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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"

19608 results found.

  1. GRB 240809A: Swift-BAT refined analysis
  2. GRB 240811A: Bassano Bresciano Observatory upper limit
  3. GRB 240811A: Swift-XRT refined Analysis
  4. GRB 240811A: Swift/UVOT Upper Limits
  5. GRB 240811A: LCOGT Optical Upper Limit
  6. GRB 240811A: Enhanced Swift-XRT position
  7. Konus-Wind detection of GRB 240809A
  8. Swift GRB 240811A: Global MASTER-Net observations report
  9. GRB 240811A: Swift detection of a burst
  10. GRB 240809A: Bassano Bresciano Observatory optical observations
  11. GRB 240809A: KAIT optical observations
  12. GRB 240809A: GIT afterglow observations
  13. GRB 240809A: Swift/UVOT Detection
  14. GRB 240809A: Swift-XRT refined Analysis
  15. IPN triangulation of GRB 240807A / EP 240807a
  16. Swift GRB 240809A: Global MASTER-Net observations report
  17. GRB 240809A: JinShan optical observations
  18. GRB 240809A: Enhanced Swift-XRT position
  19. GRB 240809A: Skynet & Photon Ranch Optical Afterglow Observations
  20. GRB 240809A: SVOM/GRM observation
  21. GRB 240809A: Swift detection of a burst with a bright optical counterpart
  22. GRB 240805A: ATCA Radio Upper Limits
  23. GRB 240805B: GIT optical upper limit
  24. GRB 240805B: Swift-BAT refined analysis
  25. GRB 240805A: Swift-BAT refined analysis
  26. Konus-Wind detection of GRB 240805A
  27. GRB 240805B Bassano Bresciano Observatory upper limit
  28. GRB240805A: Fermi GBM Observation
  29. GRB 240805B: JinShan optical afterglow detection
  30. GRB 240805B: AbAO, CrAO, and Terskol optical upper limits
  31. GRB 240805B: Swift-XRT refined Analysis
  32. GRB 240805B: Swift/UVOT Upper Limits
  33. GRB 240805A: Swift/UVOT Upper Limits
  34. GRB 240805A: SVOM/GRM observation
  35. GRB 240805B: Enhanced Swift-XRT position
  36. GRB 240805B: LCOGT Optical Upper Limits
  37. Swift GRB 240805B: Global MASTER-Net observations report
  38. GRB 240805B: JinShan optical upper limits
  39. Swift GRB 240805A: Global MASTER-Net observations report
  40. GRB 240805A: Swift-XRT refined Analysis
  41. GRB 240805B: Swift detection of a burst
  42. GRB 240805A: Fermi-LAT detection
  43. GRB 240805A: INTEGRAL spectral analysis
  44. GRB 240805A: A long GRB detected by INTEGRAL
  45. GRB 240805A: Swift detection of a burst
  46. GRB 240730A: Swift-BAT refined analysis
  47. GRB240730A: BOOTES-5/JGT early optical upper limit
  48. Swift GRB 240730A: Global MASTER-Net observations report
  49. GRB 240730A: Swift-XRT refined Analysis
  50. GRB 240715A: Swift-XRT afterglow detection
  51. GRB 240730A: KAIT Optical Upper Limit
  52. GRB 240730A: Swift/UVOT Upper Limits
  53. GRB 240730A: Enhanced Swift-XRT position
  54. GRB 240730A: Swift detection of a burst
  55. GRB 240727A: Swift-BAT refined analysis
  56. LIGO/Virgo/KAGRA S240615dg: GRAWITA wide-field optical observations
  57. GRB 240727A: observations of optical counterpart.
  58. GRB 240727B: Swift-XRT observations
  59. GRB 240727A: Swift/UVOT detection
  60. GRB 240727A: NOT optical observation
  61. GRB 240727A: JinShan optical upper limits
  62. GRB 240727A Bassano Bresciano Observatory upper limit
  63. GRB 240727A: Swift-XRT refined Analysis
  64. GRB 240727A: Enhanced Swift-XRT position
  65. GRB 240727B: Fermi GBM Observation
  66. Swift GRB240727.16: Global MASTER-Net observations report
  67. GRB 240727B: Swift ToO observations
  68. GRB 240727B: Swift/BAT-GUANO arcminute localization of a long burst
  69. GRB240727A: Skynet Optical Afterglow Observations
  70. GRB 240727A: TRT optical afterglow detection
  71. GRB 240727A: KAIT Optical Afterglow Candidate
  72. GRB 240727A: Swift detection of a burst
  73. Swift Trigger 1244778 is not a GRB
  74. Swift GRB240725.11: Global MASTER-Net observations report
  75. GRB 240720A: Swift-BAT refined analysis
  76. LIGO/Virgo/KAGRA S240716b: Upper limits from Swift/BAT-GUANO
  77. LIGO/Virgo/KAGRA S240703ad: Upper limits from Swift/BAT-GUANO
  78. GRB 240720A: AstroSat CZTI detection
  79. GRB 240720A: Fermi GBM observation
  80. GRB 240720A: Swift detection of a burst
  81. Swift GRB240720.02: Global MASTER-Net observations report
  82. GRB 240718A: Fermi-LAT Detection
  83. GRB 240712A: Swift-BAT refined analysis
  84. GRB 240715A: Swift/UVOT observations of the XRT sources.
  85. GRB 240715A: Swift-XRT observations
  86. GRB240713A: Swift/UVOT Upper LImits
  87. EP240708a: X-ray follow-up observations with Swift/XRT
  88. GRB 240713A: Swift-XRT observations
  89. GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
  90. GRB 240712A: Swift-XRT refined Analysis
  91. GRB 240715A: Swift ToO observations
  92. GRB 240712A ATCA radio observations
  93. IPN triangulation of GRB 240715A (short)
  94. GW s240422ed: Swift UVOT follow-up
  95. GRB 240712A: Swift/UVOT Upper Limits
  96. The EP-WXT source triggered on July 14th is likely a flaring star
  97. GRB 240713A: Tiled Swift observations
  98. GRB 240712A: Swift detection of a burst
  99. EP240708a: X-ray follow-up observations with EP/FXT and Swift/XRT
  100. EP240708a: EP-WXT detection of a fast X-ray transient

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