GCN Circular 39698
Subject
EP250302a: Chandra X-ray Detection
Date
2025-03-13T02:48:18Z (a month ago)
From
Brendan O'Connor at Carnegie Mellon University <boconno2@andrew.cmu.edu>
Via
Web form
B. O'Connor (CMU), D. Pasham (MIT), J. Hare (Catholic/GSFC), report on behalf of a larger collaboration:
We observed EP250302a (Dai et al., GCN 39556) with the Chandra X-ray Observatory through Director's Discretionary Time (PI: O'Connor) for ~20 ks starting on 2025-03-11 at 14:04:47 UT, corresponding to 8.9 d (observer frame) after the EP trigger. We detect a clear X-ray source at the position of the optical (Zhu et al., GCN 39550; Busmann et al., GCN 39551; Leonini et al., GCN 39553; Wu et al., GCN 39555; Xin et al., GCN 39558; Adami et al., GCN 39560; Yang et al., GCN 39561; Becerra et al., GCN 39562; Izzo et al., GCN 39564; Pankov et al., GCN 39565; Reguitti, GCN 39568; Komesh et al., GCN 39569; Shilling and Breeveld, GCN 39570; Aryan et al., GCN 39572; Moskvitin et. al, GCN 39576; Wu et. al, GCN 39578; Pankov et. al, GCN 39586; Gupta et. al, GCN 39593) and X-ray (Dai et al., GCN 39556; Page et al. GCN 39557) counterpart at:
RA, DEC (J2000) = 11:18:03.6, +33:35:09.6
with an uncertainty of ~0.8". The source flux is consistent with the afterglow decay inferred from Swift/XRT. Further analysis is planned.
We thank Pat Slane for rapidly approving our DDT request, and the entire staff of the Chandra X-ray Observatory, in particular Vinay Kashyap, for rapidly scheduling these fast observations.