The Zwicky Transient Facility (ZTF) is currently in an extended operational phase aligned with the fourth gravitational-wave observing run of LIGO-Virgo-KAGRA (ZTF-O4). During this phase, the ZTF collaboration conducts a three-night experiment each month, focusing on various scientific cases and survey designs (AstroNotes 2023-349, 2024-59, 2024-96, 2024-123, 2024-135, 2024-172, 2024-216, 2024-261, and AstroNote 2024-266).
In the latest ZTF experiment (from 2024-09-22 02:38 UT to 2024-09-24 12:43 UT), we performed a three-night, daily-cadence, three-band (g, r, i) survey covering 12,000 square degrees of the extragalactic sky. The primary goal was to identify new optical transients and perform spectroscopic classifications down to a limiting magnitude of 19.5 mag (AB, g- or r-band). All three nights had clear weather, with average seeing conditions that allowed continuous observations throughout the night. However, due to lunation constraints, we were unable to observe exactly the same set of fields each night.
We selected new extragalactic transients first detected (by alert photometry) within 7 days from the beginning of the experiment (2024-09-22 02:38 UT) and reached a brightness of 19.8 mag during the three-night observing run. Based on these criteria, we identified 78 transients. During and after the experiment, we conducted spectroscopic follow-up observations using P60/SEDMachine and P200/DBSP, prioritizing brighter transients. This spectroscopic follow-up campaign continued until 18 days after the first night of the experiment. Among the 78 identified transients, 41 reached 19.5 mag during the spectroscopic campaign, of which 40 were observed and 38 were classified. This yielded a final spectroscopic completeness of 97.6% and classification completeness of 95%. The 38 classified transients include 29 SNe Ia, two SNe Ia-91T, one SN Ia-91bg, one SN Ia-pec, two SNe II, one SN Ib, one SN Ibn, and one Galactic transient.
Transients and classifications were reported to the Transient Name Server during both the experiment and follow-up campaign. Below, we summarize the transients discovered and classified during the experiment.
| Catalog | Name | Reported RA | Reported DEC | Reported Obj-Type | Reported Redshift | Host Name | Host Redshift | Remarks | TNS RA | TNS DEC | TNS Obj-Type | TNS Redshift |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TNS | 2024vnl [ZTF24abhxooe] | 17:09:30.570 | +23:36:24.73 | SN Ia | 0.049 | 17:09:30.570 | +23:36:24.73 | SN Ia | 0.049 | |||
| TNS | 2024vpc [ZTF24abhtybk] | 05:45:54.620 | +51:20:56.62 | SN Ia | 0.0335 | 05:45:54.620 | +51:20:56.62 | SN Ia | 0.0335 | |||
