batgrbproduct Analysis for Trigger=223217
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 23:46:15 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger223217/SDC
======================================================================
Trigger: 00223217 Segment: 000
BAT Trigger Time: 176654496.768 [s; MET]
Trigger Stop: 176654500.864 [s; MET]
UTC: 2006-08-07T14:41:35.402420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 252.527449283141 Dec: 31.5902332978161 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.05
Image Trigger?: NO
Rate S/N Ratio: 20.3715487874634 [ if not an image trigger ]
Image S/N Ratio: 11.05
Flight Position: [ source = BAT ]
RA: 252.527449283141 Dec: 31.5902332978161 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 252.529417379458 Dec: 31.5927931663048 [deg; J2000]
{ 16h 50m 07.1s , +31d 35' 34.1" }
+/- 1.90395440403203 [arcmin] (estimated 90% radius based on SNR)
+/- 0.757906044837911 [arcmin] (formal 1-sigma fit error)
SNR: 12.1229700402343
RA = 16h 50m 7.1s (252.529417 deg.)
Dec = 31d 35' 34" (31.592793 deg.)
Angular difference between Flight and Ground position is 0.183598 arcmin
Partial Coding Fraction: 0.671875 [ including projection effects ]
Duration
T90: 43.283999979496 +/- 11.6963052412946
Measured from: -22.3199999928474
to: 20.9639999866486 [s; relative to TRIGTIME]
T50: 17.4600000083447 +/- 6.40590351808269
Measured from: -10.9560000002384
to: 6.50400000810623 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.140000015497208
to: 0.859999984502792 [s; relative to TRIGTIME]
Total Fluence
Measured from: -40.7639999985695
to: 25.7599999904633 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.334999 0.586767 0.325501 0.124759
0.050859 0.051259 0.046025 0.044313 [error]
Peak 0.021391 0.036099 0.033041 0.009127
0.006521 0.006702 0.006216 0.005655 [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 1.25e-07 2.18e-07 2.91e-07 7.95e-07 8.48e-07 1.43e-06 erg/cm2
Error 2.37e-08 2.50e-08 4.60e-08 2.71e-07 1.09e-07 3.08e-07 erg/cm2
Peak flux Power-law 2.25e-01 2.64e-01 2.23e-01 3.20e-01 8.27e-01 1.03e+00 ph/cm2/s
Error 8.16e-02 5.89e-02 4.95e-02 1.50e-01 1.63e-01 2.06e-01 ph/cm2/s
Fluence Cutoff-PL 1.23e-07 2.21e-07 2.93e-07 6.80e-07 8.42e-07 1.19e-06 erg/cm2
Error 2.64e-08 2.98e-08 4.78e-08 4.47e-07 1.08e-07 4.74e-07 erg/cm2
Peak flux Cutoff-PL 1.66e-01 2.83e-01 2.53e-01 1.21e-01 7.84e-01 8.24e-01 ph/cm2/s
Error 1.05e-01 7.07e-02 6.53e-02 2.09e-01 2.14e-01 2.71e-01 ph/cm2/s
Fluence Band 1.18e-07 2.26e-07 2.88e-07 7.03e-07 8.33e-07 1.33e-06 erg/cm2
Error 2.61e-08 2.77e-08 4.35e-08 5.36e-07 8.84e-08 4.71e-07 erg/cm2
Peak flux Band 1.66e-01 2.83e-01 2.53e-01 1.22e-01 7.84e-01 8.25e-01 ph/cm2/s
Error 1.05e-01 7.07e-02 6.52e-02 1.84e-01 1.75e-01 2.55e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.584 0.207 - - 1.36e-03 1.59e-04 53.104 57
CPL 1.233 0.000 103.9 0.0 2.05e-03 5.00e+23 53.409 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.242 0.334 - - 7.00e-03 1.34e-03 42.054 57
CPL 0.008 1.979 89.1 4969.4 2.58e-02 1.61e-01 40.366 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: 3.840000 sec.
