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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"

27281 results found.

  1. GRB 180510B: TAROT La Silla observatory optical observations
  2. Swift Trigger 831888: a possible GRB or Galactic transient
  3. GRB 180510B: Swift detection of a burst with an optical counterpart
  4. GRB 180510A: Swift detection of a burst
  5. GRB 180504A: Swift/UVOT Upper Limits
  6. GRB 180504A: Swift-BAT refined analysis
  7. GRB 180505A: Fermi GBM detection
  8. GRB 180416A: AstroSat CZTI detection
  9. GRB 180504A: Swift-XRT refined Analysis
  10. GRB 180504A: NOT afterglow candidate
  11. GRB 180504A: Swift detection of a burst
  12. GRB 180416B: AstroSat CZTI detection
  13. IPN Triangulation of GRB 180427A
  14. GRB 180427A: Fermi GBM detection
  15. Swift Trigger 829046 is probably noise
  16. GRB 180425A: Swift-XRT refined Analysis
  17. GRB 180425A: Swift-BAT refined analysis
  18. GRB 180425A: Swift/UVOT Upper Limits
  19. GRB 180425A: Swift detection of a burst
  20. GRB 180418A: TAROT La Silla observatory early optical observations
  21. GRB 180418A : SQUEAN observations
  22. Fermi GBM trigger 545979055/180421202 is not a GRB
  23. GRB 180418A: Further GROND observations
  24. GRB 180418A: Swift/UVOT Detection
  25. GRB 180418A: Continued RATIR Optical Observations
  26. GRB 180418A GROND observations
  27. GRB 180418A: NOT optical observations
  28. GRB 180418A: Swift-BAT refined analysis
  29. GRB 180418A: Fermi GBM observation
  30. GRB 180418A: Swift-XRT refined Analysis
  31. GRB 180416B: CALET Gamma-Ray Burst Monitor detection
  32. GRB 180418A: RATIR Optical Observations
  33. LIGO/Virgo G299232: LOFAR follow-up
  34. GRB 180418A: Swift-XRT observations
  35. GRB 180418A: Swift detection of a short burst
  36. GRB 180404B: AstroSat CZTI detection
  37. GRB 180416A: Fermi GBM detection
  38. GRB 180411A: CALET Gamma-Ray Burst Monitor detection
  39. GRB 180411B: CALET Gamma-Ray Burst Monitor detection
  40. GRB 180411A: Swift/UVOT Upper Limit
  41. GRB 180410A: Fermi GBM observation
  42. GRB 180409A CALET Gamma-Ray Burst Monitor detection
  43. GRB 180411A: Fermi GBM detection
  44. GRB 180411A: Swift-BAT refined analysis
  45. GRB 180411A: Swift-XRT refined Analysis
  46. GRB 180410A: RATIR Optical Observations
  47. GRB 180411A: Swift detection of a burst
  48. GRB 180410A: Swift-XRT refined Analysis
  49. GRB 180410A: Swift-BAT refined analysis
  50. GRB 180410A: Swift/UVOT Upper Limits
  51. GRB 180409A: Fermi GBM observation
  52. GRB 180410A: Swift detection of a burst or a Galactic transient.
  53. GRB 180402A: ISON-NM early optical limits
  54. GRB 180407A: Swift-BAT refined analysis
  55. Swift Trigger 823014: TAROT Calern observatory optical observations
  56. GRB 180407A: COATLI Upper Limits
  57. Swift Trigger 823014 is probably not a GRB
  58. GRB 180407A: Swift detection of a burst
  59. GRB 180404B: Swift/UVOT Detection
  60. GRB 180404C CALET Gamma-Ray Burst Monitor detection
  61. Fermi GBM triggers 544628550/180405571, 544542853/180404579, 544531428/180404447 are not GRBs
  62. GRB 180404A: Swift/UVOT Detection
  63. GRB 180404A: Swift-XRT refined Analysis
  64. GRB 180404B: Swift-BAT refined analysis
  65. GRB 180404A: Swift-BAT refined analysis
  66. GRB 180404B: Swift-XRT refined Analysis
  67. GRB 180404B: Fermi GBM observation
  68. GRB 180404B: MASTER-OAFA OT observation
  69. Fermi GBM triggers 544440014/180403389 and 544451446/180403521 are not GRBs
  70. GRB 180404A: MASTER-OAFA OT observation
  71. GRB 180404A: VLT/X-shooter redshift
  72. GRB 180404B: Swift detection of a burst with an optical counterpart
  73. GRB 180404A: Swift detection of a burst with an optical afterglow
  74. Konus-Wind observation of GRB 180402A
  75. GRB 180402A: Swift/UVOT Upper Limits
  76. GRB 180402A: Swift-XRT refined Analysis
  77. GRB 180402A: Fermi GBM detection
  78. GRB 180402A, Swift-BAT refined analysis
  79. GRB 180402A: RATIR Upper Limits
  80. GRB 180402A: Swift detection of a possibly short burst
  81. GRB 180331B: Swift/UVOT Upper Limits
  82. GRB 180331B: Swift-XRT refined Analysis
  83. GRB 180331B: Swift-BAT refined analysis
  84. GRB 180331A: Swift-BAT refined analysis
  85. GRB 180331B: Swift detection of a burst
  86. GRB 180331A: Swift-XRT refined Analysis
  87. GRB 180331A: Swift/UVOT Upper Limits
  88. GRB 180331A: Swift detection of a burst
  89. GRB 180329B: VLT/X-shooter spectroscopic observations
  90. GRB 180329B: Swift-BAT refined analysis
  91. GRB 180329B: Swift/UVOT Detection
  92. GRB 180329B: RATIR Optical Observations
  93. Swift Trigger 819863 is not a GRB
  94. GRB 180329B: NOT optical afterglow detection
  95. GRB 180329A: Swift-BAT refined analysis
  96. GRB 180329B: Swift-XRT refined Analysis
  97. GRB 180329B: Swift detection of a burst with an optical afterglow
  98. GRB180325A: AstroSat CZTI detection
  99. Swift Trigger 819301: possible GRB 180329A
  100. Konus-Wind observation of GRB 180317A

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