GRB120218A: 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.

ADD SPECIAL NOTE BY HAND

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Thu Dec 17 16:58:28 EST 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger515277
======================================================================

  Trigger: 00515277      Segment: 000

  BAT Trigger Time: 351218970.048   [s; MET]
      Trigger Stop: 351218978.24   [s; MET]
               UTC: 2012-02-18T00:49:22.145800    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 319.757959799859   Dec: -25.4504975119872  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.67
     Image Trigger?:     NO
     Rate S/N Ratio:     27.0370116691915  [ if not an image trigger ]
     Image S/N Ratio:    9.67

  Analysis Position:   [ source = BAT ]
    RA: 319.757959799859   Dec: -25.4504975119872  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 319.766883892088   Dec: -25.4625644609474  [deg; J2000]  
        { 21h 19m 04.1s , -25d 27' 45.2" }
         +/- 1.51578464101334 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.614677434546317 [arcmin] (formal 1-sigma fit error)
    SNR: 16.7905454804452
 
  Angular difference between the analysis and refined position is 0.870594 arcmin
 
  Partial Coding Fraction: 0.04638672    [ including projection effects ]

  Duration
     T90: 31.3759999871254 +/- 2.29722614249124
        Measured from: -24.3279999494553
                   to: 7.04800003767014     [s; relative to TRIGTIME]
     T50: 18.6240000724792 +/- 3.45523143398606
        Measured from: -15.5920000076294
                   to: 3.03200006484985     [s; relative to TRIGTIME]


======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   35.008  -26.696    8.312
T90    31.376  -24.328    7.048
T50    18.624  -15.592    3.032
Peak    1.000    2.332    3.332
 
 
====== 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      N/A        N/A       N/A          -           -               -           N/A           N/A               N/A         N/A        N/A   
CPL     N/A        N/A        N/A          N/A         N/A           N/A           N/A           N/A               N/A         N/A        N/A   
 
 
=== 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      N/A         N/A       N/A          -           -               -           N/A           N/A               N/A         N/A        N/A   
CPL     N/A         N/A       N/A          N/A         N/A           N/A           N/A           N/A               N/A         N/A        N/A   
 
 
=== 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    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2

Special notes of this burst

Image

Pre-slew 15.0-350.0 keV image (Event data with DETECTION mask)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  319.7669   -25.4626   0.0114    48.6202   -54.0292         9.6681733     16.791 TRIG_00515277                 
 
Foreground time interval of the image:
-26.696   8.312 (delta_t =  35.008 [sec])
Background time interval of the image:
-239.048 -26.696 (delta_t = 212.352 [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

Multiple GTIs in the spectrum
tstart tstop
Photon index:       (       )

Cutoff power-law model

Multiple GTIs in the spectrum
tstart tstop
Photon index:       (       )

1-s peak spectrum fit

Power-law model

Time interval is from    0.000 sec. to    8.192 sec.
Photon index:       (       )

Cutoff power-law model

Time interval is from    0.000 sec. to    8.192 sec.
Photon index:       (       )

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 (with DETECTION mask)

IMX = 6.667169370131198E-01, IMY = 9.186420166486740E-01

Spacecraft aspect plot

Bright source in the event data image

Event data image of 15-350 keV band

Time interval of the image:
-26.696000 8.312000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3870  35.2171    3.3  38.8  111.8   0.5350   3.4    8.3	Her X-1                       
262.9374 -24.8769    7.1  47.2   16.9   0.1999   1.6    8.8	GX 1+4                        
268.3506  -1.2949   10.7  26.7   39.0  -0.0734  -1.1    9.5	SW J1753.5-0127               
270.3708 -25.1984   12.5  43.8    8.8   0.0923   0.9    8.6	GX 5-1                        
270.2392 -25.5576    0.0  44.1    8.7   0.3468   3.4   11.6	GRS 1758-258                  
273.8506 -14.0996    7.2  32.5   13.1  -0.1218  -1.6    9.8	GX 17+2                       
275.8392 -30.2699   11.5  46.4   -0.4  -0.1124  -1.0    7.3	H1820-303                     
285.1795 -24.8148    3.4  39.1  -10.3  -0.3071  -3.4   10.1	HT1900.1-2455                 
288.8339  10.7771    7.0   3.5    9.5   0.1011   1.6   10.3	GRS 1915+105                  
299.5939  35.2716    8.9  22.9 -178.6  -0.0851  -1.3    4.2	Cyg X-1                       
307.9873  40.9216    7.6  31.0 -171.8  -0.1091  -1.5    5.9	Cyg X-3                       
326.1361  38.5329    0.0  39.9 -152.7   0.1062   1.1   12.8	Cyg X-2                       
262.8512 -33.9066    6.8  54.6   10.2   0.4228   1.7    8.1	GX 354-0                      
247.2614 -18.8568    2.8  53.7   35.5   2.5573   4.2 ------	UNKNOWN                       
331.0758  47.1537    2.3  47.3 -161.0   0.5703   5.0 ------	UNKNOWN                       
319.7668 -25.4626    0.7  48.6  -54.0   9.6695  16.5 ------	UNKNOWN                       

Webpage updated on:
Thu Dec 17 17:13:27 EST 2015