batgrbproduct Analysis for Trigger=339295
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): Wed Jan 7 14:19:22 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger339295/GCN5_download_cron
======================================================================
Trigger: 00339295 Segment: 000
BAT Trigger Time: 252996488.704 [s; MET]
Trigger Stop: 252996489.728 [s; MET]
UTC: 2009-01-07T04:48:04.308060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 302.42575240314 Dec: 4.72746160298767 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.58
Image Trigger?: NO
Rate S/N Ratio: 14.5258390463339 [ if not an image trigger ]
Image S/N Ratio: 8.58
Flight Position: [ source = BAT ]
RA: 302.42575240314 Dec: 4.72746160298767 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 302.409279096408 Dec: 4.74386202932531 [deg; J2000]
{ 20h 09m 38.2s , +04d 44' 37.9" }
+/- 2.39807143505193 [arcmin] (estimated 90% radius based on SNR)
+/- 1.08156433944459 [arcmin] (formal 1-sigma fit error)
SNR: 8.7188300898794
Angular difference between Flight and Ground position is 1.392329 arcmin
Partial Coding Fraction: 0.7421875 [ including projection effects ]
Duration
T90: 12.188000023365 +/- 0.726911279358457
Measured from: 0.384000092744827
to: 12.5720001161098 [s; relative to TRIGTIME]
T50: 10.5920000076294 +/- 1.35212425526946
Measured from: 0.93600007891655
to: 11.5280000865459 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.300000011920929
to: 1.30000001192093 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.156000018119812
to: 12.9079999923706 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.096854 0.190641 0.092475 0.018526
0.022344 0.022505 0.020186 0.019267 [error]
Peak 0.034613 0.048921 0.040328 0.003028
0.006581 0.006878 0.006174 0.005427 [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 3.87e-08 6.34e-08 7.85e-08 1.92e-07 2.35e-07 3.73e-07 erg/cm2
Error 8.88e-09 1.01e-08 1.88e-08 9.24e-08 4.50e-08 1.12e-07 erg/cm2
Peak flux Power-law 3.42e-01 3.48e-01 2.50e-01 2.86e-01 1.05e+00 1.23e+00 ph/cm2/s
Error 8.55e-02 5.51e-02 5.08e-02 1.18e-01 1.60e-01 1.95e-01 ph/cm2/s
Fluence Cutoff-PL 3.44e-08 7.68e-08 6.97e-08 1.90e-08 1.97e-07 2.00e-07 erg/cm2
Error 9.94e-09 1.54e-08 2.73e-08 5.76e-08 4.90e-08 7.67e-08 erg/cm2
Peak flux Cutoff-PL 3.21e-01 3.64e-01 2.57e-01 1.73e-01 1.04e+00 1.12e+00 ph/cm2/s
Error 9.76e-02 5.06e-02 5.57e-02 1.72e-01 1.63e-01 2.48e-01 ph/cm2/s
Fluence Band 3.45e-08 7.56e-08 7.15e-08 1.40e-07 2.11e-07 2.78e-07 erg/cm2
Error 9.95e-09 1.35e-08 2.04e-08 5.61e-08 4.18e-08 1.29e-07 erg/cm2
Peak flux Band 3.21e-01 3.64e-01 2.57e-01 1.73e-01 1.04e+00 1.12e+00 ph/cm2/s
Error 9.76e-02 6.70e-02 5.57e-02 1.72e-01 1.65e-01 2.48e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.692 0.269 - - 1.99e-03 3.60e-04 70.772 57
CPL 0.044 1.724 48.1 26.9 1.84e-02 1.74e-01 66.343 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.480 0.264 - - 8.47e-03 1.36e-03 32.523 57
CPL 1.064 1.075 108.6 5000.0 1.40e-02 2.26e-02 31.952 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: 1.216000 sec.
