Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

11792 results found.

  1. GRB 180626A: Swift-XRT refined Analysis
  2. GRB 180626A: COATLI Optical Detection
  3. Konus-Wind observation of GRB 180623A
  4. GRB 180626A: LCO Haleakala observations
  5. GRB 180626A: ISON-MN optical observations
  6. GRB 180626A: A long GRB detected by INTEGRAL
  7. GRB 180626A: Swift detection of a burst with an optical counterpart
  8. GRB 180623B: CALET Gamma-Ray Burst Monitor detection
  9. GRB 180624A: LBT/MODS redshift measurement
  10. GRB 180613A: LCO Afterglow detection
  11. GRB 180624A: LCO Siding Springs afterglow candidate
  12. GRB 180624A: Swift-XRT refined Analysis
  13. GRB 180624A: Enhanced Swift-XRT position
  14. GRB 180624A: Swift detection of a burst
  15. GRB 180620B: Swift/UVOT Detection
  16. GRB 180620A iTelescope observation
  17. Konus-Wind observation of GRB 180620B
  18. Konus-Wind observation of GRB 180620A
  19. Konus-Wind observation of GRB 180618A (a short GRB with extended emission)
  20. GROND observations of GRB 180620A
  21. GRB 180620B: Swift-XRT refined Analysis
  22. GRB 180620B: Fermi GBM detection
  23. GRB 180620A: KAIT Optical Observations
  24. GRB 180620A: Xinglong-2.16m optical observations
  25. GRB 180620B: Swift detection of a burst with an optical counterpart
  26. GRB 180620A: COATLI Detection and Light Curve
  27. GRB 180620A: LCO McDonald observations
  28. GRB 180620A: MASTER OT observation
  29. GRB 180618A: Fermi GBM detection
  30. GRB 180618A: Swift-XRT refined Analysis
  31. GRB 180618A: Swift detection of a burst with an optical counterpart
  32. GRB 180614A: MASTER observation
  33. GRB 180613A: Swift-XRT refined Analysis
  34. Konus-Wind observation of GRB 180611A
  35. GRB 180613A: Swift detection of a burst
  36. GRB 180602A: Swift-XRT refined Analysis
  37. GRB 180602A: Swift-BAT refined analysis
  38. GRB 180602A: Swift detection of a burst
  39. Konus-Wind observation of GRB 180529A
  40. Konus-Wind observation of GRB 180526A
  41. Konus-Wind observation of GRB 180523A
  42. IPN Triangulation of GRB 180523A
  43. GRB 180523A: CALET Gamma-Ray Burst Monitor detection
  44. GRB 180514A: 1.5m OSN optical observations
  45. GRB 180514A: Swift-XRT refined Analysis
  46. GRB 180514A: Swift detection of a burst
  47. Konus-Wind observation of GRB 180510A
  48. GRB 180512A: Swift-XRT refined Analysis
  49. GRB 180512A: Swift detection of a burst
  50. GRB 180510B: Swift-XRT refined Analysis
  51. GRB 180510B: Swift-BAT refined analysis
  52. GRB 180510B: Swift detection of a burst with an optical counterpart
  53. GRB 180504A: Swift-BAT refined analysis
  54. GRB 180504A: Swift-XRT refined Analysis
  55. GRB 180504A: Swift detection of a burst
  56. Konus-Wind observation of GRB 180427A
  57. GRB 180425A: Swift-XRT refined Analysis
  58. GRB 180425A: Swift detection of a burst
  59. GRB 180418A: Swift/UVOT Detection
  60. GRB 180418A GROND observations
  61. GRB 180418A: Xinglong TNT optical upper limit
  62. GRB 180418A: Swift-XRT refined Analysis
  63. LIGO/Virgo G299232: LOFAR follow-up
  64. GRB 180418A: Swift-XRT observations
  65. GRB 180418A: KAIT Optical Afterglow Candidate
  66. Konus-Wind observation of GRB 180411A
  67. Konus-Wind observation of GRB 180404C
  68. Konus-Wind observation of GRB 180409A
  69. GRB 180407A: Swift-BAT refined analysis
  70. Swift Trigger 823014 is probably not a GRB
  71. Konus-Wind observation of GRB 180404B
  72. Chandra observations of GRB161219B 400 days after the explosion
  73. GRB 180404A: Swift-XRT refined Analysis
  74. GRB 180404B: Swift-XRT refined Analysis
  75. Fermi GBM triggers 544440014/180403389 and 544451446/180403521 are not GRBs
  76. Konus-Wind observation of GRB 180402A
  77. GRB 180402A: KAIT Optical Upper Limit
  78. GRB 180331B: Swift-XRT refined Analysis
  79. GRB 180331B: Swift-BAT refined analysis
  80. GRB 180329B: NOT optical afterglow detection
  81. GRB 180329B: Swift-XRT refined Analysis
  82. GRB 180329B: Swift detection of a burst with an optical afterglow
  83. GRB 180325A: VLT/X-shooter spectroscopic observations
  84. Konus-Wind observation of GRB 180318A
  85. Konus-Wind observation of GRB 180326A
  86. Konus-Wind observation of GRB 180317A
  87. IPN Triangulation of GRB 180326A (long)
  88. Konus-Wind observation of GRB 180316A
  89. Konus-Wind observation of GRB 180324A
  90. Konus-Wind observation of GRB 180325A
  91. GRB 180325A: Global MASTER-Net OT prompt observations
  92. GRB 180325A: TAROT Calern observatory optical observations
  93. GRB 180325A: Swift-XRT refined Analysis
  94. GRB 180324A: KAIT Optical Upper Limit
  95. IPN Triangulation of GRB 180318A (long)
  96. Konus-Wind observation of GRB 180314A
  97. GRB 180316A: Swift/UVOT Detection
  98. GRB 180314A: MITSuME Okayama optical upper limits
  99. GRB 180316A: Swift detection of a burst
  100. GRB 180314A: MASTER-Net OT dtetction

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