Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

26076 results found.

  1. BATSE Observations of GRB000115
  2. Second RXTE Observation of GRB 000115
  3. GRB991216, UBVRIJHK field photometry
  4. GCN resumes full operations
  5. GRB 991216 VLBA Observations
  6. GRB 991216: J band spectrophotometry
  7. GRB 991216: Detection of the Host and/or Absorber Galaxy
  8. IPN localization of GRB991226
  9. GRB 991216 RXTE ASM Observations
  10. GRB 991216: Updated BATSE parameters
  11. GRB 991217 (SAX J2303.2+0015) Optical observations
  12. Chandra observation of the X-ray afterglow of GRB991216
  13. GRB 991216, optical observations
  14. GRB 991216 Optical spectroscopy/imaging
  15. SAX J2303.2+0015 Optical observations
  16. IR observations of GRB991216
  17. GRB 991217 (SAX J2303.2+0015) Optical observations
  18. GRB991216 Optical and infrared observations of Beethoven Burst
  19. GRB 991216 Radio Observations
  20. GRB 991208 Keck Spectroscopy
  21. GRB 991208 Infrared Detection
  22. GRB991216
  23. GRB 991216--Summary of RXTE Observations
  24. GRB 991216 Optical Observations
  25. GRB 991216, optical observations
  26. GRB 991208 SAO-RAS Spectroscopy
  27. SAX J2303.2+0015: an x-ray/GRB?
  28. GRB 991216, Optical Transient
  29. GRB991216 ('Beethoven Burst') B, R, and K Observations
  30. GRB991216, infrared observations
  31. GRB 991208 optical observations
  32. GRB 991216 Optical Observation
  33. GRB 991216: Extremely bright BATSE burst
  34. R-band Observations of GRB991208 at TNG
  35. GRB991208, optical observations
  36. GRB 991208, Optical Observation
  37. GRB991208, optical observations
  38. GRB 991208 optical observations
  39. Optical Observations of GRB991105
  40. GRB991106: BeppoSAX/BATSE results
  41. GRB991106, near-infrared observations
  42. BeppoSAX NFI Observation of GRB991106
  43. GRB 991106, radio observations
  44. GRB991106: the first BeppoSAX short GRB detection?
  45. GRB 991105: BATSE Observations
  46. GRB 991106 Optical Observations
  47. GRB991106, optical observation at SAO-RAS
  48. GRB 991106, LOTIS Optical Observations
  49. GRB991105: SAX-GRBM/-WFC detection
  50. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  51. GRB 991014, Optical Observations
  52. GRB 991014 - BeppoSAX NFI observations
  53. GRB 991014, radio observations
  54. GRB 991014, Optical Observations
  55. GRB 991014, optical observations
  56. GRB 990915 optical observations
  57. Optical Observations of GRB990907
  58. GRB990907: BeppoSAX follow up and X-ray afterglow
  59. GRB990907 and 990908
  60. GRB 990712 Late Optical Decay and Host Galaxy
  61. GRB990806 BeppoSAX follow up
  62. GRB990806: BATSE Observations
  63. GRB 990806 Optical observations
  64. GRB 990806, Optical Observations
  65. GRB 990806, optical observations
  66. GRB 990806, Optical Observations
  67. GRB990806 UBVRIJHK observations
  68. GRB 990712 Optical Observations
  69. GRB 990712
  70. Late-time HST/STIS Observations of GRB 990510
  71. BeppoSAX NFI Observation of GRB990705
  72. BeppoSAX NFI Observation of GRB990705
  73. GRB 990705, R-band observations
  74. Infrared and Optical Observations of GRB990705
  75. GRB990704: SAX-NFI results summary
  76. GRB990704 radio and optical observations
  77. GRB990704
  78. GRB990704, optical observations
  79. BeppoSAX NFI Observation of GRB990627 X-ray afterglow
  80. Optical Observations of GRB990627
  81. BeppoSAX: GRB990625
  82. Late-time HST/STIS Observation of GRB 990123
  83. Optical Observations of GRB 990506
  84. GRB990527 Optical Observations
  85. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  86. Late Afterglows of GRBs 990510, 990123
  87. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  88. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  89. X-ray/GRB 1SAX J0835.9+5118, Optical Observations
  90. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  91. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  92. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  93. radio observations of X-ray/GRB transient field
  94. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  95. Optical report on X-ray/GRB transient
  96. radio detection of X-ray/GRB transient
  97. BeppoSAX: A new fast X-ray transient
  98. GRB 990510: optical observations
  99. GRB 990510: optical linear polarization
  100. GRB 990510: optical observations

Advanced

Download all Circulars as a .tar.gz archive:
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