batgrbproduct Analysis for Trigger=118087
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.41
Process Start Time (local time): Sat Jan 5 01:49:05 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger118087/GCN5_download_cron
======================================================================
Trigger: 00118087 Segment: 000
BAT Trigger Time: 137165632 [s; MET]
Trigger Stop: 137165696 [s; MET]
UTC: 2005-05-07T13:33:52.488280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 128.463418117485 Dec: 51.099224908698 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5
Flight Position: [ source = BAT ]
RA: 128.463418117485 Dec: 51.099224908698 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 128.407803671569 Dec: 51.0865008931664 [deg; J2000]
{ 08h 33m 37.9s , +51d 05' 11.4" }
+/- 6.47177774267751 [arcmin] (estimated 90% radius based on SNR)
+/- 6.17389567899797 [arcmin] (formal 1-sigma fit error)
SNR: 2.111121582099
RA = 8h 33m 37.9s (128.407804 deg.)
Dec = 51d 5' 11" (51.086501 deg.)
Angular difference between Flight and Ground position is 2.230475 arcmin
Partial Coding Fraction: 0.859375 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.108589 0.073394 -0.032423 -0.022011
0.027051 0.027789 0.025507 0.024632 [error]
Peak 0.108589 0.073394 -0.032423 -0.022011
0.027051 0.027789 0.025507 0.024632 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== 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 Power-law 2.61e-08 2.30e-08 1.39e-08 1.27e-08 6.85e-08 7.57e-08 erg/cm2
Error 1.18e-08 1.28e-08 1.40e-08 2.73e-08 3.82e-08 5.37e-08 erg/cm2
Peak flux Power-law 2.60e-02 1.27e-02 3.90e-03 1.50e-03 4.39e-02 4.40e-02 ph/cm2/s
Error 1.20e-02 6.97e-03 4.29e-03 2.95e-03 1.97e-02 2.04e-02 ph/cm2/s
Fluence Cutoff-PL 2.94e-08 3.38e-08 3.12e-09 3.95e-12 6.64e-08 6.63e-08 erg/cm2
Error 1.02e-08 1.62e-08 6.69e-09 4.23e-10 2.68e-08 2.64e-08 erg/cm2
Peak flux Cutoff-PL 2.88e-02 1.93e-02 9.63e-04 5.89e-07 4.90e-02 4.89e-02 ph/cm2/s
Error 1.29e-02 8.71e-03 2.05e-03 6.93e-05 1.82e-02 1.83e-02 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.729 0.914 - - 1.93e-04 1.79e-04 59.545 57
CPL -2.496 0.000 25.5 6.7 9.63e-01 4.26e+00 54.218 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.729 0.914 - - 1.93e-04 1.79e-04 59.545 57
CPL -2.496 0.000 25.5 6.7 9.63e-01 4.26e+00 54.218 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
128.4078 +51.0865 0.0908 23.1 -40.2 0.1117 2.1 TRIG_00118087
------------------------------------------
Foreground time interval of the image:
0.000 33.018 (delta_t = 33.018 [sec])
Background time interval of the image:
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 5) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of 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 pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.018 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.72947 ( -0.770484 1.05658 )
Norm@50keV : 1.925761E-04 ( -1.925761E-04 1.654019E-04) )
------------------------------------------------------------
Chi-Squared = 59.54526 using 59 PHA bins.
Reduced chi-squared = 1.044654 for 57 degrees of freedom
Null hypothesis probability = 0.383
Photon flux (15-150 keV) in 33.02 sec: 4.385145E-02 ( -0.0195345 0.0198693 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.84515e-08 ( -3.35014e-08 4.29541e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.018 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49625 ( )
Epeak [keV] : 25.4604 ( -6.28829 7.15070 )
Norm@50keV : 0.963044 ( -2.07278 6.45309 )
------------------------------------------------------------
Chi-Squared = 54.21835 using 59 PHA bins.
Reduced chi-squared = 0.9681848 for 56 degrees of freedom
Null hypothesis probability = 0.543
Photon flux (15-150 keV) in 33.02 sec: 4.898584E-02 ( -0.0182298 0.0182344 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.63907e-08 ( -2.60983e-08 2.75625e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.018 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.41883 ( -5.48016 7.927084E-02) )
beta : -8.84588 ( )
Epeak [keV] : 12.6607 ( )
Norm@50keV : 1.800430E-03 ( )
------------------------------------------------------------
Chi-Squared = 57.36804 using 59 PHA bins.
Reduced chi-squared = 1.043055 for 55 degrees of freedom
Null hypothesis probability = 0.387
Photon flux (15-150 keV) in 33.02 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.018 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.72947 ( -0.770484 1.05658 )
Norm@50keV : 1.925761E-04 ( -1.925761E-04 1.654019E-04) )
------------------------------------------------------------
Chi-Squared = 59.54526 using 59 PHA bins.
Reduced chi-squared = 1.044654 for 57 degrees of freedom
Null hypothesis probability = 0.383
Photon flux (15-150 keV) in 33.02 sec: 4.385145E-02 ( -0.0195345 0.0198693 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.84515e-08 ( -3.35014e-08 4.29541e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.018 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49625 ( )
Epeak [keV] : 25.4604 ( -6.28829 7.15070 )
Norm@50keV : 0.963044 ( -2.07278 6.45309 )
------------------------------------------------------------
Chi-Squared = 54.21835 using 59 PHA bins.
Reduced chi-squared = 0.9681848 for 56 degrees of freedom
Null hypothesis probability = 0.543
Photon flux (15-150 keV) in 33.02 sec: 4.898584E-02 ( -0.0182298 0.0182344 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.63907e-08 ( -2.60983e-08 2.75625e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.018 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.41883 ( -5.48016 7.927084E-02) )
beta : -8.84588 ( )
Epeak [keV] : 12.6607 ( )
Norm@50keV : 1.800430E-03 ( )
------------------------------------------------------------
Chi-Squared = 57.36804 using 59 PHA bins.
Reduced chi-squared = 1.043055 for 55 degrees of freedom
Null hypothesis probability = 0.387
Photon flux (15-150 keV) in 33.02 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sat Jan 5 02:04:27 EST 2008