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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"

23727 results found.

  1. Swift GRB240109.17: Global MASTER-Net observations report
  2. GRB 240109A: Swift detection of a short burst
  3. IceCube-240105A: JCMT SCUBA2 Detection of Two Bright Submillimeter Sources
  4. GRB 240106A: GRBAlpha detection
  5. GRB 240107A: MAXI/GSC detection
  6. Fermi trigger No 726347794: Global MASTER-Net observations report
  7. LIGO/Virgo/KAGRA S240107b: Identification of a GW compact binary merger candidate
  8. GRB 240106B: Fermi GBM Final Real-time Localization
  9. Fermi trigger No 726194053: Global MASTER-Net observations report
  10. GRB 240106A: Fermi GBM Final Real-time Localization
  11. IPN triangulation of GRB 240101C (short)
  12. GRB GRB240101C: Fermi GBM observation
  13. IceCube Alert 240105.52: Global MASTER-Net observations report
  14. GRB 240102A: Swift-BAT refined analysis
  15. GRB 231230A: Swift-BAT refined analysis
  16. GRB 240101A: Swift-BAT refined analysis
  17. GRB 240101B: Swift-BAT refined analysis
  18. Fermi trigger No 725857207: Global MASTER-Net observations report
  19. GRB240102A: BOOTES-6/DPRT optical upper limit
  20. GRB 240102A: Swift detection of a burst
  21. GRB 240101C: GRBAlpha detection
  22. GRB 240101B: Swift/UVOT Upper Limits
  23. GRB 240101A: Swift/UVOT Upper Limits
  24. GRB 240101B: KAIT Optical Upper Limit
  25. GRB 240101A: KAIT Optical Upper Limit
  26. Swift GRB240101.85: Global MASTER-Net observations report
  27. Fermi trigger No 725806648: Global MASTER-Net observations report
  28. GRB 231230A: GOTO optical upper limits
  29. GRB 231230A: Swift/UVOT Upper Limits
  30. Fermi trigger No 725592555: Global MASTER-Net observations report
  31. GRB 231230A: Swift detection of a burst
  32. Swift GRB231230.06: Global MASTER-Net observations report
  33. IPN triangulation of GRB 231224A (short)
  34. LIGO/Virgo/KAGRA S231226av: Identification of a GW compact binary merger candidate
  35. Fermi trigger No 725143760: Global MASTER-Net observations report
  36. GRB 231222B: GRBAlpha detection
  37. GRB 231222B: Swift-XRT afterglow detection
  38. LIGO/Virgo/KAGRA S231223j: Identification of a GW compact binary merger candidate
  39. Fermi trigger No 724921799: Global MASTER-Net observations report
  40. LAT GRB231222.31: Global MASTER-Net observations report
  41. GRB 231222B: Fermi-LAT detection
  42. IceCube-231211A: GRANDMA observations of PKS2047+098
  43. GRB 231220A: Swift-XRT follow-up observations
  44. Fermi trigger No 724781422: Global MASTER-Net observations report
  45. Fermi trigger No 724698747: Global MASTER-Net observations report
  46. GRB 231216A: 10.4 m GTC optical upper limit
  47. GRB 231216A: Nanshan/HMT optical upper limit
  48. GRB 231216A: Swift-XRT refined Analysis
  49. GRB 231216A: REM NIR upper limits
  50. GRB 231216A: Swift/UVOT Upper Limits
  51. GRB 231216A: Swift-BAT refined analysis
  52. GRB 231215A: Swift-BAT refined analysis
  53. GRB 231214A: Swift-BAT refined analysis
  54. GRB 231216A: BOOTES-2/TELMA optical upper limit
  55. GRB 231215A: GRBAlpha detection
  56. Swift GRB231216.77: Global MASTER-Net observations report
  57. GRB 231216A: Swift detection of a burst
  58. Konus-Wind detection of GRB 231215A
  59. GRB 231215A: NOT optical observations
  60. GRB 231215A: Redshift from OSIRIS+ / GTC
  61. GRB 231205B: VZLUSAT-2 detection
  62. GRB 231204A: VZLUSAT-2 detection
  63. GRB 231215A: CALET Gamma-Ray Burst Monitor detection
  64. GRB 231215A: Swift/UVOT Detection
  65. LIGO/Virgo/KAGRA S231215i: 3 counterpart neutrino candidate events from an IceCube neutrino search
  66. GRB 231215A: BOOTES-4/MET optical detection
  67. GRB 231215A: AGILE detection
  68. Konus-Wind detection of GRB 231210B
  69. Fermi trigger No 724326442: Global MASTER-Net observations report
  70. GRB 231214A: REM optical/NIR upper limits
  71. GRB 231215A: GROWTH-India optical follow-up
  72. GRB 231215A : Nanshan/HMT optical observations
  73. GRB 231215A: AstroSat CZTI detection
  74. GRB 231215A : MITSuME Akeno optical afterglow candidate detection
  75. GRB 231214A: Swift-XRT refined Analysis
  76. GRB 231215C: MASTER OT detection
  77. Swift GRB231215.41: Global MASTER-Net observations report
  78. GRB 231215A: Swift detection of a burst
  79. GRB 231214A: Fermi-LAT detection
  80. GRB231214A: BOOTES-6/DPRT optical upper limit
  81. Fermi trigger No 724278269: Global MASTER-Net observations report
  82. Fermi trigger No 724233240: Global MASTER-Net observations report
  83. Swift GRB231214.85: Global MASTER-Net observations report
  84. GRB 231214A: Swift detection of a burst
  85. GRB 231210B: REM optical/NIR upper limits
  86. LIGO/Virgo/KAGRA S231213ap: Identification of a GW compact binary merger candidate
  87. Fermi trigger No 724035412: Global MASTER-Net observations report
  88. GRB 231210B: MeerLICHT afterglow observations
  89. GRB 231210B: Swift-BAT refined analysis
  90. IceCube Alert 231211.03: Global MASTER-Net observations report
  91. GRB 231210B: Swift-XRT refined Analysis
  92. GRB 231210B: detection of the optical counterpart with the LCOGT 40cm telescope at Sutherland Observatory
  93. Fermi trigger No 723906955: Global MASTER-Net observations report
  94. GRB 231210B: Swift detection of a burst with optical counterpart
  95. Swift GRB231210.90: Global MASTER-Net OT detection
  96. Swift GRB231210.90: Global MASTER-Net observations report
  97. IPN triangulation of GRB 231129C
  98. GRB 231208A: GRBAlpha detection
  99. GRB231205B: Swift/UVOT Upper Limits
  100. GRB 231208A: Glowbug gamma-ray detection

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