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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"

4254 results found.

  1. Trigger 686443: Swift detection of SGR 1935+2154
  2. Fermi GBM trigger 484906918/160514349 is not a GRB
  3. FACT follow-up of the IceCube event 160427A
  4. Interplanetary Network Search for IceCube 160427A
  5. LIGO/Virgo G211117: Astrosat CZTI upper limits
  6. GRB 160506A: Swift detection of a burst
  7. MASTER search for counterpart to the IceCube event 67093193 (run 127853)
  8. GRB 160425A: SMARTS optical/IR observations
  9. GRB 160425A: Swift detection of an unusual burst with an optical afterglow
  10. LIGO/Virgo G211117: LOFAR follow-up
  11. GRB 160325A: GROND Upper Limits
  12. SGR 0755-2933, Swift-BAT refined analysis
  13. Swift detection of a likely new SGR: SGR 0755-2933
  14. LIGO/Virgo G194575: EWE for NOWT follow-up of northern sky
  15. GRB 160314A: Swift detection of a burst
  16. LIGO/Virgo G211117: GRAWITA LBT follow-up of PS15dpn
  17. GRB 160228A: GROND Afterglow Candidate
  18. GRB 160220A: MASTER-Amur observations
  19. LIGO/Virgo G184098: Correction for GCN Circular 18361
  20. LIGO/Virgo G211117: LOFAR follow-up
  21. GRB 160206B: iPTF P48 Observations and Optical Transient Candidates
  22. GRB 160131A: Mondy optcial observations
  23. GRB 160131A: MITSuME Ishigakijima Optical Observation
  24. GRB 160131A: Khureltogot optical observations
  25. GRB 160131A: Xinglong 60cm WFT optical observation
  26. GRB 160121A: TSHAO optical afterglow confirmation
  27. GRB 151228B: AbAO optical upper limit
  28. GRB 160117B: GROND optical/NIR afterglow observations
  29. LIGO/Virgo G211117: VISTA imaging
  30. LIGO/Virgo G211117: Subaru Hyper Suprime-Cam follow-up observation
  31. LIGO/Virgo G211117: Summary of Pan-STARRS transients
  32. LIGO/Virgo G211117: LOFAR follow-up
  33. LIGO/Virgo G211117: CSS/CRTS observations on 29/30 Dec 2015 UT
  34. LIGO/Virgo G211117: 44 transients from Pan-STARRS data during 2015-12-28/30
  35. LIGO/Virgo G211117: Liverpool Telescope followup of EM candidates
  36. LIGO/Virgo G211117: OAO-WFC NIR follow-up observations
  37. GRB 151229A: MITSuME Akeno optical upper limits
  38. LIGO/Virgo G211117: Optical Observations with Kiso Schmidt telescope and KWFC
  39. LIGO/Virgo G211117: List of near-term future observation regions by Project Mini-GWAC of SVOM
  40. LIGO/Virgo G211117: iPTF Optical Transient Candidates
  41. GRB 151229A: MITSuME Okayama upper limits
  42. LIGO/Virgo G211117: La Silla - QUEST observations 2015 Dec 28, 29
  43. GRB 151228B: MITSuME Akeno optical upper limits
  44. GRB 151229A: Fermi GBM observation
  45. GRB 151228B: Fermi GBM observation
  46. LIGO/Virgo G211117: Further Swift-XRT sources
  47. LIGO/Virgo G211117: Optical follow-up with Kanata telescope
  48. LIGO/Virgo G211117: INAF VST-ESO PARANAL observations
  49. IBAS Alert 7313 is SGR J1935+2154
  50. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  51. GRB 151216A: MAXI/GSC detection
  52. GRB 151205C: Optical follow-up observations at Kiso
  53. GRB 130831A: MASTER early OT detection and LC
  54. GRB 151205C: MAXI/GSC detection
  55. Fermi GBM trigger 470712580/151202062 is not a GRB
  56. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  57. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  58. GRB 151120A: Swift-XRT afterglow detection
  59. Swift-BAT trigger 663164 is not a burst.
  60. GRB 151027A: Mondy optical observations
  61. LIGO/Virgo G194575: LT Spectroscopy of iPTF candidates
  62. LIGO/Virgo G194575: INAF-TNG follow-up of iPTF15dkm and iPTF15dlj
  63. GRB 151029A: MITSuME Ishigakijima upper limits
  64. GRB 151029A: LCOGT-FTS afterglow observations
  65. LIGO/Virgo G194575: VLA follow-up
  66. GRB 151029A: GROND afterglow observations
  67. GRB 151027A: LCOGT-McDonald afterglow observations
  68. LIGO/Virgo G194575: further Pan-STARRS observations of the RA=1hr localisation region
  69. LIGO/Virgo G194575: Near-infrared follow-up with OAO-WFC
  70. LIGO/Virgo G194575: MAXI/GSC observations
  71. GRB 151021A: Swift detection of a burst
  72. Fermi GBM trigger 466316973/151012187 is not a GRB
  73. Konus-Wind observation of GRB 151001B
  74. LIGO/Virgo G184098: Further VST-ESO PARANAL observations
  75. GRB 151001B: Swift detection of a burst
  76. IPN Triangulation of GRB 150922A (short/hard)
  77. LIGO/Virgo G184098: TAROT network optical observations
  78. LIGO/Virgo G184098: Observations from the TOROS collaboration
  79. LIGO/Virgo G184098: TAROT La Silla Observatory optical observations (TZAC)
  80. GRB 150911A: WHT optical imaging
  81. GRB 150910A: MITSuME Ishigakijima Optical Observation after 1 day
  82. GRB 150910A: Swift detection of a burst with an optical afterglow
  83. GRB 150907B: MASTER-SAAO early optical observations
  84. GRB 150906A: Fermi GBM detection
  85. GRB 150902A: Swift-XRT observations
  86. GRB 150831B: MASTER-IAC early optical observations
  87. Fermi GBM trigger 150829183 is not a GRB
  88. Fermi GBM trigger 150828520 is not a GRB
  89. Konus-Wind observation of GRB 150818A
  90. IPN Triangulation of GRB 150819B (short / very intense)
  91. Fermi GBM GRB Trigger 458852670: iPTF P48 Observations
  92. GRB 150728A: TSHAO optical observations
  93. Trigger 650221: Swift detection of a IGR J00291+5934
  94. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  95. Trigger 649113: Swift detection of SGR 1E 1841-045
  96. Swift-XRT observations of GRB 150710A
  97. Fermi Gamma-ray Burst Monitor trigger bn150629779 is not a GRB
  98. GRB 150627A: Swift/UVOT Detection
  99. GRB 150627A: Swift-XRT afterglow detection
  100. V404 Cyg: MASTER Swift, Integral alert observations

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