-07 -1.93e-07 -8.75e-07   erg/cm2
      90%_error_hi   2.73e-08  5.00e-08  7.04e-08  9.71e-07  1.81e-07  1.17e-06   erg/cm2
Peak flux      CPL   4.40e-02  1.45e-01  2.86e-01  9.60e-01  7.37e-01  1.46e+00   ph/cm2/s
      90%_error_low -4.40e-02 -1.45e-01 -9.70e-02 -9.60e-01 -3.28e-01 -1.02e+00   ph/cm2/s
      90%_error_hi   1.48e-01  1.42e-01  1.36e-01  4.05e-01  2.90e-01  1.44e-01   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
  212.7831   -63.4935   0.0129    43.2395    -3.3337         1.5243196     14.945 TRIG_01228797                 
 
Foreground time interval of the image:
 -4.752  15.341 (delta_t =  20.093 [sec])
Background time interval of the image:
-131.659  -4.752 (delta_t = 126.907 [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   -4.752 sec. to  112.496 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.03293     ( -0.189686   0.200908 )
Norm@50keV  : 1.57214E-03    ( -0.000168354   0.0001637 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.21     using 59 bins.
 Reduced chi-squared = 1.12649
# Null hypothesis probability of 2.39e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 117.2 sec: 0.181355 ( -0.020203  0.020423 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.96992e-06 ( -1.86772e-07  1.87116e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -4.752 sec. to  112.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.02766     ( -0.178313   0.216833 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 1.58128E-03    ( -0.000168627   0.000147593 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.28     using 59 bins.
 Reduced chi-squared = 1.14786
# Null hypothesis probability of 2.09e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 117.2 sec: 0.181377 ( -0.02027  0.020359 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.97541e-06 ( -1.93242e-07  1.80936e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.036 sec. to    0.964 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.332172     ( -0.608688   0.777687 )
Norm@50keV  : 6.17718E-03    ( -0.00617718   0.00278931 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   46.81     using 59 bins.
 Reduced chi-squared = 0.821228
# Null hypothesis probability of 8.30e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.756256 ( -0.253011  0.278384 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.07006e-08 ( -2.41518e-08  2.41518e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.036 sec. to    0.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.39617     ( -3.2254   -3.30248 )
Epeak [keV] : 131.412      ( -40.5575 -133.289 )
Norm@50keV  : 3.54257E-02    ( -0.0319729   0.930729 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   46.66     using 59 bins.
 Reduced chi-squared = 0.833214
# Null hypothesis probability of 8.09e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.736919 ( -0.328061  0.290101 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.3947e-10 ( -6.39439e-10  1.79458e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 85.12 sec.
Hardness ratio (energy fluence ratio) = 1.95492417881

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

S(15-50 keV)  = 5.249386e-07
S(50-150 keV) = 1.4449532e-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 = 9.387684073228436E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -131.659400 -4.752000

# RAcent #  [deg] 186.8055 -62.7831 244.9694 -15.6456 256.0295 -37.8432 256.2970 -36.3818 263.0224 -24.6859 264.9079 -44.5448 268.3675 270.1614 -25.1911 270.3583 -25.6164 274.0218 -14.0795 276.0207 -30.3456 284.9076 -24.7954 288.9355  11.0415 262.9994 -33.8247

Pre-slew

 Time interval of the image: -4.752000 15.340590

# RAcent #  [deg] 186.5802 -62.6851 245.0679 -15.5256 255.8227 -37.7704 256.6321 -36.3437 263.0269 -24.7788  208.0 264.8950 -44.3401 268.3260  -1.3338 270.1120 -25.0660 270.2713 -25.8395 274.1961 -13.9589 276.1435 -30.2868 285.1947 -24.9305 288.7976  10.9461 263.0102 -34.0126 223.1226 -58.9937 212.7831 -63.4935 260.5267 -82.4603

