batgrbproduct Analysis for Trigger=222425
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): Tue Jan 1 22:57:19 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger222425/GCN5_download_cron
======================================================================
Trigger: 00222425 Segment: 000
BAT Trigger Time: 176291488 [s; MET]
Trigger Stop: 176291552 [s; MET]
UTC: 2006-08-03T09:51:26.643000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 0.935572053766996 Dec: 8.35784168203159 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.84
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.84
Flight Position: [ source = BAT ]
RA: 0.935572053766996 Dec: 8.35784168203159 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 1.09128340466663 Dec: 8.29934599476687 [deg; J2000]
{ 00h 04m 21.9s , +08d 17' 57.6" }
+/- 4.66022139247657 [arcmin] (estimated 90% radius based on SNR)
+/- 3.49085152488033 [arcmin] (formal 1-sigma fit error)
SNR: 3.37482984585661
RA = 0h 4m 21.9s (1.091283 deg.)
Dec = 8d 17' 58" (8.299346 deg.)
Angular difference between Flight and Ground position is 9.888002 arcmin
Partial Coding Fraction: 0.8828125 [ 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 0.082148 0.095712 -0.024566 0.031152
0.027567 0.027903 0.024667 0.021693 [error]
Peak 0.082148 0.095712 -0.024566 0.031152
0.027567 0.027903 0.024667 0.021693 [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 2.64e-08 2.57e-08 1.75e-08 1.87e-08 7.72e-08 8.86e-08 erg/cm2
Error 1.20e-08 1.30e-08 1.80e-08 3.50e-08 4.14e-08 6.13e-08 erg/cm2
Peak flux Power-law 2.64e-02 1.43e-02 4.87e-03 2.15e-03 4.67e-02 4.78e-02 ph/cm2/s
Error 1.22e-02 7.00e-03 4.90e-03 3.71e-03 2.00e-02 2.08e-02 ph/cm2/s
Fluence Cutoff-PL 2.90e-08 3.84e-08 4.53e-09 9.33e-12 7.19e-08 7.20e-08 erg/cm2
Error 1.26e-08 1.78e-08 7.92e-09 4.22e-10 2.76e-08 2.76e-08 erg/cm2
Peak flux Cutoff-PL 2.85e-02 2.15e-02 1.36e-03 1.33e-06 5.13e-02 5.12e-02 ph/cm2/s
Error 1.25e-02 9.63e-03 2.43e-03 7.01e-05 1.83e-02 1.83e-02 ph/cm2/s
Fluence Band 2.62e-08 4.13e-08 3.55e-09 2.38e-11 7.23e-08 7.27e-08 erg/cm2
Error 1.22e-08 1.82e-08 3.19e-09 1.39e-09 2.73e-08 3.45e-08 erg/cm2
Peak flux Band 2.66e-02 2.02e-02 3.54e-03 8.55e-05 5.04e-02 5.04e-02 ph/cm2/s
Error 1.00e-02 7.76e-03 2.70e-03 1.29e-03 1.90e-02 1.90e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.537 0.838 - - 2.33e-04 1.98e-04 55.905 57
CPL -1.991 0.000 26.8 6.5 3.05e-01 2.31e+00 50.416 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.537 0.838 - - 2.33e-04 1.98e-04 55.905 57
CPL -1.991 0.000 26.8 6.5 3.05e-01 2.31e+00 50.416 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
1.0913 +8.2993 0.0567 26.6 -174.8 0.1712 3.4 TRIG_00222425
------------------------------------------
Foreground time interval of the image:
0.000 33.080 (delta_t = 33.080 [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 33.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.53691 ( -0.695111 0.980516 )
Norm@50keV : 2.330276E-04 ( -2.330276E-04 1.639201E-04) )
------------------------------------------------------------
Chi-Squared = 55.90500 using 59 PHA bins.
Reduced chi-squared = 0.9807894 for 57 degrees of freedom
Null hypothesis probability = 0.516
Photon flux (15-150 keV) in 33.08 sec: 4.674446E-02 ( -0.0199229 0.0200924 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.72392e-08 ( -3.79044e-08 4.49005e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.99097 ( )
Epeak [keV] : 26.8269 ( -5.97008 7.06005 )
Norm@50keV : 0.304802 ( -1.04467 3.56552 )
------------------------------------------------------------
Chi-Squared = 50.41637 using 59 PHA bins.
Reduced chi-squared = 0.9002923 for 56 degrees of freedom
Null hypothesis probability = 0.685
Photon flux (15-150 keV) in 33.08 sec: 5.128047E-02 ( -0.0182647 0.0182732 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.19467e-08 ( -2.68196e-08 2.83013e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.29376 ( -4.21391 9.127140E-03) )
beta : -4.47890 ( -0.628330 6.09216 )
Epeak [keV] : 28.0665 ( -5.55319 9971.89 )
Norm@50keV : 1.122923E-03 ( -30.1750 119.081 )
------------------------------------------------------------
Chi-Squared = 55.01896 using 59 PHA bins.
Reduced chi-squared = 1.000345 for 55 degrees of freedom
Null hypothesis probability = 0.474
Photon flux (15-150 keV) in 33.08 sec: 5.037605E-02 ( -0.0189868 0.0189997 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.23423e-08 ( -2.58021e-08 2.87637e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.53691 ( -0.695111 0.980516 )
Norm@50keV : 2.330276E-04 ( -2.330276E-04 1.639201E-04) )
------------------------------------------------------------
Chi-Squared = 55.90500 using 59 PHA bins.
Reduced chi-squared = 0.9807894 for 57 degrees of freedom
Null hypothesis probability = 0.516
Photon flux (15-150 keV) in 33.08 sec: 4.674446E-02 ( -0.0199229 0.0200924 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.72392e-08 ( -3.79044e-08 4.49005e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.99097 ( )
Epeak [keV] : 26.8269 ( -5.97008 7.06005 )
Norm@50keV : 0.304802 ( -1.04467 3.56552 )
------------------------------------------------------------
Chi-Squared = 50.41637 using 59 PHA bins.
Reduced chi-squared = 0.9002923 for 56 degrees of freedom
Null hypothesis probability = 0.685
Photon flux (15-150 keV) in 33.08 sec: 5.128047E-02 ( -0.0182647 0.0182732 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.19467e-08 ( -2.68196e-08 2.83013e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.29376 ( -4.25570 9.127140E-03) )
beta : -4.47890 ( -0.628330 19.3597 )
Epeak [keV] : 28.0665 ( -5.55352 9971.89 )
Norm@50keV : 1.122923E-03 ( -30.1750 119.081 )
------------------------------------------------------------
Chi-Squared = 55.01896 using 59 PHA bins.
Reduced chi-squared = 1.000345 for 55 degrees of freedom
Null hypothesis probability = 0.474
Photon flux (15-150 keV) in 33.08 sec: 5.037605E-02 ( -0.0189868 0.0189997 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.23423e-08 ( -2.58021e-08 2.87637e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 23:03:01 EST 2008