GRB120320A: 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 v2.46
    Process Start Time: Mon Jan 13 05:27:20 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger518200
======================================================================

  Trigger: 00518200      Segment: 000

  BAT Trigger Time: 353937383.616   [s; MET]
      Trigger Stop: 353937410.496   [s; MET]
               UTC: 2012-03-20T11:56:15.603640    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 212.53789490183   Dec: 8.68498369747149  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.06
     Image Trigger?:     NO
     Rate S/N Ratio:     12.9614813968157  [ if not an image trigger ]
     Image S/N Ratio:    10.06

  Analysis Position:   [ source = BAT ]
    RA: 212.53789490183   Dec: 8.68498369747149  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 212.51656289908   Dec: 8.68152229462087  [deg; J2000]  
        { 14h 10m 04.0s , +08d 40' 53.5" }
         +/- 1.60948988386926 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.741459408410574 [arcmin] (formal 1-sigma fit error)
    SNR: 15.4116610679366
 
  Angular difference between the analysis and refined position is 1.282182 arcmin
 
  Partial Coding Fraction: 0.6015625    [ including projection effects ]

  Duration
     T90: 24.9759999513626 +/- 3.54538684013936
        Measured from: 0.84799998998642
                   to: 25.823999941349     [s; relative to TRIGTIME]
     T50: 16.9359999299049 +/- 2.80228762218953
        Measured from: 6.27200001478195
                   to: 23.2079999446869     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 24.0960000157356     
                   to: 25.0960000157356     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.015999972820282     
                   to: 29.8560000061989     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.290419   0.380584   0.281643   0.039128
           0.041247   0.037120   0.032255   0.027736 [error]
 Peak      0.020071   0.014868   0.025458   0.010549
           0.007453   0.006923   0.005914   0.005137 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   29.872   -0.016   29.856
T90    24.976    0.848   25.824
T50    16.936    6.272   23.208
Peak    1.000   24.096   25.096
 
 
====== 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      -1.572    -0.185      0.183       -           -               -         2.20e-03     -2.47e-04          2.45e-04      64.130   57
CPL     -0.314    -0.842      1.053       63.285     -11.992        35.891      9.96e-03     -6.26e-03          2.48e-02      56.990   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      -1.163     -0.529     0.577       -           -               -         4.42e-03     -1.32e-03          1.31e-03      66.160   57
CPL     -0.532     -8.054     8.645      123.028    -123.028      -123.028      8.85e-03     -8.85e-03          3.86e+01      66.050   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   8.96e-08  1.58e-07  2.12e-07  5.86e-07  6.16e-07  1.05e-06   erg/cm2
      90%_error_low -1.54e-08 -1.76e-08 -3.08e-08 -1.60e-07 -7.40e-08 -1.90e-07   erg/cm2
      90%_error_hi   1.62e-08  1.75e-08  3.08e-08  1.97e-07  7.50e-08  2.18e-07   erg/cm2
Peak flux       PL   1.32e-01  1.62e-01  1.45e-01  2.23e-01  5.16e-01  6.62e-01   ph/cm2/s
      90%_error_low -7.16e-02 -6.17e-02 -4.78e-02 -1.25e-01 -1.60e-01 -1.99e-01   ph/cm2/s
      90%_error_hi   8.93e-02  5.93e-02  4.67e-02  2.06e-01  1.63e-01  2.08e-01   ph/cm2/s
 
Fluence        CPL   7.41e-08  1.78e-07  2.17e-07  1.24e-07  5.53e-07  5.93e-07   erg/cm2
      90%_error_low -1.84e-08 -2.25e-08 -3.72e-08 -7.62e-08 -8.04e-08 -1.10e-07   erg/cm2
      90%_error_hi   1.90e-08  2.34e-08  3.62e-08  1.96e-07  8.43e-08  2.05e-07   erg/cm2
Peak flux      CPL   1.15e-01  1.70e-01  1.53e-01  1.16e-01  5.00e-01  5.51e-01   ph/cm2/s
      90%_error_low -1.15e-01 -6.77e-02 -5.49e-02 -1.16e-01 -2.08e-01 -2.59e-01   ph/cm2/s
      90%_error_hi   1.04e-01  7.75e-02  6.35e-02  1.45e-01  1.67e-01  2.36e-01   ph/cm2/s
 
======================================================================

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  212.5166     8.6815   0.0125    23.7030   117.8942         1.1165221     15.412 TRIG_00518200                 
 
Foreground time interval of the image:
 -0.016  29.856 (delta_t =  29.872 [sec])
Background time interval of the image:
-239.616  -0.016 (delta_t = 239.600 [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   -0.016 sec. to   29.856 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.57166     ( -0.184875   0.182645 )
Norm@50keV  : 2.19649E-03    ( -0.000246774   0.00024529 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.13 using 59 PHA bins.
# Reduced chi-squared =          1.125 for     57 degrees of freedom 
# Null hypothesis probability =   2.408850e-01
 
