{"id":"82be0a66-8701-45af-b009-0aecba12b892","arxiv_id":"2605.25689","paper_version":2,"verdict":"UNVERDICTED","confidence":"LOW","novelty_score":4.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":3,"one_line_summary":"Extreme optical/MIR color-magnitude variability efficiently selects turn-on changing-look AGNs, with seven of twelve candidates spectroscopically confirmed and several linked to multi-year flares.","lead":"Photometric color-magnitude variability selected 12 Type-2 AGN candidates; spectroscopy confirmed seven turn-on changing-look AGNs. Extreme bluer-when-brighter swings may flag AGNs in a short-lived, accretion-enhanced state.","discovery_kind":"extension","skeptic_critique":{"model":"grok-4.5","headline":"Missing correct full text leaves selection purity and flare–turn-on causality untestable; 7/12 efficiency claim cannot be stress-checked.","rationale":"The reader correctly diagnosed that the cache supplies the wrong manuscript and therefore correctly left the paper UNVERDICTED with low confidence. The load-bearing soft spot is precisely the one the reader flagged: the photometric cuts and the 3–7 yr flare associations are asserted in the abstract but cannot be audited for contamination or chance coincidence without the missing methods, tables, and light curves. No stronger internal inconsistency can be demonstrated until the correct text is available; hence the verdict remains UNVERDICTED and no adjustment is warranted.","tokens_in":9574,"tokens_out":485,"duration_ms":16671,"concrete_test":"Obtain the authentic arXiv:2605.25689 PDF. Apply the exact published CM slope/amplitude/Δm cuts to a size-matched control sample of non-CL Type-2 SDSS AGNs and recompute the confirmation fraction; separately, randomize the flare epochs 10^4 times and measure the fraction of trials that produce ≥4 associations within 3–7 yr. If purity falls below ~50 % or the observed associations are consistent with the null, the efficiency and causal claims are unsupported.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The strongest claim—that extreme CM variability (large k, optical/MIR amplitudes, Δm_opt > 0.9) is a highly efficient photometric selector of turn-on CL-AGNs—rests on a 7/12 spectroscopic confirmation rate plus the assertion that four flare-like brightenings lie 3–7 yr from the spectroscopic transitions and therefore trace accretion-driven BLR re-illumination. Both the purity of the photometric cuts against ordinary AGN variability or host contamination and the statistical significance of the temporal associations require the detailed selection thresholds, control-sample comparisons, light-curve statistics, and false-positive rates that appear only in the (missing) full manuscript. The supplied cache contains an unrelated multi-behavior recommendation paper, so those quantities remain inaccessible; without them the efficiency claim and the “pivotal-state” interpretation cannot be distinguished from selection artifacts or chance coincidence in a variable population.","agreement_with_reader":"agree"},"referee_report":{"model":"grok-4.5","summary":"The manuscript (as represented by its abstract and claimed scope) proposes that extreme colour–magnitude (CM) variability—specifically a steep bluer-when-brighter slope k together with large optical and mid-infrared amplitudes and optical magnitude changes >0.9—is a highly efficient photometric criterion for selecting turn-on changing-look AGNs (CL-AGNs). From Type-2 SDSS AGNs the authors select 12 candidates, obtain new spectra with the 3.6-m DOT and 2-m HCT, and spectroscopically confirm 7 turn-on CL-AGNs. They further report that the confirmed objects show larger optical/MIR variations and k values than both the general AGN population and a spectroscopically identified CL-AGN comparison sample, that the extreme CM episodes occurred recently, and that for four sources flare-like brightenings lie within 3–7 years of the spectroscopic turn-on, which they interpret as short-timescale accretion enhancement and BLR re-illumination. They conclude that such objects may occupy a “pivotal” accretion-enhanced state on multi-year timescales.","tokens_in":9789,"tokens_out":840,"duration_ms":19342,"significance":"If the photometric selection purity and the temporal associations can be substantiated, the work would supply a practical, scalable route to CL-AGN discovery that complements expensive spectroscopic monitoring, and would add empirical support for accretion-rate changes (rather than pure obscuration) as a driver of type transitions. The 7/12 confirmation rate is potentially interesting. However, the materials supplied for review do not contain the actual CL-AGN manuscript: the full-text