Showing results 1 to 18 out of 18
AstroNote 2025-254
Type: Object/s-Discovery/Classification
Released: 2025-08-12 15:15:55
AT2025tpu: Possible very young supernova in IC4769 at 58 Mpc
P.J. Groot (Radboud/UCT/SAAO), E. Zimmerman (Weizmann), H. Tranin (Barcelona), J. van Roestel (Amsterdam), P.M. Vreeswi…
Source Group: BlackGEM
Keywords: Optical, Photometry, Supernova, Time-domain, Transient
Related Objects:
2004ac
RA, DEC:18:47:43.670, -63:08:54.60
(281.931960, -63.148500)
Redshift:
Type:SN Ia
See object 2004ac
,
2025tpu
RA, DEC:18:47:40.504, -63:09:39.50
(281.918767, -63.160972)
Redshift:0.015
Type:SN IIn
See object 2025tpu
A very young supernova candidate, AT2025tpu, is reported by the BlackGEM consortium in the Seyfert 2 galaxy IC 4769 at 58 Mpc. The transient was first detected at q=19.25 and confirmed to be brighten…
AstroNote 2025-246
Type: Object/s-Discovery/Classification
Released: 2025-08-08 13:47:15
NOT spectroscopic classifications of optical transients discovered/co-discovered by the BlackGEM survey
Marco A. Gómez-Muñoz (ICCUB), Gerard García Moreno (ICCUB), Hugo Tranin (ICCUB), Nadejda Blagorodnova (ICCUB), Grace Ka…
Source Group: BlackGEM
Related Objects:
2025pgm [BGEM J003606.29-091722.1]
RA, DEC:00:36:06.273, -09:17:21.84
(9.026139, -9.289401)
Redshift:
Type:SN Ia
See object 2025pgm [BGEM J003606.29-091722.1]
,
2025qgz [BGEM J023141.61+024758.9]
RA, DEC:02:31:41.576, +02:47:59.35
(37.923234, 2.799818)
Redshift:0.028
Type:SN IIP
See object 2025qgz [BGEM J023141.61+024758.9]
,
2025qqh [BGEM J125018.23-061739.7]
RA, DEC:12:50:18.234, -06:17:39.75
(192.575975, -6.294375)
Redshift:0.1
Type:SN Ia
See object 2025qqh [BGEM J125018.23-061739.7]
,
2025rom [BGEM J001725.33+062155.9]
RA, DEC:00:17:25.338, +06:21:55.96
(4.355575, 6.365544)
Redshift:0.1
Type:SN Ia
See object 2025rom [BGEM J001725.33+062155.9]
,
2025roy [BGEM J231232.27-001227.7]
RA, DEC:23:12:32.247, -00:12:27.58
(348.134361, -0.207660)
Redshift:0.077
Type:SN Ia
See object 2025roy [BGEM J231232.27-001227.7]
,
2025qzw [GOTO25etu]
RA, DEC:21:06:38.509, +24:54:15.67
(316.660456, 24.904353)
Redshift:0
Type:CV
See object 2025qzw [GOTO25etu]
,
2025qdv [BGEM J023247.59+004041.5]
RA, DEC:02:32:47.593, +00:40:41.52
(38.198304, 0.678200)
Redshift:0.023
Type:SN IIP
See object 2025qdv [BGEM J023247.59+004041.5]
We report the spectroscopic classification with NOT/ALFOSC of 7 optical transients. 4 SN Ia-norm, 2 SN IIP and 1 CV.
