batgrbproduct Analysis for Trigger=216664
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 Jan 1 19:21:20 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger216664/GCN5_download_cron
======================================================================
Trigger: 00216664 Segment: 000
BAT Trigger Time: 173472335.168 [s; MET]
Trigger Stop: 173472339.264 [s; MET]
UTC: 2006-07-01T18:45:33.877680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 263.327461827525 Dec: -33.4461252920544 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.27
Image Trigger?: NO
Rate S/N Ratio: 5.29150262212918 [ if not an image trigger ]
Image S/N Ratio: 5.27
Flight Position: [ source = BAT ]
RA: 263.327461827525 Dec: -33.4461252920544 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 263.336843941406 Dec: -33.3694895846013 [deg; J2000]
{ 17h 33m 20.8s , -33d 22' 10.2" }
+/- 3.92210921553903 [arcmin] (estimated 90% radius based on SNR)
+/- 2.47922726187237 [arcmin] (formal 1-sigma fit error)
SNR: 4.31750767910685
RA = 17h 33m 20.8s (263.336844 deg.)
Dec = -33d 22' 10" (-33.369490 deg.)
Angular difference between Flight and Ground position is 4.622092 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 4.0959999859333 +/-
Measured from: 0
to: 4.0959999859333 [s; relative to TRIGTIME]
T50: 4.0959999859333 +/-
Measured from: 0
to: 4.0959999859333 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 4.0959999859333 second)
Measured from: 1.49011611938477e-08
to: 4.09600000083447 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 4.0959999859333 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.075014 -0.017665 0.000671 0.002260
0.014188 0.011092 0.009317 0.007956 [error]
Peak 0.075014 -0.017665 0.000671 0.002260
0.014188 0.011092 0.009317 0.007956 [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 1.84e-08 2.21e-09 1.13e-10 6.11e-12 2.07e-08 2.07e-08 erg/cm2
Error 7.12e-09 2.97e-09 4.45e-10 7.82e-11 9.48e-09 9.49e-09 erg/cm2
Peak flux Power-law 1.59e-01 1.12e-02 2.88e-04 7.58e-06 1.71e-01 1.71e-01 ph/cm2/s
Error 5.93e-02 1.44e-02 1.08e-03 8.91e-05 6.92e-02 6.92e-02 ph/cm2/s
Fluence Cutoff-PL 1.84e-08 2.21e-09 1.13e-10 6.06e-12 2.07e-08 2.07e-08 erg/cm2
Error 7.12e-09 2.96e-09 4.44e-10 7.76e-11 9.49e-09 9.50e-09 erg/cm2
Peak flux Cutoff-PL 1.59e-01 1.12e-02 2.87e-04 7.51e-06 1.70e-01 1.70e-01 ph/cm2/s
Error 5.93e-02 1.44e-02 1.08e-03 8.84e-05 6.92e-02 6.92e-02 ph/cm2/s
Fluence Band 1.81e-08 1.85e-09 7.74e-11 2.45e-12 2.18e-08 2.03e-08 erg/cm2
Error 6.65e-09 2.15e-09 8.70e-10 9.34e-09 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.59e-01 1.09e-02 2.75e-04 6.22e-06 1.76e-01 1.69e-01 ph/cm2/s
Error 5.85e-02 1.24e-02 8.26e-04 7.29e-05 8.04e-02 6.55e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.284 2.040 - - 3.11e-05 8.68e-05 54.442 57
CPL 1.252 0.000 2.8 23.9 7.29e-01 0.00e+00 53.494 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.284 2.040 - - 3.11e-05 8.68e-05 54.442 57
CPL 1.252 0.000 2.8 23.9 7.29e-01 0.00e+00 53.494 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 4.096 0.000 4.096
T90 4.096 0.000 4.096
T50 4.096 0.000 4.096
Peak 4.096 0.000 4.096
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
263.3368 -33.3695 0.0444 14.3 83.8 0.0919 4.3 TRIG_00216664
------------------------------------------
Foreground time interval of the image:
0.000 4.096 (delta_t = 4.096 [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 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.28418 ( -1.60275 2.47790 )
Norm@50keV : 3.111255E-05 ( -3.111256E-05 1.424019E-04) )
------------------------------------------------------------
Chi-Squared = 54.44159 using 59 PHA bins.
Reduced chi-squared = 0.9551156 for 57 degrees of freedom
Null hypothesis probability = 0.572
Photon flux (15-150 keV) in 4.096 sec: 0.170572 ( -0.069185 0.069255 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07051e-08 ( -9.08624e-09 9.8834e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25236 ( )
Epeak [keV] : 2.81016 ( -6.63204 41.1638 )
Norm@50keV : 0.729319 ( )
------------------------------------------------------------
Chi-Squared = 53.49414 using 59 PHA bins.
but latest trial 35.6187 gives Chi-Squared = 22.4456
Reduced chi-squared = 0.9552526 for 56 degrees of freedom
Null hypothesis probability = 0.570
Photon flux (15-150 keV) in 4.096 sec: 0.170349 ( -0.069172 0.069237 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07001e-08 ( -9.09939e-09 9.87611e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.18561 ( -0.814395 14.1856 )
beta : -6.29231 ( -2.47278 1.61286 )
Epeak [keV] : 441.257 ( -441.157 9558.74 )
Norm@50keV : 4.189785E-03 ( -4.189785E-03 1.941473E-02) )
------------------------------------------------------------
Chi-Squared = 54.44167 using 59 PHA bins.
Reduced chi-squared = 0.9898486 for 55 degrees of freedom
Null hypothesis probability = 0.496
Photon flux (15-150 keV) in 4.096 sec: 0.176221 ( -0.070556 0.090313 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18046e-08 ( -9.23996e-09 9.44865e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.28418 ( -1.60275 2.47790 )
Norm@50keV : 3.111255E-05 ( -3.111256E-05 1.424019E-04) )
------------------------------------------------------------
Chi-Squared = 54.44159 using 59 PHA bins.
Reduced chi-squared = 0.9551156 for 57 degrees of freedom
Null hypothesis probability = 0.572
Photon flux (15-150 keV) in 4.096 sec: 0.170572 ( -0.069185 0.069255 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07051e-08 ( -9.08624e-09 9.8834e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25236 ( )
Epeak [keV] : 2.81016 ( -6.63204 41.1638 )
Norm@50keV : 0.729319 ( )
------------------------------------------------------------
Chi-Squared = 53.49414 using 59 PHA bins.
but latest trial 35.6187 gives Chi-Squared = 22.4456
Reduced chi-squared = 0.9552526 for 56 degrees of freedom
Null hypothesis probability = 0.570
Photon flux (15-150 keV) in 4.096 sec: 0.170349 ( -0.069172 0.069237 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07001e-08 ( -9.09939e-09 9.87611e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.18561 ( -0.814395 14.1856 )
beta : -6.29231 ( -2.47278 1.61286 )
Epeak [keV] : 441.257 ( -441.157 9558.74 )
Norm@50keV : 4.189785E-03 ( -4.189785E-03 1.941473E-02) )
------------------------------------------------------------
Chi-Squared = 54.44167 using 59 PHA bins.
Reduced chi-squared = 0.9898486 for 55 degrees of freedom
Null hypothesis probability = 0.496
Photon flux (15-150 keV) in 4.096 sec: 0.176221 ( -0.070556 0.090313 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18046e-08 ( -9.23996e-09 9.44865e-09 ) ergs/cm2
Plot creation:
Tue Jan 1 19:24:52 EST 2008