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').
18175 results found.
- Swift-BAT detection of GRB050505
- GRB 050504: Swift XRT position
- Swift UVOT observation of GRB 050504
- GRB 050502b, V band Observations
- GRB050502B Swift-BAT refined analysis
- GRB050502B: I band source in XRT error circle
- Swift UVOT refined analysis
- Retraction of Swift-BAT trigger 116145
- GRB 050502b : optical observation at Lulin observatory
- GRB 050502b: Swift XRT Position
- GRB050502B: Optical Limits from ANU 1m
- Swift Detection of the Bright Burst GRB050502b
- GRB050502: ANU 1m optical Observations
- Swift-BAT Trigger 115881 is not a real GRB
- Swift/BAT possible detection of a weak burst GRB050430
- GRB 050401: Rc observation
- GRB050416a: Radio Detection
- GRB 050422: Swift-UVOT observation
- GRB 050422: Swift-BAT refined analysis
- GRB 050422: Swift XRT Position
- Swift Detection of GRB 050422
- GRB 050421: SLOTIS observations
- GRB050421: Radio Observations
- GRB050421: Radio Observations
- GRB 050421: Swift-UVOT observation
- GRB 050421: Swift-BAT refined analysis
- GRB 050421: ROTSE-III Optical Limits
- GRB 050421: early Swift XRT analysis results
- GRB 050421: BOOTES-2 simultaneous optical observations
- GRB 050421: Optical observations at the INT
- Swift Detection of GRB050421
- GRB 050416b: Tentative Swift XRT Position
- GRB050326: analysis of the XMM-Newton observation
- GRB 050418: Swift-BAT refined analysis
- Swift-BAT detection of the bright and long GRB 050418
- GRB 050416B: optical observations
- GRB 050416b: Swift-BAT refined analysis
- GRB 050416: Swift/UVOT refined analysis
- Swift-BAT detection of GRB 050416b
- GRB050412: Radio Observations
- GRB 050416: Swift/UVOT detection of afterglow emission
- GRB050416: Refined Swift-XRT analysis
- GRB050416: Maidanak optical observations
- GRB 050416: Swift-BAT refined analysis
- GRB 050416,optical observation
- GRB 050416: KAIT observations
- GRB 050416: Swift XRT Position
- GRB 050416: Radio observations
- Confirmation of OT for GRB050416
- GRB050416: P60 Afterglow Candidate
- Swift BAT/XRT Detection of GRB 050416
- GRB 050412: Subaru observations
- GRB 050412: optical limit
- GRB 050412: optical observations
- GRB 050408: refined XRT analysis, no jet break seen yet
- GRB 050412: early Swift XRT analysis results
- GRB 050412: Swift-BAT refined analysis
- GRB 050412: ANU 2.3m observations
- GRB 050412: Early Optical/Ultraviolet Observations with
- GRB 050412: retraction of UVOT transient report
- GRB 050412: UVOT transient not in XRT error circle
- GRB 050412: Swift XRT Position
- GRB050412: optical limit before and during GRB
- GRB050412: ROTSE-III Optical Limits
- Swift-BAT Detection of GRB 050412: A Bright, Long Burst
- GRB 050412: IR Observations
- GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
- GRB 050410, optical observations
- GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
- GRB 050410 R band Optical Observations
- GRB050410 : Null detection report
- GRB 050410, optical observations
- GRB050410: Radio Observations
- GRB 050408: Swift XRT measurement of possible jet break
- GRB050410: MASTER optical observations
- GRB 050410: Early observations with Swift-UVOT
- Swift-BAT detection of GRB 050410
- GRB 050410: Swift XRT Position
- GRB 050408: Properties of the Host Galaxy
- GRB 050408: Swift XRT analysis
- GRB 050408, optical observations
- GRB050408: REM NIR and Optical observation
- GRB 050408 Optical Observations
- GRB 050408: Optical afterglow confirmed
- GRB 050408, optical observations
- GRB 050408 optical candidate
- GRB 050408: Swift XRT Position
- Swift-UVOT Optical Counterpart Candidate to XRF 050406
- GRB 050406: early Swift XRT analysis results
- GRB 050406 BAT refined analysis
- GRB 050406: Early observations with Swift-UVOT
- GRB 050406: Swift XRT Position
- Swift-BAT detection of GRB 050406
- Konus-Wind observation of GRB 050401
- GRB050401: Radio observation at 610 MHz with GMRT
- GRB 050401: VLT spectroscopic redshift
- GRB 050401 Optical Observations
- GRB050401: Maidanak optical observation
- GRB 050401 BAT refined analysis
- Very questionable identity of Swift-BAT GRB050402 (Trig=113225)