Swift observation of AT2024abbv

ATel #16909; S. Campana (INAF-Brera), L. Asquini (INAF-Brera), L. Izzo (INAF-Capodimonte), S. Smartt (Oxford & QUB), M. Landoni (INAF-Brera), P. D'Avanzo (INAF-Brera), D. Young (QUB), K. Smith (QUB), S. Ben-Ami (Weizmann), E. Ofek (Weizmann)
on 15 Nov 2024; 20:51 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Sergio Campana (sergio.campana@brera.inaf.it)

Tweet

We observed the Fast Blue Optical Transient (FBOT) candidate AT2024abbv, now classified as a Type II SN, with Swift starting on 2024-11-14 18:22:49.00 for 2504.793 s (split into two observations 00018927001 and 00018927003). The SN distance is 22.7 Mpc.
The X-ray Telescope did not detect any source at the transient position providing a 0.3-10 keV 3sigma upper limit of <1.56E-02 c/s. Assuming a power-law spectrum with photon index 2, this translates to a 0.3-10 keV unabsorbed flux of <7x10^-13 erg/cm2/s. At the source distance, this equates to a limit on the X-ray luminosity L<4x10^40 erg/s.
The source magnitudes (in the AB system) during the first snapshot, starting at the above-mentioned time, were:
v=15.37+/-0.10 (18s)
b=14.92+/-0.03 (106s)
u=14.73+/-0.03 (153s)
w2=14.45+/-0.03 (163s)
m2=14.49+/-0.03 (66s)
w1=14.58+/-0.03 (695s)
The source magnitudes (in the AB system) during the second snapshot, starting at 2024-11-15 00:06:40.00, were:
v=15.13+/-0.05 (63s)
b=14.87+/-0.03 (63s)
u=14.64+/-0.03 (63s)
w2=14.43+/-0.03 (316s)
m2=14.48+/-0.03 (479s)
w1=14.55+/-0.03 (189s)