GRB080710

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 00:27:14 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger316534
======================================================================

  Trigger: 00316534      Segment: 000

  BAT Trigger Time: 237366793.728   [s; MET]
      Trigger Stop: 237366797.824   [s; MET]
               UTC: 2008-07-10T07:13:10.798420    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 8.25709402209318   Dec: 19.4919117249144  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.57
     Image Trigger?:     NO
     Rate S/N Ratio:     12  [ if not an image trigger ]
     Image S/N Ratio:    8.57

  Analysis Position:   [ source = BAT ]
    RA: 8.25709402209318   Dec: 19.4919117249144  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 8.25764258624305   Dec: 19.4700647446021  [deg; J2000]  
        { 00h 33m 01.8s , +19d 28' 12.2" }
         +/- 2.30833434785602 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.43177465483584 [arcmin] (formal 1-sigma fit error)
    SNR: 9.20704397153118
 
  Angular difference between the analysis and refined position is 1.311186 arcmin
 
  Partial Coding Fraction: 0.484375    [ including projection effects ]

  Duration
     T90: 142.988000005484 +/- 25.1402219599534
        Measured from: -90.619999974966
                   to: 52.3680000305176     [s; relative to TRIGTIME]
     T50: 70.4720000326633 +/- 14.7374149738363
        Measured from: -58.6319999992847
                   to: 11.8400000333786     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.888000011444092     
                   to: 1.88800001144409     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -96.2159999907017     
                   to: 66.5480000078678     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.674046   0.830969   0.688983   0.215894
           0.092054   0.097569   0.091387   0.092521 [error]
 Peak      0.036816   0.047055   0.027189   0.007897
           0.007625   0.008238   0.007636   0.007564 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  162.764  -96.216   66.548
T90   142.988  -90.620   52.368
T50    70.472  -58.632   11.840
Peak    1.000    0.888    1.888
 
 
====== 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      -1.448    -0.229      0.226       -           -               -         9.80e-04     -1.23e-04          1.22e-04      62.610   57
CPL     -1.450    -0.226      0.589     9999.360    -9999.360      -9999.360      9.82e-04     -9.82e-04          -5.24e-04      62.620   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      -1.843     -0.384     0.354       -           -               -         6.58e-03     -1.73e-03          1.69e-03      67.710   57
CPL     -0.474     -1.655     5.490       41.305      N/A           N/A         4.71e-02        N/A               N/A         65.930   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   1.94e-07  3.68e-07  5.40e-07  1.69e-06  1.53e-06  2.79e-06   erg/cm2
      90%_error_low -3.97e-08 -4.59e-08 -9.19e-08 -5.53e-07 -2.17e-07 -6.34e-07   erg/cm2
      90%_error_hi   4.18e-08  4.54e-08  9.12e-08  7.19e-07  2.21e-07  7.74e-07   erg/cm2
Peak flux       PL   3.77e-01  3.10e-01  1.73e-01  1.42e-01  9.22e-01  1.00e+00   ph/cm2/s
      90%_error_low -1.04e-01 -6.45e-02 -5.70e-02 -7.25e-02 -1.91e-01 -2.15e-01   ph/cm2/s
      90%_error_hi   1.08e-01  6.44e-02  5.97e-02  1.09e-01  1.91e-01  2.19e-01   ph/cm2/s
 
Fluence        CPL   1.97e-07  3.63e-07  5.36e-07  1.83e-06  1.54e-06  2.70e-06   erg/cm2
      90%_error_low -5.14e-08 -5.18e-08 -1.06e-07 -1.17e-06 -2.75e-07 -9.77e-07   erg/cm2
      90%_error_hi   4.67e-08  6.52e-08  1.12e-07  1.96e-07  2.54e-07  8.40e-07   erg/cm2
Peak flux      CPL   3.54e-01  3.63e-01  1.48e-01  2.06e-02  8.84e-01  8.87e-01   ph/cm2/s
      90%_error_low -1.13e-01 -9.67e-02 -1.48e-01 -2.06e-02 -1.95e-01 -1.97e-01   ph/cm2/s
      90%_error_hi   1.15e-01  1.16e-01  7.80e-02  1.53e-01  1.96e-01  2.40e-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
    8.2576    19.4701   0.0210    25.6600    85.0457         2.4665149      9.207 TRIG_00316534                 
 
