batgrbproduct Analysis for Trigger=234849
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): Wed Jan 2 09:01:23 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger234849/GCN5_download_cron
======================================================================
Trigger: 00234849 Segment: 000
BAT Trigger Time: 183114121.984 [s; MET]
Trigger Stop: 183114123.008 [s; MET]
UTC: 2006-10-21T09:02:00.463860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 94.2686376783712 Dec: 9.15972729389693 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 15.81
Image Trigger?: NO
Rate S/N Ratio: 35.2703841770968 [ if not an image trigger ]
Image S/N Ratio: 15.81
Flight Position: [ source = BAT ]
RA: 94.2686376783712 Dec: 9.15972729389693 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 94.2790430630081 Dec: 9.15380421445101 [deg; J2000]
{ 06h 17m 07.0s , +09d 09' 13.7" }
+/- 1.3654925412903 [arcmin] (estimated 90% radius based on SNR)
+/- 0.55899238279957 [arcmin] (formal 1-sigma fit error)
SNR: 19.4916186255899
RA = 6h 17m 7.0s (94.279043 deg.)
Dec = 9d 9' 14" (9.153804 deg.)
Angular difference between Flight and Ground position is 0.711482 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 22 +/- 3
Measured from: -4.9839999973774
to: 17.0160000026226 [s; relative to TRIGTIME]
T50: 9 +/- 1
Measured from: 0.0160000026226044
to: 9.0160000026226 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.0160000026226
to: 7.0160000026226 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.9839999973774
to: 26.0160000026226 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.661742 0.251633 0.031437 -0.000978
0.034459 0.028433 0.023713 0.019974 [error]
Peak 0.159033 0.023676 0.003293 -0.005170
0.006968 0.005148 0.004183 0.003522 [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 8.88e-07 1.30e-07 8.61e-09 6.05e-10 1.03e-06 1.03e-06 erg/cm2
Error 8.08e-08 1.55e-08 2.51e-09 3.03e-10 8.26e-08 8.26e-08 erg/cm2
Peak flux Power-law 1.72e+00 2.53e-01 1.69e-02 1.21e-03 1.99e+00 1.99e+00 ph/cm2/s
Error 2.11e-01 5.20e-02 8.10e-03 1.26e-03 2.26e-01 2.26e-01 ph/cm2/s
Fluence Cutoff-PL 8.88e-07 1.30e-07 8.57e-09 5.79e-15 9.97e-07 1.03e-06 erg/cm2
Error 8.07e-08 1.54e-08 6.82e-08 8.25e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.78e+00 2.01e-01 4.16e-04 9.47e-10 1.98e+00 1.98e+00 ph/cm2/s
Error 2.32e-01 6.18e-02 2.64e-03 5.91e-06 2.34e-01 2.34e-01 ph/cm2/s
Fluence Band 8.57e-07 1.08e-07 9.32e-10 6.42e-12 1.00e-06 1.00e-06 erg/cm2
Error 1.27e-08 3.23e-10 1.46e-12 8.30e-08 7.46e-08 0.00e+00 erg/cm2
Peak flux Band 1.70e+00 2.60e-01 1.81e-02 5.83e-04 2.03e+00 1.97e+00 ph/cm2/s
Error 1.98e-01 5.05e-02 4.54e-03 2.25e-01 2.23e-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 5.918 0.270 - - 2.81e-04 6.68e-05 90.666 57
CPL -2.490 0.000 11.7 0.6 1.62e+03 1.61e+03 60.279 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.889 0.414 - - 1.43e-03 5.54e-04 58.057 57
CPL -0.106 2.454 9.2 0.0 1.57e+01 7.60e+02 51.314 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 32.000 -5.984 26.016
T90 22.000 -4.984 17.016
T50 9.000 0.016 9.016
Peak 1.000 6.016 7.016
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
94.2790 +9.1538 0.0099 20.6 5.1 2.8215 19.5 TRIG_00234849
------------------------------------------
Foreground time interval of the image:
-5.984 26.016 (delta_t = 32.000 [sec])
Background time interval of the image:
-10.984 -5.984 (delta_t = 5.000 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -5.984 sec. to 26.016 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.91817 ( -0.271726 0.268598 )
Norm@50keV : 2.807905E-04 ( -6.038813E-05 7.314069E-05) )
------------------------------------------------------------
Chi-Squared = 90.66592 using 59 PHA bins.
