batgrbproduct Analysis for Trigger=180241
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 10:47:16 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger180241/GCN5_download_cron
======================================================================
Trigger: 00180241 Segment: 000
BAT Trigger Time: 160756465.088 [s; MET]
Trigger Stop: 160756467.136 [s; MET]
UTC: 2006-02-04T14:34:24.092080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 211.794850072626 Dec: 27.6832125602182 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.49
Image Trigger?: NO
Rate S/N Ratio: 13.490737563232 [ if not an image trigger ]
Image S/N Ratio: 8.49
Flight Position: [ source = BAT ]
RA: 211.794850072626 Dec: 27.6832125602182 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 211.802921650703 Dec: 27.6731434013107 [deg; J2000]
{ 14h 07m 12.7s , +27d 40' 23.3" }
+/- 0.806115343081008 [arcmin] (estimated 90% radius based on SNR)
+/- 0.293586548722166 [arcmin] (formal 1-sigma fit error)
SNR: 41.384401976311
RA = 14h 7m 12.7s (211.802922 deg.)
Dec = 27d 40' 23" (27.673143 deg.)
Angular difference between Flight and Ground position is 0.740900 arcmin
Partial Coding Fraction: 0.7734375 [ including projection effects ]
Duration
T90: 139.379999995232 +/- 31.5383525288463
Measured from: -19.4959999918938
to: 119.884000003338 [s; relative to TRIGTIME]
T50: 30.136000007391 +/- 10.0212414321358
Measured from: -7.34000000357628
to: 22.7960000038147 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.04399999976158
to: 6.04399999976158 [s; relative to TRIGTIME]
Total Fluence
Measured from: -24.2759999930859
to: 170.715999990702 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.168877 1.784786 1.353687 0.401542
0.068552 0.070836 0.064418 0.058354 [error]
Peak 0.037272 0.067796 0.042976 0.014630
0.005622 0.006328 0.005863 0.004917 [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 3.98e-07 7.51e-07 1.09e-06 3.40e-06 3.10e-06 5.71e-06 erg/cm2
Error 3.53e-08 3.92e-08 6.46e-08 4.49e-07 1.58e-07 4.94e-07 erg/cm2
Peak flux Power-law 4.23e-01 4.44e-01 3.29e-01 3.94e-01 1.35e+00 1.59e+00 ph/cm2/s
Error 8.01e-02 5.37e-02 4.76e-02 1.14e-01 1.55e-01 1.88e-01 ph/cm2/s
Fluence Cutoff-PL 3.50e-07 7.90e-07 1.14e-06 1.54e-06 2.98e-06 3.85e-06 erg/cm2
Error 4.42e-08 4.67e-08 7.40e-08 7.09e-07 1.78e-07 7.19e-07 erg/cm2
Peak flux Cutoff-PL 3.64e-01 4.99e-01 3.50e-01 1.31e-01 1.31e+00 1.34e+00 ph/cm2/s
Error 9.43e-02 7.37e-02 5.70e-02 1.37e-01 1.61e-01 2.03e-01 ph/cm2/s
Fluence Band 3.42e-07 7.94e-07 1.12e-06 2.26e-06 2.97e-06 4.54e-06 erg/cm2
Error 4.70e-08 5.06e-08 8.54e-08 1.09e-06 1.76e-07 9.46e-07 erg/cm2
Peak flux Band 3.45e-01 5.26e-01 3.25e-01 2.48e-01 1.31e+00 1.44e+00 ph/cm2/s
Error 1.03e-01 7.59e-02 5.21e-02 1.23e-01 1.58e-01 2.23e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.456 0.086 - - 1.67e-03 7.82e-05 47.473 57
CPL 0.835 0.395 98.3 44.2 3.31e-03 1.49e-03 39.039 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.431 0.188 - - 1.10e-02 1.29e-03 45.499 57
CPL 0.370 1.015 72.7 70.3 4.02e-02 7.36e-02 41.222 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: 96.960000 sec.
