batgrbproduct analysis for trigger=1277277

batgrbproduct Analysis for Trigger=1277277

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 22:01:23 EDT 2025
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1277277
======================================================================

  Trigger: 01277277      Segment: 000

  BAT Trigger Time: 757051069.952   [s; MET]
      Trigger Stop: 757051070.464   [s; MET]
               UTC: 2024-12-28T03:57:15.160580    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 344.824008424848   Dec: 18.6040815474546  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    20.9
     Image Trigger?:     NO
     Rate S/N Ratio:     97.1699542039616  [ if not an image trigger ]
     Image S/N Ratio:    20.9

  Flight Position:   [ source = BAT ]
    RA: 344.824008424848   Dec: 18.6040815474546  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 344.810542193093   Dec: 18.6078539635926  [deg; J2000]  
        { 22h 59m 14.5s , +18d 36' 28.3" }
         +/- 0.759889074371972 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.278990577965484 [arcmin] (formal 1-sigma fit error)
    SNR: 45.0272306205382
 
  Angular difference between Flight and Ground position is 0.798497 arcmin
 
  Partial Coding Fraction: 0.390625    [ including projection effects ]

  Duration
     T90: 8.067999958992 +/- 0.53329541361275
        Measured from: -4.34399998188019
                   to: 3.72399997711182     [s; relative to TRIGTIME]
     T50: 2.55200004577637 +/- 0.0699713805412762
        Measured from: 0.107999920845032
                   to: 2.6599999666214     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.94400000572205     
                   to: 2.94400000572205     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -5.1599999666214     
                   to: 4.77999997138977     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.465166   2.230185   1.291613   0.214324
           0.042622   0.048173   0.039448   0.025374 [error]
 Peak      0.368810   0.700469   0.461953   0.064053
           0.018609   0.023152   0.019276   0.009962 [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 5.80e-07 8.89e-07 1.02e-06 2.25e-06 3.15e-06 4.74e-06   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux Power-law 4.72e+00 4.50e+00 2.98e+00 3.08e+00 1.35e+01 1.53e+01   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
Fluence   Cutoff-PL 4.97e-07 9.57e-07 1.07e-06 8.14e-07 2.99e-06 3.34e-06   erg/cm2
              Error 3.56e-08 3.42e-08 4.50e-08 2.03e-07 1.07e-07 2.25e-07   erg/cm2
Peak flux Cutoff-PL 3.73e+00 5.20e+00 3.40e+00 9.68e-01 1.31e+01 1.33e+01   ph/cm2/s
              Error 3.68e-01 2.63e-01 1.90e-01 2.39e-01 5.89e-01 6.28e-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    1.799    0.000    -      -           3.45e-02 0.00e+00  115.190 57
CPL   0.946    0.243      61.7    5.6      9.22e-02 2.59e-02   72.080 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.591    0.000    -      -           1.05e-01 0.00e+00  131.340 57
CPL   0.175    0.333      64.3    5.2      5.55e-01 2.21e-01   60.980 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: 7.488000 sec.
T50 in the 50-300 keV band: 2.368000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    9.940   -5.160    4.780
T90     8.068   -4.344    3.724
T50     2.552    0.108    2.660
Peak    1.000    1.944    2.944

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
  344.8105    18.6079   0.0043    32.4074  -114.4663         5.5217561     45.027 TRIG_01277277                 
 
Foreground time interval of the image:
 -5.160   4.780 (delta_t =   9.940 [sec])
Background time interval of the image:
-64.051  -5.160 (delta_t =  58.891 [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 0.512000

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 0.512000

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 0.512000

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   -5.160 sec. to    4.780 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.79891     (     )
Norm@50keV  : 3.44806E-02    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  115.19     using 59 bins.
 Reduced chi-squared = 2.02088
# Null hypothesis probability of 8.11e-06 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 9.94 sec: 4.74961 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.15585e-06 ( 0  0 ) ergs/cm2

Cutoff power-law model

Time interval is from   -5.160 sec. to    4.780 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.946135     ( -0.250039   0.236668 )
Epeak [keV] : 61.7042      ( -4.65677 6.50135 )
Norm@50keV  : 9.21794E-02    ( -0.0216196   0.0302628 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   72.08     using 59 bins.
 Reduced chi-squared = 1.28714
# Null hypothesis probability of 7.27e-02 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 9.94 sec: 4.52746 ( -0.16192  0.16249 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.99292e-06 ( -1.06857e-07  1.06896e-07 ) ergs/cm2

Band function

Time interval is from   -5.160 sec. to    4.780 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]    : 13.2288  (  )
R^2/D10^2   : 0.794284  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  239.86     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.74e-24 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.929e-07   1.511e-08
25- 50  1.028e-06   3.837e-08
50-150  1.149e-06   6.710e-08
15-150  2.469e-06   8.101e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 107.840       (-10.9879      12.9038)
Norm        : 20.5794       (-0.887342     0.947935)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   77.54     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.65e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.344e-07   3.613e-08
25- 50  9.377e-07   4.031e-08
50-150  1.584e-06   3.613e-07
15-150  3.056e-06   3.926e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.08860        (-0.812601      0.833537)
R1^2/D10^2  : 3.29379        (-0.835009      1.26068)
kT2 [keV]   : 24.4058        (-2.98719      4.3789)
R2^2/D10^2  : 5.23432E-02    (-0.0255189   0.0388869)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.76     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.73e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.450e-07   3.737e-08
25- 50  1.002e-06   6.620e-08
50-150  1.543e-06   2.520e-07
15-150  2.990e-06   3.081e-07

