batgrbproduct Analysis for Trigger=228006
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): Wed Jan 2 02:59:29 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger228006/GCN5_download_cron
======================================================================
Trigger: 00228006 Segment: 000
BAT Trigger Time: 179029865.28 [s; MET]
Trigger Stop: 179029865.792 [s; MET]
UTC: 2006-09-04T02:31:03.857720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 58.2130876183086 Dec: -0.720064748212814 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.68
Image Trigger?: NO
Rate S/N Ratio: 15.52417469626 [ if not an image trigger ]
Image S/N Ratio: 8.68
Flight Position: [ source = BAT ]
RA: 58.2130876183086 Dec: -0.720064748212814 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 58.218534801125 Dec: -0.725488045596521 [deg; J2000]
{ 03h 52m 52.4s , -00d 43' 31.8" }
+/- 0.914892313424495 [arcmin] (estimated 90% radius based on SNR)
+/- 0.321570336276019 [arcmin] (formal 1-sigma fit error)
SNR: 34.5385518672419
RA = 3h 52m 52.4s (58.218535 deg.)
Dec = 0d 43' 32" (-0.725488 deg.)
Angular difference between Flight and Ground position is 0.461178 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 171.467999994755 +/- 11.3430592104484
Measured from: 0.340000003576279
to: 171.807999998331 [s; relative to TRIGTIME]
T50: 38.1119999885559 +/- 107.807273459423
Measured from: 2.34400001168251
to: 40.4560000002384 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.15599998831749
to: 2.15599998831749 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.944000005722046
to: 183.50799998641 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.816099 1.059758 0.657224 0.169783
0.069521 0.070345 0.061929 0.054470 [error]
Peak 0.071598 0.101747 0.104214 0.025246
0.007794 0.008632 0.008169 0.006290 [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 2.60e-07 4.35e-07 5.54e-07 1.41e-06 1.64e-06 2.66e-06 erg/cm2
Error 3.38e-08 3.45e-08 6.13e-08 3.32e-07 1.45e-07 3.82e-07 erg/cm2
Peak flux Power-law 6.42e-01 7.74e-01 6.74e-01 1.01e+00 2.44e+00 3.10e+00 ph/cm2/s
Error 1.06e-01 7.71e-02 6.47e-02 2.08e-01 2.11e-01 2.72e-01 ph/cm2/s
Fluence Cutoff-PL 2.41e-07 4.58e-07 5.66e-07 6.86e-07 1.58e-06 1.95e-06 erg/cm2
Error 4.00e-08 4.41e-08 6.68e-08 5.81e-07 1.63e-07 6.23e-07 erg/cm2
Peak flux Cutoff-PL 6.18e-01 7.83e-01 6.89e-01 8.43e-01 2.43e+00 2.94e+00 ph/cm2/s
Error 1.31e-01 6.34e-02 7.99e-02 3.68e-01 2.60e-01 4.30e-01 ph/cm2/s
Fluence Band 2.39e-07 4.57e-07 5.64e-07 6.85e-07 1.58e-06 2.25e-06 erg/cm2
Error 3.96e-08 4.40e-08 6.67e-08 6.17e-07 1.63e-07 0.00e+00 erg/cm2
Peak flux Band 6.14e-01 7.84e-01 6.88e-01 9.03e-01 2.43e+00 2.97e+00 ph/cm2/s
Error 1.15e-01 8.39e-02 7.92e-02 1.78e-01 2.12e-01 2.74e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.652 0.142 - - 9.56e-04 7.87e-05 46.087 57
CPL 1.055 0.000 76.2 4970.8 1.94e-03 1.40e-03 43.971 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.199 0.148 - - 2.08e-02 1.73e-03 57.636 57
CPL 1.024 0.479 315.2 5000.0 2.51e-02 1.46e-02 57.385 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: 8.384000 sec.
