Ready for O4 II: GRANDMA Observations of Swift GRBs during eight-weeks of Spring 2022

We present a campaign designed to train the GRANDMA network and its infrastructure to follow up on transient alerts and detect their early afterglows. In preparation for O4 II campaign, we focused on GRB alerts as they are expected to be an electromagnetic counterpart of gravitational-wave events. Our goal was to improve our response to the alerts and start prompt observations as soon as possible to better prepare the GRANDMA network for the fourth observational run of LIGO-Virgo-Kagra (which started at the end of May 2023), and future missions such as SM. To receive, manage and send out observational plans to our partner telescopes we set up dedicated infrastructure and a rota of follow-up adcates were organized to guarantee round-the-clock assistance to our telescope teams. To ensure a great number of observations, we focused on Swift GRBs whose localization errors were generally smaller than the GRANDMA telescopes' field of view. This allowed us to bypass the transient identification process and focus on the reaction time and efficiency of the network. During 'Ready for O4 II', 11 Swift/INTEGRAL GRB triggers were selected, nine fields had been observed, and three afterglows were detected (GRB 220403B, GRB 220427A, GRB 220514A), with 17 GRANDMA telescopes and 17 amateur astronomers from the citizen science project Kilonova-Catcher. Here we highlight the GRB 220427A analysis where our long-term follow-up of the host galaxy allowed us to obtain a photometric redshift of $z=0.82\pm0.09$, its lightcurve elution, fit the decay slope of the afterglows, and study the properties of the host galaxy

Efectos de la fertirrigación con agua urbana regenerada sobre el suelo, la producción y calidad de pimiento (Capsicum annuum L.) y contenidos de contaminantes

The effects, in greenhouse conditions, of Purified Urban Wastewater (PW) from Almería (Spain), in the fertigation of pepper (Capsicum annuum L.) on sandy mulch soil, were evaluated. Primary, secondary (active sludges) and tertiary (Chlorination + ozonation) purification treatments were applied to wastewater. Irrigation treatments applied were PW, natural Ground Water (GW), Fertilizer PW (FPW) and Fertilizer GW (FGW). The vegetal biomass, yield and fruit quality were controlled. Heavy metals (Cr, Cd, Pb, Ni, Mn, Cu and Zn), arsenic (As) and Polycyclic Aromatic Hydrocarbons (PAH) in water, soil, leaf, and fruit were analysed. The PW presented heavy metal, As and PAH contents acceptable for its use in drip irrigation. In the soil, fertigated with PW, the concentration of heavy metals and As did not increase, whilst the PAH concentration decreased. The PW treatment supplied enough nutrients to obtain yield and fruit quality equal to that of GW with fertilization. A significant saving on N, P and K fertilizers (37%, 66% and 12% respectively) was achieved by using PW. The Cd, Pb and As contents of the fruit did not show risk for human consumption. The total PAH concentrations in the fruit were low, the highest of which was phenathrene, with no carcinogenic signification.Se han evaluado los efectos de la utilización de un agua residual urbana purificada (PW) procedente de la ciudad de Almería (España) para la fertirrigación del cultivo de pimiento (Capsicum annuum L.) en invernadero sobre enarenado. Al agua residual se le aplicó tratamiento de depuración primario, secundario (lodos activados) y terciario (cloración + ozonización). Los tratamientos de fertirrigación fueron: PW, agua natural de origen subterráneo (GW), agua residual urbana depurada con fertilización (FPW) y agua natural de origen subterráneo con fertilización (FGW). Se controlaron la biomasa vegetal, la producción y la calidad del fruto. En las aguas, suelos, hojas y frutos, se analizaron metales pesados (Cr, Cd, Pb, Ni, Mn, Cu and Zn), arsenico (As) e hidrocarburos aromáticos policíclicos (PAH). El PW se consideró apta para uso en riego localizado atendiendo a sus niveles de metales pesados, As y PAH. El tratamiento PW suministró nutrientes suficientes para obtener producción y calidad de pimiento iguales al tratamiento FGW. En suelo, no se observó acumulación de metales pesados ni As y disminuyeron las concentraciones de PAH. Se obtuvieron ahorros significativos de fertilizantes nitrogenados, fosfóricos y potasicos (37, 66 y 12% respectivamente) al utilizar PW. Los contenidos de metales pesados, As y PAH en el fruto no representaron riesgo para el consumo humano. En cuanto a PAH, la mayor concentración registrada fue de fenantreno, compuesto no clasificable como carcinogénico para humanos