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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"

8518 results found.

  1. GRB 180115A: Swift detection of a burst with an optical counterpart.
  2. GRB 180113A: KAIT Optical Observations
  3. GRB 180111A: Swift detection of a burst with an optical counterpart
  4. GRB 171230A CALET Gamma-Ray Burst Monitor detection
  5. GRB 180103A: Swift ToO observations
  6. GRB 180102A: Swift detection of a burst
  7. IceCube-171106A: Konus-Wind upper limits
  8. IceCube-171015A: Konus-Wind upper limits
  9. IceCube-170922A: Konus-Wind upper limits
  10. GRB 171210A CALET Gamma-Ray Burst Monitor detection
  11. GRB 171222A: Swift detection of a burst
  12. GRB 171216A: Swift detection of a burst
  13. GRB 171212A: Swift detection of a burst or a Galactic transient
  14. GRB 171210A: Swift-XRT and UVOT observations
  15. GRB 171210A: Swift ToO observations
  16. GRB 171209A: Enhanced Swift-XRT position
  17. Swift Trigger 796115 is probably not a GRB
  18. GRB 171205A: UKIRT near-IR observations
  19. GRB 171209A: LCO 1-m telescope observations
  20. GRB 171209A: Swift detection of a burst
  21. GRB171205A hyperluminal radio afterglow?
  22. GRB 171205A: Swift detection of a burst
  23. Pan-STARRS follow-up of IceCube-171106A
  24. LIGO/Virgo G299232: LOFAR follow-up
  25. GRB 171124A: Swift ToO observations
  26. GRB 171123A: Swift detection of a burst
  27. GRB 171120A: Swift detection of a burst
  28. GRB 171115A: Swift detection of a burst
  29. HAWC follow-up of IceCube-171106A
  30. INTEGRAL observation of IceCube-171106A
  31. GRB 171030A: MASTER OT J034412.48-263556.5 featureless continuum spectrum from Lijiang 2.4m (China) telescope and 2m the Himalayan Chandra
  32. Fermi-GBM Trigger 531686417 / 171106778 is not related to ICECUBE-171106A
  33. IceCube-171106A - IceCube observation of a high-energy neutrino candidate
  34. GRB 171010A: VLT spectroscopic identification of the associated SN 2017htp
  35. GRB 171102B: Swift detection of a burst
  36. GRB 171030A: Swift ToO observations
  37. Swift Trigger 783893 is probably not a GRB
  38. Retraction of high energy neutrino candidate IceCube-171028
  39. GRB 171027A: VLT optical upper limits
  40. GRB 171027A: LCO 1-m telescope observations
  41. GRB 171027A: RATIR Detection of a NIR Afterglow Candidate
  42. GRB 171027A: Swift detection of a burst
  43. Numerous Fermi-GBM Subthreshold Notices are due to Swift J0243.6+6
  44. GRB 171020A: Swift detection of a burst
  45. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  46. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  47. Search for counterpart to IceCube-171015A with ANTARES
  48. INTEGRAL SPI-ACS observation of IceCube-171015A
  49. Swift trigger 779171 is probably a noise fluctuation
  50. IceCube-171015A - IceCube observation of a high-energy neutrino candidate event
  51. GRB 171010A : Optical observations from HCT
  52. GRB 171010A: RATIR Optical and NIR Observations
  53. GRB 171013A: Swift detection of a possible burst
  54. GRB 171010B: Swift ToO observations
  55. GRB 171010A: optical observations
  56. GRB 171010A: Swift ToO observations
  57. GRB 171007A: Swift detection of a burst
  58. GRB 171004A: Swift detection of a burst
  59. LIGO/Virgo G299232: LOFAR follow-up
  60. GRB 171003A: Swift detection of a burst or a Galactic Transient
  61. GRB 171001A: Swift detection of a burst
  62. 3.6m Devasthal Optical Telescope observations of GRB 170428A
  63. LIGO/Virgo G298048: Summary of Pi of the Sky observations
  64. IceCube-170922A: HAWC follow-up
  65. Search for counterpart to IceCube-170922A with ANTARES
  66. GRB 170921B: AstroSat CZTI detection
  67. LIGO/Virgo G298048: Effelsberg 100-m Radio Telescope observations of SSS17a
  68. INTEGRAL SPI-ACS observation of AMON IceCube-170922A
  69. IceCube-170922A - IceCube observation of a high-energy neutrino candidate event
  70. GRB 170921B: Fermi GBM detection
  71. GRB 170921A: Swift detection of a burst
  72. LIGO/Virgo G297595: PIRATE observations
  73. LIGO/Virgo G299232: Khureltogot observations
  74. GRB 170912B: Swift detection of a burst
  75. GRB 170912A: Swift detection of a burst
  76. LIGO/Virgo G298048 GRAWITA: VST-ESO PARANAL follow up of SSS17a in NGC4993.
  77. GRB 170906B: Swift detection of a burst
  78. GRB 170906A: Swift detection of a burst with an optical afterglow
  79. LIGO/Virgo G298389: Fermi GBM Flux Upper Limits
  80. LIGO/Virgo G299232: LOFAR follow-up
  81. Swift Triggers on MAXI J1535-571
  82. GRB 170902A: Swift detection of a burst or possible Galactic transient
  83. LIGO/Virgo G298936: PIRATE observations
  84. LIGO/Virgo G299232 ANTARES search (2)
  85. LIGO/Virgo G298048: Discovery of X-ray emission from SSS17a in NGC4993
  86. LIGO/Virgo G298048: OVRO 40m telescope follow-up
  87. LIGO/Virgo G298936: Updated localization from parameter estimation on LIGO and Virgo data
  88. LIGO/Virgo G296853: PIRATE observations
  89. LIGO/Virgo G298048: ALMA observations
  90. LIGO/Virgo G298048: Zadko Telescope 7 day observations of the OT candidate SSS17a/DLT17ck
  91. LIGO/Virgo G298936: HAWC follow-up
  92. LIGO/Virgo G299232 TZAC/TAROT observations
  93. GROND observations of GRB170827A
  94. GRB 170827A: ePESSTO NTT afterglow candidate
  95. LIGO/Virgo G299232: Transient near NGC 1343 has a somewhat blue r-i color
  96. GRB 170827A: REM optical/NIR observations
  97. LIGO/Virgo G299232: Astrosat CZTI upper limits
  98. LIGO/VIRGO G299232: Fermi GBM Observations
  99. LIGO/Virgo G299232 : Fermi-LAT search for high-energy gamma-ray counterpart
  100. LIGO/Virgo G299232: AGILE MCAL detection of a short gamma-ray candidate

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