batgrbproduct Analysis for Trigger=217704
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): Tue Jan 1 19:25:39 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger217704/GCN5_download_cron
======================================================================
Trigger: 00217704 Segment: 000
BAT Trigger Time: 174000620.8 [s; MET]
Trigger Stop: 174000624.896 [s; MET]
UTC: 2006-07-07T21:30:19.497320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 357.079370004711 Dec: -17.9229403218212 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.58
Image Trigger?: NO
Rate S/N Ratio: 11.4455231422596 [ if not an image trigger ]
Image S/N Ratio: 8.58
Flight Position: [ source = BAT ]
RA: 357.079370004711 Dec: -17.9229403218212 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 357.071893583694 Dec: -17.9069667828815 [deg; J2000]
{ 23h 48m 17.3s , -17d 54' 25.1" }
+/- 1.45248245923649 [arcmin] (estimated 90% radius based on SNR)
+/- 0.515079549225772 [arcmin] (formal 1-sigma fit error)
SNR: 17.8456094874822
RA = 23h 48m 17.3s (357.071894 deg.)
Dec = -17d 54' 25" (-17.906967 deg.)
Angular difference between Flight and Ground position is 1.049163 arcmin
Partial Coding Fraction: 0.4335938 [ including projection effects ]
Duration
T90: 60.5240000188351 +/- 6.31420049148106
Measured from: -42.744000017643
to: 17.7800000011921 [s; relative to TRIGTIME]
T50: 34.6960000097752 +/- 14.8396878719943
Measured from: -24.9040000140667
to: 9.79199999570847 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.00799998641014
to: 3.00799998641014 [s; relative to TRIGTIME]
Total Fluence
Measured from: -48.9560000002384
to: 25.4439999759197 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.654476 1.116228 0.712545 0.129703
0.067443 0.068165 0.059551 0.050109 [error]
Peak 0.032221 0.039525 0.043059 0.006375
0.008318 0.008494 0.007640 0.006048 [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 2.84e-07 4.60e-07 5.64e-07 1.36e-06 1.70e-06 2.68e-06 erg/cm2
Error 3.61e-08 3.69e-08 5.74e-08 2.88e-07 1.40e-07 3.36e-07 erg/cm2
Peak flux Power-law 3.50e-01 3.37e-01 2.26e-01 2.37e-01 1.01e+00 1.15e+00 ph/cm2/s
Error 1.31e-01 8.00e-02 6.05e-02 1.28e-01 2.30e-01 2.50e-01 ph/cm2/s
Fluence Cutoff-PL 2.37e-07 5.11e-07 6.02e-07 4.03e-07 1.60e-06 1.74e-06 erg/cm2
Error 4.36e-08 4.78e-08 6.78e-08 2.67e-07 1.51e-07 2.98e-07 erg/cm2
Peak flux Cutoff-PL 3.04e-01 3.58e-01 2.45e-01 1.27e-01 9.85e-01 1.03e+00 ph/cm2/s
Error 1.60e-01 9.48e-02 7.45e-02 1.81e-01 2.34e-01 3.01e-01 ph/cm2/s
Fluence Band 2.36e-07 5.09e-07 5.99e-07 5.03e-07 1.60e-06 1.83e-06 erg/cm2
Error 4.25e-08 4.78e-08 7.35e-08 4.02e-07 1.50e-07 4.73e-07 erg/cm2
Peak flux Band 3.04e-01 3.58e-01 2.45e-01 1.27e-01 9.85e-01 1.03e+00 ph/cm2/s
Error 1.60e-01 9.49e-02 7.46e-02 1.81e-01 2.37e-01 3.01e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.706 0.130 - - 2.46e-03 1.95e-04 70.515 57
CPL 0.640 0.646 63.4 15.4 8.54e-03 7.25e-03 60.466 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.575 0.371 - - 7.91e-03 1.75e-03 75.565 57
CPL 0.866 1.501 84.2 5000.0 1.76e-02 7.06e-02 74.913 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: 23.808000 sec.
