GRB110315A: 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 23:42:52 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger449399
======================================================================

  Trigger: 00449399      Segment: 000

  BAT Trigger Time: 321926231.296   [s; MET]
      Trigger Stop: 321926235.392   [s; MET]
               UTC: 2011-03-15T23:57:04.537480    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 279.191126332668   Dec: 17.5321484999389  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.06
     Image Trigger?:     NO
     Rate S/N Ratio:     9.74679434480896  [ if not an image trigger ]
     Image S/N Ratio:    11.06

  Analysis Position:   [ source = BAT ]
    RA: 279.191126332668   Dec: 17.5321484999389  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 279.204684110321   Dec: 17.5367582609684  [deg; J2000]  
        { 18h 36m 49.1s , +17d 32' 12.3" }
         +/- 1.03659230859771 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.361548924956912 [arcmin] (formal 1-sigma fit error)
    SNR: 28.8949044519654
 
  Angular difference between the analysis and refined position is 0.823507 arcmin
 
  Partial Coding Fraction: 0.5703125    [ including projection effects ]

  Duration
     T90: 87.6759999394417 +/- 11.8267709656415
        Measured from: -60.6359999775887
                   to: 27.039999961853     [s; relative to TRIGTIME]
     T50: 32.5839999318123 +/- 2.15692374081893
        Measured from: -20.7519999742508
                   to: 11.8319999575615     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 3.12800002098083     
                   to: 4.12800002098083     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -66.7639999985695     
                   to: 38.839999973774     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.083191   2.569981   1.654212   0.375730
           0.095410   0.088663   0.076001   0.068294 [error]
 Peak      0.059155   0.078618   0.041313   0.021078
           0.009719   0.009618   0.008157   0.006943 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  105.604  -66.764   38.840
T90    87.676  -60.636   27.040
T50    32.584  -20.752   11.832
Peak    1.000    3.128    4.128
 
 
====== 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: 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      -1.767    -0.081      0.080       -           -               -         4.19e-03     -1.81e-04          1.81e-04      48.500   57
CPL     -1.655    -0.183      0.327      155.622     -81.334      -155.622      4.76e-03     -8.08e-04          2.08e-03      48.120   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      -1.658     -0.247     0.242       -           -               -         1.30e-02     -1.92e-03          1.90e-03      69.980   57
CPL     -1.153     -0.721     1.473       80.310     -80.310       -80.310      2.40e-02     -2.40e-02          1.17e-01      69.390   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   7.26e-07  1.13e-06  1.33e-06  3.03e-06  4.08e-06  6.22e-06   erg/cm2
      90%_error_low -5.51e-08 -5.06e-08 -7.70e-08 -3.69e-07 -1.81e-07 -4.25e-07   erg/cm2
      90%_error_hi   5.66e-08  5.04e-08  7.69e-08  4.02e-07  1.81e-07  4.50e-07   erg/cm2
Peak flux       PL   6.24e-01  5.72e-01  3.62e-01  3.52e-01  1.70e+00  1.91e+00   ph/cm2/s
      90%_error_low -1.43e-01 -8.53e-02 -6.73e-02 -1.16e-01 -2.48e-01 -2.69e-01   ph/cm2/s
      90%_error_hi   1.52e-01  8.45e-02  6.65e-02  1.45e-01  2.48e-01  2.69e-01   ph/cm2/s
 
Fluence        CPL   7.11e-07  1.14e-06  1.34e-06  2.56e-06  4.04e-06  5.75e-06   erg/cm2
      90%_error_low -6.89e-08 -5.72e-08 -8.03e-08 -9.26e-07 -2.08e-07 -9.52e-07   erg/cm2
      90%_error_hi   5.67e-08  5.83e-08  8.13e-08  5.70e-07  2.05e-07  6.39e-07   erg/cm2
Peak flux      CPL   5.77e-01  6.02e-01  3.74e-01  1.98e-01  1.67e+00  1.75e+00   ph/cm2/s
      90%_error_low -1.78e-01 -1.02e-01 -7.33e-02 -1.98e-01 -2.62e-01 -3.18e-01   ph/cm2/s
      90%_error_hi   1.80e-01  1.14e-01  7.62e-02  1.93e-01  2.59e-01  3.37e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  279.2047    17.5368   0.0066    40.4920  -170.6491         6.5049972     28.895 TRIG_00449399                 
 
