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r<!DOCTYPE HTML>
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<h1>Tomás<br />
Ahumada</h1>
<p> Presidential Postdoctoral Fellow at the California Institute of Technology.</p>
<!-- <p> Fifth year Astronomy PhD Candidate at the University of Maryland and NASA Goddard Space Flight Center.</p> -->
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<span class="date">Last updated <br /> August 29, 2024</span>
<h2><a href="#">Welcome!</a></h2>
<p>The one in the picture is me! I am Tomás Ahumada, a Chilean astronomer searching for optical
counterparts to short gamma-ray bursts and gravitational waves. I am currently a
Presidential Postdoctoral Fellow at the California Institute of Technology (Caltech), where
I am working with Prof. Mansi Kasliwal studying fast evolving transients. I received my
PhD in 2022 from the University of Maryland (UMD), where I conducted my research under the
supervision of Dr. Leo Singer from NASA Goddard Space Flight Center (GSFC).
There, I used the Zwicky Transient Facility (ZTF) to cover large portions
of the sky and maximize the probability to find interesting explosions in the northern nightsky, and
I used a variety of telescopes across the electromagnetic spectrum to monitor and characterize
the newly discover objects assosciated to our searches. <br />
Prior to that, I obtained my undergraduate degree in 2016 from the P. Universidad Católica de Chile where I majored in Astronomy.
While there, I worked with both Prof. Felipe Barrientos and Prof. Karim Pichara on using machine learning algorithms
to find quasars in the ATLAS survey.<br />
During the southern hemisphere summer in 2016, I was part of the Cerro Tololo (CTIO) Reaserch
Experience for Undergraduates and worked with Dr. Bryan Miller (from Gemini Observatory)
on identifying globular clusters of the shell-elliptical galaxy NGC3923.
After my graduation I interned at Gemini and further analyzed the morphology of the galaxy.</p>
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<span class="date">May 12, 2024</span>
<h2><a href="#">GW searches during O4a</a></h2>
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<p>A new paper in the arxiv! We used ZTF to search for optical counterparts of gravitational waves
detected during the first half of the fourth observing run of th International Gravitational Wave
Network (IGWN): https://arxiv.org/abs/2405.12403
Image: Ahumada et al. 2024</p>
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<span class="date">March 11, 2022</span>
<h2><a href="research.html">Follow-up of short gamma-ray bursts with ZTF </a></h2>
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<p>A new paper in the arxiv! We systematically followed-up Fermi-GBM short gamma-ray bursts
with ZTF. These bursts are challenging to follow-up with optical facilities, as their localization spans
hundresds of square degrees, and the expectec optical counterpart fades rapidly. We leveraged the large field
of view of ZTF to search for plausible counterparts and constraint their distribution : https://arxiv.org/abs/2203.11787
Image: Ahumada et al. 2022</p>
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<span class="date">July 26, 2021</span>
<h2><a href="#">GRB200826A</a></h2>
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<a href="#" class="image fit"><img src="images/Short-Long_GRB_Still.jpeg" alt="" /></a>
<p>I led the paper on the shortest gamma-ray burst (GRB) powered by a collapsar published in Nature Astronomy. For this discovery, we triggered the Zwicky Transient Facility on a
Fermi short GRB and after detecting the afterglow, it was clear that the characteristics of this burst were non-typical for a short GRB.
We were granted Director's Discretionary Time at the Gemini telescope
and we discovered a rising source that could only be explained by a underlying supernova. Image: NASA</p>
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<span class="date">January 10, 2021</span>
<h2><a href="#">GRADMAP Winter workshop</a></h2>
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<a href="#" class="image fit"><img src="images/winter_gradmap.jpeg" alt="" /></a>
<p>I got to mentor two fantastic undergraduates during the winter of 2021. Along with Lenin Nolasco (CUNY, NY) and Maria Clara Heringer (UFRJ, Brasil), we worked on supernova light-curve modeling and covered the basics of Python.</p>
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<span class="date">September 14, 2020</span>
<h2><a href="#">S200105ae and S200115j</a></h2>
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<p>We followed-up the neutron star - black hole mergers detected during the third observing run of LIGO/Virgo. Shreya anand and Michael Coughlin were the corresponding authors of this work. Image: Francois Foucart, University of New Hampshire</p>
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<span class="date">April 14, 2021</span>
<h2><a href="#">Interview with Ana Laura, a Mexican science influencer.</a></h2>
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<p>I got to talk for an hour with the famous tiktok science influencer Ana Laura Rendón
(2.9M+ followers on <a href="https://www.tiktok.com/@sciencewithana?lang=es"><b>TikTok</b></a>
and 58k+ followers on <a href="https://www.instagram.com/analaurarendon/?hl=es"><b>Instagram</b></a>) about black holes and my research, in the context of NASA's black hole week.</p>
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