batgrbproduct Analysis for Trigger=348929
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 v2.44
Process Start Time (local time): Fri Apr 10 21:02:28 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger348929/GCN5_download_cron
======================================================================
Trigger: 00348929 Segment: 000
BAT Trigger Time: 261075477.504 [s; MET]
Trigger Stop: 261075478.528 [s; MET]
UTC: 2009-04-10T16:57:52.856200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 334.979821390126 Dec: 15.4711522547987 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.82
Image Trigger?: NO
Rate S/N Ratio: 12.2065556157337 [ if not an image trigger ]
Image S/N Ratio: 7.82
Flight Position: [ source = BAT ]
RA: 334.979821390126 Dec: 15.4711522547987 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 334.956002005402 Dec: 15.4190686293622 [deg; J2000]
{ 22h 19m 49.4s , +15d 25' 08.6" }
+/- 1.75450630161149 [arcmin] (estimated 90% radius based on SNR)
+/- 0.618297597483648 [arcmin] (formal 1-sigma fit error)
SNR: 13.6246583073405
Angular difference between Flight and Ground position is 3.415169 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 165.376000016928 +/- 7.23553230973082
Measured from: -35.7959999144077
to: 129.58000010252 [s; relative to TRIGTIME]
T50: 99.1319999992847 +/- 2.20805796355031
Measured from: 7.73200008273125
to: 106.864000082016 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.90399998426437
to: 9.90399998426437 [s; relative to TRIGTIME]
Total Fluence
Measured from: -49.2240000069141
to: 139.444000005722 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.902775 2.914567 2.827523 0.689558
0.069828 0.070921 0.064217 0.054201 [error]
Peak 0.037737 0.074319 0.111854 0.047262
0.005469 0.006148 0.006485 0.005122 [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 5.24e-07 1.17e-06 2.05e-06 8.43e-06 5.61e-06 1.22e-05 erg/cm2
Error 3.08e-08 3.97e-08 6.37e-08 6.25e-07 1.63e-07 6.51e-07 erg/cm2
Peak flux Power-law 3.08e-01 5.15e-01 6.54e-01 1.66e+00 1.94e+00 3.14e+00 ph/cm2/s
Error 5.11e-02 5.21e-02 4.74e-02 2.69e-01 1.41e-01 2.79e-01 ph/cm2/s
Fluence Cutoff-PL 4.92e-07 1.18e-06 2.10e-06 6.26e-06 5.54e-06 9.70e-06 erg/cm2
Error 4.11e-08 4.20e-08 7.61e-08 1.62e-06 1.77e-07 1.65e-06 erg/cm2
Peak flux Cutoff-PL 2.53e-01 5.17e-01 7.03e-01 1.02e+00 1.90e+00 2.49e+00 ph/cm2/s
Error 7.05e-02 5.62e-02 6.75e-02 4.92e-01 1.46e-01 5.14e-01 ph/cm2/s
Fluence Band 5.19e-07 1.18e-06 2.10e-06 6.22e-06 5.53e-06 1.21e-05 erg/cm2
Error 4.18e-08 7.61e-08 1.98e-06 1.77e-07 6.48e-07 0.00e+00 erg/cm2
Peak flux Band 2.53e-01 5.17e-01 7.02e-01 1.02e+00 1.90e+00 2.49e+00 ph/cm2/s
Error 7.06e-02 5.62e-02 6.76e-02 4.98e-01 1.46e-01 5.19e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.187 0.051 - - 2.92e-03 8.01e-05 54.324 57
CPL 0.922 0.214 236.1 592.8 3.80e-03 7.74e-04 50.582 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.655 0.129 - - 1.67e-02 1.28e-03 70.248 57
CPL 0.080 0.485 212.5 1652.3 2.82e-02 1.66e-02 67.265 0
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: 160.896000 sec.
