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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"

42730 results found.

  1. BeppoSAX NFI observations of GRB 980703
  2. GRB 980703: ASM Position & Intensity
  3. GRB980703
  4. GRB980519 observation report
  5. GRB980703 optical followup
  6. SGR1627-41
  7. Radio observations of SGRs
  8. SGR1900+14 field optical observations
  9. GRB 980613 Near-IR observations
  10. GRB980613, optical observations
  11. GRB 980613: Optical transient and its host galaxy
  12. SGR1627-41, RXTE/ASM observations
  13. SGR1627-41, Refined IPN annulus location
  14. GRB 980613: Detection of the probable host galaxy
  15. Reduced error box of SGR 1627-41
  16. GRB 980613: BATSE Observations
  17. SGR1627-41, BeppoSAX-GRBM detections
  18. SGR 1627-41
  19. GRB 980613 Optical Observations
  20. GRB 980613 optical observations
  21. Discovery of a new SGR source, SGR1627-41
  22. GRB980613 Optical Observations
  23. GRB980613 observations from Palomar
  24. GRB980613 BeppoSAX-NFI follow up
  25. GRB 980613 new optical/IR observations
  26. GRB 980613 optical/IR obs.
  27. GRB980613 Near Infra-Red Observations
  28. GRB980611
  29. GRB980613, BeppoSAX WFC positions
  30. GRB971214 Secondary Standards
  31. SGR 1900+14
  32. GRB980519 Secondary Standards
  33. SGR1900+14
  34. SGR1900+14
  35. GRB 980519 Optical Observations
  36. GRB980519 optical observations
  37. GRB980519 I-band observations
  38. GRB 980519
  39. GRB980519 optical observations
  40. GRB 980519 Optical Observations
  41. GRB980519 BATSE Observations
  42. GRB970519, optical follow-up at Schmidt Calern
  43. GRB980519 optical observations
  44. GRB980519 Optical Observations
  45. GRB980519 Optical Observations
  46. GRB980519 IPN POSITION
  47. GRB980519 Optical Observations
  48. GRB 980519 Optical Observations
  49. GRB980519 optical observations
  50. GRB980515, BeppoSAX IAUC to be submitted
  51. BATSE on-board GRB trigger change
  52. GRB980519, BeppoSAX-WFC updated position
  53. GRB980519, BeppoSAX-WFC position
  54. GRB980515: SAX-WFC updated position
  55. BeppoSAX GRB ALERT: updated position of grb980515
  56. GRB 980425 Radio Light Curve
  57. GRB 980425 Brightness Temperature
  58. BSAX Observations of GRB980425 field
  59. GRB980425 BATSE observations
  60. SAX J0840.7+2248 Optical Observations
  61. GRB 980425 optical observations
  62. GRB980425: optical obs.
  63. GRB980425: Radio Observations
  64. GRB 980425 optical observations
  65. report on BSAX observations of GRB980425
  66. GRB 980425 optical observations
  67. GRB 980329 ROSAT observation
  68. GRB980326 X-ray Observations
  69. GRB980326, optical observations
  70. GRB980326, optical observations
  71. GRB980329, Fading IR counterpart to radio source
  72. GRByymmdd, Announcement of automation
  73. GRB980326 IPN annulus
  74. GRB980329
  75. GRB980329 Keck K-band observations
  76. GRB980329 sub-millimeter observations
  77. GRB980329 IPN annulus
  78. GRB980329 optical observations
  79. GRB980329 near-IR observations
  80. GRB980329 near-IR observations
  81. GRB980329 optical observations
  82. GRB980329 infrared observations
  83. GRB980329 optical observations
  84. GRB980326 optical observations
  85. GRB980329 optical observations
  86. GRB980329 VLA observations
  87. GRB980329 near IR observations
  88. GRB980329 optical observations
  89. GRB980329 optical observations
  90. GRB980329 optical observations
  91. GRB980326 optical observations
  92. GRB980326 optical observations
  93. GRB980326 optical observations
  94. GRB980326 optical observations
  95. GRB970508 SAO RAS optical observations
  96. Optical Observations of GRB 970508
  97. GRB 971214: Redshift from Keck Observations
  98. Near-IR follow-up on GRB 971227
  99. GRB971214: Keck R & I-band Observations
  100. GRB 971227: Optical Observations

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