batgrbproduct analysis for trigger=1442454

batgrbproduct Analysis for Trigger=1442454

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 16:45:22 EST 2026
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1442454
======================================================================

  Trigger: 01442454      Segment: 000

  BAT Trigger Time: 790624863.232   [s; MET]
      Trigger Stop: 790624865.28   [s; MET]
               UTC: 2026-01-20T18:00:26.154800    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 284.66555499343   Dec: 61.9118595655486  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.73
     Image Trigger?:     NO
     Rate S/N Ratio:     32.6190128606002  [ if not an image trigger ]
     Image S/N Ratio:    7.73

  Flight Position:   [ source = BAT ]
    RA: 284.66555499343   Dec: 61.9118595655486  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 284.700516916953   Dec: 61.9041098222394  [deg; J2000]  
        { 18h 58m 48.1s , +61d 54' 14.8" }
         +/- 1.98707555481336 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.796405349989952 [arcmin] (formal 1-sigma fit error)
    SNR: 11.4050668759122
 
  Angular difference between Flight and Ground position is 1.091761 arcmin
 
  Partial Coding Fraction: 0.09472656    [ including projection effects ]

  Duration
     T90: 4.46399998664856 +/- 0.915921384311323
        Measured from: -0.159999966621399
                   to: 4.30400002002716     [s; relative to TRIGTIME]
     T50: 2.14400005340576 +/- 0.446927350005418
        Measured from: 0.832000017166138
                   to: 2.9760000705719     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.516000032424927     
                   to: 1.51600003242493     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.351999998092651     
                   to: 4.65600001811981     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.100149   0.433188   0.680383   0.233392
           0.064495   0.065079   0.062156   0.046367 [error]
 Peak     -0.006147   0.113604   0.260124   0.066316
           0.029913   0.030724   0.033764   0.023120 [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 8.46e-08 2.17e-07 4.46e-07 2.32e-06 1.20e-06 3.07e-06   erg/cm2
              Error 2.43e-08 3.89e-08 5.39e-08 6.00e-07 1.45e-07 6.08e-07   erg/cm2
Peak flux Power-law 8.46e-01 1.02e+00 8.86e-01 1.32e+00 3.22e+00 4.07e+00   ph/cm2/s
              Error 3.60e-01 3.02e-01 1.99e-01 4.64e-01 8.39e-01 9.21e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.17e-08 2.13e-07 5.56e-07 6.36e-07 1.18e-06 1.44e-06   erg/cm2
              Error 2.68e-08 4.73e-08 8.22e-08 4.43e-07 1.51e-07 4.46e-07   erg/cm2
Peak flux Cutoff-PL 1.07e-01 8.14e-01 1.70e+00 5.02e-01 3.06e+00 3.12e+00   ph/cm2/s
              Error 1.86e-01 6.25e-01 3.78e-01 2.39e-01 7.04e-01 7.36e-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    0.962    0.206    -      -           2.19e-02 3.06e-03   57.980 57
CPL  -0.981    1.382     102.1   36.3      1.15e-01 1.72e-01   48.890 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.204    0.288    -      -           2.74e-02 6.67e-03   78.700 57
CPL  -3.796    3.117      84.0   10.6      1.34e+00 6.87e+00   57.310 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: 3.200000 sec.
T50 in the 50-300 keV band: 1.728000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    5.008   -0.352    4.656
T90     4.464   -0.160    4.304
T50     2.144    0.832    2.976
Peak    1.000    0.516    1.516

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
  284.7005    61.9041   0.0169    55.7959  -177.9100         1.5690446     11.405 TRIG_01442454                 
 
Foreground time interval of the image:
 -0.352   4.656 (delta_t =   5.008 [sec])
Background time interval of the image:
-239.232  -0.352 (delta_t = 238.880 [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   -0.352 sec. to    4.656 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.961923     ( -0.212188   0.200204 )
Norm@50keV  : 2.19009E-02    ( -0.00308999   0.00303231 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.98     using 59 bins.
 Reduced chi-squared = 1.01719
# Null hypothesis probability of 4.39e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 5.008 sec: 2.51713 ( -0.35727  0.36437 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.20255e-06 ( -1.45017e-07  1.45028e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.352 sec. to    4.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.981287     ( -1.58065   1.18292 )
Epeak [keV] : 102.128      ( -18.1695 54.3616 )
Norm@50keV  : 0.114518    ( -0.0711622   0.272205 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.89     using 59 bins.
 Reduced chi-squared = 0.873036
# Null hypothesis probability of 7.38e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 5.008 sec: 2.30885 ( -0.35025  0.36829 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.1768e-06 ( -1.51402e-07  1.49839e-07 ) ergs/cm2

Band function

Time interval is from   -0.352 sec. to    4.656 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]    : 24.6154  (-2.97929  3.7313)
R^2/D10^2   : 6.83659E-02  (-0.0255198   0.0369197)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.24     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.58e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.633e-08   9.523e-09
25- 50  2.045e-07   4.294e-08
50-150  9.207e-07   1.650e-07
15-150  1.161e-06   1.810e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-20.7851      -200)
Norm        : 11.5425       (-1.49436     1.49436)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   82.64     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.49e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.440e-07   8.128e-08
25- 50  2.771e-07   1.523e-07
50-150  6.077e-07   3.340e-07
15-150  1.029e-06   5.709e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.52619E-02        (0.822496      -0.0752619)
R1^2/D10^2  : 9.08017E+12        (-9.08017e+12      -9.08017e+12)
kT2 [keV]   : 24.6150        (-2.97892      3.73166)
R2^2/D10^2  : 6.83691E-02    (-0.0255231   0.0369164)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.24     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.93e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  0.000e+00   0.000e+00
25- 50  0.000e+00   0.000e+00
50-150  0.000e+00   0.000e+00
15-150  0.000e+00   0.000e+00

