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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"

2983 results found.

  1. GRB 180614A: Enhanced Swift-XRT position
  2. GRB 180614A: Swift detection of a burst
  3. IPN Triangulation of GRB 180529A (short/hard)
  4. IPN Triangulation of GRB 180526A (long)
  5. GRB 180505A: AstroSat CZTI detection
  6. GRB 180505A: Fermi GBM detection
  7. GRB 180425A: Enhanced Swift-XRT position
  8. GRB 180425A: Swift detection of a burst
  9. GRB 180418A: Swift detection of a short burst
  10. GRB 180402A: Swift detection of a possibly short burst
  11. GRB 180331A: Swift-BAT refined analysis
  12. GRB 180329B: Swift-BAT refined analysis
  13. Swift Trigger 819863 is not a GRB
  14. Konus-Wind observation of GRB 180316A
  15. GRB 180316A: Swift detection of a burst
  16. GRB 180314A: Swift-BAT refined analysis
  17. IPN Triangulation of GRB 180223A (long)
  18. GRB180205A: Optical observations with DOAO 1m telescope
  19. LIGO/Virgo G298048 GRAWITA: VST-ESO PARANAL follow up of AT2017gfo
  20. GRB 180115A: Swift-BAT refined analysis
  21. GRB 180116A: MAXI/GSC detection
  22. GRB 180113A: KAIT Optical Observations
  23. GMRT Radio detection of GRB 171205A
  24. GRB 171212A: Swift detection of a burst or a Galactic transient
  25. GRB 171211A: Swift-BAT refined analysis
  26. Swift Trigger 796115 is probably not a GRB
  27. GRB 171205A: GOTO detection of the optical counterpart
  28. GRB 171120A: Swift-BAT refined analysis
  29. GRB 171112A: MAXI/GSC detection
  30. GRB 171010A: afterglow and SN 2017htp optical observations
  31. GRB 171030A: MASTER inspection of the IPN error box of the short GRB.
  32. GRB 171027A, Swift-BAT refined analysis
  33. GRB 171027A: MASTER-OAFA (Argentina) early prompt optical observations
  34. GRB 171013A: Swift detection of a possible burst
  35. GRB 171007A: Fermi GBM observation
  36. GRB 171007A: Swift detection of a burst
  37. 3.6m Devasthal Optical Telescope observations of GRB 170428A
  38. LIGO/Virgo G297595: NIR Observations following GW170814
  39. LIGO/Virgo G298048: AST3-2 observations of SSS17a/DLT17ck from Antarctica
  40. GRB 170912B: Swift/UVOT Upper Limits
  41. LIGO/Virgo G297595: Las Cumbres Observatory Optical Follow-Up
  42. GRB 170906A: Swift-BAT refined analysis
  43. GRB 170906C: Swift-BAT refined analysis
  44. GRB 170906B: Swift detection of a burst
  45. LIGO/VIRGO G298048: Radio detection of SSS17a at 6 GHz with the VLA
  46. LIGO/Virgo G297595: DECam observations of BBH merger region of interest
  47. LIGO/Virgo G299232: GRAWITA Campo Imperatore optical observations
  48. LIGO/Virgo G298048: OVRO 40m telescope follow-up
  49. LIGO/Virgo G298048: Zadko Telescope 7 day observations of the OT candidate SSS17a/DLT17ck
  50. IPN Triangulation of GRB 170826A (short)
  51. LIGO/Virgo G299232: Optical Transient Discovery by Swift/UVOT
  52. LIGO/Virgo G299232: Transient near NGC 1343 has a somewhat blue r-i color
  53. LIGO/Virgo G298936: CALET Observations
  54. LIGO/Virgo G298936 TAROT/TZAC observations
  55. LIGO/Virgo G298048: MASTER Global-Net early optical observations and the Possible KiloNova SSS17a in NGC 4993 photometry and merging rate
  56. LIGO/Virgo G298048: HAWC follow-up
  57. Konus-Wind observation of GRB 170822A
  58. LIGO/Virgo G298048: Results of the ASKAP search for fast radio bursts
  59. LIGO/Virgo G298936: IceCube neutrino observations
  60. LIGO/Virgo G298048: TOROS optical counterpart search
  61. LIGO/Virgo G298048: Further VLA Observations
  62. LIGO/Virgo G298048: HSC observations of the OT candidate of G298048
  63. LIGO/Virgo G298048: ASKAP search for fast radio bursts
  64. LIGO/Virgo G298048: TZAC TAROT Reunion (TRE) observations
  65. LIGO/Virgo G298048: REM optical/NIR observations
  66. LIGO/Virgo G298048: IPN triangulation of Fermi/GBM trigger 524666471/170817529
  67. LIGO/Virgo G297595: Subaru Hyper Suprime-Cam follow-up observations
  68. LIGO/Virgo G297595: REM optical/NIR observations
  69. LIGO/Virgo G297595: Fermi GBM Observations
  70. GRB 170808A: MAXI/GSC detection
  71. GRB 170803A: Swift-BAT refined analysis
  72. GRB 170728B, Swift-BAT refined analysis
  73. GRB 170728A: Swift-BAT refined analysis
  74. Swift triggers on a new galactic source: Swift J181723.1-164300
  75. GRB 170714A, Swift-BAT refined analysis
  76. GRB 170705A: MASTER-OAFA early OT observations
  77. GRB 170626B CALET Gamma-Ray Burst Monitor detection
  78. GRB 170626A: SAO RAS confirmation of OT fading
  79. GRB 170626A: Swift-BAT refined analysis
  80. GRB 170626A: SAO RAS possible OT detection
  81. GRB 170626B: The first GRB detected by the Insight-HXMT X-ray Telescope (revised)
  82. GRB170612.87 MASTER-Net OT detection
  83. GRB 170607A: Swift-BAT refined analysis
  84. LIGO/Virgo G288732:SVOM/Mini-GWAC observations of the initial skymap
  85. GRB 170531A: Swift detection of a burst
  86. GRB 170519A: CrAO optical observations
  87. Konus-Wind observation of GRB 170527A
  88. GRB 170519A: ISON/Multa optical observations
  89. LIGO/Virgo G268556: optical observations and classification of Pan-STARRS1 transients
  90. GRB 170524A: Swift-BAT refined analysis
  91. LIGO/Virgo G277583: UH88/SNIFS classification of ATLAS and PS1 transients
  92. GRB 170516A: Swift-BAT refined analysis
  93. GRB 170428A: GROND detection of the afterglow
  94. GRB 170424A: Fermi-LAT detection
  95. GRB 170403B CALET Gamma-Ray Burst Monitor detection
  96. GRB 170331A: Swift-BAT refined analysis
  97. DOAO 1m telescope V, R, I observation of GRB 170317A
  98. IPN Triangulation of GRB 170320A (long/intense)
  99. Search for counterpart to IceCube-170321A with ANTARES
  100. GRB 170317A: Mondy optical observations

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