batgrbproduct Analysis for Trigger=217805
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 19:48:21 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger217805/GCN5_download_cron
======================================================================
Trigger: 00217805 Segment: 000
BAT Trigger Time: 174053760.32 [s; MET]
Trigger Stop: 174053760.832 [s; MET]
UTC: 2006-07-08T12:15:59.016060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 7.79827043596902 Dec: -33.7296918247416 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.22
Image Trigger?: NO
Rate S/N Ratio: 18.1383571472171 [ if not an image trigger ]
Image S/N Ratio: 8.22
Flight Position: [ source = BAT ]
RA: 7.79827043596902 Dec: -33.7296918247416 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 7.82391812799438 Dec: -33.7480010121752 [deg; J2000]
{ 00h 31m 17.7s , -33d 44' 52.8" }
+/- 0.998629502658923 [arcmin] (estimated 90% radius based on SNR)
+/- 0.323834823511292 [arcmin] (formal 1-sigma fit error)
SNR: 30.4767917913891
RA = 0h 31m 17.7s (7.823918 deg.)
Dec = -33d 44' 53" (-33.748001 deg.)
Angular difference between Flight and Ground position is 1.686536 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 10.1680000126362 +/- 3.60124423553101
Measured from: 0.15200001001358
to: 10.3200000226498 [s; relative to TRIGTIME]
T50: 3.38000002503395 +/- 0.503841238343873
Measured from: 1.34000000357628
to: 4.72000002861023 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.108000010252
to: 2.108000010252 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.259999990463257
to: 14.1759999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.269478 0.326383 0.213618 0.042590
0.017849 0.018110 0.015875 0.013289 [error]
Peak 0.054552 0.096940 0.071167 0.017275
0.005321 0.005833 0.005140 0.003811 [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 8.06e-08 1.33e-07 1.65e-07 4.09e-07 4.94e-07 7.89e-07 erg/cm2
Error 9.02e-09 8.97e-09 1.58e-08 8.35e-08 3.70e-08 9.63e-08 erg/cm2
Peak flux Power-law 5.84e-01 6.34e-01 4.90e-01 6.21e-01 1.94e+00 2.33e+00 ph/cm2/s
Error 7.44e-02 4.96e-02 4.19e-02 1.10e-01 1.40e-01 1.68e-01 ph/cm2/s
Fluence Cutoff-PL 7.50e-08 1.38e-07 1.69e-07 2.23e-07 4.78e-07 6.02e-07 erg/cm2
Error 1.08e-08 1.10e-08 1.71e-08 1.62e-07 4.11e-08 1.78e-07 erg/cm2
Peak flux Cutoff-PL 5.43e-01 6.60e-01 5.10e-01 3.99e-01 1.92e+00 2.11e+00 ph/cm2/s
Error 8.79e-02 5.94e-02 4.88e-02 1.91e-01 1.43e-01 2.51e-01 ph/cm2/s
Fluence Band 7.46e-08 1.38e-07 1.68e-07 2.24e-07 4.78e-07 6.17e-07 erg/cm2
Error 1.07e-08 1.10e-08 1.71e-08 1.90e-07 4.10e-08 1.67e-07 erg/cm2
Peak flux Band 5.20e-01 6.86e-01 4.91e-01 5.25e-01 1.91e+00 2.22e+00 ph/cm2/s
Error 1.20e-01 8.81e-02 4.52e-02 1.46e-01 1.47e-01 2.05e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.681 0.123 - - 3.69e-03 2.60e-04 62.301 57
CPL 1.204 0.497 81.7 4969.3 6.45e-03 3.72e-03 60.064 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.372 0.121 - - 1.60e-02 1.13e-03 59.527 57
CPL 0.969 0.496 131.0 4958.7 2.55e-02 1.55e-02 57.481 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: 8.000000 sec.
