batgrbproduct analysis for trigger=1321323

batgrbproduct Analysis for Trigger=1321323

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 (local time): Thu Jun 19 20:26:33 EDT 2025
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1321323
======================================================================

  Trigger: 01321323      Segment: 000

  BAT Trigger Time: 770842387.008   [s; MET]
      Trigger Stop: 770842388.032   [s; MET]
               UTC: 2025-06-05T18:52:31.274380    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 166.976975771878   Dec: -19.7948394952968  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    15.53
     Image Trigger?:     NO
     Rate S/N Ratio:     53.507008886687  [ if not an image trigger ]
     Image S/N Ratio:    15.53

  Flight Position:   [ source = BAT ]
    RA: 166.976975771878   Dec: -19.7948394952968  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 166.962774612972   Dec: -19.7859449720484  [deg; J2000]  
        { 11h 07m 51.1s , -19d 47' 09.4" }
         +/- 1.13903145531156 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.398845003208603 [arcmin] (formal 1-sigma fit error)
    SNR: 25.2553312467721
 
  Angular difference between Flight and Ground position is 0.963119 arcmin
 
  Partial Coding Fraction: 0.3515625    [ including projection effects ]

  Duration
     T90: 175.784000039101 +/- 5.07888022227215
        Measured from: -85.6160000562668
                   to: 90.1679999828339     [s; relative to TRIGTIME]
     T50: 65.1840000152588 +/- 3.23786647390019
        Measured from: -1.60000002384186
                   to: 63.5839999914169     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.00400006771087646     
                   to: 0.995999932289124     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -100.284000039101     
                   to: 116.503999948502     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     6.209757   7.683213   4.805940   1.088140
           0.142394   0.147528   0.120932   0.096943 [error]
 Peak      0.184083   0.238289   0.255312   0.099537
           0.014701   0.017457   0.016612   0.011857 [error]

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

======================================================================
 
=== 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   Power-law 2.12e-06 3.25e-06 3.73e-06 8.22e-06 1.15e-05 1.73e-05   erg/cm2
              Error 1.05e-07 9.26e-08 1.29e-07 6.34e-07 3.09e-07 7.13e-07   erg/cm2
Peak flux Power-law 1.66e+00 1.94e+00 1.63e+00 2.32e+00 6.07e+00 7.56e+00   ph/cm2/s
              Error 2.22e-01 1.57e-01 1.33e-01 4.02e-01 4.34e-01 5.49e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.98e-06 3.32e-06 3.79e-06 5.38e-06 1.13e-05 1.45e-05   erg/cm2
              Error 1.35e-07 1.04e-07 1.38e-07 1.49e-06 3.62e-07 1.54e-06   erg/cm2
Peak flux Cutoff-PL 1.70e+00 1.93e+00 1.61e+00 2.31e+00 6.10e+00 7.82e+00   ph/cm2/s
              Error 2.48e-01 1.71e-01 1.51e-01 2.90e-01 6.03e-01 6.90e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.798    0.050    -      -           5.78e-03 1.53e-04   77.920 57
CPL   1.487    0.213      84.5   40.0      8.17e-03 1.93e-03   71.300 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.251    0.122    -      -           5.13e-02 3.55e-03   56.360 57
CPL   1.247    0.244    9999.4    0.0      5.16e-02 1.29e-02   56.380 56
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom

 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 115.840000 sec.
T50 in the 50-300 keV band: 54.848000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  216.788 -100.284  116.504
T90   175.784  -85.616   90.168
T50    65.184   -1.600   63.584
Peak    1.000   -0.004    0.996

Click here for the BAT GCN circular template

Special notes of this burst

Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minute to calcaulte

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  166.9628   -19.7859   0.0076    33.0407    49.1241        10.7445818     25.255 TRIG_01321323                 
 
Foreground time interval of the image:
-94.507  14.293 (delta_t = 108.800 [sec])
Background time interval of the image:

Lightcurves

Notes:

1) The mask-weighted light curves are using the flight position.
2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
5) Time of each bin is in the middle of the bin.

1 s binning

From T0-310 s to T0+310 s

From T100_start - 20 s to T100_end + 30 s

Full time interval

64 ms binning

Full time interval

From T100_start to T100_end

From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

8 ms binning

From T100_start-3 s to T100_start+3 s

2 ms binning

From T100_start-1 s to T100_start+1 s

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Quad-rate summed light curves (from T0-300s to T0+1000s)

Spectral Evolution

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 -100.284 sec. to  116.504 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.79818     ( -0.0500969   0.0502721 )
Norm@50keV  : 5.77844E-03    ( -0.000152588   0.000152443 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   77.92     using 59 bins.
 Reduced chi-squared = 1.36702
# Null hypothesis probability of 3.43e-02 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 216.8 sec: 0.795737 ( -0.023533  0.023632 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.15356e-05 ( -3.08955e-07  3.09261e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from -100.284 sec. to  116.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.48745     ( -0.218308   0.207802 )
Epeak [keV] : 84.5258      ( -15.801 64.2285 )
Norm@50keV  : 8.17179E-03    ( -0.00165344   0.00220133 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   71.30     using 59 bins.
 Reduced chi-squared = 1.27321
# Null hypothesis probability of 8.18e-02 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 216.8 sec: 0.775883 ( -0.026628  0.026764 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.12484e-05 ( -3.62591e-07  3.61289e-07 ) ergs/cm2

