batgrbproduct Analysis for Trigger=307208
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): Sat Mar 22 09:24:29 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger307208/GCN5_download_cron
======================================================================
Trigger: 00307208 Segment: 000
BAT Trigger Time: 227833296 [s; MET]
Trigger Stop: 227833360 [s; MET]
UTC: 2008-03-21T23:01:33.339800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 250.496130529588 Dec: -45.556302150037 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.23
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.23
Flight Position: [ source = BAT ]
RA: 250.496130529588 Dec: -45.556302150037 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 250.497356959369 Dec: -45.5728307593513 [deg; J2000]
{ 16h 41m 59.4s , -45d 34' 22.2" }
+/- 3.09416384754888 [arcmin] (estimated 90% radius based on SNR)
+/- 2.06804613299312 [arcmin] (formal 1-sigma fit error)
SNR: 6.05818074671878
RA = 16h 41m 59.4s (250.497357 deg.)
Dec = -45d 34' 22" (-45.572831 deg.)
Angular difference between Flight and Ground position is 0.993054 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.259323 0.161854 -0.086717 0.029424
0.042747 0.038095 0.032824 0.029282 [error]
Peak 0.259323 0.161854 -0.086717 0.029424
0.042747 0.038095 0.032824 0.029282 [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 6.24e-08 4.74e-08 2.40e-08 1.75e-08 1.42e-07 1.52e-07 erg/cm2
Error 1.77e-08 1.70e-08 1.60e-08 2.37e-08 4.79e-08 5.83e-08 erg/cm2
Peak flux Power-law 3.24e-02 1.39e-02 3.51e-03 1.09e-03 5.04e-02 5.09e-02 ph/cm2/s
Error 9.37e-03 4.80e-03 3.06e-03 1.40e-03 1.41e-02 1.43e-02 ph/cm2/s
Fluence Cutoff-PL 7.04e-08 6.36e-08 3.79e-09 1.98e-12 1.38e-07 1.38e-07 erg/cm2
Error 1.97e-08 2.00e-08 6.04e-09 5.60e-11 3.46e-08 3.45e-08 erg/cm2
Peak flux Cutoff-PL 3.58e-02 1.91e-02 6.09e-04 1.52e-07 5.54e-02 5.54e-02 ph/cm2/s
Error 1.02e-02 5.44e-03 1.00e-03 5.06e-06 1.31e-02 1.31e-02 ph/cm2/s
Fluence Band 6.17e-08 6.03e-08 1.24e-08 3.18e-10 1.37e-07 1.66e-07 erg/cm2
Error 2.19e-08 5.00e-09 3.27e-08 6.34e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 3.56e-02 1.91e-02 3.72e-04 1.58e-06 5.50e-02 5.36e-02 ph/cm2/s
Error 7.12e-03 6.56e-03 3.86e-04 1.79e-04 1.29e-02 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.003 0.560 - - 1.83e-04 9.58e-05 76.050 57
CPL -2.499 0.000 23.1 3.9 1.70e+00 4.77e+00 63.757 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.003 0.560 - - 1.83e-04 9.58e-05 76.050 57
CPL -2.499 0.000 23.1 3.9 1.70e+00 4.77e+00 63.757 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
250.4974 -45.5728 0.0315 1.1 47.3 0.4760 6.1 TRIG_00307208
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.00317 ( -0.528617 0.590749 )
Norm@50keV : 1.825254E-04 ( -8.495236E-05 1.067098E-04) )
------------------------------------------------------------
Chi-Squared = 76.04977 using 59 PHA bins.
Reduced chi-squared = 1.334206 for 57 degrees of freedom
Null hypothesis probability = 4.669E-02
Photon flux (15-150 keV) in 64.00 sec: 5.043386E-02 ( -0.0140313 0.014096 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41866e-07 ( -4.5479e-08 5.03469e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49858 ( )
Epeak [keV] : 23.1360 ( -3.59664 4.14363 )
Norm@50keV : 1.70188 ( -3.86281 5.68087 )
------------------------------------------------------------
Chi-Squared = 63.75736 using 59 PHA bins.
Reduced chi-squared = 1.138524 for 56 degrees of freedom
Null hypothesis probability = 0.222
Photon flux (15-150 keV) in 64.00 sec: 5.538062E-02 ( -0.0131471 0.0131228 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37868e-07 ( -3.41811e-08 3.50035e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34953 ( -0.405865 0.594865 )
beta : -9.23935 ( -0.760651 8.61943 )
Epeak [keV] : 10.8519 ( -1.48360 7.64801 )
Norm@50keV : 3.142600E-03 ( -28.6468 73.8481 )
------------------------------------------------------------
Chi-Squared = 69.92237 using 59 PHA bins.
Reduced chi-squared = 1.271316 for 55 degrees of freedom
Null hypothesis probability = 8.479E-02
Photon flux (15-150 keV) in 64.00 sec: 5.497770E-02 ( -0.0128526 0.0129124 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36802e-07 ( -3.21485e-08 3.33325e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.00317 ( -0.528617 0.590749 )
Norm@50keV : 1.825254E-04 ( -8.495236E-05 1.067098E-04) )
------------------------------------------------------------
Chi-Squared = 76.04977 using 59 PHA bins.
Reduced chi-squared = 1.334206 for 57 degrees of freedom
Null hypothesis probability = 4.669E-02
Photon flux (15-150 keV) in 64.00 sec: 5.043386E-02 ( -0.0140313 0.014096 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41866e-07 ( -4.5479e-08 5.03469e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49858 ( )
Epeak [keV] : 23.1360 ( -3.59664 4.14363 )
Norm@50keV : 1.70188 ( -3.86281 5.68087 )
------------------------------------------------------------
Chi-Squared = 63.75736 using 59 PHA bins.
Reduced chi-squared = 1.138524 for 56 degrees of freedom
Null hypothesis probability = 0.222
Photon flux (15-150 keV) in 64.00 sec: 5.538062E-02 ( -0.0131471 0.0131228 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37868e-07 ( -3.41811e-08 3.50035e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34953 ( -0.405865 0.594865 )
beta : -9.23935 ( -0.760651 9.04282 )
Epeak [keV] : 10.8519 ( -1.48360 7.64801 )
Norm@50keV : 3.142600E-03 ( -28.6468 73.8481 )
------------------------------------------------------------
Chi-Squared = 69.92237 using 59 PHA bins.
Reduced chi-squared = 1.271316 for 55 degrees of freedom
Null hypothesis probability = 8.479E-02
Photon flux (15-150 keV) in 64.00 sec: 5.497770E-02 ( -0.0128526 0.0129124 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36802e-07 ( -3.21485e-08 3.33325e-08 ) ergs/cm2
Plot creation:
Sat Mar 22 09:35:13 EDT 2008