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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"

32706 results found.

  1. IPN triangulation of GRB 220525A
  2. IPN triangulation of GRB 220524B
  3. Fermi-LAT Gamma-ray Observations of IceCube-220524A
  4. IPN triangulation of GRB 220524A
  5. GRB 220521A: ATCA detection
  6. GRB 220521A: ALMA detection
  7. Konus-Wind detection of GRB 220522B
  8. IPN triangulation of GRB 220522B
  9. Konus-Wind detection of GRB 220521B
  10. GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
  11. IPN triangulation of GRB 220521B
  12. GRB 220521A: ISON-Castelgrande observatory optical observations
  13. GRB 220521A: MITSuME Akeno optical upper limits
  14. Fermi GRB 220523B: Global MASTER-Net observations report
  15. GRB 220521A: Gemini Observations
  16. GRB 220521A: MMT Afterglow Imaging
  17. GRB 220521A: REM optical/NIR upper limits
  18. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  19. VLA observations of GW170817 at ~4.8 years after the merger
  20. Fermi GRB 220523A: Global MASTER-Net observations report
  21. GRB 220521A: LCO Optical Detection
  22. GRB 220521A: Swift-BAT refined analysis
  23. GRB 220521A: Fermi GBM detection
  24. GRB 220521A: Sintesz-Newton/CrAO optical upper limit
  25. GRB 220521A: RATIR Optical and NIR Observations
  26. GRB 220521A: Swift-XRT refined Analysis
  27. GRB 220521A: Swift/UVOT Upper Limits
  28. Fermi GRB 220522A: Global MASTER-Net observations report
  29. GRB 220521A: SAO RAS optical observations
  30. GRB 220521A: NOT spectroscopic redshift
  31. GRB 220521A: NOT optical afterglow detection
  32. Konus-Wind detection of GRB 220519A
  33. IPN triangulation of GRB 220519A
  34. GRB 220514A: AstroSat CZTI detection
  35. GRB 220518A: Swift-BAT refined analysis
  36. GRB 220518A: Swift-XRT refined Analysis
  37. Fermi GRB 220518B: Global MASTER-Net observations report
  38. Continued Chandra monitoring of GW170817 at ~4.8 yr post-merger
  39. GRB 220518A: Swift/UVOT Detection
  40. Swift GRB 220518A: Global MASTER-Net observations report
  41. GRB 220514A: MITSuME Akeno optical observation
  42. GRB 220514A: GRANDMA Optical Afterglow Observations
  43. Konus-Wind detection of GRB 220506A
  44. Konus-Wind detection of GRB 220514B
  45. GRB 220514A: Fermi GBM observation
  46. GRB 220514B: Swift-XRT observations
  47. GRB 220511A: Swift-XRT afterglow detection
  48. GRB 220514A: KAIT Optical Afterglow Confirmation
  49. Fermi-LAT Gamma-ray Observations of IceCube-220513A
  50. GRB 220514B: Tiled Swift observations
  51. IceCube-220513A: No significant detection in HAWC
  52. GRB 220514A: MeerLICHT optical afterglow candidate
  53. Fermi GRB 220514A: Global MASTER-Net observations report
  54. GRB 220514A: a long GRB detected by INTEGRAL
  55. IceCube-220513A: No Candidate Counterparts from the Zwicky Transient Facility
  56. Fermi GRB 220513A: Global MASTER-Net observations report
  57. Konus-Wind detection of GRB 220511A
  58. GRB 220427A: MeerLICHT afterglow observations
  59. IceCube-220509A: No significant detection in HAWC
  60. GRB 220511A: Fermi GBM observation
  61. GRB 220511A: Swift-XRT observations
  62. GRB 220511A: AstroSat CZTI detection
  63. Fermi GRB 220512A: Global MASTER-Net observations report
  64. GRB 220511A: Swift ToO observations
  65. GRB 220511A: Swift/BAT-GUANO arcminute localization
  66. Fermi GRB 220511A: Global MASTER-Net observations report
  67. GRB 220511A: AGILE detection
  68. GRB 220507A: AstroSat CZTI detection
  69. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  70. GRB 220506A: MITSuME Akeno optical upper limits
  71. GRB 220506A: GIT optical upper limit.
  72. GRB 220506A: Swift-XRT afterglow detection
  73. GRB 220506A: Tiled Swift observations
  74. IceCube-220405B - ZTF19aavnpjv unrelated
  75. GRB 220430A: Nanshan/NEXT optical upper limit
  76. GRB 220430A: Nanshan/HMT optical upper limit
  77. GRB 220430A: GIT optical upper limits
  78. IPN triangulation of GRB 220423A
  79. GRB 220427A: LCO Optical Observations
  80. GRB 220501A: Swift-BAT refined analysis
  81. Fermi-LAT Gamma-ray Observations of IceCube-220501A
  82. GRB 220427A: GRANDMA Early Optical Afterglow Detection
  83. IceCube-220501A: No Candidate Counterparts from the Zwicky Transient Facility
  84. GRB 220501A: Fermi GBM observation
  85. GRB 220430A: AstroSat CZTI detection
  86. GRB 220501A: GRANDMA/TJML Optical Observations
  87. GRB 220430A: Swift-BAT refined analysis
  88. GRB 220430A: Swift-XRT refined Analysis
  89. Swift GRB 220430A: Global MASTER-Net observations report
  90. GRB 220430A: GRANDMA observations
  91. GRB 220430A: Mondy and AbAO optical upper limits
  92. GRB 220430A: AGILE detection
  93. GRB 220430A: MeerLICHT optical upper limits
  94. GRB 220427A: Swift-BAT refined analysis
  95. GRB 220427A: VLT/X-shooter photometry
  96. GRB 220426A: Swift-XRT and UVOT observations
  97. GRB 220423A: Detection by VZLUSAT-2
  98. Konus-Wind detection of GRB 220427A
  99. GRB 220427A: Swift-XRT refined Analysis
  100. GRB 220426A: Tiled Swift observations

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