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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"

42177 results found.

  1. GRB980519, BeppoSAX-WFC position
  2. GRB980515: SAX-WFC updated position
  3. BeppoSAX GRB ALERT: updated position of grb980515
  4. GRB 980425 Radio Light Curve
  5. GRB 980425 Brightness Temperature
  6. BSAX Observations of GRB980425 field
  7. GRB980425 BATSE observations
  8. SAX J0840.7+2248 Optical Observations
  9. GRB 980425 optical observations
  10. GRB980425: optical obs.
  11. GRB980425: Radio Observations
  12. GRB 980425 optical observations
  13. report on BSAX observations of GRB980425
  14. GRB 980425 optical observations
  15. GRB 980329 ROSAT observation
  16. GRB980326 X-ray Observations
  17. GRB980326, optical observations
  18. GRB980326, optical observations
  19. GRB980329, Fading IR counterpart to radio source
  20. GRByymmdd, Announcement of automation
  21. GRB980326 IPN annulus
  22. GRB980329
  23. GRB980329 Keck K-band observations
  24. GRB980329 sub-millimeter observations
  25. GRB980329 IPN annulus
  26. GRB980329 optical observations
  27. GRB980329 near-IR observations
  28. GRB980329 optical observations
  29. GRB980329 infrared observations
  30. GRB980329 optical observations
  31. GRB980326 optical observations
  32. GRB980329 optical observations
  33. GRB980329 VLA observations
  34. GRB980329 near IR observations
  35. GRB980329 optical observations
  36. GRB980329 optical observations
  37. GRB980329 optical observations
  38. GRB980326 optical observations
  39. GRB980326 optical observations
  40. GRB980326 optical observations
  41. GRB980326 optical observations
  42. GRB970508 SAO RAS optical observations
  43. Optical Observations of GRB 970508
  44. GRB 971214: Redshift from Keck Observations
  45. Near-IR follow-up on GRB 971227
  46. GRB971214: Keck R & I-band Observations
  47. GRB 971227: Optical Observations
  48. Optical Observations of the GRB 971227 field
  49. Optical Observations on GRB 971227
  50. GRB971227: Plaskett R-band observations
  51. GRB 971227: Optical clarifications
  52. Optical Observations for GRB 971227
  53. GRB971227: Further CAHA R-band images
  54. GRB971227: LOTIS observations
  55. GRB 971227: CAHA R-band images
  56. GRB 971227: Optical observations
  57. GRB971214: Optical Observations and Calibrations
  58. Sub-millimeter Observations of GRB 971214 at the JCMT
  59. GRB 971214: EUVE Observations
  60. GRB 971214: Redshift from Keck Optical Observations
  61. GRB 971214: Redshift from Keck Optical Observations
  62. GRB 971214: Apache Point Observatory Optical Observations
  63. GRB 971214: KPNO Optical Observations
  64. Optical Observations of GRB 971214 at Keck
  65. GRB 971214: Optical Observations
  66. Radio Observations of GRB 971214 at the VLA
  67. GRB 971214: USNOFS Observations Summary
  68. GRB 971024: KPNO Optical Observations Summary
  69. GRB 971024: Refined analysis by USNOFS Observations
  70. GRB 971024: KPNO Optical Observations
  71. GRB 971024: USNO Observations
  72. GRB 970925: BATSE Localization
  73. IRAS 18119-1342 and the possible new SGR
  74. Possible new SGR from US Naval Observatory
  75. RXTE Observations of SGR 1814-13
  76. GRB 970828: Palomar Observations
  77. GRB 970228: Keck/LRIS Optical Observations

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