batgrbproduct Analysis for Trigger=204415
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): Mon Dec 31 17:37:57 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger204415/GCN5_download_cron
======================================================================
Trigger: 00204415 Segment: 000
BAT Trigger Time: 166194944 [s; MET]
Trigger Stop: 166195008 [s; MET]
UTC: 2006-04-08T13:15:42.879600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 278.942251793228 Dec: -33.1191252818558 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.63
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.63
Flight Position: [ source = BAT ]
RA: 278.942251793228 Dec: -33.1191252818558 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 278.908685593314 Dec: -33.1057524516443 [deg; J2000]
{ 18h 35m 38.1s , -33d 06' 20.7" }
+/- 4.14500213787919 [arcmin] (estimated 90% radius based on SNR)
+/- 2.97109654330668 [arcmin] (formal 1-sigma fit error)
SNR: 3.98969919407051
RA = 18h 35m 38.1s (278.908686 deg.)
Dec = -33d 6' 21" (-33.105752 deg.)
Angular difference between Flight and Ground position is 1.868004 arcmin
Partial Coding Fraction: 0.84375 [ 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 0.133402 0.086907 -0.033511 -0.026829
0.036324 0.032757 0.027800 0.023194 [error]
Peak 0.133402 0.086907 -0.033511 -0.026829
0.036324 0.032757 0.027800 0.023194 [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 3.61e-08 2.54e-08 1.18e-08 7.61e-09 7.68e-08 8.01e-08 erg/cm2
Error 1.70e-08 1.59e-08 1.43e-08 2.09e-08 4.34e-08 5.32e-08 erg/cm2
Peak flux Power-law 3.64e-02 1.44e-02 3.34e-03 9.36e-04 5.47e-02 5.52e-02 ph/cm2/s
Error 1.74e-02 8.71e-03 4.18e-03 2.32e-03 2.49e-02 2.54e-02 ph/cm2/s
Fluence Cutoff-PL 3.70e-08 3.26e-08 3.05e-09 7.52e-12 7.27e-08 7.27e-08 erg/cm2
Error 1.93e-08 2.30e-08 1.10e-08 8.11e-09 3.47e-08 3.49e-08 erg/cm2
Peak flux Cutoff-PL 3.64e-02 1.44e-02 3.34e-03 9.30e-04 5.47e-02 5.50e-02 ph/cm2/s
Error 1.74e-02 8.71e-03 4.18e-03 2.30e-03 2.51e-02 2.54e-02 ph/cm2/s
Fluence Band 3.68e-08 2.64e-08 1.21e-08 7.81e-09 7.95e-08 1.26e-07 erg/cm2
Error 1.70e-08 1.41e-08 1.09e-08 1.79e-08 3.99e-08 0.00e+00 erg/cm2
Peak flux Band 3.60e-02 1.89e-02 1.89e-03 2.09e-05 5.69e-02 5.45e-02 ph/cm2/s
Error 1.44e-02 1.49e-02 2.50e-03 1.38e-03 2.41e-02 2.43e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.053 1.143 - - 1.92e-04 1.88e-04 65.122 57
CPL -0.410 2.307 20.2 14.8 5.58e-02 1.33e+00 63.237 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.053 1.143 - - 1.92e-04 1.88e-04 65.122 57
CPL -0.410 2.593 20.2 14.8 5.58e-02 1.33e+00 63.237 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
278.9087 -33.1058 0.0482 28.4 -7.5 0.2627 4.0 TRIG_00204415
------------------------------------------
Foreground time interval of the image:
0.000 33.088 (delta_t = 33.088 [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 33.088 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.05344 ( -0.848390 1.43685 )
Norm@50keV : 1.920973E-04 ( -1.920973E-04 1.839677E-04) )
------------------------------------------------------------
Chi-Squared = 65.12184 using 59 PHA bins.
Reduced chi-squared = 1.142488 for 57 degrees of freedom
Null hypothesis probability = 0.215
Photon flux (15-150 keV) in 33.09 sec: 5.471048E-02 ( -0.0246574 0.0251656 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.68396e-08 ( -3.9521e-08 4.7325e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.088 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.409552 ( -2.59045 2.02416 )
Epeak [keV] : 20.1780 ( -17.5756 12.0998 )
Norm@50keV : 5.582695E-02 ( -5.582695E-02 2.59730 )
------------------------------------------------------------
Chi-Squared = 63.23686 using 59 PHA bins.
but latest trial 2.60240 gives Chi-Squared = 14.0205
Reduced chi-squared = 1.129230 for 56 degrees of freedom
Null hypothesis probability = 0.236
Photon flux (15-150 keV) in 33.09 sec: 5.469644E-02 ( -0.0249416 0.0251585 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.26938e-08 ( -3.25731e-08 3.67607e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.088 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59302 ( -10.6883 4.31167 )
beta : -8.93033 ( -0.628330 19.3715 )
Epeak [keV] : 6.52617 ( -19.2805 13.0558 )
Norm@50keV : 2.852851E-03 ( -0.100413 253.413 )
------------------------------------------------------------
Chi-Squared = 63.98194 using 59 PHA bins.
Reduced chi-squared = 1.163308 for 55 degrees of freedom
Null hypothesis probability = 0.190
Photon flux (15-150 keV) in 33.09 sec: 5.685562E-02 ( -0.0241153 0.0241154 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.95388e-08 ( -3.9566e-08 4.02196e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.088 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.05344 ( -0.848390 1.43685 )
Norm@50keV : 1.920973E-04 ( -1.920973E-04 1.839677E-04) )
------------------------------------------------------------
Chi-Squared = 65.12184 using 59 PHA bins.
Reduced chi-squared = 1.142488 for 57 degrees of freedom
Null hypothesis probability = 0.215
Photon flux (15-150 keV) in 33.09 sec: 5.471048E-02 ( -0.0246574 0.0251656 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.68396e-08 ( -3.9521e-08 4.7325e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.088 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.409552 ( -2.59045 2.59535 )
Epeak [keV] : 20.1780 ( -17.5756 12.0998 )
Norm@50keV : 5.582695E-02 ( -5.582695E-02 2.59730 )
------------------------------------------------------------
Chi-Squared = 63.23686 using 59 PHA bins.
but latest trial 2.60240 gives Chi-Squared = 14.0205
Reduced chi-squared = 1.129230 for 56 degrees of freedom
Null hypothesis probability = 0.236
Photon flux (15-150 keV) in 33.09 sec: 5.469644E-02 ( -0.0249416 0.0251585 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.26938e-08 ( -3.25731e-08 3.67607e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.088 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59302 ( -10.6883 4.31167 )
beta : -8.93033 ( -0.628330 19.3717 )
Epeak [keV] : 6.52617 ( -19.2805 13.0558 )
Norm@50keV : 2.852851E-03 ( -0.100413 253.413 )
------------------------------------------------------------
Chi-Squared = 63.98194 using 59 PHA bins.
Reduced chi-squared = 1.163308 for 55 degrees of freedom
Null hypothesis probability = 0.190
Photon flux (15-150 keV) in 33.09 sec: 5.685562E-02 ( -0.0241153 0.0241154 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.95388e-08 ( -3.9566e-08 4.02196e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 17:48:23 EST 2007