batgrbproduct analysis for trigger=1409824

batgrbproduct Analysis for Trigger=1409824

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 19:18:48 EST 2026
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1409824
======================================================================

  Trigger: 01409824      Segment: 000

  BAT Trigger Time: 783881232.96   [s; MET]
      Trigger Stop: 783881233.472   [s; MET]
               UTC: 2025-11-03T16:46:36.338960    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 105.863587756866   Dec: -24.8433150687881  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.84
     Image Trigger?:     NO
     Rate S/N Ratio:     30.935416596516  [ if not an image trigger ]
     Image S/N Ratio:    11.84

  Flight Position:   [ source = BAT ]
    RA: 105.863587756866   Dec: -24.8433150687881  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 105.869584541645   Dec: -24.8707957628099  [deg; J2000]  
        { 07h 03m 28.7s , -24d 52' 14.9" }
         +/- 1.03007936750309 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.314148878488829 [arcmin] (formal 1-sigma fit error)
    SNR: 29.156251136988
 
  Angular difference between Flight and Ground position is 1.680852 arcmin
 
  Partial Coding Fraction: 0.9921875    [ including projection effects ]

  Duration
     T90: 127.860000014305 +/- 22.4101913152097
        Measured from: -43.2720000743866
                   to: 84.5879999399185     [s; relative to TRIGTIME]
     T50: 21.5919998884201 +/- 4.63961253360151
        Measured from: 0.53600001335144
                   to: 22.1279999017715     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.00399994850159     
                   to: 3.00399994850159     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -52.0720000267029     
                   to: 92.7439999580383     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.057077   2.442229   1.407337   0.321077
           0.074173   0.076891   0.062790   0.049874 [error]
 Peak      0.090980   0.124846   0.132324   0.032670
           0.007725   0.008767   0.007768   0.005636 [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 6.28e-07 9.66e-07 1.11e-06 2.48e-06 3.45e-06 5.18e-06   erg/cm2
              Error 4.37e-08 3.95e-08 6.35e-08 3.04e-07 1.47e-07 3.52e-07   erg/cm2
Peak flux Power-law 7.60e-01 9.24e-01 8.14e-01 1.23e+00 2.93e+00 3.73e+00   ph/cm2/s
              Error 9.88e-02 7.28e-02 6.15e-02 1.99e-01 2.00e-01 2.61e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.08e-07 9.82e-07 1.12e-06 1.84e-06 3.39e-06 4.55e-06   erg/cm2
              Error 5.31e-08 4.69e-08 6.59e-08 6.88e-07 1.72e-07 7.25e-07   erg/cm2
Peak flux Cutoff-PL 7.51e-01 9.28e-01 8.20e-01 1.26e+00 2.92e+00 3.66e+00   ph/cm2/s
              Error 1.06e-01 7.77e-02 7.06e-02 3.25e-01 2.01e-01 3.98e-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    1.792    0.076    -      -           2.58e-03 1.08e-04   82.170 57
CPL   1.604    0.277     102.2  -32.8      3.22e-03 1.05e-03   80.980 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.183    0.116    -      -           2.50e-02 1.65e-03   48.180 57
CPL   1.092    0.284     513.9    0.0      2.76e-02 9.36e-03   48.200 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: 47.296000 sec.
T50 in the 50-300 keV band: 15.488000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  144.816  -52.072   92.744
T90   127.860  -43.272   84.588
T50    21.592    0.536   22.128
Peak    1.000    2.004    3.004

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
  105.8696   -24.8708   0.0065    16.2839   167.5393         3.2402810     29.156 TRIG_01409824                 
 
Foreground time interval of the image:
-52.072  11.341 (delta_t =  63.413 [sec])
Background time interval of the image:
-239.960 -52.072 (delta_t = 187.888 [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

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  -52.072 sec. to   92.744 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.79246     ( -0.0756665   0.0763794 )
Norm@50keV  : 2.57928E-03    ( -0.000107995   0.000107524 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   82.17     using 59 bins.
 Reduced chi-squared = 1.44158
# Null hypothesis probability of 1.62e-02 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 144.8 sec: 0.354405 ( -0.014863  0.014903 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.43977e-06 ( -1.47095e-07  1.47705e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -52.072 sec. to   92.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.60407     ( -0.311854   0.242949 )
Epeak [keV] : 102.248      ( -36.644 -102.249 )
Norm@50keV  : 3.21801E-03    ( -0.000716765   0.00138771 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   80.98     using 59 bins.
 Reduced chi-squared = 1.44607
# Null hypothesis probability of 1.62e-02 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 144.8 sec: 0.349922 ( -0.01633  0.016363 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.38173e-06 ( -1.72371e-07  1.71869e-07 ) ergs/cm2

Band function

Time interval is from  -52.072 sec. to   92.744 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]    : 12.7376  (  )
R^2/D10^2   : 6.51413E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  228.11     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.50e-22 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.246e-07   2.469e-08
25- 50  1.093e-06   5.408e-08
50-150  1.108e-06   9.839e-08
15-150  2.526e-06   1.093e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 113.278       (-18.2846      21.4775)
Norm        : 1.49376       (-0.0827701     0.099494)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   83.66     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.23e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.645e-07   4.243e-08
25- 50  9.996e-07   5.372e-08
50-150  1.733e-06   4.428e-07
15-150  3.297e-06   4.576e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.79150        (-0.867978      0.917604)
R1^2/D10^2  : 0.467654        (-0.164135      0.29646)
kT2 [keV]   : 24.4157        (-3.42757      5.09895)
R2^2/D10^2  : 4.44101E-03    (-0.00222629   0.00354425)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   85.32     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.46e-03 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.532e-07   7.544e-08
25- 50  1.005e-06   1.090e-07
50-150  1.768e-06   3.188e-07
15-150  3.326e-06   3.815e-07

