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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"

8523 results found.

  1. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  2. GRB 180205A: Swift detection of a burst with a bright optical counterpart
  3. GRB 180204A: Swift detection of a short burst
  4. GRB 180115A: MITSuME Akeno optical upper limits
  5. GRB 180113A: Swift ToO observations
  6. GRB 180115A: Swift detection of a burst with an optical counterpart.
  7. GRB 180113A: KAIT Optical Observations
  8. GRB 180111A: Swift detection of a burst with an optical counterpart
  9. GRB 171230A CALET Gamma-Ray Burst Monitor detection
  10. GRB 180103A: Swift ToO observations
  11. GRB 180102A: Swift detection of a burst
  12. IceCube-171106A: Konus-Wind upper limits
  13. IceCube-171015A: Konus-Wind upper limits
  14. IceCube-170922A: Konus-Wind upper limits
  15. GRB 171210A CALET Gamma-Ray Burst Monitor detection
  16. GRB 171222A: Swift detection of a burst
  17. GRB 171216A: Swift detection of a burst
  18. GRB 171212A: Swift detection of a burst or a Galactic transient
  19. GRB 171210A: Swift-XRT and UVOT observations
  20. GRB 171210A: Swift ToO observations
  21. GRB 171209A: Enhanced Swift-XRT position
  22. Swift Trigger 796115 is probably not a GRB
  23. GRB 171205A: UKIRT near-IR observations
  24. GRB 171209A: LCO 1-m telescope observations
  25. GRB 171209A: Swift detection of a burst
  26. GRB171205A hyperluminal radio afterglow?
  27. GRB 171205A: Swift detection of a burst
  28. Pan-STARRS follow-up of IceCube-171106A
  29. LIGO/Virgo G299232: LOFAR follow-up
  30. GRB 171124A: Swift ToO observations
  31. GRB 171123A: Swift detection of a burst
  32. GRB 171120A: Swift detection of a burst
  33. GRB 171115A: Swift detection of a burst
  34. HAWC follow-up of IceCube-171106A
  35. INTEGRAL observation of IceCube-171106A
  36. GRB 171030A: MASTER OT J034412.48-263556.5 featureless continuum spectrum from Lijiang 2.4m (China) telescope and 2m the Himalayan Chandra
  37. Fermi-GBM Trigger 531686417 / 171106778 is not related to ICECUBE-171106A
  38. IceCube-171106A - IceCube observation of a high-energy neutrino candidate
  39. GRB 171010A: VLT spectroscopic identification of the associated SN 2017htp
  40. GRB 171102B: Swift detection of a burst
  41. GRB 171030A: Swift ToO observations
  42. Swift Trigger 783893 is probably not a GRB
  43. Retraction of high energy neutrino candidate IceCube-171028
  44. GRB 171027A: VLT optical upper limits
  45. GRB 171027A: LCO 1-m telescope observations
  46. GRB 171027A: RATIR Detection of a NIR Afterglow Candidate
  47. GRB 171027A: Swift detection of a burst
  48. Numerous Fermi-GBM Subthreshold Notices are due to Swift J0243.6+6
  49. GRB 171020A: Swift detection of a burst
  50. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  51. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  52. Search for counterpart to IceCube-171015A with ANTARES
  53. INTEGRAL SPI-ACS observation of IceCube-171015A
  54. Swift trigger 779171 is probably a noise fluctuation
  55. IceCube-171015A - IceCube observation of a high-energy neutrino candidate event
  56. GRB 171010A : Optical observations from HCT
  57. GRB 171010A: RATIR Optical and NIR Observations
  58. GRB 171013A: Swift detection of a possible burst
  59. GRB 171010B: Swift ToO observations
  60. GRB 171010A: optical observations
  61. GRB 171010A: Swift ToO observations
  62. GRB 171007A: Swift detection of a burst
  63. GRB 171004A: Swift detection of a burst
  64. LIGO/Virgo G299232: LOFAR follow-up
  65. GRB 171003A: Swift detection of a burst or a Galactic Transient
  66. GRB 171001A: Swift detection of a burst
  67. 3.6m Devasthal Optical Telescope observations of GRB 170428A
  68. LIGO/Virgo G298048: Summary of Pi of the Sky observations
  69. IceCube-170922A: HAWC follow-up
  70. Search for counterpart to IceCube-170922A with ANTARES
  71. GRB 170921B: AstroSat CZTI detection
  72. LIGO/Virgo G298048: Effelsberg 100-m Radio Telescope observations of SSS17a
  73. INTEGRAL SPI-ACS observation of AMON IceCube-170922A
  74. IceCube-170922A - IceCube observation of a high-energy neutrino candidate event
  75. GRB 170921B: Fermi GBM detection
  76. GRB 170921A: Swift detection of a burst
  77. LIGO/Virgo G297595: PIRATE observations
  78. LIGO/Virgo G299232: Khureltogot observations
  79. GRB 170912B: Swift detection of a burst
  80. GRB 170912A: Swift detection of a burst
  81. LIGO/Virgo G298048 GRAWITA: VST-ESO PARANAL follow up of SSS17a in NGC4993.
  82. GRB 170906B: Swift detection of a burst
  83. GRB 170906A: Swift detection of a burst with an optical afterglow
  84. LIGO/Virgo G298389: Fermi GBM Flux Upper Limits
  85. LIGO/Virgo G299232: LOFAR follow-up
  86. Swift Triggers on MAXI J1535-571
  87. GRB 170902A: Swift detection of a burst or possible Galactic transient
  88. LIGO/Virgo G298936: PIRATE observations
  89. LIGO/Virgo G299232 ANTARES search (2)
  90. LIGO/Virgo G298048: Discovery of X-ray emission from SSS17a in NGC4993
  91. LIGO/Virgo G298048: OVRO 40m telescope follow-up
  92. LIGO/Virgo G298936: Updated localization from parameter estimation on LIGO and Virgo data
  93. LIGO/Virgo G296853: PIRATE observations
  94. LIGO/Virgo G298048: ALMA observations
  95. LIGO/Virgo G298048: Zadko Telescope 7 day observations of the OT candidate SSS17a/DLT17ck
  96. LIGO/Virgo G298936: HAWC follow-up
  97. LIGO/Virgo G299232 TZAC/TAROT observations
  98. GROND observations of GRB170827A
  99. GRB 170827A: ePESSTO NTT afterglow candidate
  100. LIGO/Virgo G299232: Transient near NGC 1343 has a somewhat blue r-i color

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