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').
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"12113 results found.
- GRB 060927: Swift detection of a burst
- GRB060923C: AROMA optical obsevation
- GRB 060923, Swift-BAT refined analysis
- Swift detection of IGR J17497-2821 (trigger 230504)
- Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
- GRB 060919: Swift detection of a burst
- Konus-Wind observation of GRB 060912
- GRB060912: Swift/UVOT Observations
- GRB 060912B: a long GRB detected with INTEGRAL
- GRB 060912: Swift XRT Team Refined Analysis
- GRB 060912: Swift detection of a burst with an optical afterglow
- GRB 060908, Swift/XRT refined analysis
- GRB 060908: Swift/UVOT Observations
- GRB 060904A : Optical limit
- GRB 060908: REM optical prompt observation
- GRB 060908: PROMPT Detection of a Bright Counterpart
- GRB 060908: Swift detection of a burst with a bright optical counterpart
- GRB 060906: optical observation
- GRB 060906: observations with FRAM
- GRB 060906: Swift detection of a probable burst
- GRB 060904B: RTT150 optical observations
- Konus-Wind observation of GRB 060904A
- Konus-Wind observation of GRB 060901
- GRB 060901: further INTEGRAL results
- GRB 060901: Watcher observations
- GRB 060901: a long GRB detected by INTEGRAL
- Two bright bursts from SGR 1806-20 detected with IBAS
- GRB 060605: VLA Observation
- GRB 060707: VLA observation
- GRB 060826(?): Swift detection of a possible burst
- GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
- GRB 060813: A long, bright GRB detected with Suzaku WAM
- Konus-Wind observation of GRB 060814
- GRB 060814: source inside revised XRT error box
- GRB 060814: Possible IR counterpart
- GRB 060814: Swift XRT refined analysis
- GRB 060814 - SDSS Pre-Burst Observations
- Konus-Wind observation of GRB 060813
- Image of the dust-scattering halo around SGR 1806-20
- Second VLA limit on new radio point source in SGR 1806-20
- A dust-scattering halo detected around SGR 1806-20
- Swift detection of an outburst from the 4U 1246-58 LMXB burster
- GRB060807: Optical limiting magnitudes
- VLA Upper Limit on Outburst of SGR 1806-20
- GRB060806 is similar to previous activity of SGR1806-20
- GRB060806 = SGR1806-20
- GRB 060805B: RHESSI Spectral Fit
- GRB060807: optical upper limit in white light
- IPN triangulation of GRB060806 (long, exceptionally bright)
- IPN triangulation of GRB060805B
- GRB 060805: KAIT observations
- GRB060801: optical upper limit in R
- GRB060729: ROTSE-III Observations of the Slow Optical Decay
- GRB 060729: Refined analysis of the Swift-BAT burst
- GRB 060729: Swift detection of a burst with an UVOT optical counterpart
- GRB 060719: optical limit by Pi-of-the-Sky
- GRB 060719: LCO optical observations
- GRB 060714: Refined analysis of the Swift-BAT burst
- GRB 060714: Swift detection of a burst with an UVOT optical afterglow
- GRB 060605: SkyNet Optical Limits
- GRB 060707: BOOTES-IR optical observation
- GRB 060707: Swift detection of a burst
- Konus-Wind observation of GRB 060614
- GRB060614: SSO 1m observations
- GRB060614: Watcher observation
- BAT Trigger #214277 is SGR 1900+14
- GRB 060610: KAIT observations
- GRB 060607: Swift detection of a burst with bright optical counterpart
- GRB 060522: PROMPT Optical Limits
- GRB 060605: RTT150 optical observations
- GRB 060605: Swift detection of a burst with optical counterpart
- GRB060604: Swift/UVOT detections
- GRB 060604A: ROTSE-III Optical Limits
- GRB 060604: Swift detection of a burst with possible optical counterpart
- GRB 060526: Tautenburg Second Epoch Observations
- GRB 060602B: Swift detection of a burst
- GRB 060526: RTT150 optical observations
- GRB060526: optical observations
- GRB 060526: Swift/XRT Team refined analysis
- GRB 060522: Swift/UVOT Observations of the Optical Afterglow
- XMM-Newton observation of GRB060510b
- GRB 060522: Swift/XRT Team refined analysis
- GRB 060522: Swift-BAT Refined Analysis
- GRB 060516: Refined analysis of the Swift-BAT burst
- GRB 060515: ROTSE-III Optical Limits
- GRB 060512: Detection of NIR afterglow
- GRB060512 Name Correction: LT Afterglow detection
- GRB060512: Liverpool Telescope Afterglow detection
- GRB 060512: Swift detection of a burst with an optical afterglow
- GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
- Konus-Wind observation of GRB 060510A
- GRB 060428a, SMARTS optical/IR afterglow detection
- GRB 060429: Suzaku WAM observation
- GRB060505: Swift/UVOT Observations
- GRB 060505: Swift XRT afterglow canditate position
- GRB 060502B: optical observations
- GRB 060502B: AROMA refined photometric calibration
- GRB 060429: Refined IPN error box and Konus-Wind spectrum
- GRB 060502B: AROMA optical observations
- GRB 060502B: Refined analysis of the Swift-BAT short burst