T50 in the 50-300 keV band: 0.640000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 12.752 0.156 12.908
T90 12.188 0.384 12.572
T50 10.592 0.936 11.528
Peak 1.000 0.300 1.300
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
302.4093 +4.7439 0.0220 22.5 -63.7 0.3815 8.7 TRIG_00339295
------------------------------------------
Foreground time interval of the image:
0.156 12.908 (delta_t = 12.752 [sec])
Background time interval of the image:
-239.704 0.156 (delta_t = 239.860 [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 0.156 sec. to 12.908 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69242 ( -0.263998 0.274894 )
Norm@50keV : 1.988270E-03 ( -3.629012E-04 3.563117E-04) )
------------------------------------------------------------
Chi-Squared = 70.77228 using 59 PHA bins.
Reduced chi-squared = 1.241619 for 57 degrees of freedom
Null hypothesis probability = 0.104
Photon flux (15-150 keV) in 12.75 sec: 0.263371 ( -0.041943 0.041951 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.34923e-07 ( -4.43624e-08 4.56616e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.156 sec. to 12.908 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.382881E-02 ( -2.07840 1.37000 )
Epeak [keV] : 48.1343 ( -10.4921 43.2427 )
Norm@50keV : 1.840368E-02 ( -1.840368E-02 0.330541 )
------------------------------------------------------------
Chi-Squared = 66.34344 using 59 PHA bins.
Reduced chi-squared = 1.184704 for 56 degrees of freedom
Null hypothesis probability = 0.162
Photon flux (15-150 keV) in 12.75 sec: 0.249389 ( -0.042555 0.043074 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.96518e-07 ( -4.50585e-08 5.29418e-08 ) ergs/cm2
Band function
Time interval is from 0.156 sec. to 12.908 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.00294 ( -3.98339 1.31440 )
beta : -2.67774 ( -0.853581 12.2290 )
Epeak [keV] : 75.4330 ( -9.68511 35.8450 )
Norm@50keV : 4.371437E-03 ( -16.7092 14.0851 )
------------------------------------------------------------
Chi-Squared = 68.41074 using 59 PHA bins.
Reduced chi-squared = 1.243832 for 55 degrees of freedom
Null hypothesis probability = 0.106
Photon flux (15-150 keV) in 12.75 sec: 0.253404 ( -0.040052 0.042686 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.1093e-07 ( -4.26092e-08 4.10831e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.300 sec. to 1.300 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47975 ( -0.261324 0.266750 )
Norm@50keV : 8.474310E-03 ( -1.366053E-03 1.345537E-03) )
------------------------------------------------------------
Chi-Squared = 32.52303 using 59 PHA bins.
Reduced chi-squared = 0.5705795 for 57 degrees of freedom
Null hypothesis probability = 0.996
Photon flux (15-150 keV) in 1.000 sec: 1.05227 ( -0.160446 0.16055 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.06371e-08 ( -1.42484e-08 1.45953e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.300 sec. to 1.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06361 ( -1.12013 1.02983 )
Epeak [keV] : 108.585 ( -108.575 9891.42 )
Norm@50keV : 1.400161E-02 ( -6.721240E-03 3.842265E-02) )
------------------------------------------------------------
Chi-Squared = 31.95221 using 59 PHA bins.
Reduced chi-squared = 0.5705752 for 56 degrees of freedom
Null hypothesis probability = 0.996
Photon flux (15-150 keV) in 1.000 sec: 1.03600 ( -0.164376 0.16136 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.78054e-08 ( -1.5426e-08 1.58232e-08 ) ergs/cm2
Band function
Time interval is from 0.300 sec. to 1.300 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06390 ( -8.93610 0.900682 )
beta : -7.25700 ( -2.74300 7.75456 )
Epeak [keV] : 108.622 ( -108.522 9891.38 )
Norm@50keV : 1.399552E-02 ( -299.396 69.9412 )
------------------------------------------------------------
Chi-Squared = 31.95223 using 59 PHA bins.
Reduced chi-squared = 0.5809497 for 55 degrees of freedom
Null hypothesis probability = 0.995
Photon flux (15-150 keV) in 1.000 sec: 1.03600 ( -0.164609 0.16445 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.78311e-08 ( -1.55058e-08 1.58082e-08 ) ergs/cm2
Plot creation:
Wed Jan 7 14:38:09 EST 2009