body is an unrelated multi-behavior recommendation paper (GCIB). Consequently the claimed efficiency, control-sample comparisons, light-curve statistics, and flare–turn-on associations cannot be audited, and the scientific significance of the result cannot be established from the present submission package.","major_comments":[{"comment":"The full manuscript text provided under paper_id 2605.25689 is not the CL-AGN paper described by the title and abstract; it is an unrelated work on graph contrastive information bottleneck for multi-behavior recommendation (arXiv:2605.25690). Without the correct Methods, selection cuts, light curves, spectra, control samples, and statistical tests, the central claims (7/12 efficiency, superiority of extreme CM variability, and the 3–7 yr flare–turn-on association) cannot be evaluated. This is a load-bearing failure of the review package.","section":null},{"comment":"Even restricting attention to the abstract, the free parameters that define the selection (threshold on CM slope k, optical and MIR amplitude cuts, optical Δm > 0.9, and the 3–7 yr temporal window) are not quantified, nor are false-positive rates or comparisons against ordinary AGN variability and host contamination. The assertion that extreme CM variability is a “highly efficient criterion” therefore rests on an uninspectable selection function and cannot be distinguished from selection artifacts.","section":null},{"comment":"The causal interpretation that flare-like brightenings within 3–7 years “trace short-timescale accretion enhancement, central brightening, and BLR re-illumination” requires a statistical assessment of chance coincidence in a variable population and a clear definition of what constitutes a “flare-like” episode. Neither is available in the supplied materials; the “pivotal-state” framing is therefore currently unsupported.","section":null}],"minor_comments":[],"recommendation":"uncertain","confidential_remarks":"The cache/submission package is corrupted: title, abstract and paper_id point to an astro-ph.GA CL-AGN paper, while the body is a cs.IR recommender-systems manuscript. I cannot produce a content-level accept/reject decision on 2605.25689 until the correct full text is supplied. Recommend that the editorial office verify the PDF/source before any further review cycle."},"author_rebuttal":null,"desk_editor":{"model":"grok-4.5","letter":"The punchline is simple: we only have the abstract for the CL-AGN paper, and the full-text cache is an unrelated multi-behavior recommendation manuscript (GCIB). So this is not a real audit of methods or data.\n\nWhat the abstract actually claims is useful and concrete. They take Type-2 SDSS AGNs, apply a colour–magnitude slope cut plus optical/MIR amplitude cuts (optical Δm > 0.9), get 12 candidates, and spectroscopically confirm 7 turn-on CL-AGNs with DOT and HCT. They also note that four of them show flare-like brightenings within 3–7 years of the spectroscopic change and float a “pivotal-state / multi-year accretion enhancement” picture. A 7/12 hit rate, if it survives proper controls, is a practical photometric filter for a community that still relies heavily on expensive spectroscopic re-visits. That is real incremental value inside AGN time-domain work.\n\nThe soft spots are exactly the ones the stress-test flags, and they are load-bearing because the full text is missing. We cannot see the numerical thresholds on k, the control samples against ordinary AGN variability or host contamination, the false-positive accounting, or the light-curve statistics that would make the 3–7 yr flare association more than temporal proximity. Mild circularity risk also exists if the same variability features used for selection are then listed as distinctive properties of the confirmed class. None of that is fatal on its face; it is simply unverifiable from the material we have.\n\nWho this is for: people already working on CL-AGN selection and accretion-state changes. They will want the light curves, spectra, and comparison tables. It is not paradigm-shifting black-hole physics, and novelty is modest (continuation of their own CM program). Still, a clean photometric route with a reported high confirmation rate is worth a serious referee’s time once the correct manuscript is in hand.