AstroNote 2025-227
Type: Object/s-Discovery/Classification
Released: 2025-07-24 09:30:58
Detection of young transient AT2025rza in the giant elliptical galaxy Centaurus A
P.J. Groot (Radboud/UCT/SAAO) , M. Mlangeni (UCT/SAAO), O. Mogawana (UCT/SAAO), G. Ramsay (Armagh/Warwick), H. Tranin (…
Source Group: BlackGEM
Keywords: Transient, Nova, Supernova, Photometry, Time-domain, Surveys, Galaxy
Related Objects:
2025rza
RA, DEC:13:25:08.954, -43:02:44.35
(201.287308, -43.045653)
Redshift:
Type:
See object 2025rza
The BlackGEM consortium announces the discovery of the young transient BGEM J132508.95-430244.3/AT2025rza, 4 arcminutes away from the center of the giant elliptical galaxy Centaurus A. In the latest…
AstroNote 2025-222
Type: Object/s-Discovery/Classification
Released: 2025-07-21 13:46:36
BlackGEM/GOTO discovery of AT2025rtk in galaxy ESO073-027, also hosting AT2024afbw
P.J. Groot (Radboud/UCT/SAAO) , G. Ramsay (Armagh/Warwick), H. Tranin (Barcelona), J. van Roestel (Amsterdam), P.M. Vre…
Source Group: BlackGEM
Keywords: Supernova, Surveys, Time-domain, Transient
Related Objects:
2024afbw
RA, DEC:20:15:05.850, -70:59:29.76
(303.774375, -70.991600)
Redshift:
Type:
See object 2024afbw
,
2025rtk [BGEM J201505.09-705933.8]
RA, DEC:20:15:05.100, -70:59:33.89
(303.771250, -70.992747)
Redshift:0.0206
Type:SN Ia
See object 2025rtk [BGEM J201505.09-705933.8]
The BlackGEM and GOTO collaborations announce the discovery of AT2025rtk in the emission-line galaxy ESO073-027 at z=0.02 at q=18.8/L=19.02. The host galaxy is also the host of AT2024afbw, discovered…
AstroNote 2025-176
Type: Object/s-Discovery/Classification
Released: 2025-06-06 21:48:01
NOT spectroscopic classifications of optical transients
Gerard García Moreno, Mathias Gort, Nadejda Blagorodnova (ICCUB), John A. Paice (Durham), Marco A. Gómez-Muñoz, Hugo T…
Source Group: BlackGEM
Keywords: Cataclysmic Variable, Microlensing, Supernova
Related Objects:
2020nkz [Gaia20cxx]
RA, DEC:16:04:10.560, +14:56:18.35
(241.044000, 14.938431)
Redshift:0
Type:CV
See object 2020nkz [Gaia20cxx]
,
2025iww [ZTF25aaoqyej]
RA, DEC:14:56:15.284, -05:54:37.35
(224.063685, -5.910376)
Redshift:0.1
Type:SN Ia
See object 2025iww [ZTF25aaoqyej]
,
2025kha [ZTF25aaptvbh]
RA, DEC:14:54:53.363, +05:30:04.21
(223.722345, 5.501170)
Redshift:0.06
Type:SN II
See object 2025kha [ZTF25aaptvbh]
,
2025koz [ZTF25aaqocue]
RA, DEC:16:09:17.649, +09:40:46.49
(242.323537, 9.679582)
Redshift:0.1
Type:SN Ic-BL
See object 2025koz [ZTF25aaqocue]
,
2025lji [KATS25K010]
RA, DEC:22:50:29.060, +65:19:23.30
(342.621083, 65.323139)
Redshift:
Type:
See object 2025lji [KATS25K010]
,
2025ljk [KATS25K012]
RA, DEC:18:24:05.340, -22:33:35.20
(276.022250, -22.559778)
Redshift:0
Type:
See object 2025ljk [KATS25K012]
,
2025ljt [ZTF25aardghz]
RA, DEC:16:53:20.693, -08:25:32.30
(253.336220, -8.425638)
Redshift:0
Type:CV
See object 2025ljt [ZTF25aardghz]
,
2025lsf [GOTO25dad]
RA, DEC:14:27:59.667, +05:38:49.76
(216.998612, 5.647155)
Redshift:0.05
Type:SN II
See object 2025lsf [GOTO25dad]
,
2025lyx [ZTF25aarzkbz]
RA, DEC:20:59:34.251, -17:44:31.49
(314.892711, -17.742080)
Redshift:
Type:
See object 2025lyx [ZTF25aarzkbz]
We report the spectroscopic classification with NOT/ALFOSC of 9 optical transients. 3 CVs, 1 SN Ia, 1 SN Ic-BL, 2 SN II, 1 featureless continuum, and 1 Microlensing event.
AstroNote 2025-154
Type: Object/s-Discovery/Classification
Released: 2025-05-23 13:00:08
Lesedi/Mookodi spectroscopic observations of SN 2025kzr: a supernova with strong flash-ionised features
Simon de Wet (DTU Space), Giorgos Leloudas (DTU Space), Nicolas Erasmus (SAAO)
Source Group: BlackGEM
Related Objects:
2025kzr
RA, DEC:10:29:36.432, -24:06:33.61
(157.401801, -24.109336)
Redshift:0.012689
Type:SN IIn
See object 2025kzr
Related Notes:
2025-153
2025-1542025-05-22 16:14:11
Title: ATLAS25fef (AT2025kzr): discovery of a candidate SN with Pan-STARRS precursor in ESO 501- G 001 (50 Mpc)
Authors: K. W. Smith (Oxford/QUB), D. R. Young, M. Nicholl, M. Fulto…
Source Group: ATLAS
We classify AT2025kzr as a young flash-ionised supernova.
