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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"

28089 results found.

  1. GRB 981220
  2. GRB 980326/Host Galaxy
  3. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  4. BeppoSAX NFI Observation of GRB980425
  5. GRB980329 R,I flux calibration and R,I,K upper limits
  6. GRB980425 Optical Follow-up
  7. GRB 980923 BATSE Observations
  8. SGR1900+14, BeppoSAX-GRBM observations
  9. GRB970508 optical observations
  10. GRB971214, association with a Galactic star?
  11. GRB980519, Optical Observations
  12. GRB980703 - BeppoSAX/GRBM detection
  13. GRB980703 optical photometry
  14. GRB 980703: BATSE Observations
  15. GRB980703 optical observations
  16. GRB980703: Radio transient
  17. GRB 980703: Spectrum of the proposed optical counterpart
  18. GRB980703 Transient Optical Follow-Up
  19. GRB980703: LOTIS observation at early times
  20. GRB980613 Optical Observations
  21. GRB980703 (I band observations)
  22. BeppoSAX NFI observations of GRB 980703
  23. GRB980519 observation report
  24. GRB980703 optical followup
  25. Radio observations of SGRs
  26. SGR1900+14 field optical observations
  27. GRB980613, optical observations
  28. GRB 980613: Optical transient and its host galaxy
  29. SGR1627-41, RXTE/ASM observations
  30. GRB 980613: Detection of the probable host galaxy
  31. Reduced error box of SGR 1627-41
  32. GRB 980613: BATSE Observations
  33. GRB 980613 Optical Observations
  34. GRB 980613 optical observations
  35. Discovery of a new SGR source, SGR1627-41
  36. GRB980613 Optical Observations
  37. GRB980613 observations from Palomar
  38. GRB 980613 optical/IR obs.
  39. GRB980613 Near Infra-Red Observations
  40. GRB971214 Secondary Standards
  41. GRB980519 Secondary Standards
  42. BATSE on-board GRB trigger change
  43. GRB 980519 Optical Observations
  44. GRB 980519
  45. GRB980519 optical observations
  46. GRB 980519 Optical Observations
  47. GRB980519 BATSE Observations
  48. GRB980519 Optical Observations
  49. GRB980519 Optical Observations
  50. GRB 980519 Optical Observations
  51. GRB980515, BeppoSAX IAUC to be submitted
  52. BSAX Observations of GRB980425 field
  53. IPN web site of GRBs
  54. GRB980425 BATSE observations
  55. SAX J0840.7+2248 Optical Observations
  56. GRB980425: optical obs.
  57. GRB980425: Radio Observations
  58. report on BSAX observations of GRB980425
  59. GRB 980329 ROSAT observation
  60. GRB980326 X-ray Observations
  61. GRB980326, optical observations
  62. GRB980326, optical observations
  63. GRB980329, Fading IR counterpart to radio source
  64. GRB980329 Keck K-band observations
  65. GRB980329 sub-millimeter observations
  66. GRB980329 optical observations
  67. GRB980329 near-IR observations
  68. GRB980329 near-IR observations
  69. GRB980326 optical observations
  70. GRB980329 optical observations
  71. GRB980329 VLA observations
  72. GRB980329 optical observations
  73. GRB980329 optical observations
  74. GRB980326 optical observations
  75. GRB980326 optical observations
  76. Optical Observations of GRB 970508
  77. Near-IR follow-up on GRB 971227
  78. Optical Observations of the GRB 971227 field
  79. Optical Observations on GRB 971227
  80. GRB971227: Plaskett R-band observations
  81. GRB 971227: Optical clarifications
  82. GRB971227: Further CAHA R-band images
  83. GRB971227: LOTIS observations
  84. GRB971214: Optical Observations and Calibrations
  85. GRB 971214: Optical Observations
  86. Radio Observations of GRB 971214 at the VLA
  87. GRB 971024: Refined analysis by USNOFS Observations
  88. GRB 971024: KPNO Optical Observations
  89. GRB 970828: Palomar Observations

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