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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"

45738 results found.

  1. LIGO/Virgo/KAGRA S240527fv: Upper limits from Swift/BAT-GUANO
  2. LIGO/Virgo/KAGRA S240525p: Upper limits from Swift/BAT-GUANO
  3. GRB 240529A: J-band detections with WINTER
  4. GRB 240529A: Skynet Optical Observations
  5. LXT 240528A: LEIA detection of a fast X-ray transient
  6. GRB 240529A: Swift-BAT refined analysis
  7. LIGO/Virgo S240527fv: GRANDMA/FRAM-Auger Optical Observations
  8. GRB 240529A: Swift-XRT refined Analysis
  9. GRB240529A: BOOTES-6/DPRT optical detection
  10. GRB 240529A: Swift/UVOT Detection
  11. GRB 240529A: NOT optical observations
  12. GRB 240529A: AstroSat CZTI detection
  13. GRB 240529A: GOTO optical afterglow detection
  14. GRB 240527B: Swift-XRT afterglow detection
  15. GRB 240529A: Enhanced Swift-XRT position
  16. GRB 240529A: Swift detection of a burst with an optical counterpart
  17. Swift GRB240529.12: Global MASTER-Net observations report
  18. LIGO/Virgo/KAGRA S240527fv: Updated Sky localization
  19. GRB 240527B: Fermi GBM Observation
  20. Fermi GRB 240527A: Global MASTER-Net observations report
  21. LIGO/Virgo/KAGRA S240527fv: Identification of a GW compact binary merger candidate
  22. GRB 240527B: Fermi-LAT detection
  23. LAT GRB240527.59: Global MASTER-Net observations report
  24. LIGO/Virgo/KAGRA S240527en: Identification of a GW compact binary merger candidate
  25. Fermi GRB 240527B: Global MASTER-Net observations report
  26. GRB 240527B: Fermi GBM Final Localization
  27. GRB 240527B: BALROG localization (Fermi Trigger 738511436 / GRB 240527586)
  28. GRB 240527A: Fermi GBM Final Real-time Localization
  29. GRB 240523A: Swift-BAT refined analysis
  30. Fermi trigger No 738348224: Global MASTER-Net observations report
  31. Fermi trigger No 738330463: Global MASTER-Net observations report
  32. LIGO/Virgo/KAGRA S240525p: Updated Sky localization
  33. LIGO/Virgo/KAGRA S240525p: Identification of a GW compact binary merger candidate
  34. GRB 240523A: Swift-XRT refined Analysis
  35. GRB 240523A: Enhanced Swift-XRT position
  36. GRB 240523A: Swift detection of a burst
  37. GRB 240521B: Fermi GBM Observation
  38. Fermi GBM Sub-Threshold Detection of GRB 240516B
  39. GRB 240513A: Swift-XRT afterglow detection
  40. GRB 240521B: Swift/BAT-GUANO arcminute localization of a long burst
  41. Fermi trigger No 737996942: Global MASTER-Net observations report
  42. LIGO/Virgo/KAGRA S240520cv: Updated Sky localization and EM Bright Classification
  43. EP240518a: GSP optical upper limit
  44. GRB 240521A: GECAM-B detection of a long burst
  45. GRB 240516B: AstroSat CZTI detection
  46. LIGO/Virgo/KAGRA S240515m: Upper limits from Swift/BAT-GUANO
  47. LIGO/Virgo/KAGRA S240514x: Upper limits from Swift/BAT-GUANO
  48. LIGO/Virgo/KAGRA S240513ei: Upper limits from Swift/BAT-GUANO
  49. LIGO/Virgo/KAGRA S240520cv: Identification of a GW compact binary merger candidate
  50. IceCube-Cascade 240518A: Upper limits from a search for additional neutrino events in IceCube
  51. GRB 240514B: VZLUSAT-2 detection
  52. GRB 240504A: VZLUSAT-2 detection
  53. GRB 240502A: VZLUSAT-2 detection
  54. GRB 240519A: GRBAlpha detection
  55. GRB 240516A: Swift/UVOT Upper Limits
  56. GRB 240519A: AstroSat CZTI detection
  57. Fermi trigger No 737788024: Global MASTER-Net observations report
  58. EP240518a: possibly identified with a flare star by EP-FXT
  59. GRB 240519A: BALROG localization (Fermi Trigger 737788024 / GRB 240519213)
  60. EP240518a: EP-WXT detection of a new X-ray transient
  61. LIGO/Virgo/KAGRA S240514c: Updated Sky localization
  62. GRB 240516A: Swift-BAT refined analysis
  63. Fermi GRB 240517A: Global MASTER-Net observations report
  64. GRB 240516A ATCA radio observations
  65. IPN triangulation of GRB 240514B (short)
  66. GRB 240513A: Swift ToO observations
  67. GRB 240517A: Fermi GBM Final Real-time Localization
  68. Konus-Wind detection of GRB 240513A
  69. GRB 240516A: AstroSat CZTI detection
  70. GRB 240516A: Swift-XRT refined Analysis
  71. GRB 240514E: A possible candidate BD-21 1074
  72. Fermi trigger No 737559855: Global MASTER-Net observations report
  73. GRB 240516A: Fermi GBM Observation
  74. GRB 240511A: Observations from GTC/OSIRIS+
  75. GRB 240502C: Zeiss-1000 at Koshka observations of GOTO24bao optical counterpart candidate
  76. GRB 240516A: GOTO optical upper limit
  77. LIGO/Virgo/KAGRA S240422ed: GRID non-detection and upper limits
  78. Fermi trigger No 737523389: Global MASTER-Net observations report
  79. GRB 240516A: Swift detection of a burst
  80. Swift GRB240516.15: Global MASTER-Net observations report
  81. GRB 240514B: AT2024ixa/GOTO24bph is not consistent with the Fermi localisation
  82. Fermi trigger No 737476171: Global MASTER-Net observations report
  83. GRB 240511A: radio detection of afterglow candidate
  84. GRB 240514B: GOTO candidate optical counterpart
  85. MAXI GRB240514.78: Global MASTER-Net observations report
  86. Fermi Gamma-ray Burst Monitor list of triggers that are not a GRB
  87. GRB 240514E: MAXI/GSC detection of a probable afterglow
  88. GRB 240514B: GRBAlpha detection
  89. LIGO/Virgo/KAGRA S240514x: Updated Sky localization
  90. LIGO/Virgo/KAGRA S240515m: Identification of a GW compact binary merger candidate
  91. GRB 240514B: Fermi GBM Detection
  92. LIGO/Virgo/KAGRA S240422ed: Las Cumbres Observatory Follow-up Observations of the Localization Region
  93. GRB 240513A: Fermi GBM observation
  94. GRB 240513A: Swift-XRT observations
  95. LIGO/Virgo/KAGRA S240513ei: Updated Sky localization
  96. LIGO/Virgo/KAGRA S240514x: Identification of a GW compact binary merger candidate
  97. GRB 240514D: AstroSat CZTI detection
  98. GRB 240514C: Fermi GBM Final Real-time Localization
  99. LIGO/Virgo/KAGRA S240514c: Identification of a GW compact binary merger candidate
  100. Fermi GRB 240514B: Global MASTER-Net observations report

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