Foreground time interval of the image:
-66.764  35.405 (delta_t = 102.169 [sec])
Background time interval of the image:
-239.296 -66.764 (delta_t = 172.532 [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  -66.764 sec. to   38.840 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.76706     ( -0.0809815   0.080343 )
Norm@50keV  : 4.18892E-03    ( -0.000181151   0.000180617 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.50 using 59 PHA bins.
# Reduced chi-squared =         0.8508 for     57 degrees of freedom 
# Null hypothesis probability =   7.812731e-01
 
Photon flux (15-150 keV)    in 105.6 sec: 0.570044 ( -0.026018  0.026126 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.07863e-06 ( -1.80791e-07  1.81313e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -66.764 sec. to   38.840 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.65503     ( -0.183149   0.326623 )
Epeak [keV] : 155.622      ( -81.3396 -155.628 )
Norm@50keV  : 4.75883E-03    ( -0.000807525   0.00208478 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.12 using 59 PHA bins.
# Reduced chi-squared =         0.8593 for     56 degrees of freedom 
# Null hypothesis probability =   7.639419e-01
 
Photon flux (15-150 keV)    in 105.6 sec: 0.565455 ( -0.028762  0.028458 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.04161e-06 ( -2.0768e-07  2.05017e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    3.128 sec. to    4.128 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.65803     ( -0.247375   0.241913 )
Norm@50keV  : 1.30166E-02    ( -0.0019233   0.00190256 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.98 using 59 PHA bins.
# Reduced chi-squared =          1.228 for     57 degrees of freedom 
# Null hypothesis probability =   1.159081e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.70424 ( -0.2477  0.24845 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.20979e-07 ( -1.86685e-08  1.88573e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    3.128 sec. to    4.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.15338     ( -0.720559   1.47342 )
Epeak [keV] : 80.3096      ( -80.3644 -80.3644 )
Norm@50keV  : 2.39688E-02    ( -0.0239443   0.117054 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.39 using 59 PHA bins.
# Reduced chi-squared =          1.239 for     56 degrees of freedom 
# Null hypothesis probability =   1.078293e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.67055 ( -0.26219  0.25934 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16445e-07 ( -2.1793e-08  2.12157e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 87.676 sec.
Hardness ratio (energy fluence ratio) = 1.17524944186

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

S(15-50 keV)  = 1.8602779e-06
S(50-150 keV) = 2.2183582e-06

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 = -8.424927693442371E-01, IMY = 1.387327467616037E-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:
-239.296000 -66.764000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9813 -15.6396    0.4  26.0   98.2   7.2703  28.4    0.1	Sco X-1                       
255.9185 -37.8373    1.4  20.6   35.6   1.5295   8.0    3.3	4U 1700-377                   
256.3032 -36.4328    4.9  19.4   37.9   0.4407   2.3    6.4	GX 349+2                      
263.0921 -24.7381    2.0   8.2   69.0   0.9593   5.7    4.6	GX 1+4                        
264.5677 -44.2850    0.0  22.8   11.3   0.3553   2.0   12.4	4U 1735-44                    
268.4029  -1.4177    4.3  21.1  169.2   0.5183   2.7    3.0	SW J1753.5-0127               
270.2820 -25.0678    2.6   3.1   21.5   0.8424   4.5    0.7	GX 5-1                        
270.2121 -25.7243    4.5   3.7   18.3   0.4879   2.6    5.0	GRS 1758-258                  
274.1583 -14.0741    6.2   8.5 -165.0   0.3360   1.9    9.2	GX 17+2                       
275.7520 -30.5174    0.0   9.0  -25.1   0.2403   1.4   12.7	H1820-303                     
285.2083 -25.0269    4.1  12.7  -76.7   0.5053   2.9   11.3	HT1900.1-2455                 
288.7978  10.9331    1.5  37.2 -153.2   1.8614   7.8    0.7	GRS 1915+105                  
262.9226 -33.7791    2.5  13.8   29.9   0.7627   4.6    4.7	GX 354-0                      
238.7225 -14.2669    2.8  32.2   96.8   1.3778   4.1 ------	UNKNOWN                       
303.7665  23.2510    2.9  55.2 -145.3   5.1629   4.0 ------	UNKNOWN                       

