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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"

39250 results found.

  1. GRB 240527B: Fermi GBM Final Localization
  2. GRB 240527B: BALROG localization (Fermi Trigger 738511436 / GRB 240527586)
  3. GRB 240527A: Fermi GBM Final Real-time Localization
  4. GRB 240523A: Swift-BAT refined analysis
  5. Fermi trigger No 738348224: Global MASTER-Net observations report
  6. Fermi trigger No 738330463: Global MASTER-Net observations report
  7. GRB 240523A: Swift-XRT refined Analysis
  8. GRB 240523A: Enhanced Swift-XRT position
  9. GRB 240523A: Swift detection of a burst
  10. GRB 240521B: Fermi GBM Observation
  11. Fermi GBM Sub-Threshold Detection of GRB 240516B
  12. GRB 240513A: Swift-XRT afterglow detection
  13. GRB 240521B: Swift/BAT-GUANO arcminute localization of a long burst
  14. Fermi trigger No 737996942: Global MASTER-Net observations report
  15. EP240518a: GSP optical upper limit
  16. GRB 240521A: GECAM-B detection of a long burst
  17. GRB 240516B: AstroSat CZTI detection
  18. LIGO/Virgo/KAGRA S240515m: Upper limits from Swift/BAT-GUANO
  19. LIGO/Virgo/KAGRA S240514x: Upper limits from Swift/BAT-GUANO
  20. LIGO/Virgo/KAGRA S240513ei: Upper limits from Swift/BAT-GUANO
  21. GRB 240514B: VZLUSAT-2 detection
  22. GRB 240504A: VZLUSAT-2 detection
  23. GRB 240502A: VZLUSAT-2 detection
  24. GRB 240519A: GRBAlpha detection
  25. GRB 240516A: Swift/UVOT Upper Limits
  26. GRB 240519A: AstroSat CZTI detection
  27. Fermi trigger No 737788024: Global MASTER-Net observations report
  28. EP240518a: possibly identified with a flare star by EP-FXT
  29. GRB 240519A: BALROG localization (Fermi Trigger 737788024 / GRB 240519213)
  30. GRB 240516A: Swift-BAT refined analysis
  31. Fermi GRB 240517A: Global MASTER-Net observations report
  32. GRB 240516A ATCA radio observations
  33. IPN triangulation of GRB 240514B (short)
  34. GRB 240513A: Swift ToO observations
  35. GRB 240517A: Fermi GBM Final Real-time Localization
  36. Konus-Wind detection of GRB 240513A
  37. GRB 240516A: AstroSat CZTI detection
  38. GRB 240516A: Swift-XRT refined Analysis
  39. GRB 240514E: A possible candidate BD-21 1074
  40. Fermi trigger No 737559855: Global MASTER-Net observations report
  41. GRB 240516A: Fermi GBM Observation
  42. GRB 240511A: Observations from GTC/OSIRIS+
  43. GRB 240502C: Zeiss-1000 at Koshka observations of GOTO24bao optical counterpart candidate
  44. GRB 240516A: GOTO optical upper limit
  45. LIGO/Virgo/KAGRA S240422ed: GRID non-detection and upper limits
  46. Fermi trigger No 737523389: Global MASTER-Net observations report
  47. GRB 240516A: Swift detection of a burst
  48. Swift GRB240516.15: Global MASTER-Net observations report
  49. GRB 240514B: AT2024ixa/GOTO24bph is not consistent with the Fermi localisation
  50. Fermi trigger No 737476171: Global MASTER-Net observations report
  51. GRB 240511A: radio detection of afterglow candidate
  52. GRB 240514B: GOTO candidate optical counterpart
  53. MAXI GRB240514.78: Global MASTER-Net observations report
  54. Fermi Gamma-ray Burst Monitor list of triggers that are not a GRB
  55. GRB 240514E: MAXI/GSC detection of a probable afterglow
  56. GRB 240514B: GRBAlpha detection
  57. GRB 240514B: Fermi GBM Detection
  58. GRB 240513A: Fermi GBM observation
  59. GRB 240513A: Swift-XRT observations
  60. GRB 240514D: AstroSat CZTI detection
  61. GRB 240514C: Fermi GBM Final Real-time Localization
  62. Fermi GRB 240514B: Global MASTER-Net observations report
  63. transient: Xinglong Nearby Galaxy Supernova Survey detection of AT2024iss
  64. GRB 240514B: Fermi GBM Final Real-time Localization
  65. LIGO/Virgo/KAGRA S240507p: Upper limits from Swift/BAT-GUANO
  66. LIGO/Virgo/KAGRA S240505av: Upper limits from Swift/BAT-GUANO
  67. LIGO/Virgo/KAGRA S240505av: Upper limits from Swift/BAT-GUANO
  68. GRB 240514A: Fermi GBM Final Real-time Localization
  69. GRB 240513A: Tiled Swift observations
  70. LAT GRB240513.31: Global MASTER-Net observations report
  71. GRB 240513A: Fermi-LAT detection
  72. GRB 240511A: Fermi GBM Observation
  73. GRB 240511A: Swift-BAT refined analysis
  74. Fermi GRB 240513B: Global MASTER-Net observations report
  75. Fermi trigger No 737277727: Global MASTER-Net observations report
  76. GRB 240513B: Fermi GBM Final Real-time Localization
  77. GRB 240513A: AstroSat CZTI detection
  78. Fermi trigger No 737258655: Global MASTER-Net observations report
  79. GRB 240511A: J-band observations with WINTER
  80. Fermi trigger No 737247400: Global MASTER-Net observations report
  81. Fermi trigger No 737244199: Global MASTER-Net observations report
  82. Fermi trigger No 737218721: Global MASTER-Net observations report
  83. Fermi trigger No 737196587: Global MASTER-Net observations report
  84. Fermi trigger No 737168073: Global MASTER-Net observations report
  85. GRB 240511A: Enhanced Swift-XRT position
  86. GRB 240511A : MITSuME Akeno optical upper limits
  87. GRB 240511A: Swift-XRT refined Analysis
  88. GRB 240511A: optical afterglow detection from the NOT
  89. Fermi Gamma-ray Burst Monitor trigger 737102480/240511279 is not a GRB
  90. Fermi Gamma-ray Burst Monitor trigger 737111207/240511380 is not a GRB
  91. Fermi GBM trigger 737105243/240511311 is not a GRB
  92. Fermi trigger No 737173236: Global MASTER-Net observations report
  93. Fermi GRB 240511A: Global MASTER-Net observations report
  94. Swift GRB 240511A: Global MASTER-Net observations report
  95. Fermi trigger No 737105243: Global MASTER-Net observations report
  96. Fermi Gamma-ray Burst Monitor trigger 737133200/240511634 is not a GRB
  97. Fermi trigger No 737152719: Global MASTER-Net observations report
  98. GRB 240511A: Prompt enhanced Swift-XRT position
  99. GRB 240511A: Swift detection of a burst
  100. GRB 240511A: Fermi GBM Final Real-time Localization

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