batgrbproduct Analysis for Trigger=341114
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 Jan 26 08:30:53 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger341114/GCN5_download_cron
======================================================================
Trigger: 00341114 Segment: 000
BAT Trigger Time: 254613137.608 [s; MET]
Trigger Stop: 254613137.616 [s; MET]
UTC: 2009-01-25T21:52:13.162160 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 237.728806211538 Dec: -54.3028783954379 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.87
Image Trigger?: NO
Rate S/N Ratio: 160.866404199261 [ if not an image trigger ]
Image S/N Ratio: 18.87
Flight Position: [ source = BAT ]
RA: 237.728806211538 Dec: -54.3028783954379 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 237.712160736086 Dec: -54.3111094789258 [deg; J2000]
{ 15h 50m 50.9s , -54d 18' 40.0" }
+/- 1.21661182209036 [arcmin] (estimated 90% radius based on SNR)
+/- 0.4474693150046 [arcmin] (formal 1-sigma fit error)
SNR: 22.9864878466769
Angular difference between Flight and Ground position is 0.763834 arcmin
Partial Coding Fraction: 0.2734375 [ including projection effects ]
Duration
T90: 1.08400002121925 +/- 0.19015781709751
Measured from: -0.979999929666519
to: 0.104000091552734 [s; relative to TRIGTIME]
T50: 0.0520000159740448 +/- 0.0329848540256443
Measured from: -0.0359999239444733
to: 0.0160000920295715 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.828000009059906
to: 0.171999990940094 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.21200001239777
to: 0.171999990940094 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.330009 0.351659 0.165216 0.026620
0.020350 0.019555 0.016145 0.013338 [error]
Peak 0.319946 0.326578 0.137079 0.018812
0.018519 0.017907 0.014222 0.011611 [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 1.38e-07 1.59e-07 1.30e-07 1.80e-07 4.93e-07 6.43e-07 erg/cm2
Error 1.37e-08 1.08e-08 1.55e-08 4.18e-08 3.66e-08 0.00e+00 erg/cm2
Peak flux Power-law 4.40e+00 2.65e+00 1.02e+00 5.25e-01 8.35e+00 8.60e+00 ph/cm2/s
Error 4.31e-01 1.79e-01 1.18e-01 1.13e-01 5.85e-01 5.88e-01 ph/cm2/s
Fluence Cutoff-PL 1.25e-07 1.74e-07 1.29e-07 5.68e-08 4.66e-07 5.44e-07 erg/cm2
Error 1.63e-08 1.45e-08 1.78e-08 4.38e-08 3.98e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 3.86e+00 2.93e+00 1.03e+00 1.80e-01 7.96e+00 8.00e+00 ph/cm2/s
Error 5.21e-01 2.37e-01 1.37e-01 1.15e-01 6.18e-01 6.35e-01 ph/cm2/s
Fluence Band 1.23e-07 1.73e-07 1.29e-07 5.61e-08 4.65e-07 5.46e-07 erg/cm2
Error 1.61e-08 1.45e-08 1.77e-08 4.32e-08 3.97e-08 0.00e+00 erg/cm2
Peak flux Band 3.86e+00 2.93e+00 1.03e+00 1.81e-01 7.97e+00 8.00e+00 ph/cm2/s
Error 5.21e-01 2.37e-01 1.37e-01 1.11e-01 4.64e-01 4.77e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.282 0.132 - - 3.74e-02 3.23e-03 56.144 57
CPL 1.411 0.608 29.6 15.6 1.14e-01 1.02e-01 48.877 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.378 0.130 - - 4.57e-02 4.00e-03 56.071 57
CPL 1.343 0.625 27.5 17.6 1.73e-01 1.62e-01 46.156 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: 1.344000 sec.
