batgrbproduct Analysis for Trigger=211273
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 13:46:23 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger211273/GCN5_download_cron
======================================================================
Trigger: 00211273 Segment: 000
BAT Trigger Time: 170027456 [s; MET]
Trigger Stop: 170027528 [s; MET]
UTC: 2006-05-22T21:50:54.790500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 19.4995771561348 Dec: 65.2881053913601 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 16.46
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 16.46
Flight Position: [ source = BAT ]
RA: 19.4995771561348 Dec: 65.2881053913601 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 19.4531572282388 Dec: 65.2904551338819 [deg; J2000]
{ 01h 17m 48.8s , +65d 17' 25.6" }
+/- 2.59834402372558 [arcmin] (estimated 90% radius based on SNR)
+/- 1.25273694608709 [arcmin] (formal 1-sigma fit error)
SNR: 7.77489606256587
RA = 1h 17m 48.8s (19.453157 deg.)
Dec = 65d 17' 26" (65.290455 deg.)
Angular difference between Flight and Ground position is 1.172820 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 72 +/-
Measured from: 0
to: 72 [s; relative to TRIGTIME]
T50: 72 +/-
Measured from: 0
to: 72 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 72 second)
Measured from: 0
to: 72 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 72 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.202567 0.273659 0.075591 -0.012576
0.032238 0.030797 0.026606 0.022996 [error]
Peak 0.202567 0.273659 0.075591 -0.012576
0.032238 0.030797 0.026606 0.022996 [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 7.28e-08 9.39e-08 8.86e-08 1.48e-07 3.05e-07 4.09e-07 erg/cm2
Error 1.51e-08 1.50e-08 2.42e-08 7.77e-08 5.73e-08 1.08e-07 erg/cm2
Peak flux Power-law 7.18e-02 5.13e-02 2.42e-02 1.61e-02 1.55e-01 1.63e-01 ph/cm2/s
Error 1.52e-02 8.13e-03 6.39e-03 7.86e-03 2.44e-02 2.59e-02 ph/cm2/s
Fluence Cutoff-PL 6.80e-08 1.25e-07 2.60e-08 1.63e-10 2.18e-07 2.17e-07 erg/cm2
Error 1.58e-08 2.19e-08 2.78e-08 5.04e-09 4.37e-08 4.40e-08 erg/cm2
Peak flux Cutoff-PL 6.44e-02 6.93e-02 8.29e-03 2.83e-05 1.42e-01 1.42e-01 ph/cm2/s
Error 1.55e-02 1.18e-02 7.87e-03 7.96e-04 2.29e-02 2.28e-02 ph/cm2/s
Fluence Band 6.80e-08 1.20e-07 5.45e-08 2.93e-08 2.58e-07 2.97e-07 erg/cm2
Error 2.14e-08 1.75e-08 2.52e-08 5.59e-08 1.03e-07 0.00e+00 erg/cm2
Peak flux Band 6.24e-02 6.72e-02 1.66e-02 4.35e-03 1.50e-01 1.57e-01 ph/cm2/s
Error 1.74e-02 1.15e-02 6.22e-03 1.42e-03 2.38e-02 2.61e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.083 0.282 - - 9.93e-04 2.02e-04 59.686 57
CPL -2.500 1.739 31.2 4.6 1.17e+00 6.77e-01 51.252 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.083 0.282 - - 9.93e-04 2.02e-04 59.686 57
CPL -2.500 1.739 31.2 4.6 1.17e+00 6.77e-01 51.252 0
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 72.000 0.000 72.000
T90 72.000 0.000 72.000
T50 72.000 0.000 72.000
Peak 72.000 0.000 72.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
19.4532 +65.2905 0.0245 29.9 -148.6 0.5026 7.8 TRIG_00211273
------------------------------------------
Foreground time interval of the image:
0.000 33.083 (delta_t = 33.083 [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 33.083 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08336 ( -0.272714 0.290554 )
Norm@50keV : 9.932299E-04 ( -2.035181E-04 2.000595E-04) )
------------------------------------------------------------
Chi-Squared = 59.68617 using 59 PHA bins.
Reduced chi-squared = 1.047126 for 57 degrees of freedom
Null hypothesis probability = 0.378
Photon flux (15-150 keV) in 33.08 sec: 0.154986 ( -0.024376 0.02438 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.04759e-07 ( -5.63002e-08 5.83832e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.083 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49998 ( -0.500021 2.97728 )
Epeak [keV] : 31.1541 ( -3.77420 5.43064 )
Norm@50keV : 1.16862 ( -1.16862 0.185222 )
------------------------------------------------------------
Chi-Squared = 51.25235 using 59 PHA bins.
but latest trial 1.35388 gives Chi-Squared = 2.78205
Reduced chi-squared = 0.9152206 for 56 degrees of freedom
Null hypothesis probability = 0.655
Photon flux (15-150 keV) in 33.08 sec: 0.141904 ( -0.02176 0.024017 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18429e-07 ( -3.51091e-08 5.23084e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.083 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.171089 ( -5.13467 0.325559 )
beta : -2.97401 ( -7.02311 0.447370 )
Epeak [keV] : 31.5429 ( -3.46483 43.0712 )
Norm@50keV : 1.852617E-02 ( -32.6892 99.0865 )
------------------------------------------------------------
Chi-Squared = 52.14272 using 59 PHA bins.
Reduced chi-squared = 0.9480495 for 55 degrees of freedom
Null hypothesis probability = 0.584
Photon flux (15-150 keV) in 33.08 sec: 0.150152 ( -0.02302 0.024598 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5815e-07 ( -5.01374e-08 6.17478e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.083 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08336 ( -0.272714 0.290554 )
Norm@50keV : 9.932299E-04 ( -2.035181E-04 2.000595E-04) )
------------------------------------------------------------
Chi-Squared = 59.68617 using 59 PHA bins.
Reduced chi-squared = 1.047126 for 57 degrees of freedom
Null hypothesis probability = 0.378
Photon flux (15-150 keV) in 33.08 sec: 0.154986 ( -0.024376 0.02438 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.04759e-07 ( -5.63002e-08 5.83832e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.083 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49998 ( -0.500021 2.97728 )
Epeak [keV] : 31.1541 ( -3.77420 5.43064 )
Norm@50keV : 1.16862 ( -1.16862 0.185222 )
------------------------------------------------------------
Chi-Squared = 51.25235 using 59 PHA bins.
but latest trial 1.35388 gives Chi-Squared = 2.78205
Reduced chi-squared = 0.9152206 for 56 degrees of freedom
Null hypothesis probability = 0.655
Photon flux (15-150 keV) in 33.08 sec: 0.141904 ( -0.02176 0.024017 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18429e-07 ( -3.51091e-08 5.23084e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.083 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.171089 ( -5.13467 0.325559 )
beta : -2.97401 ( -7.02311 0.447370 )
Epeak [keV] : 31.5429 ( -4.59500 4.14330 )
Norm@50keV : 1.852617E-02 ( -30.8907 100.450 )
------------------------------------------------------------
Chi-Squared = 52.14272 using 59 PHA bins.
Reduced chi-squared = 0.9480495 for 55 degrees of freedom
Null hypothesis probability = 0.584
Photon flux (15-150 keV) in 33.08 sec: 0.150152 ( -0.02302 0.024598 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5815e-07 ( -5.01374e-08 6.17478e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 13:51:13 EST 2008