batgrbproduct Analysis for Trigger=294385
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 20:16:23 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger294385/GCN5_download_cron
======================================================================
Trigger: 00294385 Segment: 000
BAT Trigger Time: 214200872 [s; MET]
Trigger Stop: 214201192 [s; MET]
UTC: 2007-10-16T04:14:29.705420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 274.713391197915 Dec: -17.0360475314541 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.94
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.94
Flight Position: [ source = BAT ]
RA: 274.713391197915 Dec: -17.0360475314541 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 274.893749322764 Dec: -16.813026603235 [deg; J2000]
{ 18h 19m 34.5s , -16d 48' 46.9" }
+/- 5.02621302439242 [arcmin] (estimated 90% radius based on SNR)
+/- 0 [arcmin] (formal 1-sigma fit error)
SNR: 3.02932366982758
RA = 18h 19m 34.5s (274.893749 deg.)
Dec = -16d 48' 47" (-16.813027 deg.)
Angular difference between Flight and Ground position is 16.918577 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 269.180000007153 +/- 76.1535991355611
Measured from: 308.287999987602
to: 577.467999994755 [s; relative to TRIGTIME]
T50: 179.004000008106 +/- 123.829207299057
Measured from: 357.796000003815
to: 536.800000011921 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 579.680000007153
to: 580.680000007153 [s; relative to TRIGTIME]
Total Fluence
Measured from: 256.268000006676
to: 580.680000007153 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.648481 0.658259 0.248243 0.050968
0.100882 0.096446 0.085074 0.077413 [error]
Peak 0.009511 0.028452 0.022299 0.003867
0.009858 0.009524 0.008927 0.008064 [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 2.20e-07 2.57e-07 2.16e-07 3.08e-07 8.03e-07 1.00e-06 erg/cm2
Error 5.26e-08 4.76e-08 8.20e-08 2.33e-07 1.80e-07 3.29e-07 erg/cm2
Peak flux Power-law 1.71e-01 1.70e-01 1.18e-01 1.30e-01 5.11e-01 5.89e-01 ph/cm2/s
Error 1.17e-01 7.84e-02 6.83e-02 1.66e-01 2.29e-01 2.72e-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 9.96e-07 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 1.01e-01 1.91e-01 1.58e-01 3.09e-02 4.59e-01 4.80e-01 ph/cm2/s
Error 9.72e-02 5.71e-02 7.68e-02 1.54e-01 2.08e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.247 0.404 - - 2.63e-04 7.11e-05 76.935 57
CPL 1.528 0.000 27.8 0.0 6.57e-04 0.00e+00 77.986 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.525 0.774 - - 4.06e-03 1.93e-03 60.888 57
CPL -0.964 0.000 66.1 0.0 5.51e-02 0.00e+00 59.164 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 324.412 256.268 580.680
T90 269.180 308.288 577.468
T50 179.004 357.796 536.800
Peak 1.000 579.680 580.680
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
274.8937 -16.8130 0.0000 19.7 -28.7 0.5641 3.0 TRIG_00294385
------------------------------------------
Foreground time interval of the image:
256.268 265.380 (delta_t = 9.112 [sec])
266.000 443.440 (delta_t = 177.440 [sec])
445.000 508.201 (delta_t = 63.201 [sec])
Background time interval of the image:
-239.000 -85.670 (delta_t = 153.330 [sec])
-85.000 256.268 (delta_t = 341.268 [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
Multiple GTIs in the spectrum
tstart tstop
256.268000 265.380000
266.000000 443.440000
445.000000 580.680000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.24667 ( -0.373285 0.434511 )
Norm@50keV : 2.633725E-04 ( -7.310000E-05 6.905562E-05) )
------------------------------------------------------------
Chi-Squared = 76.93494 using 59 PHA bins.
Reduced chi-squared = 1.349736 for 57 degrees of freedom
Null hypothesis probability = 4.040E-02
Photon flux (15-150 keV) in 322.2 sec: 4.470469E-02 ( -0.00765905 0.00765945 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.03399e-07 ( -1.74987e-07 1.84717e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
256.268000 265.380000
266.000000 443.440000
445.000000 580.680000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52841 ( )
Epeak [keV] : 27.7935 ( )
Norm@50keV : 6.572563E-04 ( )
------------------------------------------------------------
Chi-Squared = 77.98599 using 59 PHA bins.
Reduced chi-squared = 1.392607 for 56 degrees of freedom
Null hypothesis probability = 2.769E-02
Photon flux (15-150 keV) in 322.2 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
256.268000 265.380000
266.000000 443.440000
445.000000 580.680000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.54375 ( -6.74130 2.98324 )
beta : -8.84430 ( -0.434178 0.373528 )
Epeak [keV] : 27.3485 ( -27.2485 9972.65 )
Norm@50keV : 6.598522E-04 ( -9.938065E-03 9.388134E-03) )
------------------------------------------------------------
Chi-Squared = 77.91468 using 59 PHA bins.
Reduced chi-squared = 1.416631 for 55 degrees of freedom
Null hypothesis probability = 2.272E-02
Photon flux (15-150 keV) in 322.2 sec: 4.468681E-02 ( -0.00765613 0.00765484 ) 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 579.680 sec. to 580.680 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52542 ( -0.725974 0.822830 )
Norm@50keV : 4.059827E-03 ( -1.956855E-03 1.896191E-03) )
------------------------------------------------------------
Chi-Squared = 60.88760 using 59 PHA bins.
Reduced chi-squared = 1.068203 for 57 degrees of freedom
Null hypothesis probability = 0.338
Photon flux (15-150 keV) in 1.000 sec: 0.510522 ( -0.228159 0.229712 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.84258e-08 ( -1.90193e-08 2.01682e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 579.680 sec. to 580.680 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.964018 ( )
Epeak [keV] : 66.0732 ( )
Norm@50keV : 5.507257E-02 ( )
------------------------------------------------------------
Chi-Squared = 59.16428 using 59 PHA bins.
Reduced chi-squared = 1.056505 for 56 degrees of freedom
Null hypothesis probability = 0.361
Photon flux (15-150 keV) in 1.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 579.680 sec. to 580.680 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.13561 ( -11.1356 3.86439 )
beta : -8.83388 ( -1.16612 7.73283 )
Epeak [keV] : 66.3917 ( -13.5475 9933.61 )
Norm@50keV : 6.325517E-02 ( -6.325517E-02 4.64906 )
------------------------------------------------------------
Chi-Squared = 59.15777 using 59 PHA bins.
Reduced chi-squared = 1.075596 for 55 degrees of freedom
Null hypothesis probability = 0.326
Photon flux (15-150 keV) in 1.000 sec: 0.458665 ( -0.109965 0.197121 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.59386e-08 ( -1.51231e-08 1.55303e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 20:34:55 EST 2007