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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"

8520 results found.

  1. GRB 170115B: AGILE/SuperAGILE localisation
  2. LIGO/Virgo G270580: No change to estimate of LIGO false alarm probability
  3. LIGO/Virgo G270580: Liverpool Telescope classification of EM candidates
  4. LIGO/Virgo G270580: Pan-STARRS coverage and 124 optical transients
  5. LIGO/Virgo G268556: ANTARES upper limits
  6. GRB 170121B: AbAO optical observations
  7. GRB 170121B: Swift-XRT and UVOT observations
  8. GRB 170121B: Swift ToO observations
  9. LIGO/Virgo G270580: Fermi-LAT search for a high-energy gamma-ray counterpart
  10. LIGO/Virgo G270580: INTEGRAL search of temporally coincident prompt hard X-ray
  11. LIGO/Virgo G268556: Global MASTER Net 21 OTs detection
  12. LIGO/Virgo G270580 ANTARES search
  13. LIGO/Virgo G270580: Identification of a GW Burst Candidate
  14. GRB 170117A: Swift ToO observations
  15. GRB 170115B: Tiled Swift observations
  16. GRB 170115A: Swift detection of a burst
  17. GRB 170113A: Swift detection of a burst with an optical counterpart
  18. LIGO/Virgo G268556: TZAC TAROT network observations with TRE/TCA/TCH
  19. GRB 170112A: REM optical/NIR observations
  20. LIGO/Virgo G268556: Gemini spectra of Pan-STARRS1 transients
  21. GRB 170112A: Swift detection of a short burst
  22. LIGO/Virgo G268556: Additional GROWTH follow up observation of iPTF Optical Transient Candidates
  23. LIGO/Virgo G268556/GW170104: Campo Imperatore Observatory observations
  24. GRB 170111A: Swift detection of a burst
  25. LIGO/Virgo G268556: Liverpool Telescope Spectroscopy of iPTF candidates
  26. LIGO/Virgo G268556: Pan-STARRS1 observations and summary of transient sources
  27. LIGO/Virgo G268556/GW170104: Lomonosov BDRG observations
  28. LIGO/Virgo G268556: iPTF Optical Transient Candidates
  29. Swift Trigger 730874 is not astrophysical
  30. LIGO/Virgo G268556/GW170104: Asiago Observations
  31. LIGO/Virgo G268556: Updated sky map from gravitational-wave data
  32. Swift Trigger 730513 is not an astrophysical event
  33. LIGO/Virgo G268556: ANTARES search
  34. LIGO/Virgo G268556: Fermi GBM Observations
  35. LIGO/Virgo G268556: Identification of a GW CBC Candidate
  36. Konus-Wind observation of GRB 170101A
  37. GRB 170101A: Swift-BAT refined analysis
  38. GRB161219B - Anticipated hyperluminal evidence
  39. GRB 161219B: Spectroscopic detection of the associated SN with OSIRIS/GTC
  40. GRB 161220A: Swift detection of a burst
  41. GRB 161219B: Swift detection of a burst with an optical afterglow
  42. GRB 161218A: CALET Gamma-Ray Burst Monitor detection
  43. GRB 161218A: Swift-BAT refined analysis
  44. Swift Trigger 727422 is not an astrophysical event.
  45. GRB 161217A: Swift detection of a burst
  46. IceCube-161210: Konus-Wind upper limits
  47. IceCube-161210: CALET Gamma-Ray Burst Monitor upper limits
  48. GRB 161214A: fading optical afterglow candidate with the LT
  49. HAWC follow-up on IceCube-161210
  50. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161210
  51. IceCube-161210: IceCube observation of a high-energy neutrino candidate event
  52. GRB 161129A: NOT optical observations and candidate host galaxy
  53. GRB 161202A: Swift detection of a burst
  54. GRB 161129A: Swift detection of a burst
  55. GRB 161123A: Tiled Swift observations
  56. Swift Trigger 723124 is probably not a GRB
  57. Swift Trigger 722681 is probably not a GRB
  58. GRB 161117B: Swift detection of a burst
  59. GRB 161117A: Swift detection of a burst with an optical counterpart
  60. GRB 161113A: Swift detection of a burst
  61. IceCube-161103: CALET Gamma-Ray Burst Monitor upper limits
  62. GRB 161106A: CALET Gamma-Ray Burst Monitor detection
  63. GRB 161109A: Tiled Swift observations
  64. GRB 161108A: TAROT Calern observatory optical observations
  65. GRB 161105A: TAROT La Silla observatory optical observations
  66. GRB 161108A: RATIR Afterglow Confirmation
  67. GRB 161108A: NOT candidate afterglow
  68. GRB 161108A: Swift detection of a burst
  69. GRB 161103A: an ultra-long GRB detected by Konus-Wind
  70. IceCube-161103: Konus-Wind upper limits
  71. GRB 161104A: Gemini South optical observations
  72. Search for counterpart to IceCube-161103A with ANTARES
  73. GRB 161105A: Swift detection of a burst
  74. GRB 161104A: Swift detection of a short burst
  75. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161103
  76. HAWC follow up of IceCube-161103
  77. IceCube-161103: IceCube observation of a very-high-energy neutrino
  78. GRB 161023A: Zadko observatory - Gingin optical observations
  79. GRB 161023A: Swift ToO observations
  80. Swift Trigger 718919 is not an astrophysical event.
  81. GRB 161022A: Fermi GBM observation
  82. GRB 161015A: further Swift-XRT follow-up observations
  83. GRB 161017A: Swift detection of a burst with a bright optical afterglow
  84. GRB 161015A: Tiled Swift observations
  85. GRB161014A: optical afterglow candidate with the LCOGT-FTS
  86. GRB 161014A: MITSuME-Akeno optical observation
  87. GRB 161011A: TSHAO afterglow candidate
  88. GRB 161011A: Swift detection of a burst
  89. GRB 161010A: Swift ToO observations
  90. GRB 161007A: AbAO optical observations
  91. GRB 161007A: Swift detection of a burst
  92. GRB 150302A: late-time imaging and optical afterglow confirmation
  93. GRB 161004B: Swift detection of a burst
  94. GRB 161004A: TSHAO optical observations
  95. GRB 161004A: Swift detection of a burst with a possible optical counterpart
  96. GRB 161001A: MASTER-OAFA and MASTER-SAAO early optical observations
  97. GRB 161001A: GROND afterglow candidate
  98. GRB 161001A: X-shooter spectroscopy, candidate host galaxy and redshift
  99. GRB 161001A: Swift detection of a burst
  100. GRB 160927A: RTT150 optical afterglow candidate

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