batgrbproduct Analysis for Trigger=304379
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): Fri Feb 29 20:44:30 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger304379/GCN5_download_cron
======================================================================
Trigger: 00304379 Segment: 000
BAT Trigger Time: 225997502.144 [s; MET]
Trigger Stop: 225997503.168 [s; MET]
UTC: 2008-02-29T17:04:59.534140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 228.216781802381 Dec: -14.7122099614831 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.25
Image Trigger?: NO
Rate S/N Ratio: 25.4558441227157 [ if not an image trigger ]
Image S/N Ratio: 10.25
Flight Position: [ source = BAT ]
RA: 228.216781802381 Dec: -14.7122099614831 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 228.219408074006 Dec: -14.6958226052628 [deg; J2000]
{ 15h 12m 52.7s , -14d 41' 45.0" }
+/- 1.5012159420643 [arcmin] (estimated 90% radius based on SNR)
+/- 0.836320140793169 [arcmin] (formal 1-sigma fit error)
SNR: 17.0238079716008
RA = 15h 12m 52.7s (228.219408 deg.)
Dec = -14d 41' 45" (-14.695823 deg.)
Angular difference between Flight and Ground position is 0.994984 arcmin
Partial Coding Fraction: 0.1875 [ including projection effects ]
Duration
T90: 64 +/- 16
Measured from: -15.1439999938011
to: 48.8560000061989 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: 16.8560000061989
to: 32.8560000061989 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 40.3560000061989
to: 41.3560000061989 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.1439999938011
to: 80.8560000061989 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.065542 5.720755 3.425409 0.874853
0.103819 0.105477 0.092313 0.074951 [error]
Peak 3.349250 3.662155 1.933030 0.361019
0.047847 0.049043 0.041103 0.027769 [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 1.85e-06 2.66e-06 2.85e-06 5.67e-06 9.12e-06 1.30e-05 erg/cm2
Error 1.02e-07 8.08e-08 1.01e-07 4.66e-07 2.44e-07 5.14e-07 erg/cm2
Peak flux Power-law 2.63e+00 1.90e+00 9.13e-01 6.18e-01 5.74e+00 6.06e+00 ph/cm2/s
Error 1.23e-01 5.07e-02 2.51e-02 3.73e-02 1.67e-01 1.60e-01 ph/cm2/s
Fluence Cutoff-PL 1.85e-06 2.66e-06 2.85e-06 5.63e-06 9.12e-06 1.30e-05 erg/cm2
Error 1.02e-07 8.08e-08 1.01e-07 4.63e-07 2.68e-07 5.11e-07 erg/cm2
Peak flux Cutoff-PL 2.49e+00 1.91e+00 9.28e-01 5.19e-01 5.61e+00 5.85e+00 ph/cm2/s
Error 1.74e-01 5.20e-02 2.91e-02 8.66e-02 2.01e-01 2.42e-01 ph/cm2/s
Fluence Band 1.79e-06 2.67e-06 2.84e-06 5.49e-06 9.05e-06 1.28e-05 erg/cm2
Error 1.32e-07 9.29e-08 8.32e-08 1.00e-06 2.96e-07 6.91e-07 erg/cm2
Peak flux Band 2.39e+00 1.93e+00 9.20e-01 5.66e-01 5.52e+00 5.81e+00 ph/cm2/s
Error 2.17e-01 5.62e-02 2.92e-02 5.92e-02 2.32e-01 2.41e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.902 0.055 - - 1.03e-02 2.77e-04 32.864 57
CPL 1.884 0.219 338.9 5000.0 1.05e-02 1.62e-03 32.844 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.060 0.045 - - 3.72e-02 8.25e-04 28.231 57
CPL 1.863 0.144 37.9 25.2 4.57e-02 7.25e-03 24.996 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: 42.752000 sec.
T50 in the 50-300 keV band: 20.800000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 96.000 -15.144 80.856
T90 64.000 -15.144 48.856
T50 16.000 16.856 32.856
Peak 1.000 40.356 41.356
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
228.2194 -14.6958 0.0112 39.7 -63.8 2.6078 17.0 TRIG_00304379
------------------------------------------
Foreground time interval of the image:
-15.144 14.657 (delta_t = 29.801 [sec])
Background time interval of the image:
-239.144 -148.614 (delta_t = 90.530 [sec])
-147.144 -15.144 (delta_t = 132.000 [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 -15.144 sec. to 80.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90178 ( -5.511153E-02 5.541122E-02) )
Norm@50keV : 1.032771E-02 ( -2.776161E-04 2.772864E-04) )
------------------------------------------------------------
Chi-Squared = 32.86370 using 59 PHA bins.
