Gaia in the UK

Taking the Galactic Census

Observe - Alerts archive

On this page you can find the list of all Gaia Alerts which were suitable for observing with a small telescope.

Explanation of Alerts table

Alert ID: The name that was assigned to this Alert. Click on the link to see more information about the Alert.
Time: When Gaia first detected this Alert.
RA: The right ascension of the Alert (see Observing advice for more info).
Dec: The declination of the Alert.
Mag: The brightness of the Alert in Gaia magnitudes. For more information on magnitudes, see Observing advice. Note that a lower value for the magnitude means an Alert is brighter, and a higher value means it is fainter.
Classification: What sort of transient each Alert is.
Comment: Any additional information we have about why an alert is interesting, or information such as its distance.
Desired follow-up: Guidelines on what data we need from telescopes such as Faulkes for each Alert.
School: Initials of schools following-up this Alert (see Schools following-up Gaia Alerts).

Alert ID Time RA Decsort ascending Magnitude Classification Comment Desired follow-up School
Gaia16alt 23 Apr 2016, 10:05 325.74996 66.19105 16.90 YSO 1.5 mag decline in YSO V* V350 Cep

Young Stellar Objects (YSOs) sometimes have dips in brightness. We've seen such a dip in Gaia16alt, and we need ri imaging every two nights to confirm!

Gaia18bdx 5 May 2018, 07:06 166.06666 50.03066 18.75 SN II candidate SN in outskirts of galaxy UGC 6129, rising ECS
Gaia16aax 26 Jan 2016, 15:55 218.57701 49.21014 18.33 AGN slowly rising transient in galaxy core

The active galactic nucleus in the centre of this galaxy has started to fade again. It's now at magnitude ~19, so lets keep an eye on it: we need images in u, g, r and i filters about every two weeks.

Gaia17bnl 12 Jun 2017, 22:47 312.75374 44.53049 16.48 YSO 1 mag dip in YSO V1701 Cyg

Young star in the North American Nebula. Appears to fade because of dust in the local environment. Continuous observations preferred in two filters, e.g. V and I

Gaia16apd 16 May 2016, 19:09 180.71544 44.25761 17.35 SLSN Blue transient on top of faint galaxy SDSS J120251.71+441527.4

This is a rare "superluminous supernova" from a exploding star. Unfortunately it's behind the Sun right now, so we can't follow it up!

Gaia16bic 17 Sep 2016, 07:31 122.55712 33.95713 18.00 SN II candidate SN in grand design spiral galaxy NGC 2532

We don't know what type of SN this is yet, but it should be visible at mag~18 at the very end of the night.

Gaia16aye 5 Aug 2016, 00:53 295.00474 30.13149 14.27 ULENS 1.2 mag rise in red star near Galactic Plane

Gaia16aye is our favourite confirmed binary microlensing event. And it's still not over - so please continue observing while it declines back to 'normal'

Gaia16ada 9 Feb 2016, 00:03 188.96784 27.93208 17.72 SN imposter transient near/in NGC4559C spatially coincident with candidate LBV with previous outbursts.

A massive star seems to be undergoing a series of outbursts which we want to monitor. The outburst has faded, but lets keep an eye on it. We'll need a 300 second exposure with the LCOGT 1-m telescopes in the r filter, every month or so. CURRENTLY BEHIND THE SUN!

Gaia16ahw 11 Mar 2016, 19:21 112.57248 25.03203 17.98 SN Ia Blue transient with faint host visible in SDSS aka SN 2016ayg

This was a thermonuclear SN close to maximum brightness with magnitude. Now it's too faint to observe.

Gaia18asi 24 Mar 2018, 01:36 275.09139 7.18534 12.00 XRB bright outburst in Gaia source, aka ASASSN-18ey, aka MAXI J1820+070, candidate X-ray binary

This was discovered first in the optical (by ASAS-SN) then in X-rays, and then we saw it brighten in Gaia. It's very likely to be an X-ray binary with a black hole at the centre. Continued photometric monitoring of this new system is encouraged - especially in a blue filter