Observe - Alerts archive
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||Dec||Magnitude||Classification||Comment||Desired follow-up||School|
|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
|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.
|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!
|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'
|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.
|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!
|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
|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.
|Gaia18bdx||5 May 2018, 07:06||166.06666||50.03066||18.75||SN II||candidate SN in outskirts of galaxy UGC 6129, rising||ECS|
|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!