Reduced chi-squared = 0.5765561 for 57 degrees of freedom
Null hypothesis probability = 0.996
Photon flux (15-150 keV) in 96.00 sec: 1.48325 ( -0.04846 0.04886 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.11534e-06 ( -2.4408e-07 2.44186e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.144 sec. to 80.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88405 ( -0.224691 0.213362 )
Epeak [keV] : 338.884 ( -338.874 9661.12 )
Norm@50keV : 1.052499E-02 ( -4.677717E-04 2.768843E-03) )
------------------------------------------------------------
Chi-Squared = 32.84409 using 59 PHA bins.
Reduced chi-squared = 0.5865017 for 56 degrees of freedom
Null hypothesis probability = 0.994
Photon flux (15-150 keV) in 96.00 sec: 1.48218 ( -0.04842 0.04883 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.11563e-06 ( -2.9375e-07 2.42179e-07 ) ergs/cm2
Band function
Time interval is from -15.144 sec. to 80.856 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.56765 ( -8.43235 2.63573 )
beta : -1.90517 ( -8.09483 5.751491E-02) )
Epeak [keV] : 33.0192 ( -280.073 9719.83 )
Norm@50keV : 1.811285E-02 ( -4.944270E-04 5462.28 )
------------------------------------------------------------
Chi-Squared = 32.87026 using 59 PHA bins.
Reduced chi-squared = 0.5976411 for 55 degrees of freedom
Null hypothesis probability = 0.992
Photon flux (15-150 keV) in 96.00 sec: 1.46901 ( -0.0648 0.05625 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.04974e-06 ( -2.89795e-07 3.02448e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 32.856 sec. to 48.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06029 ( -4.510498E-02 4.532003E-02) )
Norm@50keV : 3.719104E-02 ( -8.250698E-04 8.248240E-04) )
------------------------------------------------------------
Chi-Squared = 28.23062 using 59 PHA bins.
Reduced chi-squared = 0.4952739 for 57 degrees of freedom
Null hypothesis probability = 1.000
Photon flux (15-150 keV) in 16.00 sec: 5.73904 ( -0.16649 0.16799 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.50941e-06 ( -1.21456e-07 1.21456e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 32.856 sec. to 48.856 sec.
Photon index: 1.86286 ( -0.194704 9.398544E-02) )
Epeak [keV] : 37.9387 ( -36.9329 13.4248 )
Norm@50keV : 4.573600E-02 ( -4.377495E-03 1.011523E-02) )
------------------------------------------------------------
Chi-Squared = 24.99622 using 59 PHA bins.
but latest trial 2.03132 gives Chi-Squared = 4.36809
but latest trial 2.09835 gives Chi-Squared = 1.46249
but latest trial 3.793203E-02 gives Chi-Squared = 5.47770
Reduced chi-squared = 0.4463611 for 56 degrees of freedom
Null hypothesis probability = 1.000
Photon flux (15-150 keV) in 16.00 sec: 5.60905 ( -0.2018 0.20088 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.42978e-06 ( -1.19456e-07 1.19648e-07 ) ergs/cm2
Band function
Time interval is from 32.856 sec. to 48.856 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51655 ( -0.260902 0.627979 )
beta : -2.16826 ( -7.83142 9.702301E-02) )
Epeak [keV] : 39.4105 ( -18.7599 8.65200 )
Norm@50keV : 7.130456E-02 ( -1.573838E-02 8.231495E-02) )
------------------------------------------------------------
Chi-Squared = 23.03677 using 59 PHA bins.
Reduced chi-squared = 0.4188503 for 55 degrees of freedom
Null hypothesis probability = 1.000
Photon flux (15-150 keV) in 16.00 sec: 5.51913 ( -0.23344 0.23009 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.42205e-06 ( -1.43296e-07 1.42288e-07 ) ergs/cm2
Plot creation:
Fri Feb 29 21:28:19 EST 2008