J/A+A/711/A38 Euclid Q1. Photometric studies of known transients (Duffy+, 2026)
Euclid: Quick Data Release (Q1). Photometric studies of known transients.
Duffy C., Cappellaro E., Botticella M.T., Hook I.M., Poidevin F.,
Moriya T.J., Chrimes A.A., Petrecca V., Paterson K., Goobar A., Galbany L.,
Kotak R., Gall C., Gutierrez C.M., Tao C., Izzo L., Aghanim N., Altieri B.,
Amara A., Andreon S., Auricchio N., Baccigalupi C., Baldi M., Balestra A.,
Bardelli S., Basset A., Battaglia P., Biviano A., Bonchi A., Branchini E.,
Brescia M., Brinchmann J., Camera S., Capobianco V., Carbone C.,
Carretero J., Casas R., Casas S., Castellano M., Castignani G., Cavuoti S.,
Cimatti A., Colodro-Conde C., Congedo G., Conselice C.J., Conversi L.,
Copin Y., Courbin F., Courtois H.M., Cropper M., Da Silva A., Degaudenzi H.,
De Lucia G., Di Giorgio A.M., Dolding C., Dole H., Dubath F., Duncan C.A.J.,
Dupac X., Dusini S., Ealet A., Escoffier S., Farina M., Faustini F.,
Ferriol S., Fotopoulou S., Frailis M., Franzetti P., Galeotta S., George K.,
Gillis B., Giocoli C., Gomez-Alvarez P., Grazian A., Grupp F., Gwyn S.,
Haugan S.V.H., Hoar J., Hoekstra H., Holmes W., Hormuth F., Hornstrup A.,
Hudelot P., Jahnke K., Jhabvala M., Keihanen E., Kermiche S., Kubik B.,
Kuijken K., Kummel M., Kunz M., Kurki-Suonio H., Le Boulc'h Q.,
Le Brun A.M.C., Le Mignant D., Liebing P., Ligori S., Lilje P.B.,
Lindholm V., Lloro I., Maino D., Maiorano E., Mansutti O., Marcin S.,
Marggraf O., Martinelli M., Martinet N., Marulli F., Massey R.,
Medinaceli E., Melchior M., Mellier Y., Meneghetti M., Merlin E., Meylan G.,
Moresco M., Morris P.W., Moscardini L., Neissner C., Nichol R.C.,
Niemi S.-M., Nightingale J.W., Padilla C., Paltani S., Pasian F.,
Pedersen K., Percival W.J., Pettorino V., Pires S., Polenta G., Poncet M.,
Popa L.A., Raison F., Rebolo R., Renzi A., Rhodes J., Riccio G., Romelli E.,
Roncarelli M., Saglia R., Sakr Z., Sapone D., Sartoris B.,
Schewtschenko J.A., Schirmer M., Schneider P., Schrabback T., Secroun A.,
Seidel G., Serrano S., Simon P., Sirignano C., Sirri G., Skottfelt J.,
Stanco L., Steinwagner J., Tallada-Crespi P., Taylor A.N., Tereno I.,
Toledo-Moreo R., Torradeflot F., Tutusaus I., Valenziano L., Vassallo T.,
Verdoes Kleijn G., Wang Y., Weller J., Zacchei A., Zamorani G., Zerbi F.M.,
Zucca E., Burigana C., Cabanac R., Gabarra L., Scottez V., Scott D.,
Sullivan M.
<Astron. Astrophys. 711, A38 (2026)>
=2026A&A...711A..38D 2026A&A...711A..38D (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry, infrared ; Optical
Keywords: techniques: photometric - surveys - supernovae: general
Abstract:
We report on serendipitous Euclid observations of previously known
transients, using the Euclid Q1 data release. By cross-matching with
the Transient Name Server (TNS) we identify 164 transients that
coincide with the data release. Although the Euclid Q1 release only
includes single- epoch data, we are able to make Euclid photometric
measurements at the location of 161 of these transients. Euclid
obtained deep photometric measurements or upper limits of these
transients in the IE, YE, JE, and HE bands at various phases of the
transient light-curves, including before, during, and after the
observations of ground-based transient surveys. Approximately 70% of
known transients reported in the six months before the Euclid
observation date and with discovery magnitude brighter than 24 were
detected in Euclid IE images. Our observations include one of the
earliest near-infrared detections of a Type Ia supernova (SN 2024pvw)
15 days prior to its peak brightness, and the late-phase (435.9 days
post peak) observations of the enigmatic core-collapse SN 2023aew.