AstroNote 2025-107
Type: Object/s-Discovery/Classification
Released: 2025-04-05 15:35:05
BlackGEM discovery of a young transient in the outskirts of Centaurus A
P.J. Groot (Radboud/UCT/SAAO), F. Stoppa (Oxford), M. Mlangeni (UCT), H. Tranin (Barcelona), J. van Roestel (UvA), E. Z…
Source Group: BlackGEM
Keywords: Surveys, Optical, Transient, Nova, Supernova, Time-domain, Photometry
Related Objects:
2025guz [BGEM J132554.96-430603.3]
RA, DEC:13:25:54.962, -43:06:03.39
(201.479008, -43.100942)
Redshift:
Type:
See object 2025guz [BGEM J132554.96-430603.3]
The BlackGEM Consortium announces the discovery of BGEM J132554.96-430603.3 / AT2025guz, a young (1 day limit), faint (q=20.15) transient located in the outskirts of the nearby giant elliptical galax…
AstroNote 2025-101
Type: Object/s-Discovery/Classification
Released: 2025-03-27 21:56:27
NOT spectroscopic classifications of optical transients discovered/co-discovered by the BlackGEM survey
Nadejda Blagorodnova (ICCUB), David Jones (IAC), Gerard García Moreno (ICCUB), Erez A. Zimmerman (WIS), Moses Mlange…
Source Group: BlackGEM
Related Objects:
2025etc [ATLAS25daj]
RA, DEC:11:16:35.707, -03:41:50.02
(169.148778, -3.697229)
Redshift:0.095
Type:SN Ia
See object 2025etc [ATLAS25daj]
,
2025alg [ATLAS25bdp]
RA, DEC:13:11:46.373, -14:10:41.44
(197.943220, -14.178178)
Redshift:0.04
Type:SN II
See object 2025alg [ATLAS25bdp]
,
2025dcd [ATLAS25cgr]
RA, DEC:12:12:07.397, +23:57:29.29
(183.030821, 23.958137)
Redshift:0.064
Type:SN Ia
See object 2025dcd [ATLAS25cgr]
,
2025ddc [ATLAS25chu]
RA, DEC:12:09:05.626, +15:52:11.11
(182.273441, 15.869752)
Redshift:0.07
Type:SN Ic-BL
See object 2025ddc [ATLAS25chu]
,
2025dht [BGEM J110701.75+035738.4]
RA, DEC:11:07:01.750, +03:57:38.49
(166.757292, 3.960692)
Redshift:0.0613
Type:SN IIn
See object 2025dht [BGEM J110701.75+035738.4]
,
2025err [ATLAS25csk]
RA, DEC:08:19:35.291, +21:02:44.43
(124.897046, 21.045675)
Redshift:0.1
Type:SN Ia
See object 2025err [ATLAS25csk]
,
2025fdq [ZTF25aajygin]
RA, DEC:13:41:00.427, +39:03:29.44
(205.251780, 39.058177)
Redshift:0.02
Type:SN II
See object 2025fdq [ZTF25aajygin]
,
2025feb [ZTF25aajmuaa]
RA, DEC:13:55:13.093, +05:26:22.76
(208.804555, 5.439655)
Redshift:0.094
Type:SN Ia
See object 2025feb [ZTF25aajmuaa]
Related Notes:
2022-191
2025-1012022-08-15 12:08:04
Title: The Next Generation SuperFit (NGSF) tool is now available for online execution on WISeREP
Authors: Samantha Goldwasser, Ofer Yaron, Avner Sass, Ido Irani, Avi…
We report the spectroscopic classification with NOT/ALFOSC of optical transients, including a broad-line SN Ic and a SN IIn.