Band function

Time interval is from -100.284 sec. to  116.504 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 13.7306  (  )
R^2/D10^2   : 0.109873  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  355.92     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.12e-45 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.502e-07   5.008e-08
25- 50  3.466e-06   1.041e-07
50-150  4.259e-06   2.168e-07
15-150  8.675e-06   2.537e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 121.007       (-16.8958      12.8314)
Norm        : 3.25670       (-0.111971     0.17857)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   74.00     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.45e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.838e-06   1.092e-07
25- 50  3.294e-06   1.474e-07
50-150  5.902e-06   1.319e-06
15-150  1.103e-05   1.382e-06

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.41829        (-0.802315      0.848799)
R1^2/D10^2  : 0.736398        (-0.218571      0.354279)
kT2 [keV]   : 25.1724        (-2.98707      4.34125)
R2^2/D10^2  : 8.51917E-03    (-0.00384956   0.00556996)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   86.80     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.02e-03 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.696e-06   1.437e-07
25- 50  3.436e-06   1.897e-07
50-150  5.878e-06   6.135e-07
15-150  1.101e-05   7.252e-07

Peak spectrum fit

Power-law model

Time interval is from   -0.004 sec. to    0.996 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.25111     ( -0.122523   0.122081 )
Norm@50keV  : 5.13301E-02    ( -0.00355076   0.00355032 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.36     using 59 bins.
 Reduced chi-squared = 0.988772
# Null hypothesis probability of 4.99e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 6.07211 ( -0.43318  0.43406 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.13618e-07 ( -3.94634e-08  3.96429e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.004 sec. to    0.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.24700     ( -0.323464   0.164423 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 5.15632E-02    ( -0.00356581   0.0222606 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.38     using 59 bins.
 Reduced chi-squared = 1.00679
# Null hypothesis probability of 4.61e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 6.09513 ( -0.62592  0.57954 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.61024e-07 ( -3.95957e-08  1.88465e-08 ) ergs/cm2

Band function

Time interval is from   -0.004 sec. to    0.996 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 19.3786  (  )
R^2/D10^2   : 0.303445  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  116.68     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.42e-06 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.224e-08   3.240e-09
25- 50  1.084e-07   1.149e-08
50-150  3.004e-07   3.755e-08
15-150  4.310e-07   4.055e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-15.8061      -200)
Norm        : 25.1192       (-1.76764     1.76764)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   75.78     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.87e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.254e-08   4.850e-09
25- 50  1.203e-07   1.490e-08
50-150  2.638e-07   8.175e-08
15-150  4.467e-07   8.055e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.55593        (-1.42001      1.80708)
R1^2/D10^2  : 7.09480        (-3.99167      10.5832)
kT2 [keV]   : 31.0817        (-5.32504      9.34215)
R2^2/D10^2  : 5.65717E-02    (-0.0317739   0.0490848)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.92     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.03e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.389e-08   1.942e-08
25- 50  1.071e-07   2.435e-08
50-150  3.590e-07   8.445e-08
15-150  5.200e-07   1.128e-07

Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

Power-law model

 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.66665     ( -0.0680141   0.0681999 )
Norm@50keV  : 6.31420E-03    ( -0.000234704   0.000234267 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.24     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.38e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 108.8 sec: 0.829063 ( -0.0331413  0.0332435 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.37893e-06 ( -2.46882e-07  2.47376e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.50679     ( -0.280497   0.19846 )
Epeak [keV] : 158.353      ( -69.9788 -158.426 )
Norm@50keV  : 7.56292E-03    ( -0.00141666   0.00273723 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   63.19     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.37e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 108.8 sec: 0.820353 ( -0.035915  0.036001 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.30621e-06 ( -2.77995e-07  2.75732e-07 ) ergs/cm2

Band function

 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 3.25e-06
S(50-100 keV) = 3.73e-06

T90 vs. Hardness ratio plot

T90                                   = 175.784000039101 sec.
Hardness ratio (energy fluence ratio) = 1.14769

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.23728
Count Ratio (50-100 keV) / (15-25 keV) = 0.773934

Mask shadow pattern

IMX = 4.256489236012435E-01, IMY = -4.918003610058224E-01

TIME vs. PHA plot around the trigger time

TIME vs. DetID plot around the trigger time

100 us light curve (15-350 keV)

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:

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

Time interval of the image:
-94.507400 14.292600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5375 -40.5654    0.8   9.2  137.4   3.0775  14.6    0.8	Vela X-1                      
170.3154 -60.4939   12.6  38.0  122.4   0.6114   0.9    7.7	Cen X-3                       
166.9628 -19.7860    0.5  33.0   49.1  10.7456  25.2 ------	UNKNOWN                       
134.9309 -20.9889    2.4  10.9  -16.3   1.0037   4.9 ------	UNKNOWN                       
128.6678 -19.4046    2.3  12.7  -45.0   1.0472   5.1 ------	UNKNOWN                       
130.4119   1.3416    2.4  33.0  -32.2   1.1874   4.8 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
85.692600 207.169500
208.992000 251.492590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5419 -40.5679    1.2  33.9 -155.1   3.1769   9.6    1.0	Vela X-1                      
170.3601 -60.5785    2.6  40.9  157.1   2.2617   4.4    3.0	Cen X-3                       
186.7973 -62.6783    3.1  45.0  146.9   3.4852   3.8    6.7	GX 301-2                      
166.9276 -19.7879    1.6   0.1 -107.0   1.8671   7.2 ------	UNKNOWN                       
115.7801 -25.4554    3.9  47.3 -127.2   3.8048   3.0 ------	UNKNOWN

Plot creation:
Fri Jun 20 01:35:55 EDT 2025