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

Time interval of the image:
-66.764000 35.404600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
245.0054 -15.5518    2.5  26.0   98.5   1.0023   4.6    5.5	Sco X-1                       
256.0181 -37.8361  187.2  20.5   35.4  -0.0098  -0.1    1.6	4U 1700-377                   
256.4355 -36.4234    4.7  19.3   37.7   0.3839   2.5    0.0	GX 349+2                      
263.1589 -24.9078    0.0   8.2   67.7  -0.1132  -0.8   12.7	GX 1+4                        
264.7258 -44.3397    6.9  22.8   11.0   0.2513   1.7    6.7	4U 1735-44                    
268.5000  -1.6065    0.0  20.9  169.4   0.2843   1.8   12.2	SW J1753.5-0127               
270.4251 -24.9344    8.3   2.9   20.2   0.1992   1.4   11.6	GX 5-1                        
270.4748 -25.6065    4.8   3.5   15.3   0.3582   2.5   12.4	GRS 1758-258                  
273.9717 -13.9578    3.7   8.6 -166.4   0.4312   3.1    5.1	GX 17+2                       
275.8936 -30.2176   11.8   8.8  -26.7  -0.1358  -1.0    9.1	H1820-303                     
284.9679 -25.0468    4.7  12.5  -76.4  -0.3596  -2.5    8.4	HT1900.1-2455                 
288.6538  11.1028    0.0  37.3 -153.5   0.4243   2.1   12.7	GRS 1915+105                  
263.0800 -33.6935    6.4  13.7   29.7  -0.2431  -1.8    9.6	GX 354-0                      
228.9457 -42.1475    2.7  40.6   48.7   1.7341   4.2 ------	UNKNOWN                       
279.2047  17.5367    0.4  40.5 -170.6   6.5046  28.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
93.804590 559.304600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9749 -15.6469    0.8  47.3   41.5  18.9665  13.6    0.5	Sco X-1                       
254.4593  35.3465   19.1  28.3  128.0  -0.2761  -0.6    0.3	Her X-1                       
262.9863 -24.7232    3.2  45.1   15.0   2.4604   3.6    1.8	GX 1+4                        
268.4278  -1.4826    2.3  21.8   24.3   1.5682   5.0    4.0	SW J1753.5-0127               
270.2438 -25.1034    3.7  43.5    5.9   1.6705   3.1    2.6	GX 5-1                        
270.1980 -25.6868    4.2  44.1    5.7   1.5347   2.7    6.6	GRS 1758-258                  
273.9243 -14.0241    3.2  32.0    3.7   1.4073   3.6    4.8	GX 17+2                       
275.8884 -30.4985    5.4  48.1   -2.1  -1.5225  -2.2    8.1	H1820-303                     
284.9562 -24.9355    9.3  42.8  -13.6   0.6147   1.3    4.4	HT1900.1-2455                 
288.8081  10.9442    0.5  11.4  -62.0   7.4452  24.6    0.6	GRS 1915+105                  
299.6094  35.1995    2.2  25.3 -144.1   1.6935   5.2    0.9	Cyg X-1                       
308.0637  41.1269   14.0  34.2 -145.6   0.3553   0.8   10.7	Cyg X-3                       
326.3090  38.3049    7.2  45.9 -132.7   1.7817   1.6    6.5	Cyg X-2                       
263.0931 -33.9582    5.0  53.7   10.6   3.1858   2.3    9.0	GX 354-0                      
239.8359  17.0201    3.4  37.5   89.4   3.7733   3.4 ------	UNKNOWN                       
245.3513  18.2019    2.2  32.2   90.6   3.7251   5.3 ------	UNKNOWN                       
268.3370  23.7797    3.2  11.9  117.6   1.1412   3.6 ------	UNKNOWN                       
286.5694  71.5135    3.5  54.2  177.0   4.2523   3.3 ------	UNKNOWN                       
303.5440  39.8085    3.0  30.7 -147.5   1.2951   3.9 ------	UNKNOWN                       
335.6099  50.0656    5.6  55.3 -145.3   5.0587   2.1 ------	UNKNOWN