batgrbproduct Analysis for Trigger=355083
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 v2.45
Process Start Time (local time): Thu Jun 18 23:12:01 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger355083/GCN5_download_cron
======================================================================
Trigger: 00355083 Segment: 000
BAT Trigger Time: 267006514.688 [s; MET]
Trigger Stop: 267006515.712 [s; MET]
UTC: 2009-06-18T08:28:29.851180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 294.021186499589 Dec: 78.3535968964309 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 22.57
Image Trigger?: NO
Rate S/N Ratio: 85.8370549354997 [ if not an image trigger ]
Image S/N Ratio: 22.57
Flight Position: [ source = BAT ]
RA: 294.021186499589 Dec: 78.3535968964309 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 294.007899003661 Dec: 78.3519470015134 [deg; J2000]
{ 19h 36m 01.9s , +78d 21' 07.0" }
+/- 0.459963460374932 [arcmin] (estimated 90% radius based on SNR)
+/- 0.138384553040033 [arcmin] (formal 1-sigma fit error)
SNR: 92.2448630843664
Angular difference between Flight and Ground position is 0.188959 arcmin
Partial Coding Fraction: 0.625 [ including projection effects ]
Duration
T90: 113.208000004292 +/- 0.593538562159812
Measured from: 10.2360000908375
to: 123.444000095129 [s; relative to TRIGTIME]
T50: 27.0840000212193 +/- 0.13971398319721
Measured from: 60.9080000817776
to: 87.9920001029968 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 65.3840000033379
to: 66.3840000033379 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.99599999189377
to: 213.872000008821 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 51.206435 64.640782 46.088744 10.153736
0.129103 0.142078 0.128498 0.087226 [error]
Peak 1.153055 1.692015 1.386096 0.351589
0.018098 0.021464 0.020594 0.013253 [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 1.78e-05 2.88e-05 3.51e-05 8.42e-05 1.06e-04 1.66e-04 erg/cm2
Error 4.54e-07 4.57e-07 3.55e-07 1.80e-06 1.18e-06 1.87e-06 erg/cm2
Peak flux Power-law 1.24e+01 1.28e+01 9.42e+00 1.11e+01 3.89e+01 4.57e+01 ph/cm2/s
Error 4.88e-01 3.02e-01 1.92e-01 4.97e-01 8.27e-01 8.44e-01 ph/cm2/s
Fluence Cutoff-PL 1.59e-05 2.85e-05 3.65e-05 6.74e-05 1.05e-04 1.48e-04 erg/cm2
Error 6.49e-07 4.73e-07 5.12e-07 3.93e-06 1.21e-06 4.19e-06 erg/cm2
Peak flux Cutoff-PL 1.13e+01 1.29e+01 9.74e+00 8.66e+00 3.80e+01 4.26e+01 ph/cm2/s
Error 6.66e-01 3.12e-01 2.44e-01 1.04e+00 9.09e-01 1.50e+00 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 0.00e+00 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 1.713 0.018 - - 5.25e-02 6.20e-04 57.030 57
CPL 1.414 0.081 134.7 19.1 6.75e-02 4.46e-03 15.540 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.446 0.034 - - 3.16e-01 5.85e-03 52.410 57
CPL 1.153 0.144 170.4 68.7 4.22e-01 5.88e-02 39.700 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: 107.712000 sec.
T50 in the 50-300 keV band: 23.104000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 218.868 -4.996 213.872
T90 113.208 10.236 123.444
T50 27.084 60.908 87.992
Peak 1.000 65.384 66.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
294.0079 +78.3519 0.0021 31.1 23.6 28.0540 92.2 TRIG_00355083
------------------------------------------
Foreground time interval of the image:
-4.996 53.813 (delta_t = 58.809 [sec])
Background time interval of the image:
-239.688 -78.758 (delta_t = 160.930 [sec])
-77.688 -4.996 (delta_t = 72.692 [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
Multiple GTIs in the spectrum
tstart tstop
-4.996000 108.052000
109.312000 213.872000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71263 ( -0.018401 0.0183194 )
Norm@50keV : 5.25094E-02 ( -0.000620201 0.00061888 )
------------------------------------------------------------
# Chi-Squared = 57.03 using 59 PHA bins.
# Reduced chi-squared = 1.000 for 57 degrees of freedom
# Null hypothesis probability = 4.740478e-01
Photon flux (15-150 keV) in 217.6 sec: 7.00487 ( -0.112838 0.113409 ) ph/cm2/s
Energy fluence (15-150 keV) : 0.00010569 ( -1.17927e-06 1.18026e-06 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-4.996000 108.052000
109.312000 213.872000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41409 ( -0.0812219 0.0800649 )
Epeak [keV] : 134.684 ( -14.4221 23.8664 )
Norm@50keV : 6.74574E-02 ( -0.00429184 0.00462784 )
------------------------------------------------------------
# Chi-Squared = 15.54 using 59 PHA bins.
# Reduced chi-squared = 0.2776 for 56 degrees of freedom
# Null hypothesis probability = 1.000000e+00
Photon flux (15-150 keV) in 217.6 sec: 6.72111 ( -0.13042 0.13176 ) ph/cm2/s
Energy fluence (15-150 keV) : 0.000104538 ( -1.20659e-06 1.20855e-06 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-4.996000 108.052000
109.312000 213.872000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.41408 ( -0.037989 0.0929347 )
beta : -10.00000 ( 2.30628e+13 2.30628e+13 )
Epeak [keV] : 134.660 ( -14.4209 23.8596 )
Norm@50keV : 6.74471E-02 ( -0.0042916 0.00462898 )
------------------------------------------------------------
# Chi-Squared = 15.54 using 59 PHA bins.
# Reduced chi-squared = 0.2826 for 55 degrees of freedom
# Null hypothesis probability = 1.000000e+00
Photon flux (15-150 keV) in 217.6 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 65.384 sec. to 66.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44615 ( -0.034106 0.0341034 )
Norm@50keV : 0.316095 ( -0.00585234 0.00585079 )
------------------------------------------------------------
# Chi-Squared = 52.41 using 59 PHA bins.
# Reduced chi-squared = 0.9195 for 57 degrees of freedom
# Null hypothesis probability = 6.477039e-01
Photon flux (15-150 keV) in 1 sec: 38.9173 ( -0.826139 0.828743 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.02695e-06 ( -5.68958e-08 5.69125e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 65.384 sec. to 66.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15328 ( -0.146007 0.141805 )
Epeak [keV] : 170.430 ( -37.3792 100.038 )
Norm@50keV : 0.422022 ( -0.0539242 0.063706 )
------------------------------------------------------------
# Chi-Squared = 39.70 using 59 PHA bins.
# Reduced chi-squared = 0.7089 for 56 degrees of freedom
# Null hypothesis probability = 9.512282e-01
Photon flux (15-150 keV) in 1 sec: 38.0351 ( -0.9102 0.9087 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.98775e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 65.384 sec. to 66.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.856541 ( -0.389016 0.736066 )
beta : -1.57605 ( 1.57608 0.0833306 )
Epeak [keV] : 92.8692 ( -38.8275 129.176 )
Norm@50keV : 0.618157 ( -0.231928 1.16697 )
------------------------------------------------------------
# Chi-Squared = 38.22 using 59 PHA bins.
# Reduced chi-squared = 0.6949 for 55 degrees of freedom
# Null hypothesis probability = 9.585792e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Thu Jun 18 23:32:33 EDT 2009