\n\nRecommendation: send to peer review when the real full text is available; do not desk-reject on the abstract alone. Until then I would not cite it or put it in reading group.","headline":"Abstract-only CL-AGN selection paper with a 7/12 confirmation rate; the cached full text is the wrong paper, so purity and flare causality cannot be checked.","tokens_in":10480,"tokens_out":531,"would_cite":false,"duration_ms":5977,"reading_group":"no","serious_thinker":"unclear","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"grok-4.5","headline":"Extreme color-magnitude swings flag changing-look AGNs with high efficiency, pointing to multi-year accretion boosts.","keywords":["changing-look AGNs","color-magnitude variability","bluer-when-brighter","accretion enhancement","Type-2 AGNs","mid-infrared variability","photometric selection"],"falsifier":"Spectroscopic monitoring of a larger, uniformly selected sample of extreme-CM AGNs that fails to recover a high confirmation rate of CL transitions, or that shows no statistical excess of flares within a few years of the spectral change relative to control AGNs of similar luminosity and variability.","tokens_in":10436,"feed_emoji":"🌌","tokens_out":645,"duration_ms":5756,"temperature":0.7,"pith_summary":"Changing-look active galactic nuclei (CL-AGNs) switch spectral type and challenge the simple unified model of how supermassive black holes are fed and obscured. The paper argues that photometric color-magnitude (CM) variability—specifically a steep bluer-when-brighter slope together with large optical and mid-infrared amplitudes—offers an efficient way to find them without waiting for repeated spectroscopy. From Sloan Digital Sky Survey Type-2 AGNs the authors selected twelve candidates that showed optical magnitude changes greater than 0.9 and confirmed seven as turn-on CL-AGNs with new spectra. These objects stand out from ordinary AGNs by larger variability and steeper CM slopes, and for four of them a flare-like brightening occurred only a few years before the spectral transition. The authors conclude that extreme CM variability marks AGNs in a pivotal, accretion-enhanced state on timescales of several years, and that the photometric criterion is highly efficient for catching such transitions.","feed_headline":"Extreme color swings flag changing-look AGNs","feed_subtitle":"Seven of twelve photometric candidates confirmed; flares may mark multi-year accretion boosts","key_machinery":"The color-magnitude variability method: the slope k of CM variations is used to isolate strong bluer-when-brighter behavior, combined with optical and mid-infrared variation amplitudes, to pre-select CL candidates for spectroscopic follow-up.","core_discovery":"Extreme color-magnitude variability (strong bluer-when-brighter slope k plus large optical and mid-infrared amplitudes, with optical magnitude changes greater than 0.9) is a highly efficient photometric criterion for identifying changing-look AGNs: seven of twelve Type-2 SDSS candidates selected this way were spectroscopically confirmed as turn-on CL-AGNs, and the class appears to mark AGNs at a pivotal, accretion-enhanced state.","pith_inferences":[],"forward_implications":[],"fun_headline_variants":["Extreme CM swings flag turn-on CL-AGNs","Strong bluer-when-brighter slopes select CL-AGNs","Large optical-MIR amplitudes confirm seven CL-AGNs","CM extremes with flares mark multi-year accretion boosts","Photometric color-magnitude variability finds pivotal CL-AGNs"],"cache_read_input_tokens":128,"weakest_assumption_plain":"That the chosen CM slope and amplitude cuts cleanly isolate true CL transitions rather than ordinary AGN variability or selection artifacts, and that flares a few years earlier are causally linked to the turn-on rather than chance coincidence.","fun_headline_variants_meta":{"raw":{"variants":["Extreme CM swings flag turn-on CL-AGNs","Strong bluer-when-brighter slopes select CL-AGNs","Large optical-MIR amplitudes confirm seven CL-AGNs","CM extremes with flares mark multi-year accretion boosts","Photometric color-magnitude variability finds pivotal CL-AGNs"]},"model":"grok-4.5","effort":"low","cost_usd":0.008772,"raw_usage":{"total_tokens":2098,"prompt_tokens":906,"num_sources_used":0,"completion_tokens":87,"cost_in_usd_ticks":87720000,"prompt_tokens_details":{"text_tokens":906,"audio_tokens":0,"image_tokens":0,"cached_tokens":128},"completion_tokens_details":{"audio_tokens":0,"reasoning_tokens":1105,"accepted_prediction_tokens":0,"rejected_prediction_tokens":0}},"tokens_in":906,"tokens_out":87,"duration_ms":9344,"temperature":1.0,"reasoning_tokens":1105,"cache_read_input_tokens":128,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-07-14T18:42:43.691391+00:00","model_set":{"reader":"grok-4.5"},"falsifier":"Spectroscopic monitoring of a larger, uniformly selected sample of extreme-CM AGNs that fails to recover a high confirmation rate of CL transitions, or that shows no statistical excess of flares within a few years of the spectral change relative to control AGNs of similar luminosity and variability.","supporting_citations":[],"review_version":2}