TITLE: GCN CIRCULAR NUMBER: 38119 SUBJECT: GRB 241105A: ePESSTO+ NTT optical afterglow detection DATE: 24/11/07 21:17:07 GMT FROM: Paolo D'Avanzo at INAF - OAB paolo.davanzo@inaf.it
K. Tsalapatas, Y. Hu, P. J. Pessi (Stockholm), P. D'Avanzo (INAF-OAB), D. B. Malesani (DAWN/NBI and Radboud univ.), A. Gangopadhyay, A. Singh, A. Gkini, J. Sollerman, S. Barmentloo (Stockholm), T. Kravtsov (Turku), G. Pignata (UTA), J. Anderson (ESO), T.-W. Chen (NCU), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), T. Müller Bravo (Trinity), O. Yaron (Weizmann), D. Young (QUB), S. Benetti (INAF), E. Zimmerman (Weizmann), Asaf Horowicz (Weizmann), J. Tonry, L. Denneau, H. Weiland, A. Lawrence, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), S. J. Smartt (Oxford/QUB), K. W. Smith, S. Srivastav, D. R. Young, M. Fulton, M. McCollum, T. Moore, M. Nicholl, J. Weston (QUB), L. Shingles (GSI/QUB), L. Rhodes (Oxford), J. Sommer (LMU/QUB), A. Rest (STScI), C. Stubbs (Harvard) report:
We observed the field of GRB 241105A (Fermi GBM team, GCN 38085; DeLaunay et al., GCN 38091; Frederiks et al., GCN 38103) under the advanced Public ESO Spectroscopic Survey for Transient Objects (ePESSTO+; see Smartt et al. 2015, A&A, 579, 40; http://www.pessto.org). The observations were performed with the ESO New Technology Telescope (NTT) at La Silla equipped with the EFOSC2 instrument in imaging mode, starting on 2024 Nov 06 at 03:21:27 UT (i.e. about 1.47 days after the burst) using the r and z gunn filters.
The optical afterglow (Julakanti et al., GCN 38088) is clearly detected in both bands. From preliminary photometry, we estimate a magnitude of r = 22.4 +/- 0.1 (AB; calibrated against the ATLAS REFCAT2 catalogue; Tonry et al. 2018). This result is in agreement with the report from Dichiara et al. (GCN 38111).
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