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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"

26120 results found.

  1. GRB 240809A: Enhanced Swift-XRT position
  2. GRB 240809A: Skynet & Photon Ranch Optical Afterglow Observations
  3. GRB 240809A: SVOM/GRM observation
  4. GRB 240809A: Swift detection of a burst with a bright optical counterpart
  5. GRB 240805A: ATCA Radio Upper Limits
  6. GRB 240805B: GIT optical upper limit
  7. GRB 240805B: Swift-BAT refined analysis
  8. GRB 240805A: Swift-BAT refined analysis
  9. Konus-Wind detection of GRB 240805A
  10. GRB 240805B Bassano Bresciano Observatory upper limit
  11. GRB240805A: Fermi GBM Observation
  12. GRB 240805B: JinShan optical afterglow detection
  13. GRB 240805B: AbAO, CrAO, and Terskol optical upper limits
  14. GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
  15. GRB 240805B: Swift-XRT refined Analysis
  16. GRB 240805B: Swift/UVOT Upper Limits
  17. GRB 240805A: Swift/UVOT Upper Limits
  18. GRB 240805B: BTA optical afterglow candidate
  19. GRB 240805A: SVOM/GRM observation
  20. GRB 240805B: Enhanced Swift-XRT position
  21. GRB 240805B: LCOGT Optical Upper Limits
  22. Swift GRB 240805B: Global MASTER-Net observations report
  23. GRB 240805B: JinShan optical upper limits
  24. Swift GRB 240805A: Global MASTER-Net observations report
  25. GRB 240805A: Swift-XRT refined Analysis
  26. GRB 240805B: Swift detection of a burst
  27. GRB 240805A: Fermi-LAT detection
  28. GRB 240805A: INTEGRAL spectral analysis
  29. GRB 240805A: A long GRB detected by INTEGRAL
  30. GRB 240805A: Swift detection of a burst
  31. GRB 240730A: Swift-BAT refined analysis
  32. GRB240730A: BOOTES-5/JGT early optical upper limit
  33. Swift GRB 240730A: Global MASTER-Net observations report
  34. GRB 240730A: Swift-XRT refined Analysis
  35. GRB 240715A: Swift-XRT afterglow detection
  36. GRB 240730A: KAIT Optical Upper Limit
  37. GRB 240730A: Swift/UVOT Upper Limits
  38. GRB 240730A: Enhanced Swift-XRT position
  39. GRB 240730A: Swift detection of a burst
  40. GRB 240727A: Swift-BAT refined analysis
  41. LIGO/Virgo/KAGRA S240615dg: GRAWITA wide-field optical observations
  42. GRB 240727A: observations of optical counterpart.
  43. GRB 240727B: Swift-XRT observations
  44. GRB 240727A: Swift/UVOT detection
  45. GRB 240727A: NOT optical observation
  46. GRB 240727A: JinShan optical upper limits
  47. GRB 240727A Bassano Bresciano Observatory upper limit
  48. GRB 240727A: Swift-XRT refined Analysis
  49. GRB 240727A: Enhanced Swift-XRT position
  50. GRB 240727B: Fermi GBM Observation
  51. Swift GRB240727.16: Global MASTER-Net observations report
  52. GRB 240727B: Swift ToO observations
  53. GRB 240727B: Swift/BAT-GUANO arcminute localization of a long burst
  54. GRB240727A: Skynet Optical Afterglow Observations
  55. GRB 240727A: TRT optical afterglow detection
  56. GRB 240727A: KAIT Optical Afterglow Candidate
  57. GRB 240727A: Swift detection of a burst
  58. Swift Trigger 1244778 is not a GRB
  59. Swift GRB240725.11: Global MASTER-Net observations report
  60. GRB 240720A: Swift-BAT refined analysis
  61. LIGO/Virgo/KAGRA S240716b: Upper limits from Swift/BAT-GUANO
  62. LIGO/Virgo/KAGRA S240703ad: Upper limits from Swift/BAT-GUANO
  63. GRB 240720A: AstroSat CZTI detection
  64. GRB 240720A: Fermi GBM observation
  65. GRB 240720A: Swift detection of a burst
  66. Swift GRB240720.02: Global MASTER-Net observations report
  67. GRB 240718A: Fermi-LAT Detection
  68. GRB 240712A: Swift-BAT refined analysis
  69. GRB 240715A: Swift/UVOT observations of the XRT sources.
  70. GRB 240715A: Swift-XRT observations
  71. GRB240713A: Swift/UVOT Upper LImits
  72. EP240708a: X-ray follow-up observations with Swift/XRT
  73. GRB 240713A: Swift-XRT observations
  74. GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
  75. GRB 240712A: Swift-XRT refined Analysis
  76. GRB 240715A: Swift ToO observations
  77. GRB 240713A: optical upper limits from the INAF Asiago Observatory
  78. GRB 240712A ATCA radio observations
  79. IPN triangulation of GRB 240715A (short)
  80. GW s240422ed: Swift UVOT follow-up
  81. GRB 240712A: Swift/UVOT Upper Limits
  82. The EP-WXT source triggered on July 14th is likely a flaring star
  83. GRB 240713A: Tiled Swift observations
  84. GRB 240713A: J-band upper limit from WINTER
  85. GRB 240713A: NOT optical upper limits on three EP/FXT candidates
  86. GRB 240713A: JinShan optical upper limits
  87. GRB 240712A: Swift detection of a burst
  88. EP240708a: SVOM/C-GFT optical upper limit
  89. EP240708a: X-ray follow-up observations with EP/FXT and Swift/XRT
  90. EP240708a: EP-WXT detection of a fast X-ray transient
  91. LIGO/Virgo S240615dg: Swift XRT observations, 28 futher X-ray sources
  92. IPN triangulation of GRB 240628B (short)
  93. EP240703a and EP240703b: Swift/XRT upper limits
  94. EP240703a: BTA observations
  95. EP240703c: Kinder optical follow-up and Swift XRT observations
  96. EP240703a: Liverpool Telescope optical follow-up observations
  97. EP240703a/GRB 240703A: TRT optical candidate likely not real
  98. EP240703c: EP-WXT detection of an X-ray transient
  99. EP240703a/GRB 240703A: TRT and JinShan decaying optical afterglow candidate
  100. IPN triangulation of GRB 240627A

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