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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"

36316 results found.

  1. GRB 240809A: KAIT optical observations
  2. GRB 240808A: AstroSat CZTI detection
  3. GRB 240809A: GIT afterglow observations
  4. GRB 240809B: MAXI/GSC detection
  5. GRB 240809A: Swift/UVOT Detection
  6. GRB 240809A: Tentative redshift from NOT
  7. GRB 240809A: Swift-XRT refined Analysis
  8. IPN triangulation of GRB 240807A / EP 240807a
  9. Swift GRB 240809A: Global MASTER-Net observations report
  10. GRB 240809A: JinShan optical observations
  11. GRB 240809A: Enhanced Swift-XRT position
  12. GRB 240809A: Skynet & Photon Ranch Optical Afterglow Observations
  13. GRB 240809A: SVOM/GRM observation
  14. GRB 240808A: SVOM/GRM observation
  15. GRB 240807A: SVOM/GRM observation
  16. GRB 240809A: Swift detection of a burst with a bright optical counterpart
  17. EP-WXT trigger 01709018832: SVOM/C-GFT observations of the star flare
  18. EP240807a: STEP/T80S optical limits
  19. GRB 240807B: AstroSat CZTI detection of a short burst
  20. GRB 240801A: GRBAlpha detection
  21. GRB 240807B: Fermi GBM Final Localization
  22. GRB 240710B: VZLUSAT-2 detection
  23. GRB 240805A: ATCA Radio Upper Limits
  24. EP240807a/GRB 240807A: EP-FXT detection of the X-ray emission
  25. EP-WXT trigger 01709018832: KAIT optical observations of the star flare
  26. EP240802a/GRB240802A: KAIT optical upper limit
  27. GRB 240720B: VZLUSAT-2 detection
  28. GRB 240710A: VZLUSAT-2 detection
  29. GRB 240807A: Fermi GBM Final Localization
  30. GRB 240805B: GIT optical upper limit
  31. EP240806a: KAIT optical observations
  32. GRB 240805B: Swift-BAT refined analysis
  33. GRB 240805A: Swift-BAT refined analysis
  34. EP240804a (GRB 240804B): NOT optical observations
  35. Konus-Wind detection of GRB 240802A (EP240802a)
  36. Improved IPN triangulation of GRB 240802A / EP 240802a
  37. Konus-Wind detection of GRB 240805A
  38. GRB 240805B Bassano Bresciano Observatory upper limit
  39. GRB240805A: Fermi GBM Observation
  40. GRB 240805B: JinShan optical afterglow detection
  41. GRB 240804B/EP240804a: Correction to the GRB name in GCN 37071
  42. GRB 240805B: AbAO, CrAO, and Terskol optical upper limits
  43. Konus-Wind detection of GRB 240804B (a counterpart of EP240804a)
  44. Fermi Gamma-ray Burst Monitor trigger 240806402/744629911 is not a GRB
  45. GRB 240626B: VZLUSAT-2 detection
  46. GRB 240624B: VZLUSAT-2 detection
  47. GRB 240619C: VZLUSAT-2 detection
  48. EP 240806A: LCO optical observations
  49. GRB 240805B: Optical detection with 1.6m Mephisto
  50. GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
  51. GRB 240805B: Swift-XRT refined Analysis
  52. GRB 240805B: Swift/UVOT Upper Limits
  53. GRB 240805A: Swift/UVOT Upper Limits
  54. GRB 240805B: BTA optical afterglow candidate
  55. GRB 240805A: SVOM/GRM observation
  56. GRB 240805B: Enhanced Swift-XRT position
  57. GRB 240805B: LCOGT Optical Upper Limits
  58. Swift GRB 240805B: Global MASTER-Net observations report
  59. GRB 240805B: JinShan optical upper limits
  60. Fermi GRB 240805A: Global MASTER-Net observations report
  61. Swift GRB 240805A: Global MASTER-Net observations report
  62. Fermi Gamma-ray Burst Monitor trigger 744558410/240805574 is not a GRB
  63. GRB 240805A: Swift-XRT refined Analysis
  64. GRB 240805B: Swift detection of a burst
  65. GRB 240805A: Fermi-LAT detection
  66. GRB 240805A: INTEGRAL spectral analysis
  67. EP240801a: Continued optical observations at ZTSh (CraO)
  68. GRB 240805A: A long GRB detected by INTEGRAL
  69. GRB 240805A: Swift detection of a burst
  70. GRB 240805A: Fermi GBM Final Real-time Localization
  71. Fermi GRB 240804A: Global MASTER-Net observations report
  72. EP240802a: Montarrenti Observatory optical upper limit
  73. GRB 240804A: Fermi GBM Final Real-time Localization
  74. IPN triangulation of GRB 240802A / EP 240802a
  75. Fermi Gamma-ray Burst Monitor trigger 744459130/240804425 is not a GRB
  76. EP240802A: Bassano Bresciano Observatory upper limit
  77. GRB 240802A: SVOM/GRM observation
  78. EP240802a: Time coincidence with GRB 240802A and optical upper limits with Kinder observations
  79. GRB 240802A: AstroSat CZTI detection of a long burst
  80. EP240801a: further SAO RAS optical observations
  81. EP240801a: optical observations at CrAO and AbAO
  82. EP240801a: Leavitt Observatory optical observations
  83. EP240801a: SAO RAS optical observations
  84. GRB 240801B: AstroSat CZTI Updated classification - likely a solar flare
  85. GRB 240727C: SVOM/GRM observation
  86. Fermi GBM trigger 744179961 / 240801194 can not be confirmed as a GRB
  87. GRB 240730A: Swift-BAT refined analysis
  88. EP240801a: KAIT optical counterpart observations
  89. GRB 240801B: AstroSat CZTI detection of a bright long burst
  90. Fermi GRB 240801A: Global MASTER-Net observations report
  91. GRB 240801A: Fermi GBM Final Real-time Localization
  92. GRB 240730C: AstroSat CZTI detection of a long burst
  93. GRB 240731A: Fermi GBM Final Localization
  94. GRB 240731A: AstroSat CZTI detection
  95. GRB 240730A: Osservatorio Astronomico Nastro Verde upper limit
  96. GRB240730A: BOOTES-5/JGT early optical upper limit
  97. Fermi Gamma-ray Burst Monitor trigger 744061103/240730818 is not a GRB
  98. Fermi GRB 240730B: Global MASTER-Net observations report
  99. GRB 240730B: Fermi GBM Final Real-time Localization
  100. Swift GRB 240730A: Global MASTER-Net observations report

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