DRAFT
2024-08-06 03:22:52
Type: Object/s-Data/Analysis
Bibcode: 2024TNSAN.214....1M
NuSTAR detection of the FBOT AT2024qfm and evidence for soft X-ray variability from Swift-XRT
Authors: R. Margutti, Nayana A.J., R. Chornock, Wynn Jacobson-Galán, N. LeBaron, E. Wiston (UC Berkeley), H. Sears (Northwestern U), E. Berger (Harvard U), G. Migliori (INAF-IRA), B. Metzger (Columbia), T. Laskar (Utah)
Source Group: TRex
Keywords: X-rays
Abstract:
We report the NuSTAR detection of hard X-rays from the FBOT AT2024qfm and the evidence for soft X-ray variability from Swift-XRT

NuSTAR observations of the FBOT AT2024qfm (Fulton et al., AstroNote 2024-206) obtained at ~9 days rest-frame after first optical detection revealed the presence of a bright hard X-ray source with a 3-30 keV flux of 5.3e-13 erg/s/cm2 (luminosity of 8e43 erg/s at the distance of AT2024qfm; Gillanders et al., AstroNote 2024-210). AT2024qfm is only the second FBOT with well detected hard X-ray emission, after the prototypical event AT2018cow (Margutti et al., 2019, ApJ, 872, 18), and it is more luminous than AT2018cow at the same epoch. We further report evidence for soft X-ray variability on a time-scale of roughly one day based on Swift-XRT observations of AT2024qfm (e.g., obs ID 00016748002 obtained on August 2 revealed 18 counts in a 20 arcsec aperture vs. the 0 counts of obs ID 00016748003 obtained on August 3 with similar aperture and exposure time corresponding to a 3 sigma upper limit of 5 counts).

We thank the entire NuSTAR and Swift teams for their extremely fast response to our triggers which enabled these observations. 

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 2024qfm 23:21:23.461 +11:56:32.04 23:21:23.461 +11:56:32.04
TNS 2018cow [ZTF18abcfcoo] 16:16:00.220 +22:16:04.91 SN Ic-BL 0.014 16:16:00.220 +22:16:04.91 SN Ic-BL 0.014
AstroNote Publication Timestamp Title Authors
2024-210 2024-08-01 20:04:05 Follow-up observations and redshift confirmation of AT2024qfm - a luminous FBOT J. H. Gillanders (Oxford), M. Huber, K. Chambers (IfA), S. J. Smartt (Oxford/QUB), S. Srivastav (Oxford), M. Fulton (QUB), T. W. Chen (NCU), B. Schmidt (ANU), C. R. Angus, T. Moore, M. Nicholl, K. W. Smith, D. R. Young (QUB), H. Stevance (Oxford).
2024-206 2024-07-31 14:34:47 AT2024qfm : a fast, blue, extragalactic transient in ZTF alert stream M. Fulton, (QUB), T.-W. Chen (NCU), S. J. Smartt, S. Srivastav, J. Gillanders, H. Stevance, L. Rhodes, (Oxford), B. Schmidt (ANU), C. Angus, K. W. Smith, D. R. Young, M. Nicholl, T. Moore, M. McCollum, J. Weston, X. Sheng, A. Aamer (QUB), P. Ramsden (QUB/Birmingham), R. Williams, G. Francis (Edinburgh),
2024-208 2024-08-01 17:38:04 Kinder follow-up observations of AT 2024qfm (ZTF24aaxhxhf) C.-H. Lai, A. Aryan (both NCU), S. Yang (HNAS), M. Fulton (QUB), T.-W. Chen, W.-J. Hou, H.-Y. Hsiao, Y.-C. Pan (all NCU), J. Gillanders (Oxford), S. J. Smartt (Oxford/QUB), A. Sankar. K, C.-S. Lin, C.-C. Ngeow, M.-H. Lee, H.-C. Lin, J.-K. Guo (all NCU), G. H. Sun, Z. N. Wang (both HNAS), S. Srivastav (Oxford), T. Moore, C. Angus, and A. Aamer (all QUB) report:
2024-209 2024-08-01 17:56:16 Liverpool Telescope imaging observations of AT2024qfm / ZTF24aaxhxhf Daniel A. Perley (LJMU), Anna Y. Q. Ho (Cornell), Gokul Srinivasaragavan (Maryland), Igor Andreoni (Maryland), Michael W. Coughlin (Minnesota)
2024-211 2024-08-02 19:19:24 VLA Observation of AT2024qfm Anna Y. Q. Ho (Cornell)

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