batgrbproduct Analysis for Trigger=142667
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): Mon Jan 7 11:31:14 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger142667/GCN5_download_cron
======================================================================
Trigger: 00142667 Segment: 000
BAT Trigger Time: 141339808 [s; MET]
Trigger Stop: 141340288 [s; MET]
UTC: 2005-06-24T21:03:28.411260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 277.391204238094 Dec: -23.7964406142712 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33420
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33420
Flight Position: [ source = BAT ]
RA: 277.391204238094 Dec: -23.7964406142712 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 277.396285750482 Dec: -23.8329891074819 [deg; J2000]
{ 18h 29m 35.1s , -23d 49' 58.8" }
+/- 3.76358516287267 [arcmin] (estimated 90% radius based on SNR)
+/- 2.3322387446765 [arcmin] (formal 1-sigma fit error)
SNR: 4.57962765113223
RA = 18h 29m 35.1s (277.396286 deg.)
Dec = -23d 49' 59" (-23.832989 deg.)
Angular difference between Flight and Ground position is 2.210578 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 480 +/-
Measured from: 0
to: 480 [s; relative to TRIGTIME]
T50: 480 +/-
Measured from: 0
to: 480 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 480 second)
Measured from: 0
to: 480 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 480 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.105518 0.083631 0.010555 0.023841
0.027555 0.025808 0.021263 0.017537 [error]
Peak 0.105518 0.083631 0.010555 0.023841
0.027555 0.025808 0.021263 0.017537 [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 3.23e-08 2.86e-08 1.75e-08 1.61e-08 8.53e-08 9.51e-08 erg/cm2
Error 1.27e-08 1.42e-08 1.77e-08 3.71e-08 4.21e-08 6.42e-08 erg/cm2
Peak flux Power-law 3.23e-02 1.61e-02 4.90e-03 1.90e-03 5.44e-02 5.52e-02 ph/cm2/s
Error 1.31e-02 7.62e-03 5.25e-03 3.95e-03 1.84e-02 1.91e-02 ph/cm2/s
Fluence Cutoff-PL 3.23e-08 2.87e-08 1.75e-08 1.60e-08 8.53e-08 9.45e-08 erg/cm2
Error 1.27e-08 1.43e-08 1.77e-08 3.68e-08 4.21e-08 6.39e-08 erg/cm2
Peak flux Cutoff-PL 3.23e-02 1.61e-02 4.89e-03 1.88e-03 5.43e-02 5.51e-02 ph/cm2/s
Error 1.31e-02 7.62e-03 5.25e-03 3.92e-03 1.84e-02 1.91e-02 ph/cm2/s
Fluence Band 2.92e-08 2.88e-08 1.79e-08 1.69e-08 8.58e-08 1.31e-07 erg/cm2
Error 7.53e-09 1.06e-08 1.19e-08 4.23e-08 3.36e-08 0.00e+00 erg/cm2
Peak flux Band 3.17e-02 1.64e-02 5.19e-03 2.10e-03 5.52e-02 5.72e-02 ph/cm2/s
Error 9.54e-03 5.65e-03 3.46e-03 6.99e-03 1.81e-02 1.89e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.707 1.095 - - 2.42e-04 2.12e-04 71.773 57
CPL 1.761 1.773 9.5 0.0 9.17e-04 0.00e+00 72.591 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.707 1.095 - - 2.42e-04 2.12e-04 71.773 57
CPL 1.761 0.000 9.5 0.0 9.17e-04 0.00e+00 72.591 0
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 480.000 0.000 480.000
T90 480.000 0.000 480.000
T50 480.000 0.000 480.000
Peak 480.000 0.000 480.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
277.3963 -23.8330 0.0419 7.0 88.6 0.2294 4.6 TRIG_00142667
------------------------------------------
Foreground time interval of the image:
0.000 33.065 (delta_t = 33.065 [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 33.065 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.70669 ( -0.824254 1.36548 )
Norm@50keV : 2.419550E-04 ( -2.419550E-04 1.827142E-04) )
------------------------------------------------------------
Chi-Squared = 71.77261 using 59 PHA bins.
Reduced chi-squared = 1.259169 for 57 degrees of freedom
Null hypothesis probability = 9.002E-02
Photon flux (15-150 keV) in 33.06 sec: 5.435851E-02 ( -0.0184241 0.0184025 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.52968e-08 ( -3.89668e-08 4.52456e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.065 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76087 ( -2.73051 0.814761 )
Epeak [keV] : 9.45452 ( )
Norm@50keV : 9.170711E-04 ( )
------------------------------------------------------------
Chi-Squared = 72.59114 using 59 PHA bins.
Reduced chi-squared = 1.296270 for 56 degrees of freedom
Null hypothesis probability = 6.723E-02
Photon flux (15-150 keV) in 33.06 sec: 5.433358E-02 ( -0.0184186 0.0183965 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.52604e-08 ( -3.89764e-08 4.52548e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.065 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51235 ( -0.591516 14.4085 )
beta : -2.46259 ( -1.35955 0.829264 )
Epeak [keV] : 12.3958 ( -12.2958 9987.60 )
Norm@50keV : 1.505884E-03 ( -3.284757E-02 2.487411E-02) )
------------------------------------------------------------
Chi-Squared = 72.33156 using 59 PHA bins.
Reduced chi-squared = 1.315119 for 55 degrees of freedom
Null hypothesis probability = 5.853E-02
Photon flux (15-150 keV) in 33.06 sec: 5.517811E-02 ( -0.0187377 0.0173913 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.58234e-08 ( -3.86994e-08 2.84878e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.065 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.70669 ( -0.824254 1.36548 )
Norm@50keV : 2.419550E-04 ( -2.419550E-04 1.827142E-04) )
------------------------------------------------------------
Chi-Squared = 71.77261 using 59 PHA bins.
Reduced chi-squared = 1.259169 for 57 degrees of freedom
Null hypothesis probability = 9.002E-02
Photon flux (15-150 keV) in 33.06 sec: 5.435851E-02 ( -0.0184241 0.0184025 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.52968e-08 ( -3.89668e-08 4.52456e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.065 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76087 ( )
Epeak [keV] : 9.45452 ( )
Norm@50keV : 9.170711E-04 ( )
------------------------------------------------------------
Chi-Squared = 72.59114 using 59 PHA bins.
but latest trial -4.04566 gives Chi-Squared = 7.12823
Reduced chi-squared = 1.296270 for 56 degrees of freedom
Null hypothesis probability = 6.723E-02
Photon flux (15-150 keV) in 33.06 sec: 5.433358E-02 ( -0.0184186 0.0183965 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.52604e-08 ( -3.89764e-08 4.52548e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.065 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51235 ( -0.591516 14.4085 )
beta : -2.46259 ( -1.35955 0.829264 )
Epeak [keV] : 12.3958 ( -12.2958 9987.60 )
Norm@50keV : 1.505884E-03 ( -3.284757E-02 2.487411E-02) )
------------------------------------------------------------
Chi-Squared = 72.33156 using 59 PHA bins.
Reduced chi-squared = 1.315119 for 55 degrees of freedom
Null hypothesis probability = 5.853E-02
Photon flux (15-150 keV) in 33.06 sec: 5.517811E-02 ( -0.0187377 0.0173913 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.58234e-08 ( -3.86994e-08 2.84878e-08 ) ergs/cm2
Plot creation:
Mon Jan 7 11:35:38 EST 2008