GRB250114A: Summary Image Light curves Spectra Distribution Others

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: 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

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

  Refined 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 the analysis and refined 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 ] 

======================================================================
 
 
====== 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
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: CPL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.771    -0.116      0.113       -           -               -         1.31e-03     -9.84e-05          9.77e-05      66.380   57
CPL     -0.319    -0.574      0.654       52.527      -5.572         8.220      7.97e-03     -4.01e-03          9.86e-03      44.180   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.539     -0.373     0.377       -           -               -         1.18e-02     -3.05e-03          3.04e-03      52.690   57
CPL      1.195     -2.264    -1.195       48.593     -15.273        46.800      4.55e-01     -4.55e-01          1.86e+05      48.440   56
 
 
=== 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         PL   6.77e-07  1.05e-06  1.24e-06  2.80e-06  3.79e-06  5.77e-06   erg/cm2
      90%_error_low -6.88e-08 -7.24e-08 -1.22e-07 -5.19e-07 -2.92e-07 -6.49e-07   erg/cm2
      90%_error_hi   7.03e-08  7.25e-08  1.23e-07  5.89e-07  2.94e-07  7.01e-07   erg/cm2
Peak flux       PL   5.05e-01  4.96e-01  3.41e-01  3.70e-01  1.49e+00  1.71e+00   ph/cm2/s
      90%_error_low -1.94e-01 -1.37e-01 -1.02e-01 -1.73e-01 -3.93e-01 -4.38e-01   ph/cm2/s
      90%_error_hi   2.13e-01  1.35e-01  1.01e-01  2.40e-01  3.96e-01  4.39e-01   ph/cm2/s
 
Fluence        CPL   5.63e-07  1.23e-06  1.25e-06  4.90e-07  3.41e-06  3.53e-06   erg/cm2
      90%_error_low -8.16e-08 -9.91e-08 -1.50e-07 -2.25e-07 -3.03e-07 -3.71e-07   erg/cm2
      90%_error_hi   8.27e-08  1.01e-07  1.47e-07  3.92e-07  3.14e-07  4.77e-07   erg/cm2
Peak flux      CPL   3.10e-01  8.70e-01  1.55e-01  2.71e-04  1.34e+00  1.34e+00   ph/cm2/s
      90%_error_low -1.81e-01 -3.89e-01 -1.14e-01 -2.71e-04 -3.77e-01 -3.83e-01   ph/cm2/s
      90%_error_hi   2.95e-01  2.69e-01  3.17e-01  2.19e-01  4.63e-01  4.67e-01   ph/cm2/s
 
======================================================================

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])

Light Curves

Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

Full-time range; 1 s binning

Other quick-look light curves:

• 64 ms binning (zoomed)
• 16 ms binning (zoomed)
• 8 ms binning (zoomed)
• 2 ms binning (zoomed)
• SN=5 or 10 s binning (full-time range)
• Raw light curve

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     ( -0.115775   0.113315 )
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     ( -0.573746   0.653623 )
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
 

1-s 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     ( -0.372064   0.377608 )
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: 5.4925     ( -5.17539   -4.10657 )
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
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 294.0 sec.
Hardness ratio (energy fluence ratio) = 1.01316477273

S(15-50 keV) vs. S(50-150 keV) plot

S(15-50 keV)  = 1.795016e-06
S(50-150 keV) = 1.6150792e-06

The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.

Mask shadow pattern

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

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