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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"

23739 results found.

  1. GRB 231210B: Swift-BAT refined analysis
  2. IceCube Alert 231211.03: Global MASTER-Net observations report
  3. GRB 231210B: Swift-XRT refined Analysis
  4. GRB 231210B: detection of the optical counterpart with the LCOGT 40cm telescope at Sutherland Observatory
  5. Fermi trigger No 723906955: Global MASTER-Net observations report
  6. GRB 231210B: Swift detection of a burst with optical counterpart
  7. Swift GRB231210.90: Global MASTER-Net OT detection
  8. Swift GRB231210.90: Global MASTER-Net observations report
  9. IPN triangulation of GRB 231129C
  10. GRB 231208A: GRBAlpha detection
  11. GRB231205B: Swift/UVOT Upper Limits
  12. GRB 231208A: Glowbug gamma-ray detection
  13. GRB 231205B: Swift-BAT refined analysis
  14. LIGO/Virgo/KAGRA S231206cc: Identification of a GW compact binary merger candidate
  15. LIGO/Virgo/KAGRA S231206ca: Identification of a GW compact binary merger candidate
  16. GRB 231205B: AGILE detection
  17. Fermi trigger No 723581802: Global MASTER-Net observations report
  18. GRB 231206B: Fermi GBM Final Real-time Localization
  19. GRB 231205B: Swift-XRT refined Analysis
  20. GRB 231205B: REM optical/NIR upper limits
  21. GRB 231129C: ASIM MXGS observation and localization
  22. GRB 231205B: NUTTelA-TAO / BSTI Early Optical Limits
  23. GRB 231206A: GECAM-B detection of a short burst (correction)
  24. GRB 231205B : MITSuME Akeno optical upper limits
  25. GRB 231206A: GECAM-B detection of a short burst
  26. GRB 231205B: Gaoyazi/GOT optical upper limit
  27. GRB 231205B: Nanshan/HMT optical upper limit
  28. GRB 231205B: LCOGT Optical Upper Limits
  29. GRB 231205A: DDOTI Upper Limits on the Afterglow
  30. LIGO/Virgo/KAGRA S231205c: One counterpart neutrino candidate event from an IceCube neutrino search
  31. GRB 231204A: Glowbug gamma-ray detection
  32. Swift GRB231205.70: Global MASTER-Net observations report
  33. GRB 231204A: CALET Gamma-Ray Burst Monitor detection
  34. GRB 231205B: Swift detection of a burst
  35. GRB 231205A: GECAM-B detection of a short burst
  36. Fermi trigger No 723435916: Global MASTER-Net observations report
  37. Fermi trigger No 723326169: Global MASTER-Net observations report
  38. Fermi trigger No 723412808: Global MASTER-Net observations report
  39. Konus-Wind detection of GRB 231129C
  40. Fermi trigger No 723279695: Global MASTER-Net observations report
  41. GRB 231129C: Swift-XRT afterglow detection
  42. Fermi trigger No 723149952: Global MASTER-Net observations report
  43. GRB 231129C: PROMPT optical upper limits for the MAXI/GSC X-ray counterpart and the MASTER afterglow candidate
  44. GRB 231129A: VZLUSAT-2 detection
  45. GRB 231128A: VZLUSAT-2 detection
  46. GRB 231129C: AGILE detection
  47. GRB 231129A : MITSuME Akeno optical upper limits
  48. GRB 231129A: Swift-BAT refined analysis
  49. GRB 231129C: MASTER OT detection
  50. GRB 231129A: BOOTES-5/JGT optical upper limit
  51. GRB 231129C: Fermi-LAT detection
  52. GRB 231129C: GRBAlpha detection
  53. GRB 231129C: Glowbug gamma-ray detection
  54. GRB 231129C: Swift-XRT observations
  55. GRB 231129C: CALET Gamma-Ray Burst Monitor detection
  56. GRB 231129C: Fermi GBM Observation of a very bright GRB
  57. GRB 231129C: iTelescope likely optical afterglow AT 2023yph discovery
  58. GRB 231127A: GRBAlpha detection
  59. GRB 231129C: MAXI/GSC detection
  60. GRB 231129A: Enhanced Swift-XRT position
  61. Fermi trigger No 722977823: Global MASTER-Net observations report
  62. GRB 231129B: MAXI/GSC detection
  63. Integral GRB231129.21: Global MASTER-Net observations report
  64. GRB 231129A: GECAM-C detection of a long burst
  65. GRB 231129A: Swift detection of a burst
  66. LIGO/Virgo/KAGRA S231127cg: Identification of a GW compact binary merger candidate
  67. GRB 231127A: CALET Gamma-Ray Burst Monitor detection
  68. GRB 231125A: GRBAlpha detection
  69. GRB 231125A: CALET Gamma-Ray Burst Monitor detection
  70. GRB 231125A (short): Glowbug gamma-ray detection
  71. GRB 231124A: GRBAlpha detection
  72. Fermi trigger No 722653947: Global MASTER-Net observations report
  73. Fermi trigger No 722460326: Global MASTER-Net observations report
  74. Fermi trigger No 722507896: Global MASTER-Net observations report
  75. GRB 231123C (short): Glowbug gamma-ray detection
  76. GRB 231124A: Glowbug gamma-ray detection
  77. Fermi trigger No 722462310: Global MASTER-Net observations report
  78. GRB 231124A: CALET Gamma-Ray Burst Monitor detection
  79. GRB 231115A: XMM-Newton observation
  80. GRB 231123A: AstroSat CZTI detection
  81. Fermi trigger No 722400249: Global MASTER-Net observations report
  82. GRB 231118A: REM optical afterglow detection
  83. GRB 231122B: AstroSat CZTI detection
  84. GRB 231122B: CALET Gamma-Ray Burst Monitor detection
  85. GRB 231122B: Glowbug gamma-ray detection
  86. GRB 231117A: Continued GTC Observations
  87. Fermi trigger No 722349867: Global MASTER-Net observations report
  88. GRB 231122A: GECAM detection
  89. GRB 231122B: GECAM detection
  90. GRB 231117A: GTC Near-Infrared Observations
  91. GRB 231117A: Swift-BAT refined analysis
  92. GRB 231118A: GRBAlpha detection
  93. GRB 231118A: VZLUSAT-2 detection
  94. GRB 231118A: Swift-BAT refined analysis
  95. Konus-Wind detection of GRB 231020A
  96. GRB 231117A: LDT Confirmation of Optical Fading
  97. GRB 231118B: CALET Gamma-Ray Burst Monitor detection
  98. GRB 231117A: CALET Gamma-Ray Burst Monitor detection
  99. GRB 231117A : MITSuME Akeno optical afterglow candidate detection
  100. GRB 231118B: Fermi GBM observation

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