GRB171010B: 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 GROUND-DETECTED GRB DATA PROCESSING REPORT                 
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Oct 11 13:10:39 EDT 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
======================================================================

  Trigger: 00778019      Segment: 000

  BAT Trigger Time: 529361984.0
               UTC: 2017-10-10T20:59:24.168   [includes UTCF correction]
       Where From?: Ground analysis (best_duration.txt)
  NOTE: BAT trigger time for ground-detected burst is the T100 start time.
 
  Analysis Position:   [ source = GCN ]
    RA: 34.1224   Dec: -54.4044  [deg; J2000]
 
  Refined Position:   [ source = BAT pre-slew image ]
    RA: 34.123266452   Dec: -54.4101842469  [deg; J2000]
        { 02h 16m 29.6s , -54d -24' -36.7" }
        +/- 1.58230542526 [arcmin] (estimated 90% radius based on SNR)
    SNR: 15.7933676234
 
 
  Angular difference between the analysis and refined position is 0.348371 arcmin
 
  Partial Coding Fraction: 0.7109375    [ including projection effects ]

  Duration
     T90: 30.4000000357628 +/- 1.6
        Measured from: 0
                   to: 30.4     [s; relative to TRIGTIME]
     T50: 17.6000000238419 +/- 1.6
        Measured from: 6.4
                   to: 24     [s; relative to TRIGTIME]
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   32.000    0.000   32.000
T90    30.400    0.000   30.400
T50    17.600    6.400   24.000
Peak    1.000    0.300    1.300
 
 
====== 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      -1.405    -0.176      0.175       -           -               -         4.02e-03     -4.18e-04          4.16e-04      52.390   57
CPL     -0.618    -0.758      0.932       88.237     -24.233       549.016      9.97e-03        N/A               N/A         49.240   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      N/A         N/A       N/A          -           -               -           N/A           N/A               N/A         N/A        N/A   
CPL     N/A         N/A       N/A          N/A         N/A           N/A           N/A           N/A               N/A         N/A        N/A   
 
 
=== 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   4.74e-08  9.24e-08  1.40e-07  4.57e-07  3.92e-07  7.36e-07   erg/cm2
      90%_error_low -7.99e-09 -9.83e-09 -1.87e-08 -1.19e-07 -4.54e-08 -1.35e-07   erg/cm2
      90%_error_hi   8.35e-09  9.77e-09  1.86e-08  1.44e-07  4.60e-08  1.56e-07   erg/cm2
Peak flux       PL     N/A      N/A      N/A      N/A      N/A      N/A     ph/cm2/s

Special notes of this burst

Image

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.

Best duration plot

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    1.000 sec. to   11.088 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.4052     ( -0.176344   0.17501 )
Norm@50keV  : 4.02355E-03    ( -0.000417721   0.000415744 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.39 using 59 PHA bins.
# Reduced chi-squared =         0.9191 for     57 degrees of freedom 
# Null hypothesis probability =   6.485389e-01
 
Photon flux (15-150 keV)    in 10.09 sec: 0.490583 ( -0.050104  0.050152 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.91915e-07 ( -4.54484e-08  4.60117e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    1.000 sec. to   11.088 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.617615     ( -0.757798   0.931877 )
Epeak [keV] : 88.2368      ( -24.2328 549.017 )
Norm@50keV  : 9.96570E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.24 using 59 PHA bins.
# Reduced chi-squared =         0.8793 for     56 degrees of freedom 
# Null hypothesis probability =   7.266063e-01
 
Photon flux (15-150 keV)    in 10.09 sec: 0.473018 ( -0.05344  0.053104 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.68495e-07 ( -5.00083e-08  5.11492e-08 ) ergs/cm2
 

1-s peak spectrum fit

1-s peak spectrum unavailable, likely because there are no event data in the 1-s peak range.

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 30.4 sec.
Hardness ratio (energy fluence ratio) = 1.51028842048

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

S(15-50 keV)  = 1.3980208e-07
S(50-150 keV) = 2.521133e-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.

Spacecraft aspect plot

Bright source in the event data image

Event data image of 15-350 keV band

Time interval of the image:
2.300000 11.088500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
264.7544 -44.4723   21.2  55.0  -33.4  -0.0905  -0.5    1.4	4U 1735-44                    
 34.1231 -54.4101    0.7  20.5  110.2   0.5802  15.8 ------	UNKNOWN                       
 86.1129 -42.6465    2.4  41.0  172.3   0.2632   4.8 ------	UNKNOWN                       
276.4958 -74.2664    3.2  25.4  -44.4   0.1337   3.6 ------	UNKNOWN                       

Webpage updated on:
Wed Oct 11 13:39:06 EDT 2017