batgrbproduct Analysis for Trigger=296491
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 v2.41
Process Start Time (local time): Fri Dec 14 22:57:11 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger296491/GCN5_download_cron
======================================================================
Trigger: 00296491 Segment: 000
BAT Trigger Time: 216571901.632 [s; MET]
Trigger Stop: 216571902.656 [s; MET]
UTC: 2007-11-12T14:51:39.275140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 297.441990896559 Dec: -50.3379015898847 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.7
Image Trigger?: NO
Rate S/N Ratio: 14.0356688476182 [ if not an image trigger ]
Image S/N Ratio: 6.7
Flight Position: [ source = BAT ]
RA: 297.441990896559 Dec: -50.3379015898847 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 297.445785124918 Dec: -50.3464283933739 [deg; J2000]
{ 19h 49m 47.0s , -50d 20' 47.1" }
+/- 3.7095342099465 [arcmin] (estimated 90% radius based on SNR)
+/- 2.44198416250723 [arcmin] (formal 1-sigma fit error)
SNR: 4.67525151011665
RA = 19h 49m 47.0s (297.445785 deg.)
Dec = -50d 20' 47" (-50.346428 deg.)
Angular difference between Flight and Ground position is 0.531838 arcmin
Partial Coding Fraction: 0.3945312 [ 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 0.041362 0.031242 -0.004631 0.005836
0.010002 0.009495 0.008458 0.008916 [error]
Peak 0.041362 0.031242 -0.004631 0.005836
0.010002 0.009495 0.008458 0.008916 [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 1.73e-08 1.15e-08 5.03e-09 2.99e-09 3.53e-08 3.69e-08 erg/cm2
Error 6.06e-09 5.53e-09 5.50e-09 5.99e-09 1.43e-08 1.70e-08 erg/cm2
Peak flux Power-law 5.65e-01 2.12e-01 4.62e-02 1.20e-02 8.31e-01 8.35e-01 ph/cm2/s
Error 2.02e-01 9.76e-02 4.34e-02 2.27e-02 2.71e-01 2.74e-01 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 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
Fluence Band 1.64e-08 1.39e-08 2.94e-09 1.01e-10 3.36e-08 3.50e-08 erg/cm2
Error 6.61e-09 4.42e-09 3.85e-09 4.59e-09 1.11e-08 0.00e+00 erg/cm2
Peak flux Band 4.89e-01 2.74e-01 1.33e-02 5.09e-05 7.76e-01 7.76e-01 ph/cm2/s
Error 2.70e-01 1.45e-01 4.87e-02 1.47e-02 2.51e-01 2.51e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.201 0.913 - - 2.60e-03 2.34e-03 63.082 57
CPL 1.083 0.000 14.0 0.0 6.86e-02 0.00e+00 62.000 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.201 0.913 - - 2.60e-03 2.34e-03 63.082 57
CPL 1.083 0.000 14.0 0.0 6.86e-02 0.00e+00 62.000 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
297.4458 -50.3464 0.0412 47.1 -168.9 0.0896 4.7 TRIG_00296491
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-30.731 -5.632 (delta_t = 25.099 [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.
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: 3.20082 ( -0.738074 1.08858 )
Norm@50keV : 2.598771E-03 ( -2.598771E-03 2.085355E-03) )
------------------------------------------------------------
Chi-Squared = 63.08225 using 59 PHA bins.
Reduced chi-squared = 1.106706 for 57 degrees of freedom
Null hypothesis probability = 0.270
Photon flux (15-150 keV) in 1.024 sec: 0.830793 ( -0.270887 0.271677 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.53049e-08 ( -1.34787e-08 1.51623e-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: 1.08322 ( )
Epeak [keV] : 13.9884 ( )
Norm@50keV : 6.861714E-02 ( )
------------------------------------------------------------
Chi-Squared = 61.99984 using 59 PHA bins.
Reduced chi-squared = 1.107140 for 56 degrees of freedom
Null hypothesis probability = 0.271
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : -1.64271 ( -8.35729 0.965816 )
beta : -8.39508 ( -1.60492 18.3951 )
Epeak [keV] : 9.42622 ( -9.40612 48.5859 )
Norm@50keV : 2.233886E-02 ( -2.952422E-02 671708. )
------------------------------------------------------------
Chi-Squared = 62.39657 using 59 PHA bins.
Reduced chi-squared = 1.134483 for 55 degrees of freedom
Null hypothesis probability = 0.230
Photon flux (15-150 keV) in 1.024 sec: 0.776377 ( -0.250865 0.250983 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.3614e-08 ( -1.1588e-08 1.06692e-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: 3.20082 ( -0.738074 1.08858 )
Norm@50keV : 2.598771E-03 ( -2.598771E-03 2.085355E-03) )
------------------------------------------------------------
Chi-Squared = 63.08225 using 59 PHA bins.
Reduced chi-squared = 1.106706 for 57 degrees of freedom
Null hypothesis probability = 0.270
Photon flux (15-150 keV) in 1.024 sec: 0.830793 ( -0.270887 0.271677 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.53049e-08 ( -1.34787e-08 1.51623e-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: 1.08322 ( )
Epeak [keV] : 13.9884 ( )
Norm@50keV : 6.861714E-02 ( )
------------------------------------------------------------
Chi-Squared = 61.99984 using 59 PHA bins.
Reduced chi-squared = 1.107140 for 56 degrees of freedom
Null hypothesis probability = 0.271
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : -1.64271 ( -8.35729 0.965816 )
beta : -8.39508 ( -1.60492 18.3951 )
Epeak [keV] : 9.42622 ( -9.40612 48.5859 )
Norm@50keV : 2.233886E-02 ( -2.952422E-02 671708. )
------------------------------------------------------------
Chi-Squared = 62.39657 using 59 PHA bins.
Reduced chi-squared = 1.134483 for 55 degrees of freedom
Null hypothesis probability = 0.230
Photon flux (15-150 keV) in 1.024 sec: 0.776377 ( -0.250865 0.250983 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.3614e-08 ( -1.1588e-08 1.06692e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 23:22:05 EST 2007