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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"

36313 results found.

  1. GRB 240809B: MAXI/GSC detection
  2. GRB 240809A: Swift/UVOT Detection
  3. GRB 240809A: Tentative redshift from NOT
  4. GRB 240809A: Swift-XRT refined Analysis
  5. IPN triangulation of GRB 240807A / EP 240807a
  6. Swift GRB 240809A: Global MASTER-Net observations report
  7. GRB 240809A: JinShan optical observations
  8. GRB 240809A: Enhanced Swift-XRT position
  9. GRB 240809A: Skynet & Photon Ranch Optical Afterglow Observations
  10. GRB 240809A: SVOM/GRM observation
  11. GRB 240808A: SVOM/GRM observation
  12. GRB 240807A: SVOM/GRM observation
  13. GRB 240809A: Swift detection of a burst with a bright optical counterpart
  14. EP-WXT trigger 01709018832: SVOM/C-GFT observations of the star flare
  15. EP240807a: STEP/T80S optical limits
  16. GRB 240807B: AstroSat CZTI detection of a short burst
  17. GRB 240801A: GRBAlpha detection
  18. GRB 240807B: Fermi GBM Final Localization
  19. GRB 240710B: VZLUSAT-2 detection
  20. GRB 240805A: ATCA Radio Upper Limits
  21. EP240807a/GRB 240807A: EP-FXT detection of the X-ray emission
  22. EP-WXT trigger 01709018832: KAIT optical observations of the star flare
  23. EP240802a/GRB240802A: KAIT optical upper limit
  24. GRB 240720B: VZLUSAT-2 detection
  25. GRB 240710A: VZLUSAT-2 detection
  26. GRB 240807A: Fermi GBM Final Localization
  27. GRB 240805B: GIT optical upper limit
  28. EP240806a: KAIT optical observations
  29. GRB 240805B: Swift-BAT refined analysis
  30. GRB 240805A: Swift-BAT refined analysis
  31. EP240804a (GRB 240804B): NOT optical observations
  32. Konus-Wind detection of GRB 240802A (EP240802a)
  33. Improved IPN triangulation of GRB 240802A / EP 240802a
  34. Konus-Wind detection of GRB 240805A
  35. GRB 240805B Bassano Bresciano Observatory upper limit
  36. GRB240805A: Fermi GBM Observation
  37. GRB 240805B: JinShan optical afterglow detection
  38. GRB 240804B/EP240804a: Correction to the GRB name in GCN 37071
  39. GRB 240805B: AbAO, CrAO, and Terskol optical upper limits
  40. Konus-Wind detection of GRB 240804B (a counterpart of EP240804a)
  41. Fermi Gamma-ray Burst Monitor trigger 240806402/744629911 is not a GRB
  42. GRB 240626B: VZLUSAT-2 detection
  43. GRB 240624B: VZLUSAT-2 detection
  44. GRB 240619C: VZLUSAT-2 detection
  45. EP 240806A: LCO optical observations
  46. GRB 240805B: Optical detection with 1.6m Mephisto
  47. GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
  48. GRB 240805B: Swift-XRT refined Analysis
  49. GRB 240805B: Swift/UVOT Upper Limits
  50. GRB 240805A: Swift/UVOT Upper Limits
  51. GRB 240805B: BTA optical afterglow candidate
  52. GRB 240805A: SVOM/GRM observation
  53. GRB 240805B: Enhanced Swift-XRT position
  54. GRB 240805B: LCOGT Optical Upper Limits
  55. Swift GRB 240805B: Global MASTER-Net observations report
  56. GRB 240805B: JinShan optical upper limits
  57. Fermi GRB 240805A: Global MASTER-Net observations report
  58. Swift GRB 240805A: Global MASTER-Net observations report
  59. Fermi Gamma-ray Burst Monitor trigger 744558410/240805574 is not a GRB
  60. GRB 240805A: Swift-XRT refined Analysis
  61. GRB 240805B: Swift detection of a burst
  62. GRB 240805A: Fermi-LAT detection
  63. GRB 240805A: INTEGRAL spectral analysis
  64. EP240801a: Continued optical observations at ZTSh (CraO)
  65. GRB 240805A: A long GRB detected by INTEGRAL
  66. GRB 240805A: Swift detection of a burst
  67. GRB 240805A: Fermi GBM Final Real-time Localization
  68. Fermi GRB 240804A: Global MASTER-Net observations report
  69. EP240802a: Montarrenti Observatory optical upper limit
  70. GRB 240804A: Fermi GBM Final Real-time Localization
  71. IPN triangulation of GRB 240802A / EP 240802a
  72. Fermi Gamma-ray Burst Monitor trigger 744459130/240804425 is not a GRB
  73. EP240802A: Bassano Bresciano Observatory upper limit
  74. GRB 240802A: SVOM/GRM observation
  75. EP240802a: Time coincidence with GRB 240802A and optical upper limits with Kinder observations
  76. GRB 240802A: AstroSat CZTI detection of a long burst
  77. EP240801a: further SAO RAS optical observations
  78. EP240801a: optical observations at CrAO and AbAO
  79. EP240801a: Leavitt Observatory optical observations
  80. EP240801a: SAO RAS optical observations
  81. GRB 240801B: AstroSat CZTI Updated classification - likely a solar flare
  82. GRB 240727C: SVOM/GRM observation
  83. Fermi GBM trigger 744179961 / 240801194 can not be confirmed as a GRB
  84. GRB 240730A: Swift-BAT refined analysis
  85. EP240801a: KAIT optical counterpart observations
  86. GRB 240801B: AstroSat CZTI detection of a bright long burst
  87. Fermi GRB 240801A: Global MASTER-Net observations report
  88. GRB 240801A: Fermi GBM Final Real-time Localization
  89. GRB 240730C: AstroSat CZTI detection of a long burst
  90. GRB 240731A: Fermi GBM Final Localization
  91. GRB 240731A: AstroSat CZTI detection
  92. GRB 240730A: Osservatorio Astronomico Nastro Verde upper limit
  93. GRB240730A: BOOTES-5/JGT early optical upper limit
  94. Fermi Gamma-ray Burst Monitor trigger 744061103/240730818 is not a GRB
  95. Fermi GRB 240730B: Global MASTER-Net observations report
  96. GRB 240730B: Fermi GBM Final Real-time Localization
  97. Swift GRB 240730A: Global MASTER-Net observations report
  98. GRB 240730A: Swift-XRT refined Analysis
  99. GRB 240715A: Swift-XRT afterglow detection
  100. GRB 240730A: KAIT Optical Upper Limit

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