batgrbproduct Analysis for Trigger=355981
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): Tue Jun 30 03:47:43 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger355981/GCN5_download_cron
======================================================================
Trigger: 00355981 Segment: 000
BAT Trigger Time: 267985715.584 [s; MET]
Trigger Stop: 267985715.84 [s; MET]
UTC: 2009-06-29T16:28:30.715480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 242.698293872996 Dec: 3.63263573013226 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.8
Image Trigger?: NO
Rate S/N Ratio: 42.1307488658818 [ if not an image trigger ]
Image S/N Ratio: 5.8
Flight Position: [ source = BAT ]
RA: 242.698293872996 Dec: 3.63263573013226 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 242.6848723922 Dec: 3.58566757400932 [deg; J2000]
{ 16h 10m 44.4s , +03d 35' 08.4" }
+/- 3.41222490273088 [arcmin] (estimated 90% radius based on SNR)
+/- 1.76487532299046 [arcmin] (formal 1-sigma fit error)
SNR: 5.26788184488658
Angular difference between Flight and Ground position is 2.930452 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 0.256000012159348 +/-
Measured from: 0
to: 0.256000012159348 [s; relative to TRIGTIME]
T50: 0.256000012159348 +/-
Measured from: 0
to: 0.256000012159348 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.256000012159348 second)
Measured from: 1.49011611938477e-08
to: 0.256000027060509 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.256000012159348 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.007370 0.014984 -0.000164 0.000573
0.002897 0.002821 0.002477 0.002221 [error]
Peak 0.007370 0.014984 -0.000164 0.000573
0.002897 0.002821 0.002477 0.002221 [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 2.44e-09 3.01e-09 2.70e-09 4.20e-09 9.61e-09 1.24e-08 erg/cm2
Error 1.14e-09 1.19e-09 1.62e-09 5.16e-09 4.19e-09 7.06e-09 erg/cm2
Peak flux Power-law 3.12e-01 2.13e-01 9.57e-02 5.96e-02 6.50e-01 6.80e-01 ph/cm2/s
Error 1.48e-01 8.33e-02 5.58e-02 6.88e-02 2.51e-01 2.63e-01 ph/cm2/s
Fluence Cutoff-PL 2.04e-09 4.83e-09 1.55e-09 2.80e-11 9.20e-09 8.43e-09 erg/cm2
Error 1.04e-09 1.67e-09 1.64e-09 2.62e-10 3.09e-09 3.06e-09 erg/cm2
Peak flux Cutoff-PL 2.46e-01 3.41e-01 6.40e-02 5.18e-04 6.51e-01 6.51e-01 ph/cm2/s
Error 1.30e-01 1.16e-01 6.68e-02 6.17e-03 2.22e-01 2.22e-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 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 2.155 0.624 - - 4.02e-03 1.92e-03 89.480 57
CPL -4.821 0.000 36.0 7.0 7.35e+01 5.03e+01 83.270 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.155 0.624 - - 4.02e-03 1.92e-03 89.480 57
CPL -4.821 0.000 36.0 7.0 7.35e+01 5.03e+01 83.270 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 0.256 0.000 0.256
T90 0.256 0.000 0.256
T50 0.256 0.000 0.256
Peak 0.256 0.000 0.256
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
242.6849 +3.5857 0.0364 20.3 14.3 0.0278 5.3 TRIG_00355981
------------------------------------------
Foreground time interval of the image:
0.000 0.256 (delta_t = 0.256 [sec])
Background time interval of the image:
-24.283 -3.584 (delta_t = 20.699 [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 0.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.15525 ( -0.544493 0.704391 )
Norm@50keV : 4.02304E-03 ( -0.00195456 0.00188021 )
------------------------------------------------------------
# Chi-Squared = 89.48 using 59 PHA bins.
# Reduced chi-squared = 1.570 for 57 degrees of freedom
# Null hypothesis probability = 3.874813e-03
Photon flux (15-150 keV) in 0.256 sec: 0.650063 ( -0.251093 0.251221 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.61047e-09 ( -4.11098e-09 4.27827e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.82131 ( )
Epeak [keV] : 35.9648 ( -6.49735 7.41734 )
Norm@50keV : 73.5476 ( -73.5554 27.0153 )
------------------------------------------------------------
# Chi-Squared = 83.27 using 59 PHA bins.
# Reduced chi-squared = 1.487 for 56 degrees of freedom
# Null hypothesis probability = 1.049078e-02
Photon flux (15-150 keV) in 0.256 sec: 0.650737 ( -0.220857 0.223514 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.19967e-09 ( -3.02228e-09 3.15548e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.256 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97340 ( -83.8057 -73.806 )
beta : -7.20790 ( 5.8498 15.0399 )
Epeak [keV] : 35.8824 ( -6.31835 7.34999 )
Norm@50keV : 91.9855 ( -50.0544 170.466 )
------------------------------------------------------------
# Chi-Squared = 83.21 using 59 PHA bins.
# Reduced chi-squared = 1.513 for 55 degrees of freedom
# Null hypothesis probability = 8.356770e-03
Photon flux (15-150 keV) in 0.256 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 0.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.15525 ( -0.544493 0.704391 )
Norm@50keV : 4.02304E-03 ( -0.00195456 0.00188021 )
------------------------------------------------------------
# Chi-Squared = 89.48 using 59 PHA bins.
# Reduced chi-squared = 1.570 for 57 degrees of freedom
# Null hypothesis probability = 3.874813e-03
Photon flux (15-150 keV) in 0.256 sec: 0.650063 ( -0.251093 0.251221 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.61047e-09 ( -4.11098e-09 4.27827e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.82131 ( )
Epeak [keV] : 35.9648 ( -6.49735 7.41734 )
Norm@50keV : 73.5476 ( -73.5554 27.0153 )
------------------------------------------------------------
# Chi-Squared = 83.27 using 59 PHA bins.
# Reduced chi-squared = 1.487 for 56 degrees of freedom
# Null hypothesis probability = 1.049078e-02
Photon flux (15-150 keV) in 0.256 sec: 0.650737 ( -0.220857 0.223514 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.19967e-09 ( -3.02228e-09 3.15548e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.256 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97340 ( -83.8055 -73.806 )
beta : -7.20790 ( 5.8498 15.0399 )
Epeak [keV] : 35.8824 ( -6.31835 7.34999 )
Norm@50keV : 91.9855 ( -50.0544 131.458 )
------------------------------------------------------------
# Chi-Squared = 83.21 using 59 PHA bins.
# Reduced chi-squared = 1.513 for 55 degrees of freedom
# Null hypothesis probability = 8.356770e-03
Photon flux (15-150 keV) in 0.256 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Tue Jun 30 04:00:53 EDT 2009