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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"

28119 results found.

  1. Konus-Wind detection of GRB 220627A
  2. Trigger 1113743: Swift detection of MAXI J0655-013
  3. IceCube-220627A: Upper limits from a search for additional neutrino events in IceCube
  4. GRB 220627A: VLT MUSE redshift
  5. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  6. GRB 220627A: MeerLICHT candidate optical afterglow
  7. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  8. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  9. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  10. GRB 220627A: Fermi-LAT detection
  11. GRB 220627A: MeerLICHT detection of two afterglow candidates
  12. IceCube-Cascade 220625A: Upper limits from a search for additional neutrino events in IceCube
  13. IceCube-220624A: Upper limits from a search for additional neutrino events in IceCube
  14. IceCube-220624A: No significant detection in HAWC
  15. GRB 220623A: GIT optical upper limits.
  16. GRB 220623A: T193-OHP optical upper limit
  17. GRB 220624A: Fermi GBM Detection
  18. Fermi GRB 220623B: Global MASTER-Net observations report
  19. IPN triangulation of GRB 220624A
  20. GRB 220623A: Swift-BAT refined analysis
  21. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  22. GRB 220624A: AGILE/GRID analysis
  23. GRB 220623A: AbAO optical upper limit
  24. GRB 220623A: Swift-XRT refined Analysis
  25. GRB 220623A: NOT optical observations
  26. GRB 220623A: Swift/UVOT Upper Limits
  27. GRB 220623A: BOOTES-5/JGT optical afterglow detection
  28. GRB 220623A: Enhanced Swift-XRT position
  29. GRB 220623A: AstroSat CZTI detection
  30. GRB 220623A: iTelescope optical upper limit
  31. GRB 220623A: Swift-XRT observations
  32. GRB 220618A: Fermi GBM detection
  33. GRB 220618A: Swift-BAT refined analysis
  34. GRB 220618A: iTelescope T-19 upper limit
  35. GRB 220617A: TNG optical observations
  36. GRB 220617A: Fermi GBM observation
  37. Swift Trigger 1110865 is probably not an astrophysical event
  38. GRB 220618A: Swift-XRT refined Analysis
  39. GRB 220618A: Swift/UVOT Upper Limits
  40. GRB220611A: Gemini Optical Afterglow Confirmation
  41. GRB 220618A: Enhanced Swift-XRT position
  42. GRB 220617A: Swift-XRT observations
  43. GRB 220618A: Swift detection of a burst
  44. GRB 220611A: Swift/UVOT Upper Limits
  45. GRB 220612A: Swift/BAT-GUANO detection
  46. GRB 220608B: Detection by VZLUSAT-2
  47. GRB 220611A: Swift-XRT refined Analysis
  48. GRB 220611A: Enhanced Swift-XRT position
  49. GRB 220611A: Swift detection of a burst
  50. Fermi trigger No 676537486: Global MASTER-Net observations report
  51. GRB 220609B: AstroSat CZTI detection
  52. Fermi trigger No 676366592: Global MASTER-Net observations report
  53. GRB 220608A: AstroSat CZTI detection
  54. GRB 220606A: Fermi GBM observation
  55. Fermi GRB 220608A: Global MASTER-Net observations report
  56. GRB 220606B: Gemini South Optical Observations
  57. MAXI GRB220607.31: Global MASTER-Net observations report
  58. MAXI GRB220607.41: Global MASTER-Net observations report
  59. GRB 220606A: Swift/BAT-GUANO detection
  60. GRB 220527A: A BdHN I with a clear UPE phase
  61. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  62. GRB 220603A: Swift/BAT-GUANO detection outside the coded FOV
  63. GRB 220527A: MITSuME Akeno continued optical observation
  64. GRB 220527A: Lick 3m Optical Observations
  65. IPN triangulation of GRB 220528A (short)
  66. GRB 220528A: Fermi GBM Observation
  67. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  68. GRB 220528A: Fermi GBM Final Localization
  69. GRB 220527A: REM optical/NIR observations
  70. GRB 220527A: MeerLICHT afterglow observations
  71. GRB 220527A: NOT optical photometry and spectroscopic redshift
  72. GRB 220527A: AstroSat CZTI detection
  73. GRB 220527A: MITSuME Akeno optical observation
  74. GRB 220527A: Swift-XRT afterglow detection
  75. Swift trigger 1108208 is not an interesting astrophysical event.
  76. GRB 220527A: Fermi GBM Observation
  77. GRB 220527A: Fermi GBM Final Localization
  78. GRB 220525A: Fermi GBM Detection
  79. Fermi GRB 220525A: Global MASTER-Net observations report
  80. Fermi-LAT Gamma-ray Observations of IceCube-220524A
  81. IPN triangulation of GRB 220524A
  82. IceCube-220524A: Upper limits from a search for additional neutrino events in IceCube
  83. GRB 220525A: BALROG localization (Fermi Trigger 675130259 / GRB 220525008)
  84. GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
  85. GRB 220521A: MITSuME Akeno optical upper limits
  86. GRB 220521A: REM optical/NIR upper limits
  87. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  88. GRB 220521A: LCO Optical Detection
  89. GRB 220521A: Swift-BAT refined analysis
  90. GRB 220521A: Fermi GBM detection
  91. GRB 220521A: RATIR Optical and NIR Observations
  92. GRB 220521A: Swift-XRT refined Analysis
  93. GRB 220521A: Swift/UVOT Upper Limits
  94. GRB 220521A: SAO RAS optical observations
  95. GRB 220521A: Enhanced Swift-XRT position
  96. GRB 220521A: NOT optical afterglow detection
  97. GRB 220521A: Swift detection of a burst
  98. Swift BAT Trigger 1107209 is not an astrophysical event
  99. GRB 220518A: Swift-BAT refined analysis
  100. GRB 220518A: Swift-XRT refined Analysis

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