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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"

21471 results found.

  1. GRB 231215A: Fermi GBM observation
  2. GRB 231215A: CALET Gamma-Ray Burst Monitor detection
  3. GRB 231215A: Swift/UVOT Detection
  4. GRB 231215A: Swift-XRT refined Analysis
  5. GRB 231215A: BOOTES-4/MET optical detection
  6. GRB 231215A: AKO Optical Upper Limit
  7. GRB 231215A: AGILE detection
  8. GRB 231214A: Fermi GBM observation
  9. Konus-Wind detection of GRB 231210B
  10. GRB 231215A: Enhanced Swift-XRT position
  11. GRB 231214A: REM optical/NIR upper limits
  12. GRB 231215A: GROWTH-India optical follow-up
  13. GRB 231215A : Nanshan/HMT optical observations
  14. GRB 231215A: AstroSat CZTI detection
  15. GRB 231215A : MITSuME Akeno optical afterglow candidate detection
  16. GRB 231214A: Swift-XRT refined Analysis
  17. GRB 231215A: Mondy optical bright afterglow detection
  18. GRB 231214A: AstroSat CZTI detection
  19. GRB 231215C: MASTER OT detection
  20. Swift GRB231215.41: Global MASTER-Net observations report
  21. GRB 231215A: Swift-XRT observations
  22. GRB 231215A: Swift detection of a burst
  23. GRB 231214A: Fermi-LAT detection
  24. GRB 231214A: Enhanced Swift-XRT position
  25. GRB 231214B: Swift/BAT-GUANO detection of a burst
  26. GRB231214A: BOOTES-6/DPRT optical upper limit
  27. Swift GRB231214.85: Global MASTER-Net observations report
  28. GRB 231214A: Swift detection of a burst
  29. GRB 231210B: REM optical/NIR upper limits
  30. LIGO/Virgo/KAGRA S231206cc: Upper limits from Swift/BAT-GUANO
  31. LIGO/Virgo/KAGRA S231206ca: Upper limits from Swift/BAT-GUANO
  32. GRB 231210B: MeerLICHT afterglow observations
  33. GRB 231210B: Swift-BAT refined analysis
  34. GRB 231210B: Swift-XRT refined Analysis
  35. GRB 231210B: Enhanced Swift-XRT position
  36. GRB 231210B: VLT/X-shooter redshift
  37. GRB 231210B: detection of the optical counterpart with the LCOGT 40cm telescope at Sutherland Observatory
  38. GRB 231210B: Swift detection of a burst with optical counterpart
  39. Swift GRB231210.90: Global MASTER-Net OT detection
  40. Swift GRB231210.90: Global MASTER-Net observations report
  41. IPN triangulation of GRB 231129C
  42. GRB231205B: Swift/UVOT Upper Limits
  43. GRB 231205B: Swift-BAT refined analysis
  44. GRB 231205B: 1.3m DFOT Optical upper limit
  45. GRB 231205B: optical upper limit in TSHAOand AbAO
  46. GRB 231205B: AGILE detection
  47. GRB 231205B: Ondrejov D50 optical upper limit
  48. GRB 231205B: Swift-XRT refined Analysis
  49. GRB 231205B: REM optical/NIR upper limits
  50. GRB 231129C: ASIM MXGS observation and localization
  51. GRB 231205B: NUTTelA-TAO / BSTI Early Optical Limits
  52. GRB 231205B: r'-band observations from MISTRAL at Observatoire de Haute-Provence
  53. GRB 231205B : MITSuME Akeno optical upper limits
  54. GRB 231205B: Zadko observatory - Gingin optical observations
  55. GRB 231205B: Gaoyazi/GOT optical upper limit
  56. GRB 231205B: Nanshan/HMT optical upper limit
  57. GRB 231205B: GECAM-B detection of a long burst
  58. GRB 231205B: LCOGT Optical Upper Limits
  59. GRB 231205B: Enhanced Swift-XRT position
  60. Swift GRB231205.70: Global MASTER-Net observations report
  61. GRB 231205B: AKO Optical Upper Limit
  62. GRB 231205B: Swift detection of a burst
  63. LIGO/Virgo/KAGRA S231129ac: Upper limits from Swift/BAT-GUANO
  64. GRB 231203A: Fermi GBM Observation
  65. GRB 231203A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  66. Konus-Wind detection of GRB 231129C
  67. GRB 231129C: Swift-XRT afterglow detection
  68. GRB 231129C: PROMPT optical upper limits for the MAXI/GSC X-ray counterpart and the MASTER afterglow candidate
  69. GRB 231129A: VZLUSAT-2 detection
  70. GRB 231129B: Swift-XRT observations
  71. GRB 231129C: AGILE detection
  72. GRB 231129A : MITSuME Akeno optical upper limits
  73. GRB 231129C: Swift/BAT-GUANO localization of a burst outside the coded FOV
  74. GRB 231129A: Swift-BAT refined analysis
  75. GRB 231129C: MASTER OT detection
  76. GRB 231129A: BOOTES-5/JGT optical upper limit
  77. GRB 231129A: JinShan optical upper limit
  78. GRB 231129C: Swift-XRT observations
  79. GRB 231129A: Swift/UVOT Upper Limits
  80. GRB 231129A: optical upper limit in Mondy observatory
  81. GRB 231129C: Tiled Swift observations
  82. GRB 231129A: Enhanced Swift-XRT position
  83. GRB 231129A: Swift-XRT refined Analysis
  84. GRB 231129B: Tiled Swift observations
  85. GRB 231129A: GECAM-C detection of a long burst
  86. GRB 231129A: INTEGRAL detection of a long GRB
  87. GRB 231129A: Swift detection of a burst
  88. GRB 231123C: Fermi GBM Observation
  89. GRB 231123B: Fermi GBM Observation
  90. GRB 231123B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  91. GRB 231111A: Optical follow-up observations at Terskol, AbAO, Maidanak, Mondy, Assy
  92. GRB 231123C: Insight-HXMT/HE detection
  93. GRB 231123C (short): Glowbug gamma-ray detection
  94. GRB230728A: VIRT optical upper limit
  95. GRB230506B: VIRT optical upper limit
  96. GRB 231123C: Swift/BAT-GUANO detection of a short burst likely outside the coded FOV
  97. GRB 231115A: XMM-Newton observation
  98. GRB 231118A: REM optical afterglow detection
  99. GRB 231122B: AstroSat CZTI detection
  100. GRB 231122B: CALET Gamma-Ray Burst Monitor detection

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