batgrbproduct Analysis for Trigger=360091
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): Sun Aug 16 09:01:15 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger360091/GCN5_download_cron
======================================================================
Trigger: 00360091 Segment: 000
BAT Trigger Time: 272109856.832 [s; MET]
Trigger Stop: 272109857.856 [s; MET]
UTC: 2009-08-16T10:04:11.829720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 34.2343882297691 Dec: 59.9553387485713 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.19
Image Trigger?: NO
Rate S/N Ratio: 11.0453610171873 [ if not an image trigger ]
Image S/N Ratio: 6.19
Flight Position: [ source = BAT ]
RA: 34.2343882297691 Dec: 59.9553387485713 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 34.378948668542 Dec: 59.9631715311576 [deg; J2000]
{ 02h 17m 30.9s , +59d 57' 47.4" }
+/- 4.94237059261285 [arcmin] (estimated 90% radius based on SNR)
+/- 2.91646764857071 [arcmin] (formal 1-sigma fit error)
SNR: 3.10300322739989
Angular difference between Flight and Ground position is 4.367512 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: -2.98023223876953e-08
to: 1.02399995923042 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.002372 0.003995 0.026260 0.020935
0.007251 0.007929 0.007519 0.008299 [error]
Peak 0.002372 0.003995 0.026260 0.020935
0.007251 0.007929 0.007519 0.008299 [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 4.84e-10 2.77e-09 1.38e-08 2.95e-07 4.38e-08 3.12e-07 erg/cm2
Error 9.77e-10 3.22e-09 1.04e-08 4.56e-07 1.92e-08 4.59e-07 erg/cm2
Peak flux Power-law 1.47e-02 4.45e-02 1.11e-01 7.73e-01 3.00e-01 9.41e-01 ph/cm2/s
Error 3.02e-02 5.33e-02 8.45e-02 9.35e-01 2.29e-01 8.89e-01 ph/cm2/s
Fluence Cutoff-PL 1.35e-10 1.98e-09 1.63e-08 7.97e-08 4.50e-08 1.05e-07 erg/cm2
Error 4.37e-10 2.88e-09 8.73e-09 2.41e-07 1.95e-08 4.38e-07 erg/cm2
Peak flux Cutoff-PL 1.46e-02 4.45e-02 1.11e-01 7.69e-01 3.00e-01 9.39e-01 ph/cm2/s
Error 3.01e-02 5.32e-02 8.45e-02 1.02e+00 2.29e-01 9.61e-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 -0.313 1.553 - - 1.96e-03 1.85e-03 57.940 57
CPL -4.984 0.000 131.0 0.0 2.12e-02 0.00e+00 56.690 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.313 1.553 - - 1.96e-03 1.85e-03 57.940 57
CPL -4.984 0.000 131.0 0.0 2.12e-02 0.00e+00 56.690 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 -0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
34.3789 +59.9632 0.0620 32.2 177.5 0.0490 3.1 TRIG_00360091
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.832 -8.832 (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 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.312648 ( -2.11971 0.987227 )
Norm@50keV : 1.95551E-03 ( -0.00195554 0.00174868 )
------------------------------------------------------------
# Chi-Squared = 57.94 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 57 degrees of freedom
# Null hypothesis probability = 4.402932e-01
Photon flux (15-150 keV) in 1.024 sec: 0.299711 ( -0.299711 0.159175 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.37876e-08 ( -1.92182e-08 1.92193e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.98441 ( )
Epeak [keV] : 130.956 ( )
Norm@50keV : 2.12284E-02 ( )
------------------------------------------------------------
# Chi-Squared = 56.69 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 56 degrees of freedom
# Null hypothesis probability = 4.491526e-01
Photon flux (15-150 keV) in 1.024 sec: 0.299846 ( -0.299846 0.158931 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.50039e-08 ( -1.95211e-08 1.95576e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.466992 ( 0.466992 0.466992 )
beta : 0.312629 ( -0.987688 2.11968 )
Epeak [keV] : 19.3327 ( -19.3326 -19.3326 )
Norm@50keV : 2.88700E-03 ( -0.00288687 67908.7 )
------------------------------------------------------------
# Chi-Squared = 57.94 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 55 degrees of freedom
# Null hypothesis probability = 3.672770e-01
Photon flux (15-150 keV) in 1.024 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 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.312648 ( -2.11971 0.987227 )
Norm@50keV : 1.95551E-03 ( -0.00195554 0.00174868 )
------------------------------------------------------------
# Chi-Squared = 57.94 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 57 degrees of freedom
# Null hypothesis probability = 4.402932e-01
Photon flux (15-150 keV) in 1.024 sec: 0.299711 ( -0.299711 0.159175 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.37876e-08 ( -1.92182e-08 1.92193e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.98441 ( )
Epeak [keV] : 130.956 ( )
Norm@50keV : 2.12284E-02 ( )
------------------------------------------------------------
# Chi-Squared = 56.69 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 56 degrees of freedom
# Null hypothesis probability = 4.491526e-01
Photon flux (15-150 keV) in 1.024 sec: 0.299846 ( -0.299846 0.158931 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.50039e-08 ( -1.95211e-08 1.95576e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.466992 ( 0.466992 0.466992 )
beta : 0.312629 ( -0.987688 2.11968 )
Epeak [keV] : 19.3327 ( -19.3326 -19.3326 )
Norm@50keV : 2.88700E-03 ( -0.00288687 67908.7 )
------------------------------------------------------------
# Chi-Squared = 57.94 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 55 degrees of freedom
# Null hypothesis probability = 3.672770e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sun Aug 16 09:07:38 EDT 2009