batgrbproduct analysis for trigger=1048618

batgrbproduct Analysis for Trigger=1048618

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): Fri Jul 29 23:14:10 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1048618
======================================================================

  Trigger: 01048618      Segment: 000

  BAT Trigger Time: 642801721.984   [s; MET]
      Trigger Stop: 642801724.032   [s; MET]
               UTC: 2021-05-15T20:01:34.960160    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 1.0503397560906   Dec: -15.0106404456402  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.28
     Image Trigger?:     NO
     Rate S/N Ratio:     10  [ if not an image trigger ]
     Image S/N Ratio:    7.28

  Flight Position:   [ source = BAT ]
    RA: 1.0503397560906   Dec: -15.0106404456402  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 1.09772845717517   Dec: -14.9685834008557  [deg; J2000]  
        { 00h 04m 23.5s , -14d 58' 06.9" }
         +/- 1.95227719195429 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.759434427589127 [arcmin] (formal 1-sigma fit error)
    SNR: 11.6965861002841
 
  Angular difference between Flight and Ground position is 3.729788 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 55.7120000123978 +/- 26.7011202425988
        Measured from: -1.79199993610382
                   to: 53.9200000762939     [s; relative to TRIGTIME]
     T50: 15.904000043869 +/- 16.8634991491163
        Measured from: 1.34399998188019
                   to: 17.2480000257492     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.836000084877014     
                   to: 1.83600008487701     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.52799999713898     
                   to: 56.8960000276566     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.178139   0.410120   0.258238   0.082466
           0.049572   0.051551   0.046631   0.043042 [error]
 Peak      0.008450   0.034401   0.026467   0.024840
           0.006583   0.007077   0.006525   0.005869 [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 6.06e-08 1.29e-07 2.16e-07 8.26e-07 5.94e-07 1.23e-06   erg/cm2
              Error 1.74e-08 2.25e-08 4.40e-08 3.73e-07 1.10e-07 4.04e-07   erg/cm2
Peak flux Power-law 1.13e-01 1.77e-01 2.09e-01 4.78e-01 6.38e-01 9.77e-01   ph/cm2/s
              Error 6.13e-02 5.83e-02 4.89e-02 2.65e-01 1.52e-01 2.70e-01   ph/cm2/s
 
Fluence   Cutoff-PL 5.63e-08 1.35e-07 2.22e-07 4.37e-07 5.74e-07 8.50e-07   erg/cm2
              Error 2.05e-08 2.72e-08 4.84e-08 5.67e-07 1.22e-07 4.36e-07   erg/cm2
Peak flux Cutoff-PL 1.12e-01 1.77e-01 2.09e-01 4.71e-01 6.38e-01 9.64e-01   ph/cm2/s
              Error 5.94e-02 5.98e-02 5.55e-02 3.18e-01 1.53e-01 3.35e-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    1.258    0.283    -      -           1.00e-03 1.62e-04   53.900 57
CPL   0.832    1.000     140.0    0.0      1.63e-03 3.12e-03   53.450 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.760    0.443    -      -           5.54e-03 1.37e-03   50.960 57
CPL   2.232    0.283      69.8    0.0      9.86e-05 0.00e+00   49.800 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: 8.320000 sec.
T50 in the 50-300 keV band: 4.096000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   59.424   -2.528   56.896
T90    55.712   -1.792   53.920
T50    15.904    1.344   17.248
Peak    1.000    0.836    1.836

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
    1.0977   -14.9686   0.0164     7.1527  -168.8929         0.9031220     11.697 TRIG_01048618                 
 
Foreground time interval of the image:
 -2.528  28.917 (delta_t =  31.445 [sec])
Background time interval of the image:
-239.984  -2.528 (delta_t = 237.456 [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   -2.528 sec. to   56.896 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.25792     ( -0.284195   0.281329 )
Norm@50keV  : 1.00175E-03    ( -0.000162152   0.000161689 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   53.90     using 59 bins.
 Reduced chi-squared = 0.945614
# Null hypothesis probability of 5.92e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 59.42 sec: 0.118636 ( -0.0192284  0.019252 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.94557e-07 ( -1.09165e-07  1.11196e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -2.528 sec. to   56.896 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.832177     ( -1.33164   0.668011 )
Epeak [keV] : 139.995      ( -139.995 -139.995 )
Norm@50keV  : 1.63103E-03    ( -0.0007734   0.00546883 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   53.45     using 59 bins.
 Reduced chi-squared = 0.954464
# Null hypothesis probability of 5.72e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 59.42 sec: 0.116412 ( -0.0201468  0.02004 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.7371e-07 ( -1.21924e-07  1.22199e-07 ) ergs/cm2

Band function

Time interval is from   -2.528 sec. to   56.896 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]    : 17.2236  (-3.38937  4.4364)
R^2/D10^2   : 8.78874E-03  (-0.00467028   0.00954406)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.88     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.72e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.144e-08   1.112e-08
25- 50  1.405e-07   4.323e-08
50-150  2.989e-07   1.022e-07
15-150  4.709e-07   1.157e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-65.2008      -200)
Norm        : 0.485445       (-0.0786997     0.0786997)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.32     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.00e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.183e-08   4.115e-08
25- 50  1.382e-07   7.888e-08
50-150  3.030e-07   1.713e-07
15-150  5.130e-07   2.862e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.64574        (-4.45389      6.07661)
R1^2/D10^2  : 7.32128E-02        (-0.0583975      1.85277)
kT2 [keV]   : 27.7872        (-9.76474      -27.7872)
R2^2/D10^2  : 1.45824E-03    (-0.00143499   0.00551409)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   53.28     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.41e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.533e-08   3.120e-08
25- 50  1.371e-07   7.428e-08
50-150  3.823e-07   2.227e-07
15-150  5.747e-07   2.980e-07

