batgrbproduct analysis for trigger=1328546

batgrbproduct Analysis for Trigger=1328546

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): Sun Mar  1 05:19:40 EST 2026
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1328546
======================================================================

  Trigger: 01328546      Segment: 000

  BAT Trigger Time: 772764992.576   [s; MET]
      Trigger Stop: 772764994.624   [s; MET]
               UTC: 2025-06-28T00:55:56.711100    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 38.5513336152956   Dec: -38.0807787742637  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.16
     Image Trigger?:     NO
     Rate S/N Ratio:     12.369316876853  [ if not an image trigger ]
     Image S/N Ratio:    9.16

  Flight Position:   [ source = BAT ]
    RA: 38.5513336152956   Dec: -38.0807787742637  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 38.5420269350124   Dec: -38.082520582087  [deg; J2000]  
        { 02h 34m 10.1s , -38d 04' 57.1" }
         +/- 1.58242681482206 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.648051427987611 [arcmin] (formal 1-sigma fit error)
    SNR: 15.7895710554938
 
  Angular difference between Flight and Ground position is 0.451789 arcmin
 
  Partial Coding Fraction: 0.515625    [ including projection effects ]

  Duration
     T90: 63.7839999198914 +/- 11.2791162233037
        Measured from: -7.62399995326996
                   to: 56.1599999666214     [s; relative to TRIGTIME]
     T50: 42.9679999351501 +/- 2.65221800987662
        Measured from: -0.179999947547913
                   to: 42.7879999876022     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0959999561309814     
                   to: 0.904000043869019     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -9.42400002479553     
                   to: 68.5600000619888     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.149904   1.345576   0.686592   0.102934
           0.073265   0.076295   0.063489   0.051561 [error]
 Peak      0.041488   0.053489   0.047163   0.009319
           0.009653   0.010170   0.008774   0.006043 [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 4.08e-07 5.59e-07 5.65e-07 1.04e-06 1.86e-06 2.57e-06   erg/cm2
              Error 4.08e-08 3.75e-08 6.12e-08 2.24e-07 1.43e-07 2.88e-07   erg/cm2
Peak flux Power-law 5.02e-01 4.08e-01 2.25e-01 1.82e-01 1.22e+00 1.32e+00   ph/cm2/s
              Error 1.47e-01 8.30e-02 6.37e-02 9.61e-02 2.49e-01 2.66e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.81e-07 6.02e-07 5.58e-07 3.80e-07 1.76e-06 1.92e-06   erg/cm2
              Error 4.61e-08 5.11e-08 6.93e-08 3.20e-07 1.62e-07 3.60e-07   erg/cm2
Peak flux Cutoff-PL 4.23e-01 4.59e-01 2.52e-01 7.53e-02 1.19e+00 1.21e+00   ph/cm2/s
              Error 1.76e-01 1.07e-01 7.95e-02 1.13e-01 2.53e-01 2.71e-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    1.984    0.123    -      -           2.60e-03 2.06e-04   64.520 57
CPL   1.338    0.551      44.4   14.7      5.98e-03 4.85e-03   59.730 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.862    0.329    -      -           8.61e-03 1.94e-03   57.800 57
CPL   0.794    1.525      56.3    0.0      3.06e-02 1.24e-01   55.810 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: 52.032000 sec.
T50 in the 50-300 keV band: 41.920000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   77.984   -9.424   68.560
T90    63.784   -7.624   56.160
T50    42.968   -0.180   42.788
Peak    1.000   -0.096    0.904

Click here for the BAT GCN circular template

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
   38.5420   -38.0825   0.0122    37.5651    14.6842         1.7893121     15.790 TRIG_01328546                 
 
Foreground time interval of the image:
 -9.424  28.525 (delta_t =  37.949 [sec])
Background time interval of the image:
-239.576  -9.424 (delta_t = 230.152 [sec])

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

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

8 ms binning

From T100_start-3 s to T100_start+3 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

2 ms binning

From T100_start-1 s to T100_start+1 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

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   -9.424 sec. to   68.560 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.98418     ( -0.121523   0.12523 )
Norm@50keV  : 2.59503E-03    ( -0.000207602   0.000204933 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.52     using 59 bins.
 Reduced chi-squared = 1.13193
# Null hypothesis probability of 2.30e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 77.98 sec: 0.386479 ( -0.026481  0.026507 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.86502e-06 ( -1.42064e-07  1.43443e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -9.424 sec. to   68.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.33816     ( -0.589297   0.511905 )
Epeak [keV] : 44.4086      ( -12.1265 17.2538 )
Norm@50keV  : 5.98416E-03    ( -0.00285132   0.00684271 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.73     using 59 bins.
 Reduced chi-squared = 1.06661
# Null hypothesis probability of 3.42e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 77.98 sec: 0.376457 ( -0.027593  0.027605 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.76146e-06 ( -1.60895e-07  1.63597e-07 ) ergs/cm2

