AstroNote 2020-112

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2020-05-24 19:58:37
Type: Object/s-Discovery/Classification
ZTF Discovery of ZTF20abbiixp: The Likely Optical Afterglow to GRB 200524A
Authors: Anna Y. Q. Ho (Caltech), Yuhan Yao (Caltech), Daniel A. Perley (LJMU) on behalf of the Zwicky Transient Facility collaboration
Source Group: ZTF
The Zwicky Transient Facility (ZTF, Bellm et al. 2019, Graham et al. 2019) discovered ZTF20abbiixp (AT2020kym), a fast transient at 14h12m10.33s +60d54m19.0s (J2000) 213.043037 +60.905288 (J2000) as part of the ZTF Uniform Depth Survey (Goldstein et al. in prep). ZTF20abbiixp was first detected at r~17.4 mag on UT 2020-05-24T06:52:07 and faded by 0.3 mag over the next 30 minutes, with a total of four observations showing continuous fading. The last non-detection was 24 hours prior (2020-05-23T06:43:03) with a limiting magnitude of r>20.4 mag. There is no counterpart in ZTF reference images down to a limiting magnitude of r>22.90. We searched the GCN archive and determined that ZTF20abbiixp is in the error circle of GRB 200524A, which was detected by Fermi-GBM and Fermi-LAT (GCN 27797). The position of ZTF20abbiixp is 0.151 degrees offset from the LAT position, within the 0.2 degree error radius (90% containment). The time of GRB 200524A was 1.802 hours prior to the first detection of ZTF20abbiixp. We conclude that ZTF20abbiixp is very likely to be the GRB afterglow. Follow-up observations are highly encouraged. ZTF is a project led by PI S. R. Kulkarni at Caltech (see ATEL #11266), and includes IPAC; WIS, Israel; OKC, Sweden; JSI/UMd, USA; UW,USA; DESY, Germany; NRC, Taiwan; UW Milwaukee, USA and LANL USA. ZTF acknowledges the generous support of the NSF under AST MSIP Grant No 1440341. Alert distribution service provided by DIRAC@UW. Alert filtering is being undertaken by the GROWTH marshal system, supported by NSF PIRE grant 1545949.
Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2020kym [ZTF20abbiixp]14:12:10.329+60:54:19.0414:12:10.329+60:54:19.04