English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present a campaign designed to train the GRANDMA network and itsinfrastructure to follow up on transient alerts and detect their earlyafterglows. In preparation for O4 II campaign, we focused on GRB alerts as theyare expected to be an electromagnetic counterpart of gravitational-wave events.Our goal was to improve our response to the alerts and start promptobservations as soon as possible to better prepare the GRANDMA network for thefourth observational run of LIGO-Virgo-Kagra (which started at the end of May2023), and future missions such as SM. To receive, manage and send outobservational plans to our partner telescopes we set up dedicatedinfrastructure and a rota of follow-up adcates were organized to guaranteeround-the-clock assistance to our telescope teams. To ensure a great number ofobservations, we focused on Swift GRBs whose localization errors were generallysmaller than the GRANDMA telescopes' field of view. This allowed us to bypassthe transient identification process and focus on the reaction time andefficiency of the network. During 'Ready for O4 II', 11 Swift/INTEGRAL GRBtriggers were selected, nine fields had been observed, and three afterglowswere detected (GRB 220403B, GRB 220427A, GRB 220514A), with 17 GRANDMAtelescopes and 17 amateur astronomers from the citizen science projectKilonova-Catcher. Here we highlight the GRB 220427A analysis where ourlong-term follow-up of the host galaxy allowed us to obtain a photometricredshift of $z=0.82\pm0.09$, its lightcurve elution, fit the decay slope of theafterglows, and study the properties of the host galaxy.

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