GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"
20117 results found.
- GRB060526, optical observations
- GRB 051227 : WIDGET simultaneous optical observations
- GRB 051028 : WIDGET pre-trigger limit
- GRB060526: Optical counterpart from MIRO
- GRB 060526: RTT150 optical observations
- GRB060526: optical observations
- GRB 060526: SMARTS optical/IR afterglow observations
- GRB 060526: REM observations
- GRB 060526: RTT150 optical observations, afterglow flattening
- GRB 060526: Refined analysis of the Swift-BAT burst
- GRB 060526: RTT150 optical observations
- GRB060526, optical observations
- GRB 060526: Watcher Observations
- GRB060526 - SDSS Pre-burst Observations
- GRB 060526: Swift detection of a burst with x-ray and optical afterglow
- GRB 060413 : WIDGET simultaneous optical observations
- XMM-Newton observation of GRB060510b
- GRB060512: Late-Time P200 Observations
- GRB 060522: Swift-BAT Refined Analysis
- GRB 060522: REM NIR observations
- GRB 060522: TNG optical observations
- GRB 060522: Swift detection of a burst with possible optical afterglow
- GRB 060515: NIR observation
- GRB060515: P200 NIR Observations
- GRB 060515 BAT refined analysis
- GRB 060512: TAROT optical observation
- GRB 060515: Swift/UVOT Upper Limits
- GRB 060515: Swift/XRT position
- GRB 060515: Super-LOTIS Observations
- GRB 060515: TAROT optical observation
- GRB 060515: ROTSE-III Optical Limits
- GRB 060515: Swift detection of a burst
- GRB 060512: Subaru NIR observation
- GRB060512: Swift XRT Team refined analysis
- GRB 060512: 1.54m Kuiper Observations
- GRB 060512: Detection of NIR afterglow
- GRB 060512: P60 Observations
- GRB 060512: REM NIR observations
- GRB060512 - SDSS Pre-Burst Observations
- GRB 060512: Swift detection of a burst with an optical afterglow
- GRB 060505: X-ray afterglow - Correction -
- GRB 060505: X-ray afterglow
- Konus-Wind observation of GRB 060510A
- GRB060418: optical observations
- GRB060510 - SDSS Pre-Burst Observations
- GRB 060510B: Super-LOTIS Observations
- GRB 060510B: Swift detection of a burst
- GRB 060510: Swift detection of a burst with optical transient
- GRB060507: optical afterglow detection
- GRB060502B: improvement in the XRT afterglow position
- GRB 060507: Swift-BAT Refined Analysis
- GRB 060505: PROMPT Observations
- GRB 060507: Swift/UVOT Upper Limits
- GRB 060507: Swift XRT Team Refined Analysis
- GRB 060429: Suzaku WAM observation
- GRB060505: Swift/UVOT Observations
- GRB060425: new MASTER survey method
- GRB 060505: Swift XRT afterglow canditate position
- GRB 060502b: Second epoch Gemini observations
- GRB 060428B: spectroscopy
- GRB 060502B: optical observations
- GRB 060502B: AROMA refined photometric calibration
- GRB 060502B MDM Follow-up Observation
- GRB 060502b: Gemini imaging and spectroscopy
- GRB060502A, optical observation
- GRB 060502B: Swift/UVOT upper limits
- GRB 060502A: Swift/UVOT source detection
- GRB 060429: Refined IPN error box and Konus-Wind spectrum
- GRB060502B: Swift XRT Team refined analysis
- GRB 060501: P60 Observations and Candidate Retraction
- GRB 060502B: Xinglong optical observation
- GRB 060502B: MASTER optical observations
- GRB 060502: Swift-BAT refined analysis
- GRB060501: Swift UVOT followup observations
- GRB060502: Super-LOTIS Observations
- GRB 060502: P60 Afterglow Confirmation
- GRB 060502: Swift detection of a burst with an optical counterpart
- GRB060501: P60 imaging and afterglow candidate
- GRB 060501: Swift detection of a burst
- Konus-Wind observation of GRB 060427B
- GRB060428B - SDSS Pre-Burst Observations
- GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
- GRB060428B: Swift XRT Team refined analysis
- GRB 060427B: IPN localization of a short hard burst
- GRB 060428B: Xinglong I-band limit
- GRB 051117A: Bright host galaxy not confirmed
- GRB060428A: Swift/UVOT observations.
- GRB060428B, optical observation
- GRB 060428A: Refined analysis of the Swift-BAT burst
- GRB 060428b : Kiso R-band limit
- GRB 060428b: Optical afterglow candidate
- GRB 060428B: Swift detection of a burst
- GRB 060427: NIR observations
- GRB060427: Xinglong optical Observations
- GRB 060428: Swift detection of a burst
- GRB 060427: Swift/UVOT upper limits.
- GRB 060427: Refined analysis of the Swift-BAT burst
- GRB 060427, optical observation
- GRB 060427: Swift detection of a burst
- GRB 060425: IPN localization and KW spectrum of a short, hard burst