batgrbproduct Analysis for Trigger=341749
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): Mon Feb 2 04:12:22 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger341749/GCN5_download_cron
======================================================================
Trigger: 00341749 Segment: 000
BAT Trigger Time: 255203227.2 [s; MET]
Trigger Stop: 255203228.224 [s; MET]
UTC: 2009-02-01T17:47:02.735980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 92.0311957018397 Dec: -46.5864119988985 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.91
Image Trigger?: NO
Rate S/N Ratio: 32.7719392163479 [ if not an image trigger ]
Image S/N Ratio: 7.91
Flight Position: [ source = BAT ]
RA: 92.0311957018397 Dec: -46.5864119988985 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 92.0513695035149 Dec: -46.6047338149232 [deg; J2000]
{ 06h 08m 12.3s , -46d 36' 17.0" }
+/- 1.04259423453065 [arcmin] (estimated 90% radius based on SNR)
+/- 0.489396048831362 [arcmin] (formal 1-sigma fit error)
SNR: 28.6575694038911
Angular difference between Flight and Ground position is 1.378502 arcmin
Partial Coding Fraction: 0.0859375 [ including projection effects ]
Duration
T90: 84.5759999752045 +/- 3.96170467326467
Measured from: -1.13599988818169
to: 83.4400000870228 [s; relative to TRIGTIME]
T50: 40.3839999735355 +/- 1.99692562460281
Measured from: 10.7840000987053
to: 51.1680000722408 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.60400000214577
to: 8.60400000214577 [s; relative to TRIGTIME]
Total Fluence
Measured from: -20.2079999744892
to: 102.640000015497 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 9.731513 16.273621 14.187722 3.737306
0.255509 0.279975 0.266871 0.225566 [error]
Peak 0.265624 0.568310 0.722122 0.255418
0.029124 0.039117 0.043670 0.034283 [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 4.16e-06 7.68e-06 1.09e-05 3.27e-05 3.12e-05 5.56e-05 erg/cm2
Error 1.88e-07 2.05e-07 2.84e-07 1.92e-06 7.16e-07 2.07e-06 erg/cm2
Peak flux Power-law 3.38e+00 4.50e+00 4.39e+00 7.68e+00 1.48e+01 1.99e+01 ph/cm2/s
Error 4.45e-01 3.70e-01 3.30e-01 1.19e+00 1.03e+00 1.49e+00 ph/cm2/s
Fluence Cutoff-PL 3.57e-06 7.91e-06 1.15e-05 1.73e-05 3.03e-05 3.73e-05 erg/cm2
Error 2.46e-07 2.24e-07 3.46e-07 3.15e-06 7.73e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.91e+00 4.66e+00 4.76e+00 4.62e+00 1.46e+01 1.70e+01 ph/cm2/s
Error 5.53e-01 4.12e-01 4.35e-01 1.82e+00 1.04e+00 2.06e+00 ph/cm2/s
Fluence Band 3.54e-06 7.88e-06 1.15e-05 1.72e-05 3.03e-05 3.73e-05 erg/cm2
Error 2.43e-07 2.24e-07 3.45e-07 3.15e-06 7.72e-07 0.00e+00 erg/cm2
Peak flux Band 2.91e+00 4.66e+00 4.76e+00 4.62e+00 1.46e+01 1.70e+01 ph/cm2/s
Error 5.53e-01 4.12e-01 4.35e-01 1.82e+00 1.05e+00 2.06e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.493 0.040 - - 2.67e-02 5.99e-04 68.145 57
CPL 0.913 0.185 106.8 18.0 4.83e-02 8.95e-03 35.918 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.034 0.111 - - 1.28e-01 8.81e-03 40.862 57
CPL 0.450 0.473 155.1 163.3 2.33e-01 1.16e-01 35.741 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: 80.448000 sec.
