batgrbproduct Analysis for Trigger=287088
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 07:04:11 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger287088/GCN5_download_cron
======================================================================
Trigger: 00287088 Segment: 000
BAT Trigger Time: 208036547.584 [s; MET]
Trigger Stop: 208036551.68 [s; MET]
UTC: 2007-08-05T19:55:45.448360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.043192352659 Dec: -59.9448796085781 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.19
Image Trigger?: NO
Rate S/N Ratio: 11.3137084989848 [ if not an image trigger ]
Image S/N Ratio: 9.19
Flight Position: [ source = BAT ]
RA: 245.043192352659 Dec: -59.9448796085781 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.049690533308 Dec: -59.9599922352396 [deg; J2000]
{ 16h 20m 11.9s , -59d 57' 36.0" }
+/- 1.403727727923 [arcmin] (estimated 90% radius based on SNR)
+/- 0.522950157895985 [arcmin] (formal 1-sigma fit error)
SNR: 18.7376131163551
RA = 16h 20m 11.9s (245.049691 deg.)
Dec = -59d 57' 36" (-59.959992 deg.)
Angular difference between Flight and Ground position is 0.927536 arcmin
Partial Coding Fraction: 0.609375 [ including projection effects ]
Duration
T90: 27.3640000224113 +/- 4.20024239442517
Measured from: 0.680000007152557
to: 28.0440000295639 [s; relative to TRIGTIME]
T50: 15.3760000169277 +/- 2.46085269498558
Measured from: 6.08000001311302
to: 21.4560000300407 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.17200002074242
to: 4.17200002074242 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.61599999666214
to: 35.7000000178814 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.459971 0.412053 0.290759 0.135468
0.037780 0.038017 0.033820 0.029231 [error]
Peak 0.021355 0.025297 0.023735 0.011778
0.006358 0.006522 0.005937 0.004884 [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 1.38e-07 2.06e-07 2.29e-07 4.82e-07 7.18e-07 1.06e-06 erg/cm2
Error 2.29e-08 1.98e-08 3.62e-08 1.65e-07 8.03e-08 1.94e-07 erg/cm2
Peak flux Power-law 1.82e-01 2.07e-01 1.69e-01 2.30e-01 6.42e-01 7.89e-01 ph/cm2/s
Error 8.97e-02 6.16e-02 4.75e-02 1.45e-01 1.66e-01 1.95e-01 ph/cm2/s
Fluence Cutoff-PL 1.38e-07 2.06e-07 2.29e-07 4.78e-07 7.18e-07 1.05e-06 erg/cm2
Error 2.29e-08 1.98e-08 3.63e-08 1.64e-07 8.03e-08 1.93e-07 erg/cm2
Peak flux Cutoff-PL 1.82e-01 2.07e-01 1.69e-01 2.29e-01 6.42e-01 7.87e-01 ph/cm2/s
Error 8.97e-02 6.17e-02 4.75e-02 1.44e-01 1.66e-01 1.95e-01 ph/cm2/s
Fluence Band 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 Band 1.66e-01 2.04e-01 1.71e-01 2.39e-01 6.39e-01 8.05e-01 ph/cm2/s
Error 4.25e-02 5.66e-02 4.25e-02 6.55e-02 2.29e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.845 0.203 - - 2.15e-03 2.38e-04 80.159 57
CPL 1.844 0.204 9967.0 5000.0 2.15e-03 2.39e-04 80.169 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.294 0.462 - - 5.39e-03 1.31e-03 41.499 57
CPL 1.290 0.465 9998.8 5000.0 5.41e-03 1.31e-03 41.505 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: 30.016000 sec.
