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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"

24887 results found.

  1. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  2. BeppoSAX NFI Observation of GRB980425
  3. GRB980329 R,I flux calibration and R,I,K upper limits
  4. GRB980425 Optical Follow-up
  5. GRB 980923 BATSE Observations
  6. SGR1900+14, BeppoSAX-GRBM observations
  7. GRB970508 optical observations
  8. GRB971214, association with a Galactic star?
  9. GRB980519, Optical Observations
  10. GRB980703 - BeppoSAX/GRBM detection
  11. GRB980703 optical photometry
  12. GRB 980703: BATSE Observations
  13. GRB980703 optical observations
  14. GRB980703: Radio transient
  15. GRB 980703: Spectrum of the proposed optical counterpart
  16. GRB980703 Transient Optical Follow-Up
  17. GRB980703: LOTIS observation at early times
  18. GRB980613 Optical Observations
  19. GRB980703 (I band observations)
  20. BeppoSAX NFI observations of GRB 980703
  21. GRB980519 observation report
  22. GRB980703 optical followup
  23. Radio observations of SGRs
  24. SGR1900+14 field optical observations
  25. GRB980613, optical observations
  26. GRB 980613: Optical transient and its host galaxy
  27. SGR1627-41, RXTE/ASM observations
  28. GRB 980613: Detection of the probable host galaxy
  29. Reduced error box of SGR 1627-41
  30. GRB 980613: BATSE Observations
  31. GRB 980613 Optical Observations
  32. GRB 980613 optical observations
  33. Discovery of a new SGR source, SGR1627-41
  34. GRB980613 Optical Observations
  35. GRB980613 observations from Palomar
  36. GRB 980613 optical/IR obs.
  37. GRB980613 Near Infra-Red Observations
  38. GRB971214 Secondary Standards
  39. GRB980519 Secondary Standards
  40. BATSE on-board GRB trigger change
  41. GRB 980519 Optical Observations
  42. GRB 980519
  43. GRB980519 optical observations
  44. GRB 980519 Optical Observations
  45. GRB980519 BATSE Observations
  46. GRB980519 Optical Observations
  47. GRB980519 Optical Observations
  48. GRB 980519 Optical Observations
  49. GRB980515, BeppoSAX IAUC to be submitted
  50. BSAX Observations of GRB980425 field
  51. IPN web site of GRBs
  52. GRB980425 BATSE observations
  53. SAX J0840.7+2248 Optical Observations
  54. GRB980425: optical obs.
  55. GRB980425: Radio Observations
  56. report on BSAX observations of GRB980425
  57. GRB 980329 ROSAT observation
  58. GRB980326 X-ray Observations
  59. GRB980326, optical observations
  60. GRB980326, optical observations
  61. GRB980329, Fading IR counterpart to radio source
  62. GRB980329 Keck K-band observations
  63. GRB980329 sub-millimeter observations
  64. GRB980329 optical observations
  65. GRB980329 near-IR observations
  66. GRB980329 near-IR observations
  67. GRB980326 optical observations
  68. GRB980329 optical observations
  69. GRB980329 VLA observations
  70. GRB980329 optical observations
  71. GRB980329 optical observations
  72. GRB980326 optical observations
  73. GRB980326 optical observations
  74. Optical Observations of GRB 970508
  75. Near-IR follow-up on GRB 971227
  76. Optical Observations of the GRB 971227 field
  77. Optical Observations on GRB 971227
  78. GRB971227: Plaskett R-band observations
  79. GRB 971227: Optical clarifications
  80. GRB971227: Further CAHA R-band images
  81. GRB971227: LOTIS observations
  82. GRB971214: Optical Observations and Calibrations
  83. GRB 971214: Optical Observations
  84. Radio Observations of GRB 971214 at the VLA
  85. GRB 971024: Refined analysis by USNOFS Observations
  86. GRB 971024: KPNO Optical Observations
  87. GRB 970828: Palomar Observations

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