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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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').
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"

2445 results found.

  1. LIGO/Virgo S190828j : No significant candidates in TAROT-GRANDMA observations
  2. Fermi trigger No 581645543 Global MASTER-Net observations report
  3. GRB 181203A: Swift/UVOT Upper Limits
  4. LIGO/Virgo G298048: Effelsberg 100-m Radio Telescope observations of SSS17a
  5. LIGO/Virgo G275697: Further Swift-XRT sources
  6. GRB 170208A: Swift/UVOT Upper Limits
  7. GRB 161219B: Swift/UVOT Detection
  8. GRB 160521B: Swift/UVOT Upper Limits
  9. GRB 160412A: Swift/UVOT Upper Limits
  10. GRB 150720A: Swift/UVOT Upper Limits
  11. GRB 150626A: Swift/UVOT Upper Limits
  12. GRB 150615A: Swift/UVOT Detection
  13. GRB 150301B: X-shooter spectroscopy
  14. GRB 150101A: Swift/UVOT Upper Limits
  15. GRB 140829A: Fermi GBM Detection
  16. GRB 140219A: MASTER before and after GRB observational arguments of the exceptionally Dark GRB
  17. GRB 120514A: Swift/UVOT Upper Limits
  18. GRB 120324A: Swift/UVOT Upper Limits
  19. GRB 120211A: Swift/UVOT Upper Limits
  20. GRB 120118B: Swift/UVOT Upper Limits
  21. GRB 120116A: Swift/UVOT Upper Limits
  22. GRB 111211A: Detection of the SN with the 10.4m GTC
  23. GRB 100901A: MASTER optical flare at 420s discovery
  24. GRB 100816A: MASTER Optical Limits
  25. GRB 090407: Swift UVOT Upper Limits
  26. GRB 081226B: Fermi GBM observation
  27. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  28. GRB 071112C: Optical and NIR data observed with KANATA
  29. GRB 071010B: Keck/LRIS Spectroscopy
  30. Swift/UVOT Observations of GRB070707
  31. Konus-Wind observation of GRB 061222A
  32. GRB 060403: Refined analysis of the Swift-BAT burst
  33. GRB 060218/SN 2006aj, high resolution spectra
  34. GRB 051111: Further spectroscopic analysis
  35. GRB050915: Swift/UVOT upper limits
  36. GRB 050721A: Early Swift XRT analysis results
  37. GRB 050509B: WSRT Radio Observations
  38. Type Ic SN2003L (SN/GRB?), optical spectrum
  39. SN2002ap (SN/GRB?) Echelle spectra
  40. GRB 001109 X-ray afterglow with BeppoSAX
  41. GRB000418, UBVRI field photometry update
  42. GRB 000418, UBVRI field photometry
  43. Late-time HST/STIS Observations of GRB 990510
  44. Late Afterglows of GRBs 990510, 990123
  45. IRAS 18119-1342 and the possible new SGR

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