GCN Circular 39907
Subject
EP250302a: SPI-ACS/INTEGRAL Upper Limit
Date
2025-03-28T13:40:48Z (5 days ago)
Edited On
2025-03-28T14:11:48Z (5 days ago)
From
Alexei Pozanenko at IKI, Moscow <grb.alex@gmail.com>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Alexei Pozanenko at IKI, Moscow <grb.alex@gmail.com>
Via
email
P. Minaev (IKI), A. Pozanenko (IKI), S. Grebenev (IKI), I. Chelovekov (IKI)
and IKI GRB-FuN
We searched the INTEGRAL dataset for gamma-ray emission from the X-ray
transient EP250302a, detected with WXT EP (Dai et al., GCN 39556). No
significant excess above the background was detected during the EP250302a
in any of the detectors. The source EP250302a is located 71 degrees
off-axis of the INTEGRAL telescopes' field of view. In particular, for the
SPI-ACS detector, the upper limit (3-sigma) for the fluence from an event
with a duration of 100 sec (during the first and second EP250302a episodes)
is 3.2e-6 erg*cm^-2 using the softest simulated CPL spectrum with Ep = 20
keV. The SPI-ACS estimating is based on the calibration given in the paper
https://ui.adsabs.harvard.edu/abs/2023MNRAS.525.2411M
We thank the INTEGRAL Observatory and all the staff who have served it for
over 22 years. Blessed be the memory of its deeds.