batgrbproduct Analysis for Trigger=358643
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): Thu Jul 30 05:03:00 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger358643/GCN5_download_cron
======================================================================
Trigger: 00358643 Segment: 000
BAT Trigger Time: 270568676.928 [s; MET]
Trigger Stop: 270568703.808 [s; MET]
UTC: 2009-07-29T13:57:51.975780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 272.153178088732 Dec: -42.5833420603318 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.64
Image Trigger?: NO
Rate S/N Ratio: 18.6010752377383 [ if not an image trigger ]
Image S/N Ratio: 5.64
Flight Position: [ source = BAT ]
RA: 272.153178088732 Dec: -42.5833420603318 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 272.06745668465 Dec: -42.4071259459605 [deg; J2000]
{ 18h 08m 16.2s , -42d 24' 25.7" }
+/- 8.86080282097813 [arcmin] (estimated 90% radius based on SNR)
+/- 7.25253645670744 [arcmin] (formal 1-sigma fit error)
SNR: 1.34767576783315
Angular difference between Flight and Ground position is 11.232509 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 26.8800000548363 +/-
Measured from: 0
to: 26.8800000548363 [s; relative to TRIGTIME]
T50: 26.8800000548363 +/-
Measured from: 0
to: 26.8800000548363 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 26.8800000548363 second)
Measured from: 2.98023223876953e-08
to: 26.8800000846386 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 26.8800000548363 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.210411 -0.022390 -0.000945 -0.030428
0.035816 0.029481 0.025474 0.024534 [error]
Peak 0.210411 -0.022390 -0.000945 -0.030428
0.035816 0.029481 0.025474 0.024534 [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 4.57e-08 1.73e-08 3.73e-09 9.54e-10 6.71e-08 6.85e-08 erg/cm2
Error 1.53e-08 1.17e-08 5.86e-09 3.25e-09 2.84e-08 2.94e-08 erg/cm2
Peak flux Power-law 5.81e-02 1.23e-02 1.35e-03 1.62e-04 7.19e-02 7.15e-02 ph/cm2/s
Error 1.95e-02 8.10e-03 2.06e-03 4.99e-04 2.53e-02 2.54e-02 ph/cm2/s
Fluence Cutoff-PL 4.57e-08 1.71e-08 3.69e-09 9.47e-10 6.71e-08 6.67e-08 erg/cm2
Error 1.53e-08 1.17e-08 5.85e-09 3.22e-09 2.84e-08 2.93e-08 erg/cm2
Peak flux Cutoff-PL 6.85e-02 1.09e-02 2.61e-05 3.40e-11 7.94e-02 7.94e-02 ph/cm2/s
Error 2.12e-02 7.85e-03 1.36e-04 6.31e-07 2.46e-02 2.46e-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 4.241 1.134 - - 9.39e-05 1.20e-04 64.040 57
CPL -4.986 0.000 16.7 3.0 2.75e+03 1.11e+03 58.310 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.241 1.134 - - 9.39e-05 1.20e-04 64.040 57
CPL -4.986 0.000 16.7 3.0 2.75e+03 1.11e+03 58.310 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 26.880 0.000 26.880
T90 26.880 0.000 26.880
T50 26.880 0.000 26.880
Peak 26.880 0.000 26.880
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
272.0675 -42.4071 0.1425 11.1 175.1 0.1285 1.3 TRIG_00358643
------------------------------------------
Foreground time interval of the image:
0.000 26.880 (delta_t = 26.880 [sec])
Background time interval of the image:
-60.928 -44.928 (delta_t = 16.000 [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 26.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.24086 ( -0.97755 1.29054 )
Norm@50keV : 9.39389E-05 ( -9.4268e-05 0.000145775 )
------------------------------------------------------------
# Chi-Squared = 64.04 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 57 degrees of freedom
# Null hypothesis probability = 2.433502e-01
Photon flux (15-150 keV) in 26.88 sec: 7.19114E-02 ( -0.0249119 0.0257551 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.71075e-08 ( -2.63548e-08 3.0358e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.98560 ( )
Epeak [keV] : 16.7122 ( -2.8614 3.05448 )
Norm@50keV : 2749.64 ( -1312.6 912.36 )
------------------------------------------------------------
# Chi-Squared = 58.31 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 56 degrees of freedom
# Null hypothesis probability = 3.902921e-01
Photon flux (15-150 keV) in 26.88 sec: 7.94114E-02 ( -0.0246055 0.0245866 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.7104e-08 ( -2.63876e-08 3.03553e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.90588 ( 1.64499 4.20103 )
beta : -4.24323 ( -1.30789 0.963124 )
Epeak [keV] : 25.1725 ( -25.1725 -25.1725 )
Norm@50keV : 1.27096E-02 ( -0.0130918 0.0195221 )
------------------------------------------------------------
# Chi-Squared = 64.04 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 55 degrees of freedom
# Null hypothesis probability = 1.890811e-01
Photon flux (15-150 keV) in 26.88 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 26.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.24086 ( -0.97755 1.29054 )
Norm@50keV : 9.39389E-05 ( -9.4268e-05 0.000145775 )
------------------------------------------------------------
# Chi-Squared = 64.04 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 57 degrees of freedom
# Null hypothesis probability = 2.433502e-01
Photon flux (15-150 keV) in 26.88 sec: 7.19114E-02 ( -0.0249119 0.0257551 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.71075e-08 ( -2.63548e-08 3.0358e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.98560 ( )
Epeak [keV] : 16.7122 ( -2.8614 3.05448 )
Norm@50keV : 2749.64 ( -1312.6 912.36 )
------------------------------------------------------------
# Chi-Squared = 58.31 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 56 degrees of freedom
# Null hypothesis probability = 3.902921e-01
Photon flux (15-150 keV) in 26.88 sec: 7.94114E-02 ( -0.0246055 0.0245866 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.7104e-08 ( -2.63876e-08 3.03553e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.90588 ( 1.64499 4.20103 )
beta : -4.24323 ( -1.30789 0.963124 )
Epeak [keV] : 25.1725 ( -25.1725 -25.1725 )
Norm@50keV : 1.27096E-02 ( -0.0130918 0.0195221 )
------------------------------------------------------------
# Chi-Squared = 64.04 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 55 degrees of freedom
# Null hypothesis probability = 1.890811e-01
Photon flux (15-150 keV) in 26.88 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Thu Jul 30 05:37:07 EDT 2009