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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"

45828 results found.

  1. GRB 240112D: Glowbug gamma-ray detection
  2. GRB 240112C: Glowbug gamma-ray detection
  3. GRB 240112C: VZLUSAT-2 detection
  4. GRB 240107A: VZLUSAT-2 detection
  5. Integral GRB240115.70: Global MASTER-Net observations report
  6. Fermi GRB 240115B: Global MASTER-Net observations report
  7. GRB 240115B: A long GRB detected by INTEGRAL
  8. GRB 240115B: Fermi GBM Final Real-time Localization
  9. Konus-Wind detection of GRB 240112C
  10. Fermi GRB 240115A: Global MASTER-Net observations report
  11. GRB 240115A: Fermi GBM Final Real-time Localization
  12. GRB 240112C: GRBAlpha detection
  13. GRB 240114A: MAXI/GSC detection
  14. GRB 240112C: Swift/UVOT Detection
  15. GRB 240112C: Fermi GBM Detection
  16. Fermi trigger No 726773850: Global MASTER-Net observations report
  17. GRB 240112C: Swift-XRT refined Analysis
  18. GRB 240112C: SAO RAS optical observations
  19. GRB 240112E: Fermi GBM Final Localization
  20. Fermi GRB 240112D: Global MASTER-Net observations report
  21. GRB 240112D: Fermi GBM Final Real-time Localization
  22. Fermi trigger No 726774492: Global MASTER-Net observations report
  23. Swift GRB 240112C: Global MASTER-Net observations report
  24. Fermi GRB 240112B: Global MASTER-Net observations report
  25. GRB 240109A: Swift-BAT refined analysis
  26. GRB 240112C: Swift detection of a burst with an optical counterpart
  27. GRB 240112B: Fermi GBM Final Real-time Localization
  28. GRB 240112A: GECAM detection of a burst
  29. GRB 240109A: Fermi GBM Observation
  30. GRB 240110A: AstroSat CZTI detection
  31. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region
  32. GRB 240108A: Glowbug gamma-ray detection
  33. GRB 231214A: ATCA Radio Upper Limits
  34. GRB 240106B: Glowbug gamma-ray detection
  35. GRB 240106A: Glowbug gamma-ray detection
  36. IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube
  37. GRB 240109B: Fermi GBM Final Real-time Localization
  38. IceCube-240105A: Three candidates from the Zwicky Transient Facility
  39. LIGO/Virgo/KAGRA S240109a: Updated Sky localization
  40. Konus-Wind detection of GRB 240101C
  41. GRB 231215A: radio detection with the VLA
  42. GRB 230818A: further radio observations with the VLA
  43. GRB 230812B: further radio observations with the VLA
  44. Swift GRB240109.17: Global MASTER-Net observations report
  45. GRB 240107A: AstroSat CZTI detection
  46. LIGO/Virgo/KAGRA S240109a: Identification of a GW compact binary merger candidate
  47. GRB 240109A: Swift detection of a short burst
  48. LIGO/Virgo/KAGRA S240104bl: Upper limits from Swift/BAT-GUANO
  49. IceCube-240105A: JCMT SCUBA2 Detection of Two Bright Submillimeter Sources
  50. Update of IceCube-240105A - Corrected errors
  51. GRB 240106A: GRBAlpha detection
  52. LIGO/Virgo/KAGRA S240107b: Updated Sky localization and Source Classification
  53. GRB 240107A: MAXI/GSC detection
  54. Fermi trigger No 726347794: Global MASTER-Net observations report
  55. LIGO/Virgo/KAGRA S240107b: Identification of a GW compact binary merger candidate
  56. GRB 240106B: Fermi GBM Final Real-time Localization
  57. Fermi trigger No 726194053: Global MASTER-Net observations report
  58. GRB 240106A: Fermi GBM Final Real-time Localization
  59. IPN triangulation of GRB 240101C (short)
  60. GRB GRB240101C: Fermi GBM observation
  61. IceCube Alert 240105.52: Global MASTER-Net observations report
  62. GRB 240101A: 1.3m DFOT optical observations
  63. IceCube-240105A - IceCube observation of a high-energy neutrino candidate track-like event
  64. GRB 240102A: 1.3m DFOT optical upper limit
  65. GRB 240101B: 1.3m DFOT optical upper limit
  66. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  67. LIGO/Virgo/KAGRA S240104bl: Updated Sky localization
  68. LIGO/Virgo/KAGRA S240104bl: Identification of a GW compact binary merger candidate
  69. GRB 240102C: AstroSat CZTI detection
  70. GRB 240101C: AstroSat CZTI detection
  71. GRB 231220A: Swift-UVOT upper limit
  72. GRB 240102A: Swift-BAT refined analysis
  73. GRB 240102A: Swift/UVOT Upper Limits
  74. GRB 231230A: Swift-BAT refined analysis
  75. GRB 240101A: Swift-BAT refined analysis
  76. GRB 240101B: Swift-BAT refined analysis
  77. GRB 240102A: Enhanced Swift-XRT position
  78. GRB 240101B: Swift-XRT refined Analysis
  79. GRB 240102A: Swift-XRT refined Analysis
  80. GRB 240102B (Fermi GBM trigger 725926335/240102925) is not a GRB
  81. GRB 240102A: LCOGT Optical Upper Limits
  82. Fermi trigger No 725857207: Global MASTER-Net observations report
  83. GRB240102A: BOOTES-6/DPRT optical upper limit
  84. GRB 240102B: Fermi GBM Final Real-time Localization
  85. GRB 240101B: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT
  86. IceCube-Cascade 231230A: Upper limits from a search for additional neutrino events in IceCube
  87. GRB 240102A: Swift detection of a burst
  88. GRB 240101A: Terskol Zeiss-2000 optical observations
  89. GRB 240101C: GRBAlpha detection
  90. GRB 240101B: Swift/UVOT Upper Limits
  91. GRB 240101A: Swift/UVOT Upper Limits
  92. GRB 240101A: Swift-XRT refined Analysis
  93. GRB 240101B: Enhanced Swift-XRT position
  94. GRB 240101B: KAIT Optical Upper Limit
  95. GRB 240101A: KAIT Optical Upper Limit
  96. GRB 240101A: Enhanced Swift-XRT position
  97. GRB 240101C: Fermi GBM Final Localization
  98. Swift GRB240101.85: Global MASTER-Net observations report
  99. GRB 240101B: Swift detection of a burst
  100. GRB 240101A: Swift detection of a burst

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