| TNS | 2024vkj [ZTF24abhrsjc] | 16:51:55.756 | +74:14:57.82 | SN Ia | 0.127 | 16:51:55.756 | +74:14:57.82 | SN Ia | 0.127 | |||
| TNS | 2024vhg [ZTF24abimksy] | 01:33:50.443 | -14:43:29.24 | SN Ia | 0.082 | 01:33:50.443 | -14:43:29.24 | SN Ia | 0.082 | |||
| TNS | 2024vwd [ZTF24abineem] | 04:39:17.579 | -05:41:00.28 | SN Ia | 0.076 | 04:39:17.586 | -05:41:00.22 | SN Ia | 0.076 | |||
| TNS | 2024vwg [ZTF24abiaxkd] | 04:18:14.319 | -16:42:43.38 | SN II | 0.069 | 04:18:14.319 | -16:42:43.38 | |||||
| TNS | 2024vsd [ZTF24abhzzoq] | 22:21:48.360 | -17:36:38.81 | SN Ia | 0.071 | 22:21:48.360 | -17:36:38.81 | SN Ia | 0.071 | |||
| TNS | 2024vuf [ZTF24abihkka] | 07:25:14.090 | +42:01:17.15 | SN Ia | 0.0581 | 07:25:14.090 | +42:01:17.15 | SN Ia | 0.0581 | |||
| TNS | 2024vvi [ZTF24abiihsz] | 21:31:34.595 | +07:28:15.49 | SN Ia | 0.069 | 21:31:34.595 | +07:28:15.49 | SN Ia | 0.069 | |||
| TNS | 2024vny [ZTF24abhzshd] | 21:33:01.980 | -22:41:41.50 | SN Ia | 0.0333 | LEDA 134291 | 21:33:01.980 | -22:41:41.50 | SN Ia | 0.0333 | ||
| TNS | 2024vta [ZTF24abiesnr] | 02:47:43.930 | -14:52:11.89 | SN Ibn | 0.066 | 02:47:43.930 | -14:52:11.89 | SN Ibn | 0.066 | |||
| TNS | 2024vwf [ZTF24abimqwn] | 07:26:39.592 | +45:11:27.77 | SN Ia | 0.082 | 07:26:39.592 | +45:11:27.77 | SN Ia | 0.082 | |||
| TNS | 2024vvr [ZTF24abifqbz] | 06:51:48.014 | +27:13:42.80 | SN Ia | 0.034 | 06:51:48.014 | +27:13:42.80 | SN Ia | 0.034 | |||
| TNS | 2024vrr [ZTF24abigauq] | 09:16:44.200 | +19:55:57.79 | SN Ib | 0.025762 | 09:16:44.200 | +19:55:57.79 | SN Ib | 0.025762 | |||
| TNS | 2024wdg [ZTF24abihmoo] | 04:45:16.797 | +08:33:15.49 | SN Ia-91bg-like | 0.066 | 04:45:16.797 | +08:33:15.49 | SN Ia-91bg-like | 0.066 | |||
| TNS | 2024vya [ZTF24abimtdl] | 02:37:26.434 | -16:34:48.66 | SN Ia-91T-like | 0.122 | 02:37:26.434 | -16:34:48.66 | |||||
| TNS | 2024vyd [ZTF24abikzjx] | 00:34:22.883 | +10:21:07.12 | SN Ia | 0.04 | 00:34:22.883 | +10:21:07.12 | SN Ia | 0.04 | |||
| TNS | 2024vyi [ZTF24abiktwr] | 00:09:11.762 | -00:36:50.64 | SN Ia | 0.072 | 00:09:11.762 | -00:36:50.64 | SN Ia | 0.072 | |||
| TNS | 2024vvd [ZTF24abiklnb] | 23:16:28.263 | +21:34:38.81 | SN Ia | 0.082 | 23:16:28.263 | +21:34:38.81 | SN Ia | 0.082 | |||
| TNS | 2024vwl [ZTF24abimnpm] | 03:16:43.440 | -15:29:10.36 | SN Ia | 0.0674 | SDSS J031643.50-152910.7 | 03:16:43.440 | -15:29:10.36 | SN Ia | 0.0674 | ||
| TNS | 2024wak [ZTF24abitshb] | 05:01:59.500 | -13:58:21.07 | SN Ia | 0.02 | 05:01:59.500 | -13:58:21.07 | SN Ia | 0.02 | |||
| TNS | 2024vyo [ZTF24abipjoh] | 22:42:22.457 | -13:27:01.15 | SN Ia | 0.078 | 22:42:22.457 | -13:27:01.15 | SN Ia | 0.078 | |||
