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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"

12400 results found.

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

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