T50 in the 50-300 keV band: 21.184000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 194.992 -24.276 170.716
T90 139.380 -19.496 119.884
T50 30.136 -7.340 22.796
Peak 1.000 5.044 6.044
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
211.8029 +27.6731 0.0046 31.0 -27.4 3.6780 41.4 TRIG_00180241
------------------------------------------
Foreground time interval of the image:
-24.276 23.613 (delta_t = 47.889 [sec])
Background time interval of the image:
-299.088 -222.762 (delta_t = 76.326 [sec])
-222.088 -24.276 (delta_t = 197.812 [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 -24.276 sec. to 170.716 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45619 ( -8.552575E-02 8.551729E-02) )
Norm@50keV : 1.665053E-03 ( -7.821538E-05 7.816078E-05) )
------------------------------------------------------------
Chi-Squared = 47.47321 using 59 PHA bins.
Reduced chi-squared = 0.8328633 for 57 degrees of freedom
Null hypothesis probability = 0.812
Photon flux (15-150 keV) in 195.0 sec: 0.205513 ( -0.010198 0.010223 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.10356e-06 ( -1.57579e-07 1.58028e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.276 sec. to 170.716 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.834517 ( -0.414611 0.374447 )
Epeak [keV] : 98.3366 ( -20.3790 68.0473 )
Norm@50keV : 3.312038E-03 ( -1.103196E-03 1.874705E-03) )
------------------------------------------------------------
Chi-Squared = 39.03875 using 59 PHA bins.
Reduced chi-squared = 0.6971206 for 56 degrees of freedom
Null hypothesis probability = 0.959
Photon flux (15-150 keV) in 195.0 sec: 0.198532 ( -0.010984 0.010985 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.97609e-06 ( -1.78678e-07 1.78035e-07 ) ergs/cm2
Band function
Time interval is from -24.276 sec. to 170.716 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.808245 ( -0.378178 1.17247 )
beta : -1.94652 ( -8.05348 0.387668 )
Epeak [keV] : 93.3440 ( -44.0176 63.9489 )
Norm@50keV : 3.469773E-03 ( -1.206144E-03 1.469009E-02) )
------------------------------------------------------------
Chi-Squared = 38.70612 using 59 PHA bins.
Reduced chi-squared = 0.7037476 for 55 degrees of freedom
Null hypothesis probability = 0.953
Photon flux (15-150 keV) in 195.0 sec: 0.197693 ( -0.011111 0.011042 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.97141e-06 ( -1.77177e-07 1.74564e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 5.044 sec. to 6.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43125 ( -0.187666 0.189028 )
Norm@50keV : 1.098907E-02 ( -1.291884E-03 1.284977E-03) )
------------------------------------------------------------
Chi-Squared = 45.49867 using 59 PHA bins.
Reduced chi-squared = 0.7982222 for 57 degrees of freedom
Null hypothesis probability = 0.863
Photon flux (15-150 keV) in 1.000 sec: 1.34806 ( -0.15518 0.1553 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05573e-07 ( -1.37193e-08 1.3791e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.044 sec. to 6.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.369806 ( -1.14024 0.889419 )
Epeak [keV] : 72.6957 ( -17.8477 122.721 )
Norm@50keV : 4.021288E-02 ( -2.637123E-02 0.120859 )
------------------------------------------------------------
Chi-Squared = 41.22210 using 59 PHA bins.
Reduced chi-squared = 0.7361090 for 56 degrees of freedom
Null hypothesis probability = 0.930
Photon flux (15-150 keV) in 1.000 sec: 1.30701 ( -0.16094 0.16022 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.7023e-08 ( -1.56322e-08 1.5859e-08 ) ergs/cm2
Band function
Time interval is from 5.044 sec. to 6.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.564255 ( -2.63503 3.27746 )
beta : -1.93444 ( -8.06556 0.441321 )
Epeak [keV] : 50.7924 ( -20.7082 58.9604 )
Norm@50keV : 0.161062 ( -0.142135 88.9515 )
------------------------------------------------------------
Chi-Squared = 39.71460 using 59 PHA bins.
Reduced chi-squared = 0.7220836 for 55 degrees of freedom
Null hypothesis probability = 0.940
Photon flux (15-150 keV) in 1.000 sec: 1.30744 ( -0.16074 0.15489 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.97394e-08 ( -2.31434e-08 1.51666e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 10:59:20 EST 2007