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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"

21093 results found.

  1. Fermi trigger No 729719508: Global MASTER-Net observations report
  2. GRB 240215A: Tiled Swift observations
  3. GRB 240215A: Swift/BAT-GUANO localization of a burst
  4. Fermi trigger No 729703985: Global MASTER-Net observations report
  5. Fermi trigger No 729650855: Global MASTER-Net observations report
  6. GRB 240209A: Classification of AT2024cew/GOTO24pw as Type Ia-pec supernova
  7. GRB 240209A: Fermi GBM observation
  8. The AGILE satellite ceased operations and re-entered today into the atmosphere
  9. The AGILE satellite ceased operations and re-entered today into the atmosphere
  10. GRB240209A: OHP/T193 detection of the GOTO afterglow candidate AT2024cew / GOTO24pw
  11. GRB 240209A: Wendelstein Optical Observations
  12. GRB 240128A: Further Swift-XRT observations
  13. GRB 240214A: Tiled Swift observations
  14. Fermi GRB 240213A: Global MASTER-Net observations report
  15. GRB 240209A: NOEMA non-detection of AT2024cew / GOTO24pw counterpart candidate
  16. GRB 240209A: GOTO optical counterpart candidate
  17. Fermi trigger No 729152364: Global MASTER-Net observations report
  18. Fermi-LAT gamma-ray observations of IceCube-240204A
  19. GRB 240205B: PRIME near infrared detection
  20. GRB240204A: Swift/UVOT Upper Limits
  21. Fermi trigger No 729012023: Global MASTER-Net observations report
  22. GRB 240205B: VLT/X-shooter redshift
  23. GRB 240205B: BOOTES-6 optical afterglow follow-up
  24. GRB 240205B: ATCA detection of radio counterpart
  25. GRB 240205B: REM detection of the optical/NIR afterglow
  26. GRB 240204A: Mondy optical afterglow observations
  27. GRB 240204A : OHP/T193/T120 optical afterglow fading detection
  28. GRB 240205B: Skynet Optical Afterglow Observations
  29. GRB 240205B: BOOTES-7 optical afterglow follow-up
  30. Fermi trigger No 728749569: Global MASTER-Net observations report
  31. GRB 240205B: MASTER OT J232550.14-550704.6 counterpart detection
  32. GRB 240205B: Swift detection of a burst
  33. Swift GRB240205.93: Global MASTER-Net observations report
  34. GRB 240204a: Liverpool Telescope optical afterglow detection
  35. GRB 240204A: Osservatorio Astronomico Nastro Verde upper limit
  36. Fermi trigger No 728796365: Global MASTER-Net observations report
  37. GRB 240204A: Montarrenti Observatory optical observations
  38. Fermi GRB 240204A: Global MASTER-Net observations report
  39. Fermi trigger No 728706420: Global MASTER-Net observations report
  40. IceCube Alert 240204.38: Global MASTER-Net observations report
  41. GRB 240128A: Swift-XRT observations
  42. GRB 240128A: Tiled Swift observations
  43. Fermi GRB 240127A: Global MASTER-Net observations report
  44. GRB 240122A: ATCA detection of radio counterpart
  45. GRB240122A: PRIME near infrared detection
  46. Fermi-LAT gamma-ray observations of IceCube-240123A
  47. GRB 240123A: further SAO RAS optical observations
  48. IceCube Alert 240123.48: Global MASTER-Net observations report
  49. GRB 240123A: Mondy continued optical observations and the PL decay index
  50. GRB 240123A: SAO RAS optical observations
  51. Fermi GRB 240123B: Global MASTER-Net observations report
  52. GRB 240122A: Swift/UVOT Upper Limits
  53. GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605
  54. GRB 240118A: Swift/UVOT Upper Limits
  55. GRB 240123A: Mondy optical afterglow observations
  56. Swift GRB240123.46: Global MASTER-Net observations report
  57. GRB 240122A: Swift-XRT afterglow detection
  58. GRB 240122A: VLT/X-shooter redshift confirmation
  59. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
  60. GRB 240122A: GOTO optical counterpart candidate
  61. GRB 240122A: Tiled Swift observations
  62. GRB 240118A: Mondy optical observations
  63. GRB 240118A: Swift-XRT afterglow detection
  64. Fermi GRB 240119A: Global MASTER-Net observations report
  65. IceCube-240105A: Detection of NIR flare of PKS 0446+11 with WINTER
  66. GRB 240118A: Swift ToO observations
  67. Fermi GRB 240118B: Global MASTER-Net observations report
  68. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A
  69. LAT GRB240118.08: Global MASTER-Net observations report
  70. Integral GRB240115.70: Global MASTER-Net observations report
  71. Fermi GRB 240115B: Global MASTER-Net observations report
  72. Fermi GRB 240115A: Global MASTER-Net observations report
  73. GRB 240112C: Swift/UVOT Detection
  74. Fermi trigger No 726773850: Global MASTER-Net observations report
  75. GRB 240112C: SAO RAS optical observations
  76. Fermi GRB 240112D: Global MASTER-Net observations report
  77. Fermi trigger No 726774492: Global MASTER-Net observations report
  78. Swift GRB 240112C: Global MASTER-Net observations report
  79. Fermi GRB 240112B: Global MASTER-Net observations report
  80. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region
  81. GRB 231214A: ATCA Radio Upper Limits
  82. IceCube-240105A: Three candidates from the Zwicky Transient Facility
  83. GRB 231215A: radio detection with the VLA
  84. GRB 230818A: further radio observations with the VLA
  85. GRB 230812B: further radio observations with the VLA
  86. Swift GRB240109.17: Global MASTER-Net observations report
  87. IceCube-240105A: JCMT SCUBA2 Detection of Two Bright Submillimeter Sources
  88. Fermi trigger No 726347794: Global MASTER-Net observations report
  89. Fermi trigger No 726194053: Global MASTER-Net observations report
  90. IceCube Alert 240105.52: Global MASTER-Net observations report
  91. GRB 240101A: 1.3m DFOT optical observations
  92. GRB 240102A: 1.3m DFOT optical upper limit
  93. GRB 240101B: 1.3m DFOT optical upper limit
  94. GRB 231220A: Swift-UVOT upper limit
  95. GRB 240102A: Swift/UVOT Upper Limits
  96. Fermi trigger No 725857207: Global MASTER-Net observations report
  97. GRB 240101B: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT
  98. GRB 240101A: Terskol Zeiss-2000 optical observations
  99. GRB 240101B: Swift/UVOT Upper Limits
  100. GRB 240101A: Swift/UVOT Upper Limits

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