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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"

28220 results found.

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

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