batgrbproduct Analysis for Trigger=220020
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 21:17:27 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger220020/GCN5_download_cron
======================================================================
Trigger: 00220020 Segment: 000
BAT Trigger Time: 174984638.272 [s; MET]
Trigger Stop: 174984638.784 [s; MET]
UTC: 2006-07-19T06:50:36.945900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 18.4558708767216 Dec: -48.3753985429403 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.95
Image Trigger?: NO
Rate S/N Ratio: 20.976176963403 [ if not an image trigger ]
Image S/N Ratio: 12.95
Flight Position: [ source = BAT ]
RA: 18.4558708767216 Dec: -48.3753985429403 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 18.4202572084756 Dec: -48.3774472773898 [deg; J2000]
{ 01h 13m 40.9s , -48d 22' 38.8" }
+/- 1.2695417522938 [arcmin] (estimated 90% radius based on SNR)
+/- 0.450625024268231 [arcmin] (formal 1-sigma fit error)
SNR: 21.6297377429215
RA = 1h 13m 40.9s (18.420257 deg.)
Dec = -48d 22' 39" (-48.377447 deg.)
Angular difference between Flight and Ground position is 1.424661 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 66.9120000004768 +/- 11.5260985515568
Measured from: 0.46399998664856
to: 67.3759999871254 [s; relative to TRIGTIME]
T50: 43.4560000002384 +/- 10.6454850354049
Measured from: 7.391999989748
to: 50.8479999899864 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.371999979019165
to: 1.37199997901917 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.156000018119812
to: 84.6399999856949 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.043568 1.011703 0.597175 0.063501
0.045855 0.046394 0.040333 0.034182 [error]
Peak 0.070442 0.106057 0.065257 0.002625
0.006808 0.007272 0.006177 0.004525 [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 3.46e-07 4.71e-07 4.75e-07 8.66e-07 1.57e-06 2.16e-06 erg/cm2
Error 3.21e-08 2.60e-08 4.11e-08 1.59e-07 9.33e-08 1.93e-07 erg/cm2
Peak flux Power-law 9.17e-01 7.52e-01 4.18e-01 3.43e-01 2.24e+00 2.43e+00 ph/cm2/s
Error 1.17e-01 6.40e-02 4.99e-02 7.83e-02 1.92e-01 2.04e-01 ph/cm2/s
Fluence Cutoff-PL 3.36e-07 4.79e-07 4.77e-07 6.62e-07 1.55e-06 1.93e-06 erg/cm2
Error 3.84e-08 3.15e-08 4.23e-08 2.40e-07 1.07e-07 3.53e-07 erg/cm2
Peak flux Cutoff-PL 7.76e-01 8.57e-01 4.42e-01 1.04e-01 2.16e+00 2.18e+00 ph/cm2/s
Error 1.39e-01 8.62e-02 6.04e-02 7.02e-02 1.97e-01 2.08e-01 ph/cm2/s
Fluence Band 3.33e-07 4.77e-07 4.76e-07 6.60e-07 1.55e-06 2.14e-06 erg/cm2
Error 3.80e-08 3.14e-08 4.24e-08 3.21e-07 1.07e-07 0.00e+00 erg/cm2
Peak flux Band 7.76e-01 8.56e-01 4.42e-01 1.04e-01 2.16e+00 2.18e+00 ph/cm2/s
Error 1.38e-01 7.52e-02 5.27e-02 6.64e-02 1.97e-01 2.08e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.990 0.110 - - 2.01e-03 1.24e-04 67.779 57
CPL 1.757 0.000 49.9 4995.4 2.65e-03 1.27e-03 67.324 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.847 0.142 - - 1.60e-02 1.49e-03 55.306 57
CPL 0.624 0.720 51.6 10.0 7.32e-02 7.91e-02 44.247 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: 52.544000 sec.
