batgrbproduct Analysis for Trigger=309111
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): Sun Apr 13 19:51:33 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger309111/GCN5_download_cron
======================================================================
Trigger: 00309111 Segment: 000
BAT Trigger Time: 229769475.264 [s; MET]
Trigger Stop: 229769476.288 [s; MET]
UTC: 2008-04-13T08:51:12.549840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 326.134366952306 Dec: -19.9693461700508 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 23
Image Trigger?: NO
Rate S/N Ratio: 128.596267441944 [ if not an image trigger ]
Image S/N Ratio: 23
Flight Position: [ source = BAT ]
RA: 326.134366952306 Dec: -19.9693461700508 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 326.137976165189 Dec: -19.9811205194429 [deg; J2000]
{ 21h 44m 33.1s , -19d 58' 52.0" }
+/- 0.833777143790846 [arcmin] (estimated 90% radius based on SNR)
+/- 0.268998034072579 [arcmin] (formal 1-sigma fit error)
SNR: 39.4370221799641
RA = 21h 44m 33.1s (326.137976 deg.)
Dec = -19d 58' 52" (-19.981121 deg.)
Angular difference between Flight and Ground position is 0.735194 arcmin
Partial Coding Fraction: 0.2011719 [ including projection effects ]
Duration
T90: 6.97599998116493 +/- 1.39649849929756
Measured from: -0.624000012874603
to: 6.35199996829033 [s; relative to TRIGTIME]
T50: 1.66399997472763 +/- 0.136704071868331
Measured from: 0.0640000104904175
to: 1.72799998521805 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.203999996185303
to: 0.796000003814697 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.991999983787537
to: 10.6719999909401 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.607682 2.119956 1.387821 0.278221
0.050605 0.053634 0.046006 0.033302 [error]
Peak 0.549161 0.861127 0.636270 0.138496
0.022638 0.027123 0.024453 0.014885 [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 5.97e-07 9.17e-07 1.06e-06 2.34e-06 3.26e-06 4.99e-06 erg/cm2
Error 3.71e-08 3.34e-08 4.59e-08 2.23e-07 1.12e-07 0.00e+00 erg/cm2
Peak flux Power-law 6.41e+00 6.31e+00 4.34e+00 4.70e+00 1.89e+01 2.18e+01 ph/cm2/s
Error 4.59e-01 2.77e-01 1.95e-01 4.36e-01 7.85e-01 8.30e-01 ph/cm2/s
Fluence Cutoff-PL 5.25e-07 9.53e-07 1.10e-06 1.19e-06 3.15e-06 3.73e-06 erg/cm2
Error 4.77e-08 3.81e-08 5.28e-08 3.54e-07 1.23e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 5.67e+00 6.54e+00 4.62e+00 2.93e+00 1.85e+01 1.98e+01 ph/cm2/s
Error 5.77e-01 3.12e-01 2.46e-01 7.19e-01 8.15e-01 1.11e+00 ph/cm2/s
Fluence Band 5.21e-07 9.49e-07 1.10e-06 1.20e-06 3.15e-06 3.79e-06 erg/cm2
Error 4.72e-08 3.80e-08 5.27e-08 3.54e-07 1.23e-07 3.72e-07 erg/cm2
Peak flux Band 5.48e+00 6.67e+00 4.51e+00 3.77e+00 1.83e+01 2.04e+01 ph/cm2/s
Error 6.79e-01 3.73e-01 2.79e-01 9.63e-01 8.49e-01 1.22e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.795 0.062 - - 3.04e-02 1.03e-03 46.311 57
CPL 1.222 0.276 72.2 13.9 5.67e-02 1.71e-02 32.120 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.539 0.066 - - 1.50e-01 5.73e-03 43.260 57
CPL 1.005 0.291 102.0 35.5 2.67e-01 8.42e-02 32.184 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: 8.960000 sec.
