GRB110305A

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 23:53:46 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger448229
======================================================================

  Trigger: 00448229      Segment: 000

  BAT Trigger Time: 320999887.936   [s; MET]
      Trigger Stop: 320999892.032   [s; MET]
               UTC: 2011-03-05T06:38:01.212340    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 260.877330338745   Dec: -15.7900383779732  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.2
     Image Trigger?:     NO
     Rate S/N Ratio:     13.9283882771841  [ if not an image trigger ]
     Image S/N Ratio:    7.2

  Analysis Position:   [ source = BAT ]
    RA: 260.877330338745   Dec: -15.7900383779732  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 260.875140191826   Dec: -15.799752811987  [deg; J2000]  
        { 17h 23m 30.0s , -15d 47' 59.1" }
         +/- 1.84881494100128 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.943587676916032 [arcmin] (formal 1-sigma fit error)
    SNR: 12.642764083763
 
  Angular difference between the analysis and refined position is 0.596424 arcmin
 
  Partial Coding Fraction: 0.2226562    [ including projection effects ]

  Duration
     T90: 12 +/- 2.23606797749979
        Measured from: -0.935999989509583
                   to: 11.0640000104904     [s; relative to TRIGTIME]
     T50: 6 +/- 1
        Measured from: 1.06400001049042
                   to: 7.06400001049042     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 6.06400001049042     
                   to: 7.06400001049042     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.935999989509583     
                   to: 12.0640000104904     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.365885   0.445813   0.384308   0.013428
           0.046604   0.046825   0.041321   0.037057 [error]
 Peak      0.052180   0.047498   0.050391   0.004253
           0.012654   0.013238   0.011904   0.010519 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   13.000   -0.936   12.064
T90    12.000   -0.936   11.064
T50     6.000    1.064    7.064
Peak    1.000    6.064    7.064
 
 
====== 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      -1.589    -0.195      0.192       -           -               -         6.55e-03     -7.49e-04          7.42e-04      64.760   57
CPL     -1.301    -0.376      0.761      120.284    -120.284      -120.284      9.19e-03     -3.30e-03          1.26e-02      64.220   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      -1.704     -0.482     0.443       -           -               -         9.38e-03     -2.78e-03          2.68e-03      56.560   57
CPL     -1.040     -1.543     2.170       69.482      N/A           N/A         2.10e-02        N/A               N/A         56.080   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   1.18e-07  2.06e-07  2.74e-07  7.43e-07  7.98e-07  1.34e-06   erg/cm2
      90%_error_low -2.11e-08 -2.32e-08 -4.11e-08 -2.12e-07 -9.76e-08 -2.50e-07   erg/cm2
      90%_error_hi   2.21e-08  2.31e-08  4.09e-08  2.62e-07  9.87e-08  2.90e-07   erg/cm2
Peak flux       PL   4.69e-01  4.19e-01  2.57e-01  2.40e-01  1.25e+00  1.39e+00   ph/cm2/s
      90%_error_low -1.80e-01 -1.12e-01 -9.54e-02 -1.38e-01 -3.30e-01 -3.67e-01   ph/cm2/s
      90%_error_hi   1.97e-01  1.11e-01  9.49e-02  2.13e-01  3.30e-01  3.70e-01   ph/cm2/s
 
Fluence        CPL   1.13e-07  2.12e-07  2.78e-07  4.79e-07  7.81e-07  1.08e-06   erg/cm2
      90%_error_low -2.48e-08 -1.43e-08 -4.33e-08 -2.93e-07 -1.05e-07 -3.14e-07   erg/cm2
      90%_error_hi   2.49e-08  2.82e-08  4.45e-08  3.32e-07  1.06e-07  3.63e-07   erg/cm2
Peak flux      CPL   4.25e-01  4.50e-01  2.70e-01  1.19e-01  1.22e+00  1.26e+00   ph/cm2/s
      90%_error_low -2.18e-01 -1.30e-01 -1.07e-01 -1.19e-01 -3.36e-01 -3.65e-01   ph/cm2/s
      90%_error_hi   2.23e-01  1.41e-01  1.13e-01  1.77e-01  3.36e-01  4.04e-01   ph/cm2/s
 
======================================================================

Special notes of this burst

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  260.8751   -15.7998   0.0153    35.6026    62.8952         1.2229148     12.643 TRIG_00448229                 
 
