batgrbproduct Analysis for Trigger=230504
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 2 04:59:48 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger230504/GCN5_download_cron
======================================================================
Trigger: 00230504 Segment: 000
BAT Trigger Time: 180599088 [s; MET]
Trigger Stop: 180600016 [s; MET]
UTC: 2006-09-22T06:24:46.540320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 267.401920766903 Dec: -28.3395791148594 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.21
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.21
Flight Position: [ source = BAT ]
RA: 267.401920766903 Dec: -28.3395791148594 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 267.374198247725 Dec: -28.3389830074973 [deg; J2000]
{ 17h 49m 29.8s , -28d 20' 20.3" }
+/- 2.76788277702994 [arcmin] (estimated 90% radius based on SNR)
+/- 1.58724094828991 [arcmin] (formal 1-sigma fit error)
SNR: 7.10360522676329
RA = 17h 49m 29.8s (267.374198 deg.)
Dec = -28d 20' 20" (-28.338983 deg.)
Angular difference between Flight and Ground position is 1.464439 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 928 +/-
Measured from: 0
to: 928 [s; relative to TRIGTIME]
T50: 928 +/-
Measured from: 0
to: 928 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 928 second)
Measured from: 0
to: 928 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 928 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.281900 1.334581 0.946785 0.220637
0.179766 0.163264 0.136924 0.116063 [error]
Peak 1.281900 1.334581 0.946785 0.220637
0.179766 0.163264 0.136924 0.116063 [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 3.79e-07 5.85e-07 6.80e-07 1.52e-06 2.09e-06 3.17e-06 erg/cm2
Error 7.88e-08 7.74e-08 1.34e-07 6.23e-07 3.14e-07 7.45e-07 erg/cm2
Peak flux Power-law 1.32e-02 1.13e-02 6.54e-03 5.66e-03 3.35e-02 3.67e-02 ph/cm2/s
Error 2.81e-03 1.51e-03 1.24e-03 2.15e-03 4.49e-03 4.83e-03 ph/cm2/s
Fluence Cutoff-PL 3.52e-07 6.20e-07 6.94e-07 7.21e-07 2.01e-06 2.39e-06 erg/cm2
Error 9.14e-08 9.71e-08 1.47e-07 9.14e-07 3.36e-07 1.00e-06 erg/cm2
Peak flux Cutoff-PL 1.22e-02 1.19e-02 6.74e-03 3.17e-03 3.28e-02 3.40e-02 ph/cm2/s
Error 3.26e-03 1.84e-03 1.38e-03 3.74e-03 4.66e-03 5.75e-03 ph/cm2/s
Fluence Band 3.49e-07 6.17e-07 6.92e-07 7.20e-07 2.01e-06 2.34e-06 erg/cm2
Error 9.07e-08 9.71e-08 1.47e-07 9.18e-07 3.36e-07 1.00e-06 erg/cm2
Peak flux Band 1.22e-02 1.19e-02 6.74e-03 3.18e-03 3.28e-02 3.40e-02 ph/cm2/s
Error 3.30e-03 1.84e-03 1.38e-03 3.74e-03 4.67e-03 5.86e-03 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.784 0.241 - - 2.45e-04 3.56e-05 46.248 57
CPL 1.162 0.875 64.2 5000.0 5.18e-04 7.82e-04 45.248 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.784 0.241 - - 2.45e-04 3.56e-05 46.248 57
CPL 1.162 0.875 64.2 5000.0 5.18e-04 7.82e-04 45.248 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 928.000 0.000 928.000
T90 928.000 0.000 928.000
T50 928.000 0.000 928.000
Peak 928.000 0.000 928.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
267.3742 -28.3390 0.0270 23.8 -9.4 4.1484 7.1 TRIG_00230504
------------------------------------------
Foreground time interval of the image:
0.000 928.000 (delta_t = 928.000 [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 928.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78422 ( -0.236508 0.245429 )
Norm@50keV : 2.445222E-04 ( -3.601475E-05 3.527332E-05) )
------------------------------------------------------------
Chi-Squared = 46.24762 using 59 PHA bins.
Reduced chi-squared = 0.8113618 for 57 degrees of freedom
Null hypothesis probability = 0.845
Photon flux (15-150 keV) in 928.0 sec: 3.348993E-02 ( -0.00448854 0.00449758 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09054e-06 ( -3.114e-07 3.15956e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 928.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16182 ( -0.933717 0.815624 )
Epeak [keV] : 64.1528 ( -64.1428 9935.85 )
Norm@50keV : 5.183657E-04 ( -5.183657E-04 1.045454E-03) )
------------------------------------------------------------
Chi-Squared = 45.24836 using 59 PHA bins.
Reduced chi-squared = 0.8080063 for 56 degrees of freedom
Null hypothesis probability = 0.847
Photon flux (15-150 keV) in 928.0 sec: 3.275224E-02 ( -0.00465848 0.00466111 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01459e-06 ( -3.32493e-07 3.3923e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 928.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21773 ( -8.78227 0.977976 )
beta : -9.27480 ( -0.725202 7.67678 )
Epeak [keV] : 65.7833 ( -22.9384 9934.22 )
Norm@50keV : 4.849135E-04 ( -4.849135E-04 1.069404E-03) )
------------------------------------------------------------
Chi-Squared = 45.22042 using 59 PHA bins.
Reduced chi-squared = 0.8221895 for 55 degrees of freedom
Null hypothesis probability = 0.824
Photon flux (15-150 keV) in 928.0 sec: 3.275606E-02 ( -0.00467305 0.00465803 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01237e-06 ( -3.32066e-07 3.40186e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 928.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78422 ( -0.236508 0.245429 )
Norm@50keV : 2.445222E-04 ( -3.601475E-05 3.527332E-05) )
------------------------------------------------------------
Chi-Squared = 46.24762 using 59 PHA bins.
Reduced chi-squared = 0.8113618 for 57 degrees of freedom
Null hypothesis probability = 0.845
Photon flux (15-150 keV) in 928.0 sec: 3.348993E-02 ( -0.00448854 0.00449758 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09054e-06 ( -3.114e-07 3.15956e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 928.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16182 ( -0.933717 0.815624 )
Epeak [keV] : 64.1528 ( -64.1428 9935.85 )
Norm@50keV : 5.183657E-04 ( -5.183657E-04 1.045454E-03) )
------------------------------------------------------------
Chi-Squared = 45.24836 using 59 PHA bins.
Reduced chi-squared = 0.8080063 for 56 degrees of freedom
Null hypothesis probability = 0.847
Photon flux (15-150 keV) in 928.0 sec: 3.275224E-02 ( -0.00465848 0.00466111 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01459e-06 ( -3.32493e-07 3.3923e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 928.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21773 ( -8.78227 0.977976 )
beta : -9.27480 ( -0.725202 7.67716 )
Epeak [keV] : 65.7833 ( -22.9384 9934.22 )
Norm@50keV : 4.849135E-04 ( -4.849135E-04 1.069404E-03) )
------------------------------------------------------------
Chi-Squared = 45.22042 using 59 PHA bins.
Reduced chi-squared = 0.8221895 for 55 degrees of freedom
Null hypothesis probability = 0.824
Photon flux (15-150 keV) in 928.0 sec: 3.275606E-02 ( -0.00467305 0.00465803 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01237e-06 ( -3.32066e-07 3.40186e-07 ) ergs/cm2
Plot creation:
Wed Jan 2 05:15:09 EST 2008