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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"

5173 results found.

  1. GRB 220930A: MITSuME Akeno optical upper limits
  2. GRB 220921A: ATCA detection of radio counterpart
  3. Fermi trigger No 686403226: Global MASTER-Net observations report
  4. Fermi trigger No 686350260: Global MASTER-Net observations report
  5. GRB 220930A: Swift-XRT refined Analysis
  6. GRB 220930A: LCOGT Optical Upper Limits
  7. Swift GRB 220930A: Global MASTER-Net observations report
  8. IceCube-220928A: Upper limits from a search for additional neutrino events in IceCube
  9. GRB 220611A: Host galaxy redshift from VLT/X-shooter
  10. GRB 220924A: Fermi GBM detection
  11. Fermi GRB 220925A: Global MASTER-Net observations report
  12. GRB 220921A: further MeerLICHT observations
  13. Fermi trigger No 685748699: Global MASTER-Net observations report
  14. GRB 220924A: Fermi GBM Final Real-time Localization
  15. Swift GRB220923.47: Global MASTER-Net observations report
  16. GRB 220921A: ALMA detection
  17. GRB 220921A: DDOTI Detection of the Afterglow
  18. GRB 220921A: Swift-XRT Observations
  19. GRB 220921A: MASTER OT inside Fermi-LAT error-box
  20. Fermi trigger No 685452089: Global MASTER-Net observations report
  21. Fermi trigger No 684716840: Global MASTER-Net observations report
  22. Fermi GRB 220912A: Global MASTER-Net observations report
  23. GRB 220912A: AstroSat CZTI detection
  24. GRB 220909A: Swift-XRT observations
  25. Fermi GRB 220902A: Global MASTER-Net observations report
  26. GRB 220831A, VLT/HAWK-I near-infrared observations
  27. Fermi trigger No 683202084: Global MASTER-Net observations report
  28. Fermi trigger No 683183601: Global MASTER-Net observations report
  29. Fermi trigger No 683152759: Global MASTER-Net observations report
  30. GRB 220826A: Swift-XRT refined Analysis
  31. Fermi trigger No 682918137: Global MASTER-Net observations report
  32. GRB 220813A: Swift-XRT refined Analysis
  33. GRB 220813A: Swift detection of a burst with an optical counterpart
  34. Fermi trigger No 681998863: Global MASTER-Net observations report
  35. GRB 220806A: Swift detection of a burst
  36. GRB 220804A: Fermi GBM Final Localization
  37. Fermi trigger No 681212354: Global MASTER-Net observations report
  38. Fermi trigger No 680782656: Global MASTER-Net observations report
  39. Fermi GRB 220728A: Global MASTER-Net observations report
  40. GRB 220724A: Fermi GBM Final Real-time Localization
  41. Fermi GRB 220721A: Global MASTER-Net observations report
  42. GRB 220715B: Fermi GBM detection
  43. GRB 220715B: Swift-XRT refined Analysis
  44. GRB 220715B: Swift detection of a burst
  45. GRB 220715B: Fermi GBM Final Real-time Localization
  46. GRB 220714B: Fermi GBM observation
  47. GRB 220715A: AGILE/MCAL detection
  48. GRB 220714B: Swift-XRT refined Analysis
  49. Fermi GRB 220711B: Global MASTER-Net observations report
  50. GRB 220711B: Swift-XRT refined Analysis
  51. GRB 220711B: NOT optical observations
  52. GRB 220708A: Swift-XRT refined Analysis
  53. GRB 220706A: Swift-BAT refined analysis
  54. GRB 220706A: Swift-XRT refined Analysis
  55. GRB 220706A: Optical observations from NOT
  56. MAXI GRB220706.73: Global MASTER-Net observations report
  57. GRB 220706A: Enhanced Swift-XRT position
  58. GRB 220706A: Prompt enhanced Swift-XRT position
  59. GRB 220706A: Swift detection of a burst
  60. GRB220701A: VIRT Optical Upper Limit
  61. GRB 220701A: MITSuME Akeno optical upper limits
  62. GRB 220701A: Swift-XRT refined Analysis
  63. GRB 220701A: Enhanced Swift-XRT position
  64. GRB 220701A: Swift detection of a burst
  65. GRB 220624A: AGILE/GRID refined analysis
  66. IceCube-220624A: One Candidate Counterpart from Swift/XRT follow up observations
  67. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  68. Fermi trigger No 678058621: Global MASTER-Net observations report
  69. IceCube-Cascade 220625A: Upper limits from a search for additional neutrino events in IceCube
  70. IceCube-220624A: Upper limits from a search for additional neutrino events in IceCube
  71. IceCube-220624A: No significant detection in HAWC
  72. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  73. GRB 220624A: Fermi GBM Detection
  74. Fermi GRB 220624A: Global MASTER-Net observations report
  75. IceCube Alert 220624.68: Global MASTER-Net observations report
  76. IceCube-220624A - IceCube observation of a high-energy neutrino candidate track-like event
  77. GRB 220624A: AGILE detection
  78. GRB 220624B: Fermi GBM Final Real-time Localization
  79. GRB 220624A: Fermi GBM Final Real-time Localization
  80. GRB 220623A: Swift-XRT refined Analysis
  81. Swift Detection of MAXI J0655-013
  82. Integral GRB220619.53: Global MASTER-Net observations report
  83. GRB 220618A: Swift-XRT refined Analysis
  84. GRB 220617A: Swift-XRT observations
  85. Fermi trigger No 676909037: Global MASTER-Net observations report
  86. GRB 220611A: Swift-XRT refined Analysis
  87. Fermi GRB 220610A: Global MASTER-Net observations report
  88. Konus-Wind detection of GRB 220601A
  89. Fermi GRB 220606B: Global MASTER-Net observations report
  90. Fermi trigger No 675992935: Global MASTER-Net observations report
  91. GRB 220527A: MITSuME Akeno continued optical observation
  92. Fermi GRB 220530A: Global MASTER-Net observations report
  93. GRB 220528A: Fermi GBM Final Localization
  94. Fermi trigger No 675411172: Global MASTER-Net observations report
  95. GRB 220527A: MITSuME Akeno optical observation
  96. GRB 220523B: CALET Gamma-Ray Burst Monitor detection
  97. Fermi-LAT Gamma-ray Observations of IceCube-220524A
  98. IceCube-220524A: Upper limits from a search for additional neutrino events in IceCube
  99. GRB 220521A: ATCA detection
  100. IceCube-220524A - IceCube observation of a high-energy neutrino candidate track-like event

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