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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"

37438 results found.

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

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