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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"

36129 results found.

  1. GRB 181213A: Swift-XRT observations
  2. GRB 181213A: BOOTES-5/JGT optical observations
  3. GRB 181213A: Swift detection of a burst
  4. GRB 181212A: Fermi GBM Detection
  5. GRB 181126B: KAIT Follow-Up Observations of a Fermi Short GRB (Trigger 564897175)
  6. GRB 181201A: continued optical observations in Mondy
  7. GRB 181201A: VLA detection
  8. GRB 181201A: ALMA detection of a fading mm afterglow
  9. GRB 181203A: GROND detection of the afterglow
  10. GRB 181126B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 564897175)
  11. GRB 181201A: continued optical observations in TSHAO and Chilesope
  12. GRB 181203A: BOOTES-3/YA optical observations
  13. GRB 181205A: a long GRB detected by INTEGRAL
  14. GRB 180112B: AstroSat CZTI detection
  15. GRB 181201A: continued optical observations in TSHAO
  16. GRB 181203A: Swift/UVOT Upper Limits
  17. GRB 181201A: Continued GROND observations show that afterglow is still bright
  18. GRB181201A: GOTO optical observations
  19. GRB 181203A: Swift-XRT refined Analysis
  20. GRB 181201A: AstroSat CZTI detection
  21. GRB 181203A: Swift-BAT refined analysis
  22. GRB 181201A: Swift/UVOT Detection
  23. GRB 181202A: Swift/UVOT Detection
  24. GRB 181201A: continued optical observations in SAAO and Chilesope
  25. GRB 181202A: RATIR Optical and NIR Observations
  26. Konus-Wind observation of GRB 181201A
  27. GRB 181203A: Enhanced Swift-XRT position
  28. GRB 181203A: Swift detection of a burst
  29. GRB 181201A: Further COATLI Optical Monitoring
  30. GRB 181201A: Insight-HXMT/HE detection
  31. GRB 181202A: Global MASTER-Net optical observations
  32. GRB 181202A: Swift-BAT refined analysis
  33. GRB 181201A: VLT/FORS2 tentative spectroscopic redshift
  34. GRB 181202A: Swift-XRT refined Analysis
  35. GRB 181201A: GROND detection of the afterglow and redshift upper limit of z < 3
  36. GRB 181201A: optical observations in Chilescope observatory
  37. GRB 181201A: Global MASTER-Net prompt optical descovery and afterglow observations
  38. GRB 181202A: Enhanced Swift-XRT position
  39. GRB 181202A: Swift detection of a burst with an optical counterpart
  40. GRB 181201A: COATLI Optical Detection
  41. GRB 181201A: Fermi-LAT detection
  42. GRB 181201A: Zeiss-1000/CrAO optical observations
  43. GRB 181201A: NOT optical observations
  44. GRB 181201A: optical observations in SAAO
  45. GRB 181201A MASTER-Net OT continued observation
  46. GRB 181201A: iTelescope optical afterglow detection
  47. GRB 181201A: Swift-XRT afterglow detection
  48. GRB 181201A: Swift ToO observations
  49. GRB 181201A: Swift-XRT afterglow
  50. GRB 181201A: likely Swift/XRT afterglow
  51. GRB 181201A MASTER-Net OT detection
  52. GRB 181201A: a long GRB detected by INTEGRAL
  53. GRB 181119A: CALET Gamma-Ray Burst Monitor detection
  54. GRB 181123B: ATCA 5/9 GHz rapid-response radio observation
  55. Short-duration GRB 181121.4: MASTER-Tavrida possible OT detection near the PGC galaxy during large Fermi error box inspection
  56. GRB 181127A : a long GRB detected by INTEGRAL
  57. GRB 181126A: Swift-BAT refined analysis
  58. GRB 181126A: No Ks-band afterglow detection with Keck I
  59. GRB 181123B: Keck further near-infrared imaging
  60. GRB 181126A: Swift/UVOT Upper Limits
  61. GRB 181126A: Swift-XRT refined Analysis
  62. GRB 181126A deep Gemini imaging
  63. GRB 181126A: Fermi GBM observation
  64. Konus-Wind observation of GRB 181121A
  65. GRB 181126A: Enhanced Swift-XRT position
  66. GRB 181126A: Prompt enhanced Swift-XRT position
  67. GRB 181126A: Swift detection of a burst
  68. GRB 181123B: Insight-HXMT/HE detection
  69. GRB 181125A: Fermi GBM observation
  70. GRB 181125A: Swift-BAT refined analysis
  71. IPN Triangulation of GRB 181121A (short)
  72. GRB 181125A: Swift detection of a burst
  73. GRB 181121A: AstroSat CZTI detection
  74. Swift J1858.6-0814/GRB 181123A: Swift/BAT location correction to GCN 23442
  75. Swift trigger 873178: GRB 181123A is Swift J1858.6-0814
  76. GRB 181123B: Global MASTER Net optical inspection
  77. GRB 181123B: Swift-BAT lag analysis and search for extended emission
  78. GRB 181123A, Swift-BAT refined analysis
  79. GRB 181123B: Keck near-infrared imaging
  80. GRB 181123B: Gemini-North optical detection
  81. GRB 181119A: AstroSat CZTI detection
  82. GRB 181123B: Swift/UVOT Upper Limits
  83. GRB 181020A: AstroSat CZTI detection
  84. GRB 181123B: Swift-XRT refined Analysis
  85. GRB 181123B: Enhanced Swift-XRT position
  86. GRB 181123B: Prompt enhanced Swift-XRT position
  87. GRB 181123B: Swift detection of a short burst
  88. GRB 181123A: Swift detection of a burst
  89. GRB 181119A: Insight-HXMT/HE detection
  90. GRB 181121A: AGILE/MCAL detection of a burst
  91. GRB 181120A: Fermi GBM observation
  92. GRB 181120A: Fermi-LAT detection
  93. Swift Trigger 872470: further Swift analysis
  94. Swift Trigger 872470 is probably not a GRB
  95. Konus-Wind observation of GRB 181110A
  96. GRB 181110A: optical observations in Chilescope observatory
  97. GROND observations of GRB181110A
  98. GRB 181110A: VLT/X-shooter redshift
  99. GRB 181110A, Swift-BAT refined analysis
  100. GRB 181110A: Swift/UVOT Detection

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