batgrbproduct Analysis for Trigger=306617
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): Tue Mar 18 05:56:47 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger306617/GCN5_download_cron
======================================================================
Trigger: 00306617 Segment: 000
BAT Trigger Time: 227490424 [s; MET]
Trigger Stop: 227490488 [s; MET]
UTC: 2008-03-17T23:47:01.349320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.480037507803 Dec: -15.0722591902521 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 21.98
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 21.98
Flight Position: [ source = BAT ]
RA: 244.480037507803 Dec: -15.0722591902521 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.489031719515 Dec: -15.0885837352773 [deg; J2000]
{ 16h 17m 57.4s , -15d 05' 18.9" }
+/- 1.05882956399078 [arcmin] (estimated 90% radius based on SNR)
+/- 0.343968453533202 [arcmin] (formal 1-sigma fit error)
SNR: 28.0319029916599
RA = 16h 17m 57.4s (244.489032 deg.)
Dec = -15d 5' 19" (-15.088584 deg.)
Angular difference between Flight and Ground position is 1.109450 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.920688 0.183091 -0.002965 -0.007127
0.041553 0.036411 0.031347 0.027175 [error]
Peak 1.920688 0.183091 -0.002965 -0.007127
0.041553 0.036411 0.031347 0.027175 [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 5.64e-07 7.55e-08 4.47e-09 2.80e-10 6.44e-07 6.44e-07 erg/cm2
Error 6.29e-08 1.61e-08 2.37e-09 2.60e-10 6.44e-08 6.44e-08 erg/cm2
Peak flux Power-law 3.11e-01 2.44e-02 7.23e-04 2.20e-05 3.36e-01 3.36e-01 ph/cm2/s
Error 3.59e-02 4.96e-03 3.73e-04 2.46e-05 3.59e-02 3.59e-02 ph/cm2/s
Fluence Cutoff-PL 5.70e-07 6.27e-08 6.33e-10 2.71e-13 6.34e-07 6.34e-07 erg/cm2
Error 6.62e-08 2.31e-08 3.18e-09 2.49e-10 4.99e-08 6.64e-08 erg/cm2
Peak flux Cutoff-PL 3.11e-01 2.44e-02 7.21e-04 2.19e-05 3.36e-01 3.36e-01 ph/cm2/s
Error 3.59e-02 4.96e-03 3.72e-04 2.44e-05 3.58e-02 3.58e-02 ph/cm2/s
Fluence Band 5.55e-07 7.57e-08 4.58e-09 2.98e-10 6.45e-07 4.37e-07 erg/cm2
Error 5.50e-08 1.06e-08 6.48e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 3.11e-01 2.44e-02 7.21e-04 1.75e-06 3.35e-01 3.36e-01 ph/cm2/s
Error 3.59e-02 4.96e-03 1.45e-05 3.60e-02 3.58e-02 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.040 0.455 - - 7.82e-05 3.27e-05 46.651 57
CPL 1.760 0.000 1.2 5.1 2.81e-01 2.08e+02 45.689 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.040 0.455 - - 7.82e-05 3.27e-05 46.651 57
CPL 1.760 1.500 1.2 0.0 2.81e-01 2.13e+02 45.689 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.4890 -15.0886 0.0069 0.2 137.3 2.0856 28.0 TRIG_00306617
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.03953 ( -0.412779 0.497327 )
Norm@50keV : 7.823208E-05 ( -2.974524E-05 3.557358E-05) )
------------------------------------------------------------
Chi-Squared = 46.65144 using 59 PHA bins.
Reduced chi-squared = 0.8184463 for 57 degrees of freedom
Null hypothesis probability = 0.834
Photon flux (15-150 keV) in 64.00 sec: 0.336192 ( -0.035851 0.03593 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.43802e-07 ( -6.43494e-08 6.44928e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75965 ( )
Epeak [keV] : 1.15164 ( -0.671586 9.45928 )
Norm@50keV : 0.280952 ( -0.122459 415.452 )
------------------------------------------------------------
Chi-Squared = 45.68903 using 59 PHA bins.
but latest trial -1.22393 gives Chi-Squared = 0.268742
Reduced chi-squared = 0.8158755 for 56 degrees of freedom
Null hypothesis probability = 0.836
Photon flux (15-150 keV) in 64.00 sec: 0.335766 ( -0.035786 0.035862 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.33529e-07 ( -3.35821e-08 6.62918e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.24306 ( -0.756943 1.59148 )
beta : -6.07663 ( -0.458492 0.448369 )
Epeak [keV] : 247.100 ( -247.000 9752.90 )
Norm@50keV : 1.028015E-02 ( -3.681829E-03 5.166966E-03) )
------------------------------------------------------------
Chi-Squared = 46.63324 using 59 PHA bins.
Reduced chi-squared = 0.8478770 for 55 degrees of freedom
Null hypothesis probability = 0.782
Photon flux (15-150 keV) in 64.00 sec: 0.334651 ( -0.035366 0.0367 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.44922e-07 ( -6.30182e-08 6.6496e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.03953 ( -0.412779 0.497327 )
Norm@50keV : 7.823208E-05 ( -2.974524E-05 3.557358E-05) )
------------------------------------------------------------
Chi-Squared = 46.65144 using 59 PHA bins.
Reduced chi-squared = 0.8184463 for 57 degrees of freedom
Null hypothesis probability = 0.834
Photon flux (15-150 keV) in 64.00 sec: 0.336192 ( -0.035851 0.03593 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.43802e-07 ( -6.43494e-08 6.44928e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75965 ( -0.862776 2.13734 )
Epeak [keV] : 1.15164 ( )
Norm@50keV : 0.280952 ( -9.785711E-02 425.887 )
------------------------------------------------------------
Chi-Squared = 45.68903 using 59 PHA bins.
Reduced chi-squared = 0.8158755 for 56 degrees of freedom
Null hypothesis probability = 0.836
Photon flux (15-150 keV) in 64.00 sec: 0.335766 ( -0.035786 0.035862 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.33529e-07 ( -3.35821e-08 6.62918e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.24306 ( -0.756943 1.70832 )
beta : -6.07663 ( -0.458492 0.448369 )
Epeak [keV] : 247.100 ( -247.000 9752.90 )
Norm@50keV : 1.028015E-02 ( -3.681829E-03 5.166966E-03) )
------------------------------------------------------------
Chi-Squared = 46.63324 using 59 PHA bins.
Reduced chi-squared = 0.8478770 for 55 degrees of freedom
Null hypothesis probability = 0.782
Photon flux (15-150 keV) in 64.00 sec: 0.334651 ( -0.035366 0.0367 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.44922e-07 ( -6.30182e-08 6.6496e-08 ) ergs/cm2
Plot creation:
Tue Mar 18 06:06:31 EDT 2008