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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"

28221 results found.

  1. GRB 240730A: Swift/UVOT Upper Limits
  2. GRB 240730A: Enhanced Swift-XRT position
  3. GRB 240730A: Swift detection of a burst
  4. LIGO/Virgo/KAGRA S240615dg: GRAWITA wide-field optical observations
  5. GRB 240727B: Swift-XRT observations
  6. GRB 240727A: Swift/UVOT detection
  7. GRB 240727A: NOT optical observation
  8. GRB 240727A: JinShan optical upper limits
  9. GRB 240727A: Fermi GBM Final Real-time Localization
  10. GRB 240727C: AstroSat CZTI detection of a long burst
  11. GRB 240727A: Swift-XRT refined Analysis
  12. GRB 240720B: GRBAlpha detection
  13. GRB 240718A: GRBAlpha detection
  14. GRB 240710B: GRBAlpha detection
  15. GRB 240627A: GRBAlpha detection
  16. GRB 240727A: Enhanced Swift-XRT position
  17. GRB240529A: VIRT optical transient detection
  18. GRB 240727B: Swift ToO observations
  19. GRB 240727B: Swift/BAT-GUANO arcminute localization of a long burst
  20. GRB 240727B: AstroSat CZTI detection
  21. GRB 240726B: AstroSat CZTI detection of a short burst
  22. GRB240727A: Skynet Optical Afterglow Observations
  23. GRB 240727A: TRT optical afterglow detection
  24. GRB 240727A: KAIT Optical Afterglow Candidate
  25. GRB 240727A: Swift detection of a burst
  26. GRB 240726A: AstroSat CZTI detection of a short burst
  27. GRB 240726A: Fermi GBM Final Real-time Localization
  28. IceCube-240725A - IceCube observation of a high-energy neutrino candidate track-like event
  29. Swift Trigger 1244778 is not a GRB
  30. IceCube-240721A: Two candidates from the Zwicky Transient Facility
  31. IceCube-240721A - IceCube observation of a high-energy neutrino candidate track-like event
  32. GRB 240721A: Fermi GBM Final Real-time Localization
  33. GRB 240720B: AstroSat CZTI detection of a short burst
  34. GRB 240720A: AstroSat CZTI detection
  35. GRB 240720A: Swift detection of a burst
  36. Konus-Wind detection of GRB 240718A
  37. GRB 240718A: Fermi-LAT Detection
  38. GRB 240718A: Fermi GBM Final Real-time Localization
  39. GRB 240716A: GECAM-B detection of a long burst
  40. GRB 240713A: 2.2m CAHA optical limit
  41. GRB 240715A: Swift/UVOT observations of the XRT sources.
  42. GRB 240715A: Swift-XRT observations
  43. GRB240713A: Swift/UVOT Upper LImits
  44. EP240708a: X-ray follow-up observations with Swift/XRT
  45. GRB 240715A: GECAM-C detection of a short burst
  46. Konus-Wind detection of GRB 240715A
  47. GRB 240713A: Swift-XRT observations
  48. GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
  49. GRB 240712A: Swift-XRT refined Analysis
  50. GRB 240715A: Swift ToO observations
  51. GRB 240713A: optical upper limits from the INAF Asiago Observatory
  52. GRB 240712A ATCA radio observations
  53. IPN triangulation of GRB 240715A (short)
  54. GW s240422ed: Swift UVOT follow-up
  55. GRB 240712A: Swift/UVOT Upper Limits
  56. EP-WXT flaring star and the optical flaring activity during its decay phase
  57. The EP-WXT source triggered on July 14th is likely a flaring star
  58. GRB 240715A: Fermi GBM Final Real-time Localization
  59. GRB 240713A: Tiled Swift observations
  60. GRB 240713A: J-band upper limit from WINTER
  61. GRB 240713A: NOT optical upper limits on three EP/FXT candidates
  62. GRB 240713A: JinShan optical upper limits
  63. GRB 240713A: OHP/T120 optical upper limit
  64. GRB240713A: X-ray follow-up observation with EP-FXT
  65. GRB 240713B: AstroSat CZTI detection of a long burst
  66. GRB240713A : The first probable GRB Located on-Board SVOM by ECLAIRs
  67. EP240708a: GSP optical upper limit
  68. GRB 240712A: Swift detection of a burst
  69. GRB 240711A: Fermi GBM Final Real-time Localization
  70. GRB 240710A: Fermi GBM Final Real-time Localization
  71. EP240708a: NOT optical observations
  72. EP240708a: SVOM/C-GFT optical upper limit
  73. EP240708a: X-ray follow-up observations with EP/FXT and Swift/XRT
  74. EP240708a: EP-WXT detection of a fast X-ray transient
  75. LIGO/Virgo S240615dg: Swift XRT observations, 28 futher X-ray sources
  76. EP240703b: GSP optical upper limit
  77. GRB 240705A: Fermi GBM Final Real-time Localization
  78. Konus-Wind detection of GRB 240627A
  79. EP240703a and EP240703b: Swift/XRT upper limits
  80. EP240703a: BTA observations
  81. EP240703c: Kinder optical follow-up and Swift XRT observations
  82. EP240703a: BOOTES-3 optical upper limit
  83. EP240703a: Liverpool Telescope optical follow-up observations
  84. EP240703a/GRB 240703A: TRT optical candidate likely not real
  85. EP240703c: EP-WXT detection of an X-ray transient
  86. EP240703a/GRB 240703A: TRT and JinShan decaying optical afterglow candidate
  87. IPN triangulation of GRB 240627A
  88. GRB 240619A: Host galaxy redshift from VLT/X-shooter
  89. The first three GRBs detected by SVOM: X-ray Upper Limits from EP-WXT
  90. EP240703b: EP-WXT detection of a fast X-ray transient
  91. Konus-Wind detection of GRB 240703A (a counterpart of EP240703a)
  92. EP240702a: Swift/XRT upper limit
  93. EP240703a: EP-WXT detection of a fast X-ray transient
  94. EP240702a: GSP optical upper limit
  95. GRB 240702A: Fermi GBM Final Real-time Localization
  96. EP240702a: EP-WXT detection of a fast X-ray transient
  97. GRB 240627A: CALET Gamma-Ray Burst Monitor detection
  98. LIGO/Virgo/KAGRA S240629by: Upper limits from Fermi-GBM Observations
  99. GRB 240629A: Fermi GBM Final Real-time Localization
  100. IPN triangulation of GRB 240619C

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