batgrbproduct Analysis for Trigger=360883
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): Wed Aug 26 16:36:30 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger360883/GCN5_download_cron
======================================================================
Trigger: 00360883 Segment: 000
BAT Trigger Time: 272952382.464 [s; MET]
Trigger Stop: 272952386.56 [s; MET]
UTC: 2009-08-26T04:06:17.434100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 260.768791221776 Dec: 38.8909618789824 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.01
Image Trigger?: NO
Rate S/N Ratio: 8 [ if not an image trigger ]
Image S/N Ratio: 6.01
Flight Position: [ source = BAT ]
RA: 260.768791221776 Dec: 38.8909618789824 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 260.785702428464 Dec: 38.8268797732491 [deg; J2000]
{ 17h 23m 08.6s , +38d 49' 36.8" }
+/- 4.14989684411758 [arcmin] (estimated 90% radius based on SNR)
+/- 3.18053202000141 [arcmin] (formal 1-sigma fit error)
SNR: 3.98297838373581
Angular difference between Flight and Ground position is 3.925270 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 4.09600001573563 +/-
Measured from: 0
to: 4.09600001573563 [s; relative to TRIGTIME]
T50: 4.09600001573563 +/-
Measured from: 0
to: 4.09600001573563 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 4.09600001573563 second)
Measured from: -2.98023223876953e-08
to: 4.0959999859333 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 4.09600001573563 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.002755 0.035953 0.041907 -0.000661
0.012498 0.013106 0.011880 0.010381 [error]
Peak -0.002755 0.035953 0.041907 -0.000661
0.012498 0.013106 0.011880 0.010381 [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 4.55e-09 1.18e-08 2.44e-08 1.29e-07 6.57e-08 1.71e-07 erg/cm2
Error 3.58e-09 5.98e-09 1.09e-08 1.50e-07 2.90e-08 1.35e-07 erg/cm2
Peak flux Power-law 3.55e-02 4.96e-02 5.13e-02 9.76e-02 1.67e-01 2.34e-01 ph/cm2/s
Error 2.83e-02 2.59e-02 2.27e-02 8.87e-02 7.23e-02 1.08e-01 ph/cm2/s
Fluence Cutoff-PL 2.15e-09 1.47e-08 3.01e-08 9.77e-09 5.55e-08 5.62e-08 erg/cm2
Error 2.48e-09 7.51e-09 1.38e-08 4.62e-08 2.61e-08 5.24e-08 erg/cm2
Peak flux Cutoff-PL 1.54e-02 5.89e-02 6.68e-02 1.26e-02 1.52e-01 1.54e-01 ph/cm2/s
Error 1.18e-02 3.11e-02 2.99e-02 3.93e-02 6.31e-02 6.81e-02 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 0.946 0.685 - - 1.45e-03 6.31e-04 59.790 57
CPL -2.534 -0.196 71.5 82.1 5.05e-02 2.88e-01 56.430 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.946 0.685 - - 1.45e-03 6.31e-04 59.790 57
CPL -2.534 -0.196 71.5 82.1 5.05e-02 2.88e-01 56.430 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 4.096 0.000 4.096
T90 4.096 0.000 4.096
T50 4.096 0.000 4.096
Peak 4.096 -0.000 4.096
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
260.7857 +38.8269 0.0482 23.6 -136.2 0.1007 4.0 TRIG_00360883
------------------------------------------
Foreground time interval of the image:
0.000 4.096 (delta_t = 4.096 [sec])
Background time interval of the image:
-60.464 -14.464 (delta_t = 46.000 [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 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.945504 ( -0.730237 0.639486 )
Norm@50keV : 1.45326E-03 ( -0.000634145 0.000628174 )
------------------------------------------------------------
# Chi-Squared = 59.79 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 57 degrees of freedom
# Null hypothesis probability = 3.746721e-01
Photon flux (15-150 keV) in 4.096 sec: 0.167187 ( -0.0710581 0.0736386 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.56773e-08 ( -2.83623e-08 2.95455e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.53353 ( 3.11609 2.72445 )
Epeak [keV] : 71.5179 ( -19.6184 144.561 )
Norm@50keV : 5.04503E-02 ( -0.107428 0.468299 )
------------------------------------------------------------
# Chi-Squared = 56.43 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 56 degrees of freedom
# Null hypothesis probability = 4.587497e-01
Photon flux (15-150 keV) in 4.096 sec: 0.152413 ( -0.0582311 0.067942 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.54824e-08 ( -2.28768e-08 2.93732e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.35316 ( -2.75114 -1.71119 )
beta : -10.00000 ( 2.58805e+06 2.58806e+06 )
Epeak [keV] : 68.0558 ( -18.9738 145.599 )
Norm@50keV : 0.121788 ( -0.122883 0.372656 )
------------------------------------------------------------
# Chi-Squared = 56.27 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 55 degrees of freedom
# Null hypothesis probability = 4.269801e-01
Photon flux (15-150 keV) in 4.096 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 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.945504 ( -0.730237 0.639486 )
Norm@50keV : 1.45326E-03 ( -0.000634145 0.000628174 )
------------------------------------------------------------
# Chi-Squared = 59.79 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 57 degrees of freedom
# Null hypothesis probability = 3.746721e-01
Photon flux (15-150 keV) in 4.096 sec: 0.167187 ( -0.0710581 0.0736386 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.56773e-08 ( -2.83623e-08 2.95454e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.53353 ( 3.11609 2.72445 )
Epeak [keV] : 71.5179 ( -19.6184 144.561 )
Norm@50keV : 5.04503E-02 ( -0.107428 0.468299 )
------------------------------------------------------------
# Chi-Squared = 56.43 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 56 degrees of freedom
# Null hypothesis probability = 4.587497e-01
Photon flux (15-150 keV) in 4.096 sec: 0.152413 ( -0.0582311 0.067942 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.54824e-08 ( -2.28768e-08 2.93732e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.35316 ( -2.75114 -1.71119 )
beta : -10.00000 ( 2.58805e+06 2.58806e+06 )
Epeak [keV] : 68.0558 ( -18.9738 145.599 )
Norm@50keV : 0.121788 ( -0.122883 0.372656 )
------------------------------------------------------------
# Chi-Squared = 56.27 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 55 degrees of freedom
# Null hypothesis probability = 4.269801e-01
Photon flux (15-150 keV) in 4.096 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Wed Aug 26 16:46:05 EDT 2009