T50 in the 50-300 keV band: 2.368000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 14.436 -0.260 14.176
T90 10.168 0.152 10.320
T50 3.380 1.340 4.720
Peak 1.000 1.108 2.108
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
7.8239 -33.7480 0.0063 18.5 -12.1 0.8320 30.5 TRIG_00217805
------------------------------------------
Foreground time interval of the image:
-0.260 9.481 (delta_t = 9.741 [sec])
Background time interval of the image:
-239.320 -0.260 (delta_t = 239.060 [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 -0.260 sec. to 14.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68136 ( -0.122411 0.124283 )
Norm@50keV : 3.685836E-03 ( -2.609496E-04 2.585067E-04) )
------------------------------------------------------------
Chi-Squared = 62.30065 using 59 PHA bins.
Reduced chi-squared = 1.092994 for 57 degrees of freedom
Null hypothesis probability = 0.293
Photon flux (15-150 keV) in 14.44 sec: 0.486377 ( -0.03301 0.033064 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.93542e-07 ( -3.68437e-08 3.71613e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.260 sec. to 14.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20445 ( -0.466143 0.527591 )
Epeak [keV] : 81.7357 ( -20.4041 9918.26 )
Norm@50keV : 6.454323E-03 ( -2.872270E-03 4.568013E-03) )
------------------------------------------------------------
Chi-Squared = 60.06383 using 59 PHA bins.
Reduced chi-squared = 1.072568 for 56 degrees of freedom
Null hypothesis probability = 0.331
Photon flux (15-150 keV) in 14.44 sec: 0.476005 ( -0.035062 0.017475 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.78025e-07 ( -4.09027e-08 4.12666e-08 ) ergs/cm2
Band function
Time interval is from -0.260 sec. to 14.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22472 ( -0.505819 0.484016 )
beta : -8.79838 ( -1.20162 7.16720 )
Epeak [keV] : 83.1420 ( -21.7547 9916.86 )
Norm@50keV : 6.303485E-03 ( -2.719452E-03 4.694175E-03) )
------------------------------------------------------------
Chi-Squared = 60.04003 using 59 PHA bins.
Reduced chi-squared = 1.091637 for 55 degrees of freedom
Null hypothesis probability = 0.298
Photon flux (15-150 keV) in 14.44 sec: 0.476032 ( -0.035075 0.034977 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.77723e-07 ( -4.10096e-08 4.10544e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.108 sec. to 2.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37173 ( -0.121164 0.121000 )
Norm@50keV : 1.604264E-02 ( -1.133535E-03 1.131259E-03) )
------------------------------------------------------------
Chi-Squared = 59.52682 using 59 PHA bins.
Reduced chi-squared = 1.044330 for 57 degrees of freedom
Null hypothesis probability = 0.384
Photon flux (15-150 keV) in 1.000 sec: 1.94151 ( -0.13977 0.13996 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.55935e-07 ( -1.2156e-08 1.2233e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.108 sec. to 2.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.968811 ( -0.531591 0.461064 )
Epeak [keV] : 131.016 ( -48.3354 9868.98 )
Norm@50keV : 2.553529E-02 ( -1.000739E-02 2.093459E-02) )
------------------------------------------------------------
Chi-Squared = 57.48095 using 59 PHA bins.
Reduced chi-squared = 1.026446 for 56 degrees of freedom
Null hypothesis probability = 0.420
Photon flux (15-150 keV) in 1.000 sec: 1.91591 ( -0.14327 0.14305 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.52244e-07 ( -1.3459e-08 1.2978e-08 ) ergs/cm2
Band function
Time interval is from 1.108 sec. to 2.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.116263 ( -2.43193 4.26542 )
beta : -1.54952 ( -8.45048 0.198022 )
Epeak [keV] : 50.3598 ( -22.9212 121.734 )
Norm@50keV : 0.132442 ( -1.25383 189.870 )
------------------------------------------------------------
Chi-Squared = 54.97393 using 59 PHA bins.
Reduced chi-squared = 0.9995260 for 55 degrees of freedom
Null hypothesis probability = 0.476
Photon flux (15-150 keV) in 1.000 sec: 1.90872 ( -0.15372 0.14012 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51868e-07 ( -1.3181e-08 1.3348e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 20:04:07 EST 2008