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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"

35988 results found.

  1. GRB980613 observations from Palomar
  2. GRB980613 BeppoSAX-NFI follow up
  3. GRB 980613 new optical/IR observations
  4. GRB 980613 optical/IR obs.
  5. GRB980613 Near Infra-Red Observations
  6. GRB980611
  7. GRB980613, BeppoSAX WFC positions
  8. GRB971214 Secondary Standards
  9. GRB980519 Secondary Standards
  10. BATSE on-board GRB trigger change
  11. GRB 980519 Optical Observations
  12. GRB980519 optical observations
  13. GRB 980519
  14. GRB980519 optical observations
  15. GRB 980519 Optical Observations
  16. GRB980519 BATSE Observations
  17. GRB970519, optical follow-up at Schmidt Calern
  18. GRB980519 optical observations
  19. GRB980519 Optical Observations
  20. GRB980519 Optical Observations
  21. GRB980519 IPN POSITION
  22. GRB980519 Optical Observations
  23. GRB 980519 Optical Observations
  24. GRB980519 optical observations
  25. GRB980515, BeppoSAX IAUC to be submitted
  26. BATSE on-board GRB trigger change
  27. BeppoSAX GRB ALERT: updated position of grb980515
  28. GRB 980425 Radio Light Curve
  29. GRB 980425 Brightness Temperature
  30. GRB980425 BATSE observations
  31. SAX J0840.7+2248 Optical Observations
  32. GRB 980425 optical observations
  33. GRB980425: optical obs.
  34. GRB980425: Radio Observations
  35. GRB 980425 optical observations
  36. GRB 980425 optical observations
  37. GRB 980329 ROSAT observation
  38. GRB980326 X-ray Observations
  39. GRB980326, optical observations
  40. GRB980326, optical observations
  41. GRB980329, Fading IR counterpart to radio source
  42. GRByymmdd, Announcement of automation
  43. GRB980326 IPN annulus
  44. GRB980329 sub-millimeter observations
  45. GRB980329 IPN annulus
  46. GRB980329 near-IR observations
  47. GRB980326 optical observations
  48. GRB980329 optical observations
  49. GRB980329 VLA observations
  50. GRB980329 near IR observations
  51. GRB980329 optical observations
  52. GRB980329 optical observations
  53. GRB980326 optical observations
  54. GRB980326 optical observations
  55. GRB970508 SAO RAS optical observations
  56. Optical Observations of GRB 970508
  57. GRB 971214: Redshift from Keck Observations
  58. Near-IR follow-up on GRB 971227
  59. GRB971214: Keck R & I-band Observations
  60. GRB 971227: Optical Observations
  61. Optical Observations of the GRB 971227 field
  62. Optical Observations on GRB 971227
  63. GRB971227: Plaskett R-band observations
  64. GRB 971227: Optical clarifications
  65. Optical Observations for GRB 971227
  66. GRB971227: Further CAHA R-band images
  67. GRB971227: LOTIS observations
  68. GRB 971227: CAHA R-band images
  69. GRB 971227: Optical observations
  70. Sub-millimeter Observations of GRB 971214 at the JCMT
  71. GRB 971214: EUVE Observations
  72. GRB 971214: Redshift from Keck Optical Observations
  73. GRB 971214: Redshift from Keck Optical Observations
  74. GRB 971214: Apache Point Observatory Optical Observations
  75. GRB 971214: KPNO Optical Observations
  76. Optical Observations of GRB 971214 at Keck
  77. GRB 971214: Optical Observations
  78. Radio Observations of GRB 971214 at the VLA
  79. GRB 971214: USNOFS Observations Summary
  80. GRB 971024: KPNO Optical Observations Summary
  81. GRB 971024: Refined analysis by USNOFS Observations
  82. GRB 971024: KPNO Optical Observations
  83. GRB 971024: USNO Observations
  84. GRB 970925: BATSE Localization
  85. IRAS 18119-1342 and the possible new SGR
  86. Possible new SGR from US Naval Observatory
  87. GRB 970828: Palomar Observations
  88. GRB 970228: Keck/LRIS Optical Observations

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