batgrbproduct Analysis for Trigger=155242
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 9 10:58:53 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger155242/GCN5_download_cron
======================================================================
Trigger: 00155242 Segment: 000
BAT Trigger Time: 148476162.048 [s; MET]
Trigger Stop: 148476163.072 [s; MET]
UTC: 2005-09-15T11:22:42.317800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 81.7136478998272 Dec: -28.0303786003 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.68
Image Trigger?: NO
Rate S/N Ratio: 10.5356537528527 [ if not an image trigger ]
Image S/N Ratio: 7.68
Flight Position: [ source = BAT ]
RA: 81.7136478998272 Dec: -28.0303786003 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 81.6902686793553 Dec: -28.0113745309774 [deg; J2000]
{ 05h 26m 45.7s , -28d 00' 40.9" }
+/- 1.42569293410932 [arcmin] (estimated 90% radius based on SNR)
+/- 0.441079373180435 [arcmin] (formal 1-sigma fit error)
SNR: 18.326572156378
RA = 5h 26m 45.7s (81.690269 deg.)
Dec = -28d 0' 41" (-28.011375 deg.)
Angular difference between Flight and Ground position is 1.683326 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 53.1039999723434 +/- 11.6650863801789
Measured from: -6.58400002121925
to: 46.5199999511242 [s; relative to TRIGTIME]
T50: 16.7359999716282 +/- 5.25624352736684
Measured from: 0.61599999666214
to: 17.3519999682903 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 13.6920000016689
to: 14.6920000016689 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.32800000905991
to: 57.8319999873638 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.293932 0.491703 0.360834 0.103959
0.040562 0.041338 0.036260 0.030629 [error]
Peak 0.021924 0.031718 0.033957 0.020645
0.005568 0.005844 0.005362 0.004268 [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 1.02e-07 2.00e-07 3.03e-07 1.00e-06 8.52e-07 1.60e-06 erg/cm2
Error 1.77e-08 2.08e-08 3.58e-08 2.61e-07 8.83e-08 2.84e-07 erg/cm2
Peak flux Power-law 1.60e-01 2.27e-01 2.39e-01 4.64e-01 7.72e-01 1.09e+00 ph/cm2/s
Error 6.45e-02 5.54e-02 4.12e-02 1.85e-01 1.41e-01 1.97e-01 ph/cm2/s
Fluence Cutoff-PL 9.68e-08 2.07e-07 3.12e-07 6.26e-07 8.35e-07 1.24e-06 erg/cm2
Error 2.09e-08 2.52e-08 4.01e-08 4.86e-07 9.63e-08 4.96e-07 erg/cm2
Peak flux Cutoff-PL 1.60e-01 2.27e-01 2.39e-01 4.61e-01 7.72e-01 1.09e+00 ph/cm2/s
Error 6.45e-02 5.54e-02 4.12e-02 1.84e-01 1.41e-01 1.97e-01 ph/cm2/s
Fluence Band 9.18e-08 2.14e-07 3.02e-07 8.34e-07 8.33e-07 1.45e-06 erg/cm2
Error 2.39e-08 2.92e-08 3.90e-08 3.99e-07 7.06e-08 3.82e-07 erg/cm2
Peak flux Band 1.41e-01 2.42e-01 2.42e-01 4.36e-01 7.68e-01 1.07e+00 ph/cm2/s
Error 5.04e-02 4.74e-02 4.07e-02 1.31e-01 1.35e-01 2.17e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.398 0.167 - - 1.33e-03 1.26e-04 64.933 57
CPL 0.964 0.612 122.6 4961.9 2.17e-03 1.63e-03 64.304 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.927 0.324 - - 6.72e-03 1.22e-03 45.234 57
CPL 0.857 0.596 895.7 0.0 7.27e-03 1.22e-03 45.398 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: 21.696000 sec.
