batgrbproduct Analysis for Trigger=293924
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 19:44:09 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger293924/GCN5_download_cron
======================================================================
Trigger: 00293924 Segment: 000
BAT Trigger Time: 213799216.128 [s; MET]
Trigger Stop: 213799217.152 [s; MET]
UTC: 2007-10-11T12:40:13.844040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 8.40009894747049 Dec: 61.0725216897883 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.99
Image Trigger?: NO
Rate S/N Ratio: 16.0934769394311 [ if not an image trigger ]
Image S/N Ratio: 7.99
Flight Position: [ source = BAT ]
RA: 8.40009894747049 Dec: 61.0725216897883 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 8.39311259630894 Dec: 61.1292294643689 [deg; J2000]
{ 00h 33m 34.3s , +61d 07' 45.2" }
+/- 1.33501961516376 [arcmin] (estimated 90% radius based on SNR)
+/- 0.527442746103215 [arcmin] (formal 1-sigma fit error)
SNR: 20.1303030601475
RA = 0h 33m 34.3s (8.393113 deg.)
Dec = 61d 7' 45" (61.129229 deg.)
Angular difference between Flight and Ground position is 3.408492 arcmin
Partial Coding Fraction: 0.3710938 [ including projection effects ]
Duration
T90: 65.5640000104904 +/- 18.1911514722849
Measured from: -4.11199998855591
to: 61.4520000219345 [s; relative to TRIGTIME]
T50: 42.8240000009537 +/- 3.17215194613672
Measured from: 4.88400000333786
to: 47.7080000042915 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 45.9760000109673
to: 46.9760000109673 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.47200000286102
to: 93.6200000047684 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.086169 1.211451 1.053594 0.377885
0.083410 0.084920 0.076011 0.066386 [error]
Peak 0.057034 0.057322 0.079425 0.016261
0.009113 0.009771 0.009274 0.007595 [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 3.14e-07 5.87e-07 8.48e-07 2.60e-06 2.41e-06 4.33e-06 erg/cm2
Error 4.33e-08 4.68e-08 7.66e-08 5.37e-07 1.85e-07 5.81e-07 erg/cm2
Peak flux Power-law 4.88e-01 5.53e-01 4.50e-01 6.10e-01 1.71e+00 2.10e+00 ph/cm2/s
Error 1.37e-01 9.22e-02 7.54e-02 2.25e-01 2.52e-01 3.05e-01 ph/cm2/s
Fluence Cutoff-PL 3.13e-07 5.88e-07 8.49e-07 2.58e-06 2.41e-06 4.36e-06 erg/cm2
Error 4.33e-08 4.68e-08 7.67e-08 5.33e-07 1.86e-07 5.79e-07 erg/cm2
Peak flux Cutoff-PL 4.87e-01 5.53e-01 4.50e-01 6.06e-01 1.71e+00 2.10e+00 ph/cm2/s
Error 1.37e-01 9.23e-02 7.55e-02 2.24e-01 2.52e-01 3.04e-01 ph/cm2/s
Fluence Band 3.23e-07 3.03e-05 4.19e-06 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 2.96e-07 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.87e-01 5.53e-01 4.50e-01 6.06e-01 1.71e+00 2.10e+00 ph/cm2/s
Error 1.37e-01 9.23e-02 6.14e-02 2.74e-01 2.52e-01 3.05e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.469 0.135 - - 2.45e-03 1.74e-04 66.055 57
CPL 1.466 0.135 9992.1 5000.0 2.46e-03 1.75e-04 66.077 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.299 0.263 - - 1.44e-02 2.02e-03 60.522 57
CPL 1.295 0.265 9999.2 5000.0 1.44e-02 2.03e-03 60.526 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: 54.400000 sec.