T50 in the 50-300 keV band: 37.760000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 122.848 -20.208 102.640
T90 84.576 -1.136 83.440
T50 40.384 10.784 51.168
Peak 1.000 7.604 8.604
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
92.0514 -46.6047 0.0067 46.5 -50.3 48.7361 28.7 TRIG_00341749
------------------------------------------
Foreground time interval of the image:
-20.208 102.640 (delta_t = 122.848 [sec])
Background time interval of the image:
-239.200 -20.208 (delta_t = 218.992 [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 -20.208 sec. to 102.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49284 ( -4.029441E-02 4.029322E-02) )
Norm@50keV : 2.672003E-02 ( -5.987883E-04 5.987342E-04) )
------------------------------------------------------------
Chi-Squared = 68.14451 using 59 PHA bins.
Reduced chi-squared = 1.195518 for 57 degrees of freedom
Null hypothesis probability = 0.148
Photon flux (15-150 keV) in 122.8 sec: 3.32933 ( -0.08464 0.08491 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.11634e-05 ( -7.15064e-07 7.16292e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -20.208 sec. to 102.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.912501 ( -0.188282 0.180902 )
Epeak [keV] : 106.765 ( -13.0489 22.8586 )
Norm@50keV : 4.828456E-02 ( -7.957488E-03 9.935666E-03) )
------------------------------------------------------------
Chi-Squared = 35.91811 using 59 PHA bins.
Reduced chi-squared = 0.6413947 for 56 degrees of freedom
Null hypothesis probability = 0.983
Photon flux (15-150 keV) in 122.8 sec: 3.19391 ( -0.09191 0.0926 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.02995e-05 ( -7.81499e-07 7.64553e-07 ) ergs/cm2
Band function
Time interval is from -20.208 sec. to 102.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.763278 ( -0.275384 0.528719 )
beta : -1.88095 ( -8.11905 0.200401 )
Epeak [keV] : 90.8943 ( -27.2785 29.1472 )
Norm@50keV : 5.796127E-02 ( -1.522810E-02 5.933300E-02) )
------------------------------------------------------------
Chi-Squared = 34.38297 using 59 PHA bins.
Reduced chi-squared = 0.6251448 for 55 degrees of freedom
Null hypothesis probability = 0.987
Photon flux (15-150 keV) in 122.8 sec: 3.17363 ( -0.09778 0.09688 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.02661e-05 ( -7.70079e-07 7.73886e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 7.600 sec. to 8.608 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03432 ( -0.111696 0.110830 )
Norm@50keV : 0.128220 ( -8.811176E-03 8.805051E-03) )
------------------------------------------------------------
Chi-Squared = 40.86246 using 59 PHA bins.
Reduced chi-squared = 0.7168852 for 57 degrees of freedom
Null hypothesis probability = 0.947
Photon flux (15-150 keV) in 1.008 sec: 14.7920 ( -1.0331 1.0346 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38098e-06 ( -1.0327e-07 1.03608e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.600 sec. to 8.608 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.450022 ( -0.499224 0.447214 )
Epeak [keV] : 155.081 ( -46.1614 280.375 )
Norm@50keV : 0.233270 ( -8.399475E-02 0.147018 )
------------------------------------------------------------
Chi-Squared = 35.74086 using 59 PHA bins.
Reduced chi-squared = 0.6382295 for 56 degrees of freedom
Null hypothesis probability = 0.984
Photon flux (15-150 keV) in 1.008 sec: 14.5968 ( -1.0447 1.0453 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36443e-06 ( -1.07204e-07 1.06552e-07 ) ergs/cm2
Band function
Time interval is from 7.600 sec. to 8.608 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.449782 ( -0.447575 0.499082 )
beta : -7.95548 ( -2.04452 7.75141 )
Epeak [keV] : 155.000 ( -46.1053 279.746 )
Norm@50keV : 0.233342 ( -8.407731E-02 0.147008 )
------------------------------------------------------------
Chi-Squared = 35.74088 using 59 PHA bins.
Reduced chi-squared = 0.6498342 for 55 degrees of freedom
Null hypothesis probability = 0.979
Photon flux (15-150 keV) in 1.008 sec: 14.5975 ( -1.0455 1.0447 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36366e-06 ( -1.07128e-07 1.06484e-07 ) ergs/cm2
Plot creation:
Mon Feb 2 04:36:30 EST 2009