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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"

12402 results found.

  1. EP240802a: Kinder optical, SWIFT-UVOT, and SWIFT-XRT upper limits 6 days after the WXT detection
  2. Fermi trigger No 745220784: Global MASTER-Net observations report
  3. EP240807a: PRIME H-band upper limits
  4. IceCube-240808A: Upper limits from a search for additional neutrino events in IceCube
  5. GRB 240811A: Bassano Bresciano Observatory upper limit
  6. GRB 240811A: Swift/UVOT Upper Limits
  7. Fermi GRB 240810A: Global MASTER-Net observations report
  8. GRB 240811A: LCOGT Optical Upper Limit
  9. GRB 240811A: Upper limits with Mephisto
  10. Fermi trigger No 745057312: Global MASTER-Net observations report
  11. Swift GRB 240811A: Global MASTER-Net observations report
  12. GRB 240811A: Swift detection of a burst
  13. Fermi-LAT gamma-ray observations of IceCube-240808A
  14. GRB 240809B: MAXI/GSC detection
  15. X-ray Transient EP240807a: PRIME near-infrared upper limits
  16. Swift GRB 240809A: Global MASTER-Net observations report
  17. IceCube Alert 240808.27: Global MASTER-Net observations report
  18. EP EP240807a: Global MASTER-Net observations report
  19. EP EP240806a: Global MASTER-Net observations report
  20. GRB 240805A: ATCA Radio Upper Limits
  21. Fermi trigger No 744761058: Global MASTER-Net observations report
  22. EP240802a/GRB240802A: KAIT optical upper limit
  23. GRB 240805B: GIT optical upper limit
  24. Fermi trigger No 744629911: Global MASTER-Net observations report
  25. GRB 240805B Bassano Bresciano Observatory upper limit
  26. GRB 240805B: JinShan optical afterglow detection
  27. GRB 240805B: AbAO, CrAO, and Terskol optical upper limits
  28. Konus-Wind detection of GRB 240804B (a counterpart of EP240804a)
  29. GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
  30. Fermi trigger No 744544656: Global MASTER-Net observations report
  31. GRB 240805B: Swift/UVOT Upper Limits
  32. GRB 240805A: Swift/UVOT Upper Limits
  33. GRB 240805B: LCOGT Optical Upper Limits
  34. Swift GRB 240805B: Global MASTER-Net observations report
  35. GRB 240805B: JinShan optical upper limits
  36. Fermi GRB 240805A: Global MASTER-Net observations report
  37. Swift GRB 240805A: Global MASTER-Net observations report
  38. GRB 240805B: Swift detection of a burst
  39. Fermi GRB 240804A: Global MASTER-Net observations report
  40. EP240802a: Montarrenti Observatory optical upper limit
  41. Fermi trigger No 744459130: Global MASTER-Net observations report
  42. EP240801a: Osservatorio Astronomico Nastro Verde upper limit
  43. EP240802A: Bassano Bresciano Observatory upper limit
  44. EP240802a: Time coincidence with GRB 240802A and optical upper limits with Kinder observations
  45. Fermi trigger No 744278264: Global MASTER-Net observations report
  46. EP240801a: optical observations at CrAO and AbAO
  47. EP240801a: GRANDMA and Kilonova-Catcher optical observations
  48. Fermi trigger No 744204856: Global MASTER-Net observations report
  49. Fermi GRB 240801A: Global MASTER-Net observations report
  50. Fermi trigger No 744128417: Global MASTER-Net observations report
  51. Fermi trigger No 744083370: Global MASTER-Net observations report
  52. GRB 240730A: Osservatorio Astronomico Nastro Verde upper limit
  53. GRB240730A: BOOTES-5/JGT early optical upper limit
  54. Fermi GRB 240730B: Global MASTER-Net observations report
  55. Swift GRB 240730A: Global MASTER-Net observations report
  56. GRB 240715A: Swift-XRT afterglow detection
  57. GRB 240730A: KAIT Optical Upper Limit
  58. GRB 240730A: Swift/UVOT Upper Limits
  59. Fermi trigger No 743953682: Global MASTER-Net observations report
  60. GRB 240727B: Swift-XRT observations
  61. Fermi GRB 240727A: Global MASTER-Net observations report
  62. GRB 240727A: Swift/UVOT detection
  63. Fermi trigger No 743868421: Global MASTER-Net observations report
  64. GRB 240727A: Osservatorio Astronomico Nastro Verde upper limit
  65. GRB 240727A: JinShan optical upper limits
  66. GRB 240727A Bassano Bresciano Observatory upper limit
  67. Fermi GRB 240726A: Global MASTER-Net observations report
  68. Swift GRB240727.16: Global MASTER-Net observations report
  69. IceCube-240725A: Upper limits from a search for additional neutrino events in IceCube
  70. Fermi-LAT gamma-ray observations of IceCube-240725A
  71. IceCube Alert 240725.22: Global MASTER-Net observations report
  72. Swift Trigger 1244778 is not a GRB
  73. Swift GRB240725.11: Global MASTER-Net observations report
  74. IceCube-240721A: Upper limits from a search for additional neutrino events in IceCube
  75. Fermi trigger No 743418632: Global MASTER-Net observations report
  76. Fermi trigger No 743315411: Global MASTER-Net observations report
  77. LIGO/Virgo/KAGRA S240716b: Upper limits from Swift/BAT-GUANO
  78. LIGO/Virgo/KAGRA S240703ad: Upper limits from Swift/BAT-GUANO
  79. Fermi trigger No 743345551: Global MASTER-Net observations report
  80. Fermi-LAT gamma-ray observations of IceCube-240721A
  81. Fermi trigger No 743219692: Global MASTER-Net observations report
  82. IceCube Alert 240721.68: Global MASTER-Net observations report
  83. Fermi GRB 240720A: Global MASTER-Net observations report
  84. Swift GRB240720.02: Global MASTER-Net observations report
  85. Konus-Wind detection of GRB 240718A
  86. Fermi GRB 240718A: Global MASTER-Net observations report
  87. LAT GRB240718.27: Global MASTER-Net observations report
  88. Fermi-LAT gamma-ray observations of IceCube-cascade-240714A
  89. GRB 240715A: Swift-XRT observations
  90. GRB240713A: Swift/UVOT Upper LImits
  91. EP240708a: X-ray follow-up observations with Swift/XRT
  92. Konus-Wind detection of GRB 240715A
  93. GRB 240713A: Swift-XRT observations
  94. GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
  95. GRB 240713A: LAST optical upper limit
  96. Fermi GRB 240715A: Global MASTER-Net observations report
  97. GRB 240713A: optical upper limits from the INAF Asiago Observatory
  98. GRB 240712A ATCA radio observations
  99. GRB240715A: GRANDMA Optical Upper Limits
  100. GW s240422ed: Swift UVOT follow-up

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