astro-legacy-archive/erosita-dr1-events

eROSITA-DE DR1 calibrated events

python -m venv .venv && .venv/bin/pip install datasets huggingface_hub pyarrow

[image]

This is field 117048's calibrated event-list product from eROSITA-DE DR1. The release contains the 2,248 tiles on which the German consortium has rights and 199 shared-rights tiles with partial eROSITA-DE data; this rights partition is not the same claim as geometrically complete coverage of the western Galactic hemisphere. Every table in the served field file is retained.

This dataset contains all 3,616 EVENTS rows in field 117048, including the source uint8 columns. Its self-description carries all 63 source companion tables—attitude, dead-time, bad-pixel, housekeeping, GTI and flare GTI—under their verbatim identities and shapes.

from datasets import load_dataset
dataset = load_dataset("astro-legacy-archive/erosita-dr1-events", "eb01_117048_020_EventList_c010__EVENTS", split="train[:1]")

import json
from huggingface_hub import hf_hub_download
import pyarrow.parquet as pq
path = hf_hub_download("astro-legacy-archive/erosita-dr1-events", "eb01_117048_020_EventList_c010__EVENTS.parquet", repo_type="dataset")
print(json.loads(pq.read_metadata(path).metadata[b"event_list"])["schema"])

Source pin

Observed 2026-09-01: `eb01_117048_020_EventList_c010.fits.gz`, 2,940,786 bytes, SHA-256 105e03db2925b9ea5db95f0fce119ada7f1924854b9d8be8914f973c1b38b055.

The official DR1 site expressly provides whole-archive and subset mirroring. Its required acknowledgement is:

This work is based on data from eROSITA, the soft X-ray instrument aboard SRG, a joint Russian-German science mission supported by the Russian Space Agency (Roskosmos), in the interests of the Russian Academy of Sciences represented by its Space Research Institute (IKI), and the Deutsches Zentrum für Luft- und Raumfahrt (DLR). The SRG spacecraft was built by Lavochkin Association (NPOL) and its subcontractors, and is operated by NPOL with support from the Max Planck Institute for Extraterrestrial Physics (MPE). The development and construction of the eROSITA X-ray instrument was led by MPE, with contributions from the Dr. Karl Remeis Observatory Bamberg & ECAP (FAU Erlangen-Nuernberg), the University of Hamburg Observatory, the Leibniz Institute for Astrophysics Potsdam (AIP), and the Institute for Astronomy and Astrophysics of the University of Tübingen, with the support of DLR and the Max Planck Society. The Argelander Institute for Astronomy of the University of Bonn and the Ludwig Maximilians Universität Munich also participated in the science preparation for eROSITA.

For this release cite Merloni et al. (2024), A&A 682, A34, “The SRG/eROSITA all-sky survey — First data release and X-ray catalog of the western Galactic hemisphere.” The canonical acknowledgement page also lists Predehl et al. (2021), A&A 647, A1, for the eROSITA instrument, and Sunyaev et al. (2021), A&A 656, A132, for the SRG mission. For eSASS cite Brunner et al. (2022), A&A 661, A1.

The released EVENTS rows have already been selected to PI=0.2--10 keV, valid PAT_TYP values 1--4 (PAT_SEL=15), and flag mask 0xE000F000. PI is calibrated and recombined energy in eV, while PHA is raw amplitude in ADU. EV_WEIGHT is presently unused and is exactly zero in all 3,616 rows. RA and DEC are FK5 J2000 coordinates.

eSASS defines TIME as FRAMETIME, without default time randomisation or barycentric correction. Reconstructed frame time is accurate to about 10 ms, but is subject to roughly 14 ms/day spacecraft-clock drift and resets near a one-second accumulated offset; this file has 497 rows where TIME differs from FRAMETIME by exactly one second. RECORDTIME is the direct, more reliable telemetry-frame clock value but has only typical 1--3 s accuracy. The FITS epoch is the scalar MJDREF=51543.875; the artifact mirrors that scalar form without splitting it into MJDREFI and MJDREFF.

The GTIn tables describe good times corresponding to EVENTS. FLAREGTIn tables carry flare-screening intervals for downstream selection; their presence alone does not prove that EVENTS was filtered by them.

TM5 and TM7 are affected by a spatially and temporally varying optical light leak. Their higher thresholds reduce low-energy coverage, the energy scale can shift by as much as 100 eV, and MPE advises that these modules should not yet be regarded as calibrated for this effect.

The DR1 overview says, “The German eROSITA Consortium (eROSITA-DE) makes public the first six months of the SRG/eROSITA all-sky survey (eRASS1) data whose proprietary rights lie with the German eROSITA consortium.” The mirroring page says, “However, if you would like to copy the entire archive or a subset of the file types, we provide a simple mirroring script.” The acknowledgement page says, “All publications based on eROSITA-DE data must include the following text:” None of those pages publishes a named dataset licence or explicit redistribution terms; the licence remains unknown.

Errata and requests

Report corrections or dataset requests in the dataset's Community tab.