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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"

21791 results found.

  1. GRB 980613 Optical Observations
  2. GRB 980613 optical observations
  3. Discovery of a new SGR source, SGR1627-41
  4. GRB980613 Optical Observations
  5. GRB980613 observations from Palomar
  6. GRB 980613 new optical/IR observations
  7. GRB 980613 optical/IR obs.
  8. GRB980613 Near Infra-Red Observations
  9. GRB971214 Secondary Standards
  10. SGR 1900+14
  11. GRB980519 Secondary Standards
  12. SGR1900+14
  13. SGR1900+14
  14. GRB 980519 Optical Observations
  15. GRB980519 optical observations
  16. GRB980519 I-band observations
  17. GRB 980519
  18. GRB980519 optical observations
  19. GRB 980519 Optical Observations
  20. GRB980519 BATSE Observations
  21. GRB980519 optical observations
  22. GRB980519 Optical Observations
  23. GRB980519 Optical Observations
  24. GRB980519 Optical Observations
  25. GRB 980519 Optical Observations
  26. GRB980519 optical observations
  27. GRB 980425 Brightness Temperature
  28. BSAX Observations of GRB980425 field
  29. GRB980425 BATSE observations
  30. SAX J0840.7+2248 Optical Observations
  31. GRB 980425 optical observations
  32. GRB980425: optical obs.
  33. GRB980425: Radio Observations
  34. GRB 980425 optical observations
  35. report on BSAX observations of GRB980425
  36. GRB 980425 optical observations
  37. GRB980326 X-ray Observations
  38. GRB980326, optical observations
  39. GRB980326, optical observations
  40. GRB980329, Fading IR counterpart to radio source
  41. GRB980329
  42. GRB980329 Keck K-band observations
  43. GRB980329 sub-millimeter observations
  44. GRB980329 optical observations
  45. GRB980329 near-IR observations
  46. GRB980329 near-IR observations
  47. GRB980329 optical observations
  48. GRB980329 infrared observations
  49. GRB980329 optical observations
  50. GRB980326 optical observations
  51. GRB980329 optical observations
  52. GRB980329 VLA observations
  53. GRB980329 near IR observations
  54. GRB980329 optical observations
  55. GRB980329 optical observations
  56. GRB980329 optical observations
  57. GRB980326 optical observations
  58. GRB980326 optical observations
  59. GRB980326 optical observations
  60. GRB980326 optical observations
  61. GRB970508 SAO RAS optical observations
  62. Optical Observations of GRB 970508
  63. GRB 971214: Redshift from Keck Observations
  64. GRB971214: Keck R & I-band Observations
  65. GRB 971227: Optical Observations
  66. Optical Observations of the GRB 971227 field
  67. Optical Observations on GRB 971227
  68. GRB971227: Plaskett R-band observations
  69. Optical Observations for GRB 971227
  70. GRB971227: Further CAHA R-band images
  71. GRB971227: LOTIS observations
  72. GRB 971227: CAHA R-band images
  73. GRB 971227: Optical observations
  74. GRB971214: Optical Observations and Calibrations
  75. Sub-millimeter Observations of GRB 971214 at the JCMT
  76. GRB 971214: EUVE Observations
  77. GRB 971214: Redshift from Keck Optical Observations
  78. GRB 971214: Redshift from Keck Optical Observations
  79. GRB 971214: Apache Point Observatory Optical Observations
  80. GRB 971214: KPNO Optical Observations
  81. Optical Observations of GRB 971214 at Keck
  82. GRB 971214: Optical Observations
  83. Radio Observations of GRB 971214 at the VLA
  84. GRB 971214: USNOFS Observations Summary
  85. GRB 971024: KPNO Optical Observations Summary
  86. GRB 971024: Refined analysis by USNOFS Observations
  87. GRB 971024: KPNO Optical Observations
  88. GRB 971024: USNO Observations
  89. RXTE Observations of SGR 1814-13
  90. GRB 970828: Palomar Observations
  91. GRB 970228: Keck/LRIS Optical Observations

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