batgrbproduct Analysis for Trigger=373681
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): Sat Oct 24 18:39:23 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger373681/GCN5_download_cron
======================================================================
Trigger: 00373681 Segment: 000
BAT Trigger Time: 278077672 [s; MET]
Trigger Stop: 278077736 [s; MET]
UTC: 2009-10-24T11:47:46.801000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 300.900198767234 Dec: 35.111627000385 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.25
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.25
Flight Position: [ source = BAT ]
RA: 300.900198767234 Dec: 35.111627000385 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 300.907974329578 Dec: 35.0983652601028 [deg; J2000]
{ 20h 03m 37.9s , +35d 05' 54.1" }
+/- 3.79584447378878 [arcmin] (estimated 90% radius based on SNR)
+/- 1.91736021037036 [arcmin] (formal 1-sigma fit error)
SNR: 4.52412855725594
Angular difference between Flight and Ground position is 0.882507 arcmin
Partial Coding Fraction: 0.4960938 [ including projection effects ]
Duration
T90: 1.05599993467331 +/- 0.46180510299031
Measured from: 191.676000118256
to: 192.732000052929 [s; relative to TRIGTIME]
T50: 0.503999948501587 +/- 0.42934838709197
Measured from: 191.856000125408
to: 192.36000007391 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 191.64200001955
to: 192.64200001955 [s; relative to TRIGTIME]
Total Fluence
Measured from: 191.663999974728
to: 192.768000006676 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.023005 0.025133 0.034105 0.007272
0.007860 0.008144 0.007253 0.006359 [error]
Peak 0.020957 0.022625 0.029699 0.005169
0.007347 0.007568 0.006809 0.005888 [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 5.92e-09 1.32e-08 2.31e-08 9.46e-08 6.31e-08 1.37e-07 erg/cm2
Error 3.46e-09 4.47e-09 6.93e-09 7.23e-08 1.75e-08 7.43e-08 erg/cm2
Peak flux Power-law 2.09e-01 2.27e-01 1.75e-01 2.21e-01 6.94e-01 8.31e-01 ph/cm2/s
Error 1.16e-01 7.51e-02 5.87e-02 1.65e-01 2.05e-01 2.35e-01 ph/cm2/s
Fluence Cutoff-PL 5.91e-09 1.32e-08 2.31e-08 9.41e-08 6.31e-08 1.36e-07 erg/cm2
Error 3.46e-09 4.48e-09 6.94e-09 7.19e-08 1.75e-08 7.39e-08 erg/cm2
Peak flux Cutoff-PL 2.09e-01 2.27e-01 1.75e-01 2.19e-01 6.93e-01 8.30e-01 ph/cm2/s
Error 1.16e-01 7.52e-02 5.87e-02 1.65e-01 2.05e-01 2.34e-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 1.189 0.537 - - 5.62e-03 1.51e-03 76.020 57
CPL 1.201 0.542 9999.4 0.0 5.65e-03 8.07e-03 76.030 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.375 0.546 - - 5.73e-03 1.59e-03 69.380 57
CPL 3.157 0.000 324.9 0.0 7.73e-04 0.00e+00 69.200 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 1.104 191.664 192.768
T90 1.056 191.676 192.732
T50 0.504 191.856 192.360
Peak 1.000 191.642 192.642
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
300.9080 +35.0984 0.0428 40.2 -153.5 0.0678 4.5 TRIG_00373681
------------------------------------------
Foreground time interval of the image:
191.664 192.768 (delta_t = 1.104 [sec])
Background time interval of the image:
-68.399 -56.924 (delta_t = 11.476 [sec])
-56.000 8.090 (delta_t = 64.090 [sec])
9.000 191.664 (delta_t = 182.664 [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 191.664 sec. to 192.768 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18896 ( -0.551024 0.522652 )
Norm@50keV : 5.61561E-03 ( -0.00152649 0.00149096 )
------------------------------------------------------------
# Chi-Squared = 76.02 using 59 PHA bins.
# Reduced chi-squared = 1.334 for 57 degrees of freedom
# Null hypothesis probability = 4.690884e-02
Photon flux (15-150 keV) in 1.104 sec: 0.658152 ( -0.188614 0.190939 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.30956e-08 ( -1.75103e-08 1.75639e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 191.664 sec. to 192.768 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20075 ( -0.572286 0.511078 )
Epeak [keV] : 9999.36 ( -10000 -10000 )
Norm@50keV : 5.65070E-03 ( -0.00148912 0.014657 )
------------------------------------------------------------
# Chi-Squared = 76.03 using 59 PHA bins.
# Reduced chi-squared = 1.358 for 56 degrees of freedom
# Null hypothesis probability = 3.868923e-02
Photon flux (15-150 keV) in 1.104 sec: 0.657750 ( -0.188543 0.190888 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.31197e-08 ( -1.75214e-08 1.75734e-08 ) ergs/cm2
Band function
Time interval is from 191.664 sec. to 192.768 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.63227 ( 1.64499 2.63227 )
beta : -1.18893 ( -0.522725 0.550635 )
Epeak [keV] : 9999.03 ( -6880.5 -6880.5 )
Norm@50keV : 0.763244 ( -0.207548 0.202653 )
------------------------------------------------------------
# Chi-Squared = 76.02 using 59 PHA bins.
# Reduced chi-squared = 1.382 for 55 degrees of freedom
# Null hypothesis probability = 3.173761e-02
Photon flux (15-150 keV) in 1.104 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 191.664 sec. to 192.620 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37506 ( -0.545483 0.545712 )
Norm@50keV : 5.72702E-03 ( -0.00159626 0.00159365 )
------------------------------------------------------------
# Chi-Squared = 69.38 using 59 PHA bins.
# Reduced chi-squared = 1.217 for 57 degrees of freedom
# Null hypothesis probability = 1.257932e-01
Photon flux (15-150 keV) in 0.956 sec: 0.693594 ( -0.204271 0.205616 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.31807e-08 ( -1.60886e-08 1.62201e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 191.664 sec. to 192.620 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.15727 ( )
Epeak [keV] : 324.929 ( )
Norm@50keV : 7.72684E-04 ( )
------------------------------------------------------------
# Chi-Squared = 69.20 using 59 PHA bins.
# Reduced chi-squared = 1.236 for 56 degrees of freedom
# Null hypothesis probability = 1.107711e-01
Photon flux (15-150 keV) in 0.956 sec: 0.693267 ( -0.204205 0.205564 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.31962e-08 ( -1.60966e-08 1.6229e-08 ) ergs/cm2
Band function
Time interval is from 191.664 sec. to 192.620 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -4.71822 ( 3.28998 3.40588 )
beta : -1.37502 ( -0.544896 0.545421 )
Epeak [keV] : 435.299 ( -435.299 -435.299 )
Norm@50keV : 0.778382 ( -0.216827 0.216223 )
------------------------------------------------------------
# Chi-Squared = 69.38 using 59 PHA bins.
# Reduced chi-squared = 1.262 for 55 degrees of freedom
# Null hypothesis probability = 9.181713e-02
Photon flux (15-150 keV) in 0.956 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sat Oct 24 18:51:14 EDT 2009