batgrbproduct Analysis for Trigger=341504
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 Jan 30 06:51:37 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger341504/GCN5_download_cron
======================================================================
Trigger: 00341504 Segment: 000
BAT Trigger Time: 254956039.744 [s; MET]
Trigger Stop: 254956040 [s; MET]
UTC: 2009-01-29T21:07:15.287600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 269.091866815445 Dec: -32.8258331356111 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.36
Image Trigger?: NO
Rate S/N Ratio: 24.1246761636296 [ if not an image trigger ]
Image S/N Ratio: 11.36
Flight Position: [ source = BAT ]
RA: 269.091866815445 Dec: -32.8258331356111 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 269.104636585056 Dec: -32.7930096607758 [deg; J2000]
{ 17h 56m 25.1s , -32d 47' 34.8" }
+/- 0.696181169739153 [arcmin] (estimated 90% radius based on SNR)
+/- 0.239328670221731 [arcmin] (formal 1-sigma fit error)
SNR: 51.027095429528
Angular difference between Flight and Ground position is 2.072018 arcmin
Partial Coding Fraction: 0.890625 [ including projection effects ]
Duration
T90: 17.5480000078678 +/- 2.70074359774358
Measured from: 0.3960000872612
to: 17.944000095129 [s; relative to TRIGTIME]
T50: 7.01199999451637 +/- 0.441542730559746
Measured from: 2.09600010514259
to: 9.10800009965897 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.00400000810623
to: 2.00400000810623 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.195999979972839
to: 27.0040000081062 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.358417 1.498594 0.847881 0.117091
0.036664 0.034151 0.029653 0.025489 [error]
Peak 0.122158 0.183312 0.124782 0.029096
0.008013 0.008217 0.007332 0.005792 [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 4.18e-07 6.10e-07 6.63e-07 1.35e-06 2.11e-06 3.04e-06 erg/cm2
Error 2.41e-08 1.99e-08 3.09e-08 1.38e-07 7.04e-08 1.59e-07 erg/cm2
Peak flux Power-law 1.21e+00 1.23e+00 8.72e-01 9.86e-01 3.70e+00 4.30e+00 ph/cm2/s
Error 1.17e-01 7.15e-02 6.16e-02 1.44e-01 2.05e-01 2.38e-01 ph/cm2/s
Fluence Cutoff-PL 3.95e-07 6.23e-07 6.68e-07 8.64e-07 2.05e-06 2.51e-06 erg/cm2
Error 3.08e-08 2.30e-08 3.22e-08 3.26e-07 6.51e-08 3.44e-07 erg/cm2
Peak flux Cutoff-PL 1.12e+00 1.27e+00 8.99e-01 6.09e-01 3.62e+00 3.90e+00 ph/cm2/s
Error 1.42e-01 6.30e-02 6.84e-02 2.72e-01 2.17e-01 3.54e-01 ph/cm2/s
Fluence Band 3.91e-07 6.21e-07 6.66e-07 9.82e-07 2.04e-06 2.69e-06 erg/cm2
Error 3.47e-08 2.65e-08 3.81e-08 3.43e-07 8.81e-08 3.98e-07 erg/cm2
Peak flux Band 1.12e+00 1.27e+00 8.97e-01 6.85e-01 3.61e+00 3.97e+00 ph/cm2/s
Error 1.71e-01 1.17e-01 8.29e-02 2.16e-01 4.04e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.880 0.064 - - 8.42e-03 2.81e-04 48.653 57
CPL 1.578 0.265 68.2 54.8 1.19e-02 3.66e-03 44.613 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.493 0.098 - - 2.97e-02 1.65e-03 47.961 57
CPL 1.068 0.406 109.6 240.9 4.86e-02 2.36e-02 44.424 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: 12.608000 sec.
