batgrbproduct Analysis for Trigger=306754
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 10:36:22 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger306754/GCN5_download_cron
======================================================================
Trigger: 00306754 Segment: 000
BAT Trigger Time: 227598344.704 [s; MET]
Trigger Stop: 227598356.864 [s; MET]
UTC: 2008-03-19T05:45:42.050320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 206.354093753083 Dec: 44.0789866539064 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.23
Image Trigger?: NO
Rate S/N Ratio: 15.9687194226713 [ if not an image trigger ]
Image S/N Ratio: 7.23
Flight Position: [ source = BAT ]
RA: 206.354093753083 Dec: 44.0789866539064 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 206.352368815527 Dec: 44.0798033417619 [deg; J2000]
{ 13h 45m 24.6s , +44d 04' 47.3" }
+/- 1.68179060463727 [arcmin] (estimated 90% radius based on SNR)
+/- 0.69518741623165 [arcmin] (formal 1-sigma fit error)
SNR: 14.4739498293241
RA = 13h 45m 24.6s (206.352369 deg.)
Dec = 44d 4' 47" (44.079803 deg.)
Angular difference between Flight and Ground position is 0.089045 arcmin
Partial Coding Fraction: 0.07421875 [ including projection effects ]
Duration
T90: 64 +/- 35.7770876399966
Measured from: -7.7039999961853
to: 56.2960000038147 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: -7.7039999961853
to: 24.2960000038147 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 31.7960000038147
to: 32.7960000038147 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.7039999961853
to: 72.2960000038147 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.677262 2.406081 2.159682 0.445040
0.169963 0.174870 0.154953 0.129535 [error]
Peak 0.544984 0.648404 0.614212 0.188416
0.077727 0.080085 0.071699 0.058270 [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 7.18e-07 1.25e-06 1.65e-06 4.45e-06 4.82e-06 8.09e-06 erg/cm2
Error 1.01e-07 1.06e-07 1.51e-07 8.84e-07 3.77e-07 9.81e-07 erg/cm2
Peak flux Power-law 4.37e-01 4.01e-01 2.54e-01 2.47e-01 1.19e+00 1.34e+00 ph/cm2/s
Error 9.74e-02 5.40e-02 3.78e-02 7.69e-02 1.56e-01 1.61e-01 ph/cm2/s
Fluence Cutoff-PL 6.64e-07 1.29e-06 1.72e-06 2.88e-06 4.76e-06 6.55e-06 erg/cm2
Error 1.25e-07 9.14e-08 1.82e-07 1.71e-06 3.89e-07 1.74e-06 erg/cm2
Peak flux Cutoff-PL 4.36e-01 4.01e-01 2.54e-01 2.46e-01 1.19e+00 1.34e+00 ph/cm2/s
Error 9.74e-02 5.40e-02 3.79e-02 7.73e-02 1.56e-01 1.60e-01 ph/cm2/s
Fluence Band 6.59e-07 1.28e-06 1.72e-06 2.89e-06 4.76e-06 6.68e-06 erg/cm2
Error 1.24e-07 1.21e-07 1.82e-07 1.99e-06 3.88e-07 1.69e-06 erg/cm2
Peak flux Band 4.32e-01 4.00e-01 2.55e-01 2.49e-01 1.19e+00 1.34e+00 ph/cm2/s
Error 5.29e-02 5.06e-02 3.19e-02 7.07e-02 1.44e-01 1.60e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.596 0.131 - - 6.44e-03 4.87e-04 45.302 57
CPL 1.232 0.511 116.7 4965.4 9.52e-03 5.56e-03 43.844 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.657 0.218 - - 9.13e-03 1.11e-03 38.608 57
CPL 1.655 0.219 9990.8 5000.0 9.15e-03 1.11e-03 38.614 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: 33.088000 sec.
