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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"

36025 results found.

  1. GRB980425: X-ray revised positions
  2. GRB 980923 BATSE Observations
  3. GRB980703 Very Long Baseline Interferometry
  4. GRB970508 optical observations
  5. GRB971214, association with a Galactic star?
  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: Radio transient
  14. GRB980703 H-band Observations
  15. GRB 980703: Spectrum of the proposed optical counterpart
  16. RXTE Observation of GRB 980706
  17. GRB980703: Spectrum of the proposed optical counterpart
  18. GRB980703 Transient Optical Follow-Up
  19. GRB980703: LOTIS observation at early times
  20. GRB980613 Optical Observations
  21. GRB 980703
  22. GRB 980703 H-band Observations
  23. GRB980703 (optical R observations)
  24. GRB980706
  25. GRB980703: radio source/optical transient
  26. BeppoSAX NFI observations of GRB 980703
  27. GRB 980703: ASM Position & Intensity
  28. GRB980703
  29. GRB980703 optical followup
  30. GRB 980613 Near-IR observations
  31. GRB980613, optical observations
  32. GRB 980613: Optical transient and its host galaxy
  33. GRB 980613: Detection of the probable host galaxy
  34. GRB 980613: BATSE Observations
  35. GRB 980613 Optical Observations
  36. GRB 980613 optical observations
  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. BATSE on-board GRB trigger change
  48. GRB 980519 Optical Observations
  49. GRB980519 optical observations
  50. GRB 980519
  51. GRB980519 optical observations
  52. GRB 980519 Optical Observations
  53. GRB980519 BATSE Observations
  54. GRB970519, optical follow-up at Schmidt Calern
  55. GRB980519 optical observations
  56. GRB980519 Optical Observations
  57. GRB980519 Optical Observations
  58. GRB980519 IPN POSITION
  59. GRB980519 Optical Observations
  60. GRB 980519 Optical Observations
  61. GRB980519 optical observations
  62. GRB980515, BeppoSAX IAUC to be submitted
  63. BATSE on-board GRB trigger change
  64. BeppoSAX GRB ALERT: updated position of grb980515
  65. GRB 980425 Radio Light Curve
  66. GRB 980425 Brightness Temperature
  67. GRB980425 BATSE observations
  68. SAX J0840.7+2248 Optical Observations
  69. GRB 980425 optical observations
  70. GRB980425: optical obs.
  71. GRB980425: Radio Observations
  72. GRB 980425 optical observations
  73. GRB 980425 optical observations
  74. GRB 980329 ROSAT observation
  75. GRB980326 X-ray Observations
  76. GRB980326, optical observations
  77. GRB980326, optical observations
  78. GRB980329, Fading IR counterpart to radio source
  79. GRByymmdd, Announcement of automation
  80. GRB980326 IPN annulus
  81. GRB980329 sub-millimeter observations
  82. GRB980329 IPN annulus
  83. GRB980329 near-IR 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. GRB980326 optical observations
  91. GRB980326 optical observations
  92. GRB970508 SAO RAS optical observations
  93. Optical Observations of GRB 970508
  94. GRB 971214: Redshift from Keck Observations
  95. Near-IR follow-up on GRB 971227
  96. GRB971214: Keck R & I-band Observations
  97. GRB 971227: Optical Observations
  98. Optical Observations of the GRB 971227 field
  99. Optical Observations on GRB 971227
  100. GRB971227: Plaskett R-band observations

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