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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"

45423 results found.

  1. GRB980613, optical observations
  2. GRB 980613: Optical transient and its host galaxy
  3. SGR1627-41, RXTE/ASM observations
  4. SGR1627-41, Refined IPN annulus location
  5. GRB 980613: Detection of the probable host galaxy
  6. Reduced error box of SGR 1627-41
  7. GRB 980613: BATSE Observations
  8. SGR1627-41, BeppoSAX-GRBM detections
  9. SGR 1627-41
  10. GRB 980613 Optical Observations
  11. GRB 980613 optical observations
  12. Discovery of a new SGR source, SGR1627-41
  13. GRB980613 Optical Observations
  14. GRB980613 observations from Palomar
  15. GRB980613 BeppoSAX-NFI follow up
  16. GRB 980613 new optical/IR observations
  17. GRB 980613 optical/IR obs.
  18. GRB980613 Near Infra-Red Observations
  19. GRB980611
  20. GRB980613, BeppoSAX WFC positions
  21. GRB971214 Secondary Standards
  22. SGR 1900+14
  23. GRB980519 Secondary Standards
  24. SGR1900+14
  25. SGR1900+14
  26. BATSE on-board GRB trigger change
  27. GRB 980519 Optical Observations
  28. GRB980519 optical observations
  29. GRB980519 I-band observations
  30. GRB 980519
  31. GRB980519 optical observations
  32. GRB 980519 Optical Observations
  33. GRB980519 BATSE Observations
  34. GRB970519, optical follow-up at Schmidt Calern
  35. GRB980519 optical observations
  36. GRB980519 Optical Observations
  37. GRB980519 Optical Observations
  38. GRB980519 IPN POSITION
  39. GRB980519 Optical Observations
  40. GRB 980519 Optical Observations
  41. GRB980519 optical observations
  42. GRB980515, BeppoSAX IAUC to be submitted
  43. BATSE on-board GRB trigger change
  44. GRB980519, BeppoSAX-WFC updated position
  45. GRB980519, BeppoSAX-WFC position
  46. GRB980515: SAX-WFC updated position
  47. BeppoSAX GRB ALERT: updated position of grb980515
  48. GRB 980425 Radio Light Curve
  49. GRB 980425 Brightness Temperature
  50. BSAX Observations of GRB980425 field
  51. IPN web site of GRBs
  52. GRB980425 BATSE observations
  53. SAX J0840.7+2248 Optical Observations
  54. GRB 980425 optical observations
  55. GRB980425: optical obs.
  56. GRB980425: Radio Observations
  57. GRB 980425 optical observations
  58. report on BSAX observations of GRB980425
  59. GRB 980425 optical observations
  60. GRB 980329 ROSAT observation
  61. GRB980326 X-ray Observations
  62. GRB980326, optical observations
  63. GRB980326, optical observations
  64. GRB980329, Fading IR counterpart to radio source
  65. GRByymmdd, Announcement of automation
  66. GRB980326 IPN annulus
  67. GRB980329
  68. GRB980329 Keck K-band observations
  69. GRB980329 sub-millimeter observations
  70. GRB980329 IPN annulus
  71. GRB980329 optical observations
  72. GRB980329 near-IR observations
  73. GRB980329 near-IR observations
  74. GRB980329 optical observations
  75. GRB980329 infrared observations
  76. GRB980329 optical observations
  77. GRB980326 optical observations
  78. GRB980329 optical observations
  79. GRB980329 VLA observations
  80. GRB980329 near IR observations
  81. GRB980329 optical observations
  82. GRB980329 optical observations
  83. GRB980329 optical observations
  84. GRB980326 optical observations
  85. GRB980326 optical observations
  86. GRB980326 optical observations
  87. GRB980326 optical observations
  88. GRB970508 SAO RAS optical observations
  89. Optical Observations of GRB 970508
  90. GRB 971214: Redshift from Keck Observations
  91. Near-IR follow-up on GRB 971227
  92. GRB971214: Keck R & I-band Observations
  93. GRB 971227: Optical Observations
  94. Optical Observations of the GRB 971227 field
  95. Optical Observations on GRB 971227
  96. GRB971227: Plaskett R-band observations
  97. GRB 971227: Optical clarifications
  98. Optical Observations for GRB 971227
  99. GRB971227: Further CAHA R-band images
  100. GRB971227: LOTIS observations

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