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"23093 results found.
- GRB 080122 : Suzaku WAM observation of the prompt emission
- SNe 2008D and 2007uy: Chandra Detections
- Two non-burst Swift SubThreshold triggers
- Transient 080109/SN 2008D: Spectroscopic Evolution and Re-Classification
- IPN triangulation of GRB080122
- GRB 080121: Swift-BAT detection of a very weak, short burst
- X-ray transient in NGC 2770: RTT150 optical observations
- GRB 080123, Swift-BAT refined analysis
- GRB 080123: Swift detection of a short burst
- GRB 080120: GROND confirmation of the optical afterglow
- GRB 080120: a long GRB detected by INTEGRAL
- Transient in NGC2770 / SN2008D: Metallicity of nearby HII regions
- Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
- XRF 080109 / SN 2008D: spectroscopic evolution
- XRF 080109/SN 2008D: PROMPT Optical Imaging
- Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
- XRF 080109 in NGC2770: NIR observations at TNG
- XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
- Detailed Spectroscopic ID of SN 2008D (Transient in NGC 2770)
- XRF in NGC 2770: Search for X-ray periodicity
- Spectroscopic classification of SN 2008D (Transient in NGC 2770)
- Opticall follow-ups for the X-ray transient in NGC 2770
- Optical Spectroscopy of the Transient in NGC 2770
- Early OT detection of XRF in NGC 2770 in Asiago frames
- Bright X-ray transient / possible XRF in NGC 2770: TNG R imaging
- Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
- GRB 071227: Suzaku WAM observation of the prompt emission
- Further Swift-BAT analysis of GRB 071227
- Konus-Wind observation of GRB 071227
- GRB 071227: Magellan redshift confirmation
- GRB 071227: Magellan observations
- Swift-BAT refined analysis of short GRB 071227
- GRB 071227: Swift detection of a burst
- GRB 070429B: Possible UVOT Detection of an Optical Afterglow
- GRB 071208?: Swift detection of a possible burst
- GRB 071125: Suzaku WAM observation of the prompt emission
- GRB 070429B: Probable host galaxy and redshift
- GRB 071129, Swift-BAT refined analysis
- GRB 071129: Swift detection of a burst
- Konus-Wind and Konus-A observations of GRB 071125
- IPN triangulation of very bright GRB 071125
- GRB071122: Swift/UVOT Observations
- GRB071104: NIR Afterglow Candidate at TNG
- GRB 071122: MASTER optical observation
- GRB 071122, Swift-BAT refined analysis
- GRB 071122 Swift-XRT refined analysis
- GRB 071122: Swift detection of a burst
- GRB071118 MITSuME OAO optical observation
- Swift/UVOT observations of GRB071118
- Konus-Wind and Konus-A observations of GRB 071117
- GRB 071118, Swift-BAT refined analysis
- GRB 071117: TAROT La Silla observatory optical observations
- GRB 071118: Swift detection of a burst
- GRB 071117, Swift-BAT refined analysis
- GRB 071117: Swift detection of a bright burst
- Swift detection of MXB 0656-072
- GRB 071112C: Optical and NIR data observed with KANATA
- GRB071112C: Errata of MITSuME Ic band photometry
- GRB 071112C: emission lines and refined VLT redshift
- GRB 071112B: 2nd epoch of Magellan i-band imaging
- GRB 071112C : Second Epoch Lulin R-band observations
- GRB071112C MITSuME Okayama Optical Observation
- GRB 071112C: Swift-BAT refined analysis
- GRB 071112C: Swift XRT refined analysis
- Swift UVOT upper limits of GRB071112B
- GRB 071112C: VLT redshift
- GRB 071112B: Swift-XRT preliminary analysis
- GRB 071112B, Swift-BAT partial refined analysis of the SHB
- GRB 071112C : Lulin R-band observation
- GRB 071112C: RTT150 optical observations
- GRB 071112C: TAROT Calern observatory optical observations
- GRB071112C Xinglong_TNT_and_EST_afterglow observations
- GRB 071112C: Optical and NIR afterglows observed with KANATA
- GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
- GRB 071112C: Swift detection of a burst with an optical counterpart
- GRB 071112B: Swift detection of a short hard burst
- GRB 071112: Swift detection of a possible burst
- Swift/UVOT initial analysis of GRB071109
- GRB 071109: further Swift-XRT analysis
- GRB 071109: TAROT Calern observatory optical observations
- GRB 071109: Swift-XRT possible X-ray counterpart
- GRB 071109: A long GRB detected by INTEGRAL
- GRB 071104: Gamma Ray Burst Localization by SuperAGILE
- GRB 071101, Swift-BAT refined analysis
- GRB071101: Optical and NIR upper limits by KANATA
- GRB0711101: Two new source from Xinglong TNT observation
- GRB 071101: TAROT Calern observatory optical observations
- GRB071101 LOAO B,V,R,I observation
- GRB 071101: Swift detection of a burst
- GRB 071031, Swift-BAT refined analysis
- GRB 071031: Swift/UVOT detection of afterglow
- GRB 071031: Swift-XRT Team refined analysis
- GRB 071020: MITSuME Akeno optical observations
- GRB071031: Rapid PROMPT Detections
- GRB 071031: Swift detection of a burst with an optical counterpart
- GRB071028: Xinglong EST V-band upper limit
- GRB 071028, Swift-BAT refined analysis
- GRB 071028: Swift detection of a burst
- GRB 071003: Infrared Photometry with Keck Adaptive Optics
- GRB071021: MARGE Optical Limits