batgrbproduct analysis for trigger=1281241

batgrbproduct Analysis for Trigger=1281241

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): Thu Jun 19 21:46:28 EDT 2025
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1281241
======================================================================

  Trigger: 01281241      Segment: 000

  BAT Trigger Time: 758532834.368   [s; MET]
      Trigger Stop: 758532838.464   [s; MET]
               UTC: 2025-01-14T07:33:19.475360    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 166.590269450428   Dec: -15.1431759434439  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.87
     Image Trigger?:     NO
     Rate S/N Ratio:     9.38083151964686  [ if not an image trigger ]
     Image S/N Ratio:    6.87

  Flight Position:   [ source = BAT ]
    RA: 166.590269450428   Dec: -15.1431759434439  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 166.57326303913   Dec: -15.1259127661014  [deg; J2000]  
        { 11h 06m 17.6s , -15d 07' 33.3" }
         +/- 1.93962552300671 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.777549869128453 [arcmin] (formal 1-sigma fit error)
    SNR: 11.8057293453966
 
  Angular difference between Flight and Ground position is 1.429361 arcmin
 
  Partial Coding Fraction: 0.2128906    [ including projection effects ]

  Duration
     T90: 293.999999880791 +/- 11.6913108780233
        Measured from: -1.23199999332428
                   to: 292.767999887466     [s; relative to TRIGTIME]
     T50: 247.799999952316 +/- 13.3155770081395
        Measured from: 15.9839999675751
                   to: 263.783999919891     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.73199999332428     
                   to: 2.73199999332428     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -8.52799999713898     
                   to: 305.987999916077     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.873293   2.750325   1.617055   0.158898
           0.145640   0.152613   0.129226   0.108118 [error]
 Peak      0.034810   0.100065   0.033620   0.008854
           0.014338   0.016588   0.013529   0.010543 [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 6.76e-07 1.05e-06 1.24e-06 2.80e-06 3.77e-06 5.76e-06   erg/cm2
              Error 6.96e-08 7.25e-08 1.22e-07 5.54e-07 2.93e-07 6.75e-07   erg/cm2
Peak flux Power-law 5.05e-01 4.96e-01 3.41e-01 3.70e-01 1.49e+00 1.71e+00   ph/cm2/s
              Error 2.03e-01 1.36e-01 1.02e-01 2.07e-01 3.94e-01 4.38e-01   ph/cm2/s
 
Fluence   Cutoff-PL 5.63e-07 1.23e-06 1.25e-06 4.91e-07 3.40e-06 3.52e-06   erg/cm2
              Error 8.21e-08 1.00e-07 1.49e-07 3.09e-07 3.08e-07 4.24e-07   erg/cm2
Peak flux Cutoff-PL 3.10e-01 8.70e-01 1.55e-01 2.71e-04 1.34e+00 1.34e+00   ph/cm2/s
              Error 2.38e-01 3.29e-01 2.15e-01 1.10e-01 4.20e-01 4.25e-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    1.771    0.115    -      -           1.31e-03 9.81e-05   66.380 57
CPL   0.319    0.614      52.5    6.9      7.97e-03 6.94e-03   44.180 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.539    0.375    -      -           1.18e-02 3.05e-03   52.690 57
CPL  -5.492    0.534      39.2   31.0      2.29e+02 9.30e+04   47.940 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: 288.704000 sec.
T50 in the 50-300 keV band: 182.976000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  314.516   -8.528  305.988
T90   294.000   -1.232  292.768
T50   247.800   15.984  263.784
Peak    1.000    1.732    2.732

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
  166.5733   -15.1259   0.0163    41.2124    39.3327         2.3632415     11.806 TRIG_01281241                 
 
Foreground time interval of the image:
 -8.528  34.933 (delta_t =  43.461 [sec])
Background time interval of the image:
-189.467  -8.528 (delta_t = 180.939 [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 4.096000

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 4.096000

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 4.096000

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   -8.528 sec. to  305.988 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.77116     ( -0.113315   0.115775 )
Norm@50keV  : 1.30632E-03    ( -9.84502e-05   9.77144e-05 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   66.38     using 59 bins.
 Reduced chi-squared = 1.16456
# Null hypothesis probability of 1.85e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 314.5 sec: 0.178043 ( -0.012347  0.012358 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.7873e-06 ( -2.91953e-07  2.94486e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -8.528 sec. to  305.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.319043     ( -0.653623   0.573746 )
Epeak [keV] : 52.5270      ( -5.57228 8.21992 )
Norm@50keV  : 7.96688E-03    ( -0.00401468   0.00986437 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   44.18     using 59 bins.
 Reduced chi-squared = 0.788929
# Null hypothesis probability of 8.73e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 314.5 sec: 0.168779 ( -0.012762  0.01279 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.41012e-06 ( -3.0277e-07  3.13885e-07 ) ergs/cm2

