batgrbproduct Analysis for Trigger=276205
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): Thu Dec 13 17:57:29 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger276205/GCN5_download_cron
======================================================================
Trigger: 00276205 Segment: 000
BAT Trigger Time: 198669568 [s; MET]
Trigger Stop: 198669632 [s; MET]
UTC: 2007-04-19T09:59:26.099880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 182.714045406784 Dec: 39.908351699379 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.8
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.8
Flight Position: [ source = BAT ]
RA: 182.714045406784 Dec: 39.908351699379 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 182.755642138944 Dec: 39.9015194262602 [deg; J2000]
{ 12h 11m 01.4s , +39d 54' 05.5" }
+/- 2.40196739432908 [arcmin] (estimated 90% radius based on SNR)
+/- 1.19031093213505 [arcmin] (formal 1-sigma fit error)
SNR: 8.69863450406617
RA = 12h 11m 1.4s (182.755642 deg.)
Dec = 39d 54' 5" (39.901519 deg.)
Angular difference between Flight and Ground position is 1.957951 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 160 +/- 50.5964425626941
Measured from: -31
to: 129 [s; relative to TRIGTIME]
T50: 80 +/- 22.6274169979695
Measured from: 1
to: 81 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 24.5
to: 25.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: -31
to: 161 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.706602 0.563154 0.121742 0.104719
0.060433 0.060506 0.053084 0.045602 [error]
Peak 0.114691 0.076398 0.011877 0.011323
0.017582 0.017565 0.015424 0.013177 [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 2.02e-07 2.16e-07 1.64e-07 2.02e-07 6.58e-07 7.83e-07 erg/cm2
Error 3.03e-08 2.91e-08 4.38e-08 1.02e-07 1.01e-07 1.63e-07 erg/cm2
Peak flux Power-law 6.50e-02 3.45e-02 1.14e-02 4.89e-03 1.14e-01 1.16e-01 ph/cm2/s
Error 1.68e-02 9.66e-03 6.54e-03 5.87e-03 2.55e-02 2.66e-02 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 1.91e-07 2.42e-07 1.29e-07 4.81e-08 5.92e-07 6.25e-07 erg/cm2
Error 3.31e-08 3.81e-08 3.65e-08 9.59e-08 1.18e-07 1.65e-07 erg/cm2
Peak flux Band 6.46e-02 3.47e-02 1.15e-02 1.84e-03 1.17e-01 0.00e+00 ph/cm2/s
Error 1.59e-02 1.41e-02 5.91e-03 2.56e-02 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.398 0.260 - - 3.51e-04 6.88e-05 61.118 57
CPL 1.101 0.000 24.3 0.0 2.36e-03 0.00e+00 58.154 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.595 0.555 - - 5.45e-04 2.40e-04 51.054 57
CPL 1.975 0.000 1.4 0.0 1.38e-03 0.00e+00 50.844 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 192.000 -31.000 161.000
T90 160.000 -31.000 129.000
T50 80.000 1.000 81.000
Peak 1.000 24.500 25.500
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
182.7556 +39.9015 0.0221 1.0 32.3 0.8821 8.7 TRIG_00276205
------------------------------------------
Foreground time interval of the image:
-31.000 71.501 (delta_t = 102.501 [sec])
Background time interval of the image:
-239.000 -31.000 (delta_t = 208.000 [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 -31.000 sec. to 161.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.39840 ( -0.248069 0.271725 )
Norm@50keV : 3.514565E-04 ( -6.902331E-05 6.852811E-05) )
------------------------------------------------------------
Chi-Squared = 61.11816 using 59 PHA bins.
Reduced chi-squared = 1.072248 for 57 degrees of freedom
Null hypothesis probability = 0.330
Photon flux (15-150 keV) in 192.0 sec: 6.496738E-02 ( -0.00777048 0.00777139 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.58141e-07 ( -9.91814e-08 1.03265e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -31.000 sec. to 161.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10082 ( )
Epeak [keV] : 24.3385 ( )
Norm@50keV : 2.364058E-03 ( )
------------------------------------------------------------
Chi-Squared = 58.15382 using 59 PHA bins.
Reduced chi-squared = 1.038461 for 56 degrees of freedom
Null hypothesis probability = 0.396
Photon flux (15-150 keV) in 192.0 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -31.000 sec. to 161.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31268 ( -1.18974 1.99527 )
beta : -3.67402 ( -6.32598 1.24041 )
Epeak [keV] : 22.4053 ( -10.0000 8.13464 )
Norm@50keV : 1.723821E-03 ( -1.723821E-03 3.054932E-02) )
------------------------------------------------------------
Chi-Squared = 58.13568 using 59 PHA bins.
Reduced chi-squared = 1.057012 for 55 degrees of freedom
Null hypothesis probability = 0.361
Photon flux (15-150 keV) in 192.0 sec: 6.306215E-02 ( -0.00801889 0.00772338 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.92009e-07 ( -1.17771e-07 1.17348e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 17.000 sec. to 33.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.59476 ( -0.487038 0.623734 )
Norm@50keV : 5.453693E-04 ( -2.374806E-04 2.419843E-04) )
------------------------------------------------------------
Chi-Squared = 51.05401 using 59 PHA bins.
Reduced chi-squared = 0.8956844 for 57 degrees of freedom
Null hypothesis probability = 0.697
Photon flux (15-150 keV) in 16.00 sec: 0.113669 ( -0.0255015 0.025564 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.97026e-08 ( -2.66496e-08 2.93432e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.000 sec. to 33.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97538 ( )
Epeak [keV] : 1.37627 ( )
Norm@50keV : 1.379394E-03 ( )
------------------------------------------------------------
Chi-Squared = 50.84380 using 59 PHA bins.
but latest trial 0.542564 gives Chi-Squared = 45.3908
Reduced chi-squared = 0.9079250 for 56 degrees of freedom
Null hypothesis probability = 0.670
Photon flux (15-150 keV) in 16.00 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 17.000 sec. to 33.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48043 ( -8.51957 1.08933 )
beta : -7.05877 ( -2.94123 4.94741 )
Epeak [keV] : 15.1414 ( -6.78822 130.984 )
Norm@50keV : 3.032832E-03 ( -3.032832E-03 31043.0 )
------------------------------------------------------------
Chi-Squared = 51.05877 using 59 PHA bins.
Reduced chi-squared = 0.9283412 for 55 degrees of freedom
Null hypothesis probability = 0.626
Photon flux (15-150 keV) in 16.00 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Thu Dec 13 18:12:01 EST 2007