T50 in the 50-300 keV band: 13.120000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 74.400 -48.956 25.444
T90 60.524 -42.744 17.780
T50 34.696 -24.904 9.792
Peak 1.000 2.008 3.008
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
357.0719 -17.9070 0.0108 45.0 -165.4 2.6050 17.8 TRIG_00217704
------------------------------------------
Foreground time interval of the image:
-48.956 25.444 (delta_t = 74.400 [sec])
Background time interval of the image:
-239.800 -233.780 (delta_t = 6.020 [sec])
-232.800 -48.956 (delta_t = 183.844 [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 -48.956 sec. to 25.444 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70555 ( -0.129075 0.130777 )
Norm@50keV : 2.462485E-03 ( -1.958967E-04 1.949740E-04) )
------------------------------------------------------------
Chi-Squared = 70.51526 using 59 PHA bins.
Reduced chi-squared = 1.237110 for 57 degrees of freedom
Null hypothesis probability = 0.108
Photon flux (15-150 keV) in 74.40 sec: 0.327686 ( -0.02644 0.026515 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6954e-06 ( -1.39321e-07 1.40304e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -48.956 sec. to 25.444 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.640027 ( -0.690800 0.600982 )
Epeak [keV] : 63.3670 ( -9.48172 21.3755 )
Norm@50keV : 8.539438E-03 ( -4.238230E-03 1.026249E-02) )
------------------------------------------------------------
Chi-Squared = 60.46597 using 59 PHA bins.
Reduced chi-squared = 1.079749 for 56 degrees of freedom
Null hypothesis probability = 0.318
Photon flux (15-150 keV) in 74.40 sec: 0.313486 ( -0.027571 0.027627 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60115e-06 ( -1.50348e-07 1.50764e-07 ) ergs/cm2
Band function
Time interval is from -48.956 sec. to 25.444 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.641329 ( -0.599714 0.592855 )
beta : -9.31620 ( -0.683797 7.41280 )
Epeak [keV] : 63.3855 ( -9.51698 21.3493 )
Norm@50keV : 8.525078E-03 ( -4.225347E-03 1.028632E-02) )
------------------------------------------------------------
Chi-Squared = 60.46608 using 59 PHA bins.
Reduced chi-squared = 1.099383 for 55 degrees of freedom
Null hypothesis probability = 0.285
Photon flux (15-150 keV) in 74.40 sec: 0.313470 ( -0.026646 0.027505 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60064e-06 ( -1.51084e-07 1.48659e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.008 sec. to 3.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57453 ( -0.367073 0.374750 )
Norm@50keV : 7.914239E-03 ( -1.756590E-03 1.741444E-03) )
------------------------------------------------------------
Chi-Squared = 75.56472 using 59 PHA bins.
Reduced chi-squared = 1.325697 for 57 degrees of freedom
Null hypothesis probability = 5.047E-02
Photon flux (15-150 keV) in 1.000 sec: 1.00916 ( -0.229366 0.2307 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.42864e-08 ( -1.72966e-08 1.73914e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.008 sec. to 3.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.866412 ( -1.96957 1.03157 )
Epeak [keV] : 84.1604 ( -84.1504 9915.84 )
Norm@50keV : 1.756892E-02 ( -1.756892E-02 0.123701 )
------------------------------------------------------------
Chi-Squared = 74.91266 using 59 PHA bins.
Reduced chi-squared = 1.337726 for 56 degrees of freedom
Null hypothesis probability = 4.652E-02
Photon flux (15-150 keV) in 1.000 sec: 0.984571 ( -0.232547 0.235519 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.24418e-08 ( -1.80027e-08 1.79375e-08 ) ergs/cm2
Band function
Time interval is from 2.008 sec. to 3.008 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.976555 ( -0.922733 1.00024 )
beta : -8.97458 ( -1.201630E-04 1.02529 )
Epeak [keV] : 92.7684 ( -35.1168 9915.25 )
Norm@50keV : 1.527996E-02 ( -1.736418E-02 0.124318 )
------------------------------------------------------------
Chi-Squared = 74.93314 using 59 PHA bins.
Reduced chi-squared = 1.362421 for 55 degrees of freedom
Null hypothesis probability = 3.822E-02
Photon flux (15-150 keV) in 1.000 sec: 0.984729 ( -0.237247 0.236541 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.23107e-08 ( -1.7913e-08 1.80041e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 19:47:21 EST 2008