batgrbproduct analysis for trigger=1340561

batgrbproduct Analysis for Trigger=1340561

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 03:25:01 EST 2026
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1340561
======================================================================

  Trigger: 01340561      Segment: 000

  BAT Trigger Time: 776274224   [s; MET]
      Trigger Stop: 776274288   [s; MET]
               UTC: 2025-08-07T15:43:07.895760    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 15.5855603604508   Dec: -59.0940917581662  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.22
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    9.22

  Flight Position:   [ source = BAT ]
    RA: 15.5855603604508   Dec: -59.0940917581662  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 15.6090545944497   Dec: -59.0990606145192  [deg; J2000]  
        { 01h 02m 26.2s , -59d 05' 56.6" }
         +/- 1.98230378383612 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.650835328655455 [arcmin] (formal 1-sigma fit error)
    SNR: 11.4443072408192
 
  Angular difference between Flight and Ground position is 0.782969 arcmin
 
  Partial Coding Fraction: 0.6484375    [ including projection effects ]

  Duration
     T90: 102.683999896049 +/- 29.4632802702803
        Measured from: -48.4199999570847
                   to: 54.2639999389648     [s; relative to TRIGTIME]
     T50: 53.0079998970032 +/- 4.91713902651507
        Measured from: -37.6959999799728
                   to: 15.3119999170303     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -48.5920000076294     
                   to: -47.5920000076294     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -50.9960000514984     
                   to: 84.5199999809265     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.415621   1.528654   1.104493   0.200340
           0.089213   0.092594   0.078312   0.063921 [error]
 Peak      0.023308   0.053774   0.027802   0.009272
           0.012635   0.012477   0.010817   0.008242 [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 4.30e-07 6.84e-07 8.24e-07 1.94e-06 2.49e-06 3.88e-06   erg/cm2
              Error 4.62e-08 4.54e-08 7.92e-08 3.92e-07 1.85e-07 4.59e-07   erg/cm2
Peak flux Power-law 4.17e-01 2.91e-01 1.34e-01 8.59e-02 8.84e-01 9.29e-01   ph/cm2/s
              Error 1.89e-01 1.04e-01 7.00e-02 9.17e-02 3.16e-01 3.30e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.21e-07 6.94e-07 8.28e-07 1.54e-06 2.47e-06 3.50e-06   erg/cm2
              Error 4.96e-08 5.43e-08 8.18e-08 6.23e-07 2.05e-07 6.71e-07   erg/cm2
Peak flux Cutoff-PL 2.35e-01 4.02e-01 1.78e-01 1.12e-02 8.26e-01 8.26e-01   ph/cm2/s
              Error 2.25e-01 1.47e-01 1.05e-01 3.77e-02 3.26e-01 3.27e-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    1.733    0.121    -      -           1.99e-03 1.41e-04   75.080 57
CPL   1.600    0.343     143.3  -32.3      2.34e-03 1.25e-03   74.800 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.121    0.572    -      -           5.56e-03 2.37e-03   60.580 57
CPL  -1.153    5.151      46.7   16.9      2.76e-01 1.01e+03   56.480 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: 80.768000 sec.
T50 in the 50-300 keV band: 31.936000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  135.516  -50.996   84.520
T90   102.684  -48.420   54.264
T50    53.008  -37.696   15.312
Peak    1.000  -48.592  -47.592

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
   15.6091   -59.0991   0.0168    23.6809    52.2535         2.0913793     11.444 TRIG_01340561                 
 
Foreground time interval of the image:
-17.299  72.501 (delta_t =  89.800 [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  -50.996 sec. to   84.520 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.73299     ( -0.119989   0.121951 )
Norm@50keV  : 1.99217E-03    ( -0.000141782   0.000140473 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   75.08     using 59 bins.
 Reduced chi-squared = 1.31719
# Null hypothesis probability of 5.45e-02 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 135.5 sec: 0.267718 ( -0.01792  0.017954 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.49378e-06 ( -1.84169e-07  1.85752e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -50.996 sec. to   84.520 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.59958     ( -0.461324   0.224614 )
Epeak [keV] : 143.344      ( -78.8086 -143.344 )
Norm@50keV  : 2.34066E-03    ( -0.00081486   0.00168519 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   74.80     using 59 bins.
 Reduced chi-squared = 1.33571
# Null hypothesis probability of 4.74e-02 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 135.5 sec: 0.265925 ( -0.018795  0.018782 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.46512e-06 ( -2.05484e-07  2.04188e-07 ) ergs/cm2

Band function

Time interval is from  -50.996 sec. to   84.520 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]    : 12.9621  (  )
R^2/D10^2   : 4.73123E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  143.08     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.38e-09 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.285e-07   2.771e-08
25- 50  7.844e-07   7.229e-08
50-150  8.317e-07   1.241e-07
15-150  1.845e-06   1.497e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 135.043       (-37.1198      50.2153)
Norm        : 1.09107       (-0.0870142     0.118209)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   76.45     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.38e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.827e-07   3.774e-08
25- 50  6.982e-07   7.175e-08
50-150  1.317e-06   4.520e-07
15-150  2.398e-06   5.176e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.78593        (-0.97295      1.10704)
R1^2/D10^2  : 0.637081        (-0.305131      0.686075)
kT2 [keV]   : 22.8123        (-3.51152      5.1753)
R2^2/D10^2  : 4.88122E-03    (-0.00256638   0.00429399)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   72.35     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.84e-02 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.264e-07   9.837e-08
25- 50  6.730e-07   1.278e-07
50-150  1.341e-06   3.786e-07
15-150  2.441e-06   6.119e-07

