batgrbproduct Analysis for Trigger=306721
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): Wed Mar 19 09:29:44 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger306721/GCN5_download_cron
======================================================================
Trigger: 00306721 Segment: 000
BAT Trigger Time: 227556490.816 [s; MET]
Trigger Stop: 227556491.84 [s; MET]
UTC: 2008-03-18T18:08:08.163480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 41.2861989781123 Dec: 5.3635439317828 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.92
Image Trigger?: NO
Rate S/N Ratio: 26.1916017074176 [ if not an image trigger ]
Image S/N Ratio: 5.92
Flight Position: [ source = BAT ]
RA: 41.2861989781123 Dec: 5.3635439317828 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 41.2887678268598 Dec: 5.48801743161736 [deg; J2000]
{ 02h 45m 09.3s , +05d 29' 16.9" }
+/- 3.70977992394704 [arcmin] (estimated 90% radius based on SNR)
+/- 2.93484689274464 [arcmin] (formal 1-sigma fit error)
SNR: 4.67480914331059
RA = 2h 45m 9.3s (41.288768 deg.)
Dec = 5d 29' 17" (5.488017 deg.)
Angular difference between Flight and Ground position is 7.469986 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.000339 0.005419 0.015448 0.030591
0.005429 0.006036 0.006011 0.007134 [error]
Peak -0.000339 0.005419 0.015448 0.030591
0.005429 0.006036 0.006011 0.007134 [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 4.21e-10 2.21e-09 9.95e-09 1.81e-07 3.06e-08 1.92e-07 erg/cm2
Error 8.87e-10 2.60e-09 7.75e-09 3.35e-07 1.57e-08 3.38e-07 erg/cm2
Peak flux Power-law 1.28e-02 3.57e-02 8.04e-02 4.82e-01 2.17e-01 6.11e-01 ph/cm2/s
Error 2.75e-02 4.33e-02 6.33e-02 7.80e-01 1.74e-01 6.88e-01 ph/cm2/s
Fluence Cutoff-PL 1.84e-10 1.93e-09 1.12e-08 7.29e-08 3.13e-08 7.13e-08 erg/cm2
Error 8.67e-10 2.63e-09 7.72e-09 3.61e-07 2.39e-08 3.65e-07 erg/cm2
Peak flux Cutoff-PL 1.28e-02 3.57e-02 8.05e-02 4.80e-01 2.17e-01 6.09e-01 ph/cm2/s
Error 2.75e-02 4.33e-02 6.34e-02 8.40e-01 1.74e-01 7.47e-01 ph/cm2/s
Fluence Band 2.38e-10 1.93e-09 1.12e-08 7.66e-08 3.13e-08 1.24e-07 erg/cm2
Error 8.58e-10 2.62e-09 7.95e-09 3.35e-07 2.39e-08 2.53e-07 erg/cm2
Peak flux Band 6.67e-03 3.04e-02 8.98e-02 2.47e-01 2.15e-01 3.74e-01 ph/cm2/s
Error 2.68e-02 4.34e-02 6.27e-02 8.90e-01 1.72e-01 7.89e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.171 1.966 - - 1.50e-03 1.44e-03 46.446 57
CPL -1.440 3.948 220.9 5000.0 3.31e-03 1.09e-02 46.326 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.171 1.966 - - 1.50e-03 1.44e-03 46.446 57
CPL -1.440 3.948 220.9 5000.0 3.31e-03 1.09e-02 46.326 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
41.2888 +5.4880 0.0414 25.5 -21.6 0.0609 4.7 TRIG_00306721
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-21.515 -10.816 (delta_t = 10.699 [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 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.171128 ( -2.82887 1.10244 )
Norm@50keV : 1.502643E-03 ( -1.502643E-03 1.374733E-03) )
------------------------------------------------------------
Chi-Squared = 46.44625 using 59 PHA bins.
Reduced chi-squared = 0.8148466 for 57 degrees of freedom
Null hypothesis probability = 0.840
Photon flux (15-150 keV) in 1.024 sec: 0.216754 ( -0.216754 0.130401 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.06392e-08 ( -1.57122e-08 1.57372e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.43966 ( -1.56034 6.33645 )
Epeak [keV] : 220.900 ( -220.890 9779.10 )
Norm@50keV : 3.314648E-03 ( -3.314648E-03 1.853102E-02) )
------------------------------------------------------------
Chi-Squared = 46.32592 using 59 PHA bins.
but latest trial 3.14997 gives Chi-Squared = 1.82767
Reduced chi-squared = 0.8272486 for 56 degrees of freedom
Null hypothesis probability = 0.818
Photon flux (15-150 keV) in 1.024 sec: 0.216827 ( -0.216827 0.130297 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.12827e-08 ( -3.12827e-08 1.64575e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.234788 ( -14.9999 5.817413E-05) )
beta : 0.170896 ( -0.735985 9.82921 )
Epeak [keV] : 26.3395 ( -26.2410 9973.66 )
Norm@50keV : 2.089464E-03 ( -4.48996 14962.1 )
------------------------------------------------------------
Chi-Squared = 46.44625 using 59 PHA bins.
Reduced chi-squared = 0.8444773 for 55 degrees of freedom
Null hypothesis probability = 0.787
Photon flux (15-150 keV) in 1.024 sec: 0.215007 ( -0.215007 0.129281 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.1283e-08 ( -3.1283e-08 1.64588e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.171128 ( -2.82887 1.10244 )
Norm@50keV : 1.502643E-03 ( -1.502643E-03 1.374733E-03) )
------------------------------------------------------------
Chi-Squared = 46.44625 using 59 PHA bins.
Reduced chi-squared = 0.8148466 for 57 degrees of freedom
Null hypothesis probability = 0.840
Photon flux (15-150 keV) in 1.024 sec: 0.216754 ( -0.216754 0.130401 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.06392e-08 ( -1.57122e-08 1.57372e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.43966 ( -1.56034 6.33645 )
Epeak [keV] : 220.900 ( -220.890 9779.10 )
Norm@50keV : 3.314648E-03 ( -3.314648E-03 1.853102E-02) )
------------------------------------------------------------
Chi-Squared = 46.32592 using 59 PHA bins.
but latest trial 3.14997 gives Chi-Squared = 1.82767
Reduced chi-squared = 0.8272486 for 56 degrees of freedom
Null hypothesis probability = 0.818
Photon flux (15-150 keV) in 1.024 sec: 0.216827 ( -0.216827 0.130297 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.12827e-08 ( -3.12827e-08 1.64575e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.234788 ( -14.9999 5.817413E-05) )
beta : 0.170896 ( -0.735985 9.82921 )
Epeak [keV] : 26.3395 ( -26.2410 9973.66 )
Norm@50keV : 2.089464E-03 ( -4.48996 14962.1 )
------------------------------------------------------------
Chi-Squared = 46.44625 using 59 PHA bins.
Reduced chi-squared = 0.8444773 for 55 degrees of freedom
Null hypothesis probability = 0.787
Photon flux (15-150 keV) in 1.024 sec: 0.215007 ( -0.215007 0.129281 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.1283e-08 ( -3.1283e-08 1.64588e-08 ) ergs/cm2
Plot creation:
Wed Mar 19 09:48:23 EDT 2008