Band function

Time interval is from   -8.528 sec. to  305.988 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]    : 12.2971  (-0.870444  0.939061)
R^2/D10^2   : 4.09227E-02  (-0.00985597   0.0128689)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   61.61     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.15e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.123e-07   4.450e-08
25- 50  1.335e-06   1.054e-07
50-150  1.233e-06   1.898e-07
15-150  2.981e-06   2.271e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 99.4782       (-20.5614      30.5586)
Norm        : 0.798601       (-0.0724187     0.0806636)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.65     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.39e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.565e-07   7.391e-08
25- 50  1.134e-06   9.105e-08
50-150  1.832e-06   5.991e-07
15-150  3.622e-06   6.542e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.29643        (-2.0628      2.38871)
R1^2/D10^2  : 0.216515        (-0.127321      0.411907)
kT2 [keV]   : 16.5880        (-2.64804      5.28718)
R2^2/D10^2  : 1.03247E-02    (-0.00758952   0.0124347)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   43.55     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.67e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.664e-07   2.418e-07
25- 50  1.218e-06   4.798e-07
50-150  1.595e-06   7.476e-07
15-150  3.380e-06   1.447e-06

Peak spectrum fit

Power-law model

Time interval is from    1.732 sec. to    2.732 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.53949     ( -0.377608   0.372064 )
Norm@50keV  : 1.18058E-02    ( -0.00305193   0.00304173 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.69     using 59 bins.
 Reduced chi-squared = 0.924386
# Null hypothesis probability of 6.37e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.49026 ( -0.39314  0.39552 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.11309e-07 ( -2.99061e-08  3.02476e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    1.732 sec. to    2.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -5.49250     ( 4.10657   5.17539 )
Epeak [keV] : 39.1881      ( -7.33013 54.7433 )
Norm@50keV  : 229.366    ( -249.112   185673 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.94     using 59 bins.
 Reduced chi-squared = 0.856071
# Null hypothesis probability of 7.70e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.33675 ( -0.376799  0.46293 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.46793e-08 ( -2.19296e-08  4.99787e-08 ) ergs/cm2

Band function

Time interval is from    1.732 sec. to    2.732 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]    : 11.9545  (-2.44516  3.68255)
R^2/D10^2   : 0.429770  (-0.276798   0.580064)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.69     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.75e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.299e-08   6.087e-09
25- 50  4.069e-08   1.767e-08
50-150  3.487e-08   1.759e-08
15-150  8.855e-08   3.608e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 169.507       (-100.254      -168.503)
Norm        : 6.32331       (-1.65488     2.25744)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.33     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.87e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.605e-08   9.480e-09
25- 50  3.026e-08   1.745e-08
50-150  6.268e-08   3.813e-08
15-150  1.090e-07   6.505e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 39.2332        (-39.1553      -39.1553)
R1^2/D10^2  : 2.92035E-03        (-0.00299663      0.530562)
kT2 [keV]   : 9.92821        (-9.92262      3.47653)
R2^2/D10^2  : 0.709714    (-0.710136   1.25822)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   46.15     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.97e-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: 1.76714     ( -0.173182   0.178635 )
Norm@50keV  : 3.95023E-03    ( -0.000465658   0.000460774 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.26     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.66e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 43.46 sec: 0.537556 ( -0.0590571  0.0591342 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.58267e-06 ( -1.90153e-07  1.92103e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.304876     ( -1.00681   0.831386 )
Epeak [keV] : 53.6830      ( -8.26826 15.2952 )
Norm@50keV  : 2.39758E-02    ( -0.0152015   0.0580872 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.14     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.95e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 43.46 sec: 0.513943 ( -0.060296  0.060466 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.45141e-06 ( -1.92758e-07  2.00903e-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)  = 1.05e-06
S(50-100 keV) = 1.24e-06

T90 vs. Hardness ratio plot

T90                                   = 293.999999880791 sec.
Hardness ratio (energy fluence ratio) = 1.18095

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.46818
Count Ratio (50-100 keV) / (15-25 keV) = 0.863215

Mask shadow pattern

IMX = 6.774258983073298E-01, IMY = -5.551123439441540E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

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:
-189.467400 -8.528000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4433  35.4179    6.2  57.4 -159.0  -2.4346  -1.9    4.6	Her X-1                       
166.1463 -42.9965    2.4  56.0    7.3   5.5258   4.9 ------	UNKNOWN

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

Time interval of the image:
-8.528000 34.932600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5430  35.2765    3.9  57.4 -158.8   1.0309   2.9    5.8	Her X-1                       
191.9232  48.4514    2.4  48.9  142.2   2.0594   4.8 ------	UNKNOWN                       
166.5732 -15.1259    1.0  41.2   39.3   2.3628  11.8 ------	UNKNOWN                       
244.8192  25.3320    1.9  45.5 -152.1   0.8793   6.1 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
116.132600 962.709500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5776 -40.3620    0.0  36.9    5.8   1.5227   1.0   11.8	Vela X-1                      
170.2409 -60.7026    4.0  45.6  -37.5   6.1252   2.9    5.3	Cen X-3                       
186.6679 -62.6449    8.4  49.6  -47.0   7.0017   1.4    7.5	GX 301-2                      
137.0892  -1.4602    3.5  32.1   77.4   7.0745   3.3 ------	UNKNOWN                       
114.4184 -36.8147    3.1  50.9   19.6   7.4171   3.8 ------	UNKNOWN                       
129.5385 -40.7049    3.1  41.0    9.1   5.9363   3.7 ------	UNKNOWN                       
155.3058 -22.1439    2.2  12.8   20.0   4.6124   5.2 ------	UNKNOWN                       
195.3554 -38.4875    3.3  34.4  -76.8   6.2926   3.5 ------	UNKNOWN

Plot creation:
Fri Jun 20 01:54:44 EDT 2025