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.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
62 results found.
- GRB 231214A: Swift-XRT refined Analysis
- LIGO/Virgo/KAGRA S231114n: Updated Sky localization
- Fermi GRB 220330A: Global MASTER-Net observations report
- GRB 210905A: Swift/UVOT Upper Limits
- Fermi trigger No 645857659: Global MASTER-Net observations report
- GRB 210104A: AstroSat CZTI detection
- GRB 190919B: GROND detection of the NIR afterglow
- Fermi GRB190508.81 Global MASTER-Net observations report
- Konus-Wind observation of GRB 180703A
- GRB 180402A: Swift/UVOT Upper Limits
- Trigger 813449: Swift detection of large burst from XTE J1701-407
- GRB 171102B: Swift/UVOT Upper Limits
- GRB 160629A: TAROT Calern observatory optical detection
- Swift-BAT trigger 686845 was due to noise near a known source
- GRB 160506A: Swift/UVOT Upper Limits
- GRB 160314A: Swift/UVOT Detection
- GRB 160127A: TAROT La Silla observatory optical light curve
- Swift trigger 637807 is probably not an astrophysical source
- GRB 150317A: Swift/UVOT Upper Limits
- Konus-Wind observation of GRB 141229A
- GRB 140930B: Swift/UVOT Upper Limits
- Trigger 538084: Swift detection of XTE J1739-302
- GRB 111215A: Swift-XRT refined Analysis
- Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
- GRB 110709A: Suzaku WAM observation of the prompt emission
- GRB 101213A: Swift-XRT refined Analysis
- IBAS Alert n. 6057 is not due to a GRB
- Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
- IBAS Alert 5992 is not a GRB, but XTE J1855-026
- Swift/BAT Detects an Outburst from XTE J1901+014
- Swift Trigger #382159 is due to XTE J1752-223
- Swift-BAT trigger 373691 is a galactic bulge transient
- GRB 091010: RXTE detection
- GRB 090621B: MAGIC telescope GeV observation
- Swift UVOT observations of GRB081028
- Swift detection of XTE J1701-407
- Trigger 317205: Swift detection of an outburst from XTE J1701-407
- GRB080426: Swift/UVOT upper limits
- GRB080319B: Time-Independent XRT Spectrum
- A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
- OT20050728 was not an optical GRB afterglow
- An interactive program for GRB pseudo-redshift computations
- IPN observations of SGR1806-20
- Correction to GCN Circ 3476 on GRB050525A
- H11603: An X-ray flare from V4641 Sgr, or a possible XRF
- Subject : GRB 050525: pseudo-redshift
- GRB 031026 (=H2882): Evidence for High Redshift from Prompt
- SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
- IPN detection of continued activity from SGR1806-20
- XRF 030824: observations at CFHT
- RXTE PCA Observations of SGR1806-20 Region
- Detection of activity from SGR 1900+14 with the RXTE/PCA
- RXTE Observations of SGR 1900+14
- The X-ray Flash 011030 ('GRB 011030')
- SGR 1900+14 : RXTE observations
- Further Optical Observations of GRB 010324
- Optical Observations of GRB 010324
- GCN resumes full operations
- Chandra observation of the X-ray afterglow of GRB991216
- GRB 990506: Limits on the possible optical transient
- GRB990308 (Trig. 7457), optical observations
- GRB 980703: BATSE Observations