Observations with the BOOTES Network of the current outburst in the dwarf-nova SW UMa

ATel #14960; I. Perez-Garcia (UMA, Spain), C. Perez del Pulgar (UMA, Spain), A. Reina Terol (UMA, Spain), I. Carrasco-Garcia (UMA, Spain), E. Fernandez Garcia (IAA-CSIC, Spain), A. J. Castro-Tirado (IAA-CSIC, Spain), R. Sanchez-Ramirez (IAA-CSIC, Spain), M. D. Caballero-Garcia (IAA-CSIC, Spain), M. Jelinek (ASU-CAS, Ondrejov, Czech Rep.), I. H. Park (SSKU, Korea), W. H. Lee (SSKU, Rep. of Korea), and D. Hiriart (Instituto de Astronomía, UNAM, Mexico)
on 8 Oct 2021; 14:33 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Maria D. Caballero-Garcia (mcaballero@iaa.es)

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The BOOTES-1A wide field image telescope at the BOOTES-1 station in Mazagon (INTA-CEDEA, Huelva, Spain) telescope automatically detected a rise in the flux of the dwarf nova SW UMa at 02:48:47 UT on 7 Oct 2021. Its optical flux increased to 11 mag. (i.e. an increase of 5 mag.) in clear filter. Following this alert, a set of five images were obtained spanning 2h in total with the BOOTES-1B 0.3m robotic telescope located nearby.

B1A:

10.967 [+/-0.02] - 02:48:40

B1B:

10.953 [+/-0.006] - 03:23:52

10.905 [+/-0.005] - 03:47:51

11.004 [+/-0.007] - 04:12:09

10.857 [+/-0.005] - 04:24:48

10.898 [+/-0.005] - 04:31:01

Hours after, the JG telescope at the BOOTES-5 station in San Pedro Martir Astronomical Observatory in Mexico also gathered a set of images in u, g, r, i, Z and Y filters starting at 12:29:34 UT (i.e. seven hours later).

B5:

11.032 [+/-0.016] - 12:29:34 (clear)

13.391 [+/-0.108] - 12:36:15 (u')

11.196 [+/-0.016] - 12:30:48 (g')

11.389 [+/-0.017] - 12:32:01 (r')

11.579 [+/-0.015] - 12:33:15 (i')

12.326 [+/-0.018] - 12:34:07 (Z)

16.384 [+/-0.024] - 12:35:23 (Y)

The following night (7 Oct), the COLORES spectrograph at the TELMA telescope (BOOTES-2 station) took a set of 10 spectra in the 3000-11000A wavelength range, starting at 23:30 UT. Whilst a noticeable blue spectrum is observed (indicating the possible X-ray activity of the dwarf nova) neither clear absorption nor emission lines are visible. The flux is still high (g=11 mag.) indicating that further activity is currently on-going.

Observations at other wavelengths are encouraged.