Peak spectrum fit

Power-law model

Time interval is from    2.004 sec. to    3.004 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.18295     ( -0.116093   0.11492 )
Norm@50keV  : 2.50093E-02    ( -0.00165182   0.00165155 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.18     using 59 bins.
 Reduced chi-squared = 0.845263
# Null hypothesis probability of 7.91e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.92874 ( -0.19997  0.20028 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.54994e-07 ( -1.85382e-08  1.86211e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    2.004 sec. to    3.004 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.09209     ( -0.455808   0.112755 )
Epeak [keV] : 513.875      ( -865.628 -865.628 )
Norm@50keV  : 2.75673E-02    ( -0.00290572   0.0158088 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.20     using 59 bins.
 Reduced chi-squared = 0.860714
# Null hypothesis probability of 7.61e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.92281 ( -0.20498  0.19709 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.54314e-07 ( -1.93453e-08  1.72799e-08 ) ergs/cm2

Band function

Time interval is from    2.004 sec. to    3.004 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]    : 20.1022  (-1.76069  1.98505)
R^2/D10^2   : 0.133148  (-0.0353404   0.0469633)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   99.95     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.80e-04 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.035e-08   1.442e-09
25- 50  5.173e-08   5.145e-09
50-150  1.551e-07   1.880e-08
15-150  2.172e-07   1.890e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-12.5897      -200)
Norm        : 12.1188       (-0.81948     0.81948)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   77.32     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.79e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.017e-08   2.395e-09
25- 50  5.804e-08   6.045e-09
50-150  1.273e-07   2.914e-08
15-150  2.155e-07   3.835e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.25268        (-1.31164      1.78688)
R1^2/D10^2  : 3.60030        (-2.07879      5.21872)
kT2 [keV]   : 29.0211        (-4.19754      6.83179)
R2^2/D10^2  : 3.56766E-02    (-0.0176839   0.0197789)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.14     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.65e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.459e-08   9.838e-09
25- 50  5.075e-08   1.049e-08
50-150  1.781e-07   3.650e-08
15-150  2.534e-07   4.925e-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: 1.66231     ( -0.0901635   0.0908894 )
Norm@50keV  : 3.27643E-03    ( -0.000161787   0.000161143 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.76     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.42e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 63.41 sec: 0.429573 ( -0.0214646  0.0215375 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.92991e-06 ( -1.0079e-07  1.01252e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.66390     ( -0.0928526   0.0894214 )
Epeak [keV] : 9999.36      ( -9999.35 -9999.36 )
Norm@50keV  : 3.27715E-03    ( -0.00120817   0.00124885 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.77     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.08e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 63.41 sec: 0.429583 ( -0.021459  0.021327 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.92285e-06 ( -1.02743e-07  1.10695e-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)  = 9.66e-07
S(50-100 keV) = 1.11e-06

T90 vs. Hardness ratio plot

T90                                   = 127.860000014305 sec.
Hardness ratio (energy fluence ratio) = 1.14907

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.18723
Count Ratio (50-100 keV) / (15-25 keV) = 0.684144

Mask shadow pattern

IMX = -2.852350091827213E-01, IMY = -6.303008692623259E-02

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:
-239.960000 -52.072000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5396 -40.5477    1.8  24.5 -101.9   1.9738   6.3    0.7	Vela X-1                      
170.2414 -60.7953   13.2  44.4  -61.8   1.1654   0.9   10.6	Cen X-3                       
 68.8408 -26.5170    2.6  31.6   84.7   2.3755   4.5 ------	UNKNOWN                       
 49.6612 -47.3030    2.7  38.0   40.3   2.4216   4.3 ------	UNKNOWN                       
 84.2652 -33.0696    2.6  16.9   90.2   1.4776   4.5 ------	UNKNOWN                       
100.6564 -72.7150    2.9  31.8  -20.4   1.1885   4.0 ------	UNKNOWN

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

Time interval of the image:
-52.072000 11.340590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.3577 -40.5369    4.2  24.4 -102.0   0.3858   2.7    7.9	Vela X-1                      
170.4491 -60.7230    6.4  44.5  -61.9  -0.8327  -1.8    7.2	Cen X-3                       
 77.1591  -5.9784    2.8  41.9  117.8   1.7165   4.1 ------	UNKNOWN                       
105.8696 -24.8708    0.4  16.3  167.5   3.2402  29.1 ------	UNKNOWN                       
121.4291   8.4749    2.1  52.3 -178.5   1.7906   5.5 ------	UNKNOWN                       
143.8817  -2.6690    2.6  53.1 -146.9   1.8276   4.4 ------	UNKNOWN                       
151.0575 -17.4223    2.1  47.3 -126.9   2.7486   5.5 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
61.140590 962.109500
1082.040000 1282.090000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5473 -40.5031    1.6  29.3  -74.4  13.1705   7.2    3.2	Vela X-1                      
104.0566 -35.5304    3.4  10.8  -16.1   4.6443   3.4 ------	UNKNOWN

Plot creation:
Sun Mar  1 23:14:20 EST 2026