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"
20120 results found.
- GRB060218: Radio Afterglow Discovery
- GRB060219: SDSS pre-burst observations
- GRB 060219: Swift-BAT detection of a weak burst
- Oddball GRB 060218, transient or GRB?
- Brightening of the Optical Counterpart of the Possible GRB 060218
- GRB 060218: Pre-burst detection of a possible host galaxy
- GRB 060218A: ROTSE-III Possible Optical Flare
- GRB 060211B: Swift/UVOT Upper Limits
- GRB060218 : SDSS pre-burst observations
- GRB 060218: Swift XRT Position
- GRB 060213: optical afterglow not confirmed
- Swift UVOT observations of GRB060213
- GRB060213: Swift XRT observations and possible afterglow candidate
- Konus-Wind observation of bright hard GRB 060213
- GRB 060213: IPN localization
- GRB060211B: REM optical and NIR observations
- GRB 060211A: Further refined analysis of the Swift burst
- GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
- GRB 060211b: P60 Observations
- GRB 060211B: Swift/BAT refined analysis
- GRB060210: Swift/UVOT Upper Limits
- GRB 060210: Optical Observations
- GRB 060211: ROTSE-III Optical Limits
- GRB 060211: Swift detection of a long burst
- GRB060210: Optical Observations
- GRB060210: Early Optical Observations
- GRB 060210: optical evolution
- GRB 060210: Swift detection of a burst
- GRB060210: Optical afterglow
- GRB 060209 : TAROT optical observation
- GRB 060203: Swift/UVOT upper limits
- GRB 060206: TTT Observations
- GRB 060121 : WIDGET Pre-trigger limit
- GRB060204a: Swift XRT Source is not GRB Afterglow
- Orphan GRB Afterglow candidate
- GRB 060206: IR Detection of the Afterglow
- GRB 060204A: ROSAT Pointing
- GRB 060206: Super-LOTIS observations
- GRB060204A: Swift/UVOT observations
- GRB060206: SDSS Pre-Burst Observations
- GRB 060206: High redshift burst
- GRB060204a: Swift XRT Detection of an Afterglow Candidate
- GRB060206 - Swift UVOT Confirmation of Optical Afterglow
- GRB060206: Optical afterglow
- GRB 060204C: XRT analysis of Swift J061223.0+701243.9
- GRB060203: WHT Z-band observations
- BAT GRB 060204C is probably not a GRB
- GRB060204C: optical observation
- GRB 060204A: Swift XRT upper limit
- GRB 060204A: FRAM optical observations
- GRB060204B: Swift/UVOT refined analysis
- GRB 060204C: optical observations
- Swift XRT Observation of GRB 060204C
- GRB 060204B: Swift-BAT refined analysis
- GRB 060204B: ART early limit
- GRB 060204b: Keck/LRIS Afterglow Confirmation
- GRB 060204C: Liverpool Telescopes optical limit
- GRB 060204C: ROTSE-III Optical Limits
- GRB 060204C: Swift-BAT detection of a burst
- GRB060204B, optical observation
- GRB060204B - SDSS pre-burst observations
- GRB 060204B: Swift detection of a burst
- GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
- GRB 060203: RTT150 optical observations
- Swift-BAT trigger is GRB 060203
- GRB 060203: IR Counterpart
- GRB060203: Observations with SARA
- GRB 060203: P60 Confirmation of Optical Afterglow
- Possible GRB 060203: optical observations at Asiago
- GRB 060202: Gemini-N J, H, K_s observations
- GRB 060202: Near-IR Observation with UKIRT/WFCAM
- GRB 060202: Optical Afterglow Candidate from Keck/LRIS
- GRB060202, optical observation
- GRB 060202: Swift/UVOT upper limits
- GRB 060202: Swift detection of a burst
- GRB 060121: Gemini Late-time Observations
- GRB 060130: PROMPT Observations
- GRB060130: Further R-band imaging
- GRB 060130: Swift/XRT observation
- GRB060130: Optical imaging
- GRB060130: REM infrared observations
- GRB 060130, SMARTS optical observations
- GRB 060130: FRAM optical observations
- GRB 060121: Confirmation of NIR Afterglow
- GRB 060123: Swift refined analysis of an unusual GRB
- GRB060124, BVRcIc field calibration
- GRB060105: refined analysis of the Suzaku observation
- GRB 060121: Probable Detection of NIR Afterglow
- GRB 060116 HST observations
- Konus-Wind observation of GRB 060124
- GRB 060124: ART optical limits during the burst
- GRB060123: Optical and IR Imaging
- GRB 060123: P200 Observations
- GRB 060124: R band Observations
- GRB 060124 : Optical observation at Xinglong and Kiso
- GRB060123: SDSS pre-burst observations
- GRB 060123: Swift detection of a very long, faint burst
- GRB 060121: OHP optical limits
- GRB 060124: TAROT optical limits
- GRB060124, optical observation