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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"

3037 results found.

  1. Konus-Wind observation of GRB 170527A
  2. LIGO/Virgo G268556: optical observations and classification of Pan-STARRS1 transients
  3. GRB 170522A: Global MASTER-Net job
  4. IPN Triangulation of GRB 170522B (long/intense)
  5. LIGO/Virgo G277583: UH88/SNIFS classification of ATLAS and PS1 transients
  6. LIGO/Virgo G284239: TZAC TAROT network observations with TRE/TCA/TCH
  7. GRB 170423A: Fermi GBM detection
  8. Swift Trigger 748858: MASTER-OAFA early optical observations
  9. IPN Triangulation of GRB 170403A (short)
  10. DOAO 1m telescope V, R, I observation of GRB 170317A
  11. GRB 170317A: Swift detection of a burst with an optical counterpart
  12. LIGO/Virgo G277583: ERRATUM LV GCN 20871: TAROT Calern (TCA) observations
  13. LIGO/Virgo G277583: TAROT Calern (TCA) observations
  14. LIGO/Virgo G277583: SVOM/Mini-GWAC observations of the initial skymap
  15. LIGO/Virgo G270580: optical observations and classification of PS and MASTER sources
  16. IPN Triangulation of GRB 170305A (short)
  17. LIGO/Virgo G275697: Further Swift-XRT sources
  18. LIGO/Virgo G275697: SVOM/Mini-GWAC observations of the initial skymap
  19. LIGO/Virgo G275697: iPTF Optical Transient Candidates
  20. LIGO/Virgo G275404: iPTF Optical Transient Candidates
  21. LIGO/Virgo G275404: CNEOST optical observations
  22. GRB 170220A: POLAR Observation
  23. LIGO/Virgo G274296: J-GEM optical/NIR follow-up observations
  24. LIGO/Virgo G274296: Asiago 1.82m Optical Observations
  25. LIGO/Virgo G274296: PESSTO classification of 9 Pan-STARRS transients
  26. Konus-Wind observation of GRB 170219A (short/hard)
  27. LIGO/Virgo G274296: Pan-STARRS imaging and discovery of 70 transients
  28. GRB 170210A: POLAR observation
  29. IPN Triangulation of GRB 170210A
  30. GRB 170210A: Fermi GBM observation
  31. Konus-Wind observation of GRB 170209A
  32. GRB 170208A: Swift-BAT refined analysis
  33. GRB 170202A: SQUEAN Observation
  34. LIGO/Virgo G270580: Las Cumbres Observatory Follow-up Observations
  35. GRB 170115B: AGILE/SuperAGILE localisation
  36. LIGO/Virgo G270580: Liverpool Telescope classification of EM candidates
  37. LIGO/Virgo G270580: Pan-STARRS coverage and 124 optical transients
  38. GRB 170121B: MASTER early optical observations of the Swift possible XT
  39. LIGO/Virgo G268556/GW170104: MAXI/GSC observations
  40. GRB 170121B/Fermi trigger 506702667 MASTER-Amur OT detection
  41. LIGO/Virgo G270580: Observations of initial skymap by Project Mini-GWAC of SVOM
  42. GRB 170112A : AbAO optical observations
  43. GRB 170113A: Fermi GBM observations
  44. GRB 170112A: MASTER-OAFA (Argentina) early optical observations
  45. LIGO/Virgo G268556: Pan-STARRS1 observations and summary of transient sources
  46. LIGO/Virgo G268556/GW170104: Lomonosov BDRG observations
  47. LIGO/Virgo G268556: Continued iPTF Observations and Additional Optical Transient Candidates
  48. LIGO/Virgo G268556: SWASP optical imaging
  49. LIGO/Virgo G211117 / GW151226: LOFAR follow-up
  50. LIGO/Virgo G268556: Swift-XRT sources
  51. GRB 170101B: POLAR observation
  52. GRB 170101B: Lomonosov BDRG gamma ray discovery
  53. GRB 170101B: Astrosat CZTI detection
  54. GRB 170101B: Fermi GBM detection
  55. GRB 161214A: MASTER-IAC early optical observations
  56. GRB161219.78 MASTER-Net OT detection
  57. GRB 161219B: Rapid ALMA Observations & Detection
  58. GRB 161220A: Swift-XRT refined Analysis
  59. GRB 161219B: VLA Detection
  60. GRB 161219B: Swift/UVOT Detection
  61. GRB 161219B: LCO Sutherland observations
  62. GRB 161219B: Enhanced Swift-XRT position
  63. GRB 161219B: Swift detection of a burst with an optical afterglow
  64. GRB 161218A: CALET Gamma-Ray Burst Monitor detection
  65. Konus-Wind observation of GRB 161218A
  66. GRB 161218A: POLAR observation
  67. GRB 161218A: Swift detection of a burst
  68. GRB 161129A: ISON/UAFO optical observations
  69. GRB 161117A: SMARTS optical/IR afterglow observations
  70. GRB 161119A: MASTER-SAAO possible OT detection during Fermi Alert
  71. Konus-Wind observation of GRB 161117A
  72. GRB 161108A: NOT redshift
  73. IceCube-161103: MASTER follow-up observations
  74. GRB 161023A: LCOGT-FTS optical observations
  75. GRB 161023A (Integral trigger 7613) MASTER-Net bright OT detection
  76. Swift Trigger 718766 is not an astrophysical event.
  77. GRB 161017A: Lomonosov Gamma Ray and MASTER Optical prompt observations
  78. GRB 161014A: AROMA-N Optical Observation
  79. GRB 161014A: Swift/UVOT Detection
  80. GRB 161014A : Xinglong TNT optical observation
  81. GRB 161010A: Swift/UVOT Possible Detection
  82. GRB 161010A: Swift-XRT afterglow detection
  83. GRB 160927A: 15 GHz upper limits from AMI
  84. GRB 161001A: MASTER-OAFA and MASTER-SAAO early optical observations
  85. GRB 161001A: GROND afterglow candidate
  86. GRB 161001A: X-shooter spectroscopy, candidate host galaxy and redshift
  87. GRB 161001A: Prompt enhanced Swift-XRT position
  88. GRB 160917A: Fermi GBM observation
  89. GRB 160910A: Swift-XRT afterglow detection
  90. GRB 160910A: Fermi GBM observation
  91. GRB 160905A: Swift detection of a burst with an optical counterpart
  92. Konus-Wind observation of GRB 160821A
  93. GRB 160816A: TSHAO optical observations
  94. BAT detection and localization of GRB 160819A
  95. GRB 160816A: ISON/UAFO optical observations
  96. IceCube 160806A: Lomonosov BDRG gamma ray prompt observations
  97. IPN Triangulation of GRB 160806A
  98. Swift Trigger 707545 is likely 4U 1850-03/GS1843-02
  99. Swift Trigger 707517 is probably not a GRB
  100. IPN Triangulation of GRB 160802A

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