| TNS | 2024vyj [ZTF24abimpmc] | 01:48:24.798 | +02:28:57.43 | SN Ia | 0.04 | 01:48:24.791 | +02:28:57.43 | SN Ia | 0.04 | |||
| TNS | 2024wda [ZTF24abiptsw] | 23:44:16.940 | -07:33:19.93 | SN Ia | 0.126 | 23:44:16.940 | -07:33:19.93 | |||||
| TNS | 2024wdn [ZTF24abitpxy] | 08:15:21.319 | +58:52:47.41 | SN Ia | 0.091 | 08:15:21.319 | +58:52:47.41 | |||||
| TNS | 2024wps [ZTF24abiyorx] | 04:16:36.821 | -06:02:10.44 | SN Ia | 0.103 | 04:16:36.821 | -06:02:10.44 | SN Ia | 0.103 | |||
| TNS | 2024vwh [ZTF24abifmph] | 07:00:09.776 | +33:09:59.12 | SN Ia | 0.11 | 07:00:09.776 | +33:09:59.12 | SN Ia | 0.11 | |||
| TNS | 2024waj [ZTF24abitsku] | 05:08:00.588 | -08:17:49.41 | SN Ia | 0.126 | 05:08:00.588 | -08:17:49.41 | SN Ia | 0.126 | |||
| TNS | 2024vxf [ZTF24abiiabk] | 16:01:47.286 | +52:48:32.13 | SN Ia | 0.0885 | SDSS J160147.23+524831.7 | 16:01:47.286 | +52:48:32.13 | SN Ia | 0.0885 | ||
| TNS | 2024vwi [ZTF24abicrns] | 17:04:20.519 | +32:49:55.44 | SN Ia-91T-like | 0.088124 | SDSS J170420.46+324954.3 | 0.0881243 | 17:04:20.519 | +32:49:55.44 | SN Ia-91T-like | 0.088124 | |
| TNS | 2024ssj [ZTF24abhztgu] | 21:51:18.799 | +25:10:27.50 | SN Ia | 0.06 | 21:51:18.799 | +25:10:27.50 | SN Ia | 0.06 | |||
| TNS | 2024vty [ZTF24abihuzi] | 20:32:44.995 | +22:15:45.44 | SN Ia | 0.0765 | 20:32:44.995 | +22:15:45.44 | SN Ia | 0.0765 | |||
| TNS | 2024vyf [ZTF24abiiivs] | 22:08:27.924 | +34:03:30.72 | SN Ia-pec | 0.07 | 22:08:27.924 | +34:03:30.72 | SN Ia-pec | 0.07 | |||
| TNS | 2024vwm [ZTF24abiltvb] | 02:00:57.509 | +38:23:49.90 | SN Ia | 0.049 | WISEA J020057.44+382349.5 | 02:00:57.509 | +38:23:49.90 | SN Ia | 0.049 | ||
| TNS | 2024wtc [ZTF24abikzlo] | 23:24:32.426 | +36:11:38.20 | SN Ia | 0.101 | 23:24:32.426 | +36:11:38.20 | SN Ia | 0.101 | |||
| TNS | 2024vxk [ZTF24abiimsa] | 21:39:28.461 | +26:54:18.15 | SN Ia | 0.076 | SDSS J213928.48+265417.4 | 21:39:28.461 | +26:54:18.15 | ||||
| TNS | 2024vvu [ZTF24abihsvi] | 10:04:29.650 | +14:45:50.44 | SN II | 0.023256 | 10:04:29.650 | +14:45:50.44 | SN II | 0.023256 | |||
| TNS | 2024wdl [ZTF24abizbkp] | 04:23:36.037 | +04:22:42.61 | Varstar | 0 | 04:23:36.037 | +04:22:42.61 |
| File | Comments |
|---|---|
 september-ztf-experiment.tsv | The columns are: 1) ZTF ID 2) TNS ID 3) Redshift 4) Type 5) Comment (comments made by the observers) 6) MJD of the first detection 7) time of the first detection, from the beginning of the experiment, in days 8) filter of the first detection 9) brightness (AB mag) of the first detection 10) MJD of the peak 11) time of the peak, from the beginning of the experiment, in days 12) filter of the peak 13) brightness (AB mag) of the peak 14) target selected for spectroscopic follow-up? |