batgrbproduct Analysis for Trigger=342121
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 v2.42
Process Start Time (local time): Fri Feb 6 05:02:12 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger342121/GCN5_download_cron
======================================================================
Trigger: 00342121 Segment: 000
BAT Trigger Time: 255567799.296 [s; MET]
Trigger Stop: 255567803.392 [s; MET]
UTC: 2009-02-05T23:03:14.820740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 220.925433877431 Dec: -27.8637399346592 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.16
Image Trigger?: NO
Rate S/N Ratio: 15.1327459504216 [ if not an image trigger ]
Image S/N Ratio: 8.16
Flight Position: [ source = BAT ]
RA: 220.925433877431 Dec: -27.8637399346592 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 220.915295813609 Dec: -27.8470907047029 [deg; J2000]
{ 14h 43m 39.7s , -27d 50' 49.5" }
+/- 2.00757006801937 [arcmin] (estimated 90% radius based on SNR)
+/- 0.87481098933619 [arcmin] (formal 1-sigma fit error)
SNR: 11.239102932114
Angular difference between Flight and Ground position is 1.134522 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 8.81599998474121 +/- 1.7940791274129
Measured from: -2.62799990177155
to: 6.18800008296967 [s; relative to TRIGTIME]
T50: 4.19999998807907 +/- 1.13575349668149
Measured from: 0.060000091791153
to: 4.26000007987022 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.09200000762939
to: 5.09200000762939 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.92800000309944
to: 6.64399999380112 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.161069 0.166144 0.059276 -0.013022
0.017064 0.016050 0.013783 0.011673 [error]
Peak 0.028421 0.024684 0.008427 0.000115
0.005563 0.005277 0.004453 0.003684 [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 4.82e-08 5.99e-08 5.40e-08 8.42e-08 1.91e-07 2.45e-07 erg/cm2
Error 7.52e-09 7.26e-09 1.21e-08 3.63e-08 2.77e-08 5.11e-08 erg/cm2
Peak flux Power-law 2.24e-01 1.63e-01 7.91e-02 5.43e-02 4.92e-01 5.21e-01 ph/cm2/s
Error 7.36e-02 4.04e-02 3.34e-02 4.38e-02 1.20e-01 1.29e-01 ph/cm2/s
Fluence Cutoff-PL 4.42e-08 6.91e-08 4.64e-08 1.10e-08 1.69e-07 1.71e-07 erg/cm2
Error 8.67e-09 1.05e-08 1.57e-08 2.62e-08 2.92e-08 3.95e-08 erg/cm2
Peak flux Cutoff-PL 2.15e-01 1.96e-01 4.93e-02 2.22e-03 4.62e-01 4.64e-01 ph/cm2/s
Error 6.17e-02 6.43e-02 5.01e-02 4.82e-02 1.25e-01 1.39e-01 ph/cm2/s
Fluence Band 4.37e-08 6.87e-08 4.62e-08 2.41e-08 1.72e-07 1.84e-07 erg/cm2
Error 8.38e-09 1.01e-08 1.36e-08 3.91e-08 2.39e-08 5.17e-08 erg/cm2
Peak flux Band 2.14e-01 1.90e-01 6.57e-02 2.60e-02 4.85e-01 4.98e-01 ph/cm2/s
Error 8.20e-02 4.14e-02 2.64e-02 4.58e-02 1.20e-01 1.29e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.150 0.230 - - 2.14e-03 3.48e-04 69.601 57
CPL 0.794 1.293 34.3 15.5 1.40e-02 5.63e-02 64.926 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.046 0.462 - - 3.21e-03 1.04e-03 64.827 57
CPL 0.543 0.000 33.0 5000.0 3.01e-02 0.00e+00 63.986 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 9.572 -2.928 6.644
T90 8.816 -2.628 6.188
T50 4.200 0.060 4.260
Peak 1.000 4.092 5.092
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
220.9153 -27.8471 0.0171 10.6 -28.1 0.3404 11.2 TRIG_00342121
------------------------------------------
Foreground time interval of the image:
-2.928 6.644 (delta_t = 9.572 [sec])
Background time interval of the image:
-239.296 -2.928 (delta_t = 236.368 [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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -2.928 sec. to 6.644 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.15045 ( -0.221462 0.238343 )
Norm@50keV : 2.137356E-03 ( -3.513414E-04 3.447833E-04) )
------------------------------------------------------------
Chi-Squared = 69.60079 using 59 PHA bins.
