GCN Circular 42270

Subject

GRB 251014A: VLT/FORS2 Optical Observation

Event

GRB 250821A

Date

2025-10-14T21:28:42Z (a month ago)

Edited On

2025-10-14T22:25:29Z (a month ago)

From

Roberto Ricci at INAF-IRA <ricci@ira.inaf.it>

Edited By

Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Roberto Ricci at INAF-IRA <ricci@ira.inaf.it>

Via

Web form

Muskan Yadav  (U Rome), Roberto Ricci (U Rome), Yu-Han Yang (U Rome), Rosa L. Becerra (U Rome) and Eleonora Troja (U Rome) report on behalf of the ERC BHianca team:

We observed the field of GRB 251014A detected by Fermi (Fermi Team et al., GCN 42237Loading...
 
 ) and Swift/BAT (Ambrosi  et al., GCN 42238Loading...
 
 ) with the FORS2 imager on the ESO VLT UT1 (Antu). Observations began 7.55 hours after the trigger and were carried out in the R filter with an average airmass of ~1.5.

Having no reference image deep enough to compare with our science image, at this stage  we are not able to determine whether there are new sources down to the limiting magnitude probed by FORS2. Further observations or an arcsec X-ray counterpart are required to make such a claim. 

We thank the staff at the VLT for the rapid execution of these observations.