Foreground time interval of the image:
-96.216  66.548 (delta_t = 162.764 [sec])
Background time interval of the image:
-239.728 -96.216 (delta_t = 143.512 [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  -96.216 sec. to   66.548 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.44785     ( -0.229321   0.226238 )
Norm@50keV  : 9.80042E-04    ( -0.00012326   0.000121684 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.61 using 59 PHA bins.
# Reduced chi-squared =          1.098 for     57 degrees of freedom 
# Null hypothesis probability =   2.841058e-01
 
Photon flux (15-150 keV)    in 162.8 sec: 0.120715 ( -0.014493  0.014515 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.52758e-06 ( -2.16576e-07  2.20591e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -96.216 sec. to   66.548 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.83881     ( -0.22587   0.588665 )
Epeak [keV] : 252.088      ( -9999.36 -9999.36 )
Norm@50keV  : 1.86407E-04    ( -0.000187754   0.000270202 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.35 using 59 PHA bins.
# Reduced chi-squared =          1.096 for     56 degrees of freedom 
# Null hypothesis probability =   2.901700e-01
 
Photon flux (15-150 keV)    in 162.8 sec: 0.120702 ( -0.014503  0.014506 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.53906e-06 ( -2.74976e-07  2.54373e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.888 sec. to    1.888 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.84278     ( -0.384311   0.353935 )
Norm@50keV  : 6.57776E-03    ( -0.00173463   0.00168482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.71 using 59 PHA bins.
# Reduced chi-squared =          1.188 for     57 degrees of freedom 
# Null hypothesis probability =   1.567148e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.921926 ( -0.191267  0.191324 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.05006e-08 ( -1.54573e-08  1.63063e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.888 sec. to    1.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.473571     ( -1.65558   5.48893 )
Epeak [keV] : 41.3053      (   )
Norm@50keV  : 4.71133E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.93 using 59 PHA bins.
# Reduced chi-squared =          1.177 for     56 degrees of freedom 
# Null hypothesis probability =   1.711307e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.884061 ( -0.194507  0.196339 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.05778e-08 ( -1.70303e-08  2.03032e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 142.988 sec.
Hardness ratio (energy fluence ratio) = 1.46632418292

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

S(15-50 keV)  = 5.62071e-07
S(50-150 keV) = 9.655181e-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 = 4.148834867826598E-02, IMY = -4.786129414824871E-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:
-239.728000 -96.216000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
316.7616  82.0426    3.2  55.3 -168.3   1.6493   3.7 ------	UNKNOWN                       
326.5259  83.5243    2.7  54.5 -166.2   1.8543   4.2 ------	UNKNOWN                       
284.5800  83.5486    2.9  59.1 -166.1   3.5918   3.9 ------	UNKNOWN

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

Time interval of the image:
-96.216000 66.548000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
  8.2576  19.4701    1.3  25.7   85.0   2.4642   9.2 ------	UNKNOWN                       
105.8565  81.1773    2.4  54.8 -148.6   3.9830   4.9 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
289.772600 962.281600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6480 -40.4694    4.5  54.6 -165.6  -3.3917  -2.6    7.5	Vela X-1                      
181.8044 -35.9041    3.1  49.6  148.5   6.2771   3.7 ------	UNKNOWN                       
156.1128 -22.5913    2.8  32.1  178.6   1.6248   4.1 ------	UNKNOWN                       
133.4573   7.1635    2.6  26.5 -100.8   2.1513   4.4 ------	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 source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

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

Post-slew image of 15-350 keV band

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