batgrbproduct Analysis for Trigger=202662
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): Mon Dec 31 16:01:57 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger202662/GCN5_download_cron
======================================================================
Trigger: 00202662 Segment: 000
BAT Trigger Time: 164940784 [s; MET]
Trigger Stop: 164941104 [s; MET]
UTC: 2006-03-25T00:53:02.908740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 266.726995738122 Dec: -28.9496736945432 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.66
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.66
Flight Position: [ source = BAT ]
RA: 266.726995738122 Dec: -28.9496736945432 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 266.639599390127 Dec: -28.8926300404056 [deg; J2000]
{ 17h 46m 33.5s , -28d 53' 33.5" }
+/- 3.55949418214511 [arcmin] (estimated 90% radius based on SNR)
+/- 2.69937128104936 [arcmin] (formal 1-sigma fit error)
SNR: 4.95930509184683
RA = 17h 46m 33.5s (266.639599 deg.)
Dec = -28d 53' 33" (-28.892630 deg.)
Angular difference between Flight and Ground position is 5.725440 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.139855 0.109421 0.051392 -0.020927
0.033243 0.030113 0.025436 0.022010 [error]
Peak 0.139855 0.109421 0.051392 -0.020927
0.033243 0.030113 0.025436 0.022010 [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 3.96e-08 4.48e-08 3.64e-08 4.93e-08 1.39e-07 1.70e-07 erg/cm2
Error 1.51e-08 1.45e-08 2.37e-08 6.87e-08 5.31e-08 9.80e-08 erg/cm2
Peak flux Power-law 3.92e-02 2.47e-02 1.00e-02 5.51e-03 7.68e-02 7.95e-02 ph/cm2/s
Error 1.53e-02 7.73e-03 6.31e-03 7.67e-03 2.18e-02 2.30e-02 ph/cm2/s
Fluence Cutoff-PL 3.96e-08 4.48e-08 3.63e-08 4.88e-08 1.39e-07 1.69e-07 erg/cm2
Error 1.51e-08 1.45e-08 2.38e-08 6.79e-08 5.31e-08 9.74e-08 erg/cm2
Peak flux Cutoff-PL 3.92e-02 2.47e-02 1.00e-02 5.47e-03 7.68e-02 7.94e-02 ph/cm2/s
Error 1.53e-02 7.73e-03 6.32e-03 7.61e-03 2.18e-02 2.30e-02 ph/cm2/s
Fluence Band 3.79e-08 4.52e-08 3.86e-08 5.58e-08 1.42e-07 1.79e-07 erg/cm2
Error 1.16e-08 1.33e-08 1.69e-08 7.31e-08 5.22e-08 5.61e-08 erg/cm2
Peak flux Band 3.92e-02 2.47e-02 1.00e-02 5.47e-03 7.68e-02 7.94e-02 ph/cm2/s
Error 1.53e-02 7.73e-03 4.62e-03 7.61e-03 2.18e-02 2.30e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.301 0.711 - - 4.39e-04 2.07e-04 61.681 57
CPL 1.995 0.251 1.0 0.0 6.04e-04 0.00e+00 62.038 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.301 0.711 - - 4.39e-04 2.07e-04 61.681 57
CPL 1.995 0.251 1.0 0.0 6.04e-04 0.00e+00 62.038 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
266.6396 -28.8926 0.0387 10.1 134.3 0.2938 5.0 TRIG_00202662
------------------------------------------
Foreground time interval of the image:
0.000 33.041 (delta_t = 33.041 [sec])
Background time interval of the image:
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 0.000 sec. to 33.041 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.30055 ( -0.635244 0.787209 )
Norm@50keV : 4.393010E-04 ( -2.125526E-04 2.013524E-04) )
------------------------------------------------------------
Chi-Squared = 61.68105 using 59 PHA bins.
Reduced chi-squared = 1.082124 for 57 degrees of freedom
Null hypothesis probability = 0.312
Photon flux (15-150 keV) in 33.04 sec: 7.679824E-02 ( -0.0218256 0.0218283 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38723e-07 ( -5.02799e-08 5.59248e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.041 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99525 ( -0.496171 5.545735E-03) )
Epeak [keV] : 0.998923 ( )
Norm@50keV : 6.037832E-04 ( )
------------------------------------------------------------
Chi-Squared = 62.03805 using 59 PHA bins.
Reduced chi-squared = 1.107822 for 56 degrees of freedom
Null hypothesis probability = 0.270
Photon flux (15-150 keV) in 33.04 sec: 7.676542E-02 ( -0.021818 0.0218205 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38628e-07 ( -5.03044e-08 5.59688e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.041 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.89633 ( -7.30551 7.69449 )
beta : -9.28222 ( -0.787193 0.634723 )
Epeak [keV] : 11.9737 ( -11.8737 9988.03 )
Norm@50keV : 7.241902E-04 ( -2.889424E-02 2.738772E-02) )
------------------------------------------------------------
Chi-Squared = 62.18647 using 59 PHA bins.
Reduced chi-squared = 1.130663 for 55 degrees of freedom
Null hypothesis probability = 0.236
Photon flux (15-150 keV) in 33.04 sec: 7.676528E-02 ( -0.0218193 0.0218093 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41754e-07 ( -5.34964e-08 5.09758e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.041 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.30055 ( -0.635244 0.787209 )
Norm@50keV : 4.393010E-04 ( -2.125526E-04 2.013524E-04) )
------------------------------------------------------------
Chi-Squared = 61.68105 using 59 PHA bins.
Reduced chi-squared = 1.082124 for 57 degrees of freedom
Null hypothesis probability = 0.312
Photon flux (15-150 keV) in 33.04 sec: 7.679824E-02 ( -0.0218256 0.0218283 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38723e-07 ( -5.02799e-08 5.59248e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.041 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99525 ( -0.496171 5.545735E-03) )
Epeak [keV] : 0.998923 ( )
Norm@50keV : 6.037832E-04 ( )
------------------------------------------------------------
Chi-Squared = 62.03805 using 59 PHA bins.
Reduced chi-squared = 1.107822 for 56 degrees of freedom
Null hypothesis probability = 0.270
Photon flux (15-150 keV) in 33.04 sec: 7.676542E-02 ( -0.021818 0.0218205 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38628e-07 ( -5.03044e-08 5.59688e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.041 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.89633 ( -7.30551 7.69449 )
beta : -9.28222 ( -0.787193 0.634723 )
Epeak [keV] : 11.9737 ( -11.8737 9988.03 )
Norm@50keV : 7.241902E-04 ( -2.889424E-02 2.738772E-02) )
------------------------------------------------------------
Chi-Squared = 62.18647 using 59 PHA bins.
Reduced chi-squared = 1.130663 for 55 degrees of freedom
Null hypothesis probability = 0.236
Photon flux (15-150 keV) in 33.04 sec: 7.676528E-02 ( -0.0218193 0.0218093 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41754e-07 ( -5.34964e-08 5.09758e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 16:07:28 EST 2007