T50 in the 50-300 keV band: 1.216000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 11.664 -0.992 10.672
T90 6.976 -0.624 6.352
T50 1.664 0.064 1.728
Peak 1.000 -0.204 0.796
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
326.1380 -19.9811 0.0049 36.2 -87.4 5.6905 39.4 TRIG_00309111
------------------------------------------
Foreground time interval of the image:
-0.992 10.672 (delta_t = 11.664 [sec])
Background time interval of the image:
-239.264 -0.992 (delta_t = 238.272 [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 -0.992 sec. to 10.672 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79454 ( -6.180549E-02 6.220734E-02) )
Norm@50keV : 3.038774E-02 ( -1.025498E-03 1.024503E-03) )
------------------------------------------------------------
Chi-Squared = 46.31135 using 59 PHA bins.
Reduced chi-squared = 0.8124799 for 57 degrees of freedom
Null hypothesis probability = 0.843
Photon flux (15-150 keV) in 11.66 sec: 4.17851 ( -0.15721 0.15799 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.2626e-06 ( -1.11575e-07 1.11726e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.992 sec. to 10.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22221 ( -0.284917 0.268007 )
Epeak [keV] : 72.1842 ( -8.94202 18.8665 )
Norm@50keV : 5.667515E-02 ( -1.407187E-02 2.010266E-02) )
------------------------------------------------------------
Chi-Squared = 32.12043 using 59 PHA bins.
Reduced chi-squared = 0.5735792 for 56 degrees of freedom
Null hypothesis probability = 0.996
Photon flux (15-150 keV) in 11.66 sec: 4.00431 ( -0.17307 0.17441 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.15452e-06 ( -1.22815e-07 1.23876e-07 ) ergs/cm2
Band function
Time interval is from -0.992 sec. to 10.672 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22345 ( -0.266669 0.286222 )
beta : -9.18330 ( -0.816700 7.14980 )
Epeak [keV] : 72.2409 ( -9.00666 18.7909 )
Norm@50keV : 5.658129E-02 ( -1.398463E-02 2.019844E-02) )
------------------------------------------------------------
Chi-Squared = 32.12059 using 59 PHA bins.
Reduced chi-squared = 0.5840108 for 55 degrees of freedom
Null hypothesis probability = 0.994
Photon flux (15-150 keV) in 11.66 sec: 4.00455 ( -0.17333 0.17417 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.15249e-06 ( -1.23631e-07 1.22687e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.208 sec. to 0.800 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53909 ( -6.562865E-02 6.577432E-02) )
Norm@50keV : 0.150085 ( -5.733281E-03 5.732536E-03) )
------------------------------------------------------------
Chi-Squared = 43.25982 using 59 PHA bins.
Reduced chi-squared = 0.7589442 for 57 degrees of freedom
Null hypothesis probability = 0.911
Photon flux (15-150 keV) in 1.008 sec: 18.9403 ( -0.7836 0.7856 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42649e-06 ( -5.70326e-08 5.70982e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.208 sec. to 0.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00543 ( -0.300267 0.281130 )
Epeak [keV] : 101.950 ( -18.7949 52.1325 )
Norm@50keV : 0.267316 ( -6.864101E-02 9.979126E-02) )
------------------------------------------------------------
Chi-Squared = 32.18446 using 59 PHA bins.
Reduced chi-squared = 0.5747226 for 56 degrees of freedom
Null hypothesis probability = 0.996
Photon flux (15-150 keV) in 1.008 sec: 18.4706 ( -0.8133 0.8158 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39882e-06 ( -6.02986e-08 5.99044e-08 ) ergs/cm2
Band function
Time interval is from -0.208 sec. to 0.800 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.659067 ( -0.556512 0.890247 )
beta : -1.82457 ( -8.17543 0.182504 )
Epeak [keV] : 71.6260 ( -23.5861 61.3633 )
Norm@50keV : 0.425350 ( -0.211252 1.10453 )
------------------------------------------------------------
Chi-Squared = 30.96129 using 59 PHA bins.
Reduced chi-squared = 0.5629326 for 55 degrees of freedom
Null hypothesis probability = 0.996
Photon flux (15-150 keV) in 1.008 sec: 18.3190 ( -0.8716 0.8256 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39763e-06 ( -6.01756e-08 5.98944e-08 ) ergs/cm2
Plot creation:
Sun Apr 13 20:32:41 EDT 2008