Band function

Time interval is from   -9.424 sec. to   68.560 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]    : 10.2839  (-0.808138  0.882569)
R^2/D10^2   : 0.160855  (-0.043989   0.0600753)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   98.57     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.25e-04 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.726e-07   3.189e-08
25- 50  7.048e-07   5.513e-08
50-150  3.986e-07   7.428e-08
15-150  1.376e-06   1.076e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 69.9311       (-13.0802      18.0833)
Norm        : 1.89788       (-0.204622     0.233848)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.64     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.80e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.797e-07   3.665e-08
25- 50  6.039e-07   4.191e-08
50-150  7.751e-07   1.266e-07
15-150  1.759e-06   1.571e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.58203        (-1.21091      1.24886)
R1^2/D10^2  : 0.648201        (-0.284664      0.648937)
kT2 [keV]   : 21.4939        (-5.01693      9.54267)
R2^2/D10^2  : 6.09741E-03    (-0.00459452   0.00719792)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.46     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.84e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.696e-07   8.851e-08
25- 50  6.123e-07   1.321e-07
50-150  7.913e-07   3.746e-07
15-150  1.773e-06   5.340e-07

Peak spectrum fit

Power-law model

Time interval is from   -0.096 sec. to    0.904 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.86161     ( -0.311543   0.346803 )
Norm@50keV  : 8.61496E-03    ( -0.00197148   0.00191409 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.80     using 59 bins.
 Reduced chi-squared = 1.01404
# Null hypothesis probability of 4.46e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.21674 ( -0.248712  0.24905 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.92155e-08 ( -1.77714e-08  1.79495e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.096 sec. to    0.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.793695     ( -1.77644   1.27274 )
Epeak [keV] : 56.3274      ( -56.3274 -56.3274 )
Norm@50keV  : 3.06379E-02    ( -0.030638   0.217857 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.81     using 59 bins.
 Reduced chi-squared = 0.996607
# Null hypothesis probability of 4.82e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.19004 ( -0.25328  0.25212 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.74123e-08 ( -1.81703e-08  1.84196e-08 ) ergs/cm2

Band function

Time interval is from   -0.096 sec. to    0.904 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]    : 13.0502  (-2.77993  3.36301)
R^2/D10^2   : 0.227094  (-0.130408   0.315429)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.86     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.72e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.202e-09   3.072e-09
25- 50  2.837e-08   8.780e-09
50-150  3.061e-08   1.314e-08
15-150  6.718e-08   2.207e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 94.4712       (-41.5287      -94.4681)
Norm        : 5.55728       (-1.36481     1.79486)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.20     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.05e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.452e-08   3.792e-09
25- 50  2.481e-08   7.690e-09
50-150  3.890e-08   2.416e-08
15-150  7.823e-08   3.327e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.23781        (-3.38156      5.92412)
R1^2/D10^2  : 7.96701        (-7.60054      3.57515)
kT2 [keV]   : 16.5526        (-4.57214      11.8479)
R2^2/D10^2  : 8.15830E-02    (-0.0700402   0.215334)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.18     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.68e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.410e-08   7.870e-09
25- 50  2.389e-08   1.272e-08
50-150  3.856e-08   2.407e-08
15-150  7.655e-08   4.187e-08

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: 2.05794     ( -0.158719   0.166451 )
Norm@50keV  : 2.87074E-03    ( -0.000320422   0.000314642 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.82     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.09e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 37.95 sec: 0.442492 ( -0.0394277  0.0394459 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.00849e-06 ( -1.03563e-07  1.04996e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.27459     ( -0.876287   0.699888 )
Epeak [keV] : 37.8998      ( -29.7531 14.0471 )
Norm@50keV  : 8.25425E-03    ( -0.004978   0.0192915 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.10     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.09e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 37.95 sec: 0.431341 ( -0.040607  0.04062 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.38226e-07 ( -1.1722e-07  1.21334e-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)  = 5.59e-07
S(50-100 keV) = 5.65e-07

T90 vs. Hardness ratio plot

T90                                   = 63.7839999198914 sec.
Hardness ratio (energy fluence ratio) = 1.01073

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.17016
Count Ratio (50-100 keV) / (15-25 keV) = 0.597086

Mask shadow pattern

IMX = 7.440107916344209E-01, IMY = -1.949689904494813E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

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:
-239.576000 -9.424000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
357.8936  35.2481    2.4  49.1  161.8   4.5719   4.9 ------	UNKNOWN                       
  1.1096  39.9055    2.3  50.4  168.6   4.9394   5.0 ------	UNKNOWN                       
 64.2016  33.5344    3.1  44.7 -122.0   5.0020   3.7 ------	UNKNOWN                       
 63.0618  38.0265    3.3  47.3 -127.3   6.1673   3.5 ------	UNKNOWN

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

Time interval of the image:
-9.424000 28.524590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 38.5420 -38.0825    0.7  37.6   14.7   1.7894  15.8 ------	UNKNOWN                       
 15.6597  50.3241    3.5  53.4 -173.3   0.6710   3.3 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
108.724590 786.224580
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
359.5775  -4.0881    2.1  49.1  161.8  12.7493   5.5  246.6	UNKNOWN                       
 25.9377 -57.2600    3.1  20.9   57.2   3.3951   3.7 ------	UNKNOWN                       
  2.8322   0.1353    2.3  50.4  168.6  12.6510   5.0  170.1	UNKNOWN                       
 70.6544 -66.8447    2.9  34.0   15.9   4.3794   4.0 ------	UNKNOWN                       
125.1321 -57.6872    2.5  56.9   -1.7  10.6510   4.6 ------	UNKNOWN                       
 71.3944 -18.8315    2.1  34.4  -76.9   7.8373   5.6 ------	UNKNOWN

Plot creation:
Sun Mar  1 23:37:26 EST 2026