batgrbproduct Analysis for Trigger=353540
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): Sat May 30 00:22:12 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger353540/GCN5_download_cron
======================================================================
Trigger: 00353540 Segment: 000
BAT Trigger Time: 265299160 [s; MET]
Trigger Stop: 265299224 [s; MET]
UTC: 2009-05-29T14:12:35.217820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 212.473951892778 Dec: 24.4370020416008 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.87
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.87
Flight Position: [ source = BAT ]
RA: 212.473951892778 Dec: 24.4370020416008 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 212.446264784461 Dec: 24.451409377425 [deg; J2000]
{ 14h 09m 47.1s , +24d 27' 05.1" }
+/- 1.97391660345862 [arcmin] (estimated 90% radius based on SNR)
+/- 1.05310068388544 [arcmin] (formal 1-sigma fit error)
SNR: 11.5138374567525
Angular difference between Flight and Ground position is 1.741946 arcmin
Partial Coding Fraction: 0.8359375 [ including projection effects ]
Duration
T90: 68.8120000362396 +/- 10.5274431981955
Measured from: -36.4039999246597
to: 32.4080001115799 [s; relative to TRIGTIME]
T50: 32.5720000267029 +/- 6.65624066844859
Measured from: -29.5359999239445
to: 3.03600010275841 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -36.8560000061989
to: -35.8560000061989 [s; relative to TRIGTIME]
Total Fluence
Measured from: -40.5760000050068
to: 39.3000000119209 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.698136 0.783653 0.319949 -0.001485
0.055117 0.055365 0.049011 0.042513 [error]
Peak 0.021027 0.044898 0.014743 0.003405
0.009734 0.009826 0.008137 0.007125 [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 2.26e-07 2.96e-07 2.85e-07 4.88e-07 9.69e-07 1.30e-06 erg/cm2
Error 2.83e-08 2.65e-08 4.59e-08 1.55e-07 1.04e-07 2.06e-07 erg/cm2
Peak flux Power-law 2.44e-01 2.19e-01 1.35e-01 1.27e-01 6.52e-01 7.25e-01 ph/cm2/s
Error 1.22e-01 7.56e-02 6.25e-02 1.14e-01 2.24e-01 2.50e-01 ph/cm2/s
Fluence Cutoff-PL 2.06e-07 3.29e-07 2.69e-07 1.11e-07 8.82e-07 9.14e-07 erg/cm2
Error 3.33e-08 3.77e-08 5.53e-08 1.51e-07 1.17e-07 2.01e-07 erg/cm2
Peak flux Cutoff-PL 1.83e-01 2.77e-01 1.40e-01 1.60e-02 6.14e-01 6.16e-01 ph/cm2/s
Error 1.34e-01 1.08e-01 1.10e-01 9.69e-02 2.24e-01 2.31e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 2.67e-01 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.056 0.174 - - 1.31e-03 1.52e-04 40.560 57
CPL 1.067 0.896 39.0 14.3 4.86e-03 8.96e-03 36.060 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.697 0.568 - - 4.92e-03 1.84e-03 50.260 57
CPL -0.589 1.042 50.0 -19.3 8.84e-02 8.09e+00 48.320 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 79.876 -40.576 39.300
T90 68.812 -36.404 32.408
T50 32.572 -29.536 3.036
Peak 1.000 -36.856 -35.856
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
212.4463 +24.4514 0.0167 22.7 27.5 0.7161 11.5 TRIG_00353540
------------------------------------------
Foreground time interval of the image:
-7.699 39.300 (delta_t = 46.999 [sec])
Background time interval of the image:
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 -40.576 sec. to 39.300 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.05556 ( -0.169283 0.178874 )
Norm@50keV : 1.31077E-03 ( -0.000153511 0.000150539 )
------------------------------------------------------------
# Chi-Squared = 40.56 using 59 PHA bins.
# Reduced chi-squared = 0.7115 for 57 degrees of freedom
# Null hypothesis probability = 9.510550e-01
Photon flux (15-150 keV) in 79.88 sec: 0.201810 ( -0.0178165 0.0178217 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.69064e-07 ( -1.03195e-07 1.05429e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -40.576 sec. to 39.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06694 ( -0.984205 0.806859 )
Epeak [keV] : 39.0306 ( -17.2155 11.3562 )
Norm@50keV : 4.85507E-03 ( -0.00485544 0.0130743 )
------------------------------------------------------------
# Chi-Squared = 36.06 using 59 PHA bins.
# Reduced chi-squared = 0.6439 for 56 degrees of freedom
# Null hypothesis probability = 9.823642e-01
Photon flux (15-150 keV) in 79.88 sec: 0.193226 ( -0.018978 0.019015 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.8158e-07 ( -1.12011e-07 1.22448e-07 ) ergs/cm2
Band function
Time interval is from -40.576 sec. to 39.300 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.23988 ( -0.637048 1.39082 )
beta : -3.32280 ( 3.16711 1.01022 )
Epeak [keV] : 38.2919 ( -10.5959 12.3981 )
Norm@50keV : 3.88948E-03 ( -0.00389522 0.0235991 )
------------------------------------------------------------
# Chi-Squared = 36.14 using 59 PHA bins.
# Reduced chi-squared = 0.6570 for 55 degrees of freedom
# Null hypothesis probability = 9.768792e-01
Photon flux (15-150 keV) in 79.88 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -36.856 sec. to -35.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69653 ( -0.542729 0.592406 )
Norm@50keV : 4.91641E-03 ( -0.00186449 0.00180702 )
------------------------------------------------------------
# Chi-Squared = 50.26 using 59 PHA bins.
# Reduced chi-squared = 0.8818 for 57 degrees of freedom
# Null hypothesis probability = 7.238906e-01
Photon flux (15-150 keV) in 1 sec: 0.652242 ( -0.223325 0.223783 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.55446e-08 ( -1.7317e-08 1.80979e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -36.856 sec. to -35.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.588639 ( 0.608617 2.69353 )
Epeak [keV] : 49.9876 ( -11.2753 -49.9531 )
Norm@50keV : 8.84499E-02 ( -0.09195 16.0948 )
------------------------------------------------------------
# Chi-Squared = 48.32 using 59 PHA bins.
# Reduced chi-squared = 0.8629 for 56 degrees of freedom
# Null hypothesis probability = 7.573977e-01
Photon flux (15-150 keV) in 1 sec: 0.614414 ( -0.221693 0.227189 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.92623e-08 ( -1.51533e-08 1.88861e-08 ) ergs/cm2
Band function
Time interval is from -36.856 sec. to -35.856 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.470327 ( 0.54875 2.96284 )
beta : -10.00000 ( 5.20269e+07 5.20269e+07 )
Epeak [keV] : 50.3709 ( -11.6846 -49.9027 )
Norm@50keV : 7.69604E-02 ( -0.0924068 12.2791 )
------------------------------------------------------------
# Chi-Squared = 48.32 using 59 PHA bins.
# Reduced chi-squared = 0.8786 for 55 degrees of freedom
# Null hypothesis probability = 7.257964e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sat May 30 00:49:25 EDT 2009