Reduced chi-squared = 1.590630 for 57 degrees of freedom
Null hypothesis probability = 3.025E-03
Photon flux (15-150 keV) in 32.00 sec: 1.06415 ( -0.092088 0.09258 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02727e-06 ( -8.25408e-08 8.26144e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.984 sec. to 26.016 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.48951 ( )
Epeak [keV] : 11.7061 ( -0.552529 0.609785 )
Norm@50keV : 1616.64 ( -1300.56 1929.30 )
------------------------------------------------------------
Chi-Squared = 60.27872 using 59 PHA bins.
Reduced chi-squared = 1.076406 for 56 degrees of freedom
Null hypothesis probability = 0.324
Photon flux (15-150 keV) in 32.00 sec: 1.06288 ( -0.091939 0.0924 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.96822e-07 ( -4.60448e-08 9.04032e-08 ) ergs/cm2
Band function
Time interval is from -5.984 sec. to 26.016 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.46423 ( -1.53577 2.80208 )
beta : -5.91610 ( -0.270260 0.269767 )
Epeak [keV] : 310.101 ( -310.001 9689.90 )
Norm@50keV : 3.822867E-02 ( -8.265231E-03 9.874966E-03) )
------------------------------------------------------------
Chi-Squared = 90.66577 using 59 PHA bins.
Reduced chi-squared = 1.648469 for 55 degrees of freedom
Null hypothesis probability = 1.751E-03
Photon flux (15-150 keV) in 32.00 sec: 1.04797 ( -0.15265 0.11364 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00056e-06 ( -7.22144e-08 9.36992e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 6.016 sec. to 7.016 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.88911 ( -0.388914 0.438996 )
Norm@50keV : 1.427743E-03 ( -4.974208E-04 6.105960E-04) )
------------------------------------------------------------
Chi-Squared = 58.05728 using 59 PHA bins.
Reduced chi-squared = 1.018549 for 57 degrees of freedom
Null hypothesis probability = 0.436
Photon flux (15-150 keV) in 1.000 sec: 1.98757 ( -0.226 0.22615 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.41568e-08 ( -7.302e-09 7.316e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.016 sec. to 7.016 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.105937 ( -2.89406 2.01470 )
Epeak [keV] : 9.18553 ( )
Norm@50keV : 15.6903 ( -173.881 1346.78 )
------------------------------------------------------------
Chi-Squared = 51.31358 using 59 PHA bins.
Reduced chi-squared = 0.9163140 for 56 degrees of freedom
Null hypothesis probability = 0.653
Photon flux (15-150 keV) in 1.000 sec: 1.97779 ( -0.23505 0.23342 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.41451e-08 ( -7.3103e-09 7.3061e-09 ) ergs/cm2
Band function
Time interval is from 6.016 sec. to 7.016 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.03579 ( -0.964212 7.63404 )
beta : -4.90049 ( -0.427173 0.400148 )
Epeak [keV] : 113.981 ( -113.881 9886.02 )
Norm@50keV : 0.192445 ( -6.597109E-02 8.454467E-02) )
------------------------------------------------------------
Chi-Squared = 58.05437 using 59 PHA bins.
Reduced chi-squared = 1.055534 for 55 degrees of freedom
Null hypothesis probability = 0.363
Photon flux (15-150 keV) in 1.000 sec: 2.02656 ( -0.22468 0.22468 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.26375e-08 ( -6.9422e-09 6.9421e-09 ) ergs/cm2
Plot creation:
Wed Jan 2 09:05:41 EST 2008