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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"

38349 results found.

  1. GRB980425 Optical Follow-up
  2. GRB 980923 BATSE Observations
  3. SGR1900+14, BeppoSAX-GRBM observations
  4. GRB980703 Very Long Baseline Interferometry
  5. GRB970508 optical observations
  6. Optical Observations of the Host Galaxy of GRB 980519
  7. GRB980519, Optical Observations
  8. GRB980703, Host galaxy multicolor photometry
  9. GRB980703 - BeppoSAX/GRBM detection
  10. GRB 980703 (NFI observations)
  11. GRB980703 optical photometry
  12. GRB 980703: BATSE Observations
  13. GRB980703 optical observations
  14. GRB980703: Radio transient
  15. GRB980703 H-band Observations
  16. GRB 980703: Spectrum of the proposed optical counterpart
  17. RXTE Observation of GRB 980706
  18. GRB980703: Spectrum of the proposed optical counterpart
  19. GRB980703 Transient Optical Follow-Up
  20. GRB980703: LOTIS observation at early times
  21. GRB980613 Optical Observations
  22. GRB 980703
  23. GRB980703 (I band observations)
  24. GRB 980703 H-band Observations
  25. GRB980703 (optical R observations)
  26. GRB980706
  27. GRB980703: radio source/optical transient
  28. BeppoSAX NFI observations of GRB 980703
  29. GRB 980703: ASM Position & Intensity
  30. GRB980703
  31. GRB980519 observation report
  32. GRB980703 optical followup
  33. SGR1627-41
  34. Radio observations of SGRs
  35. SGR1900+14 field optical observations
  36. GRB 980613 Near-IR observations
  37. GRB980613, optical observations
  38. GRB 980613: Optical transient and its host galaxy
  39. SGR1627-41, RXTE/ASM observations
  40. SGR1627-41, Refined IPN annulus location
  41. GRB 980613: Detection of the probable host galaxy
  42. GRB 980613: BATSE Observations
  43. SGR1627-41, BeppoSAX-GRBM detections
  44. SGR 1627-41
  45. GRB 980613 Optical Observations
  46. GRB 980613 optical observations
  47. Discovery of a new SGR source, SGR1627-41
  48. GRB980613 Optical Observations
  49. GRB980613 observations from Palomar
  50. GRB980613 BeppoSAX-NFI follow up
  51. GRB 980613 new optical/IR observations
  52. GRB 980613 optical/IR obs.
  53. GRB980613 Near Infra-Red Observations
  54. GRB980611
  55. GRB980613, BeppoSAX WFC positions
  56. GRB971214 Secondary Standards
  57. GRB980519 Secondary Standards
  58. SGR1900+14
  59. SGR1900+14
  60. BATSE on-board GRB trigger change
  61. GRB 980519 Optical Observations
  62. GRB980519 optical observations
  63. GRB980519 I-band observations
  64. GRB 980519
  65. GRB980519 optical observations
  66. GRB 980519 Optical Observations
  67. GRB980519 BATSE Observations
  68. GRB970519, optical follow-up at Schmidt Calern
  69. GRB980519 optical observations
  70. GRB980519 Optical Observations
  71. GRB980519 Optical Observations
  72. GRB 980519 Optical Observations
  73. GRB980519 optical observations
  74. GRB980515, BeppoSAX IAUC to be submitted
  75. BATSE on-board GRB trigger change
  76. GRB980519, BeppoSAX-WFC updated position
  77. GRB980519, BeppoSAX-WFC position
  78. GRB980515: SAX-WFC updated position
  79. BeppoSAX GRB ALERT: updated position of grb980515
  80. GRB 980425 Radio Light Curve
  81. GRB 980425 Brightness Temperature
  82. BSAX Observations of GRB980425 field
  83. IPN web site of GRBs
  84. GRB980425 BATSE observations
  85. SAX J0840.7+2248 Optical Observations
  86. GRB 980425 optical observations
  87. GRB980425: optical obs.
  88. GRB980425: Radio Observations
  89. GRB 980425 optical observations
  90. report on BSAX observations of GRB980425
  91. GRB 980425 optical observations
  92. GRB980326 X-ray Observations
  93. GRB980326, optical observations
  94. GRB980326, optical observations
  95. GRB980329, Fading IR counterpart to radio source
  96. GRByymmdd, Announcement of automation
  97. GRB980326 IPN annulus
  98. GRB980329
  99. GRB980329 Keck K-band observations
  100. GRB980329 sub-millimeter observations

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