batgrbproduct Analysis for Trigger=347862
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): Sun Mar 29 04:32:11 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger347862/GCN5_download_cron
======================================================================
Trigger: 00347862 Segment: 000
BAT Trigger Time: 259953913.92 [s; MET]
Trigger Stop: 259953914.944 [s; MET]
UTC: 2009-03-28T17:25:09.307580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 335.989414956508 Dec: -38.6430827502123 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.77
Image Trigger?: NO
Rate S/N Ratio: 12 [ if not an image trigger ]
Image S/N Ratio: 5.77
Flight Position: [ source = BAT ]
RA: 335.989414956508 Dec: -38.6430827502123 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 335.982100391141 Dec: -38.69134743582 [deg; J2000]
{ 22h 23m 55.7s , -38d 41' 28.9" }
+/- 3.8503964751218 [arcmin] (estimated 90% radius based on SNR)
+/- 2.19022746888937 [arcmin] (formal 1-sigma fit error)
SNR: 4.43283964513655
Angular difference between Flight and Ground position is 2.916084 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 1.02400001883507 +/-
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
T50: 1.02400001883507 +/-
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02400001883507 second)
Measured from: -1.49011611938477e-08
to: 1.02400000393391 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.008349 -0.008349 0.017600 0.032747
0.006161 0.006875 0.007098 0.008304 [error]
Peak 0.008349 -0.008349 0.017600 0.032747
0.006161 0.006875 0.007098 0.008304 [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 7.22e-11 8.52e-10 9.37e-09 7.72e-07 4.18e-08 3.70e-07 erg/cm2
Error 1.78e-10 1.08e-09 7.92e-09 3.86e-07 2.04e-08 0.00e+00 erg/cm2
Peak flux Power-law 2.09e-03 1.32e-02 7.23e-02 1.83e+00 2.39e-01 1.93e+00 ph/cm2/s
Error 5.35e-03 1.93e-02 6.23e-02 9.03e-01 1.26e-01 9.02e-01 ph/cm2/s
Fluence Cutoff-PL 5.55e-11 7.35e-10 8.96e-09 8.77e-07 4.20e-08 6.76e-07 erg/cm2
Error 1.55e-10 1.01e-09 5.81e-09 4.54e-07 2.03e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.62e-03 1.12e-02 6.86e-02 2.06e+00 2.36e-01 2.14e+00 ph/cm2/s
Error 4.68e-03 1.78e-02 4.62e-02 1.03e+00 1.24e-01 1.03e+00 ph/cm2/s
Fluence Band 1.29e-11 1.60e-10 3.65e-09 2.53e-06 3.49e-08 1.96e-07 erg/cm2
Error 5.79e-09 2.00e-06 2.37e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.26e-05 1.12e-03 2.70e-02 6.10e+00 1.70e-01 5.90e+00 ph/cm2/s
Error 2.03e-03 1.05e-02 4.45e-02 5.23e+00 1.30e-01 5.18e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -1.405 0.715 - - 8.41e-04 9.30e-04 62.143 57
CPL -2.136 0.964 9999.2 5000.0 4.60e-04 7.60e-04 60.792 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -1.405 0.715 - - 8.41e-04 9.30e-04 62.143 57
CPL -2.136 0.964 9999.2 5000.0 4.60e-04 7.60e-04 60.792 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 -0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
335.9821 -38.6913 0.0435 23.8 -176.1 0.0650 4.4 TRIG_00347862
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-28.419 -9.920 (delta_t = 18.499 [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 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.40500 ( -0.555681 0.874976 )
Norm@50keV : 8.413184E-04 ( -8.413185E-04 1.018737E-03) )
------------------------------------------------------------
Chi-Squared = 62.14260 using 59 PHA bins.
Reduced chi-squared = 1.090221 for 57 degrees of freedom
Null hypothesis probability = 0.298
Photon flux (15-150 keV) in 1.024 sec: 0.238546 ( -0.125248 0.126586 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.18335e-08 ( -2.10856e-08 1.96813e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.13580 ( -0.655209 1.27199 )
Epeak [keV] : 9999.19 ( -9999.18 0.808594 )
Norm@50keV : 4.600892E-04 ( -4.600892E-04 1.060065E-03) )
------------------------------------------------------------
Chi-Squared = 60.79244 using 59 PHA bins.
Reduced chi-squared = 1.085579 for 56 degrees of freedom
Null hypothesis probability = 0.307
Photon flux (15-150 keV) in 1.024 sec: 0.235645 ( -0.12232 0.126041 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.20453e-08 ( -2.10071e-08 1.96823e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.482613 ( -1.525879E-04 14.9998 )
beta : 1.41220 ( -0.923595 0.502544 )
Epeak [keV] : 22.9055 ( -22.8055 9977.09 )
Norm@50keV : 1.417194E-03 ( -7.106800E-02 0.144689 )
------------------------------------------------------------
Chi-Squared = 62.13885 using 59 PHA bins.
Reduced chi-squared = 1.129797 for 55 degrees of freedom
Null hypothesis probability = 0.237
Photon flux (15-150 keV) in 1.024 sec: 0.170130 ( -0.102441 0.157299 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.48971e-08 ( -1.98871e-08 2.75135e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.40500 ( -0.555681 0.874976 )
Norm@50keV : 8.413184E-04 ( -8.413185E-04 1.018737E-03) )
------------------------------------------------------------
Chi-Squared = 62.14260 using 59 PHA bins.
Reduced chi-squared = 1.090221 for 57 degrees of freedom
Null hypothesis probability = 0.298
Photon flux (15-150 keV) in 1.024 sec: 0.238546 ( -0.125248 0.126586 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.18335e-08 ( -2.10856e-08 1.96813e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.13580 ( -0.655209 1.27199 )
Epeak [keV] : 9999.19 ( -9999.18 0.808594 )
Norm@50keV : 4.600892E-04 ( -4.600892E-04 1.060065E-03) )
------------------------------------------------------------
Chi-Squared = 60.79244 using 59 PHA bins.
Reduced chi-squared = 1.085579 for 56 degrees of freedom
Null hypothesis probability = 0.307
Photon flux (15-150 keV) in 1.024 sec: 0.235645 ( -0.12232 0.126041 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.20453e-08 ( -2.10071e-08 1.96823e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.482613 ( -1.525879E-04 14.9998 )
beta : 1.41220 ( -0.923595 0.502544 )
Epeak [keV] : 22.9055 ( -22.8055 9977.09 )
Norm@50keV : 1.417194E-03 ( -7.106800E-02 0.144689 )
------------------------------------------------------------
Chi-Squared = 62.13885 using 59 PHA bins.
Reduced chi-squared = 1.129797 for 55 degrees of freedom
Null hypothesis probability = 0.237
Photon flux (15-150 keV) in 1.024 sec: 0.170130 ( -0.102441 0.157299 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.48971e-08 ( -1.98871e-08 2.75135e-08 ) ergs/cm2
Plot creation:
Sun Mar 29 04:43:38 EDT 2009