Photon flux (15-150 keV)    in 29.87 sec: 0.279845 ( -0.030725  0.030796 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.15893e-07 ( -7.40474e-08  7.50236e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.016 sec. to   29.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.313765     ( -0.841526   1.05251 )
Epeak [keV] : 63.2855      ( -11.9922 35.8908 )
Norm@50keV  : 9.96299E-03    ( -0.00626168   0.0248162 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.99 using 59 PHA bins.
# Reduced chi-squared =          1.018 for     56 degrees of freedom 
# Null hypothesis probability =   4.379510e-01
 
Photon flux (15-150 keV)    in 29.87 sec: 0.263681 ( -0.032345  0.032458 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.52643e-07 ( -8.04435e-08  8.42922e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   24.096 sec. to   25.096 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.16338     ( -0.528555   0.577085 )
Norm@50keV  : 4.41818E-03    ( -0.00132342   0.00131253 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.16 using 59 PHA bins.
# Reduced chi-squared =          1.161 for     57 degrees of freedom 
# Null hypothesis probability =   1.900653e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.516091 ( -0.16038  0.162813 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.53064e-08 ( -1.41864e-08  1.44301e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   24.096 sec. to   25.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.531579     ( -8.05471   8.64422 )
Epeak [keV] : 123.028      ( -122.844 -122.844 )
Norm@50keV  : 8.84831E-03    ( -0.00886787   38.6472 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.05 using 59 PHA bins.
# Reduced chi-squared =          1.179 for     56 degrees of freedom 
# Null hypothesis probability =   1.685526e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.500175 ( -0.207882  0.167478 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.30844e-08 ( -1.8897e-08  1.6286e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 24.976 sec.
Hardness ratio (energy fluence ratio) = 1.21971981754

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

S(15-50 keV)  = 2.5214465e-07
S(50-150 keV) = 3.0050075e-07

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 = -2.053962601929236E-01, IMY = -3.880213364858037E-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:
-239.616000 -0.016000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9728 -15.6387    0.2  17.6  -86.9  17.6455  69.0    0.4	Sco X-1                       
254.4611  35.3767    4.9  50.9 -172.7   1.4637   2.4    2.1	Her X-1                       
256.0729 -37.9751    7.4  38.2  -56.9   0.7358   1.6    8.9	4U 1700-377                   
256.5297 -36.3130    6.8  37.4  -59.3   0.8297   1.7    8.0	GX 349+2                      
262.8184 -24.8450    0.0  36.5  -80.4   0.8863   1.6   12.0	GX 1+4                        
268.3585  -1.5706    4.9  40.6 -118.7   1.4202   2.3    7.1	SW J1753.5-0127               
262.8927 -33.7747   10.6  40.3  -67.4  -0.7150  -1.1    6.0	GX 354-0                      
197.0102  18.2257    4.2  41.2  111.3   2.5349   2.7 ------	UNKNOWN                       
217.0223 -47.6052    2.5  39.6   -8.5   1.4571   4.6 ------	UNKNOWN                       
266.3770  31.8104    2.7  54.8 -160.4   3.0835   4.2 ------	UNKNOWN                       
269.8885  30.8267    3.0  56.5 -157.1   3.8119   3.8 ------	UNKNOWN                       

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

Time interval of the image:
-0.016000 29.856000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
245.1360 -15.5360    4.3  17.7  -87.4   0.1747   2.7   11.0	Sco X-1                       
254.4214  35.4891    8.3  51.0 -172.8   0.2042   1.4    9.0	Her X-1                       
255.9988 -37.7160    8.2  38.0  -57.1  -0.1615  -1.4    7.7	4U 1700-377                   
256.5541 -36.2997  112.9  37.4  -59.3   0.0116   0.1    9.4	GX 349+2                      
263.1903 -24.6862    6.1  36.7  -80.9  -0.2492  -1.9   10.5	GX 1+4                        
268.3156  -1.4148   56.6  40.6 -118.9   0.0317   0.2    3.9	SW J1753.5-0127               
263.1368 -33.9566    0.0  40.5  -67.3  -0.5541  -3.2   10.4	GX 354-0                      
212.5166   8.6816    0.7  23.7  117.9   1.1165  15.4 ------	UNKNOWN                       
201.0140 -54.3044    2.3  50.1    0.0   0.6867   5.1 ------	UNKNOWN                       
210.0382 -54.8055    2.6  47.9   -6.3   0.4909   4.4 ------	UNKNOWN                       
222.0925 -56.4712    2.3  47.6  -15.8   0.5673   5.0 ------	UNKNOWN                       
254.4001 -54.3792    2.4  49.8  -40.0   0.9586   4.7 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
154.684590 962.510000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9754 -15.6332    0.3  40.3  -39.2  37.1548  42.1    0.5	Sco X-1                       
207.6997  13.1204    3.1   6.5  147.2   1.6755   3.8 ------	UNKNOWN                       
224.5604 -41.5813    2.4  51.5    2.4   5.9154   4.9 ------	UNKNOWN                       
211.1101  59.3227    3.5  50.7 -167.1   4.2325   3.3 ------	UNKNOWN