GRB210515C: 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: 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

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

  Refined 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 the analysis and refined 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 ] 

======================================================================
 
 
====== 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
 
 
====== 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: N/A)
 
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      -1.258    -0.281      0.284       -           -               -         1.00e-03     -1.62e-04          1.62e-04      53.900   57
CPL     -0.832    -0.668      1.332      139.995    -139.995      -139.995      1.63e-03     -7.73e-04          5.47e-03      53.450   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
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      -0.760     -0.415     0.470       -           -               -         5.54e-03     -1.40e-03          1.34e-03      50.960   57
CPL     -0.611     -1.941    -1.374      556.567      N/A           N/A         6.41e-03        N/A               N/A         50.980   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   6.06e-08  1.29e-07  2.16e-07  8.24e-07  5.95e-07  1.23e-06   erg/cm2
      90%_error_low -1.67e-08 -2.27e-08 -4.42e-08 -3.14e-07 -1.09e-07 -3.54e-07   erg/cm2
      90%_error_hi   1.80e-08  2.23e-08  4.37e-08  4.32e-07  1.11e-07  4.54e-07   erg/cm2
Peak flux       PL   1.13e-01  1.77e-01  2.09e-01  4.78e-01  6.38e-01  9.77e-01   ph/cm2/s
      90%_error_low -5.49e-02 -5.92e-02 -4.92e-02 -2.12e-01 -1.51e-01 -2.49e-01   ph/cm2/s
      90%_error_hi   6.77e-02  5.74e-02  4.86e-02  3.18e-01  1.52e-01  2.91e-01   ph/cm2/s
 
Fluence        CPL   5.62e-08  1.35e-07  2.22e-07  4.37e-07  5.74e-07  8.50e-07   erg/cm2
      90%_error_low -2.02e-08 -2.64e-08 -4.75e-08 -3.31e-07 -1.22e-07 -3.56e-07   erg/cm2
      90%_error_hi   2.08e-08  2.80e-08  4.93e-08  8.03e-07  1.22e-07  5.16e-07   erg/cm2
Peak flux      CPL   1.12e-01  1.77e-01  2.09e-01  4.71e-01  6.38e-01  9.64e-01   ph/cm2/s
      90%_error_low -6.87e-02 -5.98e-02 -4.94e-02 -4.71e-01 -1.55e-01 -3.94e-01   ph/cm2/s
      90%_error_hi   5.01e-02  5.98e-02  6.17e-02  1.65e-01  1.52e-01  2.75e-01   ph/cm2/s
 
======================================================================

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])

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   -2.528 sec. to   56.896 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.25792     ( -0.281329   0.284195 )
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     ( -0.668011   1.33164 )
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
 

1-s 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     ( -0.414803   0.470359 )
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     ( -0.320099   0.2467 )
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
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

S(15-50 keV)  = N/A
S(50-150 keV) = N/A

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 = -1.231402794661389E-01, IMY = 2.417502438582406E-02

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