batgrbproduct analysis for trigger=1351039

batgrbproduct Analysis for Trigger=1351039

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): Sat Feb 28 23:10:59 EST 2026
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1351039
======================================================================

  Trigger: 01351039      Segment: 000

  BAT Trigger Time: 780074753.792   [s; MET]
      Trigger Stop: 780074754.816   [s; MET]
               UTC: 2025-09-20T15:25:17.429200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 51.4589467862716   Dec: -29.6457820402814  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    17.27
     Image Trigger?:     NO
     Rate S/N Ratio:     89.0673902166219  [ if not an image trigger ]
     Image S/N Ratio:    17.27

  Flight Position:   [ source = BAT ]
    RA: 51.4589467862716   Dec: -29.6457820402814  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 51.4648943632896   Dec: -29.6467624060029  [deg; J2000]  
        { 03h 25m 51.6s , -29d 38' 48.3" }
         +/- 1.11772268789511 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.386513592787829 [arcmin] (formal 1-sigma fit error)
    SNR: 25.9459581710133
 
  Angular difference between Flight and Ground position is 0.315670 arcmin
 
  Partial Coding Fraction: 0.1582031    [ including projection effects ]

  Duration
     T90: 37.9959999322891 +/- 1.25301558717621
        Measured from: 0.171999931335449
                   to: 38.1679998636246     [s; relative to TRIGTIME]
     T50: 29.2919999361038 +/- 0.637695861456503
        Measured from: 3.37199997901917
                   to: 32.663999915123     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.116000056266785     
                   to: 0.883999943733215     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.440000057220459     
                   to: 40.4919999837875     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     4.100579   7.092602   6.035597   1.875805
           0.124453   0.142126   0.129196   0.097923 [error]
 Peak      0.265841   0.757110   0.754245   0.241270
           0.028081   0.038590   0.038021   0.025144 [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 1.74e-06 3.27e-06 4.75e-06 1.46e-05 1.35e-05 2.44e-05   erg/cm2
              Error 8.62e-08 9.64e-08 1.33e-07 9.23e-07 3.38e-07 9.88e-07   erg/cm2
Peak flux Power-law 9.26e-04 9.47e-03 1.27e-01 1.10e+01 4.62e-01 8.42e+00   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
Fluence   Cutoff-PL 1.58e-06 3.34e-06 4.95e-06 9.50e-06 1.33e-05 1.94e-05   erg/cm2
              Error 1.11e-07 1.04e-07 1.62e-07 1.90e-06 3.55e-07 1.90e-06   erg/cm2
Peak flux Cutoff-PL 3.22e+00 5.72e+00 5.62e+00 3.35e+00 1.67e+01 1.79e+01   ph/cm2/s
              Error 5.19e-01 4.21e-01 4.02e-01 9.41e-01 9.90e-01 1.31e+00   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    1.465    0.044    -      -           3.45e-02 8.47e-04   58.710 57
CPL   1.092    0.183     140.0   51.1      5.04e-02 9.28e-03   45.720 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.129    0.085    -      -           1.46e-01 8.20e-03   78.020 57
CPL   0.016    0.425     102.0   20.6      4.67e-01 2.11e-01   52.840 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: 36.672000 sec.
T50 in the 50-300 keV band: 29.504000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   40.932   -0.440   40.492
T90    37.996    0.172   38.168
T50    29.292    3.372   32.664
Peak    1.000   -0.116    0.884

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
   51.4649   -29.6468   0.0074    47.6007   155.6294         5.9696474     25.946 TRIG_01351039                 
 
Foreground time interval of the image:
 -0.440  14.709 (delta_t =  15.149 [sec])
Background time interval of the image:
-239.792  -0.440 (delta_t = 239.352 [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 1.024000

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 1.024000

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 1.024000

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   -0.440 sec. to   40.492 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.46454     ( -0.0435359   0.0434769 )
Norm@50keV  : 3.44779E-02    ( -0.000847191   0.000847017 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.71     using 59 bins.
 Reduced chi-squared = 1.03
# Null hypothesis probability of 4.12e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 40.93 sec: 4.26456 ( -0.1186  0.11894 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.34701e-05 ( -3.37514e-07  3.37886e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.440 sec. to   40.492 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.09159     ( -0.186941   0.179777 )
Epeak [keV] : 140.023      ( -28.2787 73.9286 )
Norm@50keV  : 5.04395E-02    ( -0.00826174   0.010291 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   45.72     using 59 bins.
 Reduced chi-squared = 0.816429
# Null hypothesis probability of 8.35e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 40.93 sec: 4.16180 ( -0.12663  0.12724 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.32596e-05 ( -3.55125e-07  3.54546e-07 ) ergs/cm2

