J/ApJ/814/92 Spitzer IRAC events observed in crowded fields (Calchi+, 2015)
Spitzer IRAC photometry for time series in crowded fields.
Calchi Novati S., Gould A., Yee J.C., Beichman C., Bryden G., Carey S.,
Fausnaugh M., Gaudi B.S., Henderson C.B., Pogge R.W., Shvartzvald Y.,
Wibking B., Zhu W., (the Spitzer team), Udalski A., Poleski R., Pawlak M.,
Szymanski M.K., Skowron J., Mroz P., Kozlowski S., Wyrzykowski L.,
Pietrukowicz P., Pietrzynski G., Soszynski I., Ulaczyk K., (the Ogle group)
<Astrophys. J., 814, 92 (2015)>
=2015ApJ...814...92C 2015ApJ...814...92C (SIMBAD/NED BibCode)
ADC_Keywords: Gravitational lensing ; Ephemerides
Keywords: gravitational lensing: micro - techniques: photometric
Abstract:
We develop a new photometry algorithm that is optimized for the
Infrared Array Camera (IRAC) Spitzer time series in crowded fields and
that is particularly adapted to faint or heavily blended targets. We
apply this to the 170 targets from the 2015 Spitzer microlensing
campaign and present the results of three variants of this algorithm
in an online catalog. We present detailed accounts of the application
of this algorithm to two difficult cases, one very faint and the other
very crowded. Several of Spitzer's instrumental characteristics that
drive the specific features of this algorithm are shared by Kepler and
WFIRST, implying that these features may prove to be a useful starting
point for algorithms designed for microlensing campaigns by these
other missions.
Description:
In Table 1 we list the 170 events monitored in 2015. For each, we
report the event name, the coordinates, the first and last day of
observation, and the number of observed epochs. The events were chosen
based on the microlensing alerts provided by the OGLE (Udalski et al.
2015AcA....65....1U 2015AcA....65....1U) and MOA (Bond et al. 2004ApJ...606L.155B 2004ApJ...606L.155B)
collaborations. The current analysis is based on the preliminary
reduced data made available by the Spitzer Science Center almost in
real time (on average, 2-3 days after the observations). The final
reduction of the data is now publicly available at the NASA/IPAC
Infrared Science Database (IRSA, http://irsa.ipac.caltech.edu/frontpage/).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 61 170 Observed Events
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See also:
II/213 : OGLE Galactic Bulge periodic variables (Udalski+ 1996)
J/AcA/50/1 : OGLE microlensing events in Galactic Bulge (Udalski+, 2000)
J/ApJ/636/240 : OGLE II microlensing parameters (Sumi+, 2006)
J/ApJ/778/150 : Microlensing events toward the Bulge from MOA-II (Sumi+, 2013)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Event Event name (1)
19 A1 --- n_Event [a] Note on Event (2)
21- 30 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
32- 41 F10.6 deg DEdeg Declination in decimal degrees (J2000)
43- 49 F7.2 d HJD1 Heliocentric Julian Date of first Spitzer
observation (HJD-2450000)
51- 57 F7.2 d HJD2 Heliocentric Julian Date of last Spitzer
observation (HJD-2450000)
59- 61 I3 --- Epochs [7/211] Number of observed epochs
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Note (1): We note that two out of the 10 MOA events have also been observed by
the OGLE collaboration (specifically, MOA-BLG-2015-020 and
MOA-BLG-2015-245 are also known as OGLE-BLG-2015-0102 and
OGLE-BLG-2015-1286, respectively), and 64 out of the 160 OGLE events
have also been observed by the MOA collaboration (for the details on
this we refer to the MOA microlensing alert web page
http://www.phys.canterbury.ac.nz/moa/microlensing_alerts.html).
Note (2): Note as follows:
a = This event is also known as OGLE-BLG-2015-1253.
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History:
From electronic version of the journal
(End) Prepared by Tiphaine Pouvreau [CDS] 16-Oct-2017