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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"

28231 results found.

  1. GRB 220701A: Swift/UVOT Upper Limits
  2. GRB 220701A: Lowell Discovery Telescope Optical Observations
  3. GRB 220701A: Enhanced Swift-XRT position
  4. GRB 220701A: Swift detection of a burst
  5. Fermi-LAT Gamma-ray Observations of IceCube-220629A
  6. GRB 220627A, GROND observations
  7. GRB 220624A: AGILE/GRID refined analysis
  8. GRB 220627A: Swift/UVOT Upper Limits
  9. Fermi-LAT Gamma-ray Observations of IceCube-220627A
  10. IceCube-220629A: No significant detection in HAWC
  11. IceCube-220627A: No significant detection in HAWC
  12. GRB 220627A: Swift-XRT afterglow detection
  13. Konus-Wind detection of GRB 220627A
  14. Trigger 1113743: Swift detection of MAXI J0655-013
  15. IceCube-220627A: Upper limits from a search for additional neutrino events in IceCube
  16. GRB 220627A: VLT MUSE redshift
  17. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  18. GRB 220627A: MeerLICHT candidate optical afterglow
  19. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  20. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  21. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  22. GRB 220627A: Fermi-LAT detection
  23. GRB 220627A: MeerLICHT detection of two afterglow candidates
  24. IceCube-Cascade 220625A: Upper limits from a search for additional neutrino events in IceCube
  25. IceCube-220624A: Upper limits from a search for additional neutrino events in IceCube
  26. IceCube-220624A: No significant detection in HAWC
  27. GRB 220623A: GIT optical upper limits.
  28. GRB 220623A: T193-OHP optical upper limit
  29. GRB 220624A: Fermi GBM Detection
  30. Fermi GRB 220623B: Global MASTER-Net observations report
  31. IPN triangulation of GRB 220624A
  32. GRB 220623A: Swift-BAT refined analysis
  33. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  34. GRB 220624A: AGILE/GRID analysis
  35. GRB 220623A: AbAO optical upper limit
  36. GRB 220623A: Swift-XRT refined Analysis
  37. GRB 220623A: NOT optical observations
  38. GRB 220623A: Swift/UVOT Upper Limits
  39. GRB 220623A: BOOTES-5/JGT optical afterglow detection
  40. GRB 220623A: Enhanced Swift-XRT position
  41. GRB 220623A: AstroSat CZTI detection
  42. GRB 220623A: iTelescope optical upper limit
  43. GRB 220623A: Swift-XRT observations
  44. GRB 220618A: Fermi GBM detection
  45. GRB 220618A: Swift-BAT refined analysis
  46. GRB 220618A: iTelescope T-19 upper limit
  47. GRB 220617A: TNG optical observations
  48. GRB 220617A: Fermi GBM observation
  49. Swift Trigger 1110865 is probably not an astrophysical event
  50. GRB 220618A: Swift-XRT refined Analysis
  51. GRB 220618A: Swift/UVOT Upper Limits
  52. GRB220611A: Gemini Optical Afterglow Confirmation
  53. GRB 220618A: Enhanced Swift-XRT position
  54. GRB 220617A: Swift-XRT observations
  55. GRB 220618A: Swift detection of a burst
  56. GRB 220611A: Swift/UVOT Upper Limits
  57. GRB 220612A: Swift/BAT-GUANO detection
  58. GRB 220608B: Detection by VZLUSAT-2
  59. GRB 220611A: Swift-XRT refined Analysis
  60. GRB 220611A: Enhanced Swift-XRT position
  61. GRB 220611A: Swift detection of a burst
  62. Fermi trigger No 676537486: Global MASTER-Net observations report
  63. GRB 220609B: AstroSat CZTI detection
  64. Fermi trigger No 676366592: Global MASTER-Net observations report
  65. GRB 220608A: AstroSat CZTI detection
  66. GRB 220606A: Fermi GBM observation
  67. Fermi GRB 220608A: Global MASTER-Net observations report
  68. GRB 220606B: Gemini South Optical Observations
  69. MAXI GRB220607.31: Global MASTER-Net observations report
  70. MAXI GRB220607.41: Global MASTER-Net observations report
  71. GRB 220606A: Swift/BAT-GUANO detection
  72. GRB 220527A: A BdHN I with a clear UPE phase
  73. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  74. GRB 220603A: Swift/BAT-GUANO detection outside the coded FOV
  75. GRB 220527A: MITSuME Akeno continued optical observation
  76. GRB 220527A: Lick 3m Optical Observations
  77. IPN triangulation of GRB 220528A (short)
  78. GRB 220528A: Fermi GBM Observation
  79. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  80. GRB 220528A: Fermi GBM Final Localization
  81. GRB 220527A: REM optical/NIR observations
  82. GRB 220527A: MeerLICHT afterglow observations
  83. GRB 220527A: NOT optical photometry and spectroscopic redshift
  84. GRB 220527A: AstroSat CZTI detection
  85. GRB 220527A: MITSuME Akeno optical observation
  86. GRB 220527A: Swift-XRT afterglow detection
  87. Swift trigger 1108208 is not an interesting astrophysical event.
  88. GRB 220527A: Fermi GBM Observation
  89. GRB 220527A: Fermi GBM Final Localization
  90. GRB 220525A: Fermi GBM Detection
  91. Fermi GRB 220525A: Global MASTER-Net observations report
  92. Fermi-LAT Gamma-ray Observations of IceCube-220524A
  93. IPN triangulation of GRB 220524A
  94. IceCube-220524A: Upper limits from a search for additional neutrino events in IceCube
  95. GRB 220525A: BALROG localization (Fermi Trigger 675130259 / GRB 220525008)
  96. GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
  97. GRB 220521A: MITSuME Akeno optical upper limits
  98. GRB 220521A: REM optical/NIR upper limits
  99. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  100. GRB 220521A: LCO Optical Detection

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