Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

19663 results found.

  1. GCN 22984 was for GRB 180720B
  2. GRB 180720B: OSN detection, fading slower?
  3. GRB 180720B: Swift-XRT refined Analysis
  4. GRB 180720C: Swift detection of a burst or possible Galactic Transient
  5. GRB 180720B: Fermi GBM observation
  6. GRB 180720B : Fermi-LAT detection
  7. GRB 180715A: MASTER optical observation
  8. GRB 180720B: Kanata 1.5m optical/NIR observation
  9. GRB 180720B: LCO Haleakala possible bright optical candidate
  10. Correction: Swift trigger #848890 is GRB 180720B (not GRB 180720A)
  11. GRB 180720B: Swift detection of a burst
  12. GRB 180718A: MASTER optical observation
  13. GRB 180715A: Gemini imaging upper limits
  14. GRB 180715A: Swift/UVOT Upper Limits
  15. Swift detects a flare from AX 1631.9-4752
  16. GRB 180718A: Swift ToO observations
  17. GRB 180718B: Swift ToO observations
  18. GRB 180718B: Fermi-LAT detection
  19. GRB 180718A: Fermi GBM detection
  20. GRB 180718A short GRB detected by IPN and found in ground analysis of BAT data
  21. Swift Trigger 848621 is not an astrophysical event
  22. Trigger 848584: Swift detection of AX 1631.9-4752
  23. GRB 180715A: CALET Gamma-Ray Burst Monitor detection
  24. GRB 180715A: Swift-XRT observations
  25. GRB 180715A: Fermi GBM detection
  26. GRB 180715A: Swift-BAT refined analysis
  27. GRB 180715A: GOTO optical limits
  28. GRB 180715A: LCO Sutherland possible optical candidate
  29. GRB 180715A: Swift-XRT observations
  30. GRB 180715A: Swift detection of a short hard burst
  31. IceCube-171106A: MASTER optical observation
  32. GRB 180703A: optical afterglow confirmation
  33. Swift Trigger 847216: misidentification of IGR J16385-2057
  34. GRB 180709A: BOOTES-5/JGT optical observations
  35. GRB 180709A: Swift-BAT refined analysis
  36. GRB 180709A: Swift/UVOT Upper Limits
  37. GRB 180709A: Swift-XRT refined Analysis
  38. GRB 180709A: Optical limits
  39. GRB 180709A: Enhanced Swift-XRT position
  40. GRB 180703A: Swift-XRT afterglow detection
  41. GRB 180709A: Swift detection of a burst
  42. GRB 180705A: RTT150 optical upper limit
  43. Trigger 846740: Swift trigger near NGC5055
  44. IPN Triangulation of GRB 180703A
  45. GRB 180706A: Swift/UVOT Detection
  46. GRB 180706A: Swift-BAT refined analysis
  47. GRB 180705A: Swift-XRT refined Analysis
  48. GRB 180706A: Fermi GBM observation
  49. Konus-Wind observation of GRB 180704A
  50. GRB 180706A: Swift-XRT refined Analysis
  51. GRB 180706A: Enhanced Swift-XRT position
  52. GRB 180705A: TSHAO optical upper limit
  53. GRB 180705A: Swift/UVOT Upper Limits
  54. GRB 180705A: RATIR Optical Observations
  55. GRB 180706A: Swift detection of a burst with optical counterpart
  56. IPN Triangulation of GRB 180703B
  57. GRB 180705A: Swift-BAT refined analysis
  58. GRB 180705A: Enhanced Swift-XRT position
  59. GRB 180705A: MASTER optical observation
  60. GRB 180705A: Swift-XRT observations
  61. GRB 180705A: Swift detection of a burst
  62. GRB 180704A: AstroSat CZTI detection
  63. GRB 180703A: AstroSat CZTI detection
  64. GRB 180703A: Swift/UVOT Upper Limits
  65. GRB 180704A: Swift-XRT refined Analysis
  66. GRB 180704A: Swift-BAT refined analysis
  67. GRB 180704A: Swift/UVOT Upper Limits
  68. GRB 180703A: LCO Sutherland possible optical candidate
  69. GRB 180703A: Swift-XRT observations
  70. GRB 180704A: Enhanced Swift-XRT position
  71. GRB150101B: INTEGRAL prompt gamma-ray signal from a possible GRB170817A-analogue
  72. GRB 180704A: Swift-XRT observations
  73. GRB 180704A: MASTER optical observation
  74. GRB 180704A: Swift detection of a burst
  75. GRB 180703B: Fermi-LAT detection
  76. GRB 180703A: Fermi-LAT detection
  77. GRB 180703A: Tiled Swift observations
  78. GRB 180630A: Swift/UVOT Detection
  79. GRB 180630A: Swift-BAT refined analysis
  80. GRB 180630A: Swift-XRT refined Analysis
  81. GRB 180630A: Fermi GBM detection
  82. GRB 180630A: Enhanced Swift-XRT position
  83. GRB 180630A: Swift detection of a burst with an optical counterpart
  84. Konus-Wind observation of GRB 180626A
  85. IPN Triangulation of GRB 180626C (short)
  86. IPN Triangulation of GRB 180626B (short)
  87. GRB 180626A: Swift-BAT refined analysis
  88. GRB 180626A: KAIT Optical Upper Limit
  89. GRB 180626A: Swift-XRT refined Analysis
  90. GRB 180624A: LCO Haleakala observations
  91. GRB 180626A: Swift/UVOT Detection
  92. Konus-Wind observation of GRB 180623A
  93. GRB 180626A: LCO Haleakala observations
  94. GRB 180626A: ISON-MN optical observations
  95. GRB 180626A: Enhanced Swift-XRT position
  96. GRB 180626A: A long GRB detected by INTEGRAL
  97. GRB 180626A: Swift detection of a burst with an optical counterpart
  98. GRB 180624A: Swift-BAT refined analysis
  99. AT2018cow: Swift/BAT data search
  100. GRB 180624A: RATIR Optical Observations

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