Post-slew

 Time interval of the image: 128.940610 962.281100

# RAcent #  [deg] 135.5404 -40.5476 170.3206 -60.6208 186.2052 -62.7485 255.8365 -37.8913 256.3467 -36.2859 264.5826 -44.5466 263.0042 -33.8071 176.6652 -26.6411 305.6220 -42.3450 177.8898 -39.0481 140.8923 -39.7646 130.3136 -49.9885

Mask shadow pattern

IMY = 5.468377136323409E-02 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] ['] 19.8 54.4 1.4 -0.3802 -0.6 4.2 GX 301-2 0.7 18.9 108.9 4.7752 17.7 0.7 Sco X-1 1.5 7.3 -20.9 1.8758 8.0 2.0 4U 1700-377 3.8 5.8 -20.3 0.7065 3.0 7.1 GX 349+2 3.4 7.7 -170.5 0.7465 3.4 3.7 GX 1+4 4.9 15.0 -51.1 0.5197 2.4 9.1 4U 1735-44 -1.4530 152.4 30.9 170.7 -0.0225 -0.1 0.0 SW J1753.5-0127 3.6 12.4 -143.8 0.7622 3.4 9.5 GX 5-1 3.7 12.3 -141.6 0.8028 3.6 8.2 GRS 1758-258 2.1 22.4 -164.7 1.3055 5.5 2.8 GX 17+2 4.9 15.9 -117.0 0.5445 2.3 5.1 H1820-303 3.5 24.8 -127.6 0.8149 3.3 10.3 HT1900.1-2455 0.0 51.4 -169.9 0.5813 0.9 9.9 GRS 1915+105 5.7 5.6 -84.4 0.4431 2.0 0.8 GX 354-0 background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 7.2 54.5 1.6 -0.3821 -1.6 5.5 GX 301-2 8.6 19.0 109.3 0.0907 1.3 8.6 Sco X-1 3.4 7.3 -19.5 0.1934 3.4 8.9 4U 1700-377 15.6 5.8 -22.9 0.0427 0.7 10.6 GX 349+2 7.6 -170.0 0.0031 0.1 2.2 GX 1+4 40.1 14.9 -51.4 -0.0182 -0.3 9.3 4U 1735-44 2.6 31.0 170.5 -0.3058 -4.4 7.6 SW J1753.5-0127 3.4 12.4 -144.4 -0.2001 -3.4 9.4 GX 5-1 6.2 12.1 -140.8 0.1089 1.9 6.0 GRS 1758-258 0.0 22.6 -164.5 -0.0772 -1.2 12.0 GX 17+2 0.0 16.0 -117.2 -0.0610 -0.9 12.3 H1820-303 16.8 25.0 -127.0 -0.0498 -0.7 8.7 HT1900.1-2455 39.6 51.3 -170.0 0.0439 0.3 0.1 GRS 1915+105 9.4 5.7 -82.9 0.0740 1.2 10.7 GX 354-0 2.1 36.7 -1.4 0.4277 5.5 ------ UNKNOWN 0.8 43.2 -3.3 1.5245 14.9 ------ UNKNOWN 3.0 51.8 -31.2 0.7660 3.8 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 26.4 48.9 -37.9 0.2401 0.4 0.7 Vela X-1 113.9 19.7 -38.3 -0.0186 -0.1 0.2 Cen X-3 0.0 11.9 -35.6 0.5394 3.3 12.5 GX 301-2 4.2 36.2 128.6 1.0251 2.8 7.6 4U 1700-377 5.9 37.8 127.8 0.8266 2.0 9.3 GX 349+2 7.0 34.5 144.5 -0.5023 -1.6 9.0 4U 1735-44 46.9 42.7 133.2 0.1521 0.2 1.8 GX 354-0 2.4 43.6 13.1 1.4553 4.9 ------ UNKNOWN 2.3 54.1 177.1 3.3350 5.1 ------ UNKNOWN 2.7 32.0 5.9 0.9216 4.3 ------ UNKNOWN 2.3 47.2 -32.8 2.0095 4.9 ------ UNKNOWN 2.2 43.7 -49.9 2.3358 5.3 ------ 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 = 9.387684073228436E-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