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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"

19645 results found.

  1. GRB 261010A: LBT tentative near-infrared detection
  2. GRB 261010A: Glowbug gamma-ray detection
  3. GRB 261011A: Later-epoch J-band upper limit from the SYSU 80 cm infrared telescope
  4. GRID detection of GRB 261010A
  5. GRB 261011A: GECAM-B observation
  6. GRB 261010A: J-band upper limit by the SYSU 80cm infrared telescope
  7. GRB 261010A: Swift-XRT refined Analysis
  8. GRB 261011A: Swift-XRT refined Analysis
  9. GRB 261011A: Enhanced Swift-XRT position
  10. GRB 261011A: 10.4m GTC spectroscopic redshift (z = 2.407)
  11. GRB 261011A: Swift-BAT refined analysis
  12. GRB 261010A: 10.4m GTC spectroscopy of the galaxy 2" from the afterglow
  13. GRB 261011A: REM optical/NIR observations
  14. Konus-Wind detection of GRB 261010A
  15. Konus-Wind detection of GRB 261011A
  16. GRB 261011A: SOAR optical afterglow observations at ~17 hours
  17. GRB 261010A: Swift-BAT refined analysis
  18. GRB 261011A : MITSuME Akeno optical afterglow candidate detection
  19. GRB 261011A: Optical followup from Sichuan South Observatory
  20. GRB 261011A: GMG Optical Observation
  21. GRB 261011A: Liverpool Telescope optical observations
  22. GRB 261011A: J-band observations by the SYSU 80cm infrared telescope
  23. GRB 261010A: NOT confirmation of the optical afterglow
  24. GRB 261010A: Fermi GBM Observation
  25. GRB 261011A: continued LCO optical observations
  26. GRB 261011A: GROWTH-India Telescope optical observations
  27. GRB 261011A: Luminance-band upper limit from a 28cm telescope in Chengde
  28. Swift GRB 261011A: Global MASTER-Net observations report
  29. GRB 261011A: Optical follow-up observations with Kinder
  30. GRB 261011A: SVOM/VT optical observation from VHF data
  31. GRB 261011A: LCO optical observations
  32. GRB 261011A: TRT optical afterglow detection
  33. GRB 261011A: GOTO optical counterpart detection
  34. GRB 261011A: Swift detection of an unusual burst
  35. GRB 261010A: Enhanced Swift-XRT position
  36. GRB 261010A: possible optical afterglow detected with the 1.5m OSN
  37. GRB 261010A: NOT possible optical counterpart
  38. GRB 261010A: Swift detection of a burst
  39. EP261006a: Swift/XRT detection of the fading X-ray counterpart
  40. GRB 261007A: Swift-XRT afterglow detection
  41. GRB 261007A: Swift ToO observations
  42. GRB 261005B: Swift-BAT refined analysis
  43. GRB 261005B: Swift-XRT refined Analysis
  44. GRB 261005B: Swift/UVOT Upper Limits
  45. GRB 261005B: J-band upper limit with WINTER
  46. GRB 261005B: Fermi GBM Observation
  47. GRB 261005B: Enhanced Swift-XRT position
  48. GRB 261005B: Swift detection of a burst
  49. EP#01709320865: Swift-XRT observations
  50. Trigger_21915: Swift ToO observations (retracted)
  51. GRB 260924A: Swift/UVOT UV grism spectrum results
  52. GRB 260925A: Swift-BAT refined analysis
  53. Swift Trigger 1513439: consistent with noise and not astrophysical
  54. GRB 260924A: COLIBRÍ optical observations
  55. GRB 260924A: Second-epoch J-band upper limit from the SYSU 80 cm infrared telescope
  56. GRB 260925A: Swift-XRT refined Analysis
  57. Swift Trigger 1513439 is probably not a GRB
  58. GRB 260925A: Swift/UVOT Upper Limits
  59. Konus-Wind detection of GRB 260924A
  60. GRB 260922A: Glowbug gamma-ray detection
  61. GRB 260925A: Enhanced Swift-XRT position
  62. GRB 260925A: COLIBRÍ optical upper limits
  63. GRB 260925A: FRAM-Auger optical limit
  64. GRB 260924A: Ondrejov D50 optical afterglow detection
  65. GRB 260924A: SVOM/GRM observation
  66. GRB 260924A: 2.2m CAHA spectroscopic redshift z = 3.51
  67. GRB 260925A: Swift detection of a burst
  68. GRB 260924A: J-band observations by the SYSU 80 cm infrared telescope
  69. GRB 260924A: Swift/UVOT Detection
  70. GRB 260924A: Swift-BAT refined analysis
  71. GRB 260924A: NuSTAR detection of prompt emission
  72. GRB 260924A: Swift/UVOT Upper Limits
  73. GRB 260924A: Swift-XRT refined Analysis
  74. Konus-Wind detection of GRB 260922A
  75. GRB 260922A: NuSTAR detection of prompt emission
  76. GRB 260921A: NuSTAR detection of prompt emission
  77. GRB 260921A: SVOM/GRM observation
  78. GRB 260922A: COLIBRÍ Confirmation of the Optical Counterpart
  79. GRB 260924A: Fermi GRB Observation
  80. Konus-Wind detection of GRB 260921A (possible merger-origin)
  81. GRB 260924A: Fermi-LAT detection of a bright burst
  82. GRB 260924A: AstroSat CZTI detection
  83. GRB 260924A: NOT optical counterpart confirmation
  84. GRB 260924A: detection of a bright optical afterglow by the 1.5m OSN telescope
  85. GRB 260922A: CALET Gamma-Ray Burst Monitor detection
  86. GRB 260924A: Enhanced Swift-XRT position
  87. GRB 260924A: Swift detection of a burst
  88. Trigger_21914: Swift ToO observations (retracted)
  89. GRB 260922A: Ondrejov D50 optical limit
  90. GRB 260922A: Swift-BAT refined analysis
  91. GRB 260922A: Swift/UVOT Upper Limits
  92. GRB 260922A: COLIBRÍ Optical Counterpart Candidate (correction to GCN 45698)
  93. GRB 260922A: COLIBRÍ optical upper limits
  94. GRB 260922A: Swift-XRT refined Analysis
  95. GRB 260922A: Enhanced Swift-XRT position
  96. Fermi-LAT Gamma-ray Observations of IceCube-260805A
  97. GRB 260922A: SVOM/C-GFT optical upper limit
  98. GRB 260922A: Swift detection of a burst
  99. GRB 260921A: AstroSat CZTI detection
  100. GRB 260921A: Swift-BAT refined analysis

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