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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"

28240 results found.

  1. GRB 220417A: Swift/BAT-GUANO detection outside the coded FOV
  2. GRB 220412B: Swift/UVOT Upper Limits
  3. Fermi trigger No 671729344: Global MASTER-Net observations report
  4. GRB 220412B: Swift-BAT refined analysis
  5. GRB 220408B: Fermi GBM observation
  6. GRB 220412B: TNG optical observations
  7. GRB 220412A: GRANDMA observations
  8. GRB 220412A: Continued RATIR Observations and Steepening of the Light Curve
  9. GRB 220412B: BOOTES-1 optical upper limit
  10. GRB 220412A: Swift-BAT refined analysis
  11. GRB 220412A: RATIR Observations of the Fading Afterglow
  12. GRB 220412B: Swift-XRT observations
  13. IPN triangulation of short/soft GRB 220406A
  14. GRB 220412B: GIT optical upper limit
  15. GRB 220412A: MITSuME Akeno optical upper limits
  16. Correction to GCN 31888: GRB 220412A: Swift-XRT refined Analysis
  17. GRB 220412B: MITSuME Akeno optical upper limits
  18. GRB 220412A: Swift-XRT refined Analysis
  19. GRB 220412A: Enhanced Swift-XRT position
  20. GRB 220412B: Swift detection of a short burst
  21. GRB 220412A: Swift/UVOT Upper Limits
  22. GRB 220408A: GRANDMA observations
  23. GRB 220403B: GRANDMA observations
  24. GRB 220412A: RATIR Afterglow Candidate
  25. GRB 220412A: Swift detection of a burst
  26. GRB 220411A: AstroSat CZTI detection
  27. IPN triangulation of GRB 220403C
  28. GRB 220403B: Swift/UVOT Detection
  29. GRB 220408A: Swift-BAT refined analysis
  30. GRB 220411A: BALROG localization (Fermi Trigger 671354405/ GRB 220411306)
  31. GRB 220408A: RATIR Optical and NIR Observations
  32. GRB 220408A: 1.3m DFOT Optical upper limit
  33. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  34. GRB 220403C: Swift-XRT observations
  35. GRB 220408A: redshift lower limit estimating
  36. GRB 220408A: NOT optical observations and archival detection
  37. GRB 220408B: AstroSat CZTI detection
  38. GRB 220408A: LCO Optical Afterglow Detection
  39. GRB 220408A: Swift-XRT refined Analysis
  40. GRB 220408A: GIT optical upper limit
  41. GRB 220408A: Fermi GBM observation
  42. GRB 220408A: Swift/UVOT Detection
  43. GRB 220408A: Xinglong-2.16m optical upper limit
  44. GRB 220408A: Enhanced Swift-XRT position
  45. GRB 220408A: Swift detection of a burst with an optical counterpart, possibly associated with M51
  46. Fermi-LAT Gamma-ray Observations of IceCube-220405B
  47. GRB 220403B: Mondy optical upper limit
  48. GRB 220404A: Swift-BAT refined analysis
  49. GRB 220403B: Kitab optical observations
  50. Fermi-LAT Gamma-ray Observations of IceCube-220405A
  51. GRB 220403B: Swift-BAT refined analysis
  52. GRB 220403B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  53. GRB 220403B: Fermi GBM detection
  54. GRB 220403B: Swift-XRT refined Analysis
  55. GRB 220403B: LBT observations
  56. GRB 220403C (or A): Swift/BAT-GUANO detection outside the coded FOV
  57. GRB 220403B: Nanshan/NEXT optical afterglow power-law decay
  58. GRB 220403A: Tautenburg observations
  59. GRB 220403B: Swift detection of a burst with an optical counterpart
  60. GRB 220401A: Swift/BAT-GUANO detection outside the coded FOV
  61. GRB 220401A: Fermi GBM observation
  62. Swift Trigger 1100848 is likely not a GRB
  63. GRB 220401B: Fermi GBM Final Real-time Localization
  64. GRB 220401A: Fermi GBM Final Localization
  65. GRB 220325A: GRANDMA observations
  66. GRB 220320A: Detection by VZLUSAT-2
  67. GRB 220325A: Swift/UVOT Upper Limits
  68. GRB 220325A: Swift-BAT refined analysis
  69. GRB 220325A: Tautenburg observations
  70. GRB 220325A: LCO Optical Upper Limits
  71. GRB 220325A: Swift-XRT refined Analysis
  72. Fermi GBM Sub-Threshold Detection of GRB 220325A
  73. GRB 220325A: Enhanced Swift-XRT position
  74. GRB 220324A: AstroSat CZTI detection
  75. GRB 220325A: Swift detection of a burst
  76. GRB 220323A: AstroSat CZTI detection
  77. GRB 220319A: GRANDMA observations
  78. GRB 220319A: Swift-BAT refined analysis
  79. GRB 220316A: AstroSat CZTI detection
  80. GRB 220320A: AstroSat CZTI detection
  81. GRB 220317A: Fermi GBM detection
  82. GRB 220319A: MITSuME Akeno optical upper limits
  83. GRB220319A: Optical observations from NOT
  84. GRB 220319A: LCO Optical Upper Limit
  85. GRB 220319A: Mondy optical uper limit
  86. GRB 220319A: Swift-XRT refined Analysis
  87. GRB 220319A: Enhanced Swift-XRT position
  88. GRB 220319A: Swift detection of a burst
  89. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  90. IceCube-220317A: Upper limits from a search for additional neutrino events in IceCube
  91. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  92. GRB 220310A: MITSuME Akeno optical observation
  93. IceCube-220317A: MASTER Global Robotic Net optical observations
  94. GRB 220311A: Fermi GBM observation
  95. GRB 220306B: Swift/UVOT Upper Limits
  96. GRB 220311A: MITSuME Akeno optical upper limits
  97. GRB 220310C: Fermi GBM observation
  98. GRB 210722A: TAROT Reunion observatory optical light curve
  99. GRB 210222B: TAROT Reunion observatory optical light curve
  100. GRB 201021C: TAROT Reunion observatory optical light curve

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