batgrbproduct Analysis for Trigger=172969
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): Wed Jan 9 19:59:08 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger172969/GCN5_download_cron
======================================================================
Trigger: 00172969 Segment: 000
BAT Trigger Time: 156424912 [s; MET]
Trigger Stop: 156424976 [s; MET]
UTC: 2005-12-16T11:21:52.100720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 358.776411329565 Dec: 28.6072602119427 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33481
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33481
Flight Position: [ source = BAT ]
RA: 358.776411329565 Dec: 28.6072602119427 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 358.798332860005 Dec: 28.6073738380072 [deg; J2000]
{ 23h 55m 11.6s , +28d 36' 26.5" }
+/- 3.27153034770853 [arcmin] (estimated 90% radius based on SNR)
+/- 1.89282198522829 [arcmin] (formal 1-sigma fit error)
SNR: 5.59448192797011
RA = 23h 55m 11.6s (358.798333 deg.)
Dec = 28d 36' 27" (28.607374 deg.)
Angular difference between Flight and Ground position is 1.154744 arcmin
Partial Coding Fraction: 0.796875 [ 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 0.292169 0.162880 0.021777 -0.044089
0.041811 0.042283 0.037624 0.035682 [error]
Peak 0.292169 0.162880 0.021777 -0.044089
0.041811 0.042283 0.037624 0.035682 [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 8.61e-08 7.18e-08 4.07e-08 3.42e-08 2.14e-07 2.32e-07 erg/cm2
Error 2.15e-08 2.35e-08 2.79e-08 4.97e-08 6.83e-08 9.41e-08 erg/cm2
Peak flux Power-law 4.46e-02 2.09e-02 5.91e-03 2.10e-03 7.26e-02 7.35e-02 ph/cm2/s
Error 1.14e-02 6.50e-03 3.92e-03 2.86e-03 1.65e-02 1.70e-02 ph/cm2/s
Fluence Cutoff-PL 8.61e-08 7.18e-08 4.06e-08 3.38e-08 2.14e-07 2.32e-07 erg/cm2
Error 2.15e-08 2.35e-08 2.79e-08 4.93e-08 6.82e-08 9.37e-08 erg/cm2
Peak flux Cutoff-PL 4.46e-02 2.09e-02 5.90e-03 2.08e-03 7.26e-02 7.34e-02 ph/cm2/s
Error 1.14e-02 6.51e-03 3.92e-03 2.84e-03 1.65e-02 1.70e-02 ph/cm2/s
Fluence Band 8.96e-08 7.06e-08 3.47e-08 2.42e-08 2.07e-07 2.24e-07 erg/cm2
Error 2.37e-08 2.27e-08 1.83e-08 8.95e-09 5.07e-08 5.82e-08 erg/cm2
Peak flux Band 4.46e-02 2.08e-02 5.86e-03 2.07e-03 7.26e-02 7.55e-02 ph/cm2/s
Error 1.07e-02 5.15e-03 2.63e-03 1.35e-03 1.65e-02 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.819 0.630 - - 3.00e-04 1.53e-04 46.808 57
CPL 1.754 0.000 6.6 0.0 1.73e-03 1.29e-03 47.352 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.819 0.630 - - 3.00e-04 1.53e-04 46.808 57
CPL 1.754 0.000 6.6 0.0 1.73e-03 1.29e-03 47.352 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
358.7983 +28.6074 0.0342 28.1 168.2 0.4786 5.6 TRIG_00172969
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.81902 ( -0.553301 0.705809 )
Norm@50keV : 3.000698E-04 ( -1.460669E-04 1.592841E-04) )
------------------------------------------------------------
Chi-Squared = 46.80799 using 59 PHA bins.
Reduced chi-squared = 0.8211928 for 57 degrees of freedom
Null hypothesis probability = 0.830
Photon flux (15-150 keV) in 64.00 sec: 7.258443E-02 ( -0.0164964 0.016552 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13579e-07 ( -6.4128e-08 7.24006e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75420 ( )
Epeak [keV] : 6.56461 ( )
Norm@50keV : 1.729504E-03 ( -1.219315E-03 1.365414E-03) )
------------------------------------------------------------
Chi-Squared = 47.35204 using 59 PHA bins.
Reduced chi-squared = 0.8455721 for 56 degrees of freedom
Null hypothesis probability = 0.788
Photon flux (15-150 keV) in 64.00 sec: 7.255354E-02 ( -0.016491 0.0165464 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13585e-07 ( -6.41626e-08 7.23181e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.66522 ( -2.48725 12.5127 )
beta : -8.26781 ( -0.706694 12.8189 )
Epeak [keV] : 9.50838 ( -9.40838 9990.49 )
Norm@50keV : 1.750907E-03 ( -1.983528E-02 2.165350E-02) )
------------------------------------------------------------
Chi-Squared = 47.52003 using 59 PHA bins.
Reduced chi-squared = 0.8640006 for 55 degrees of freedom
Null hypothesis probability = 0.753
Photon flux (15-150 keV) in 64.00 sec: 7.256387E-02 ( -0.0164642 0.0165553 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07052e-07 ( -5.24045e-08 4.90784e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.81902 ( -0.553301 0.705809 )
Norm@50keV : 3.000698E-04 ( -1.460669E-04 1.592841E-04) )
------------------------------------------------------------
Chi-Squared = 46.80799 using 59 PHA bins.
Reduced chi-squared = 0.8211928 for 57 degrees of freedom
Null hypothesis probability = 0.830
Photon flux (15-150 keV) in 64.00 sec: 7.258443E-02 ( -0.0164964 0.016552 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13579e-07 ( -6.4128e-08 7.24006e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75420 ( )
Epeak [keV] : 6.56461 ( )
Norm@50keV : 1.729504E-03 ( -1.220949E-03 1.355540E-03) )
------------------------------------------------------------
Chi-Squared = 47.35204 using 59 PHA bins.
Reduced chi-squared = 0.8455721 for 56 degrees of freedom
Null hypothesis probability = 0.788
Photon flux (15-150 keV) in 64.00 sec: 7.255354E-02 ( -0.016491 0.0165464 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13585e-07 ( -6.41626e-08 7.23181e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.66522 ( -2.48725 12.5127 )
beta : -8.26781 ( -0.706694 12.8189 )
Epeak [keV] : 9.50838 ( -9.40838 9990.49 )
Norm@50keV : 1.750907E-03 ( -1.983528E-02 2.165350E-02) )
------------------------------------------------------------
Chi-Squared = 47.52003 using 59 PHA bins.
Reduced chi-squared = 0.8640006 for 55 degrees of freedom
Null hypothesis probability = 0.753
Photon flux (15-150 keV) in 64.00 sec: 7.256387E-02 ( -0.0164642 0.0165553 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07052e-07 ( -5.24045e-08 4.90784e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 20:10:49 EST 2008