Peak spectrum fit

Power-law model

Time interval is from    1.944 sec. to    2.944 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.59150     (     )
Norm@50keV  : 0.104953    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  131.34     using 59 bins.
 Reduced chi-squared = 2.30421
# Null hypothesis probability of 8.44e-08 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 13.4522 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.82698e-07 ( 0  0 ) ergs/cm2

Cutoff power-law model

Time interval is from    1.944 sec. to    2.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.175162     ( -0.344542   0.320626 )
Epeak [keV] : 64.3101      ( -4.55824 5.93546 )
Norm@50keV  : 0.555414    ( -0.171208   0.270796 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.98     using 59 bins.
 Reduced chi-squared = 1.08893
# Null hypothesis probability of 3.02e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 13.0786 ( -0.5883  0.5888 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.33577e-07 ( -4.5624e-08  4.57777e-08 ) ergs/cm2

Band function

Time interval is from    1.944 sec. to    2.944 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]    : 14.3836  (-0.619203  0.648107)
R^2/D10^2   : 1.90076  (-0.284446   0.331963)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  111.47     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.17e-05 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.283e-08   5.955e-09
25- 50  3.163e-07   1.700e-08
50-150  4.368e-07   3.235e-08
15-150  8.359e-07   3.815e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 162.890       (-25.5398      35.3784)
Norm        : 56.7716       (-2.68295     2.78186)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   97.69     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.44e-04 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.447e-07   9.350e-09
25- 50  2.714e-07   2.100e-08
50-150  5.536e-07   1.535e-07
15-150  9.697e-07   1.686e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 9.08349        (-1.60535      1.74573)
R1^2/D10^2  : 5.77314        (-1.91209      3.51535)
kT2 [keV]   : 23.3339        (-3.90334      9.13067)
R2^2/D10^2  : 0.202711    (-0.152923   0.162399)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.41     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.59e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.130e-07   1.779e-08
25- 50  3.096e-07   4.070e-08
50-150  5.204e-07   1.831e-07
15-150  9.429e-07   2.240e-07

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: 1.79891     (     )
Norm@50keV  : 3.44806E-02    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  115.19     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.11e-06 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 9.94 sec: 4.74924 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.15537e-06 ( 0  0 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.946121     ( -0.250033   0.236673 )
Epeak [keV] : 61.7039      ( -4.65671 6.5014 )
Norm@50keV  : 9.21810E-02    ( -0.02162   0.0302624 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   72.08     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.27e-02 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 9.94 sec: 4.52680 ( -0.16185  0.16243 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.99385e-06 ( -1.06915e-07  1.06865e-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)  = 8.89e-07
S(50-100 keV) = 1.02e-06

T90 vs. Hardness ratio plot

T90                                   = 8.067999958992 sec.
Hardness ratio (energy fluence ratio) = 1.14736

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.52214
Count Ratio (50-100 keV) / (15-25 keV) = 0.881547

Mask shadow pattern

IMX = -2.629074649383593E-01, IMY = 5.777981538541936E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

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:
-64.051400 -5.160000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0532  40.8930   54.1  46.3  -55.5   0.1118   0.2    4.4	Cyg X-3                       
326.2993  38.2597    4.6  34.2  -67.4   0.4659   2.5    7.1	Cyg X-2                       
 31.2429 -10.1488    2.3  55.2  169.3   2.5401   5.1 ------	UNKNOWN                       
 23.6546  -1.6784    2.6  45.0  175.9   1.0054   4.5 ------	UNKNOWN                       
340.7708  27.1099    2.0  29.0  -97.5   0.9015   5.9 ------	UNKNOWN                       
303.6291  50.0129    2.3  46.1  -42.2   1.4561   5.0 ------	UNKNOWN

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

Time interval of the image:
-5.160000 4.780000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.1742  40.8368    4.0  46.3  -55.6  -1.0606  -2.9    7.5	Cyg X-3                       
326.0624  38.2186   11.6  34.4  -67.3   0.1233   1.0    8.0	Cyg X-2                       
 27.8978  -1.2692    4.2  45.7  170.0   0.3163   2.7 ------	UNKNOWN                       
249.9007  73.6052    2.3  57.9   -3.1   1.6690   5.0 ------	UNKNOWN                       
 16.6142  -5.4363    3.1  47.6 -173.7   0.4461   3.7 ------	UNKNOWN                       
  9.7332  19.7285    2.8  22.2 -162.6   0.2590   4.1 ------	UNKNOWN                       
316.4344  63.4921    2.1  37.9  -23.0   0.5352   5.5 ------	UNKNOWN                       
344.8105  18.6079    0.3  32.4 -114.5   5.5218  45.0 ------	UNKNOWN                       
339.0840  22.9471    2.8  32.8 -101.7   0.5732   4.1 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
80.148610 104.028000
105.048000 1101.188000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5773  35.2440    1.5  43.2  -27.8  16.5587   7.5    2.6	Cyg X-1                       
308.0852  40.8632    5.7  38.4  -16.6   3.7314   2.0    5.5	Cyg X-3                       
326.1119  38.1631   11.2  25.4   -5.8   1.3851   1.0    9.9	Cyg X-2                       
334.6952   6.5172    2.5  15.6 -109.4   5.9035   4.7 ------	UNKNOWN                       
  2.5622 -37.8302    3.0  58.9 -166.2  29.6268   3.9 ------	UNKNOWN                       
319.8246   8.6475    2.9  26.2  -78.9   6.3787   4.1 ------	UNKNOWN                       
311.8151   6.1047    2.5  34.5  -76.9  10.9204   4.7 ------	UNKNOWN

Plot creation:
Fri Jun 20 01:58:32 EDT 2025