batgrbproduct analysis for trigger=1404904

batgrbproduct Analysis for Trigger=1404904

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 20:06:59 EST 2026
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1404904
======================================================================

  Trigger: 01404904      Segment: 000

  BAT Trigger Time: 782383281.152   [s; MET]
      Trigger Stop: 782383282.176   [s; MET]
               UTC: 2025-10-17T08:40:44.632520    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 335.386417470042   Dec: 7.05068725437213  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.52
     Image Trigger?:     NO
     Rate S/N Ratio:     15.7162336455017  [ if not an image trigger ]
     Image S/N Ratio:    9.52

  Flight Position:   [ source = BAT ]
    RA: 335.386417470042   Dec: 7.05068725437213  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 335.400351731674   Dec: 7.04389762381418  [deg; J2000]  
        { 22h 21m 36.1s , +07d 02' 38.0" }
         +/- 1.19380821236832 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.416217948022717 [arcmin] (formal 1-sigma fit error)
    SNR: 23.6163003039039
 
  Angular difference between Flight and Ground position is 0.924351 arcmin
 
  Partial Coding Fraction: 0.9375    [ including projection effects ]

  Duration
     T90: 118 +/- 58.0813447658905
        Measured from: -3.27999997138977
                   to: 114.72000002861     [s; relative to TRIGTIME]
     T50: 17.6319999694824 +/- 9.73821835748281
        Measured from: 2.04800009727478
                   to: 19.6800000667572     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 6.42000007629395     
                   to: 7.42000007629395     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -8.09599995613098     
                   to: 125.488000035286     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.480025   0.754212   0.528685   0.167996
           0.066210   0.069147   0.058443   0.049059 [error]
 Peak      0.035191   0.063743   0.050652   0.011158
           0.006326   0.007114   0.006329   0.004720 [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 1.46e-07 2.86e-07 4.38e-07 1.46e-06 1.23e-06 2.32e-06   erg/cm2
              Error 2.81e-08 3.20e-08 5.84e-08 4.44e-07 1.42e-07 4.81e-07   erg/cm2
Peak flux Power-law 3.42e-01 4.11e-01 3.56e-01 5.27e-01 1.29e+00 1.64e+00   ph/cm2/s
              Error 7.54e-02 5.68e-02 4.91e-02 1.49e-01 1.59e-01 2.08e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.46e-07 2.79e-07 4.28e-07 1.68e-06 1.23e-06 2.27e-06   erg/cm2
              Error 2.81e-08 3.20e-08 5.84e-08 -------- 1.37e-07 5.07e-07   erg/cm2
Peak flux Cutoff-PL 3.11e-01 4.31e-01 3.76e-01 3.07e-01 1.28e+00 1.43e+00   ph/cm2/s
              Error 8.72e-02 6.68e-02 5.81e-02 2.23e-01 1.62e-01 2.88e-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    1.388    0.194    -      -           9.47e-04 9.71e-05   59.440 57
CPL   1.385    0.195    10000.0    0.0      9.50e-04 9.71e-05   59.480 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.206    0.197    -      -           1.10e-02 1.32e-03   57.710 57
CPL   0.700    0.738     134.3  -38.9      1.96e-02 2.01e-02   56.340 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: 153.152000 sec.
T50 in the 50-300 keV band: 68.928000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  133.584   -8.096  125.488
T90   118.000   -3.280  114.720
T50    17.632    2.048   19.680
Peak    1.000    6.420    7.420

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
  335.4004     7.0439   0.0081    21.0832    -0.8552         1.3754527     23.616 TRIG_01404904                 
 
Foreground time interval of the image:
 -8.096  15.949 (delta_t =  24.045 [sec])
Background time interval of the image:
-194.651  -8.096 (delta_t = 186.555 [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   -8.096 sec. to  125.488 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.38761     ( -0.194715   0.192674 )
Norm@50keV  : 9.47033E-04    ( -9.72844e-05   9.69726e-05 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.44     using 59 bins.
 Reduced chi-squared = 1.04281
# Null hypothesis probability of 3.87e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 133.6 sec: 0.115013 ( -0.012056  0.012083 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.22585e-06 ( -1.41156e-07  1.42311e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -8.096 sec. to  125.488 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.38524     ( -0.211711   0.179202 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 9.50391E-04    ( -9.78333e-05   9.63403e-05 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.48     using 59 bins.
 Reduced chi-squared = 1.06214
# Null hypothesis probability of 3.50e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 133.6 sec: 0.115002 ( -0.012068  0.012074 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.23361e-06 ( -1.39583e-07  1.33891e-07 ) ergs/cm2

Band function

Time interval is from   -8.096 sec. to  125.488 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]    : 15.6800  (-3.04873  4.4926)
R^2/D10^2   : 1.06435E-02  (-0.00593887   0.0119287)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  108.40     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.79e-05 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.260e-08   1.679e-08
25- 50  3.002e-07   5.184e-08
50-150  5.118e-07   1.070e-07
15-150  8.846e-07   1.353e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-43.1115      -200)
Norm        : 0.472422       (-0.0484101     0.0484101)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   65.02     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.18e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.572e-07   6.498e-08
25- 50  3.024e-07   1.631e-07
50-150  6.631e-07   3.582e-07
15-150  1.123e-06   6.108e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.54959        (-1.35289      1.549)
R1^2/D10^2  : 0.111992        (-0.0547662      0.117232)
kT2 [keV]   : 58.0352        (-21.6281      129.878)
R2^2/D10^2  : 1.84714E-04    (-0.000161119   0.000419056)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   50.80     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.36e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.553e-07   4.587e-08
25- 50  2.925e-07   9.139e-08
50-150  8.904e-07   4.518e-07
15-150  1.338e-06   5.021e-07

