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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

1010 results found.

  1. GRB 250302A: Swift/BAT-GUANO localization skymap of a burst
  2. GRB 250311A/EP250311a: TRT optical upper limit
  3. GRB 250311A: Tiled Swift observations
  4. EP250311a/GRB 250311A: EP-WXT detection
  5. GRB 250311A/MAXI J1457-026: MAXI/GSC detection
  6. GRB 250209A: MAXI/GSC detection (possible detection of an X-ray flare from 1RXS J145110.3+310648)
  7. GRB 250207B: Swift-XRT observations
  8. GRB 250207B: Tiled Swift observations
  9. LIGO/Virgo/KAGRA S250206dm: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  10. GRB 250207B: MAXI/GSC detection
  11. LIGO/Virgo/KAGRA S250206dm: Coverage and upper limits from MAXI/GSC observations
  12. LIGO/Virgo/KAGRA S250201i: Coverage and upper limits from MAXI/GSC observations
  13. GRB 250126A: CALET Gamma-Ray Burst Monitor detection
  14. GRB 250126A: MAXI/GSC detection
  15. LIGO/Virgo/KAGRA S241231du: Coverage and upper limit from MAXI/GSC observations
  16. GRB 241218A: Swift/UVOT Upper Limits
  17. GRB 241213B: Swift-XRT observations
  18. GRB 241213B: Tiled Swift observations
  19. GRB 241213B: CALET Gamma-Ray Burst Monitor detection
  20. GRB 241213B: MAXI/GSC detection
  21. GRB 241207C: MASTER optical observations
  22. GRB 241207C: Tiled Swift observations
  23. GRB 241207C: MAXI/GSC detection
  24. LIGO/Virgo/KAGRA S241114bi: Coverage and upper limits from MAXI/GSC observations
  25. LIGO/Virgo/KAGRA S241109bn: Coverage and upper limits from MAXI/GSC observations
  26. EP241101a: Global MASTER-Net observations report
  27. LIGO/Virgo/KAGRA S240915b: Coverage and upper limits from MAXI/GSC observations
  28. LIGO/Virgo/KAGRA S240910ci: Coverage and upper limits from MAXI/GSC observations
  29. LIGO/Virgo/KAGRA S240830gn: Coverage and upper limits from MAXI/GSC observations
  30. GRB 240824B: Ondrejov D50 optical limit
  31. GRB 240824B: Fermi GBM Observation
  32. GRB 240824B: Swift-XRT afterglow detection
  33. GRB 240824B: Swift/BAT arcminute localization of a burst
  34. GRB 240824B: MAXI/GSC detection
  35. GRB 240809B: MAXI/GSC detection
  36. GRB 240712A: Swift-XRT refined Analysis
  37. LIGO/Virgo/KAGRA S240711cm: Coverage and upper limits from MAXI/GSC observations
  38. LIGO/Virgo/KAGRA S240629by: Coverage and upper limits from MAXI/GSC observations
  39. GRB 240514E: A possible candidate BD-21 1074
  40. MAXI GRB240514.78: Global MASTER-Net observations report
  41. GRB 240514E: MAXI/GSC detection of a probable afterglow
  42. LIGO/Virgo/KAGRA S240513cx: Coverage and upper limits from MAXI/GSC observations
  43. LIGO/Virgo/KAGRA S240422ed: Coverage and upper limits from MAXI/GSC observations
  44. GRB 240309A: MAXI/GSC detection
  45. GRB 240225B: Swift-XRT afterglow detection
  46. GRB 240225B: Glowbug gamma-ray detection
  47. IceCube Alert 240229.66: Global MASTER-Net observations report
  48. GRB 240225B: Swift ToO observations
  49. Konus-Wind detection of GRB 240225B (long)
  50. GRB 240225B: VLT/X-shooter redshift
  51. GRB 240225B : MITSuME Akeno optical afterglow candidate detection
  52. GRB 240225B: 3.6m DOT observation
  53. GRB 240225B: NOT optical observations
  54. GRB 240225B: Nanshan/HMT optical afterglow detection
  55. GRB 240225B: CALET Gamma-Ray Burst Monitor detection
  56. GRB 240225B: Swift-XRT observations
  57. GRB 240225B: GOTO detection of a candidate optical afterglow
  58. GRB 240225B: AstroSat CZTI detection
  59. GRB 240225B: Tiled Swift observations
  60. GRB 240225B: MAXI/GSC detection
  61. GRB 240128A: Further Swift-XRT observations
  62. GRB 240214A: Tiled Swift observations
  63. GRB 240214A/1H 0451-560: MAXI/GSC detection
  64. GRB 240128A: Glowbug gamma-ray detection
  65. GRB 240128A: Swift-XRT observations
  66. GRB 240128A: GRBAlpha detection
  67. GRB 240128A: Tiled Swift observations
  68. GRB 240128A: CALET Gamma-Ray Burst Monitor detection
  69. GRB 240128A: MAXI/GSC detection
  70. GRB 240122A: ATCA detection of radio counterpart
  71. GRB240122A: PRIME near infrared detection
  72. GRB 240122A: Swift/UVOT Upper Limits
  73. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  74. GRB 240122A: Swift-XRT afterglow detection
  75. GRB 240122A: VLT/X-shooter redshift confirmation
  76. GRB 240122A: Redshift from OSIRIS+/GTC
  77. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
  78. GRB 240122A: GOTO optical counterpart candidate
  79. GRB 240122A: Tiled Swift observations
  80. GRB 240122A: MAXI/GSC detection
  81. GRB 240107A: VZLUSAT-2 detection
  82. GRB 240114A: MAXI/GSC detection
  83. GRB 240107A: AstroSat CZTI detection
  84. GRB 240107A: MAXI/GSC detection
  85. Fermi trigger No 725806648: Global MASTER-Net observations report
  86. IPN triangulation of GRB 231129C
  87. GRB 231129C: ASIM MXGS observation and localization
  88. Konus-Wind detection of GRB 231129C
  89. GRB 231129C: PROMPT optical upper limits for the MAXI/GSC X-ray counterpart and the MASTER afterglow candidate
  90. GRB 231129B: Swift-XRT observations
  91. GRB 231129C: AGILE detection
  92. GRB 231129C: Swift/BAT-GUANO localization of a burst outside the coded FOV
  93. GRB 231129C: MASTER OT detection
  94. GRB 231129C: Fermi-LAT detection
  95. GRB 231129C: GRBAlpha detection
  96. GRB 231129C: Glowbug gamma-ray detection
  97. GRB 231129C: GECAM-B detection of a bright burst
  98. GRB 231129C: AstroSat CZTI detection
  99. GRB 231129C: CALET Gamma-Ray Burst Monitor detection
  100. GRB 231129C: Fermi GBM Observation of a very bright GRB

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