T50 in the 50-300 keV band: 21.504000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 80.000 -7.704 72.296
T90 64.000 -7.704 56.296
T50 32.000 -7.704 24.296
Peak 1.000 31.796 32.796
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
206.3524 +44.0798 0.0133 52.8 14.9 6.6036 14.5 TRIG_00306754
------------------------------------------
Foreground time interval of the image:
-7.704 72.296 (delta_t = 80.000 [sec])
Background time interval of the image:
-119.704 -7.704 (delta_t = 112.000 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -7.704 sec. to 72.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59608 ( -0.130590 0.130883 )
Norm@50keV : 6.436566E-03 ( -4.866626E-04 4.864959E-04) )
------------------------------------------------------------
Chi-Squared = 45.30190 using 59 PHA bins.
Reduced chi-squared = 0.7947702 for 57 degrees of freedom
Null hypothesis probability = 0.868
Photon flux (15-150 keV) in 80.00 sec: 0.826130 ( -0.06877 0.069104 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.81804e-06 ( -3.76272e-07 3.77248e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.704 sec. to 72.296 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23246 ( -0.571006 0.451137 )
Epeak [keV] : 116.735 ( -47.5338 9883.26 )
Norm@50keV : 9.520250E-03 ( -3.401486E-03 7.717182E-03) )
------------------------------------------------------------
Chi-Squared = 43.84436 using 59 PHA bins.
but latest trial 48.7131 gives Chi-Squared = 24.8799
Reduced chi-squared = 0.7829350 for 56 degrees of freedom
Null hypothesis probability = 0.881
Photon flux (15-150 keV) in 80.00 sec: 0.811693 ( -0.071607 0.07192 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.76452e-06 ( -3.89296e-07 3.87744e-07 ) ergs/cm2
Band function
Time interval is from -7.704 sec. to 72.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.23388 ( -0.449710 0.572490 )
beta : -9.17297 ( -0.827028 7.66613 )
Epeak [keV] : 116.861 ( -41.5175 9883.14 )
Norm@50keV : 9.507015E-03 ( -3.389475E-03 7.731445E-03) )
------------------------------------------------------------
Chi-Squared = 43.84436 using 59 PHA bins.
Reduced chi-squared = 0.7971702 for 55 degrees of freedom
Null hypothesis probability = 0.860
Photon flux (15-150 keV) in 80.00 sec: 0.811687 ( -0.071637 0.071959 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.761e-06 ( -3.8972e-07 3.86968e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 24.296 sec. to 40.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65697 ( -0.216089 0.219163 )
Norm@50keV : 9.129791E-03 ( -1.109555E-03 1.104875E-03) )
------------------------------------------------------------
Chi-Squared = 38.60798 using 59 PHA bins.
Reduced chi-squared = 0.6773329 for 57 degrees of freedom
Null hypothesis probability = 0.971
Photon flux (15-150 keV) in 16.00 sec: 1.19488 ( -0.15582 0.15682 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35794e-06 ( -1.71421e-07 1.71315e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 24.296 sec. to 40.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65527 ( -0.217486 0.220380 )
Epeak [keV] : 9990.76 ( -9990.75 9.23633 )
Norm@50keV : 9.149107E-03 ( -1.114306E-03 1.109007E-03) )
------------------------------------------------------------
Chi-Squared = 38.61352 using 59 PHA bins.
Reduced chi-squared = 0.6895271 for 56 degrees of freedom
Null hypothesis probability = 0.963
Photon flux (15-150 keV) in 16.00 sec: 1.19440 ( -0.15576 0.15676 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35797e-06 ( -1.71086e-07 1.71758e-07 ) ergs/cm2
Band function
Time interval is from 24.296 sec. to 40.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33361 ( -8.66640 6.33361 )
beta : -1.65694 ( -0.223154 0.216233 )
Epeak [keV] : 24.3873 ( -24.2873 9975.61 )
Norm@50keV : 2.010627E-02 ( -1.121128E-02 4.18266 )
------------------------------------------------------------
Chi-Squared = 38.60798 using 59 PHA bins.
Reduced chi-squared = 0.7019633 for 55 degrees of freedom
Null hypothesis probability = 0.954
Photon flux (15-150 keV) in 16.00 sec: 1.19304 ( -0.14279 0.14583 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.53682e-06 ( -6.50336e-07 5.93312e-07 ) ergs/cm2
Plot creation:
Wed Mar 19 10:45:43 EDT 2008