GRB080520

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 20 01:50:00 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger312047
======================================================================

  Trigger: 00312047      Segment: 000

  BAT Trigger Time: 233014827.584   [s; MET]
      Trigger Stop: 233014829.632   [s; MET]
               UTC: 2008-05-20T22:20:24.778640    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 280.191885316142   Dec: -55.003825646117  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.7
     Image Trigger?:     NO
     Rate S/N Ratio:     10.6301458127346  [ if not an image trigger ]
     Image S/N Ratio:    8.7

  Analysis Position:   [ source = BAT ]
    RA: 280.191885316142   Dec: -55.003825646117  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 280.193945024291   Dec: -54.9655922327671  [deg; J2000]  
        { 18h 40m 46.5s , -54d 57' 56.1" }
         +/- 2.29903343420742 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.02204662051792 [arcmin] (formal 1-sigma fit error)
    SNR: 9.26030119778863
 
  Angular difference between the analysis and refined position is 2.295101 arcmin
 
  Partial Coding Fraction: 1    [ including projection effects ]

  Duration
     T90: 3.324000030756 +/- 0.861895610176173
        Measured from: -0.131999999284744
                   to: 3.19200003147125     [s; relative to TRIGTIME]
     T50: 1.74399998784065 +/- 0.776672417691704
        Measured from: 0.276000022888184
                   to: 2.02000001072884     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0200000107288361     
                   to: 1.02000001072884     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.311999976634979     
                   to: 3.32400000095367     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.089738   0.055799   0.003052   0.010998
           0.010875   0.010333   0.008713   0.007576 [error]
 Peak      0.029001   0.022705   0.003692   0.003752
           0.005837   0.005519   0.004556   0.003973 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    3.636   -0.312    3.324
T90     3.324   -0.132    3.192
T50     1.744    0.276    2.020
Peak    1.000    0.020    1.020
 
 
====== 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      -3.080    -0.577      0.463       -           -               -         1.30e-03     -5.46e-04          6.04e-04      55.790   57
CPL     -1.899     N/A        N/A           2.643      N/A           N/A         8.41e-03        N/A               N/A         55.340   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      -2.586     -0.724     0.549       -           -               -         2.36e-03     -1.15e-03          1.16e-03      44.940   57
CPL     -1.588      N/A       N/A          14.534      N/A           N/A         1.03e-02        N/A               N/A         44.480   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   2.72e-08  1.95e-08  9.22e-09  6.14e-09  5.89e-08  6.21e-08   erg/cm2
      90%_error_low -5.34e-09 -5.56e-09 -4.68e-09 -4.28e-09 -1.37e-08 -1.58e-08   erg/cm2
      90%_error_hi   5.33e-09  5.34e-09  6.17e-09  9.13e-09  1.50e-08  1.95e-08   erg/cm2
Peak flux       PL   2.78e-01  1.49e-01  4.96e-02  2.14e-02  4.89e-01  4.98e-01   ph/cm2/s
      90%_error_low -8.61e-02 -4.92e-02 -2.84e-02 -2.14e-02 -1.30e-01 -1.34e-01   ph/cm2/s
      90%_error_hi   8.78e-02  4.59e-02  3.46e-02  3.46e-02  1.30e-01  1.35e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -5.34e-09 -5.56e-09 -4.68e-09 -4.28e-09 -1.37e-08 -1.58e-08   erg/cm2
      90%_error_hi   5.33e-09  5.34e-09  6.17e-09  9.13e-09  1.50e-08  1.95e-08   erg/cm2
Peak flux      CPL   2.68e-01  1.66e-01  4.30e-02  4.96e-03  4.82e-01  4.83e-01   ph/cm2/s
      90%_error_low -9.91e-02     N/A   -4.30e-02     N/A   -1.27e-01 -1.28e-01   ph/cm2/s
      90%_error_hi   9.14e-02     N/A    3.85e-02     N/A    1.28e-01  1.30e-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
  280.1939   -54.9656   0.0209    17.3684  -157.9874         0.1762445      9.260 TRIG_00312047                 
 
Foreground time interval of the image:
 -0.312   3.324 (delta_t =   3.636 [sec])
Background time interval of the image:
-137.283  -0.312 (delta_t = 136.971 [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   -0.312 sec. to    3.324 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -3.08025     ( -0.576709   0.462925 )
Norm@50keV  : 1.29706E-03    ( -0.000546091   0.000603509 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.79 using 59 PHA bins.
# Reduced chi-squared =         0.9787 for     57 degrees of freedom 
# Null hypothesis probability =   5.206201e-01
 
Photon flux (15-150 keV)    in 3.636 sec: 0.378455 ( -0.068874  0.069039 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.88781e-08 ( -1.37046e-08  1.49657e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.312 sec. to    3.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.89867     (       )
Epeak [keV] : 2.64293      (   )
Norm@50keV  : 8.40983E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.34 using 59 PHA bins.
# Reduced chi-squared =         0.9883 for     56 degrees of freedom 
# Null hypothesis probability =   4.997171e-01
 
Photon flux (15-150 keV)    in 3.636 sec: 0.373280 ( -0.06704  0.067658 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.020 sec. to    1.020 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.58555     ( -0.724471   0.549233 )
Norm@50keV  : 2.35728E-03    ( -0.00114645   0.00116333 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.94 using 59 PHA bins.
# Reduced chi-squared =         0.7885 for     57 degrees of freedom 
# Null hypothesis probability =   8.763171e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.488534 ( -0.129525  0.129728 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.41624e-08 ( -8.12552e-09  8.97359e-09 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.020 sec. to    1.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.58752     (       )
Epeak [keV] : 14.5340      (   )
Norm@50keV  : 1.03448E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.48 using 59 PHA bins.
# Reduced chi-squared =         0.7942 for     56 degrees of freedom 
# Null hypothesis probability =   8.664366e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.481563 ( -0.127371  0.128248 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) 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 = -2.899739492053793E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -137.283380 -0.312000