T50 in the 50-300 keV band: 15.296000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 36.316 -0.616 35.700
T90 27.364 0.680 28.044
T50 15.376 6.080 21.456
Peak 1.000 3.172 4.172
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.0497 -59.9600 0.0102 35.7 -32.5 1.3783 18.7 TRIG_00287088
------------------------------------------
Foreground time interval of the image:
-0.616 35.700 (delta_t = 36.316 [sec])
Background time interval of the image:
-239.584 -0.616 (delta_t = 238.968 [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 -0.616 sec. to 35.700 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84450 ( -0.199567 0.206965 )
Norm@50keV : 2.150581E-03 ( -2.412042E-04 2.338942E-04) )
------------------------------------------------------------
Chi-Squared = 80.15868 using 59 PHA bins.
Reduced chi-squared = 1.406293 for 57 degrees of freedom
Null hypothesis probability = 2.327E-02
Photon flux (15-150 keV) in 36.32 sec: 0.301615 ( -0.029802 0.029908 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.18155e-07 ( -7.9726e-08 8.08737e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.616 sec. to 35.700 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84401 ( -0.200018 0.208212 )
Epeak [keV] : 9967.00 ( -9966.99 32.9961 )
Norm@50keV : 2.154349E-03 ( -2.448329E-04 2.333692E-04) )
------------------------------------------------------------
Chi-Squared = 80.16883 using 59 PHA bins.
Reduced chi-squared = 1.431586 for 56 degrees of freedom
Null hypothesis probability = 1.875E-02
Photon flux (15-150 keV) in 36.32 sec: 0.301474 ( -0.02979 0.029897 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.18141e-07 ( -7.98132e-08 8.08302e-08 ) ergs/cm2
Band function
Time interval is from -0.616 sec. to 35.700 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.46169 ( -7.89831 7.10169 )
beta : -1.79644 ( -0.207076 0.199078 )
Epeak [keV] : 9.70575 ( -9.60575 9990.29 )
Norm@50keV : 6.186166E-03 ( -3.280199E-02 3.177693E-02) )
------------------------------------------------------------
Chi-Squared = 80.31399 using 59 PHA bins.
Reduced chi-squared = 1.460254 for 55 degrees of freedom
Null hypothesis probability = 1.461E-02
Photon flux (15-150 keV) in 36.32 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 3.172 sec. to 4.172 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29372 ( -0.475818 0.448814 )
Norm@50keV : 5.391069E-03 ( -1.309431E-03 1.307954E-03) )
------------------------------------------------------------
Chi-Squared = 41.49923 using 59 PHA bins.
Reduced chi-squared = 0.7280567 for 57 degrees of freedom
Null hypothesis probability = 0.939
Photon flux (15-150 keV) in 1.000 sec: 0.642428 ( -0.165801 0.166599 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.336e-08 ( -1.39438e-08 1.40564e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.172 sec. to 4.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28986 ( -0.478946 0.451788 )
Epeak [keV] : 9998.76 ( -9998.75 1.24121 )
Norm@50keV : 5.414228E-03 ( -1.314075E-03 1.313216E-03) )
------------------------------------------------------------
Chi-Squared = 41.50494 using 59 PHA bins.
Reduced chi-squared = 0.7411596 for 56 degrees of freedom
Null hypothesis probability = 0.926
Photon flux (15-150 keV) in 1.000 sec: 0.642231 ( -0.165753 0.166553 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.33833e-08 ( -1.39632e-08 1.40289e-08 ) ergs/cm2
Band function
Time interval is from 3.172 sec. to 4.172 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04789 ( -8.95211 6.04789 )
beta : -1.28676 ( -8.71324 0.469081 )
Epeak [keV] : 37.3592 ( -37.2592 9962.64 )
Norm@50keV : 1.028551E-02 ( -1.028551E-02 0.944813 )
------------------------------------------------------------
Chi-Squared = 41.50242 using 59 PHA bins.
Reduced chi-squared = 0.7545895 for 55 degrees of freedom
Null hypothesis probability = 0.911
Photon flux (15-150 keV) in 1.000 sec: 0.638885 ( -0.30294 0.154956 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.33352e-08 ( -1.3944e-08 1.40077e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 07:19:06 EST 2007