microlensing photometry

June 1 2022.

ATLAS covers sky to 19.5 at 5 sigma. That's an uncertainty of 20% or 0.2 mag. The all-sky, nightly coverage from multiple sites makes this an excellent resource for microlensing.

Microlensing surveys:
OGLE, Las Campanas in Chile, has been shut down for years due to COVID
MOA in New Zealand
KMTNET has telescopes in Chile, South Africa, Australia.

Web sites with microlensing events (note the anomalous ones are arguably the most interesting)

MOA: http://www.massey.ac.nz/~iabond/moa/alert2022/alert.php
KMTNET: https://kmtnet.kasi.re.kr/ulens/. and https://kmtnet.kasi.re.kr/ulens/event/2022/
OGLE: http://ogle.astrouw.edu.pl/ogle4/ews/ews.html

Galactic bulge reanalysis and compendium from OGLE: https://aasnova.org/2022/05/20/a-massive-reanalysis-of-microlensing-events/

MOA anomaly events http://iral2.ess.sci.osaka-u.ac.jp/~moa/anomaly/

ATLAS forced photometry server: https://fallingstar-data.com/forcedphot/

Some examples:

event	link	RA	DEC	t_o, HJD-24500000	baseline	notes
KMT-2022-BLG-0061	https://kmtnet.kasi.re.kr/ulens/event/2022/view.php?event=KMT-2022-BLG-0061	17:38:26.66	-28:15:44.17	9688.13539	I=16.6	parallax event?
KMT-2022-BLG-1018	https://kmtnet.kasi.re.kr/ulens/event/2022/view.php?event=KMT-2022-BLG-1018	17:49:24.11	-26:16:31.40	9742.62921	I=19.9	long event, going on now
MOA-2022-BLG-275	https://www.massey.ac.nz/~iabond/moa/alert2022/display.php?id=gb9-R-3-150516	17:57:24.45	-29:19:50.96	9728.10	I=20.2	finite source effect
MOA-2021-BLG-015	https://www.massey.ac.nz/~iabond/moa/alert2021/display.php?id=gb3-R-10-38233	17:54:40.47	-32:04:37.96	2459281.18	I=16.5	finite source effect

MOA-2020-BLG-033	https://www.massey.ac.nz/~iabond/moa/alert2020/display.php?id=gb5-R-10-121819	17:55:47.08	-28:38:17.72	2458909.10	I=26	very high amplification, A
MOA-2020-BLG-031	https://www.massey.ac.nz/~iabond/moa/alert2020/display.php?id=gb10-R-4-47615	17:58:21.80	-27:53:10.34	2458920.11	I=16.3, amp=6
MOA-2019-BLG-141	https://www.massey.ac.nz/~iabond/moa/alert2019/display.php?id=gb1-R-4-37369					designated anomaly event- short binary event

KMT-2022-BLG-0061, difference request

JT says 2022 observations from Chile aren't in the forced photometry data, and that the Hawaii telescope stayed in the N after early calendar 2022. So need to look back into previous years.

Brighter ones do better:

Converting to magnitudes, for the more pedestrian among us:

m_AB=-2.5log10(Jy) + 8.90.

ATLAS started operation mid-2015, so it's appropriate to compile a list of events from calendar 2015 to 2022. That spans both OGLE (until 2020) and MOA, not sure about KMT.

MOA to OGLE correspondences: https://www.massey.ac.nz/~iabond/moa/alert2016/moa2ogle.php

MKTnet telescopes go fainter. Use their event catalogs from online data set.

text file columns:

name, DiscoveryField, Class(1=clear, 2=probable), RA, DEC, MJDcenter, duration (days), impact parameter ~ 1/Amplification, Iband1, Iband2, Iband3, Ctype (??), Amplification, other names

Tasks:

1) construct aggregated event list that spans years when ATLAS observed Galactic plane.

DONE- had to clean up changes in data format between years, for KMT alert files, and delete a few incomplete records. KMTevents.txt has around 15,000 candidate bulge events.

event file sorted from bright to faint: KMTeventsSorted.txt

2) for each event, do a query on forced photometry difference photometry for duration spanning 10 event duration times on either side of event center.
3) construct database of event photometry. We should extract both regular and difference image forced photometry.

Things we can do: 1) fill in gaps from Chile and S Africa
2) use multi-band data to plot c vs. o fluxes, investigate blending and chromaticity.
3) added information for anomalous events, temporal coverage.

stress in paper-

MJD coverage, esp for planets. example is MOA-2019-BLG-055 / OGLE-2019-BLG-0109. planet excursion. No planet indication in OGLE data, but it is there in MOA data.