T50 in the 50-300 keV band: 88.256000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 188.668 -49.224 139.444
T90 165.376 -35.796 129.580
T50 99.132 7.732 106.864
Peak 1.000 8.904 9.904
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
334.9560 +15.4191 0.0141 4.4 -57.1 8.6646 13.6 TRIG_00348929
------------------------------------------
Foreground time interval of the image:
-49.224 139.444 (delta_t = 188.668 [sec])
Background time interval of the image:
-56.203 -49.224 (delta_t = 6.979 [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 -49.224 sec. to 139.444 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18651 ( -5.158269E-02 5.136049E-02) )
Norm@50keV : 2.917470E-03 ( -8.013006E-05 8.004438E-05) )
------------------------------------------------------------
Chi-Squared = 54.32409 using 59 PHA bins.
Reduced chi-squared = 0.9530541 for 57 degrees of freedom
Null hypothesis probability = 0.576
Photon flux (15-150 keV) in 188.7 sec: 0.341816 ( -0.010021 0.010042 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.60669e-06 ( -1.62584e-07 1.63207e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -49.224 sec. to 139.444 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.921801 ( -0.194106 0.234280 )
Epeak [keV] : 236.144 ( -74.7212 1110.78 )
Norm@50keV : 3.799340E-03 ( -7.626195E-04 7.849238E-04) )
------------------------------------------------------------
Chi-Squared = 50.58199 using 59 PHA bins.
Reduced chi-squared = 0.9032497 for 56 degrees of freedom
Null hypothesis probability = 0.679
Photon flux (15-150 keV) in 188.7 sec: 0.336448 ( -0.010902 0.010996 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.53544e-06 ( -1.78944e-07 1.7451e-07 ) ergs/cm2
Band function
Time interval is from -49.224 sec. to 139.444 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.882236 ( -0.262912 0.468359 )
beta : -1.40322 ( -8.59678 0.207109 )
Epeak [keV] : 205.687 ( -101.321 4369.71 )
Norm@50keV : 3.982041E-03 ( -7.832488E-04 4.242255E-03) )
------------------------------------------------------------
Chi-Squared = 50.41602 using 59 PHA bins.
Reduced chi-squared = 0.9166549 for 55 degrees of freedom
Null hypothesis probability = 0.650
Photon flux (15-150 keV) in 188.7 sec: 0.335872 ( -0.011074 0.011223 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.52953e-06 ( -1.76869e-07 1.76416e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 8.904 sec. to 9.904 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.654628 ( -0.130723 0.126765 )
Norm@50keV : 1.669321E-02 ( -1.286882E-03 1.273680E-03) )
------------------------------------------------------------
Chi-Squared = 70.24815 using 59 PHA bins.
Reduced chi-squared = 1.232424 for 57 degrees of freedom
Null hypothesis probability = 0.112
Photon flux (15-150 keV) in 1.000 sec: 1.93735 ( -0.14068 0.14087 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08115e-07 ( -1.5987e-08 1.5882e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.904 sec. to 9.904 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 8.030684E-02 ( -0.682432 0.287414 )
Epeak [keV] : 212.464 ( -80.7653 3223.88 )
Norm@50keV : 2.821622E-02 ( -1.069950E-02 2.254901E-02) )
------------------------------------------------------------
Chi-Squared = 67.26466 using 59 PHA bins.
but latest trial 0.635299 gives Chi-Squared = 2.90665
Reduced chi-squared = 1.201155 for 56 degrees of freedom
Null hypothesis probability = 0.144
Photon flux (15-150 keV) in 1.000 sec: 1.90006 ( -0.14623 0.14573 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04939e-07 ( -1.6587e-08 1.6614e-08 ) ergs/cm2
Band function
Time interval is from 8.904 sec. to 9.904 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.779689 ( -9.22031 5.77969 )
beta : -0.654644 ( -0.126720 0.130798 )
Epeak [keV] : 19.1827 ( -19.0827 9980.82 )
Norm@50keV : 2.281742E-02 ( -7.340923E-03 3314.00 )
------------------------------------------------------------
Chi-Squared = 70.24816 using 59 PHA bins.
Reduced chi-squared = 1.277239 for 55 degrees of freedom
Null hypothesis probability = 8.075E-02
Photon flux (15-150 keV) in 1.000 sec: 1.90022 ( -0.14635 0.14564 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04895e-07 ( -1.6637e-08 1.6535e-08 ) ergs/cm2
Plot creation:
Fri Apr 10 21:22:38 EDT 2009