T50 in the 50-300 keV band: 41.024000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 84.796 -0.156 84.640
T90 66.912 0.464 67.376
T50 43.456 7.392 50.848
Peak 1.000 0.372 1.372
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
18.4203 -48.3774 0.0089 35.0 -20.2 0.7808 21.6 TRIG_00220020
------------------------------------------
Foreground time interval of the image:
-0.156 9.429 (delta_t = 9.585 [sec])
Background time interval of the image:
-239.272 -0.156 (delta_t = 239.116 [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 -0.156 sec. to 84.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99027 ( -0.109083 0.111383 )
Norm@50keV : 2.008850E-03 ( -1.248471E-04 1.234638E-04) )
------------------------------------------------------------
Chi-Squared = 67.77945 using 59 PHA bins.
Reduced chi-squared = 1.189113 for 57 degrees of freedom
Null hypothesis probability = 0.155
Photon flux (15-150 keV) in 84.80 sec: 0.299988 ( -0.017486 0.017587 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57037e-06 ( -9.3263e-08 9.34157e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.156 sec. to 84.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75652 ( )
Epeak [keV] : 49.8811 ( -40.6612 9950.12 )
Norm@50keV : 2.648887E-03 ( -9.204200E-04 1.620944E-03) )
------------------------------------------------------------
Chi-Squared = 67.32440 using 59 PHA bins.
Reduced chi-squared = 1.202222 for 56 degrees of freedom
Null hypothesis probability = 0.143
Photon flux (15-150 keV) in 84.80 sec: 0.296609 ( -0.019088 0.018652 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54832e-06 ( -1.07247e-07 1.0656e-07 ) ergs/cm2
Band function
Time interval is from -0.156 sec. to 84.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.81878 ( -8.18122 0.442389 )
beta : -8.87934 ( -1.12066 6.98710 )
Epeak [keV] : 50.1119 ( -50.0119 9949.89 )
Norm@50keV : 2.467946E-03 ( -5.579146E-04 1.681650E-03) )
------------------------------------------------------------
Chi-Squared = 67.26266 using 59 PHA bins.
Reduced chi-squared = 1.222957 for 55 degrees of freedom
Null hypothesis probability = 0.124
Photon flux (15-150 keV) in 84.80 sec: 0.296605 ( -0.01911 0.01909 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5463e-06 ( -1.0728e-07 1.0628e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.372 sec. to 1.372 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84655 ( -0.139983 0.144341 )
Norm@50keV : 1.595712E-02 ( -1.497902E-03 1.481414E-03) )
------------------------------------------------------------
Chi-Squared = 55.30582 using 59 PHA bins.
Reduced chi-squared = 0.9702776 for 57 degrees of freedom
Null hypothesis probability = 0.539
Photon flux (15-150 keV) in 1.000 sec: 2.23980 ( -0.19178 0.192 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.46756e-07 ( -1.3791e-08 1.3858e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.372 sec. to 1.372 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.623742 ( -0.775551 0.663872 )
Epeak [keV] : 51.6015 ( -7.40137 12.5069 )
Norm@50keV : 7.320183E-02 ( -4.067526E-02 0.117580 )
------------------------------------------------------------
Chi-Squared = 44.24734 using 59 PHA bins.
Reduced chi-squared = 0.7901310 for 56 degrees of freedom
Null hypothesis probability = 0.872
Photon flux (15-150 keV) in 1.000 sec: 2.15650 ( -0.19712 0.19751 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36428e-07 ( -1.4538e-08 1.4846e-08 ) ergs/cm2
Band function
Time interval is from 0.372 sec. to 1.372 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.627505 ( -0.659960 0.360674 )
beta : -7.68158 ( -2.31842 17.6815 )
Epeak [keV] : 51.6200 ( -7.43227 13.2404 )
Norm@50keV : 7.285484E-02 ( -1.713476E-02 1.217468E-02) )
------------------------------------------------------------
Chi-Squared = 44.24751 using 59 PHA bins.
Reduced chi-squared = 0.8045002 for 55 degrees of freedom
Null hypothesis probability = 0.850
Photon flux (15-150 keV) in 1.000 sec: 2.15662 ( -0.19726 0.19739 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36133e-07 ( -1.3248e-08 1.4991e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 21:34:17 EST 2008