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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"

24541 results found.

  1. GRB 231115A: Upper limits from a neutrino search with IceCube
  2. GRB 231115A: Kinder observations with Lulin observatory
  3. GRB231115A: GRANDMA Observations
  4. GRB 231115A: Non-detection in low-latency of gravitational waves with LIGO/Virgo/KAGRA
  5. GRB 231115A: pre-burst ZTF upper limits for GRB optical counterpart candidate
  6. GRB 231106A: TESS identification of candidate optical counterpart
  7. GRB 231115A: MASTER optical observations
  8. GRB 231115A: Fermi Observations of a probable Magnetar Giant Flare from M82
  9. Integral GRB231115.65: Global MASTER-Net observations report
  10. Fermi GRB 231115A: Global MASTER-Net observations report
  11. GRB 231115A: significance of INTEGRAL localization alignment with M82
  12. GRB 231115A: Fermi GBM Final Real-time Localization
  13. LIGO/Virgo/KAGRA S231113bw: Updated Sky localization, EM Bright Classification, and Source Classification
  14. GRB 231111A: Swift-BAT refined analysis
  15. LIGO/Virgo/KAGRA S231113bw: Zwicky Transient Facility observations
  16. LIGO/Virgo/KAGRA S231114n: Updated Sky localization
  17. Fermi GRB 231114A: Global MASTER-Net observations report
  18. GRB 231113A (short): Glowbug gamma-ray detection
  19. GECAM-B observation of a short burst from SGR J1555-5402
  20. GRB 231114A: Fermi GBM Final Localization
  21. LIGO/Virgo S231113bw: upper limits from AGILE/MCAL
  22. LIGO/Virgo/KAGRA S231114n: Identification of a GW compact binary merger candidate
  23. SGRJ1555-5402: Swift/BAT-GUANO arcminute localization of a SGR flare
  24. LIGO/Virgo/KAGRA S231113bw: Upper limits from Fermi-GBM Observations
  25. GRB 231110A: CALET Gamma-Ray Burst Monitor detection
  26. LIGO/Virgo/KAGRA S231113cd: Coverage and upper limits from MAXI/GSC observations
  27. LIGO/Virgo/KAGRA S231113bb: Updated Sky localization
  28. LIGO/Virgo/KAGRA S231113bw: Coverage and upper limits from MAXI/GSC observations
  29. LIGO/Virgo/KAGRA S231113bw: Identification of a GW compact binary merger candidate
  30. GRB 231110A: Swift-BAT refined analysis
  31. LIGO/Virgo/KAGRA S231113bb: Identification of a GW compact binary merger candidate
  32. GRB 231111A: Afterglow redshift from OSIRIS+/GTC
  33. GRB 231104A: VZLUSAT-2 detection
  34. GRB 231111A NUTTelA-TAO / BSTI Early Measurements
  35. GRB231111A: Optical follow-up observations with Mephisto
  36. GRB 231106B: GRBAlpha detection
  37. GRB 231111A: Swift-XRT refined Analysis
  38. GRB 231111A: GECAM-C detection of a long burst (correction)
  39. GRB 231110A: GECAM-B detection (correction)
  40. GRB 231111A: GECAM-C detection of a long burst
  41. GRB 231110A: GECAM detection
  42. GRB 231110A: Swift-XRT afterglow detection
  43. GRB 231111A: MASTER OT earlier detection
  44. Swift GRB231111.60: Global MASTER-Net observations report
  45. Swift GRB231110.89: Global MASTER-Net observations report
  46. GRB 231110A: Swift detection of a burst
  47. LIGO/Virgo/KAGRA S231110g: Updated Sky localization
  48. LIGO/Virgo/KAGRA S231110g: Identification of a GW compact binary merger candidate
  49. GRB 231109A: Fermi GBM Final Localization
  50. IceCube-231103A: No candidates from the Zwicky Transient Facility
  51. LIGO/Virgo/KAGRA S231108u: Updated Sky localization
  52. Fermi trigger No 721204446: Global MASTER-Net observations report
  53. Fermi GRB 231108A: Global MASTER-Net observations report
  54. GRB 231108A: Fermi GBM Final Real-time Localization
  55. LIGO/Virgo/KAGRA O4 Landscape
  56. LIGO/Virgo/KAGRA S231108u: Identification of a GW compact binary merger candidate
  57. GRB 231106A: CALET Gamma-Ray Burst Monitor detection
  58. GRB 231104A: Swift-BAT refined analysis
  59. Fermi trigger No 721006392: Global MASTER-Net observations report
  60. GRB 231104A: FRAM-ORM optical limit
  61. LIGO/Virgo/KAGRA S231102w: Upper limits from Swift/BAT-GUANO
  62. Fermi GRB 231106A: Global MASTER-Net observations report
  63. GRB 231104A: NuSTAR Observation of the prompt emission
  64. GRB 231106A: Fermi GBM Final Real-time Localization
  65. GRB 231104A: 3.6m DOT optical upper limit
  66. IceCube-231103A: Upper limits from a search for additional neutrino events in IceCube
  67. LIGO/Virgo/KAGRA S231106y: one counterpart neutrino candidate from IceCube neutrino searches
  68. Fermi-LAT gamma-ray observations of IceCube-231103A
  69. GRB 231104A: Fermi GBM Observation
  70. GRB 231104B: Fermi GBM Final Real-time Localization
  71. Fermi GRB 231103A: Global MASTER-Net observations report
  72. LIGO/Virgo/KAGRA S231104ac: Updated Sky localization
  73. GRB 231104A: AKO Upper Limit
  74. GRB 231104A: AstroSat CZTI detection
  75. GRB 231104A: Swift-XRT refined Analysis
  76. GRB 231104A: Fermi-LAT detection
  77. LIGO/Virgo/KAGRA S231104ac: Identification of a GW compact binary merger candidate
  78. GRB231104A: LCOGT Optical Upper Limits
  79. GRB 231104A: Fermi GBM Final Real-time Localization
  80. Swift GRB231104.07: Global MASTER-Net observations report
  81. IceCube Alert 231103.39: Global MASTER-Net observations report
  82. GRB 231103A: Fermi GBM Final Real-time Localization
  83. IceCube-231103A - IceCube observation of a high-energy neutrino candidate track-like event
  84. Fermi-LAT gamma-ray observations of IceCube-231027A
  85. LIGO/Virgo/KAGRA S231102w: Updated Sky localization
  86. LIGO/Virgo/KAGRA S231102i: Global MASTER-Net observations report
  87. GRB 231024A: GRANDMA observations of AT2023vuc/GOTO23baj candidate
  88. LIGO/Virgo/KAGRA S231102w: Identification of a GW compact binary merger candidate
  89. New Swift-BAT/GUANO and IceCube Notices Available via GCN Kafka
  90. Fermi trigger No 720498201: Global MASTER-Net observations report
  91. GRB 231101A: Fermi GBM Final Real-time Localization
  92. GRB 231030B: GRBAlpha detection
  93. GRB 231028B: VZLUSAT-2 detection
  94. Fermi trigger No 720415645: Global MASTER-Net observations report
  95. GRB 231030B: Fermi GBM Detection
  96. Fermi GRB 231030B: Global MASTER-Net observations report
  97. IPN triangulation of GRB 231020A
  98. GRB 231030B: BALROG localization (Fermi Trigger 720388704 / GRB 231030832)
  99. GRB 231030B: Fermi GBM Final Real-time Localization
  100. GRB 231028A: Swift-BAT refined analysis

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