T50 in the 50-300 keV band: 5.056000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 27.200 -0.196 27.004
T90 17.548 0.396 17.944
T50 7.012 2.096 9.108
Peak 1.000 1.004 2.004
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
269.1046 -32.7930 0.0037 18.2 -129.2 3.9266 51.0 TRIG_00341504
------------------------------------------
Foreground time interval of the image:
-0.196 27.004 (delta_t = 27.200 [sec])
Background time interval of the image:
-119.744 -116.182 (delta_t = 3.562 [sec])
-114.744 -0.196 (delta_t = 114.548 [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 -0.196 sec. to 27.004 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87985 ( -6.385219E-02 6.443191E-02) )
Norm@50keV : 8.422011E-03 ( -2.819439E-04 2.807770E-04) )
------------------------------------------------------------
Chi-Squared = 48.65317 using 59 PHA bins.
Reduced chi-squared = 0.8535643 for 57 degrees of freedom
Null hypothesis probability = 0.776
Photon flux (15-150 keV) in 27.20 sec: 1.19844 ( -0.0412 0.04139 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10598e-06 ( -7.02086e-08 7.05078e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.196 sec. to 27.004 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57769 ( -0.273425 0.257333 )
Epeak [keV] : 68.2474 ( -13.1649 96.3748 )
Norm@50keV : 1.193632E-02 ( -2.995774E-03 4.328231E-03) )
------------------------------------------------------------
Chi-Squared = 44.61331 using 59 PHA bins.
Reduced chi-squared = 0.7966663 for 56 degrees of freedom
Null hypothesis probability = 0.863
Photon flux (15-150 keV) in 27.20 sec: 1.16814 ( -0.04781 0.04769 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04614e-06 ( -8.71325e-08 4.31338e-08 ) ergs/cm2
Band function
Time interval is from -0.196 sec. to 27.004 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.57390 ( -0.260675 0.655651 )
beta : -2.31428 ( -7.95180 0.161970 )
Epeak [keV] : 67.8276 ( -25.4337 103.886 )
Norm@50keV : 1.199124E-02 ( -5.508755E-03 5.740498E-02) )
------------------------------------------------------------
Chi-Squared = 44.59912 using 59 PHA bins.
Reduced chi-squared = 0.8108932 for 55 degrees of freedom
Null hypothesis probability = 0.841
Photon flux (15-150 keV) in 27.20 sec: 1.16449 ( -0.05048 0.04931 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04228e-06 ( -8.55576e-08 9.0731e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.004 sec. to 2.004 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49334 ( -9.719098E-02 9.793007E-02) )
Norm@50keV : 2.969739E-02 ( -1.657285E-03 1.652123E-03) )
------------------------------------------------------------
Chi-Squared = 47.96122 using 59 PHA bins.
Reduced chi-squared = 0.8414250 for 57 degrees of freedom
Null hypothesis probability = 0.797
Photon flux (15-150 keV) in 1.000 sec: 3.70081 ( -0.2047 0.20492 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.82013e-07 ( -1.7331e-08 1.7487e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.004 sec. to 2.004 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06772 ( -0.424411 0.387938 )
Epeak [keV] : 109.629 ( -32.1574 449.583 )
Norm@50keV : 4.858321E-02 ( -1.720215E-02 2.990434E-02) )
------------------------------------------------------------
Chi-Squared = 44.42416 using 59 PHA bins.
Reduced chi-squared = 0.7932885 for 56 degrees of freedom
Null hypothesis probability = 0.868
Photon flux (15-150 keV) in 1.000 sec: 3.61876 ( -0.2172 0.21715 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72565e-07 ( -1.9803e-08 1.9385e-08 ) ergs/cm2
Band function
Time interval is from 1.004 sec. to 2.004 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.648226 ( -0.787754 3.20889 )
beta : -1.66930 ( -8.33070 0.188925 )
Epeak [keV] : 63.8900 ( -31.3540 372.334 )
Norm@50keV : 9.081235E-02 ( -4.559695E-02 101.438 )
------------------------------------------------------------
Chi-Squared = 44.18819 using 59 PHA bins.
Reduced chi-squared = 0.8034217 for 55 degrees of freedom
Null hypothesis probability = 0.851
Photon flux (15-150 keV) in 1.000 sec: 3.60667 ( -0.21371 0.21794 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.7426e-07 ( -2.0349e-08 1.8212e-08 ) ergs/cm2
Plot creation:
Fri Jan 30 07:00:03 EST 2009