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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"

45645 results found.

  1. GRB980703 H-band Observations
  2. GRB 980703: Spectrum of the proposed optical counterpart
  3. RXTE Observation of GRB 980706
  4. GRB980703: Spectrum of the proposed optical counterpart
  5. GRB980703 Transient Optical Follow-Up
  6. GRB980703: LOTIS observation at early times
  7. GRB980613 Optical Observations
  8. GRB 980703
  9. GRB980703 (I band observations)
  10. GRB 980703 H-band Observations
  11. GRB980703 (optical R observations)
  12. GRB980706
  13. GRB980703: radio source/optical transient
  14. BeppoSAX NFI observations of GRB 980703
  15. GRB 980703: ASM Position & Intensity
  16. GRB980703
  17. GRB980519 observation report
  18. GRB980703 optical followup
  19. SGR1627-41
  20. Radio observations of SGRs
  21. SGR1900+14 field optical observations
  22. GRB 980613 Near-IR observations
  23. GRB980613, optical observations
  24. GRB 980613: Optical transient and its host galaxy
  25. SGR1627-41, RXTE/ASM observations
  26. SGR1627-41, Refined IPN annulus location
  27. GRB 980613: Detection of the probable host galaxy
  28. Reduced error box of SGR 1627-41
  29. GRB 980613: BATSE Observations
  30. SGR1627-41, BeppoSAX-GRBM detections
  31. SGR 1627-41
  32. GRB 980613 Optical Observations
  33. GRB 980613 optical observations
  34. Discovery of a new SGR source, SGR1627-41
  35. GRB980613 Optical Observations
  36. GRB980613 observations from Palomar
  37. GRB980613 BeppoSAX-NFI follow up
  38. GRB 980613 new optical/IR observations
  39. GRB 980613 optical/IR obs.
  40. GRB980613 Near Infra-Red Observations
  41. GRB980611
  42. GRB980613, BeppoSAX WFC positions
  43. GRB971214 Secondary Standards
  44. SGR 1900+14
  45. GRB980519 Secondary Standards
  46. SGR1900+14
  47. SGR1900+14
  48. BATSE on-board GRB trigger change
  49. GRB 980519 Optical Observations
  50. GRB980519 optical observations
  51. GRB980519 I-band observations
  52. GRB 980519
  53. GRB980519 optical observations
  54. GRB 980519 Optical Observations
  55. GRB980519 BATSE Observations
  56. GRB970519, optical follow-up at Schmidt Calern
  57. GRB980519 optical observations
  58. GRB980519 Optical Observations
  59. GRB980519 Optical Observations
  60. GRB980519 IPN POSITION
  61. GRB980519 Optical Observations
  62. GRB 980519 Optical Observations
  63. GRB980519 optical observations
  64. GRB980515, BeppoSAX IAUC to be submitted
  65. BATSE on-board GRB trigger change
  66. GRB980519, BeppoSAX-WFC updated position
  67. GRB980519, BeppoSAX-WFC position
  68. GRB980515: SAX-WFC updated position
  69. BeppoSAX GRB ALERT: updated position of grb980515
  70. GRB 980425 Radio Light Curve
  71. GRB 980425 Brightness Temperature
  72. BSAX Observations of GRB980425 field
  73. IPN web site of GRBs
  74. GRB980425 BATSE observations
  75. SAX J0840.7+2248 Optical Observations
  76. GRB 980425 optical observations
  77. GRB980425: optical obs.
  78. GRB980425: Radio Observations
  79. GRB 980425 optical observations
  80. report on BSAX observations of GRB980425
  81. GRB 980425 optical observations
  82. GRB 980329 ROSAT observation
  83. GRB980326 X-ray Observations
  84. GRB980326, optical observations
  85. GRB980326, optical observations
  86. GRB980329, Fading IR counterpart to radio source
  87. GRByymmdd, Announcement of automation
  88. GRB980326 IPN annulus
  89. GRB980329
  90. GRB980329 Keck K-band observations
  91. GRB980329 sub-millimeter observations
  92. GRB980329 IPN annulus
  93. GRB980329 optical observations
  94. GRB980329 near-IR observations
  95. GRB980329 near-IR observations
  96. GRB980329 optical observations
  97. GRB980329 infrared observations
  98. GRB980329 optical observations
  99. GRB980326 optical observations
  100. GRB980329 optical observations

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