batgrbproduct Analysis for Trigger=338338
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 v2.42
Process Start Time (local time): Sun Dec 28 02:57:27 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger338338/GCN5_download_cron
======================================================================
Trigger: 00338338 Segment: 000
BAT Trigger Time: 252119864.128 [s; MET]
Trigger Stop: 252119865.152 [s; MET]
UTC: 2008-12-28T01:17:40.758740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 39.4673999801958 Dec: 30.842582797203 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.61
Image Trigger?: NO
Rate S/N Ratio: 10.6770782520313 [ if not an image trigger ]
Image S/N Ratio: 7.61
Flight Position: [ source = BAT ]
RA: 39.4673999801958 Dec: 30.842582797203 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 39.4766238004082 Dec: 30.8325742872935 [deg; J2000]
{ 02h 37m 54.4s , +30d 49' 57.3" }
+/- 2.31700757424159 [arcmin] (estimated 90% radius based on SNR)
+/- 1.11904275759816 [arcmin] (formal 1-sigma fit error)
SNR: 9.15784832693303
Angular difference between Flight and Ground position is 0.765778 arcmin
Partial Coding Fraction: 0.859375 [ including projection effects ]
Duration
T90: 3 +/- 1.4142135623731
Measured from: -0.127999901771545
to: 2.87200009822845 [s; relative to TRIGTIME]
T50: 2 +/- 1
Measured from: -0.127999901771545
to: 1.87200009822845 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.872000008821487
to: 1.87200000882149 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.127999991178513
to: 2.87200000882149 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.068938 0.074772 0.020329 0.002351
0.009659 0.009799 0.008408 0.007159 [error]
Peak 0.030825 0.021957 0.010309 0.004588
0.005628 0.005771 0.004814 0.004084 [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 2.16e-08 2.76e-08 2.58e-08 4.24e-08 8.94e-08 1.17e-07 erg/cm2
Error 4.51e-09 4.53e-09 7.77e-09 2.48e-08 1.79e-08 3.42e-08 erg/cm2
Peak flux Power-law 2.85e-01 1.91e-01 8.37e-02 5.05e-02 5.85e-01 6.11e-01 ph/cm2/s
Error 9.22e-02 4.82e-02 4.22e-02 4.96e-02 1.37e-01 1.47e-01 ph/cm2/s
Fluence Cutoff-PL 2.09e-08 3.03e-08 2.32e-08 1.00e-08 8.13e-08 1.02e-07 erg/cm2
Error 4.97e-09 7.18e-09 1.12e-08 3.39e-08 2.21e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.85e-01 1.91e-01 8.36e-02 5.01e-02 5.85e-01 6.10e-01 ph/cm2/s
Error 9.22e-02 4.82e-02 4.22e-02 4.93e-02 1.37e-01 1.47e-01 ph/cm2/s
Fluence Band 2.02e-08 3.12e-08 2.26e-08 2.28e-08 8.28e-08 9.83e-08 erg/cm2
Error 5.07e-09 6.19e-09 8.41e-09 3.00e-08 1.79e-08 4.31e-08 erg/cm2
Peak flux Band 2.63e-01 1.88e-01 9.04e-02 5.95e-02 5.85e-01 6.26e-01 ph/cm2/s
Error 7.07e-02 4.57e-02 2.37e-02 1.37e-01 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.098 0.311 - - 3.21e-03 7.05e-04 52.367 57
CPL 1.363 1.700 32.6 5000.0 9.14e-03 2.36e-01 51.807 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.192 0.562 - - 3.55e-03 1.34e-03 57.025 57
CPL 1.995 1.059 7.1 0.0 4.02e-03 1.34e-03 57.400 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 3.000 -0.128 2.872
T90 3.000 -0.128 2.872
T50 2.000 -0.128 1.872
Peak 1.000 0.872 1.872
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
39.4766 +30.8326 0.0210 25.9 4.7 0.1592 9.2 TRIG_00338338
------------------------------------------
Foreground time interval of the image:
-0.128 2.872 (delta_t = 3.000 [sec])
Background time interval of the image:
-239.128 -14.438 (delta_t = 224.690 [sec])
-13.128 -0.128 (delta_t = 13.000 [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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.128 sec. to 2.872 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.09801 ( -0.295117 0.327280 )
Norm@50keV : 3.208200E-03 ( -7.170746E-04 6.928314E-04) )
------------------------------------------------------------
Chi-Squared = 52.36690 using 59 PHA bins.