# RAcent #  [deg] 170.0594 -60.6004 186.6473 -62.7730 244.9642 -15.6390 255.9613 -37.8288 256.5744 -36.2533 263.0089 -24.8160 264.7005 -44.3055 270.2276 -25.2374 270.4276 -25.7773 274.0165 -14.0467 275.9846 -30.4229 284.9517 -25.0294 263.0445 -33.8607 266.7964 -27.3604 251.5722 -45.6524 243.3505 -52.3279 341.8266 -52.6094

Pre-slew

 Time interval of the image: -0.312000 3.324000

# RAcent #  [deg] 170.3308 -60.7754 186.2639 -62.7482 245.1041 -15.6964 255.9539 -37.6973 256.6117 -36.3990 262.8124 -24.6318 264.6576 -44.5943 270.2769 -25.1608 270.5152 -25.8331 273.9602 -14.0591 275.9827 -30.4947 284.9502 -24.9249 262.8503 -33.9465 280.1939 -54.9656

Post-slew

 Time interval of the image: 82.116590 962.486400

# RAcent #  [deg] 170.4328 -60.5498 186.6871 -62.7556 255.9918 -37.8298 256.3870 -36.2578 263.0802 -24.7497 264.8270 -44.3086 270.2873 -25.0989 270.3414 -25.7095 274.1148 -14.1121 275.9306 -30.3142 284.9678 -24.8675 262.9393 -33.9133 266.8442 -27.3440 243.1221 -52.4431 104.8595 -68.6684 335.1282 -23.6205

IMY = 1.172313939840287E-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] ['] 7.1 41.2 -36.7 0.3821 1.6 7.7 Cen X-3 1.0 33.1 -35.4 2.0772 11.7 0.3 GX 301-2 1.0 38.4 87.9 6.4644 11.6 0.9 Sco X-1 0.9 16.5 112.2 1.8060 12.5 1.5 4U 1700-377 0.0 18.1 112.7 0.3256 2.1 12.2 GX 349+2 10.8 30.5 119.3 -0.2255 -1.1 4.2 GX 1+4 4.6 13.4 146.7 0.3465 2.5 8.9 4U 1735-44 6.3 32.2 131.5 -0.4133 -1.8 10.0 GX 5-1 7.1 31.8 132.2 0.3641 1.6 7.1 GRS 1758-258 7.9 43.9 130.4 0.9572 1.5 0.9 GX 17+2 150.0 29.9 144.9 -0.0158 -0.1 4.6 H1820-303 8.1 38.6 151.8 -0.3726 -1.4 8.0 HT1900.1-2455 4.1 21.9 125.6 0.4668 2.8 3.2 GX 354-0 1.3 29.1 127.4 1.7664 9.1 ------ UNKNOWN 3.1 8.2 102.7 0.4900 3.7 ------ UNKNOWN 2.3 4.4 22.9 0.6647 5.0 ------ UNKNOWN 3.5 50.9 -135.5 3.0309 3.4 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 14.8 41.0 -36.9 -0.0241 -0.8 9.2 Cen X-3 0.0 33.3 -35.4 -0.0157 -0.6 10.9 GX 301-2 7.5 38.3 88.1 0.1153 1.5 8.0 Sco X-1 4.1 16.6 112.1 -0.0567 -2.8 8.9 4U 1700-377 4.9 18.0 112.9 0.0499 2.4 8.6 GX 349+2 0.0 30.7 118.9 -0.0088 -0.3 12.7 GX 1+4 5.6 13.1 147.4 -0.0411 -2.1 9.4 4U 1735-44 3.2 32.3 131.5 0.1122 3.6 4.9 GX 5-1 2.9 31.8 132.4 -0.1171 -4.0 12.7 GRS 1758-258 113.2 43.9 130.3 0.0078 0.1 3.0 GX 17+2 8.3 29.8 144.9 -0.0380 -1.4 8.2 H1820-303 5.2 38.7 151.7 0.0832 2.2 4.7 HT1900.1-2455 10.2 21.8 125.3 0.0260 1.1 9.6 GX 354-0 1.3 17.4 -158.0 0.1763 9.3 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 12.2 51.8 5.6 1.5020 0.9 5.6 Cen X-3 1.3 44.6 10.2 8.6469 9.1 1.2 GX 301-2 1.0 23.7 96.0 8.6267 12.1 0.9 4U 1700-377 6.6 24.8 98.8 1.3195 1.8 10.2 GX 349+2 16.3 32.8 120.0 0.6986 0.7 3.9 GX 1+4 6.0 14.6 100.6 0.8990 1.9 9.2 4U 1735-44 3.6 30.8 131.9 2.8435 3.2 1.2 GX 5-1 3.7 30.2 131.7 2.7124 3.1 2.9 GRS 1758-258 3.9 41.2 140.6 4.7550 3.0 7.8 GX 17+2 3.4 24.9 140.8 2.3664 3.4 3.2 H1820-303 4.6 30.4 158.2 2.0271 2.5 4.9 HT1900.1-2455 4.4 24.3 112.8 1.8746 2.6 5.3 GX 354-0 0.7 29.3 124.8 12.5741 15.9 ------ UNKNOWN 1.7 21.8 50.9 3.8602 6.6 ------ UNKNOWN 5.5 56.3 -28.4 8.2311 2.1 ------ UNKNOWN 4.1 50.9 -135.5 14.0825 2.8 ------ 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