batgrbproduct Analysis for Trigger=374603
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 Nov 3 03:47:45 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger374603/GCN5_download_cron
======================================================================
Trigger: 00374603 Segment: 000
BAT Trigger Time: 278867968 [s; MET]
Trigger Stop: 278868032 [s; MET]
UTC: 2009-11-02T15:19:22.774660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 268.05053931012 Dec: -22.3410897355169 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.29
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.29
Flight Position: [ source = BAT ]
RA: 268.05053931012 Dec: -22.3410897355169 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 268.045031459538 Dec: -22.3447030269375 [deg; J2000]
{ 17h 52m 10.8s , -22d 20' 40.9" }
+/- 2.62073548630608 [arcmin] (estimated 90% radius based on SNR)
+/- 1.10176376991727 [arcmin] (formal 1-sigma fit error)
SNR: 7.68017235953911
Angular difference between Flight and Ground position is 0.374740 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.401178 0.402959 0.317268 0.065889
0.066258 0.068054 0.066229 0.077948 [error]
Peak 0.401178 0.402959 0.317268 0.065889
0.066258 0.068054 0.066229 0.077948 [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 1.18e-07 1.99e-07 2.57e-07 6.68e-07 7.58e-07 1.24e-06 erg/cm2
Error 3.08e-08 3.25e-08 6.63e-08 3.70e-07 1.54e-07 4.28e-07 erg/cm2
Peak flux Power-law 5.95e-02 5.53e-02 3.57e-02 3.54e-02 1.65e-01 1.86e-01 ph/cm2/s
Error 1.59e-02 9.12e-03 8.86e-03 1.81e-02 2.69e-02 3.16e-02 ph/cm2/s
Fluence Cutoff-PL 1.18e-07 2.00e-07 2.57e-07 6.62e-07 7.58e-07 1.24e-06 erg/cm2
Error 3.08e-08 3.26e-08 6.64e-08 3.67e-07 1.54e-07 4.25e-07 erg/cm2
Peak flux Cutoff-PL 5.94e-02 5.53e-02 3.57e-02 3.52e-02 1.65e-01 1.86e-01 ph/cm2/s
Error 1.59e-02 9.12e-03 8.87e-03 1.80e-02 2.69e-02 3.15e-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 1.633 0.318 - - 1.27e-03 2.36e-04 52.140 57
CPL 1.626 0.718 9986.1 0.0 1.26e-03 1.83e-03 52.160 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.633 0.318 - - 1.27e-03 2.36e-04 52.140 57
CPL 1.626 0.718 9986.1 0.0 1.26e-03 1.83e-03 52.160 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
268.0450 -22.3447 0.0248 34.6 -16.7 1.2187 7.7 TRIG_00374603
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63331 ( -0.311636 0.324398 )
Norm@50keV : 1.27147E-03 ( -0.000239811 0.000231741 )
------------------------------------------------------------
# Chi-Squared = 52.14 using 59 PHA bins.
# Reduced chi-squared = 0.9148 for 57 degrees of freedom
# Null hypothesis probability = 6.575054e-01
Photon flux (15-150 keV) in 64 sec: 0.165120 ( -0.0268688 0.0268808 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.58118e-07 ( -1.50874e-07 1.56636e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62641 ( -0.940105 0.496174 )
Epeak [keV] : 9986.13 ( )
Norm@50keV : 1.26160E-03 ( -0.000241028 0.00341936 )
------------------------------------------------------------
# Chi-Squared = 52.16 using 59 PHA bins.
# Reduced chi-squared = 0.9314 for 56 degrees of freedom
# Null hypothesis probability = 6.210721e-01
Photon flux (15-150 keV) in 64 sec: 0.165057 ( -0.02686 0.026871 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.58022e-07 ( -1.50875e-07 1.56653e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.87505 ( -17.2634 -17.2634 )
beta : -1.68055 ( -0.491288 0.333515 )
Epeak [keV] : 21.2746 ( -21.2647 8.5212 )
Norm@50keV : 331.884 ( -333.685 260.538 )
------------------------------------------------------------
# Chi-Squared = 51.88 using 59 PHA bins.
# Reduced chi-squared = 0.9433 for 55 degrees of freedom
# Null hypothesis probability = 5.946170e-01
Photon flux (15-150 keV) in 64 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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63331 ( -0.311636 0.324398 )
Norm@50keV : 1.27147E-03 ( -0.000239811 0.000231741 )
------------------------------------------------------------
# Chi-Squared = 52.14 using 59 PHA bins.
# Reduced chi-squared = 0.9148 for 57 degrees of freedom
# Null hypothesis probability = 6.575054e-01
Photon flux (15-150 keV) in 64 sec: 0.165120 ( -0.0268688 0.0268808 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.58118e-07 ( -1.50874e-07 1.56636e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62641 ( -0.940105 0.496174 )
Epeak [keV] : 9986.13 ( )
Norm@50keV : 1.26160E-03 ( -0.000241028 0.00341936 )
------------------------------------------------------------
# Chi-Squared = 52.16 using 59 PHA bins.
# Reduced chi-squared = 0.9314 for 56 degrees of freedom
# Null hypothesis probability = 6.210721e-01
Photon flux (15-150 keV) in 64 sec: 0.165057 ( -0.02686 0.026871 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.58022e-07 ( -1.50875e-07 1.56653e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.87505 ( -17.2634 -17.2634 )
beta : -1.68055 ( -0.491021 0.333515 )
Epeak [keV] : 21.2746 ( -21.2647 8.5212 )
Norm@50keV : 331.884 ( -333.685 260.538 )
------------------------------------------------------------
# Chi-Squared = 51.88 using 59 PHA bins.
# Reduced chi-squared = 0.9433 for 55 degrees of freedom
# Null hypothesis probability = 5.946170e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Tue Nov 3 04:05:28 EST 2009