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"

27294 results found.

  1. GRB 180721A: Swift/UVOT Upper Limits
  2. GRB 180715B: AstroSat CZTI detection
  3. FRB 180714: MASTER optical inspection of the Fast Rado Burst Transient
  4. GRB 180720C: MASTER optical observation
  5. ANTARES neutrino Alert180713.02: MASTER optical observation
  6. Fermi Trigger 553879512: MASTER optical observation
  7. GRB 180722A: MASTER optical observation
  8. GRB 180720C: Swift-XRT refined Analysis
  9. GRB 180721A: Swift-BAT refined analysis
  10. GRB 180720C: Swift-BAT refined analysis
  11. GRB 180721A: Swift-XRT refined Analysis
  12. GRB 180720B: Swift-BAT refined analysis
  13. GRB 180721A: LCO Haleakala observations
  14. GRB 180721A: Swift detection of a burst
  15. GRB 180720B: MAXI/GSC detection
  16. GRB 180720C: Swift/UVOT Upper Limits
  17. GRB 180720C: LT observations
  18. GRB 180720C: Fermi GBM observation
  19. GRB 180706A: OSN detection
  20. GRB 180720B: OSN detection, fading slower?
  21. GRB 180720B: Swift-XRT refined Analysis
  22. GRB 180720C: Swift detection of a burst or possible Galactic Transient
  23. GRB 180720B: Fermi GBM observation
  24. GRB 180720B : Fermi-LAT detection
  25. GRB 180715A: MASTER optical observation
  26. GRB 180720B: Kanata 1.5m optical/NIR observation
  27. GRB 180720B: LCO Haleakala possible bright optical candidate
  28. Correction: Swift trigger #848890 is GRB 180720B (not GRB 180720A)
  29. GRB 180720A: Fermi GBM observation
  30. GRB 180720B: Swift detection of a burst
  31. GRB 180718A: MASTER optical observation
  32. GRB 180718B: MASTER optical observation
  33. GRB180715B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 553369644)
  34. GRB 180715A: Swift/UVOT Upper Limits
  35. Swift detects a flare from AX 1631.9-4752
  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. GRB 180718A short GRB detected by IPN and found in ground analysis of BAT data
  41. Swift Trigger 848621 is not an astrophysical event
  42. Trigger 848584: Swift detection of AX 1631.9-4752
  43. GRB 180715A: CALET Gamma-Ray Burst Monitor detection
  44. GRB 180715A: LCO Sutherland observations
  45. GRB 180715A: COATLI Optical Observations
  46. GRB 180715A: Fermi GBM detection
  47. GRB 180715A: Swift-BAT refined analysis
  48. GRB 180715A: LCO Sutherland possible optical candidate
  49. GRB 180715A: Swift-XRT observations
  50. GRB 180715A: Swift detection of a short hard burst
  51. IceCube-171106A: MASTER optical observation
  52. GRB 180703A: optical afterglow confirmation
  53. GRB 180711A: CALET Gamma-Ray Burst Monitor detection
  54. IceCube-170922A: First Optical observations of the Neutrino Trigger by MASTER Global Net and 25 IceCube alerts inspection.
  55. Swift Trigger 847216: misidentification of IGR J16385-2057
  56. GRB 180709A: BOOTES-5/JGT optical observations
  57. GRB 180709A: Swift-BAT refined analysis
  58. GRB 180709A: Swift/UVOT Upper Limits
  59. GRB 180709A: Swift-XRT refined Analysis
  60. GRB 180709A: Optical limits
  61. GRB 180709A: COATLI Optical Observations
  62. GRB 180703B: further analysis of CGBM data
  63. GRB 180709A: Swift detection of a burst
  64. Trigger 846740: Swift trigger near NGC5055
  65. GRB 180703A: MASTER optical observation
  66. IPN Triangulation of GRB 180703A
  67. GRB 180706A: Swift/UVOT Detection
  68. GRB 180706A: Swift-BAT refined analysis
  69. GRB 180705A: Swift-XRT refined Analysis
  70. GRB 180706A: Fermi GBM observation
  71. GRB 180706A: Swift-XRT refined Analysis
  72. Konus-Wind observation of GRB 180701A
  73. GRB 180705A: Swift/UVOT Upper Limits
  74. GRB 180705A: RATIR Optical Observations
  75. GRB 180706A: COATLI Optical Detection
  76. GRB 180706A: Swift detection of a burst with optical counterpart
  77. IPN Triangulation of GRB 180703B
  78. GRB 180705A: Swift-BAT refined analysis
  79. Fermi GBM triggers 552488966/180705548 and 552490104/180705561 are not GRBs
  80. GRB 180705A: Swift-XRT observations
  81. GRB 180705A: Swift detection of a burst
  82. GRB 180703A: AstroSat CZTI detection
  83. GRB 180704B: CALET Gamma-Ray Burst Monitor detection
  84. GRB 180703A: Swift/UVOT Upper Limits
  85. GRB 180703B: Fermi GBM detection
  86. GRB 180703A: Fermi GBM detection
  87. GRB 180704A: Swift-XRT refined Analysis
  88. GRB 180704A: Swift-BAT refined analysis
  89. GRB 180704A: Swift/UVOT Upper Limits
  90. GRB 180703A: LCO Sutherland possible optical candidate
  91. GRB150101B: INTEGRAL prompt gamma-ray signal from a possible GRB170817A-analogue
  92. GRB 180703B: CALET Gamma-Ray Burst Monitor detection
  93. GRB 180704A: Swift-XRT observations
  94. GRB 180704A: MASTER optical observation
  95. GRB 180704A: Swift detection of a burst
  96. GRB 180703B: Fermi-LAT detection
  97. GRB 180703A: Fermi-LAT detection
  98. GRB 180630A: Swift/UVOT Detection
  99. GRB 180630A: Swift-BAT refined analysis
  100. GRB 180630A: Swift-XRT refined Analysis

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