batgrbproduct Analysis for Trigger=351954
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 v2.44
Process Start Time (local time): Fri May 15 00:53:12 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger351954/GCN5_download_cron
======================================================================
Trigger: 00351954 Segment: 000
BAT Trigger Time: 263989410.368 [s; MET]
Trigger Stop: 263989411.392 [s; MET]
UTC: 2009-05-14T10:23:25.627720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 200.939802662773 Dec: -31.8126340809782 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.76
Image Trigger?: NO
Rate S/N Ratio: 14.7986485869487 [ if not an image trigger ]
Image S/N Ratio: 5.76
Flight Position: [ source = BAT ]
RA: 200.939802662773 Dec: -31.8126340809782 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 200.930756003011 Dec: -31.7670866997078 [deg; J2000]
{ 13h 23m 43.4s , -31d 46' 01.5" }
+/- 4.69868098007531 [arcmin] (estimated 90% radius based on SNR)
+/- 3.62497656695782 [arcmin] (formal 1-sigma fit error)
SNR: 3.33543685969396
Angular difference between Flight and Ground position is 2.771515 arcmin
Partial Coding Fraction: 0.796875 [ 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: 0
to: 1.02399998903275 [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 -0.008116 0.009867 0.018841 0.022465
0.008120 0.008194 0.007421 0.008520 [error]
Peak -0.008116 0.009867 0.018841 0.022465
0.008120 0.008194 0.007421 0.008520 [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 6.11e-10 3.11e-09 1.30e-08 2.12e-07 3.92e-08 2.38e-07 erg/cm2
Error 1.22e-09 3.49e-09 9.96e-09 4.25e-07 1.93e-08 3.95e-07 erg/cm2
Peak flux Power-law 1.91e-02 5.00e-02 1.05e-01 5.71e-01 2.84e-01 7.45e-01 ph/cm2/s
Error 3.78e-02 5.83e-02 8.16e-02 9.86e-01 2.26e-01 8.61e-01 ph/cm2/s
Fluence Cutoff-PL 5.99e-15 5.99e-15 5.99e-15 5.99e-15 5.99e-15 5.99e-15 erg/cm2
Error 5.12e+11 5.12e+11 5.12e+11 5.12e+11 5.12e+11 5.12e+11 erg/cm2
Peak flux Cutoff-PL 5.85e-03 5.85e-03 5.85e-03 5.85e-03 5.85e-03 5.85e-03 ph/cm2/s
Error 5.00e+23 5.00e+23 5.00e+23 5.00e+23 5.00e+23 5.00e+23 ph/cm2/s
Fluence Band 3.76e-10 2.85e-09 1.46e-08 8.09e-08 3.91e-08 1.24e-07 erg/cm2
Error 1.17e-09 3.33e-09 8.59e-09 4.05e-07 2.01e-08 7.83e-07 erg/cm2
Peak flux Band 5.81e-03 5.04e-02 1.23e-01 3.94e-01 2.78e-01 5.71e-01 ph/cm2/s
Error 2.71e-02 4.14e-02 9.79e-02 7.33e-01 2.17e-01 6.99e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.076 1.972 - - 2.04e-03 1.90e-03 41.456 57
CPL -0.092 1.969 9995.2 0.0 2.07e-03 0.00e+00 41.451 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.076 1.972 - - 2.04e-03 1.90e-03 41.456 57
CPL -0.092 1.969 9995.2 0.0 2.07e-03 0.00e+00 41.451 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
200.9308 -31.7671 0.0573 34.0 -165.0 0.0521 3.3 TRIG_00351954
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.368 -55.089 (delta_t = 5.279 [sec])
-54.368 -10.368 (delta_t = 44.000 [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: -7.560637E-02 ( -2.92439 1.02007 )
Norm@50keV : 2.044750E-03 ( -2.044750E-03 1.759845E-03) )
------------------------------------------------------------
Chi-Squared = 41.45604 using 59 PHA bins.
Reduced chi-squared = 0.7272989 for 57 degrees of freedom
Null hypothesis probability = 0.939
Photon flux (15-150 keV) in 1.024 sec: 0.283948 ( -0.283948 0.167949 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.91929e-08 ( -1.92902e-08 1.93176e-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: -9.239135E-02 ( -2.90761 1.03008 )
Epeak [keV] : 9995.23 ( )
Norm@50keV : 2.069223E-03 ( )
------------------------------------------------------------
Chi-Squared = 41.45058 using 59 PHA bins.
Reduced chi-squared = 0.7401890 for 56 degrees of freedom
Null hypothesis probability = 0.927
Photon flux (15-150 keV) in 1.024 sec: 5.851406E-03 ( -0.00585141 1e+24 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.99184e-15 ( -5.99184e-15 1.024e+12 ) 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 : -0.306135 ( -9.69386 5.30614 )
beta : 7.772837E-02 ( -10.0777 9.92227 )
Epeak [keV] : 25.1170 ( -146.660 9853.24 )
Norm@50keV : 2.849228E-03 ( -0.105135 0.778932 )
------------------------------------------------------------
Chi-Squared = 41.45605 using 59 PHA bins.
Reduced chi-squared = 0.7537464 for 55 degrees of freedom
Null hypothesis probability = 0.912
Photon flux (15-150 keV) in 1.024 sec: 0.277562 ( -0.277562 0.15628 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90519e-08 ( -2.05349e-08 1.96244e-08 ) 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: -7.560637E-02 ( -2.92439 1.02007 )
Norm@50keV : 2.044750E-03 ( -2.044750E-03 1.759845E-03) )
------------------------------------------------------------
Chi-Squared = 41.45604 using 59 PHA bins.
Reduced chi-squared = 0.7272989 for 57 degrees of freedom
Null hypothesis probability = 0.939
Photon flux (15-150 keV) in 1.024 sec: 0.283948 ( -0.283948 0.167949 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.91929e-08 ( -1.92902e-08 1.93176e-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: -9.239135E-02 ( -2.90761 1.03008 )
Epeak [keV] : 9995.23 ( )
Norm@50keV : 2.069223E-03 ( )
------------------------------------------------------------
Chi-Squared = 41.45058 using 59 PHA bins.
Reduced chi-squared = 0.7401890 for 56 degrees of freedom
Null hypothesis probability = 0.927
Photon flux (15-150 keV) in 1.024 sec: 5.851406E-03 ( -0.00585141 1e+24 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.99184e-15 ( -5.99184e-15 1.024e+12 ) 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 : -0.306135 ( -9.69386 5.30614 )
beta : 7.772837E-02 ( -10.0777 9.92227 )
Epeak [keV] : 25.1170 ( -146.660 9853.24 )
Norm@50keV : 2.849228E-03 ( -0.105135 0.778932 )
------------------------------------------------------------
Chi-Squared = 41.45605 using 59 PHA bins.
Reduced chi-squared = 0.7537464 for 55 degrees of freedom
Null hypothesis probability = 0.912
Photon flux (15-150 keV) in 1.024 sec: 0.277562 ( -0.277562 0.15628 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90519e-08 ( -2.05349e-08 1.96244e-08 ) ergs/cm2
Plot creation:
Fri May 15 01:03:12 EDT 2009