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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"

28235 results found.

  1. GRB 220412B: TNG optical observations
  2. GRB 220412A: GRANDMA observations
  3. GRB 220412A: Continued RATIR Observations and Steepening of the Light Curve
  4. GRB 220412B: BOOTES-1 optical upper limit
  5. GRB 220412A: Swift-BAT refined analysis
  6. GRB 220412A: RATIR Observations of the Fading Afterglow
  7. GRB 220412B: Swift-XRT observations
  8. IPN triangulation of short/soft GRB 220406A
  9. GRB 220412B: GIT optical upper limit
  10. GRB 220412A: MITSuME Akeno optical upper limits
  11. Correction to GCN 31888: GRB 220412A: Swift-XRT refined Analysis
  12. GRB 220412B: MITSuME Akeno optical upper limits
  13. GRB 220412A: Swift-XRT refined Analysis
  14. GRB 220412A: Enhanced Swift-XRT position
  15. GRB 220412B: Swift detection of a short burst
  16. GRB 220412A: Swift/UVOT Upper Limits
  17. GRB 220408A: GRANDMA observations
  18. GRB 220403B: GRANDMA observations
  19. GRB 220412A: RATIR Afterglow Candidate
  20. GRB 220412A: Swift detection of a burst
  21. GRB 220411A: AstroSat CZTI detection
  22. IPN triangulation of GRB 220403C
  23. GRB 220403B: Swift/UVOT Detection
  24. GRB 220408A: Swift-BAT refined analysis
  25. GRB 220411A: BALROG localization (Fermi Trigger 671354405/ GRB 220411306)
  26. GRB 220408A: RATIR Optical and NIR Observations
  27. GRB 220408A: 1.3m DFOT Optical upper limit
  28. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  29. GRB 220403C: Swift-XRT observations
  30. GRB 220408A: redshift lower limit estimating
  31. GRB 220408A: NOT optical observations and archival detection
  32. GRB 220408B: AstroSat CZTI detection
  33. GRB 220408A: LCO Optical Afterglow Detection
  34. GRB 220408A: Swift-XRT refined Analysis
  35. GRB 220408A: GIT optical upper limit
  36. GRB 220408A: Fermi GBM observation
  37. GRB 220408A: Swift/UVOT Detection
  38. GRB 220408A: Xinglong-2.16m optical upper limit
  39. GRB 220408A: Enhanced Swift-XRT position
  40. GRB 220408A: Swift detection of a burst with an optical counterpart, possibly associated with M51
  41. Fermi-LAT Gamma-ray Observations of IceCube-220405B
  42. GRB 220403B: Mondy optical upper limit
  43. GRB 220404A: Swift-BAT refined analysis
  44. GRB 220403B: Kitab optical observations
  45. Fermi-LAT Gamma-ray Observations of IceCube-220405A
  46. GRB 220403B: Swift-BAT refined analysis
  47. GRB 220403B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  48. GRB 220403B: Fermi GBM detection
  49. GRB 220403B: Swift-XRT refined Analysis
  50. GRB 220403B: LBT observations
  51. GRB 220403C (or A): Swift/BAT-GUANO detection outside the coded FOV
  52. GRB 220403B: Nanshan/NEXT optical afterglow power-law decay
  53. GRB 220403A: Tautenburg observations
  54. GRB 220403B: Swift detection of a burst with an optical counterpart
  55. GRB 220401A: Swift/BAT-GUANO detection outside the coded FOV
  56. GRB 220401A: Fermi GBM observation
  57. Swift Trigger 1100848 is likely not a GRB
  58. GRB 220401B: Fermi GBM Final Real-time Localization
  59. GRB 220401A: Fermi GBM Final Localization
  60. GRB 220325A: GRANDMA observations
  61. GRB 220320A: Detection by VZLUSAT-2
  62. GRB 220325A: Swift/UVOT Upper Limits
  63. GRB 220325A: Swift-BAT refined analysis
  64. GRB 220325A: Tautenburg observations
  65. GRB 220325A: LCO Optical Upper Limits
  66. GRB 220325A: Swift-XRT refined Analysis
  67. Fermi GBM Sub-Threshold Detection of GRB 220325A
  68. GRB 220325A: Enhanced Swift-XRT position
  69. GRB 220324A: AstroSat CZTI detection
  70. GRB 220325A: Swift detection of a burst
  71. GRB 220323A: AstroSat CZTI detection
  72. GRB 220319A: GRANDMA observations
  73. GRB 220319A: Swift-BAT refined analysis
  74. GRB 220316A: AstroSat CZTI detection
  75. GRB 220320A: AstroSat CZTI detection
  76. GRB 220317A: Fermi GBM detection
  77. GRB 220319A: MITSuME Akeno optical upper limits
  78. GRB220319A: Optical observations from NOT
  79. GRB 220319A: LCO Optical Upper Limit
  80. GRB 220319A: Mondy optical uper limit
  81. GRB 220319A: Swift-XRT refined Analysis
  82. GRB 220319A: Enhanced Swift-XRT position
  83. GRB 220319A: Swift detection of a burst
  84. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  85. IceCube-220317A: Upper limits from a search for additional neutrino events in IceCube
  86. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  87. GRB 220310A: MITSuME Akeno optical observation
  88. IceCube-220317A: MASTER Global Robotic Net optical observations
  89. GRB 220311A: Fermi GBM observation
  90. GRB 220306B: Swift/UVOT Upper Limits
  91. GRB 220311A: MITSuME Akeno optical upper limits
  92. GRB 220310C: Fermi GBM observation
  93. GRB 210722A: TAROT Reunion observatory optical light curve
  94. GRB 210222B: TAROT Reunion observatory optical light curve
  95. GRB 201021C: TAROT Reunion observatory optical light curve
  96. GRB 220310A: K-800 of Terskol observatory optical upper limit
  97. GRB 220310C: Swift-XRT observations
  98. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  99. GRB 220311A: A long GRB detected by INTEGRAL
  100. Integral GRB220311.69: Global MASTER-Net OT detection

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