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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"

45437 results found.

  1. GRB980703 (I band observations)
  2. GRB 980703 H-band Observations
  3. GRB980703 (optical R observations)
  4. GRB980706
  5. GRB980703: radio source/optical transient
  6. BeppoSAX NFI observations of GRB 980703
  7. GRB 980703: ASM Position & Intensity
  8. GRB980703
  9. GRB980519 observation report
  10. GRB980703 optical followup
  11. SGR1627-41
  12. Radio observations of SGRs
  13. SGR1900+14 field optical observations
  14. GRB 980613 Near-IR observations
  15. GRB980613, optical observations
  16. GRB 980613: Optical transient and its host galaxy
  17. SGR1627-41, RXTE/ASM observations
  18. SGR1627-41, Refined IPN annulus location
  19. GRB 980613: Detection of the probable host galaxy
  20. Reduced error box of SGR 1627-41
  21. GRB 980613: BATSE Observations
  22. SGR1627-41, BeppoSAX-GRBM detections
  23. SGR 1627-41
  24. GRB 980613 Optical Observations
  25. GRB 980613 optical observations
  26. Discovery of a new SGR source, SGR1627-41
  27. GRB980613 Optical Observations
  28. GRB980613 observations from Palomar
  29. GRB980613 BeppoSAX-NFI follow up
  30. GRB 980613 new optical/IR observations
  31. GRB 980613 optical/IR obs.
  32. GRB980613 Near Infra-Red Observations
  33. GRB980611
  34. GRB980613, BeppoSAX WFC positions
  35. GRB971214 Secondary Standards
  36. SGR 1900+14
  37. GRB980519 Secondary Standards
  38. SGR1900+14
  39. SGR1900+14
  40. BATSE on-board GRB trigger change
  41. GRB 980519 Optical Observations
  42. GRB980519 optical observations
  43. GRB980519 I-band observations
  44. GRB 980519
  45. GRB980519 optical observations
  46. GRB 980519 Optical Observations
  47. GRB980519 BATSE Observations
  48. GRB970519, optical follow-up at Schmidt Calern
  49. GRB980519 optical observations
  50. GRB980519 Optical Observations
  51. GRB980519 Optical Observations
  52. GRB980519 IPN POSITION
  53. GRB980519 Optical Observations
  54. GRB 980519 Optical Observations
  55. GRB980519 optical observations
  56. GRB980515, BeppoSAX IAUC to be submitted
  57. BATSE on-board GRB trigger change
  58. GRB980519, BeppoSAX-WFC updated position
  59. GRB980519, BeppoSAX-WFC position
  60. GRB980515: SAX-WFC updated position
  61. BeppoSAX GRB ALERT: updated position of grb980515
  62. GRB 980425 Radio Light Curve
  63. GRB 980425 Brightness Temperature
  64. BSAX Observations of GRB980425 field
  65. IPN web site of GRBs
  66. GRB980425 BATSE observations
  67. SAX J0840.7+2248 Optical Observations
  68. GRB 980425 optical observations
  69. GRB980425: optical obs.
  70. GRB980425: Radio Observations
  71. GRB 980425 optical observations
  72. report on BSAX observations of GRB980425
  73. GRB 980425 optical observations
  74. GRB 980329 ROSAT observation
  75. GRB980326 X-ray Observations
  76. GRB980326, optical observations
  77. GRB980326, optical observations
  78. GRB980329, Fading IR counterpart to radio source
  79. GRByymmdd, Announcement of automation
  80. GRB980326 IPN annulus
  81. GRB980329
  82. GRB980329 Keck K-band observations
  83. GRB980329 sub-millimeter observations
  84. GRB980329 IPN annulus
  85. GRB980329 optical observations
  86. GRB980329 near-IR observations
  87. GRB980329 near-IR observations
  88. GRB980329 optical observations
  89. GRB980329 infrared observations
  90. GRB980329 optical observations
  91. GRB980326 optical observations
  92. GRB980329 optical observations
  93. GRB980329 VLA observations
  94. GRB980329 near IR observations
  95. GRB980329 optical observations
  96. GRB980329 optical observations
  97. GRB980329 optical observations
  98. GRB980326 optical observations
  99. GRB980326 optical observations
  100. GRB980326 optical observations

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