batgrbproduct Analysis for Trigger=293707
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 19:02:33 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger293707/GCN5_download_cron
======================================================================
Trigger: 00293707 Segment: 000
BAT Trigger Time: 213680475.136 [s; MET]
Trigger Stop: 213680479.232 [s; MET]
UTC: 2007-10-10T03:41:12.855120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 288.100630766172 Dec: -32.3786069237812 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.17
Image Trigger?: NO
Rate S/N Ratio: 9.1104335791443 [ if not an image trigger ]
Image S/N Ratio: 7.17
Flight Position: [ source = BAT ]
RA: 288.100630766172 Dec: -32.3786069237812 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 288.039982859877 Dec: -32.3882563729894 [deg; J2000]
{ 19h 12m 09.6s , -32d 23' 17.7" }
+/- 2.53335679616107 [arcmin] (estimated 90% radius based on SNR)
+/- 0.997081328459292 [arcmin] (formal 1-sigma fit error)
SNR: 8.0613781618622
RA = 19h 12m 9.6s (288.039983 deg.)
Dec = -32d 23' 18" (-32.388256 deg.)
Angular difference between Flight and Ground position is 3.127032 arcmin
Partial Coding Fraction: 0.4296875 [ including projection effects ]
Duration
T90: 6.19600000977516 +/- 1.63951822461446
Measured from: -0.980000019073486
to: 5.21599999070168 [s; relative to TRIGTIME]
T50: 2.70800000429153 +/- 1.62721970953392
Measured from: 0.824000000953674
to: 3.53200000524521 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.803999990224838
to: 1.80399999022484 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.14399999380112
to: 5.90000000596046 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.130203 0.148020 0.063195 -0.011839
0.024152 0.023666 0.021041 0.018623 [error]
Peak 0.039425 0.025656 0.016726 0.005056
0.009169 0.009055 0.008080 0.007175 [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 5.52e-08 6.34e-08 5.24e-08 7.27e-08 1.97e-07 2.46e-07 erg/cm2
Error 1.37e-08 1.25e-08 1.86e-08 4.97e-08 4.42e-08 7.41e-08 erg/cm2
Peak flux Power-law 4.81e-01 2.78e-01 1.02e-01 4.94e-02 8.88e-01 9.11e-01 ph/cm2/s
Error 1.93e-01 9.28e-02 8.71e-02 6.98e-02 2.57e-01 2.65e-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 4.63e-08 7.58e-08 5.15e-08 1.18e-08 1.84e-07 1.85e-07 erg/cm2
Error 1.29e-08 1.30e-08 1.01e-08 3.43e-08 3.43e-08 8.56e-08 erg/cm2
Peak flux Band 4.81e-01 8.83e-01 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 2.62e-01 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 2.276 0.369 - - 2.94e-03 7.75e-04 78.932 57
CPL 0.687 0.000 35.6 0.0 2.32e-02 0.00e+00 75.746 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.448 0.797 - - 4.67e-03 2.41e-03 71.763 57
CPL 1.992 0.000 1.0 0.0 7.69e-03 0.00e+00 72.275 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 7.044 -1.144 5.900
T90 6.196 -0.980 5.216
T50 2.708 0.824 3.532
Peak 1.000 0.804 1.804
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
288.0400 -32.3883 0.0238 45.3 -167.6 0.3642 8.1 TRIG_00293707
------------------------------------------
Foreground time interval of the image:
-1.144 5.900 (delta_t = 7.044 [sec])
Background time interval of the image:
-239.136 -1.144 (delta_t = 237.992 [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 -1.144 sec. to 5.900 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.27613 ( -0.342611 0.395994 )
Norm@50keV : 2.941367E-03 ( -7.879869E-04 7.618254E-04) )
------------------------------------------------------------
Chi-Squared = 78.93166 using 59 PHA bins.
Reduced chi-squared = 1.384766 for 57 degrees of freedom
Null hypothesis probability = 2.884E-02
Photon flux (15-150 keV) in 7.044 sec: 0.507401 ( -0.096671 0.096729 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97243e-07 ( -4.34608e-08 4.48865e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.144 sec. to 5.900 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.686872 ( )
Epeak [keV] : 35.5683 ( )
Norm@50keV : 2.321964E-02 ( )
------------------------------------------------------------
Chi-Squared = 75.74598 using 59 PHA bins.
Reduced chi-squared = 1.352607 for 56 degrees of freedom
Null hypothesis probability = 4.056E-02
Photon flux (15-150 keV) in 7.044 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -1.144 sec. to 5.900 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.859474 ( -1.44170 2.24744 )
beta : -9.21121 ( -0.788795 6.86216 )
Epeak [keV] : 34.5180 ( -17.2090 14.9705 )
Norm@50keV : 1.874459E-02 ( -1.874459E-02 0.337096 )
------------------------------------------------------------
Chi-Squared = 75.77435 using 59 PHA bins.
Reduced chi-squared = 1.377715 for 55 degrees of freedom
Null hypothesis probability = 3.311E-02
Photon flux (15-150 keV) in 7.044 sec: 0.485342 ( -0.098747 0.096952 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.84195e-07 ( -3.425e-08 3.42726e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.804 sec. to 1.804 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.44786 ( -0.643005 0.951899 )
Norm@50keV : 4.665384E-03 ( -2.564643E-03 2.253736E-03) )
------------------------------------------------------------
Chi-Squared = 71.76306 using 59 PHA bins.
Reduced chi-squared = 1.259001 for 57 degrees of freedom
Null hypothesis probability = 9.014E-02
Photon flux (15-150 keV) in 1.000 sec: 0.888078 ( -0.256782 0.256782 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.60044e-08 ( -1.69653e-08 1.80115e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.804 sec. to 1.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99232 ( )
Epeak [keV] : 0.990491 ( )
Norm@50keV : 7.688593E-03 ( )
------------------------------------------------------------
Chi-Squared = 72.27480 using 59 PHA bins.
Reduced chi-squared = 1.290622 for 56 degrees of freedom
Null hypothesis probability = 7.057E-02
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 0.804 sec. to 1.804 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.63729 ( -7.96271 7.03729 )
beta : -2.26581 ( -0.952105 0.642835 )
Epeak [keV] : 2.71893 ( -0.656985 9999.24 )
Norm@50keV : 4.257118E-02 ( -0.310093 0.306333 )
------------------------------------------------------------
Chi-Squared = 71.94632 using 59 PHA bins.
Reduced chi-squared = 1.308115 for 55 degrees of freedom
Null hypothesis probability = 6.220E-02
Photon flux (15-150 keV) in 1.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Fri Dec 14 19:23:32 EST 2007