Peak spectrum fit

Power-law model

Time interval is from    0.836 sec. to    1.836 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.759879     ( -0.470359   0.414803 )
Norm@50keV  : 5.54097E-03    ( -0.00140393   0.00134422 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   50.96     using 59 bins.
 Reduced chi-squared = 0.894035
# Null hypothesis probability of 7.00e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.637956 ( -0.151126  0.152248 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.58749e-08 ( -1.59669e-08  1.61055e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.836 sec. to    1.836 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.23164     ( -0.2467   0.320099 )
Epeak [keV] : 69.8079      (   )
Norm@50keV  : 9.85655E-05    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.80     using 59 bins.
 Reduced chi-squared = 0.889286
# Null hypothesis probability of 7.07e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.637655 ( -0.154678  0.151927 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.58537e-08 ( -1.66067e-08  1.53676e-08 ) ergs/cm2

Band function

Time interval is from    0.836 sec. to    1.836 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]    : 29.0543  (-9.13072  17.3168)
R^2/D10^2   : 1.03481E-02  (-0.00736861   0.0212625)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   54.41     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.73e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.393e-09   7.538e-10
25- 50  8.481e-09   4.687e-09
50-150  5.117e-08   2.821e-08
15-150  6.105e-08   2.936e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-63.4581      -200)
Norm        : 2.52149       (-0.631347     0.631347)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.50     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.51e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.282e-09   3.855e-09
25- 50  1.208e-08   7.215e-09
50-150  2.650e-08   1.566e-08
15-150  4.487e-08   2.730e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 9.14501        (-4.06742      8.94565)
R1^2/D10^2  : 0.200647        (-0.178476      1.23346)
kT2 [keV]   : 51.5469        (-45.8631      -50.7497)
R2^2/D10^2  : 1.87513E-03    (-0.001888   0.00673053)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.67     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.78e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.824e-09   2.393e-09
25- 50  1.104e-08   6.270e-09
50-150  5.151e-08   2.965e-08
15-150  6.637e-08   3.513e-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: 1.14672     ( -0.24001   0.234594 )
Norm@50keV  : 1.71195E-03    ( -0.000224275   0.000224274 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   43.53     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.06e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 31.44 sec: 0.199571 ( -0.0266779  0.0267429 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.5463e-07 ( -8.2182e-08  8.32698e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.06400     ( -1.01133   0.313214 )
Epeak [keV] : 599.082      ( -599.192 -599.192 )
Norm@50keV  : 1.87717E-03    ( -0.00187714   0.00370337 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   43.50     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.88e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 31.44 sec: 0.198821 ( -0.027511  0.027195 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.51351e-07 ( -9.21664e-08  8.59915e-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)  = 1.29e-07
S(50-100 keV) = 2.16e-07

T90 vs. Hardness ratio plot

T90                                   = 55.7120000123978 sec.
Hardness ratio (energy fluence ratio) = 1.67442

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 2.30225
Count Ratio (50-100 keV) / (15-25 keV) = 1.44964

Mask shadow pattern

IMX = -1.231402794661389E-01, IMY = 2.417502438582406E-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:
-239.984000 -2.528000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
335.8294 -60.2352    4.0  42.8   44.9   1.9584   2.9 ------	UNKNOWN                       
341.4129 -10.6640    2.5  23.5  140.6   1.4750   4.6 ------	UNKNOWN                       
351.8042  34.7537    3.5  57.6 -165.4   4.1506   3.3 ------	UNKNOWN                       
355.3478  37.2635    3.5  59.6 -161.5   7.9010   3.3 ------	UNKNOWN                       
 12.2336  32.7357    3.4  55.4 -145.0   4.8512   3.4 ------	UNKNOWN                       
 39.7682  -2.1027    4.1  40.9  -88.3   3.9743   2.8 ------	UNKNOWN

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

Time interval of the image:
-2.528000 28.916600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 21.9468 -57.1449    2.4  37.9    8.7   0.5906   4.9 ------	UNKNOWN                       
 17.6535 -51.8860    2.0  32.1    8.3   0.5638   5.8 ------	UNKNOWN                       
357.2802 -17.8307    2.1   6.7  152.0   0.3933   5.5 ------	UNKNOWN                       
  1.0977 -14.9686    1.0   7.2 -168.9   0.9031  11.7 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
58.316600 949.616600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
319.2355 -28.1924    2.8  40.8   96.4   9.5594   4.1 ------	UNKNOWN                       
 17.4309 -35.7383    3.9  25.4    0.1   2.4472   2.9 ------	UNKNOWN                       
 21.4603  25.6350    3.2  45.3 -121.4  10.3558   3.6 ------	UNKNOWN

Plot creation:
Sat Jul 30 07:01:06 EDT 2022