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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"

3059 results found.

  1. GRB 171211A: Swift-BAT refined analysis
  2. Swift Trigger 796115 is probably not a GRB
  3. GRB 171205A: GOTO detection of the optical counterpart
  4. GRB 171120A: Swift-BAT refined analysis
  5. GRB 171112A: MAXI/GSC detection
  6. GRB 171010A: afterglow and SN 2017htp optical observations
  7. GRB 171030A: MASTER inspection of the IPN error box of the short GRB.
  8. GRB 171027A, Swift-BAT refined analysis
  9. GRB 171027A: MASTER-OAFA (Argentina) early prompt optical observations
  10. GRB 171013A: Swift detection of a possible burst
  11. GRB 171007A: Fermi GBM observation
  12. GRB 171007A: Swift detection of a burst
  13. 3.6m Devasthal Optical Telescope observations of GRB 170428A
  14. LIGO/Virgo G297595: NIR Observations following GW170814
  15. LIGO/Virgo G298048: AST3-2 observations of SSS17a/DLT17ck from Antarctica
  16. GRB 170912B: Swift/UVOT Upper Limits
  17. LIGO/Virgo G297595: Las Cumbres Observatory Optical Follow-Up
  18. GRB 170906A: Swift-BAT refined analysis
  19. GRB 170906C: Swift-BAT refined analysis
  20. GRB 170906B: Swift detection of a burst
  21. LIGO/VIRGO G298048: Radio detection of SSS17a at 6 GHz with the VLA
  22. LIGO/Virgo G297595: DECam observations of BBH merger region of interest
  23. LIGO/Virgo G299232: GRAWITA Campo Imperatore optical observations
  24. LIGO/Virgo G298048: OVRO 40m telescope follow-up
  25. LIGO/Virgo G298048: Zadko Telescope 7 day observations of the OT candidate SSS17a/DLT17ck
  26. IPN Triangulation of GRB 170826A (short)
  27. LIGO/Virgo G299232: Optical Transient Discovery by Swift/UVOT
  28. LIGO/Virgo G299232: Transient near NGC 1343 has a somewhat blue r-i color
  29. LIGO/Virgo G298936: CALET Observations
  30. LIGO/Virgo G298936 TAROT/TZAC observations
  31. LIGO/Virgo G298048: MASTER Global-Net early optical observations and the Possible KiloNova SSS17a in NGC 4993 photometry and merging rate
  32. LIGO/Virgo G298048: HAWC follow-up
  33. Konus-Wind observation of GRB 170822A
  34. LIGO/Virgo G298048: Results of the ASKAP search for fast radio bursts
  35. LIGO/Virgo G298936: IceCube neutrino observations
  36. LIGO/Virgo G298048: TOROS optical counterpart search
  37. LIGO/Virgo G298048: Further VLA Observations
  38. LIGO/Virgo G298048: HSC observations of the OT candidate of G298048
  39. LIGO/Virgo G298048: ASKAP search for fast radio bursts
  40. LIGO/Virgo G298048: TZAC TAROT Reunion (TRE) observations
  41. LIGO/Virgo G298048: REM optical/NIR observations
  42. LIGO/Virgo G298048: IPN triangulation of Fermi/GBM trigger 524666471/170817529
  43. LIGO/Virgo G297595: Subaru Hyper Suprime-Cam follow-up observations
  44. LIGO/Virgo G297595: REM optical/NIR observations
  45. LIGO/Virgo G297595: Fermi GBM Observations
  46. GRB 170808A: MAXI/GSC detection
  47. GRB 170803A: Swift-BAT refined analysis
  48. GRB 170728B, Swift-BAT refined analysis
  49. GRB 170728A: Swift-BAT refined analysis
  50. Swift triggers on a new galactic source: Swift J181723.1-164300
  51. GRB 170714A, Swift-BAT refined analysis
  52. GRB 170705A: MASTER-OAFA early OT observations
  53. GRB 170626B CALET Gamma-Ray Burst Monitor detection
  54. GRB 170626A: SAO RAS confirmation of OT fading
  55. GRB 170626A: Swift-BAT refined analysis
  56. GRB 170626A: SAO RAS possible OT detection
  57. GRB 170626B: The first GRB detected by the Insight-HXMT X-ray Telescope (revised)
  58. GRB170612.87 MASTER-Net OT detection
  59. GRB 170607A: Swift-BAT refined analysis
  60. LIGO/Virgo G288732:SVOM/Mini-GWAC observations of the initial skymap
  61. GRB 170531A: Swift detection of a burst
  62. GRB 170519A: CrAO optical observations
  63. Konus-Wind observation of GRB 170527A
  64. GRB 170519A: ISON/Multa optical observations
  65. LIGO/Virgo G268556: optical observations and classification of Pan-STARRS1 transients
  66. GRB 170524A: Swift-BAT refined analysis
  67. LIGO/Virgo G277583: UH88/SNIFS classification of ATLAS and PS1 transients
  68. GRB 170516A: Swift-BAT refined analysis
  69. GRB 170428A: GROND detection of the afterglow
  70. GRB 170424A: Fermi-LAT detection
  71. GRB 170403B CALET Gamma-Ray Burst Monitor detection
  72. GRB 170331A: Swift-BAT refined analysis
  73. DOAO 1m telescope V, R, I observation of GRB 170317A
  74. IPN Triangulation of GRB 170320A (long/intense)
  75. Search for counterpart to IceCube-170321A with ANTARES
  76. GRB 170317A: Mondy optical observations
  77. GRB 170318B: Prompt enhanced Swift-XRT position
  78. GRB 170315A: POLAR observation
  79. GRB 170317A: Swift-BAT refined analysis
  80. LIGO/Virgo G277583: ERRATUM LV GCN 20871: TAROT Calern (TCA) observations
  81. LIGO/Virgo G277583: TAROT Calern (TCA) observations
  82. LIGO/Virgo G277583: SVOM/Mini-GWAC observations of the initial skymap
  83. LIGO/Virgo G270580: optical observations and classification of PS and MASTER sources
  84. LIGO/Virgo G275404 and AGL J1914+1043: INTEGRAL follow-up
  85. LIGO/Virgo G275697: MAXI/GSC observations
  86. LIGO/Virgo G275697: MASTER automatic follow up detection
  87. LIGO/Virgo G275404: Nearby galaxy observations by J-GEM collaboration
  88. LIGO/Virgo G275697: Fermi-LAT search for a high-energy gamma-ray counterpart
  89. LIGO/Virgo G275697: Konus-Wind observations
  90. LIGO/Virgo G275697: Swift-XRT sources
  91. LIGO/Virgo G275697: Swift/BAT data search
  92. LIGO/Virgo G275697: AGILE-GRID preliminary analysis
  93. LIGO/Virgo G275697: AGILE MCAL Observations
  94. LIGO/Virgo G275697: INTEGRAL search for a prompt gamma-ray counterpart
  95. LIGO/Virgo G275697: Identification of a GW CBC Candidate
  96. LIGO/Virgo G275404: INTEGRAL search for a prompt gamma-ray counterpart
  97. LIGO/Virgo G275404: SVOM/Mini-GWAC: Observations of initial skymap
  98. LIGO/Virgo G275404: MASTER automatic follow up observations
  99. LIGO/Virgo G274296: J-GEM optical/NIR follow-up observations
  100. LIGO/Virgo G274296: Asiago 1.82m Optical Observations

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