Euclid deep photometry provides valuable information on the nature of
these transients such as their progenitor systems and power sources,
with late time observations being a uniquely powerful contribution. In
addition, Euclid is able to detect the host galaxies of some
transients that were previously classed as hostless. The Q1 data
demonstrate the power of the Euclid data even with only single-epoch
observations available, as will be the case for much larger areas of
sky in the Euclid Wide Survey.
Description:
Complete catalogue of sources considered in the paper.
The table contains all of the sources considered in this work, with
the date of Euclid observation, photometry in each Euclid band, the
error on this photometry, the angular separation from the Euclid
detected source and the TNS reported position. Photometry reported
with > denotes an upper limit. In the notes column the following
convention is adopted: 1 - AGN; 2 - variable star; 3 - nuclear
transient; 4 - bright host; 5 - bad pixels; 6 - point like; 7 - nearby
source.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 131 162 Complete catalogue of sources considered
in the paper (table A1)
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See also:
II/388 : Euclid final merged catalog. Q1 data release
(Euclid Coll., 2025)
J/A+A/711/A10 : Euclid (Q1). Census of dwarf galaxies (Euclid Coll., 2026)
J/A+A/711/A16 : X-ray point-like sources of Euclid (Q1) (Euclid Coll.+, 2026)
J/A+A/711/A37 : Ultracool dwarfs in Euclid Deep Fields (Zerjal+, 2026)
J/A+A/711/A38 : Euclid Q1. Photometric studies of known transients
(Duffy+, 2026)
J/A+A/711/A39 : Euclid Q1. Secondary nuclei in ET galaxies (Fabricius+, 2026)
J/A+A/711/A20 : Galaxies of Euclid (Q1) (Euclid Coll.+, 2026)
J/A+A/711/A24 : Euclid Q1. Little red dots properties (Euclid Coll., 2026)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Source name (AT NNNNaaaa or SN YYYYaaaa)
13- 14 I2 h RAh TNS right ascension (J2000)
16- 17 I2 min RAm TNS right ascension (J2000)
19- 24 F6.3 s RAs TNS right ascension (J2000)
26 A1 --- DE- TNS declination sign (J2000)
27- 28 I2 deg DEd TNS declination (J2000)
30- 31 I2 arcmin DEm TNS declination (J2000)
33- 37 F5.2 arcsec DEs TNS declination (J2000)
39- 49 F11.5 d MJD ?=- Modified Julian date with VIS instrument
51 A1 --- l_IEmag Limit flag on VISmag
52- 57 F6.3 mag IEmag ?=- VIS IE band magnitude
59- 63 F5.3 mag e_IEmag ?=- VIS IE band magnitude error
65- 69 F5.3 arcsec distIE ?=- Separation between the TNS reported position
and the location of the source in IE
71 I1 --- Notes [1/7]?=- Notes (1)
73 A1 --- l_YEmag Limit flag on Ymag
74- 79 F6.3 mag YEmag ?=- NIR YE band magnitude
81- 85 F5.3 mag e_YEmag ?=- NIR YE band magnitude error
87- 91 F5.3 arcsec distYE ?=- Separation between the TNS reported position
and the location of the source in YE
93 A1 --- l_JEmag Limit flag on Jmag
94- 99 F6.3 mag JEmag ?=- NIR JE band magnitude
101-105 F5.3 mag e_JEmag ?=- NIR JE band magnitude error
107-111 F5.3 arcsec distJE ?=- Separation between the TNS reported position
and the location of the source in JE
113 A1 --- l_HEmag Limit flag on Hmag
114-119 F6.3 mag HEmag ?=- NIR HE band magnitude
121-125 F5.3 mag e_HEmag ?=- NIR HE band magnitude error
127-131 F5.3 arcsec distHE ?=- Separation between the TNS reported position
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Note (1): Notes as follows:
1 = AGN
2 = variable star
3 = nuclear transient
4 = bright host
5 = bad pixels
6 = point like
7 = nearby source
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Acknowledgements:
Christopher Duffy, c.j.duffy(at)lancaster.ac.uk
(End) Patricia Vannier [CDS] 29-May-2025