Peak spectrum fit

Power-law model

Time interval is from    6.420 sec. to    7.420 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.20623     ( -0.198785   0.194974 )
Norm@50keV  : 1.10198E-02    ( -0.00132486   0.00132482 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.71     using 59 bins.
 Reduced chi-squared = 1.01246
# Null hypothesis probability of 4.49e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.29465 ( -0.15932  0.15955 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.11617e-07 ( -1.47446e-08  1.4845e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    6.420 sec. to    7.420 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.699519     ( -0.875317   0.599991 )
Epeak [keV] : 134.311      ( -56.5107 -134.311 )
Norm@50keV  : 1.95867E-02    ( -0.00859104   0.0316877 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.34     using 59 bins.
 Reduced chi-squared = 1.00607
# Null hypothesis probability of 4.62e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.27682 ( -0.16194  0.16185 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.08328e-07 ( -1.59497e-08  1.57486e-08 ) ergs/cm2

Band function

Time interval is from    6.420 sec. to    7.420 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]    : 17.7284  (-2.73056  3.39283)
R^2/D10^2   : 8.97345E-02  (-0.0396254   0.0678747)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   68.58     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.40e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.674e-09   1.457e-09
25- 50  2.594e-08   4.610e-09
50-150  5.894e-08   1.316e-08
15-150  9.056e-08   1.694e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-35.9736      -200)
Norm        : 5.34859       (-0.655458     0.655458)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.70     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.26e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.332e-08   7.440e-09
25- 50  2.562e-08   1.430e-08
50-150  5.618e-08   3.131e-08
15-150  9.511e-08   5.225e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 9.57219        (-3.00863      3.6477)
R1^2/D10^2  : 0.451032        (-0.269014      0.528695)
kT2 [keV]   : 37.0232        (-13.3352      148.282)
R2^2/D10^2  : 6.03948E-03    (-0.00590121   0.0223073)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   54.32     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.01e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.408e-09   5.275e-09
25- 50  2.684e-08   1.445e-08
50-150  7.393e-08   4.111e-08
15-150  1.102e-07   5.715e-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: 1.28851     ( -0.117251   0.11601 )
Norm@50keV  : 3.79323E-03    ( -0.000250174   0.000250156 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   66.84     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.75e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 24.04 sec: 0.451599 ( -0.0309869  0.0310349 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.03668e-07 ( -6.55078e-08  6.58011e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.23371     ( -0.443735   0.161121 )
Epeak [keV] : 736.271      ( -736.299 -736.299 )
Norm@50keV  : 4.03418E-03    ( -0.000459014   0.00250166 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   66.79     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.53e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 24.04 sec: 0.450519 ( -0.031938  0.031692 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.0075e-07 ( -7.07473e-08  6.8151e-08 ) 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)  = 2.86e-07
S(50-100 keV) = 4.38e-07

T90 vs. Hardness ratio plot

T90                                   = 118 sec.
Hardness ratio (energy fluence ratio) = 1.53147

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.57119
Count Ratio (50-100 keV) / (15-25 keV) = 1.10137

Mask shadow pattern

IMX = 3.854884955338382E-01, IMY = 5.754277054750405E-03

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:
-194.651400 -8.096000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.0495  38.2624    4.5  51.7   18.5   1.8690   2.5    6.8	Cyg X-2                       
 36.4956 -29.9787    2.3  48.7  165.1   3.7759   5.0 ------	UNKNOWN                       
 29.3082 -48.4664    3.6  52.0 -170.1   2.4263   3.2 ------	UNKNOWN                       
 30.5484 -54.4225    2.8  56.3 -164.9   3.6422   4.1 ------	UNKNOWN                       
331.1285 -26.9318    2.7  25.5  -96.4   1.3322   4.2 ------	UNKNOWN

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

Time interval of the image:
-8.096000 15.948600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
325.9349  38.3168   65.7  51.8   18.5  -0.0457  -0.2   11.2	Cyg X-2                       
324.2375  28.7032    2.1  44.6    9.7   0.6336   5.6 ------	UNKNOWN                       
 25.4472 -36.2527    1.9  42.7  178.3   0.5673   6.0 ------	UNKNOWN                       
335.4004   7.0440    0.5  21.1   -0.9   1.3763  23.6 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
95.748600 962.903700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5756  35.2136    0.7  43.2  -37.8  35.5854  17.3    1.0	Cyg X-1                       
308.0597  40.9285    3.9  41.7  -24.9   5.7888   3.0    2.7	Cyg X-3                       
326.0495  38.2885    5.7  32.3   -7.3   2.4687   2.1    6.1	Cyg X-2                       
355.6587 -37.7789    2.1  48.7  165.1  16.4734   5.4 ------	UNKNOWN                       
337.5388  60.8778    3.2  53.8    7.8  10.5051   3.6 ------	UNKNOWN

Plot creation:
Sun Mar  1 23:16:29 EST 2026