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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"

5557 results found.

  1. Fermi trigger No 685748699: Global MASTER-Net observations report
  2. Fermi trigger No 684894705: Global MASTER-Net observations report
  3. IceCube-220907A: No significant detection in HAWC
  4. Fermi GRB 220912A: Global MASTER-Net observations report
  5. GRB 220831A: Gemini-South Infrared Observations
  6. IceCube-220907A: One Candidate Counterpart from the Zwicky Transient Facility
  7. IceCube Alert 220907.28: Global MASTER-Net observations report
  8. Fermi GRB 220902A: Global MASTER-Net observations report
  9. Fermi trigger No 683654200: Global MASTER-Net observations report
  10. GRB 220827A: Fermi GBM Final Real-time Localization
  11. Fermi trigger No 683202084: Global MASTER-Net observations report
  12. Fermi trigger No 683183601: Global MASTER-Net observations report
  13. IceCube-220822A: One Candidate Counterpart from the Zwicky Transient Facility
  14. GRB 220823A: Fermi GBM detection
  15. Fermi trigger No 682918137: Global MASTER-Net observations report
  16. GRB 220813A: Swift detection of a burst with an optical counterpart
  17. Fermi trigger No 681890304: Global MASTER-Net observations report
  18. Fermi trigger No 681719116: Global MASTER-Net observations report
  19. Fermi trigger No 681633544: Global MASTER-Net observations report
  20. Fermi trigger No 681271717: Global MASTER-Net observations report
  21. GRB 220803A: AstroSat CZTI detection
  22. Fermi trigger No 681212354: Global MASTER-Net observations report
  23. Fermi trigger No 680782656: Global MASTER-Net observations report
  24. Fermi GRB 220728A: Global MASTER-Net observations report
  25. Fermi trigger No 680421061: Global MASTER-Net observations report
  26. GRB 220724A: Fermi GBM Final Real-time Localization
  27. GRB 220714B: UVOT afterglow discovery
  28. Fermi GRB 220711B: Global MASTER-Net observations report
  29. GRB 220706A : NICER detection of re-brightening 1 day after the Swift trigger
  30. GRB 220701A: COATLI Optical Upper Limit
  31. IceCube-220629A: No significant detection in HAWC
  32. IceCube-220627A: No significant detection in HAWC
  33. IceCube Alert 220627.74: Global MASTER-Net observations report
  34. GRB 220623A: BOOTES-5/JGT optical afterglow detection
  35. Swift GRB220620.02: Global MASTER-Net observations report
  36. Fermi trigger No 677307509: Global MASTER-Net observations report
  37. IPN triangulation of GRB 220606C
  38. Fermi trigger No 676909037: Global MASTER-Net observations report
  39. GRB 220608A: AstroSat CZTI detection
  40. Fermi GRB 220608A: Global MASTER-Net observations report
  41. GRB 220608A: Fermi GBM Final Real-time Localization
  42. GRB 220606B: Fermi GBM Observation
  43. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  44. Fermi GRB 220606B: Global MASTER-Net observations report
  45. GRB 220606B: Fermi GBM Final Real-time Localization
  46. Fermi trigger No 675992935: Global MASTER-Net observations report
  47. Fermi trigger No 675411172: Global MASTER-Net observations report
  48. GRB 220527A: NOT optical photometry and spectroscopic redshift
  49. GRB 220521B: CALET Gamma-Ray Burst Monitor detection
  50. IPN triangulation of GRB 220524A
  51. IPN triangulation of GRB 220522B
  52. Konus-Wind detection of GRB 220521B
  53. IPN triangulation of GRB 220521B
  54. Fermi GRB 220523B: Global MASTER-Net observations report
  55. GRB 220521A: Swift detection of a burst
  56. GRB 220518A: Swift/UVOT Detection
  57. GRB 220514A: KAIT Optical Afterglow Confirmation
  58. GRB 220514B: MAXI/GSC detection
  59. MAXI GRB220514.98: Global MASTER-Net observations report
  60. Fermi GRB 220513A: Global MASTER-Net observations report
  61. GRB 220512A: Fermi GBM Final Real-time Localization
  62. GRB 220427A: Swift detection of a burst with an optical counterpart
  63. Fermi trigger No 672492774: Global MASTER-Net observations report
  64. GRB 220421B: Detection by VZLUSAT-2
  65. IPN triangulation of GRB 220411A
  66. Fermi GRB 220417A: Global MASTER-Net observations report
  67. Fermi trigger No 671729344: Global MASTER-Net observations report
  68. GRB 220412A: Continued RATIR Observations and Steepening of the Light Curve
  69. GRB 220412A: BOOTES-network optical upper limits
  70. GRB 220412B: BOOTES-1 optical upper limit
  71. GRB 220412A: RATIR Observations of the Fading Afterglow
  72. Correction to GCN 31888: GRB 220412A: Swift-XRT refined Analysis
  73. GRB 220408A: Swift-BAT refined analysis
  74. Fermi GRB 220411A: Global MASTER-Net observations report
  75. GRB 220408A: NOT optical observations and archival detection
  76. Fermi GRB 220408B: Global MASTER-Net observations report
  77. GRB 220408A: Swift detection of a burst with an optical counterpart, possibly associated with M51
  78. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, SAO RAS, CrAO)
  79. GRB 220403B: 1.5m OSN optical observation
  80. GRB 220403B: Kitab optical observations
  81. GRB 220403B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  82. GRB 220403B: Fermi GBM detection
  83. GRB 220403B: Nanshan/NEXT optical afterglow power-law decay
  84. GRB 220403A: Tautenburg observations
  85. Fermi GRB 220403A: Global MASTER-Net observations report
  86. Swift Trigger 1100848 is likely not a GRB
  87. Swift GRB220402.16: Global MASTER-Net observations report
  88. Fermi GRB 220401B: Global MASTER-Net observations report
  89. Fermi GRB 220330A: Global MASTER-Net observations report
  90. ZTF22aaajecp/AT2022cmc: 1.3m DFOT Optical observations
  91. GRB 220325A: Swift-BAT refined analysis
  92. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, TSHAO, AbAO)
  93. GRB 220325A: Tautenburg observations
  94. GRB 220325A: 1.3m DFOT Optical upper limit
  95. GRB 220325A: MASTER Global Robotic Net optical observations
  96. GRB 220324A: AstroSat CZTI detection
  97. GRB 220323A: AstroSat CZTI detection
  98. GRB 220323A: AGILE/MCAL detection
  99. GRB 220316A: AstroSat CZTI detection
  100. GRB 220320A: AstroSat CZTI detection

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