Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

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"

12087 results found.

  1. Chandra observation of the X-ray afterglow of GRB991216
  2. GRB 991216 Optical spectroscopy/imaging
  3. GRB 991216 Optical Observation
  4. GRB 991216: Extremely bright BATSE burst
  5. IPN localization of GRB991208
  6. GRB 991105: BATSE Observations
  7. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  8. GRB 990915 optical observations
  9. BATSE GRB trigger criteria
  10. GRB990907: BeppoSAX follow up and X-ray afterglow
  11. GRB990806: BATSE Observations
  12. GRB 990705, R-band observations
  13. Infrared and Optical Observations of GRB990705
  14. GRB990704
  15. Refined BeppoSAX-WFC position of GRB990704
  16. GRB990704: BeppoSAX detection
  17. IPN error box for GRB990527
  18. Late Afterglows of GRBs 990510, 990123
  19. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  20. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  21. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  22. BeppoSAX: A new fast X-ray transient
  23. VLT spectrum of GRB990510
  24. GRB 990510: BATSE Observations
  25. GRB990510
  26. GRB 990506: BATSE Observations
  27. GRB 990506, optical observations
  28. GRB990506 Optical observations
  29. New IPN/RXTE error box for GRB990506
  30. GRB 970228: Redshift and properties of the host galaxy
  31. GRB980425 Optical observations of exponential decline at late time
  32. GRB990323 PRECISE IPN POSITION
  33. GRB990321 IPN TRIANGULATION
  34. GRB990308 not a new SGR
  35. GRB990308, Possible new SGR~0209+70
  36. GRB 981220, radio observations
  37. BATSE Flight Anomaly
  38. Optical Observations of GRB990217
  39. GRB 990123: Continued Radio Observations
  40. Search for Potential Images of GRB 990123
  41. "GRB 990123: New BV Observations"
  42. GRB 990123: BATSE Observations
  43. GRB990123 Optical Observation
  44. GRB990123, BeppoSAX-NFI X-ray afterglow detection
  45. GRB 980613: Spectroscopy of the host galaxy
  46. GRB 981226 optical observations
  47. GRB981226, BeppoSAX-NFI follow-up
  48. GRB 981220: BeppoSAX/GRBM results
  49. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  50. GRB 980923 BATSE Observations
  51. SGR1900+14, BeppoSAX-GRBM observations
  52. GRB980703 optical photometry
  53. GRB 980703: BATSE Observations
  54. GRB980703: LOTIS observation at early times
  55. GRB980519 observation report
  56. GRB980703 optical followup
  57. SGR1627-41
  58. Radio observations of SGRs
  59. SGR1627-41, RXTE/ASM observations
  60. Reduced error box of SGR 1627-41
  61. GRB 980613: BATSE Observations
  62. SGR 1627-41
  63. Discovery of a new SGR source, SGR1627-41
  64. SGR 1900+14
  65. SGR1900+14
  66. SGR1900+14
  67. BATSE on-board GRB trigger change
  68. GRB 980519 Optical Observations
  69. GRB980519 BATSE Observations
  70. GRB970519, optical follow-up at Schmidt Calern
  71. GRB980519 optical observations
  72. GRB 980519 Optical Observations
  73. GRB980519, BeppoSAX-WFC updated position
  74. GRB980519, BeppoSAX-WFC position
  75. GRB 980425 Radio Light Curve
  76. GRB980425 BATSE observations
  77. GRB 980329 ROSAT observation
  78. GRB980329 optical observations
  79. GRB980329 optical observations
  80. GRB980329 optical observations
  81. GRB 971227: Optical Observations
  82. GRB971227: LOTIS observations
  83. GRB 971214: EUVE Observations
  84. GRB 971024: USNO Observations
  85. IRAS 18119-1342 and the possible new SGR
  86. Possible new SGR from US Naval Observatory
  87. RXTE Observations of SGR 1814-13

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov