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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"

32714 results found.

  1. GRB 220521B: CALET Gamma-Ray Burst Monitor detection
  2. GRB 220525A: Fermi GBM Detection
  3. GRB 220525A: CALET Gamma-Ray Burst Monitor detection
  4. GRB 220523B: CALET Gamma-Ray Burst Monitor detection
  5. Konus-Wind detection of GRB 220524B
  6. Konus-Wind detection of GRB 220525A
  7. Konus-Wind detection of GRB 220524A
  8. Fermi GRB 220525A: Global MASTER-Net observations report
  9. IPN triangulation of GRB 220525A
  10. IPN triangulation of GRB 220524B
  11. Fermi-LAT Gamma-ray Observations of IceCube-220524A
  12. IPN triangulation of GRB 220524A
  13. GRB 220521A: ATCA detection
  14. GRB 220521A: ALMA detection
  15. Konus-Wind detection of GRB 220522B
  16. IPN triangulation of GRB 220522B
  17. Konus-Wind detection of GRB 220521B
  18. GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
  19. IPN triangulation of GRB 220521B
  20. GRB 220521A: ISON-Castelgrande observatory optical observations
  21. GRB 220521A: MITSuME Akeno optical upper limits
  22. Fermi GRB 220523B: Global MASTER-Net observations report
  23. GRB 220521A: Gemini Observations
  24. GRB 220521A: MMT Afterglow Imaging
  25. GRB 220521A: REM optical/NIR upper limits
  26. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  27. VLA observations of GW170817 at ~4.8 years after the merger
  28. Fermi GRB 220523A: Global MASTER-Net observations report
  29. GRB 220521A: LCO Optical Detection
  30. GRB 220521A: Swift-BAT refined analysis
  31. GRB 220521A: Fermi GBM detection
  32. GRB 220521A: Sintesz-Newton/CrAO optical upper limit
  33. GRB 220521A: RATIR Optical and NIR Observations
  34. GRB 220521A: Swift-XRT refined Analysis
  35. GRB 220521A: Swift/UVOT Upper Limits
  36. Fermi GRB 220522A: Global MASTER-Net observations report
  37. GRB 220521A: SAO RAS optical observations
  38. GRB 220521A: NOT spectroscopic redshift
  39. GRB 220521A: NOT optical afterglow detection
  40. Konus-Wind detection of GRB 220519A
  41. IPN triangulation of GRB 220519A
  42. GRB 220514A: AstroSat CZTI detection
  43. GRB 220518A: Swift-BAT refined analysis
  44. GRB 220518A: Swift-XRT refined Analysis
  45. Fermi GRB 220518B: Global MASTER-Net observations report
  46. Continued Chandra monitoring of GW170817 at ~4.8 yr post-merger
  47. GRB 220518A: Swift/UVOT Detection
  48. Swift GRB 220518A: Global MASTER-Net observations report
  49. GRB 220514A: MITSuME Akeno optical observation
  50. GRB 220514A: GRANDMA Optical Afterglow Observations
  51. Konus-Wind detection of GRB 220506A
  52. Konus-Wind detection of GRB 220514B
  53. GRB 220514A: Fermi GBM observation
  54. GRB 220514B: Swift-XRT observations
  55. GRB 220511A: Swift-XRT afterglow detection
  56. GRB 220514A: KAIT Optical Afterglow Confirmation
  57. Fermi-LAT Gamma-ray Observations of IceCube-220513A
  58. GRB 220514B: Tiled Swift observations
  59. IceCube-220513A: No significant detection in HAWC
  60. GRB 220514A: MeerLICHT optical afterglow candidate
  61. Fermi GRB 220514A: Global MASTER-Net observations report
  62. GRB 220514A: a long GRB detected by INTEGRAL
  63. IceCube-220513A: No Candidate Counterparts from the Zwicky Transient Facility
  64. Fermi GRB 220513A: Global MASTER-Net observations report
  65. Konus-Wind detection of GRB 220511A
  66. GRB 220427A: MeerLICHT afterglow observations
  67. IceCube-220509A: No significant detection in HAWC
  68. GRB 220511A: Fermi GBM observation
  69. GRB 220511A: Swift-XRT observations
  70. GRB 220511A: AstroSat CZTI detection
  71. Fermi GRB 220512A: Global MASTER-Net observations report
  72. GRB 220511A: Swift ToO observations
  73. GRB 220511A: Swift/BAT-GUANO arcminute localization
  74. Fermi GRB 220511A: Global MASTER-Net observations report
  75. GRB 220511A: AGILE detection
  76. GRB 220507A: AstroSat CZTI detection
  77. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  78. GRB 220506A: MITSuME Akeno optical upper limits
  79. GRB 220506A: GIT optical upper limit.
  80. GRB 220506A: Swift-XRT afterglow detection
  81. GRB 220506A: Tiled Swift observations
  82. IceCube-220405B - ZTF19aavnpjv unrelated
  83. GRB 220430A: Nanshan/NEXT optical upper limit
  84. GRB 220430A: Nanshan/HMT optical upper limit
  85. GRB 220430A: GIT optical upper limits
  86. IPN triangulation of GRB 220423A
  87. GRB 220427A: LCO Optical Observations
  88. GRB 220501A: Swift-BAT refined analysis
  89. Fermi-LAT Gamma-ray Observations of IceCube-220501A
  90. GRB 220427A: GRANDMA Early Optical Afterglow Detection
  91. IceCube-220501A: No Candidate Counterparts from the Zwicky Transient Facility
  92. GRB 220501A: Fermi GBM observation
  93. GRB 220430A: AstroSat CZTI detection
  94. GRB 220501A: GRANDMA/TJML Optical Observations
  95. GRB 220430A: Swift-BAT refined analysis
  96. GRB 220430A: Swift-XRT refined Analysis
  97. Swift GRB 220430A: Global MASTER-Net observations report
  98. GRB 220430A: GRANDMA observations
  99. GRB 220430A: Mondy and AbAO optical upper limits
  100. GRB 220430A: AGILE detection

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