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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"

32501 results found.

  1. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  2. BeppoSAX NFI Observation of GRB980425
  3. GRB980425 Optical Follow-up
  4. GRB980425: X-ray revised positions
  5. GRB980703 Very Long Baseline Interferometry
  6. GRB970508 optical observations
  7. Optical Observations of the Host Galaxy of GRB 980519
  8. GRB980519, Optical Observations
  9. GRB980703, Host galaxy multicolor photometry
  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: radio source/optical transient
  26. BeppoSAX NFI observations of GRB 980703
  27. GRB980519 observation report
  28. Radio observations of SGRs
  29. GRB 980613 Near-IR observations
  30. GRB980613, optical observations
  31. GRB 980613: Optical transient and its host galaxy
  32. SGR1627-41, RXTE/ASM observations
  33. SGR1627-41, Refined IPN annulus location
  34. GRB 980613: Detection of the probable host galaxy
  35. Reduced error box of SGR 1627-41
  36. SGR1627-41, BeppoSAX-GRBM detections
  37. GRB 980613 Optical Observations
  38. GRB 980613 optical observations
  39. GRB980613 Optical Observations
  40. GRB980613 observations from Palomar
  41. GRB 980613 new optical/IR observations
  42. GRB971214 Secondary Standards
  43. GRB980519 Secondary Standards
  44. SGR1900+14
  45. GRB 980519 Optical Observations
  46. GRB980519 optical observations
  47. GRB980519 I-band observations
  48. GRB 980519
  49. GRB980519 optical observations
  50. GRB 980519 Optical Observations
  51. GRB980519 BATSE Observations
  52. GRB970519, optical follow-up at Schmidt Calern
  53. GRB980519 optical observations
  54. GRB980519 Optical Observations
  55. GRB980519 Optical Observations
  56. GRB980519 IPN POSITION
  57. GRB980519 Optical Observations
  58. GRB 980519 Optical Observations
  59. GRB980519 optical observations
  60. GRB980515, BeppoSAX IAUC to be submitted
  61. GRB980519, BeppoSAX-WFC updated position
  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. GRB980326, optical observations
  73. GRB980326, optical observations
  74. GRB980329, Fading IR counterpart to radio source
  75. GRByymmdd, Announcement of automation
  76. GRB980326 IPN annulus
  77. GRB980329
  78. GRB980329 Keck K-band observations
  79. GRB980329 sub-millimeter observations
  80. GRB980329 IPN annulus
  81. GRB980329 optical observations
  82. GRB980329 near-IR observations
  83. GRB980329 optical observations
  84. GRB980326 optical observations
  85. GRB980326 optical observations
  86. GRB970508 SAO RAS optical observations
  87. GRB 971214: Redshift from Keck Observations
  88. Near-IR follow-up on GRB 971227
  89. GRB971214: Keck R & I-band Observations
  90. GRB 971227: Optical Observations
  91. Optical Observations of the GRB 971227 field
  92. GRB971227: Plaskett R-band observations
  93. GRB 971227: Optical clarifications
  94. GRB971227: LOTIS observations
  95. GRB971214: Optical Observations and Calibrations
  96. Optical Observations of GRB 971214 at Keck
  97. GRB 971024: Refined analysis by USNOFS Observations
  98. GRB 971024: USNO Observations
  99. GRB 970925: BATSE Localization
  100. IRAS 18119-1342 and the possible new SGR

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