T50 in the 50-300 keV band: 8.768000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 66.160 -8.328 57.832
T90 53.104 -6.584 46.520
T50 16.736 0.616 17.352
Peak 1.000 13.692 14.692
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
81.6903 -28.0114 0.0105 30.1 -148.1 0.9334 18.3 TRIG_00155242
------------------------------------------
Foreground time interval of the image:
-8.328 16.553 (delta_t = 24.881 [sec])
Background time interval of the image:
-291.847 -8.328 (delta_t = 283.519 [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 -8.328 sec. to 57.832 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39815 ( -0.167252 0.166455 )
Norm@50keV : 1.331806E-03 ( -1.262127E-04 1.259681E-04) )
------------------------------------------------------------
Chi-Squared = 64.93342 using 59 PHA bins.
Reduced chi-squared = 1.139183 for 57 degrees of freedom
Null hypothesis probability = 0.220
Photon flux (15-150 keV) in 66.16 sec: 0.162123 ( -0.015921 0.015959 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.51704e-07 ( -8.80126e-08 8.85816e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.328 sec. to 57.832 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.963879 ( -0.646711 0.577757 )
Epeak [keV] : 122.620 ( -46.4570 9877.38 )
Norm@50keV : 2.172997E-03 ( -9.478887E-04 2.307550E-03) )
------------------------------------------------------------
Chi-Squared = 64.30447 using 59 PHA bins.
Reduced chi-squared = 1.148294 for 56 degrees of freedom
Null hypothesis probability = 0.209
Photon flux (15-150 keV) in 66.16 sec: 0.160087 ( -0.016444 0.016425 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.3486e-07 ( -9.7103e-08 9.5535e-08 ) ergs/cm2
Band function
Time interval is from -8.328 sec. to 57.832 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.789838 ( -9.21016 4.23075 )
beta : -1.55979 ( -8.44021 0.277897 )
Epeak [keV] : 83.7292 ( -83.6292 9875.46 )
Norm@50keV : 2.926365E-03 ( -1.857818E-02 18.1334 )
------------------------------------------------------------
Chi-Squared = 63.56662 using 59 PHA bins.
Reduced chi-squared = 1.155757 for 55 degrees of freedom
Null hypothesis probability = 0.200
Photon flux (15-150 keV) in 66.16 sec: 0.159142 ( -0.016905 0.016177 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.32736e-07 ( -9.48073e-08 4.62988e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 13.688 sec. to 14.696 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.927439 ( -0.340207 0.307148 )
Norm@50keV : 6.724850E-03 ( -1.238702E-03 1.195013E-03) )
------------------------------------------------------------
Chi-Squared = 45.23358 using 59 PHA bins.
Reduced chi-squared = 0.7935715 for 57 degrees of freedom
Null hypothesis probability = 0.870
Photon flux (15-150 keV) in 1.008 sec: 0.772179 ( -0.140569 0.141366 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.52717e-08 ( -1.30982e-08 1.31735e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.688 sec. to 14.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.856769 ( -0.809744 0.382152 )
Epeak [keV] : 895.707 ( )
Norm@50keV : 7.272316E-03 ( -1.236893E-03 1.204476E-03) )
------------------------------------------------------------
Chi-Squared = 45.39805 using 59 PHA bins.
Reduced chi-squared = 0.8106795 for 56 degrees of freedom
Null hypothesis probability = 0.844
Photon flux (15-150 keV) in 1.008 sec: 0.771987 ( -0.140522 0.141342 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.5314e-08 ( -1.31359e-08 1.31667e-08 ) ergs/cm2
Band function
Time interval is from 13.688 sec. to 14.696 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.605564 ( -9.39444 5.60556 )
beta : -0.945539 ( -9.05446 0.346882 )
Epeak [keV] : 125.563 ( -125.463 9874.44 )
Norm@50keV : 1.123177E-02 ( -28.0010 74.7228 )
------------------------------------------------------------
Chi-Squared = 45.07101 using 59 PHA bins.
Reduced chi-squared = 0.8194730 for 55 degrees of freedom
Null hypothesis probability = 0.828
Photon flux (15-150 keV) in 1.008 sec: 0.767580 ( -0.133995 0.135635 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.59531e-08 ( -1.26076e-08 1.26235e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 11:13:48 EST 2008