batgrbproduct Analysis for Trigger=302778
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 8 17:54:56 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger302778/GCN5_download_cron
======================================================================
Trigger: 00302778 Segment: 000
BAT Trigger Time: 224170368 [s; MET]
Trigger Stop: 224170432 [s; MET]
UTC: 2008-02-08T13:32:45.439960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 242.006365844815 Dec: -19.822164576864 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 22.93
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 22.93
Flight Position: [ source = BAT ]
RA: 242.006365844815 Dec: -19.822164576864 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 242.005107823105 Dec: -19.8256018990487 [deg; J2000]
{ 16h 08m 01.2s , -19d 49' 32.2" }
+/- 0.938030974412866 [arcmin] (estimated 90% radius based on SNR)
+/- 0.245804063004081 [arcmin] (formal 1-sigma fit error)
SNR: 33.3279133772077
RA = 16h 8m 1.2s (242.005108 deg.)
Dec = -19d 49' 32" (-19.825602 deg.)
Angular difference between Flight and Ground position is 0.218121 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 2.957090 0.222657 0.004674 -0.022136
0.049964 0.043271 0.038673 0.036707 [error]
Peak 2.957090 0.222657 0.004674 -0.022136
0.049964 0.043271 0.038673 0.036707 [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 8.75e-07 1.03e-07 5.17e-09 2.72e-10 9.83e-07 9.83e-07 erg/cm2
Error 9.38e-08 1.92e-08 2.44e-09 2.23e-10 9.39e-08 9.39e-08 erg/cm2
Peak flux Power-law 4.85e-01 3.35e-02 8.41e-04 2.16e-05 5.19e-01 5.19e-01 ph/cm2/s
Error 5.39e-02 5.95e-03 3.86e-04 2.24e-05 5.35e-02 5.35e-02 ph/cm2/s
Fluence Cutoff-PL 8.74e-07 1.03e-07 5.16e-09 2.70e-10 9.82e-07 9.82e-07 erg/cm2
Error 9.37e-08 1.92e-08 2.43e-09 2.22e-10 9.39e-08 9.38e-08 erg/cm2
Peak flux Cutoff-PL 4.83e-01 2.86e-02 9.12e-05 5.72e-09 5.11e-01 5.19e-01 ph/cm2/s
Error 5.75e-02 7.48e-03 4.33e-04 7.97e-06 5.71e-02 6.57e-02 ph/cm2/s
Fluence Band 8.58e-07 1.03e-07 3.93e-09 1.60e-10 9.93e-07 9.68e-07 erg/cm2
Error 8.89e-08 1.48e-08 1.73e-11 9.85e-08 8.90e-08 0.00e+00 erg/cm2
Peak flux Band 4.85e-01 3.10e-02 3.01e-04 1.81e-06 5.16e-01 5.16e-01 ph/cm2/s
Error 5.45e-02 5.96e-03 3.89e-04 1.42e-05 4.11e-02 5.01e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.315 0.414 - - 9.17e-05 3.53e-05 48.523 57
CPL 1.721 0.000 1.3 4.7 5.21e-01 1.22e+02 46.097 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.315 0.414 - - 9.17e-05 3.53e-05 48.523 57
CPL 1.721 0.000 1.3 0.0 5.21e-01 2.09e-01 46.097 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 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
242.0051 -19.8256 0.0058 0.2 -64.7 3.1427 33.3 TRIG_00302778
------------------------------------------
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: 6.31520 ( -0.411336 0.417594 )
Norm@50keV : 9.170874E-05 ( -2.992498E-05 4.070476E-05) )
------------------------------------------------------------
Chi-Squared = 48.52350 using 59 PHA bins.
Reduced chi-squared = 0.8512895 for 57 degrees of freedom
Null hypothesis probability = 0.780
Photon flux (15-150 keV) in 64.00 sec: 0.518951 ( -0.053375 0.053612 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.82995e-07 ( -9.376e-08 9.41376e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Photon index: 1.72071 ( )
Epeak [keV] : 1.28564 ( -0.714800 8.66973 )
Norm@50keV : 0.521275 ( -0.209528 243.611 )
------------------------------------------------------------
Chi-Squared = 46.09724 using 59 PHA bins.
but latest trial 0.747455 gives Chi-Squared = 274.968
but latest trial -1.23741 gives Chi-Squared = 0.103447
but latest trial 9.47666 gives Chi-Squared = 2.68715
Reduced chi-squared = 0.8231650 for 56 degrees of freedom
Null hypothesis probability = 0.825
Photon flux (15-150 keV) in 64.00 sec: 0.511234 ( -0.057535 0.056647 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.82202e-07 ( -9.36256e-08 9.41248e-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 : -9.29642 ( -0.703581 1.30199 )
beta : -6.31563 ( -0.417337 0.411791 )
Epeak [keV] : 234.830 ( -234.730 9765.17 )
Norm@50keV : 1.246079E-02 ( -4.063778E-03 5.536089E-03) )
------------------------------------------------------------
Chi-Squared = 48.52349 using 59 PHA bins.
Reduced chi-squared = 0.8822454 for 55 degrees of freedom
Null hypothesis probability = 0.719
Photon flux (15-150 keV) in 64.00 sec: 0.516196 ( -0.053402 0.028791 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.92966e-07 ( -8.90304e-08 1.07872e-07 ) 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: 6.31520 ( -0.411336 0.417594 )
Norm@50keV : 9.170874E-05 ( -2.992498E-05 4.070476E-05) )
------------------------------------------------------------
Chi-Squared = 48.52350 using 59 PHA bins.
Reduced chi-squared = 0.8512895 for 57 degrees of freedom
Null hypothesis probability = 0.780
Photon flux (15-150 keV) in 64.00 sec: 0.518951 ( -0.053375 0.053612 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.82995e-07 ( -9.376e-08 9.41376e-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: 1.72071 ( )
Epeak [keV] : 1.28564 ( )
Norm@50keV : 0.521275 ( -0.152500 0.264788 )
------------------------------------------------------------
Chi-Squared = 46.09724 using 59 PHA bins.
but latest trial 0.747455 gives Chi-Squared = 274.968
Reduced chi-squared = 0.8231650 for 56 degrees of freedom
Null hypothesis probability = 0.825
Photon flux (15-150 keV) in 64.00 sec: 0.511234 ( -0.057535 0.056647 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.82202e-07 ( -9.36256e-08 9.41248e-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 : -9.29642 ( -0.703581 1.30199 )
beta : -6.31563 ( -0.417337 0.411791 )
Epeak [keV] : 234.830 ( -234.730 9765.17 )
Norm@50keV : 1.246079E-02 ( -4.063778E-03 5.536089E-03) )
------------------------------------------------------------
Chi-Squared = 48.52349 using 59 PHA bins.
Reduced chi-squared = 0.8822454 for 55 degrees of freedom
Null hypothesis probability = 0.719
Photon flux (15-150 keV) in 64.00 sec: 0.516196 ( -0.053402 0.028791 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.92966e-07 ( -8.90304e-08 1.07872e-07 ) ergs/cm2
Plot creation:
Fri Feb 8 18:02:27 EST 2008