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 050525A: Swift Late-Time Decay Rate
- CORRECTION: GRB050603 Swift UVOT Afterglow Observations
- GRB 050416(a): Host Galaxy Redshift Determination
- Swift/UVOT observations of GRB050607
- GRB 050607: RAPTOR-S Early Optical Limits
- GRB050607: KAIT optical limits
- GRB 050607: MDM Observations
- GRB050607,optical observation
- GRB 050607 - XRT refined data analysis
- GRB050607 optical limit by "Pi of the Sky"
- GRB050607: Swift Detection of a long GRB
- GRB 050603 - XRT data analysis of the first day
- Konus-Wind observation of GRB 050603
- GRB 050603: Analysis of UVOT data
- GRB050603: Fading Afterglow observed by Swift UVOT
- GRB 050603: Swift XRT Position
- GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
- Swift/BAT Detection of GRB050603
- GRB 050408: jet break in the XRT light curve
- GRB050528, XRT observations
- Correction to GCN Circ 3502 on GRB 050528
- Swift-BAT GRB 050528: a soft burst
- Update on Swift-BAT GRB 050528 (Trigger 130679)
- Possible GRB050528: no candidate from Liverpool Telescope
- Swift-BAT detection of possible GRB 050528
- GRB 050509b: refined XRT/Chandra afterglow position analysis
- GRB050525a: optical upper limits
- GRB 050525B: Swift-BAT observations
- GRB050525A,optical observation
- GRB050525: Super-LOTIS observations
- GRB 050525, spectral lag pseudo-redshift
- GRB050306: optical afterglow not confirmed
- GRB 050525A: BOOTES simultaneous optical observations
- GRB 050525A: Swift-BAT refined analysis
- Swift/UVOT UV and optical detections of GRB 050525
- Konus-Wind observation of GRB 050525
- GRB 050525: TAROT observations of the early afterglow
- INTEGRAL detection of GRB 050525
- GRB 050525: Optical observation
- GRB050525: ROTSE-III Refined Analysis
- GRB 050525 - Very Bright, Not Short
- GRB 050525: Swift Detection of a Bright, Possibly Short Burst
- GRB 050525A: ROTSE-III Detection of Possible Counterpart
- XRF 050522: Swift XRT refined analysis
- Swift/UVOT observation of XRF 050522
- GRB 050509A: Further I-band imaging
- RBO Observations of GRB050522
- XRF 050522: Swift XRT observation
- GRB 050520: VLT/ULTRACAM observations
- Swift UVOT Observations of GRB 050520
- GRB 050520: Swift XRT refined analysis
- XRF050509C: Chandra Afterglow Detection
- XRF 050509c: Swift XRT Upper Limit
- RBO Observations of GRB050520
- GRB 050520: TAROT optical limit
- GRB 050520: Swift XRT position
- No Swift-BAT Lightcurves in real-time for next 3 weeks
- Swift-BAT trigger 122203 is not a real GRB
- GRB 050504: Swift XRT afterglow candidate has faded
- GRB 050509B: Subaru Optical Observations
- GRB050502b: Early Observation
- Refined Chandra analysis of GRB 050509b
- GRB050509b, SDSS pre-burst observations
- Chandra observation of GRB 050509b
- GRB 050509b: RAPTOR deep, early limits.
- GRB050509B: Optical/Infared observations
- GRB 050509b: Swift/UVOT follow-up measurements
- GRB 050509b Milagro GeV/TeV Observations
- GRB050509B: Optical observations at the Very Large Telescope
- GRB050416: Afterglow detection at 188 nm with Swift UVOT
- GRB 050509a: Swift-BAT refined analysis
- GRB 050509B: WSRT Radio Observations
- GRB 050505: SARA Observations
- Swift UVOT Follow-up Observations of GRB 050509B
- GRB 050509B, Optical Observations
- GRB 050509B: Swift/XRT refined analysis
- GRB050509a: Swift UVOT observations
- GRB 050509b: Optical observations
- GRB 050509b: Possible Optical Counterpart
- GRB 050509A: Optical observations
- GRB 050509b: Swift-BAT refined analysis of the short hard burst
- GRB 050509b: optical observations
- GRB 050509b: Swift XRT Position
- GRB 050509B: ROTSE-III Optical Limits
- Swift Detection of GRB050509b: A short duration burst
- GRB 050509a: Swift XRT Position
- Swift Detection of the Burst GRB050509
- Swift-BAT detection of GRB 050507
- GRB 050505: early time observations
- GRB 050505 - Faulkes Telescope North observations
- GRB 050502a: Swift XRT Upper Limit
- GRB 050505, simultaneous optical observation
- GRB 050505: Further Swift UVOT observations.
- GRB050416A : 1 GHz limit from GMRT
- GRB 050505 UVOT
- GRB 050505: Swift XRT Position
- GRB050505 Swift-BAT refined analysis
- GRB 050416b:Swift XRT afterglow upper limits
- GRB 050416b:Swift XRT afterglow upper limits
- Swift-BAT detection of GRB050505