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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"

38417 results found.

  1. GRB 260924A: Swift-XRT refined Analysis
  2. Konus-Wind detection of GRB 260922A
  3. GRB 260922A: NuSTAR detection of prompt emission
  4. GRB 260921A: NuSTAR detection of prompt emission
  5. Konus-Wind detection of GRB 260921A (correction to GCN 45722)
  6. GRB 260921A: SVOM/GRM observation
  7. GRB 260922A: COLIBRÍ Confirmation of the Optical Counterpart
  8. GRB 260924A: Fermi GRB Observation
  9. Konus-Wind detection of GRB 260921A (possible merger-origin)
  10. GRB 260924A: Fermi-LAT detection of a bright burst
  11. GRB 260924A: AstroSat CZTI detection
  12. GRB 260920A: SVOM/GRM observation
  13. GRB 260924A: NOT optical counterpart confirmation
  14. GRB 260924A: detection of a bright optical afterglow by the 1.5m OSN telescope
  15. GRB 260922A: CALET Gamma-Ray Burst Monitor detection
  16. GRB 260924A: Enhanced Swift-XRT position
  17. The EP-WXT trigger 01709319842 is likely a flaring star
  18. GRB 260924A: Swift detection of a burst
  19. GRB 260924A: Fermi GBM Final Real-time Localization
  20. GRB 260923A: Fermi GBM Final Real-time Localization
  21. Trigger_21914: Swift ToO observations
  22. EP260806a: e-MERLIN detection at 5 GHz
  23. Fermi-LAT Gamma-ray Observations of IceCube-260919A
  24. Fermi-LAT Gamma-ray Observations of IceCube-260916A
  25. ATCA observations of GRB 260909A
  26. EP260920a: VLT/HAWK-I near-infrared counterpart confirmation
  27. GRB 260922A: J-band upper limit with WINTER
  28. GRB 260922A: Swift/UVOT Upper Limits
  29. GRB 260922A: COLIBRÍ Optical Counterpart Candidate (correction to GCN 45698)
  30. GRB 260922A: COLIBRÍ optical upper limits
  31. GRB 260922A: Swift-XRT refined Analysis
  32. GRB 260922A: Enhanced Swift-XRT position
  33. Fermi-LAT Gamma-ray Observations of IceCube-260805A
  34. Konus-Wind detection of GRB 260810A
  35. GRB 260920A: Glowbug gamma-ray detection
  36. GRB 260918A: SVOM/ECLAIRs refined analysis
  37. GRB 260922A: SVOM/C-GFT optical upper limit
  38. GRB 260922A: Swift detection of a burst
  39. GRB 260917C: AstroSat CZTI detection
  40. GRB 260920B/EP260920b: GECAM-B detection of a burst
  41. GRB 260921A: AstroSat CZTI detection
  42. GRB 260921B: Fermi GBM Final Localization
  43. GRB 260921A: Fermi GBM Observation
  44. EP260920b: 2.2m CAHA optical afterglow detection and 10.4m GTC redshift confirmation
  45. GRB 260917B:: SVOM/ECLAIRs refined analysis
  46. The EP-WXT trigger 01709319528 is likely a flaring star
  47. EP260920a: VLT/HAWK-I near-infrared candidate
  48. GRB 260921A: Swift detection of a burst
  49. EP260920b: VLT/X-shooter spectroscopic redshift z = 3.582
  50. GRB 260921A: Fermi GBM Final Real-time Localization
  51. EP260920b: LCO observations
  52. GRB 260920A: AstroSat CZTI detection
  53. EP260920b: SVOM/VT optical observation
  54. EP260920b: refined analysis of the EP-WXT and EP-FXT observations
  55. EP260920b: COLIBRÍ optical observations
  56. The EP-WXT trigger 01709318601 is likely a flaring star
  57. EP260920b: Einstein Probe detection of an X-ray transient
  58. IceCube-260919A: Upper limits from a search for additional neutrino events in IceCube
  59. EP-WXT detected a brightening of HMXB LS V +44 17
  60. EP260920a: NOT early time optical upper limits
  61. EP260920a: NOT optical upper limits
  62. GRB 260920A: Fermi GBM Final Real-time Localization
  63. EP260920a: SVOM/VT optical upper limits
  64. EP260920a: refined analysis of the EP-WXT and autonomous EP-FXT observations
  65. EP260920a: COLIBRÍ optical upper limits
  66. EP260920a: Update of the LCO optical counterpart candidate
  67. EP260917b: EP-FXT non-detection and upper limit
  68. EP260920a: Einstein Probe detection of an X-ray transient
  69. GRB 260915A: VLT optical and near-infrared upper limits
  70. EP260917a: refined analysis of the EP-FXT observations
  71. IceCube-260919A - IceCube observation of a high-energy neutrino candidate track-like event
  72. The EP-WXT trigger 01709318491 is likely a flaring star
  73. EP260806a: Yamaguchi Interferometer radio detections
  74. EP260917a: SVOM/VT optical upper limits
  75. GRB 260918A: SVOM/C-GFT optical upper limits
  76. Fermi GBM Sub-Threshold Detection of GRB 260918A
  77. SVOM GRB260918.16: Global MASTER-Net observations report
  78. Konus-Wind detection of GRB 260916B (short/hard)
  79. The EP-WXT trigger 01709318279 is likely a flaring star
  80. GRB 260918A: SVOM/VT optical upper limits
  81. GRB 260916B: Glowbug gamma-ray detection of a short burst
  82. GRB 260918A: EP-FXT follow-up observation
  83. GRB 260917B: Mondy optical upper limit
  84. IPN triangulation of GRB 260916B (short)
  85. EP260917b: EP-WXT detection of an X-ray transient
  86. EP260917A: J-band upper limit with WINTER
  87. IPN triangulation of GRB 260810A
  88. GRB 260917B: EP-FXT follow-up observation
  89. EP260917a: COLIBRÍ optical upper limits
  90. GRB 260915A: Swift-XRT afterglow detection
  91. GRB 260918A: LCO optical upper limits
  92. EP260917a: Einstein Probe detection of an X-ray transient
  93. GRB 260918A: SVOM/COLIBRÍ (FM-GFT) optical upper limits
  94. GRB 260918A: SVOM detection of a burst
  95. GRB 260917C: Fermi GBM Final Real-time Localization
  96. GRB 260916B: Fermi GBM Detection
  97. IceCube-260916A: Upper limits from a search for additional neutrino events in IceCube
  98. GRB 260916B: Fermi GBM Final Localization
  99. GRB 260917A: Glowbug gamma-ray detection
  100. GRB 260915A: SVOM/ECLAIRs refined analysis

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