Foreground time interval of the image:
 -0.936  12.064 (delta_t =  13.000 [sec])
Background time interval of the image:
-151.835  -0.936 (delta_t = 150.899 [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

Bokeh Plot

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   -0.936 sec. to   12.064 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.58938     ( -0.195119   0.192205 )
Norm@50keV  : 6.55026E-03    ( -0.000748981   0.000742182 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.76 using 59 PHA bins.
# Reduced chi-squared =          1.136 for     57 degrees of freedom 
# Null hypothesis probability =   2.242971e-01
 
Photon flux (15-150 keV)    in 13 sec: 0.839019 ( -0.093405  0.093569 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.97523e-07 ( -9.7627e-08  9.86947e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.936 sec. to   12.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.30141     ( -0.376134   0.761347 )
Epeak [keV] : 120.284      ( -120.288 -120.288 )
Norm@50keV  : 9.18918E-03    ( -0.00329784   0.0126015 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.22 using 59 PHA bins.
# Reduced chi-squared =          1.147 for     56 degrees of freedom 
# Null hypothesis probability =   2.106426e-01
 
Photon flux (15-150 keV)    in 13 sec: 0.828125 ( -0.096898  0.096809 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.80608e-07 ( -1.05267e-07  1.0584e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    6.064 sec. to    7.064 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.70375     ( -0.48233   0.442972 )
Norm@50keV  : 9.37719E-03    ( -0.00277693   0.00267588 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.56 using 59 PHA bins.
# Reduced chi-squared =         0.9923 for     57 degrees of freedom 
# Null hypothesis probability =   4.915585e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.24709 ( -0.329594  0.33003 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.6808e-08 ( -2.60085e-08  2.68212e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    6.064 sec. to    7.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.04045     ( -1.54228   2.17055 )
Epeak [keV] : 69.4822      (   )
Norm@50keV  : 2.09565E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.08 using 59 PHA bins.
# Reduced chi-squared =          1.001 for     56 degrees of freedom 
# Null hypothesis probability =   4.718627e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.22126 ( -0.335799  0.33593 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.3372e-08 ( -2.64238e-08  2.80164e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 12.0 sec.
Hardness ratio (energy fluence ratio) = 1.32929059638

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

S(15-50 keV)  = 3.239996e-07
S(50-150 keV) = 4.735238e-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 = 3.262225522227327E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -151.835400 -0.936000

# RAcent #  [deg] 255.9731 -37.7834 256.4128 -36.5258 263.1519 -24.7934 264.7008 -44.5478 268.3858  -1.5916 270.3030 -25.1158 270.1961 -25.5514 273.8386 -14.0877 276.0702 -30.4203 285.0277 -24.9104 288.7853  10.9427 299.4471  35.1884 308.0752 326.3125  38.4074 263.1460 -33.8376 329.9779  26.8726 338.2525   3.8806

Pre-slew

 Time interval of the image: -0.936000 12.064000

# RAcent #  [deg] 255.8484 -37.7947 256.4641 -36.4534 263.1129 -24.6411 264.7083 -44.2657 268.2431  -1.3229 270.3202 -25.1807 270.1217 -25.8296 273.9234 -14.1482 275.7821 -30.3052 285.0731 -25.0831 288.9598  11.0032 299.5035  35.2388 308.0399  40.8451 326.0749  38.3616 262.8868 -33.6626 260.8751 -15.7997

Post-slew

 Time interval of the image: 93.164590 962.121800

# RAcent #  [deg] 244.9764 -15.6409 254.5739  35.3274 256.0032 -37.8416 256.4409 -36.4112 263.0459 -24.7103 264.7412 -44.3005 268.2169  -1.5914 270.2649 -25.0666 270.1938 -25.7676 273.9519 -14.0155 275.8383 -30.3728 285.1241 -24.7728 288.8067  10.9401 262.9767 -33.7750 222.6842 -22.4776 246.2664 -67.0554 283.4214 -64.1239 299.2049  11.4660 308.4892 -48.0925

