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"

24588 results found.

  1. GRB 180723.13: MASTER optical observation of the short Fermi GBM trigger number 554008254
  2. GRB 180722A: MASTER second inspection
  3. GRB 180723.76: MASTER optical observation of the bright long Fermi GBM trigger number 554062193
  4. GRB 180720B: MASTER Global Net OT observations
  5. GRB 180721A: MITSuME Akeno optical upper limits
  6. GRB 180720B: REM photometry
  7. GRB 180720B: ISON-Castelgrande optical observations
  8. Konus-Wind observation of GRB 180720B
  9. FRB 180714: MASTER optical inspection of the Fast Rado Burst Transient
  10. GRB 180720C: MASTER optical observation
  11. ANTARES neutrino Alert180713.02: MASTER optical observation
  12. Fermi Trigger 553879512: MASTER optical observation
  13. GRB 180722A: MASTER optical observation
  14. GRB 180720B: MITSuME Ishigaki optical observations
  15. GRB 180721A: Swift-BAT refined analysis
  16. GRB 180720C: Swift-BAT refined analysis
  17. GRB 180720B: Swift-BAT refined analysis
  18. GRB 180721A: LCO Haleakala observations
  19. GRB 180720C: LT observations
  20. GRB 180720C: Fermi GBM observation
  21. GRB 180706A: OSN detection
  22. GRB 180720B: LCO optical afterglow observations
  23. GRB 180720B: OSN detection, fading slower?
  24. GRB 180720B: Swift-XRT refined Analysis
  25. GRB 180720B: MITSuME Akeno optical observations
  26. GRB 180720C: Swift detection of a burst or possible Galactic Transient
  27. GRB 180720B: Fermi GBM observation
  28. GRB 180720B : Fermi-LAT detection
  29. GRB 180720B : TSHAO optical observations
  30. GRB 180715A: MASTER optical observation
  31. GRB 180720B: LCO Haleakala possible bright optical candidate
  32. GRB 180720A: Fermi GBM observation
  33. GRB 180718A: MASTER optical observation
  34. GRB 180718B: MASTER optical observation
  35. GRB180715B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 553369644)
  36. GRB 180718B: Fermi GBM detection
  37. GRB 180716A: CALET Gamma-Ray Burst Monitor detection
  38. GRB 180718B: Fermi-LAT detection
  39. GRB 180718A: Fermi GBM detection
  40. Trigger 848584: Swift detection of AX 1631.9-4752
  41. GRB 180715A: CALET Gamma-Ray Burst Monitor detection
  42. GRB 180715A: LCO Sutherland observations
  43. GRB 180715A: Swift-XRT observations
  44. GRB 180715A: Fermi GBM detection
  45. GRB 180715A: Swift-BAT refined analysis
  46. GRB 180715A: LCO Sutherland possible optical candidate
  47. GRB 180715A: Swift detection of a short hard burst
  48. GRB180714A: a long GRB detected by INTEGRAL
  49. IceCube-171106A: MASTER optical observation
  50. GRB 180703A: optical afterglow confirmation
  51. GRB 180711A: CALET Gamma-Ray Burst Monitor detection
  52. IceCube-170922A: First Optical observations of the Neutrino Trigger by MASTER Global Net and 25 IceCube alerts inspection.
  53. GRB 180705A: OSN observations
  54. GRB 180709A: Swift-BAT refined analysis
  55. GRB 180709A: Optical limits
  56. GRB 180703B: further analysis of CGBM data
  57. Trigger 846740: Swift trigger near NGC5055
  58. Konus-Wind observation of GRB 180703A
  59. GRB 180703A: MASTER optical observation
  60. GRB 180706A: Swift-BAT refined analysis
  61. GRB 180706A: Fermi GBM observation
  62. Konus-Wind observation of GRB 180704A
  63. GRB 180706A: Swift-XRT refined Analysis
  64. Konus-Wind observation of GRB 180701A
  65. Konus-Wind observation of GRB 180703B
  66. GRB 180706A: Swift detection of a burst with optical counterpart
  67. GRB 180705A: Swift-BAT refined analysis
  68. GRB 180705A: Swift-XRT observations
  69. GRB 180705A: Swift detection of a burst
  70. GRB 180704B: CALET Gamma-Ray Burst Monitor detection
  71. GRB 180703B: Fermi GBM detection
  72. GRB 180703A: Fermi GBM detection
  73. GRB 180704A: Swift-BAT refined analysis
  74. GRB 180703A: LCO Sutherland possible optical candidate
  75. GRB 180703A: Swift-XRT observations
  76. GRB150101B: INTEGRAL prompt gamma-ray signal from a possible GRB170817A-analogue
  77. GRB 180704A: MASTER optical observation
  78. GRB 180704A: Swift detection of a burst
  79. GRB 180703B: Fermi-LAT detection
  80. GRB 180703A: Fermi-LAT detection
  81. GRB 180630A: Swift-BAT refined analysis
  82. GRB 180630A: Fermi GBM detection
  83. GRB 180626C / Fermi trigger 551697835: MASTER inspection
  84. GRB 180630A: Swift detection of a burst with an optical counterpart
  85. GRB 180626C: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 551697835)
  86. Konus-Wind observation of GRB 180626A
  87. Konus-Wind observation of GRB 180626C
  88. GRB 180624A: NOT optical counterpart
  89. Konus-Wind observation of GRB 180626B
  90. IPN Triangulation of GRB 180626C (short)
  91. IPN Triangulation of GRB 180626B (short)
  92. GRB 180626A: Swift-BAT refined analysis
  93. GRB 180626A: KAIT Optical Upper Limit
  94. GRB 180624A: LCO Haleakala observations
  95. Konus-Wind observation of GRB 180623A
  96. GRB 180626A: LCO Haleakala observations
  97. GRB 180626A: A long GRB detected by INTEGRAL
  98. GRB 180623B: CALET Gamma-Ray Burst Monitor detection
  99. GRB 180624A: Swift-BAT refined analysis
  100. AT2018cow: Swift/BAT data search

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