Reduced chi-squared = 0.9187175 for 57 degrees of freedom
Null hypothesis probability = 0.649
Photon flux (15-150 keV) in 3.000 sec: 0.504238 ( -0.07924 0.07924 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.94003e-08 ( -1.75017e-08 1.82235e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.128 sec. to 2.872 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36253 ( -2.67136 0.728977 )
Epeak [keV] : 32.6419 ( -32.6319 9967.36 )
Norm@50keV : 9.141785E-03 ( -9.141785E-03 0.462435 )
------------------------------------------------------------
Chi-Squared = 51.80735 using 59 PHA bins.
but latest trial 2.08050 gives Chi-Squared = 0.569378
Reduced chi-squared = 0.9251313 for 56 degrees of freedom
Null hypothesis probability = 0.634
Photon flux (15-150 keV) in 3.000 sec: 0.491393 ( -0.084399 0.12209 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.12949e-08 ( -2.04327e-08 2.37978e-08 ) ergs/cm2
Band function
Time interval is from -0.128 sec. to 2.872 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.28424 ( -8.71576 4.81596 )
beta : -2.42908 ( -7.57092 0.554092 )
Epeak [keV] : 31.3028 ( -31.2028 44.4507 )
Norm@50keV : 1.052231E-02 ( -7.642849E-02 163.532 )
------------------------------------------------------------
Chi-Squared = 51.19176 using 59 PHA bins.
Reduced chi-squared = 0.9307593 for 55 degrees of freedom
Null hypothesis probability = 0.621
Photon flux (15-150 keV) in 3.000 sec: 0.492477 ( -0.078974 0.079111 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.27931e-08 ( -1.81467e-08 1.76424e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.872 sec. to 1.872 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19238 ( -0.503240 0.620696 )
Norm@50keV : 3.548058E-03 ( -1.398150E-03 1.277783E-03) )
------------------------------------------------------------
Chi-Squared = 57.02528 using 59 PHA bins.
Reduced chi-squared = 1.000443 for 57 degrees of freedom
Null hypothesis probability = 0.474
Photon flux (15-150 keV) in 1.000 sec: 0.585085 ( -0.136796 0.136783 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.33607e-08 ( -1.0404e-08 1.10041e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.872 sec. to 1.872 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99465 ( -0.901886 1.21686 )
Epeak [keV] : 7.07391 ( )
Norm@50keV : 4.015858E-03 ( -1.387690E-03 1.300778E-03) )
------------------------------------------------------------
Chi-Squared = 57.39953 using 59 PHA bins.
Reduced chi-squared = 1.024992 for 56 degrees of freedom
Null hypothesis probability = 0.423
Photon flux (15-150 keV) in 1.000 sec: 0.584824 ( -0.136756 0.13674 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.33215e-08 ( -1.03739e-08 1.10301e-08 ) ergs/cm2
Band function
Time interval is from 0.872 sec. to 1.872 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59040 ( -2.193451E-04 14.9998 )
beta : -2.11343 ( -0.621578 0.502810 )
Epeak [keV] : 6.00046 ( -5.90046 9994.00 )
Norm@50keV : 1.666783E-02 ( -0.190199 0.173562 )
------------------------------------------------------------
Chi-Squared = 57.08554 using 59 PHA bins.
Reduced chi-squared = 1.037919 for 55 degrees of freedom
Null hypothesis probability = 0.398
Photon flux (15-150 keV) in 1.000 sec: 0.585310 ( -0.136559 0.136632 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.39102e-08 ( -7.9111e-09 8.6136e-09 ) ergs/cm2
Plot creation:
Sun Dec 28 03:17:28 EST 2008