batgrbproduct Analysis for Trigger=353211
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): Wed May 27 00:00:42 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger353211/GCN5_download_cron
======================================================================
Trigger: 00353211 Segment: 000
BAT Trigger Time: 265042760.704 [s; MET]
Trigger Stop: 265042761.216 [s; MET]
UTC: 2009-05-26T14:59:15.930020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 252.718864125473 Dec: 58.8773099649887 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.67
Image Trigger?: NO
Rate S/N Ratio: 31.8747549010185 [ if not an image trigger ]
Image S/N Ratio: 5.67
Flight Position: [ source = BAT ]
RA: 252.718864125473 Dec: 58.8773099649887 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 252.687569942909 Dec: 58.9462793888847 [deg; J2000]
{ 16h 50m 45.0s , +58d 56' 46.6" }
+/- 4.11181837518578 [arcmin] (estimated 90% radius based on SNR)
+/- 3.09788474693672 [arcmin] (formal 1-sigma fit error)
SNR: 4.03577607491753
Angular difference between Flight and Ground position is 4.250225 arcmin
Partial Coding Fraction: 0.2851562 [ including projection effects ]
Duration
T90: 0.511999994516373 +/-
Measured from: 0
to: 0.511999994516373 [s; relative to TRIGTIME]
T50: 0.511999994516373 +/-
Measured from: 0
to: 0.511999994516373 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.511999994516373 second)
Measured from: -1.49011611938477e-08
to: 0.511999979615211 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.511999994516373 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.015741 0.027853 0.020476 -0.005753
0.008867 0.008732 0.007228 0.005756 [error]
Peak 0.015741 0.027853 0.020476 -0.005753
0.008867 0.008732 0.007228 0.005756 [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 6.98e-09 8.34e-09 7.22e-09 1.07e-08 2.63e-08 3.31e-08 erg/cm2
Error 4.28e-09 3.94e-09 3.74e-09 1.10e-08 1.21e-08 1.63e-08 erg/cm2
Peak flux Power-law 4.45e-01 2.96e-01 1.28e-01 7.61e-02 9.07e-01 9.43e-01 ph/cm2/s
Error 2.77e-01 1.41e-01 6.52e-02 6.19e-02 4.51e-01 4.58e-01 ph/cm2/s
Fluence Cutoff-PL 3.78e-09 1.57e-08 1.31e-08 9.79e-10 3.36e-08 3.36e-08 erg/cm2
Error 3.63e-09 6.33e-09 9.65e-09 2.07e-09 1.22e-08 1.23e-08 erg/cm2
Peak flux Cutoff-PL 2.26e-01 5.28e-01 2.48e-01 1.05e-02 1.01e+00 1.01e+00 ph/cm2/s
Error 1.90e-01 2.19e-01 1.84e-01 2.03e-02 4.06e-01 4.05e-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 1.05e+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 2.218 0.569 - - 5.44e-03 2.54e-03 81.360 57
CPL -2.460 0.218 48.3 11.0 1.40e+00 9.93e+00 73.210 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.218 0.569 - - 5.44e-03 2.54e-03 81.360 57
CPL -2.460 0.218 48.3 11.0 1.40e+00 9.93e+00 73.210 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.512 0.000 0.512
T90 0.512 0.000 0.512
T50 0.512 0.000 0.512
Peak 0.512 -0.000 0.512
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
252.6876 +58.9463 0.0477 50.2 -165.7 0.0608 4.0 TRIG_00353211
------------------------------------------
Foreground time interval of the image:
0.000 0.512 (delta_t = 0.512 [sec])
Background time interval of the image:
-60.704 -8.704 (delta_t = 52.000 [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 0.000 sec. to 0.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.21762 ( -0.552172 0.58534 )
Norm@50keV : 5.44436E-03 ( -0.00253952 0.00253115 )
------------------------------------------------------------
# Chi-Squared = 81.36 using 59 PHA bins.
# Reduced chi-squared = 1.427 for 57 degrees of freedom
# Null hypothesis probability = 1.875650e-02
Photon flux (15-150 keV) in 0.512 sec: 0.907335 ( -0.442747 0.459237 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62905e-08 ( -1.20684e-08 1.20687e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.512 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.46045 ( 2.62997 3.06696 )
Epeak [keV] : 48.3453 ( -11.1136 10.954 )
Norm@50keV : 1.39657 ( -1.71432 18.1448 )
------------------------------------------------------------
# Chi-Squared = 73.21 using 59 PHA bins.
# Reduced chi-squared = 1.307 for 56 degrees of freedom
# Null hypothesis probability = 6.107938e-02
Photon flux (15-150 keV) in 0.512 sec: 1.01211 ( -0.381686 0.42968 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.35632e-08 ( -1.21284e-08 1.23143e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.512 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.76879 ( -2.90131 -2.48318 )
beta : -9.37167 ( 10 19.9978 )
Epeak [keV] : 51.8744 ( -14.7025 10.77 )
Norm@50keV : 4.09675 ( -2.1361 30.2022 )
------------------------------------------------------------
# Chi-Squared = 73.69 using 59 PHA bins.
# Reduced chi-squared = 1.340 for 55 degrees of freedom
# Null hypothesis probability = 4.701584e-02
Photon flux (15-150 keV) in 0.512 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 0.000 sec. to 0.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.21762 ( -0.552172 0.58534 )
Norm@50keV : 5.44436E-03 ( -0.00253952 0.00253115 )
------------------------------------------------------------
# Chi-Squared = 81.36 using 59 PHA bins.
# Reduced chi-squared = 1.427 for 57 degrees of freedom
# Null hypothesis probability = 1.875650e-02
Photon flux (15-150 keV) in 0.512 sec: 0.907335 ( -0.442774 0.459237 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62905e-08 ( -1.20684e-08 1.20687e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.512 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.46045 ( 2.62997 3.06696 )
Epeak [keV] : 48.3453 ( -11.1136 10.954 )
Norm@50keV : 1.39657 ( -1.71432 18.1448 )
------------------------------------------------------------
# Chi-Squared = 73.21 using 59 PHA bins.
# Reduced chi-squared = 1.307 for 56 degrees of freedom
# Null hypothesis probability = 6.107938e-02
Photon flux (15-150 keV) in 0.512 sec: 1.01211 ( -0.381686 0.42968 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.35632e-08 ( -1.21284e-08 1.23143e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.512 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.76879 ( -2.90133 -2.48318 )
beta : -9.37167 ( 10 19.9978 )
Epeak [keV] : 51.8744 ( -14.7026 10.77 )
Norm@50keV : 4.09675 ( -2.1361 30.2022 )
------------------------------------------------------------
# Chi-Squared = 73.69 using 59 PHA bins.
# Reduced chi-squared = 1.340 for 55 degrees of freedom
# Null hypothesis probability = 4.701584e-02
Photon flux (15-150 keV) in 0.512 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Wed May 27 00:08:53 EDT 2009