AstroNote 2025-42
Type: Object/s-Discovery/Classification
Released: 2025-01-29 18:36:55
BlackGEM discovery of AT2025ajq in the outskirts of Centaurus A / NGC 5128
J. Paice (Durham), H. Tranin (Barcelona), P. Groot (Radboud/SAAO/UCT), P.M. Vreeswijk (Radboud), S. Bloemen (Radboud), …
Source Group: BlackGEM
Keywords: Surveys, Time-domain, Photometry, Transient, Optical
Related Objects:
2025ajq [BGEM J132531.65-425836.6]
RA, DEC:13:25:31.656, -42:58:36.66
(201.381900, -42.976850)
Redshift:
Type:
See object 2025ajq [BGEM J132531.65-425836.6]
The BlackGEM Consortium notes that the recently discovered AT2025ajq is located in the outskirts of the giant elliptical galaxy Centaurus A / NGC 5128
AstroNote 2025-27
Type: Object/s-Discovery/Classification
Released: 2025-01-22 18:27:15
BlackGEM discovery of a possible young supernova in NGC 1398 at 24.8 Mpc: AT2025zi
P.J. Groot (Radboud/UCT/SAAO), S. de Wet (DTU), H. Tranin (ICCUB), J. van Roestel (UvA), G. Leloudas (DTU), E. Zimmerma…
Source Group: BlackGEM
Keywords: Transient, Supernova, Optical
Related Objects:
2025zi [BGEM J033854.58-262214.6]
RA, DEC:03:38:54.595, -26:22:14.22
(54.727480, -26.370617)
Redshift:0.0046
Type:SN Iax[02cx-like]
See object 2025zi [BGEM J033854.58-262214.6]
BlackGEM discovery of possible young supernova in NGC 1398 with a 1.96 day explosion constraint.
AstroNote 2025-24
Type: Object/s-Discovery/Classification
Released: 2025-01-16 15:15:52
Classification of the second outburst of AT2024xuo as a likely interacting IIn supernova
N. Blagorodnova (ICCUB), Simon de Wet (DTU), Hugo Tranin (ICCUB), Giorgos Leloudas (DTU), Erez Zimmerman (Weizmann), Ga…
Source Group: BlackGEM
Keywords: Supernova, Transient, Optical
Related Objects:
2024xuo
RA, DEC:10:08:49.736, -67:02:50.70
(152.207233, -67.047417)
Redshift:0.0047
Type:SN IIn
See object 2024xuo
Related Notes:
2024-291
2025-242024-10-11 15:27:10
Title: ATLAS24pgn (AT2024xuo): discovery of a candidate SN in IC 2554 (26 Mpc)
Authors: K. W. Smith (Oxford/QUB), D. R. Young, M. Nicholl, M. Fulto…
Source Group: ATLAS
,
2024-297
2025-242024-10-14 10:52:00
Title: ePESSTO+ spectroscopic classification of optical transients
Authors: T. Kravtsov, C. Humina, N. Koivisto, C. Vassallo, N. Pyykki…
Source Group: ePESSTO+
We report the classification of the most recent outburst of AT2024xuo as a likely interacting SNIIn.
AstroNote 2024-381
Type: Object/s-Discovery/Classification
Released: 2024-12-23 14:07:10
Discovery of BGEM J132515.39-425833.7 / AT 2024aeql : Nova or early SN in Centaurus A / NGC5128
Simo Scaringi (Durham), Gavin Ramsay (Armagh), Hugo Tranin (Barcelona), Jan van Roestel (Amsterdam), Paul Groot (Radbou…
Source Group: BlackGEM
Keywords: Time-domain, Surveys, Photometry, Transient, Optical, Nova, Supernova
Related Objects:
2024aeql
RA, DEC:13:25:15.395, -42:58:33.75
(201.314146, -42.976042)
Redshift:0.002
Type:Nova
See object 2024aeql
BGEM J132515.39-425833.7 / AT2024aeql was recently discovered by the BlackGEM and GOTO telescope arrays at q/L =18.5. The object is located ~2' NW of the core of Centaurus A / NGC 5128, at a distance…
AstroNote 2024-376
Type: Announcement-Tool/Utility
Released: 2024-12-17 18:14:31
BlackGEM Finder Charts with Transient Reports
P.J. Groot (Radboud/UCT/SAAO), P.M. Vreeswijk (Radboud), S. Bloemen (Radboud), H. Tranin (Barcelona), J. van Roestel (U…
Source Group: BlackGEM
Keywords: Time-domain, Surveys, Photometry
BlackGEM Transient Reports come standard with finder charts
AstroNote 2024-342
Type: Object/s-Discovery/Classification
Released: 2024-11-16 22:32:37
Lesedi/Mookodi classification of AT2024abfo as a young Type II supernova in NGC 1493
Simon de Wet, Erez Zimmerman, Nicolas Erasmus
Source Group: BlackGEM
Keywords: Supernova
Related Objects:
2024abfo
RA, DEC:03:57:25.622, -46:11:07.67
(59.356757, -46.185463)
Redshift:
Type:SN II
See object 2024abfo
Related Notes:
2024-341
2024-3422024-11-16 13:35:07
Title: ATLAS24qew (AT2024abfo): discovery of a young candidate SN in NGC 1493 (11 Mpc)
Authors: K. W. Smith (Oxford/QUB), D. R. Young, M. Nicholl, M. Fulto…
Source Group: ATLAS
We classify AT2024abfo as a young Type II supernova in NGC 1493 at 11 Mpc.