IMY = -6.373634552866851E-01 source in the pre-burst/pre-slew/post-slew images

image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 4.7 47.4 33.7 1.3892 2.5 3.7 4U 1700-377 6.2 46.5 35.0 0.9540 1.9 6.3 GX 349+2 12.1 36.1 47.1 0.2759 1.0 8.3 GX 1+4 5.5 46.2 20.9 -0.7886 -2.1 6.1 4U 1735-44 3.7 28.4 90.2 0.7956 3.1 8.4 SW J1753.5-0127 2.3 30.4 41.2 1.1275 5.2 2.4 GX 5-1 0.0 30.8 40.6 0.1424 0.6 12.9 GRS 1758-258 8.2 23.0 61.0 0.2751 1.4 10.2 GX 17+2 7.1 29.8 26.6 0.3429 1.6 8.2 H1820-303 19.3 20.5 20.0 0.0935 0.6 0.8 HT1900.1-2455 1.0 19.8 147.6 2.0472 11.6 0.8 GRS 1915+105 4.1 42.7 173.6 0.7849 2.8 7.1 Cyg X-1 40.9580 127.1 49.6 -178.5 -0.0341 -0.1 1.6 Cyg X-3 11.6 53.7 -161.1 -0.5093 -1.0 8.4 Cyg X-2 6.3 40.4 34.2 0.5760 1.8 7.8 GX 354-0 2.9 47.4 -147.9 1.4478 4.0 ------ UNKNOWN 2.9 43.4 -114.0 3.3492 4.0 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 5.2 47.5 33.8 0.3449 2.2 7.2 4U 1700-377 6.9 46.4 35.0 0.2359 1.7 2.3 GX 349+2 19.8 36.1 47.4 0.0465 0.6 8.4 GX 1+4 7.6 46.0 21.2 0.1531 1.5 11.2 4U 1735-44 6.9 28.6 90.7 -0.1132 -1.7 10.8 SW J1753.5-0127 5.4 30.5 41.1 -0.1272 -2.1 6.4 GX 5-1 0.0 31.0 40.2 0.0494 0.8 11.1 GRS 1758-258 10.7 22.9 60.8 -0.0553 -1.1 8.2 GX 17+2 18.3 29.9 27.1 -0.0338 -0.6 8.3 H1820-303 11.9 20.6 19.6 0.0375 1.0 10.0 HT1900.1-2455 7.3 19.8 148.1 0.0686 1.6 10.1 GRS 1915+105 4.8 42.8 173.7 -0.1652 -2.4 4.8 Cyg X-1 5.5 49.5 -178.5 -0.1919 -2.1 7.2 Cyg X-3 5.7 53.5 -161.2 0.2317 2.0 5.1 Cyg X-2 6.9 40.5 34.6 0.1535 1.7 11.5 GX 354-0 0.9 35.6 62.9 1.2228 12.6 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 0.2 15.3 84.1 43.9858 74.5 0.2 Sco X-1 92.5 51.5 169.1 0.2781 0.1 5.8 Her X-1 0.8 22.5 5.8 8.8918 13.9 0.8 4U 1700-377 2.4 21.0 5.7 3.1051 4.9 0.8 GX 349+2 1.8 9.1 -16.7 3.8616 6.4 2.9 GX 1+4 4.9 28.7 -10.1 1.6642 2.4 9.0 4U 1735-44 0.0 15.9 -156.7 0.7825 1.2 12.3 SW J1753.5-0127 1.6 12.8 -46.2 4.7807 7.4 1.3 GX 5-1 4.1 13.2 -43.9 1.8197 2.8 6.1 GRS 1758-258 3.6 12.7 -100.7 2.1030 3.2 3.4 GX 17+2 2.4 20.0 -44.9 3.1763 4.9 4.5 H1820-303 7.4 24.4 -68.8 1.4471 1.5 10.1 HT1900.1-2455 1.5 38.4 -136.7 9.3430 7.9 0.6 GRS 1915+105 4.8 18.1 -9.9 1.4856 2.4 3.6 GX 354-0 2.4 36.6 69.1 7.8125 4.7 ------ UNKNOWN 3.4 52.1 2.8 5.7477 3.4 ------ UNKNOWN 5.0 50.7 -16.8 3.3309 2.3 ------ UNKNOWN 3.0 46.7 -127.8 10.8033 3.9 ------ UNKNOWN 4.8 50.5 -44.1 8.3747 2.4 ------ UNKNOWN

Analysis Summary

Notes:

Image

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

Light Curves

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:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

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

Mask shadow pattern

Spacecraft aspect plot

Bright

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