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').
18174 results found.
- GRB 050402: Early observations with Swift-UVOT
- Swift Trigger 113225: P60 Observations
- GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
- GRB 050401: Optical afterglow candidate
- Swift-BAT detection of GRB 050401
- GRB 050401: Prompt XRT position
- Retraction of three Swift GRB triggers
- Swift-BAT detection of GRB 050331b
- GRB 050331: Swift UVOT Source
- Swift-BAT detection of GRB 050331
- GRB 050331: Swift XRT Position
- Swift Data Publicly Available Starting April 5, 2005
- Konus-Wind observation of GRB 050326
- GRB050326: optical limit
- GRB 050326: Early observations with Swift-UVOT
- GRB 050326 XMM-Newton observation
- GRB 050326 : Planned XMM-Newton observation
- GRB 050326: Swift XRT Position
- GRB050326: optical limit 33min before GRB
- GRB 050326 BAT refined analysis
- GRB050326: delayed XRT observation
- Swift-BAT detection of a bright GRB 050326
- GRB050319, optical observations
- GRB050319, color indices
- GRB050319: RTT150 Optical Observations
- Swift-BAT detection of a bright outburst from SGR1806-20
- Swift-BAT trigger 112060 is not a real GRB
- GRB 050319: ROTSE-III Refined Analysis
- GRB 050318: Swift-BAT refined analysis
- Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
- GRB 050319 R band observations
- GRB 050319: Swift-UVOT detection of the afterglow
- GRB 050315: Variability Analysis of Swift BAT Time History
- GRB050319: BR optical photometry
- GRB 050318: SWIFT-UVOT refined analysis
- GRB 050319: Swift-BAT refined analysis
- GRB050319,optical observation
- Swift Detection of GRB 050319
- GRB 050319: Detection of Possible Optical Counterpart
- GRB 050318: Swift/UVOT detection of afterglow emission
- GRB050318: Swift XRT position
- Swift-BAT detection of GRB 050318
- GRB050223: analysis of the XMM-Newton observation
- GRB 050306: ROTSE-III early limits
- GRB 050315: Swift-BAT further refined analysis
- GRB050315: Swift-BAT Refined analysis
- Non-detection of GRB050315 in ATCA Radio Observations
- GRB 050315: Swift XRT Position
- GRB 050315: Early Observations with Swift/UVOT
- Swift-BAT detection of GRB 050315
- GRB050223: No XMM-Newton OM detection of afterglow emission
- GRB050309: CONCAM pre-trigger and trigger coincident optical
- GRB 050126: Redshift determination
- Swift-BAT trigger 107873: No Swift XRT counterpart
- GRB 050306: Confirmation of X-ray afterglow
- GRB 050309, Early optical limits from RAPTOR
- Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
- GRB 050309 : Lulin R-band observation
- Swift 107873: P60 Optical Observations
- GRB 050306: CORRECTION to date of observation
- GRB 050306: No Swift UVOT Optical Counterpart Detected
- GRB 050306: Possible X-ray Afterglow Position from the Swift
- Swift trigger 107518: optical observation
- GRB 050306,optical observation
- GRB 050306: Swift-BAT detection of a long burst
- GRB050215B: Late-Time Swift UVOT Observations
- PROMPT VRcIc Observations of GRB 050223
- GRB 050223: optical observations
- GRB050223 XMM-Newton observation
- INTEGRAL detection of GRB 050223
- GRB050223: No Swift UVOT Detection of Afterglow Emission
- GRB050223: ROTSE-III Optical Observations
- GRB 050223 Swift/BAT detection of a burst
- GRB 050223: Swift XRT Position
- GRB050219b: CORRECTION to time of UVOT observations
- GRB050219b: No Swift UVOT Detection of Afterglow Emission
- GRB 050219b: CORRECTION to refined XRT position
- GRB050219b: No Swift UVOT Detection of Afterglow Emission
- GRB 050219b: Refined XRT position
- GRB 050219b: Swift-BAT detection of a burst
- GRB 050219b: CORRECTION: Swift XRT Position
- GRB 050219b: Swift XRT Position
- GRB 050219a, optical observations
- GRB 050219a: Refined XRT position
- GRB050219a: No Swift UVOT Detection of Afterglow Emission
- GRB 050219: Swift-BAT detection of a burst
- GRB050215b: Swift UVOT Detection of Afterglow Emission
- GRB 050219: Prompt X-ray position
- GRB 050215b: XRT confirmation of IR afterglow candidate
- GRB050215b: P60 Optical Observations
- GRB 050215b: Swift XRT Source Variability
- GRB 050215B: candidate afterglow
- GRB 050215b : Lulin follow-up observation
- GRB 050215b, BOOTES-2 simultaneous optical observations
- GRB 050215B: UKIRT K-band imaging
- GRB 050215b: Swift XRT Observations
- GRB050215b: No Swift UVOT Detection of Afterglow Emission
- GRB050215a: No Swift UVOT Detection of Afterglow Emission
- Swift-BAT detects two bursts: GRB050215a and GRB050215b
- GRB050215B: ROTSE-III optical observations