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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"

26485 results found.

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

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