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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"

4046 results found.

  1. Fermi Trigger 554765006: MASTER optical inspection
  2. GRB 180728B: GOTO optical search over IPN region
  3. GRB 180728B: MASTER optical observations short GRB IPN error box
  4. Konus-Wind observation of the bright nearby GRB 180728A
  5. IPN Triangulation of GRB 180728B (short)
  6. GRB 180728A: VLT/X-shooter redshift of a nearby energetic GRB
  7. GRB 180728A: Fermi GBM observation
  8. GRB 180728A: MASTER OT (= new object) detection
  9. GRB 180728A: Swift detection of a bright burst
  10. ANTARES neutrino Alert180713.02: MASTER optical observation
  11. GRB 180718A: MASTER optical observation
  12. IceCube-171106A: MASTER optical observation
  13. GRB 180706A: TSHAO optical observations
  14. Fermi GBM triggers 552488966/180705548 and 552490104/180705561 are not GRBs
  15. GRB 180705A: MASTER optical observation
  16. GRB 180626C: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 551697835)
  17. IPN Triangulation of GRB 180626B (short)
  18. Konus-Wind observation of GRB 180620A
  19. GRB 180611A: AstroSat CZTI detection
  20. GRB 180529A: AstroSat CZTI detection
  21. GRB 180614A: MASTER observation
  22. Konus-Wind observation of GRB 180611A
  23. GRB 180611A: Fermi GBM observation
  24. IPN Triangulation of GRB 180611A (long)
  25. Konus-Wind observation of GRB 180529A
  26. GRB 180529A: CALET Gamma-Ray Burst Monitor detection
  27. IPN Triangulation of GRB 180529A (short/hard)
  28. AGILE/MCAL detection of GRB 180529 and a possible precursor
  29. IPN Triangulation of GRB 180523A
  30. GRB 180510A: MITSuME Ishigakijima optical upper limits
  31. Retraction of IceCube GCN/AMON NOTICE 71165249_130949
  32. GRB 180407A: Swift detection of a burst
  33. Konus-Wind observation of GRB 180404B
  34. GRB 180404B: MASTER-OAFA OT observation
  35. GRB 180325A: Swift/UVOT Detection
  36. Konus-Wind observation of GRB 180316A
  37. GRB 180325A: Swift detection of a burst with an optical counterpart
  38. GRB 180324A: Swift detection of a burst
  39. GRB 180316A: Swift-BAT refined analysis
  40. GRB 180314A: VLT/X-shooter redshift
  41. GRB 180314A: Swift/UVOT Detection
  42. GRB 180314A: Enhanced Swift-XRT position
  43. GRB 180314A: Swift detection of a burst with an optical counterpart
  44. GRB 180311A, Swift-BAT refined analysis
  45. GRB 180311A: Enhanced Swift-XRT position
  46. GRB 180311A: Prompt enhanced Swift-XRT position
  47. GRB 180311A: Swift detection of a burst
  48. GRB 180210A: Insight-HXMT/HE observation
  49. GRB180224A: Global MASTER-Net bright OT detection
  50. GRB 180221B CALET Gamma-Ray Burst Monitor detection
  51. GRB 180112A: AstroSat CZTI detection
  52. GRB 180205A: BAO optical observations
  53. GRB 180205A: AbAO optical observations
  54. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  55. GRB 180205A: VLT polarimetry
  56. GRB 180205A: Mondy optical observations
  57. GRB 180120A: Fermi GBM Detection
  58. GRB 180112A CALET Gamma-Ray Burst Monitor detection
  59. IPN Triangulation of GRB 180113B
  60. GRB 180116A: MAXI/GSC detection
  61. Konus-Wind observation of GRB 180113A
  62. GRB 171229A CALET Gamma-Ray Burst Monitor detection
  63. GRB 171216A: Enhanced Swift-XRT position
  64. GRB 171216A: Swift detection of a burst
  65. Swift Trigger 797070 is probably not a GRB
  66. GRB 171210A: Swift-XRT and UVOT observations
  67. GRB 171211A: Swift detection of a possibly short burst
  68. GRB 171205A: iTelescope optical observations
  69. Swift Trigger 796098 is probably a noise peak near M31
  70. GRB 171030A: MASTER inspection of the IPN error box of the short GRB.
  71. GRB 171102B: Swift detection of a burst
  72. GRB 171030A: Fermi GBM detection
  73. GRB 171030A: Swift non-localization with BAT, XRT and UVOT
  74. IPN Triangulation of GRB 171030A (short)
  75. Swift Triggers 784159 and 784160 are not bursts
  76. Swift Trigger 783893: LCO 1-m telescope observations
  77. Swift Trigger 783893 is probably not a GRB
  78. GRB 171027A: LCO 1-m telescope observations
  79. GRB 171027A: MASTER-OAFA (Argentina) early prompt optical observations
  80. IPN Triangulation of GRB 171022A
  81. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  82. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  83. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  84. Trigger 779351: Swift detection of Swift J0243.6+6124
  85. GRB 171010A: MITSuME Akeno Optical Observation
  86. LIGO/Virgo G299232: MAGIC Cherenkov Telescopes observations
  87. LIGO/Virgo G298048: Record of all e-MERLIN results to date on SSS17a
  88. GRB 170728B: Kottamia R-band observation
  89. LIGO/Virgo G298048: Summary of Pi of the Sky observations
  90. LIGO/Virgo G297595: NIR Observations following GW170814
  91. LIGO/Virgo G299232: Swift-XRT sources
  92. GRB 170829A: Insight-HXMT detection
  93. IPN Triangulation of GRB 170904A (long/very bright)
  94. LIGO/Virgo G297595: DECam observations of BBH merger region of interest
  95. LIGO/Virgo G298048: Possible Plateau in Ks band revealed by continued Gemini-South observations
  96. LIGO/Virgo G299232: GRAWITA Asiago optical observations
  97. LIGO/Virgo G299232: SVOM/2.16-m Optical Telescope Observations of Swift UVOT Transient
  98. GRB 170830A: MAXI/GSC detection
  99. LIGO/Virgo G299232: WHT non-detection u-band optical transient
  100. LIGO/Virgo G299232: Liverpool Telescope observations

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