T50 in the 50-300 keV band: 0.704000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.384 -1.212 0.172
T90 1.084 -0.980 0.104
T50 0.052 -0.036 0.016
Peak 1.000 -0.828 0.172
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
237.7122 -54.3111 0.0083 45.8 -34.9 0.9121 23.0 TRIG_00341114
------------------------------------------
Foreground time interval of the image:
-1.212 0.172 (delta_t = 1.384 [sec])
Background time interval of the image:
-145.907 -1.212 (delta_t = 144.695 [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 -1.212 sec. to 0.172 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28234 ( -0.128615 0.134664 )
Norm@50keV : 3.740406E-02 ( -3.251601E-03 3.199864E-03) )
------------------------------------------------------------
Chi-Squared = 56.14395 using 59 PHA bins.
Reduced chi-squared = 0.9849815 for 57 degrees of freedom
Null hypothesis probability = 0.507
Photon flux (15-150 keV) in 1.384 sec: 6.47309 ( -0.45609 0.45723 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.9309e-07 ( -3.63978e-08 3.67604e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.212 sec. to 0.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41087 ( -0.647642 0.568251 )
Epeak [keV] : 29.5618 ( -22.7487 8.54869 )
Norm@50keV : 0.113752 ( -5.784303E-02 0.145510 )
------------------------------------------------------------
Chi-Squared = 48.87746 using 59 PHA bins.
Reduced chi-squared = 0.8728118 for 56 degrees of freedom
Null hypothesis probability = 0.739
Photon flux (15-150 keV) in 1.384 sec: 6.20509 ( -0.48407 0.48599 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.66104e-07 ( -3.96336e-08 3.98855e-08 ) ergs/cm2
Band function
Time interval is from -1.212 sec. to 0.172 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.45024 ( -0.486333 0.346057 )
beta : -9.32711 ( -0.672891 6.82501 )
Epeak [keV] : 28.9285 ( -12.5865 9.18887 )
Norm@50keV : 0.108144 ( -4.905884E-02 0.151690 )
------------------------------------------------------------
Chi-Squared = 48.89019 using 59 PHA bins.
Reduced chi-squared = 0.8889126 for 55 degrees of freedom
Null hypothesis probability = 0.706
Photon flux (15-150 keV) in 1.384 sec: 6.20664 ( -0.48565 0.4842 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.65041e-07 ( -3.92724e-08 4.00765e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.828 sec. to 0.172 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.37759 ( -0.127006 0.133414 )
Norm@50keV : 4.571378E-02 ( -4.031803E-03 3.968447E-03) )
------------------------------------------------------------
Chi-Squared = 56.07052 using 59 PHA bins.
Reduced chi-squared = 0.9836933 for 57 degrees of freedom
Null hypothesis probability = 0.510
Photon flux (15-150 keV) in 1.000 sec: 8.34859 ( -0.58392 0.58537 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.43701e-07 ( -3.2181e-08 3.2379e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.828 sec. to 0.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34285 ( -0.665111 0.585871 )
Epeak [keV] : 27.4578 ( -27.4478 7.82940 )
Norm@50keV : 0.173143 ( -9.055568E-02 0.232866 )
------------------------------------------------------------
Chi-Squared = 46.15644 using 59 PHA bins.
Reduced chi-squared = 0.8242222 for 56 degrees of freedom
Null hypothesis probability = 0.823
Photon flux (15-150 keV) in 1.000 sec: 7.96358 ( -0.61754 0.61945 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.18208e-07 ( -3.4398e-08 3.4379e-08 ) ergs/cm2
Band function
Time interval is from -0.828 sec. to 0.172 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.79761 ( -0.210644 5.049908E-02) )
beta : -9.37113 ( -0.628873 6.80985 )
Epeak [keV] : 13.1705 ( -9.75321 8.92653 )
Norm@50keV : 0.103963 ( -7.513493E-02 0.245983 )
------------------------------------------------------------
Chi-Squared = 48.28823 using 59 PHA bins.
Reduced chi-squared = 0.8779678 for 55 degrees of freedom
Null hypothesis probability = 0.727
Photon flux (15-150 keV) in 1.000 sec: 7.96525 ( -0.6194 0.30947 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.17422e-07 ( -3.4231e-08 3.4396e-08 ) ergs/cm2
Plot creation:
Mon Jan 26 08:55:07 EST 2009