batgrbproduct Analysis for Trigger=284850
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 03:53:56 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger284850/GCN5_download_cron
======================================================================
Trigger: 00284850 Segment: 000
BAT Trigger Time: 206076032.704 [s; MET]
Trigger Stop: 206076033.216 [s; MET]
UTC: 2007-07-14T03:20:30.618220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 42.9432215418995 Dec: 30.235985840538 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.37
Image Trigger?: NO
Rate S/N Ratio: 24.454038521275 [ if not an image trigger ]
Image S/N Ratio: 12.37
Flight Position: [ source = BAT ]
RA: 42.9432215418995 Dec: 30.235985840538 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 42.9326817815162 Dec: 30.2411826052468 [deg; J2000]
{ 02h 51m 43.8s , +30d 14' 28.3" }
+/- 1.27676780491556 [arcmin] (estimated 90% radius based on SNR)
+/- 0.470265610723776 [arcmin] (formal 1-sigma fit error)
SNR: 21.4550691518548
RA = 2h 51m 43.8s (42.932682 deg.)
Dec = 30d 14' 28" (30.241183 deg.)
Angular difference between Flight and Ground position is 0.629056 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 3 +/- 1.4142135623731
Measured from: -0.703999996185303
to: 2.2960000038147 [s; relative to TRIGTIME]
T50: 1 +/- 1
Measured from: 0.296000003814697
to: 1.2960000038147 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.296000003814697
to: 1.2960000038147 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.703999996185303
to: 2.2960000038147 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.181351 0.122370 0.031566 0.033394
0.009901 0.009585 0.008437 0.008455 [error]
Peak 0.108571 0.079680 0.016843 0.015612
0.006335 0.005957 0.004997 0.004985 [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 5.30e-08 5.01e-08 3.28e-08 3.34e-08 1.50e-07 1.69e-07 erg/cm2
Error 6.52e-09 4.99e-09 7.15e-09 1.40e-08 1.59e-08 2.34e-08 erg/cm2
Peak flux Power-law 1.05e+00 5.57e-01 1.84e-01 7.89e-02 1.83e+00 1.87e+00 ph/cm2/s
Error 1.33e-01 5.40e-02 3.76e-02 2.98e-02 1.68e-01 1.70e-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 5.13e-08 5.03e-08 3.37e-08 3.50e-08 2.70e-07 1.75e-07 erg/cm2
Error 4.98e-09 5.82e-09 5.20e-09 1.66e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.01e+00 5.86e-01 1.65e-01 4.82e-02 1.79e+00 1.81e+00 ph/cm2/s
Error 1.44e-01 7.00e-02 4.71e-02 5.17e-02 1.75e-01 1.89e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.608 0.223 - - 4.83e-03 7.50e-04 59.781 57
CPL 1.954 0.000 2.5 0.0 1.25e-02 0.00e+00 61.439 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.595 0.216 - - 8.79e-03 1.34e-03 70.934 57
CPL 1.943 0.000 3.0 0.0 2.29e-02 0.00e+00 70.323 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: 1.728000 sec.
T50 in the 50-300 keV band: 0.960000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 3.000 -0.704 2.296
T90 3.000 -0.704 2.296
T50 1.000 0.296 1.296
Peak 1.000 0.296 1.296
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
42.9327 +30.2412 0.0089 12.6 38.0 0.3776 21.5 TRIG_00284850
------------------------------------------
Foreground time interval of the image:
-0.704 2.296 (delta_t = 3.000 [sec])
Background time interval of the image:
-239.704 -0.704 (delta_t = 239.000 [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 -0.704 sec. to 2.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.60793 ( -0.216657 0.229711 )
Norm@50keV : 4.833107E-03 ( -7.506176E-04 7.489393E-04) )
------------------------------------------------------------
Chi-Squared = 59.78071 using 59 PHA bins.
Reduced chi-squared = 1.048784 for 57 degrees of freedom
Null hypothesis probability = 0.375
Photon flux (15-150 keV) in 3.000 sec: 1.01587 ( -0.090892 0.09103 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.49611e-07 ( -1.56192e-08 1.61013e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.704 sec. to 2.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95400 ( )
Epeak [keV] : 2.47183 ( )
Norm@50keV : 1.248423E-02 ( )
------------------------------------------------------------
Chi-Squared = 61.43904 using 59 PHA bins.
Reduced chi-squared = 1.097126 for 56 degrees of freedom
Null hypothesis probability = 0.287
Photon flux (15-150 keV) in 3.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.704 sec. to 2.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59023 ( -10.6713 4.32867 )
beta : -2.69998 ( -0.244161 0.215104 )
Epeak [keV] : 12.8192 ( -12.7192 39.7623 )
Norm@50keV : 2.247278E-02 ( -3.42975 42256.6 )
------------------------------------------------------------
Chi-Squared = 60.83459 using 59 PHA bins.
Reduced chi-squared = 1.106084 for 55 degrees of freedom
Null hypothesis probability = 0.274
Photon flux (15-150 keV) in 3.000 sec: 1.01747 ( -0.093877 0.09123 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.69696e-07 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.296 sec. to 1.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.59487 ( -0.209115 0.221910 )
Norm@50keV : 8.791479E-03 ( -1.338931E-03 1.333226E-03) )
------------------------------------------------------------
Chi-Squared = 70.93448 using 59 PHA bins.
Reduced chi-squared = 1.244465 for 57 degrees of freedom
Null hypothesis probability = 0.102
Photon flux (15-150 keV) in 1.000 sec: 1.83252 ( -0.16804 0.16822 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.03426e-08 ( -9.5016e-09 9.7644e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.296 sec. to 1.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94310 ( )
Epeak [keV] : 3.03555 ( )
Norm@50keV : 2.291362E-02 ( )
------------------------------------------------------------
Chi-Squared = 70.32288 using 59 PHA bins.
Reduced chi-squared = 1.255766 for 56 degrees of freedom
Null hypothesis probability = 9.435E-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 0.296 sec. to 1.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51116 ( -8.48884 6.51116 )
beta : -2.79761 ( -7.20239 0.381165 )
Epeak [keV] : 13.2196 ( -15.6819 7.27169 )
Norm@50keV : 4.950184E-02 ( -2.123788E-02 5404.50 )
------------------------------------------------------------
Chi-Squared = 70.41861 using 59 PHA bins.
Reduced chi-squared = 1.280338 for 55 degrees of freedom
Null hypothesis probability = 7.871E-02
Photon flux (15-150 keV) in 1.000 sec: 1.79475 ( -0.17677 0.17319 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.49562e-08 ( -7.9524e-09 1.29089e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 04:14:08 EST 2007