Band function

Time interval is from   -0.440 sec. to   40.492 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]    : 17.7787  (  )
R^2/D10^2   : 0.267942  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  356.79     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.64e-45 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.968e-07   3.663e-08
25- 50  3.192e-06   1.181e-07
50-150  7.301e-06   2.865e-07
15-150  1.119e-05   3.131e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-5.13919      -200)
Norm        : 17.8193       (-0.436551     0.436551)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   70.54     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.07e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.817e-06   4.727e-08
25- 50  3.495e-06   1.001e-07
50-150  7.665e-06   2.087e-07
15-150  1.298e-05   3.766e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.90276        (-0.819878      0.855546)
R1^2/D10^2  : 1.85439        (-0.450492      0.65699)
kT2 [keV]   : 31.6199        (-3.13075      4.26325)
R2^2/D10^2  : 2.76827E-02    (-0.00996493   0.0129812)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.33     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.59e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.336e-06   1.140e-07
25- 50  3.514e-06   1.557e-07
50-150  8.358e-06   6.774e-07
15-150  1.321e-05   8.391e-07

Peak spectrum fit

Power-law model

Time interval is from   -0.116 sec. to    0.884 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.12868     ( -0.0853469   0.0846204 )
Norm@50keV  : 0.145557    ( -0.00820133   0.00819495 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   78.02     using 59 bins.
 Reduced chi-squared = 1.36877
# Null hypothesis probability of 3.37e-02 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.461853 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.50838e-06 ( -8.88323e-08  8.89697e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.116 sec. to    0.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.59018E-02     ( -0.444355   0.404823 )
Epeak [keV] : 101.984      ( -14.5121 26.7233 )
Norm@50keV  : 0.467106    ( -0.157759   0.264567 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.84     using 59 bins.
 Reduced chi-squared = 0.943571
# Null hypothesis probability of 5.95e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 16.6533 ( -0.9891  0.9906 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.48255e-06 ( -9.28214e-08  9.25568e-08 ) ergs/cm2

Band function

Time interval is from   -0.116 sec. to    0.884 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]    : 19.9150  (-1.21943  1.32815)
R^2/D10^2   : 0.873998  (-0.170881   0.206484)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   76.92     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.05e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.693e-08   7.170e-09
25- 50  3.325e-07   2.770e-08
50-150  9.769e-07   8.265e-08
15-150  1.376e-06   9.250e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 70.5504       (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  136.85     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.62e-08 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.757e-07   1.015e-08
25- 50  3.379e-07   2.165e-08
50-150  7.412e-07   6.330e-08
15-150  1.255e-06   8.650e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 12.0475        (-2.96987      1.62937)
R1^2/D10^2  : 2.53202        (-0.952109      2.10218)
kT2 [keV]   : 34.2154        (-8.4348      35.0543)
R2^2/D10^2  : 9.69231E-02    (-0.084098   0.191035)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.53     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.83e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.407e-08   2.911e-08
25- 50  3.517e-07   9.610e-08
50-150  1.037e-06   3.913e-07
15-150  1.482e-06   5.413e-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: 1.38010     ( -0.0720534   0.0717555 )
Norm@50keV  : 2.87155E-02    ( -0.00127434   0.00127424 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   76.24     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.52e-02 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 15.15 sec: 3.48156 ( -0.165747  0.166078 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.22111e-06 ( -1.95515e-07  1.9572e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.558510     ( -0.350095   0.325014 )
Epeak [keV] : 96.0969      ( -13.9808 27.8978 )
Norm@50keV  : 6.97322E-02    ( -0.020201   0.030991 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.68     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.87e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 15.15 sec: 3.37769 ( -0.16966  0.17011 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.09658e-06 ( -2.06676e-07  2.05252e-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)  = 3.27e-06
S(50-100 keV) = 4.75e-06

T90 vs. Hardness ratio plot

T90                                   = 37.9959999322891 sec.
Hardness ratio (energy fluence ratio) = 1.4526

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.72966
Count Ratio (50-100 keV) / (15-25 keV) = 1.47189

Mask shadow pattern

IMX = -9.975812143972496E-01, IMY = -4.519055188255474E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

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:
-239.792000 -0.440000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
264.6922 -44.5400    4.4  52.9  -13.3   2.2768   2.6    5.8	4U 1735-44                    
350.5143 -41.3205    2.9  33.3   77.0   3.1110   3.9 ------	UNKNOWN                       
351.1754 -42.3889    3.0  32.2   77.5   2.7611   3.8 ------	UNKNOWN                       
 46.1501 -75.6693    3.4   9.3 -128.0   1.1360   3.4 ------	UNKNOWN

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

Time interval of the image:
-0.440000 14.708570
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
264.8756 -44.4067    5.7  53.0  -13.0   0.2917   2.0    6.2	4U 1735-44                    
 51.4649 -29.6467    0.4  47.6  155.6   5.9688  25.9 ------	UNKNOWN                       
 32.8150 -44.4948    3.0  29.7  137.7   0.3455   3.8 ------	UNKNOWN                       
228.6682 -54.3741    2.2  50.5  -45.2   1.2559   5.2 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
109.308590 195.908600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 63.0248   0.0539    2.7  31.7 -176.7   0.7432   4.2 ------	UNKNOWN                       
 76.8838 -20.4760    2.7  24.7 -125.1   0.6870   4.2 ------	UNKNOWN                       
113.8347 -73.9307    2.5  54.1  -36.8   3.9588   4.7 ------	UNKNOWN                       
 98.1675 -28.9834    2.2  40.5  -98.1   3.3151   5.3 ------	UNKNOWN

Plot creation:
Sun Mar  1 23:23:54 EST 2026