T50 in the 50-300 keV band: 41.216000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 103.092 -9.472 93.620
T90 65.564 -4.112 61.452
T50 42.824 4.884 47.708
Peak 1.000 45.976 46.976
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
8.3931 +61.1292 0.0096 36.5 145.7 4.0967 20.1 TRIG_00293924
------------------------------------------
Foreground time interval of the image:
-9.472 93.620 (delta_t = 103.092 [sec])
Background time interval of the image:
-239.128 -9.472 (delta_t = 229.656 [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 -9.472 sec. to 93.620 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46918 ( -0.134715 0.134450 )
Norm@50keV : 2.452031E-03 ( -1.740823E-04 1.738293E-04) )
------------------------------------------------------------
Chi-Squared = 66.05489 using 59 PHA bins.
Reduced chi-squared = 1.158858 for 57 degrees of freedom
Null hypothesis probability = 0.193
Photon flux (15-150 keV) in 103.1 sec: 0.303643 ( -0.022921 0.023061 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41082e-06 ( -1.85064e-07 1.85817e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.472 sec. to 93.620 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46641 ( -0.135583 0.135338 )
Epeak [keV] : 9992.12 ( -9992.11 7.87695 )
Norm@50keV : 2.456123E-03 ( -1.710975E-04 1.783951E-04) )
------------------------------------------------------------
Chi-Squared = 66.07748 using 59 PHA bins.
Reduced chi-squared = 1.179955 for 56 degrees of freedom
Null hypothesis probability = 0.168
Photon flux (15-150 keV) in 103.1 sec: 0.303516 ( -0.022912 0.023052 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41109e-06 ( -1.85003e-07 1.86281e-07 ) ergs/cm2
Band function
Time interval is from -9.472 sec. to 93.620 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10120 ( -8.81880 3.93986 )
beta : -1.46826 ( -8.53144 0.134199 )
Epeak [keV] : 48.7378 ( -48.5611 3546.13 )
Norm@50keV : 4.968845E-03 ( -2.173098E-03 0.352396 )
------------------------------------------------------------
Chi-Squared = 66.07036 using 59 PHA bins.
Reduced chi-squared = 1.201279 for 55 degrees of freedom
Null hypothesis probability = 0.146
Photon flux (15-150 keV) in 103.1 sec: 0.302448 ( -0.021822 0.021541 ) 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 45.976 sec. to 46.976 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29915 ( -0.264070 0.262785 )
Norm@50keV : 1.436646E-02 ( -2.018198E-03 2.017277E-03) )
------------------------------------------------------------
Chi-Squared = 60.52238 using 59 PHA bins.
Reduced chi-squared = 1.061796 for 57 degrees of freedom
Null hypothesis probability = 0.350
Photon flux (15-150 keV) in 1.000 sec: 1.71368 ( -0.25154 0.25252 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41995e-07 ( -2.2059e-08 2.2245e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 45.976 sec. to 46.976 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29484 ( -0.265765 0.264744 )
Epeak [keV] : 9999.24 ( -9999.23 0.762695 )
Norm@50keV : 1.442658E-02 ( -2.026147E-03 2.027721E-03) )
------------------------------------------------------------
Chi-Squared = 60.52557 using 59 PHA bins.
Reduced chi-squared = 1.080814 for 56 degrees of freedom
Null hypothesis probability = 0.316
Photon flux (15-150 keV) in 1.000 sec: 1.71306 ( -0.25147 0.25243 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42082e-07 ( -2.2105e-08 2.2184e-08 ) ergs/cm2
Band function
Time interval is from 45.976 sec. to 46.976 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25450 ( -7.81979 1.79731 )
beta : -9.07504 ( -0.263057 0.263997 )
Epeak [keV] : 978.945 ( -978.845 9021.05 )
Norm@50keV : 1.503915E-02 ( -0.274273 0.274170 )
------------------------------------------------------------
Chi-Squared = 60.56337 using 59 PHA bins.
Reduced chi-squared = 1.101152 for 55 degrees of freedom
Null hypothesis probability = 0.282
Photon flux (15-150 keV) in 1.000 sec: 1.71301 ( -0.25142 0.25246 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42019e-07 ( -2.2152e-08 2.2118e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 19:57:56 EST 2007