Reduced chi-squared = 1.221066 for 57 degrees of freedom
Null hypothesis probability = 0.122
Photon flux (15-150 keV) in 9.572 sec: 0.344882 ( -0.040233 0.040235 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.91079e-07 ( -2.72352e-08 2.8223e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.928 sec. to 6.644 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.794306 ( -1.48363 1.10205 )
Epeak [keV] : 34.3399 ( -21.4858 9.52091 )
Norm@50keV : 1.400286E-02 ( -1.400286E-02 9.862953E-02) )
------------------------------------------------------------
Chi-Squared = 64.92557 using 59 PHA bins.
Reduced chi-squared = 1.159385 for 56 degrees of freedom
Null hypothesis probability = 0.194
Photon flux (15-150 keV) in 9.572 sec: 0.329295 ( -0.041601 0.041784 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6855e-07 ( -2.69911e-08 3.14019e-08 ) ergs/cm2
Band function
Time interval is from -2.928 sec. to 6.644 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.11053 ( -0.665697 0.870343 )
beta : -9.06004 ( -0.939957 6.80698 )
Epeak [keV] : 33.2657 ( -22.8783 11.0785 )
Norm@50keV : 9.060501E-03 ( -9.060501E-03 0.148341 )
------------------------------------------------------------
Chi-Squared = 65.11297 using 59 PHA bins.
Reduced chi-squared = 1.183872 for 55 degrees of freedom
Null hypothesis probability = 0.165
Photon flux (15-150 keV) in 9.572 sec: 0.325396 ( -0.040394 0.038314 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71884e-07 ( -1.77963e-08 2.99355e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 4.092 sec. to 5.092 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04637 ( -0.437029 0.486269 )
Norm@50keV : 3.210085E-03 ( -1.053138E-03 1.024948E-03) )
------------------------------------------------------------
Chi-Squared = 64.82702 using 59 PHA bins.
Reduced chi-squared = 1.137316 for 57 degrees of freedom
Null hypothesis probability = 0.222
Photon flux (15-150 keV) in 1.000 sec: 0.492112 ( -0.12009 0.12009 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.97032e-08 ( -8.7059e-09 9.2676e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.092 sec. to 5.092 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.543225 ( )
Epeak [keV] : 32.9882 ( -32.5298 9967.46 )
Norm@50keV : 3.005782E-02 ( )
------------------------------------------------------------
Chi-Squared = 63.98639 using 59 PHA bins.
Reduced chi-squared = 1.142614 for 56 degrees of freedom
Null hypothesis probability = 0.217
Photon flux (15-150 keV) in 1.000 sec: 0.462161 ( -0.118163 0.132729 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29473e-08 ( -7.4044e-09 1.47278e-08 ) ergs/cm2
Band function
Time interval is from 4.092 sec. to 5.092 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.852500 ( -9.14750 5.46541 )
beta : -8.52600 ( )
Epeak [keV] : 33.6078 ( )
Norm@50keV : 1.895214E-02 ( )
------------------------------------------------------------
Chi-Squared = 64.01081 using 59 PHA bins.
Reduced chi-squared = 1.163833 for 55 degrees of freedom
Null hypothesis probability = 0.190
Photon flux (15-150 keV) in 1.000 sec: 0.484944 ( -0.119348 0.120264 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.83884e-08 ( -9.3409e-09 9.1562e-09 ) ergs/cm2
Plot creation:
Fri Feb 6 05:27:46 EST 2009