T50 in the 50-300 keV band: 3.008000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 184.452 -0.944 183.508
T90 171.468 0.340 171.808
T50 38.112 2.344 40.456
Peak 1.000 1.156 2.156
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
58.2185 -0.7255 0.0056 26.2 67.7 1.5316 34.5 TRIG_00228006
------------------------------------------
Foreground time interval of the image:
-0.944 8.121 (delta_t = 9.065 [sec])
Background time interval of the image:
-239.280 -0.944 (delta_t = 238.336 [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 -0.944 sec. to 183.508 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65209 ( -0.140866 0.143082 )
Norm@50keV : 9.559715E-04 ( -7.903529E-05 7.836439E-05) )
------------------------------------------------------------
Chi-Squared = 46.08673 using 59 PHA bins.
Reduced chi-squared = 0.8085391 for 57 degrees of freedom
Null hypothesis probability = 0.849
Photon flux (15-150 keV) in 184.5 sec: 0.124912 ( -0.009903 0.00992 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.64034e-06 ( -1.44146e-07 1.44895e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.944 sec. to 183.508 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05524 ( )
Epeak [keV] : 76.2246 ( -29.7919 9911.89 )
Norm@50keV : 1.938828E-03 ( -6.473148E-04 2.160462E-03) )
------------------------------------------------------------
Chi-Squared = 43.97115 using 59 PHA bins.
Reduced chi-squared = 0.7851990 for 56 degrees of freedom
Null hypothesis probability = 0.878
Photon flux (15-150 keV) in 184.5 sec: 0.122027 ( -0.010469 0.010403 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57699e-06 ( -1.63264e-07 1.62283e-07 ) ergs/cm2
Band function
Time interval is from -0.944 sec. to 183.508 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10068 ( -0.613132 0.595631 )
beta : -9.18501 ( -0.814986 7.59313 )
Epeak [keV] : 78.6003 ( -20.2551 9921.40 )
Norm@50keV : 1.846447E-03 ( -1.846447E-03 1.868077E-03) )
------------------------------------------------------------
Chi-Squared = 43.90238 using 59 PHA bins.
Reduced chi-squared = 0.7982251 for 55 degrees of freedom
Null hypothesis probability = 0.859
Photon flux (15-150 keV) in 184.5 sec: 0.122035 ( -0.010487 0.010444 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57553e-06 ( -1.63068e-07 1.62712e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.156 sec. to 2.156 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19885 ( -0.149068 0.147824 )
Norm@50keV : 2.081756E-02 ( -1.734482E-03 1.734219E-03) )
------------------------------------------------------------
Chi-Squared = 57.63620 using 59 PHA bins.
Reduced chi-squared = 1.011161 for 57 degrees of freedom
Null hypothesis probability = 0.452
Photon flux (15-150 keV) in 1.000 sec: 2.44315 ( -0.21093 0.21141 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11444e-07 ( -1.9604e-08 1.9337e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.156 sec. to 2.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02355 ( -0.645127 0.312767 )
Epeak [keV] : 315.187 ( -315.177 9684.81 )
Norm@50keV : 2.506392E-02 ( -5.805459E-03 2.342555E-02) )
------------------------------------------------------------
Chi-Squared = 57.38482 using 59 PHA bins.
Reduced chi-squared = 1.024729 for 56 degrees of freedom
Null hypothesis probability = 0.424
Photon flux (15-150 keV) in 1.000 sec: 2.42903 ( -0.20417 0.31567 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10011e-07 ( -2.0148e-08 2.0003e-08 ) ergs/cm2
Band function
Time interval is from 1.156 sec. to 2.156 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.936752 ( -9.06325 5.92888 )
beta : -1.19867 ( -8.63681 0.306463 )
Epeak [keV] : 56.9245 ( -222.462 9777.44 )
Norm@50keV : 3.774271E-02 ( -8.259751E-03 1376.01 )
------------------------------------------------------------
Chi-Squared = 57.63647 using 59 PHA bins.
Reduced chi-squared = 1.047936 for 55 degrees of freedom
Null hypothesis probability = 0.378
Photon flux (15-150 keV) in 1.000 sec: 2.42552 ( -0.21146 0.21286 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09883e-07 ( -2.0182e-08 2.0052e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 03:22:33 EST 2008