Peak spectrum fit

Power-law model

Time interval is from  -48.592 sec. to  -47.592 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.12077     ( -0.496954   0.647289 )
Norm@50keV  : 5.56155E-03    ( -0.00243307   0.00231449 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.58     using 59 bins.
 Reduced chi-squared = 1.06281
# Null hypothesis probability of 3.48e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.884230 ( -0.315349  0.31603 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.17619e-08 ( -2.01399e-08  2.06917e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  -48.592 sec. to  -47.592 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.15250     ( -7.44362   2.85843 )
Epeak [keV] : 46.7124      ( -14.6362 19.077 )
Norm@50keV  : 0.276156    ( -0.349135   2027.19 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.48     using 59 bins.
 Reduced chi-squared = 1.00857
# Null hypothesis probability of 4.57e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.826297 ( -0.323402  0.328193 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.11493e-08 ( -1.88093e-08  2.06632e-08 ) ergs/cm2

Band function

Time interval is from  -48.592 sec. to  -47.592 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]    : 12.0614  (-3.13792  3.96122)
R^2/D10^2   : 0.237528  (-0.237528   0.484095)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.39     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.98e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.311e-09   4.646e-09
25- 50  2.315e-08   1.365e-08
50-150  2.032e-08   1.492e-08
15-150  5.078e-08   3.191e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 60.5612       (-31.4524      89.3885)
Norm        : 4.87999       (-2.01917     3.03052)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.50     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.20e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.228e-08   7.795e-09
25- 50  1.875e-08   1.193e-08
50-150  2.150e-08   1.816e-08
15-150  5.253e-08   3.444e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 1.77437        (-1.7874      13.1986)
R1^2/D10^2  : 1061.17        (-945.402      -945.402)
kT2 [keV]   : 12.6712        (-3.33264      -12.6965)
R2^2/D10^2  : 0.188897    (-0.186907   0.397014)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.27     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.64e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.649e-09   4.665e-09
25- 50  2.159e-08   1.340e-08
50-150  2.153e-08   1.535e-08
15-150  5.277e-08   3.331e-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: 1.77879     ( -0.158636   0.163465 )
Norm@50keV  : 1.51177E-03    ( -0.000159676   0.000157435 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   53.68     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.00e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 89.8 sec: 0.206631 ( -0.0191461  0.0191536 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.25085e-06 ( -1.34583e-07  1.36514e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.993118     ( -0.791295   0.665428 )
Epeak [keV] : 55.9811      ( -11.9357 64.6737 )
Norm@50keV  : 4.17104E-03    ( -0.00237034   0.00741901 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.51     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.17e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 89.8 sec: 0.200935 ( -0.019703  0.019716 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16142e-06 ( -1.48673e-07  1.54294e-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)  = 6.84e-07
S(50-100 keV) = 8.24e-07

T90 vs. Hardness ratio plot

T90                                   = 102.683999896049 sec.
Hardness ratio (energy fluence ratio) = 1.20468

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.07985
Count Ratio (50-100 keV) / (15-25 keV) = 0.780218

Mask shadow pattern

IMX = 2.684805557516891E-01, IMY = -3.467912886804919E-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:
-17.299400 72.500600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
334.5285 -62.7183    2.3  43.2   44.5   2.1014   5.1 ------	UNKNOWN                       
 24.9415 -11.0896    2.3  43.0  143.8   1.8933   5.1 ------	UNKNOWN                       
 15.6091 -59.0991    1.0  23.7   52.3   2.0912  11.5 ------	UNKNOWN                       
329.8941 -83.1745    2.8  41.5   14.0   1.0605   4.1 ------	UNKNOWN                       
 17.8154 -75.8862    2.8  31.2   18.9   0.8348   4.2 ------	UNKNOWN                       
100.0310 -78.4150    2.6  35.3  -11.3   0.8022   4.5 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
132.500600 340.300640
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
186.6573 -62.7704   33.9  57.9  -24.7  -0.4962  -0.3    0.0	GX 301-2                      
296.5070 -46.9259    2.5  46.1   48.6   3.8235   4.5 ------	UNKNOWN                       
320.7858 -47.8565    2.3  33.4   65.0   2.7322   5.0 ------	UNKNOWN                       
344.4906 -69.2372    2.7  16.6   19.9   1.0526   4.2 ------	UNKNOWN                       
 59.3241 -19.6143    2.2  50.4 -142.2   4.5083   5.2 ------	UNKNOWN

Plot creation:
Sun Mar  1 23:32:58 EST 2026