Peak spectrum fit

Power-law model

Time interval is from    0.516 sec. to    1.516 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.20353     ( -0.295158   0.281373 )
Norm@50keV  : 2.74116E-02    ( -0.00671304   0.00663545 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   78.70     using 59 bins.
 Reduced chi-squared = 1.3807
# Null hypothesis probability of 3.00e-02 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 3.21552 ( -0.82598  0.85194 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.77818e-07 ( -6.24407e-08  6.24021e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.516 sec. to    1.516 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -3.79557     ( -3.92018   2.31373 )
Epeak [keV] : 84.0149      ( -9.42104 11.7771 )
Norm@50keV  : 1.34383    ( -1.34383   12.3934 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.31     using 59 bins.
 Reduced chi-squared = 1.02339
# Null hypothesis probability of 4.26e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 3.06316 ( -0.67666  0.73043 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.33181e-07 ( -6.56525e-08  6.55225e-08 ) ergs/cm2

Band function

Time interval is from    0.516 sec. to    1.516 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]    : 22.8204  (-3.10285  3.67089)
R^2/D10^2   : 0.129130  (-0.0553787   0.0860164)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.97     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.69e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.223e-08   4.111e-09
25- 50  6.608e-08   2.263e-08
50-150  2.571e-07   6.750e-08
15-150  3.354e-07   9.160e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-52.257      -200)
Norm        : 14.9987       (-3.45396     3.45396)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   81.28     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.90e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.739e-08   2.248e-08
25- 50  7.193e-08   4.178e-08
50-150  1.577e-07   9.180e-08
15-150  2.671e-07   1.550e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 0.108473        (3.28998      -0.108473)
R1^2/D10^2  : 7.37972E+09        (-7.37972e+09      -7.37972e+09)
kT2 [keV]   : 22.8221        (-3.10194      3.67165)
R2^2/D10^2  : 0.129098    (-0.0553837   0.0860118)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.97     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.00e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  0.000e+00   0.000e+00
25- 50  0.000e+00   0.000e+00
50-150  0.000e+00   0.000e+00
15-150  0.000e+00   0.000e+00

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: 0.961923     ( -0.212188   0.200204 )
Norm@50keV  : 2.19009E-02    ( -0.00308999   0.00303231 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.98     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.39e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 5.008 sec: 2.51705 ( -0.357157  0.364439 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.20244e-06 ( -1.45005e-07  1.45013e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.981295     ( -1.58065   1.18292 )
Epeak [keV] : 102.128      ( -18.1694 54.3616 )
Norm@50keV  : 0.114519    ( -0.0711622   0.272205 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.89     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.38e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 5.008 sec: 2.30889 ( -0.35024  0.36824 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.17741e-06 ( -1.51497e-07  1.4996e-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)  = 2.17e-07
S(50-100 keV) = 4.46e-07

T90 vs. Hardness ratio plot

T90                                   = 4.46399998664856 sec.
Hardness ratio (energy fluence ratio) = 2.0553

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 4.32544
Count Ratio (50-100 keV) / (15-25 keV) = 6.79371

Mask shadow pattern

IMX = -1.470250168903059E+00, IMY = 5.365393966006989E-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:
-239.232000 -0.352000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9726 -15.6293    0.3  32.5  -33.2  18.3508  37.5    0.8	Sco X-1                       
254.2248  35.2790    0.0  23.5 -169.0  -0.7900  -1.8   12.0	Her X-1                       
268.3149  -1.5051    5.6  34.2  -83.4   1.6177   2.1    4.5	SW J1753.5-0127               
202.4599  38.1393    2.3  38.6  109.6   5.9599   5.0 ------	UNKNOWN                       
203.8802  18.5972    2.7  33.3   77.2   3.3532   4.2 ------	UNKNOWN                       
217.9841 -24.8539    2.0  45.9    4.6   3.5007   5.8 ------	UNKNOWN

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

Time interval of the image:
-0.352000 4.656000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
245.1589 -15.5452   11.1  32.5  -33.5   0.0389   1.0   11.8	Sco X-1                       
254.3972  35.5434    0.0  23.7 -169.1   0.0380   1.2   12.4	Her X-1                       
268.2358  -1.5054    4.4  34.1  -83.3  -0.1513  -2.6    8.5	SW J1753.5-0127               
243.6556  51.8729    2.9  35.8  163.1   0.1609   4.0 ------	UNKNOWN                       
284.7005  61.9041    1.0  55.8 -177.9   1.5691  11.4 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
128.668590 649.662400
660.768000 714.111100
720.768000 776.568610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.2300  35.3226    6.2  32.7  -22.7   1.9599   1.9   11.2	Her X-1                       
299.5846  35.2117    0.8  28.3  -98.9  18.9587  13.6    0.7	Cyg X-1                       
308.1164  40.9553 1017.2  25.3 -117.4   0.0116   0.0    0.3	Cyg X-3                       
325.9415  38.2158    7.6  34.5 -138.7   1.9627   1.5   12.6	Cyg X-2                       
356.5795  28.2412    2.5  56.9 -161.3  20.3713   4.7 ------	UNKNOWN

Plot creation:
Sun Mar  1 23:06:42 EST 2026