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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"
  1. GRB980519 Optical Observations
  2. GRB980519 Optical Observations
  3. GRB980519 IPN POSITION
  4. GRB980519 Optical Observations
  5. GRB 980519 Optical Observations
  6. GRB980519 optical observations
  7. GRB980515, BeppoSAX IAUC to be submitted
  8. BATSE on-board GRB trigger change
  9. GRB980519, BeppoSAX-WFC updated position
  10. GRB980519, BeppoSAX-WFC position
  11. GRB980515: SAX-WFC updated position
  12. BeppoSAX GRB ALERT: updated position of grb980515
  13. GRB 980425 Radio Light Curve
  14. GRB 980425 Brightness Temperature
  15. BSAX Observations of GRB980425 field
  16. IPN web site of GRBs
  17. GRB980425 BATSE observations
  18. SAX J0840.7+2248 Optical Observations
  19. GRB 980425 optical observations
  20. GRB980425: optical obs.
  21. GRB980425: Radio Observations
  22. GRB 980425 optical observations
  23. report on BSAX observations of GRB980425
  24. GRB 980425 optical observations
  25. GRB 980329 ROSAT observation
  26. GRB980326 X-ray Observations
  27. GRB980326, optical observations
  28. GRB980326, optical observations
  29. GRB980329, Fading IR counterpart to radio source
  30. GRByymmdd, Announcement of automation
  31. GRB980326 IPN annulus
  32. GRB980329
  33. GRB980329 Keck K-band observations
  34. GRB980329 sub-millimeter observations
  35. GRB980329 IPN annulus
  36. GRB980329 optical observations
  37. GRB980329 near-IR observations
  38. GRB980329 near-IR observations
  39. GRB980329 optical observations
  40. GRB980329 infrared observations
  41. GRB980329 optical observations
  42. GRB980326 optical observations
  43. GRB980329 optical observations
  44. GRB980329 VLA observations
  45. GRB980329 near IR observations
  46. GRB980329 optical observations
  47. GRB980329 optical observations
  48. GRB980329 optical observations
  49. GRB980326 optical observations
  50. GRB980326 optical observations
  51. GRB980326 optical observations
  52. GRB980326 optical observations
  53. GRB970508 SAO RAS optical observations
  54. Optical Observations of GRB 970508
  55. GRB 971214: Redshift from Keck Observations
  56. Near-IR follow-up on GRB 971227
  57. GRB971214: Keck R & I-band Observations
  58. GRB 971227: Optical Observations
  59. Optical Observations of the GRB 971227 field
  60. Optical Observations on GRB 971227
  61. GRB971227: Plaskett R-band observations
  62. GRB 971227: Optical clarifications
  63. Optical Observations for GRB 971227
  64. GRB971227: Further CAHA R-band images
  65. GRB971227: LOTIS observations
  66. GRB 971227: CAHA R-band images
  67. GRB 971227: Optical observations
  68. GRB971214: Optical Observations and Calibrations
  69. Sub-millimeter Observations of GRB 971214 at the JCMT
  70. GRB 971214: EUVE Observations
  71. GRB 971214: Redshift from Keck Optical Observations
  72. GRB 971214: Redshift from Keck Optical Observations
  73. GRB 971214: Apache Point Observatory Optical Observations
  74. GRB 971214: KPNO Optical Observations
  75. Optical Observations of GRB 971214 at Keck
  76. GRB 971214: Optical Observations
  77. Radio Observations of GRB 971214 at the VLA
  78. GRB 971214: USNOFS Observations Summary
  79. GRB 971024: KPNO Optical Observations Summary
  80. GRB 971024: Refined analysis by USNOFS Observations
  81. GRB 971024: KPNO Optical Observations
  82. GRB 971024: USNO Observations
  83. GRB 970925: BATSE Localization
  84. IRAS 18119-1342 and the possible new SGR
  85. Possible new SGR from US Naval Observatory
  86. RXTE Observations of SGR 1814-13
  87. GRB 970828: Palomar Observations
  88. GRB 970228: Keck/LRIS Optical Observations

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