AstroNote 2024-255
Type: Object/s-Discovery/Classification
Released: 2024-09-14 10:56:12
BlackGEM and MeerLICHT discovery of possible young supernova in NGC6744 at 7 Mpc: AT2024vjm
P.J. Groot (Radboud/UCT/SAAO), H. Tranin (Barcelona), J. van Roestel (UvA), E. Zimmerman (Weizmann), S. Faris (TelAviv)…
Source Group: BlackGEM
Keywords: Transient, Supernova, Optical
Related Objects:
2024vjm [BGEM J190925.80-635001.7]
RA, DEC:19:09:25.780, -63:50:01.75
(287.357417, -63.833819)
Redshift:0.0028
Type:SN Iax[02cx-like]
See object 2024vjm [BGEM J190925.80-635001.7]
BlackGEM and MeerLICHT discovery of possible very young transient/supernova AT2024vjm at q_AB=18.82 in NGC6744 at 7 Mpc, with 18hrs non-detection window.
AstroNote 2024-75
Type: Object/s-Discovery/Classification
Released: 2024-03-14 17:16:35
BGEM J191145.30-570804.0 (AT2024egc): discovery of a supernova candidate in ESO 184-25 (44Mpc)
Hugo Tranin, Nadia Blagorodnova (ICCUB), Fiorenzo Stoppa, Danielle Pieterse, Paul Groot, Paul Vreeswijk (Radboud Univer…
Source Group: BlackGEM
Keywords: Optical, Time-domain, Supernova
Related Objects:
2024egc [BGEM J191145.30-570804.0]
RA, DEC:19:11:45.308, -57:08:04.06
(287.938783, -57.134461)
Redshift:0.01014
Type:SN IIn
See object 2024egc [BGEM J191145.30-570804.0]
Here we report the BlackGEM discovery of the transient BGEM J191145.30-570804.0 (AT2024egc) in the galaxy ESO 184-25 at magnitude m_q = 17.39 +/- 0.02. At a distance of 44 Mpc, the transient was disc…
AstroNote 2024-63
Type: Object/s-Discovery/Classification
Released: 2024-03-06 13:04:01
Classification of AT2024diq as a flash ionized Type II SN at z=0.0146
Simon de Wet (SAAO, UCT), Orapeleng Mogawana (SAAO, UCT), Nic Erasmus (SAAO), Paul Groot (SAAO,UCT,Radboud), Rachel Bru…
Source Group: BlackGEM
Keywords: Supernova, Transient
Related Objects:
2024diq
RA, DEC:18:38:18.331, -65:25:04.01
(279.576380, -65.417780)
Redshift:0.013
Type:SN II
See object 2024diq
We report the discovery of flash-ionised emission lines in early spectroscopy of AT2024diq.
AstroNote 2024-9
Type: Object/s-Discovery/Classification
Released: 2024-01-07 15:16:36
AT2024qc in WISEA J103650.74-260918.8 at 55 Mpc
Paul Groot (Radboud , UCT, SAAO), Hugo Tranin (U Barcelona), Paul Vreeswijk (Radboud), Gavin Ramsay (Armagh)
Source Group: BlackGEM
Keywords: Time-domain, Surveys, Photometry, Transient, Optical
Related Objects:
2024qc [BGEM J103650.69-260923.7]
RA, DEC:10:36:50.710, -26:09:23.76
(159.211292, -26.156600)
Redshift:0.012
Type:SN II
See object 2024qc [BGEM J103650.69-260923.7]
We report the discovery of AT2024qc in WISEA J103650.74-260918.8 at 55 Mpc, detected at q_AB = 17.5 with the BlackGEM-4 ("Emerald") telescope.

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SN 2023tyk: discovery to spectroscopic classification performed fully automatically
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Onset of SN 2023ixf observed over East Asian longitudes
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ePESSTO+ re-classification of AT2019xis as a light echo of SN 1987A in the LMC.
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Fast Radio Bursts (FRBs) now reported to and distributed via the TNS
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