DRAFT
2021-05-06 20:32:32
Type: Object/s-Data/Analysis
Bibcode: 2021TNSAN.147....1H
Detection of X-ray Emission from ZTF21aayokph (AT2021lfa) with Swift/XRT
Authors: A. Y. Q. Ho (UC Berkeley), Y. Yao (Caltech), and D. A. Perley (LJMU)
Source Group: ZTF
Keywords: X-rays, Transient
Abstract:
We report the detection of luminous X-ray emission from AT2021lfa, with a luminosity typical of long-duration GRB afterglows.

We observed the cosmological fast transient ZTF21aayokph (AT2021lfa; Yao, Perley, and Ho, AstroNote 2021-144) with Swift/XRT. The observation started at 2021-05-05 05:32 UT, corresponding to 1.0d after the first ZTF detection. In a 5ks exposure, we detect X-ray emission with a count rate of 0.0084 +/- 0.0015 ct/s. Using WebPIMMS [1] we estimate [2] that this corresponds to an unabsorbed 0.3-10 keV flux density of 2.9E-13 ergs/cm2/s. At z=1.063 (Yao, Ho, and Perley, AstroNote 2021-145) this is a luminosity of 1.9E45 erg/s, typical of an X-ray afterglow of a long-duration GRB at this epoch [3].

We thank the Swift staff for rapidly approving and executing our observations.

[1] https://heasarc.gsfc.nasa.gov/cgi-bin/Tools/w3pimms/w3pimms.pl 

[2] Using a hydrogen column density of 2.16E20/cm2 (Willingale, R., et al. 2013, MNRAS, 431, 394) and a power-law index of 2

[3] Evans, P.~A., et al. 2007, AAP, 469, 379.

Show current TNS values
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 2021lfa 12:32:48.725 -01:29:22.56 Afterglow 1.063 12:32:48.725 -01:29:22.56
AstroNote Publication Timestamp Title Authors
2021-145 2021-05-05 14:20:21 ZTF21aayokph (AT2021lfa): Redshift from Gemini South Yuhan Yao (Caltech), Anna Ho (UC Berkeley), Daniel Perley (LJMU)
2021-144 2021-05-05 02:09:20 ZTF and LT observations of ZTF21aayokph (AT2021lfa), a fast-fading red transient Yuhan Yao (Caltech), Daniel Perley (LJMU), Anna Ho (UC Berkeley)

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