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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"

3771 results found.

  1. GRB 160228A: MASTER-Amur prompt observations
  2. GRB 160227A: AROMA-N Optical Observation
  3. GRB 160228A: optical observations
  4. GRB 160225.81/FERMI Trigg 478121069: MASTER OT J095503.19-355149.4 detection
  5. GRB 160221A: Swift-XRT afterglow detection
  6. GRB 160221A: Swift-XRT observations
  7. GRB 160221A: MASTER-SAAO early observations
  8. GRB 160220A: MASTER-Amur observations
  9. LIGO/Virgo G211117: LOFAR follow-up
  10. GRB 160206A: MAXI/GSC detection
  11. GRB 160203A: TAROT La Silla - TAROT Calern - Zadko observations
  12. Fermi GBM trigger 475675010/160128498 is not a GRB
  13. GRB 160131A: Khureltogot optical observations
  14. GRB 160127A: LCOGT-Sutherland optical upper limit
  15. LIGO Virgo G211117: MWA Observations
  16. GRB160119A: BOOTES-2/TELMA Early Upper Limits
  17. GRB 160119A: Swift detection of a burst
  18. GRB 151228B: AbAO optical upper limit
  19. Konus-Wind observation of GRB 160113A
  20. IPN Triangulation of GRB 160113A
  21. LIGO/Virgo G211117: iPTF Observations of PS15dpn
  22. LIGO/Virgo G211117: VISTA imaging
  23. LIGO/Virgo G211117: Subaru Hyper Suprime-Cam follow-up observation
  24. GRB 160104A: MITSuME Okayama upper limits
  25. LIGO/Virgo G211117: Summary of Pan-STARRS transients
  26. LIGO/Virgo G211117: Gemini classification of 7 Pan-STARRS transients
  27. LIGO/Virgo G211117: LOFAR follow-up
  28. LIGO/Virgo G211117: PESSTO classification of Pan-STARRS transients
  29. LIGO/Virgo G211117: CSS/CRTS observations on 29/30 Dec 2015 UT
  30. GRB 160102A: MAXI/GSC detection
  31. LIGO/Virgo G211117: La Silla - QUEST observations 2015 Dec 28 - 30
  32. GRB 151231B: Fermi GBM observation
  33. LIGO/Virgo G211117: 44 transients from Pan-STARRS data during 2015-12-28/30
  34. LIGO/Virgo G211117: Liverpool Telescope followup of EM candidates
  35. LIGO/Virgo G211117: VLA follow-up
  36. Trigger 668877: Swift detection of V 404 Cyg
  37. LIGO/Virgo G211117: MAGIC very-high energy gamma-ray observations
  38. V404Cyg Swift Trigger 668097: CrAO RT-22 radio observations
  39. V404Cyg Swift Trigger 668097: AbAO optical observations
  40. LIGO/Virgo G211117: Optical Observations with Kiso Schmidt telescope and KWFC
  41. LIGO/Virgo G211117: List of near-term future observation regions by Project Mini-GWAC of SVOM
  42. LIGO/Virgo G211117: iPTF Optical Transient Candidates
  43. LIGO/Virgo G211117: La Silla - QUEST observations 2015 Dec 28, 29
  44. GRB 151228B: Fermi GBM observation
  45. GRB 151228A: MITSuME Akeno optical upper limits
  46. GRB 151228A: T60 observations
  47. LIGO/Virgo G211117: Optical NIR observation with Kanata telescope
  48. GRB 151228A: Fermi GBM observation
  49. LIGO/Virgo G211117: Pan-STARRS1 observations 2015-12-28
  50. LIGO/Virgo G211117: INAF VST-ESO PARANAL observations
  51. GRB 151215A: Swift detection of a burst
  52. GRB 151205C: Optical follow-up observations at Kiso
  53. GRB 130831A: MASTER early OT detection and LC
  54. GRB 151205B: MASTER-NET early optical observations
  55. GRB 151205B: Swift detection of a burst
  56. Fermi GBM trigger 470375959/151128166 is not a GRB
  57. GRB151127A: Planned XMM-Newton observation
  58. GRB 151120A: Swift-XRT afterglow detection
  59. GRB 151120A: GROND optical/NIR afterglow
  60. GRB 151118A: ISON-NM early optical limit
  61. Swift-BAT trigger 663164 is not a burst.
  62. GRB 151107B: MASTER-NET OT detection inside the FERMI error box
  63. LIGO/Virgo G194575: Liverpool Telescope observations of iPTF-15dld and iPTF-15dni
  64. GRB 151107A: MASTER-NET optical observations
  65. GRB 151027A: Mondy optical observations
  66. GRB 151027A: Mt. Terskol observatory optical observation
  67. LIGO/Virgo G194575: LT Spectroscopy of iPTF candidates
  68. GRB 151031A: Swift detection of a burst
  69. GRB 151027A: Continued P60 Monitoring
  70. GRB 151027A: Optical counterpart detection
  71. GRB 151027A: SAO RAS optical observations
  72. GRB 151027B: LCOGT FTN afterglow observations
  73. GRB 151027A : Xinglong TNT optical observation
  74. GRB 151027A: continued GMG observation
  75. GRB 151027A: LCOGT-McDonald afterglow observations
  76. GRB 151027B: GROND Optical/NIR Afterglow Detection
  77. GRB 151027B: VLT/X-shooter redshift
  78. LIGO/Virgo G194575: Kanata/J-GEM optical follow-up
  79. LIGO/Virgo G194575: CQUEAN/LOAO observations
  80. LIGO/Virgo G194575: more details on transients from Pan-STARRS in the RA=1hr localisation region
  81. LIGO/Virgo G194575: transients from Pan-STARRS in the RA=1hr localisation region
  82. Konus-Wind observation of GRB 151021A
  83. GRB 151001B: Swift-BAT refined analysis
  84. GRB 150925A: Swift detection of a burst
  85. LIGO/Virgo G184098: INTEGRAL search of temporally coincident prompt hard X-ray emission
  86. LIGO/Virgo G184098: DESGW followup program
  87. LIGO/Virgo G184098: Keck II DEIMOS Spectra of iPTF Optical Candidates
  88. GRB 150915A: GROND detection of an optical counterpart candidate
  89. Fermi GBM trigger 463890496/150914103 is not a GRB
  90. GRB 150910A: VLA Detection
  91. GRB 150910A: MITSuME Okayama Ks-band Observation
  92. GRB 150910A: Enhanced Swift-XRT position
  93. GRB 150910A: Swift/UVOT Detection of a Brightening Afterglow
  94. GRB 150910A: LCOGT FTN afterglow observations
  95. GRB 150910A: Swift detection of a burst with an optical afterglow
  96. GRB 150907B: MASTER-SAAO early optical observations
  97. GRB 150907A: MAXI/GSC detection
  98. GRB 150901A: Swift detection of a burst
  99. Fermi GBM trigger 150828520 is not a GRB
  100. Swift Trigger 652824 is due to noise

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