T50 in the 50-300 keV band: 2.368000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 66.524 -40.764 25.760
T90 43.284 -22.320 20.964
T50 17.460 -10.956 6.504
Peak 1.000 -0.140 0.860
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
252.5294 +31.5928 0.0159 29.8 160.2 1.3651 12.1 TRIG_00223217
------------------------------------------
Foreground time interval of the image:
-40.764 25.760 (delta_t = 66.524 [sec])
Background time interval of the image:
-239.768 -40.764 (delta_t = 199.004 [sec])
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 -40.764 sec. to 25.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58405 ( -0.205029 0.208073 )
Norm@50keV : 1.360159E-03 ( -1.602630E-04 1.582867E-04) )
------------------------------------------------------------
Chi-Squared = 53.10371 using 59 PHA bins.
Reduced chi-squared = 0.9316441 for 57 degrees of freedom
Null hypothesis probability = 0.622
Photon flux (15-150 keV) in 66.52 sec: 0.173935 ( -0.019639 0.019682 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.47817e-07 ( -1.07696e-07 1.09346e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -40.764 sec. to 25.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23289 ( )
Epeak [keV] : 103.886 ( )
Norm@50keV : 2.052422E-03 ( -1.716019E-04 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 53.40858 using 59 PHA bins.
Reduced chi-squared = 0.9537247 for 56 degrees of freedom
Null hypothesis probability = 0.574
Photon flux (15-150 keV) in 66.52 sec: 0.173294 ( -0.019655 0.0194 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.41618e-07 ( -1.00937e-07 1.14873e-07 ) ergs/cm2
Band function
Time interval is from -40.764 sec. to 25.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05412 ( -8.94588 4.23001 )
beta : -1.69274 ( -8.30726 0.303892 )
Epeak [keV] : 66.8342 ( -66.7342 9933.17 )
Norm@50keV : 2.829718E-03 ( -2.829718E-03 120.196 )
------------------------------------------------------------
Chi-Squared = 52.85974 using 59 PHA bins.
Reduced chi-squared = 0.9610862 for 55 degrees of freedom
Null hypothesis probability = 0.557
Photon flux (15-150 keV) in 66.52 sec: 0.171958 ( -0.020185 0.020713 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.3323e-07 ( -1.14774e-07 6.19966e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.140 sec. to 0.860 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24194 ( -0.336290 0.331619 )
Norm@50keV : 6.999435E-03 ( -1.335479E-03 1.335450E-03) )
------------------------------------------------------------
Chi-Squared = 42.05426 using 59 PHA bins.
Reduced chi-squared = 0.7377940 for 57 degrees of freedom
Null hypothesis probability = 0.931
Photon flux (15-150 keV) in 1.000 sec: 0.826778 ( -0.162726 0.163443 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.01921e-08 ( -1.46507e-08 1.48725e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.140 sec. to 0.860 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 7.660940E-03 ( -2.52406 1.43396 )
Epeak [keV] : 89.1332 ( -27.9251 9910.87 )
Norm@50keV : 2.575165E-02 ( -1.954801E-02 0.303226 )
------------------------------------------------------------
Chi-Squared = 40.36618 using 59 PHA bins.
but latest trial 39.9283 gives Chi-Squared = 16.1169
Reduced chi-squared = 0.7208246 for 56 degrees of freedom
Null hypothesis probability = 0.943
Photon flux (15-150 keV) in 1.000 sec: 0.784114 ( -0.169906 0.258136 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.61225e-08 ( -1.60688e-08 1.61513e-08 ) ergs/cm2
Band function
Time interval is from -0.140 sec. to 0.860 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.074297E-03 ( -1.43297 1.82873 )
beta : -9.28268 ( -0.717322 8.24383 )
Epeak [keV] : 89.0985 ( -31.2795 9910.90 )
Norm@50keV : 2.575507E-02 ( -1.955226E-02 0.159429 )
------------------------------------------------------------
Chi-Squared = 40.36624 using 59 PHA bins.
Reduced chi-squared = 0.7339317 for 55 degrees of freedom
Null hypothesis probability = 0.930
Photon flux (15-150 keV) in 1.000 sec: 0.784316 ( -0.176734 0.173984 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.62058e-08 ( -1.60934e-08 1.60433e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 00:07:54 EST 2008