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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"

5184 results found.

  1. Fermi trigger No 687340841: Global MASTER-Net observations report
  2. Fermi trigger No 687337536: Global MASTER-Net observations report
  3. GRB 221009A: MITSuME Okayama optical observation
  4. Fermi trigger No 687281393: Global MASTER-Net observations report
  5. GRB221009A: optical afterglow measurements from Konkoly Observatory
  6. Fermi trigger No 687205006: Global MASTER-Net observations report
  7. GRB 221009A: Sintez-Newton/CrAO optical observations
  8. Swift/XRT discovery of multiple dust-scattering X-ray rings around GRB 221009A
  9. GRB 221009A/Swift J1913.1+1946: Assy optical afterglow observation
  10. ​GRB 221009A: Multi-color detection of the optical
  11. GRB 221006A: MAXI/GSC detection
  12. GRB 220930A: MITSuME Akeno optical upper limits
  13. GRB 220921A: ATCA detection of radio counterpart
  14. Fermi trigger No 686403226: Global MASTER-Net observations report
  15. Fermi trigger No 686350260: Global MASTER-Net observations report
  16. GRB 220930A: Swift-XRT refined Analysis
  17. GRB 220930A: LCOGT Optical Upper Limits
  18. Swift GRB 220930A: Global MASTER-Net observations report
  19. IceCube-220928A: Upper limits from a search for additional neutrino events in IceCube
  20. GRB 220611A: Host galaxy redshift from VLT/X-shooter
  21. GRB 220924A: Fermi GBM detection
  22. Fermi GRB 220925A: Global MASTER-Net observations report
  23. GRB 220921A: further MeerLICHT observations
  24. Fermi trigger No 685748699: Global MASTER-Net observations report
  25. GRB 220924A: Fermi GBM Final Real-time Localization
  26. Swift GRB220923.47: Global MASTER-Net observations report
  27. GRB 220921A: ALMA detection
  28. GRB 220921A: DDOTI Detection of the Afterglow
  29. GRB 220921A: Swift-XRT Observations
  30. GRB 220921A: MASTER OT inside Fermi-LAT error-box
  31. Fermi trigger No 685452089: Global MASTER-Net observations report
  32. Fermi trigger No 684716840: Global MASTER-Net observations report
  33. Fermi GRB 220912A: Global MASTER-Net observations report
  34. GRB 220912A: AstroSat CZTI detection
  35. GRB 220909A: Swift-XRT observations
  36. Fermi GRB 220902A: Global MASTER-Net observations report
  37. GRB 220831A, VLT/HAWK-I near-infrared observations
  38. Fermi trigger No 683202084: Global MASTER-Net observations report
  39. Fermi trigger No 683183601: Global MASTER-Net observations report
  40. Fermi trigger No 683152759: Global MASTER-Net observations report
  41. GRB 220826A: Swift-XRT refined Analysis
  42. Fermi trigger No 682918137: Global MASTER-Net observations report
  43. GRB 220813A: Swift-XRT refined Analysis
  44. GRB 220813A: Swift detection of a burst with an optical counterpart
  45. Fermi trigger No 681998863: Global MASTER-Net observations report
  46. GRB 220806A: Swift detection of a burst
  47. GRB 220804A: Fermi GBM Final Localization
  48. Fermi trigger No 681212354: Global MASTER-Net observations report
  49. Fermi trigger No 680782656: Global MASTER-Net observations report
  50. Fermi GRB 220728A: Global MASTER-Net observations report
  51. GRB 220724A: Fermi GBM Final Real-time Localization
  52. Fermi GRB 220721A: Global MASTER-Net observations report
  53. GRB 220715B: Fermi GBM detection
  54. GRB 220715B: Swift-XRT refined Analysis
  55. GRB 220715B: Swift detection of a burst
  56. GRB 220715B: Fermi GBM Final Real-time Localization
  57. GRB 220714B: Fermi GBM observation
  58. GRB 220715A: AGILE/MCAL detection
  59. GRB 220714B: Swift-XRT refined Analysis
  60. Fermi GRB 220711B: Global MASTER-Net observations report
  61. GRB 220711B: Swift-XRT refined Analysis
  62. GRB 220711B: NOT optical observations
  63. GRB 220708A: Swift-XRT refined Analysis
  64. GRB 220706A: Swift-BAT refined analysis
  65. GRB 220706A: Swift-XRT refined Analysis
  66. GRB 220706A: Optical observations from NOT
  67. MAXI GRB220706.73: Global MASTER-Net observations report
  68. GRB 220706A: Enhanced Swift-XRT position
  69. GRB 220706A: Prompt enhanced Swift-XRT position
  70. GRB 220706A: Swift detection of a burst
  71. GRB220701A: VIRT Optical Upper Limit
  72. GRB 220701A: MITSuME Akeno optical upper limits
  73. GRB 220701A: Swift-XRT refined Analysis
  74. GRB 220701A: Enhanced Swift-XRT position
  75. GRB 220701A: Swift detection of a burst
  76. GRB 220624A: AGILE/GRID refined analysis
  77. IceCube-220624A: One Candidate Counterpart from Swift/XRT follow up observations
  78. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  79. Fermi trigger No 678058621: Global MASTER-Net observations report
  80. IceCube-Cascade 220625A: Upper limits from a search for additional neutrino events in IceCube
  81. IceCube-220624A: Upper limits from a search for additional neutrino events in IceCube
  82. IceCube-220624A: No significant detection in HAWC
  83. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  84. GRB 220624A: Fermi GBM Detection
  85. Fermi GRB 220624A: Global MASTER-Net observations report
  86. IceCube Alert 220624.68: Global MASTER-Net observations report
  87. IceCube-220624A - IceCube observation of a high-energy neutrino candidate track-like event
  88. GRB 220624A: AGILE detection
  89. GRB 220624B: Fermi GBM Final Real-time Localization
  90. GRB 220624A: Fermi GBM Final Real-time Localization
  91. GRB 220623A: Swift-XRT refined Analysis
  92. Swift Detection of MAXI J0655-013
  93. Integral GRB220619.53: Global MASTER-Net observations report
  94. GRB 220618A: Swift-XRT refined Analysis
  95. GRB 220617A: Swift-XRT observations
  96. Fermi trigger No 676909037: Global MASTER-Net observations report
  97. GRB 220611A: Swift-XRT refined Analysis
  98. Fermi GRB 220610A: Global MASTER-Net observations report
  99. Konus-Wind detection of GRB 220601A
  100. Fermi GRB 220606B: Global MASTER-Net observations report

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