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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"

24587 results found.

  1. GRB 180411A: Swift detection of a burst
  2. GRB 180410A: Swift-BAT refined analysis
  3. GRB 180409A: Fermi GBM observation
  4. GRB 180409A: Swift-XRT observations
  5. Konus-Wind observation of GRB 180404C
  6. GRB 180410A: MITSuME Akeno optical upper limits
  7. Konus-Wind observation of GRB 180409A
  8. IPN Triangulation of GRB 180409A
  9. GRB 180407A: Swift-BAT refined analysis
  10. Swift Trigger 823014 is probably not a GRB
  11. GRB 180407A: Swift detection of a burst
  12. IPN Triangulation of GRB 180404C (long)
  13. Konus-Wind observation of GRB 180404B
  14. Chandra observations of GRB161219B 400 days after the explosion
  15. GRB 180404C CALET Gamma-Ray Burst Monitor detection
  16. GRB 180404A: LCO FTS observations
  17. GRB 180404B: Swift-BAT refined analysis
  18. GRB 180402A: Fermi GBM refined spectral analysis
  19. GRB 180404A: Swift-BAT refined analysis
  20. GRB 180404B: Swift-XRT refined Analysis
  21. GRB 180404B: Fermi GBM observation
  22. GRB 180404B: MASTER-OAFA OT observation
  23. GRB 180404A: MASTER-OAFA OT observation
  24. GRB 180404A: VLT/X-shooter redshift
  25. GRB 180404A: Swift detection of a burst with an optical afterglow
  26. GRB 180402A: Fermi GBM detection
  27. GRB 180402A, Swift-BAT refined analysis
  28. GRB 180402A: KAIT Optical Upper Limit
  29. GRB 180402A: LCO McDonald observations
  30. GRB 180331B: Swift-BAT refined analysis
  31. GRB 180331A: Swift-BAT refined analysis
  32. GRB 180331B: Swift detection of a burst
  33. GRB 180329B: LCO FTS observations
  34. GRB 180329B: Swift-BAT refined analysis
  35. GRB 180329B: NOT optical afterglow detection
  36. GRB 180329A: Swift-BAT refined analysis
  37. GRB 180329B: Swift-XRT refined Analysis
  38. GRB 180329B: Swift detection of a burst with an optical afterglow
  39. GRB180325A: AstroSat CZTI detection
  40. Swift Trigger 819301: possible GRB 180329A
  41. Konus-Wind observation of GRB 180318A
  42. Konus-Wind observation of GRB 180326A
  43. Konus-Wind observation of GRB 180317A
  44. GRB 180325A: further NOT observations
  45. IPN Triangulation of GRB 180326A (long)
  46. Konus-Wind observation of GRB 180316A
  47. Konus-Wind observation of GRB 180325A
  48. GRB 180325A, Swift-BAT refined analysis
  49. GRB 180325A: Global MASTER-Net OT prompt observations
  50. GRB 180325A: TAROT Calern observatory optical observations
  51. GRB 180325A: Swift-XRT refined Analysis
  52. GRB 180325A: prompt REM optical/NIR detection
  53. GRB 180325A: prompt LT observations
  54. GRB 180324A, Swift-BAT refined analysis
  55. GRB 180324A: Swift-XRT refined Analysis
  56. GRB 180324A: RATIR Optical Observations and Possible Afterglow Detection
  57. GRB 180324A: KAIT Optical Upper Limit
  58. GRB 180324A: Swift detection of a burst
  59. IBAS Alert n. 8033: Not a GRB
  60. IPN Triangulation of GRB 180318A (long)
  61. IPN Triangulation of GRB 180317A (short/hard)
  62. IBAS Alert n. 8032: Not a GRB
  63. GRB 180316A: MITSuME Akeno optical upper limits
  64. GRB 180316A: MITSuME Okayama optical upper limits
  65. GRB 180316A: RATIR Optical Observations, Possible Re-brightening
  66. Konus-Wind observation of GRB 180314A
  67. GRB 180316A: Swift-BAT refined analysis
  68. GRB 180316A: Swift-XRT refined Analysis
  69. GRB 180316A: RATIR Optical Observations
  70. GRB 180316A: LCO Cerro Tololo observations
  71. GRB 180314A: MITSuME Okayama optical upper limits
  72. GRB180316A: MASTER-IAC OT light curve
  73. GRB180316A: MASTER-IAC optical detection
  74. GRB 180314B: Swift-BAT refined analysis
  75. GRB 180313A: Fermi GBM detection
  76. GRB 180314A: Swift-BAT refined analysis
  77. GRB 180314A: LCO Siding Springs observations
  78. GRB 180314A: Fermi GBM observation
  79. GRB 180314A: REM optical/NIR observations
  80. GRB 180314A: MASTER-Net OT dtetction
  81. GRB 180314A: Swift detection of a burst with an optical counterpart
  82. GRB 180311A, Swift-BAT refined analysis
  83. GRB 180305A CALET Gamma-Ray Burst Monitor detection
  84. Konus-Wind observation of GRB 180305A
  85. GRB 180305A: Fermi GBM detection
  86. GRB 180305A: Fermi-LAT detection
  87. Konus-Wind observation of GRB 180223A
  88. IPN Triangulation of GRB 180223A (long)
  89. GRB 180210A: Insight-HXMT/HE observation
  90. Swift Trigger 811686 is probably not an astrophysical source.
  91. GRB 180224A: Swift-BAT refined analysis
  92. GRB180224A: Global MASTER-Net bright OT detection
  93. GRB 180224A: Swift detection of a burst with an optical counterpart
  94. GRB 180221B CALET Gamma-Ray Burst Monitor detection
  95. GRB 180222A: Swift-BAT refined analysis
  96. GRB 180222A: A long GRB detected by INTEGRAL
  97. GRB 180219A CALET Gamma-Ray Burst Monitor detection
  98. GRB180221A: MASTER-OAFA optical observations
  99. Swift Trigger 811074: possible GRB 180221A
  100. Konus-Wind observation of GRB 180218A

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