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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').
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"

20480 results found.

  1. SGR1900+14
  2. SGR1900+14
  3. GRB 980519 Optical Observations
  4. GRB980519 optical observations
  5. GRB980519 I-band observations
  6. GRB 980519
  7. GRB980519 optical observations
  8. GRB 980519 Optical Observations
  9. GRB980519 BATSE Observations
  10. GRB980519 optical observations
  11. GRB980519 Optical Observations
  12. GRB980519 Optical Observations
  13. GRB980519 Optical Observations
  14. GRB 980519 Optical Observations
  15. GRB980519 optical observations
  16. GRB 980425 Radio Light Curve
  17. GRB 980425 Brightness Temperature
  18. BSAX Observations of GRB980425 field
  19. GRB980425 BATSE observations
  20. SAX J0840.7+2248 Optical Observations
  21. GRB 980425 optical observations
  22. GRB980425: optical obs.
  23. GRB980425: Radio Observations
  24. GRB 980425 optical observations
  25. report on BSAX observations of GRB980425
  26. GRB 980425 optical observations
  27. GRB980326 X-ray Observations
  28. GRB980326, optical observations
  29. GRB980326, optical observations
  30. GRB980329
  31. GRB980329 Keck K-band observations
  32. GRB980329 sub-millimeter observations
  33. GRB980329 optical observations
  34. GRB980329 near-IR observations
  35. GRB980329 near-IR observations
  36. GRB980329 optical observations
  37. GRB980329 infrared observations
  38. GRB980329 optical observations
  39. GRB980326 optical observations
  40. GRB980329 optical observations
  41. GRB980329 VLA observations
  42. GRB980329 near IR observations
  43. GRB980329 optical observations
  44. GRB980329 optical observations
  45. GRB980329 optical observations
  46. GRB980326 optical observations
  47. GRB980326 optical observations
  48. GRB980326 optical observations
  49. GRB980326 optical observations
  50. GRB970508 SAO RAS optical observations
  51. Optical Observations of GRB 970508
  52. GRB 971214: Redshift from Keck Observations
  53. GRB971214: Keck R & I-band Observations
  54. GRB 971227: Optical Observations
  55. Optical Observations of the GRB 971227 field
  56. Optical Observations on GRB 971227
  57. GRB971227: Plaskett R-band observations
  58. Optical Observations for GRB 971227
  59. GRB971227: Further CAHA R-band images
  60. GRB971227: LOTIS observations
  61. GRB 971227: CAHA R-band images
  62. GRB 971227: Optical observations
  63. GRB971214: Optical Observations and Calibrations
  64. Sub-millimeter Observations of GRB 971214 at the JCMT
  65. GRB 971214: EUVE Observations
  66. GRB 971214: Redshift from Keck Optical Observations
  67. GRB 971214: Redshift from Keck Optical Observations
  68. GRB 971214: Apache Point Observatory Optical Observations
  69. GRB 971214: KPNO Optical Observations
  70. Optical Observations of GRB 971214 at Keck
  71. GRB 971214: Optical Observations
  72. Radio Observations of GRB 971214 at the VLA
  73. GRB 971214: USNOFS Observations Summary
  74. GRB 971024: KPNO Optical Observations Summary
  75. GRB 971024: Refined analysis by USNOFS Observations
  76. GRB 971024: KPNO Optical Observations
  77. GRB 971024: USNO Observations
  78. RXTE Observations of SGR 1814-13
  79. GRB 970828: Palomar Observations
  80. GRB 970228: Keck/LRIS Optical Observations

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