<p>&quot;AT&quot; are sources named by the <a href="https://www.wis-tns.org/content/tns-getting-started" rel="nofollow noreferrer">transient name server</a>:</p>
<blockquote>
<p>A name of the form, e.g. 2016ab, defines the object uniquely. Before it is
spectroscopically classified it will have a prefix of &quot;AT&quot;. If classified as a
SN of whichever type, the prefix changes to &quot;SN&quot;.</p>
</blockquote>
<p>&quot;TXS&quot; are sources from the <a href="https://heasarc.gsfc.nasa.gov/W3Browse/all/texas.html" rel="nofollow noreferrer">Texas Survey of radio sources</a>:</p>
<blockquote>
<p>The name is constructed from the hours and minutes of right ascension, the sign of declination, and truncated tenths of degrees of declination: hhmmsddd. Suffixes 'A', 'B', etc., are also used in cases where close sources would otherwise have duplicate names, e.g., 'TXS 0001-234A' and 'TXS 0001-234B'.</p>
</blockquote>

CC BY-SA 4.0
2021-10-22T16:52:37.813Z
2021-10-22T16:52:37.813Z
SpaceCore
<p>I cannot find a site stating what the AT or TXS star/astronomy catalogues are, even though some AT and TXS 'events' have been in the news lately....</p>

CC BY-SA 4.0
2021-10-17T18:45:04.027Z
Where have they been in the news? Can you add links to articles or papers?
Jim421616
<observational-astronomy><astrophysics><radio-astronomy><star-catalogues>
What is the 'AT' astronomical catalogue? And the 'TXS' one? As in AT2019dsg and AT2019fdr?
Kurt Hikes
# What is the 'AT' astronomical catalogue? And the 'TXS' one? As in AT2019dsg and AT2019fdr?

(Asked by: username_0 on 2021-10-17)

I cannot find a site stating what the AT or TXS star/astronomy catalogues are, even though some AT and TXS 'events' have been in the news lately....

**Tags:** observational-astronomy, astrophysics, radio-astronomy, star-catalogues
> **Comments:**
> **username_1**: Where have they been in the news? Can you add links to articles or papers?  

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## 1 answers

### Answer by username_2 on 2021-10-22. Score: 2

"AT" are sources named by the [transient name server](https://www.wis-tns.org/content/tns-getting-started):

> A name of the form, e.g. 2016ab, defines the object uniquely. Before it is
> spectroscopically classified it will have a prefix of "AT". If classified as a
> SN of whichever type, the prefix changes to "SN".

"TXS" are sources from the [Texas Survey of radio sources](https://heasarc.gsfc.nasa.gov/W3Browse/all/texas.html):

> The name is constructed from the hours and minutes of right ascension, the sign of declination, and truncated tenths of degrees of declination: hhmmsddd. Suffixes 'A', 'B', etc., are also used in cases where close sources would otherwise have duplicate names, e.g., 'TXS 0001-234A' and 'TXS 0001-234B'.


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