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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"

43901 results found.

  1. LIGO/Virgo G268556: ATLAS imaging of the skymap
  2. LIGO/Virgo G268556: DESGW/DECam observations
  3. LIGO/Virgo G268556: AGILE MCAL and Super-AGILE Observations
  4. LIGO/Virgo G268556: Fermi-LAT search for high-energy gamma-ray counterpart
  5. LIGO/Virgo G211117 / GW151226: LOFAR follow-up
  6. LIGO/Virgo G268556: Swift-XRT sources
  7. LIGO/Virgo G268556: ANTARES search
  8. LIGO/Virgo G268556: observation regions by Project Mini-GWAC of SVOM
  9. GRB 170102A: Astrosat CZTI detection
  10. GRB170104.78 MASTER-Net OT detection
  11. LIGO/Virgo G268556: INTEGRAL search of temporally coincident prompt hard X-ray emission
  12. LIGO/Virgo G268556: Fermi GBM Observations
  13. LIGO/Virgo G268556: Identification of a GW CBC Candidate
  14. GRB 170102A: POLAR observation
  15. Konus-Wind observation of GRB 170101A
  16. GRB 170101B: POLAR observation
  17. GRB 170101B: Lomonosov BDRG gamma ray discovery
  18. GRB 170101A: Lomonosov BDRG gamma ray discovery
  19. Swift trigger 729600 is not an astrophysical event
  20. GRB 161228C: POLAR observation
  21. GRS 1716-249/GRO J1719-24/V2293 Oph, Swift-BAT refined analysis
  22. GRB 170101A: POLAR observation
  23. GRB 161229A: POLAR observation
  24. GRB 170101A: Swift-BAT refined analysis
  25. Trigger 729410: Swift detection of V2293 Oph
  26. GRB 170101B: Astrosat CZTI detection
  27. GRB 170101B: Fermi GBM detection
  28. GRB 170101A: Swift detection of a burst
  29. GRB 161228B: POLAR Observation
  30. GRB 161228A: POLAR Observation
  31. GRB161219B - Anticipated hyperluminal evidence
  32. GRB 161214B: MASTER-Kislovodsk early optical observations
  33. GMRT radio detection of GRB 161219B
  34. GRB 161214A: MASTER-IAC early optical observations
  35. GRB 161219B: Spectroscopic detection of the associated SN with OSIRIS/GTC
  36. Fermi GBM trigger 504490076/161227005 is not a GRB
  37. GRB 161224A: TSHAO optical observations
  38. GRB 161224A: Swift/UVOT Upper limits
  39. GRB 161224A: Swift-XRT refined Analysis
  40. GRB 161224A: Swift-BAT refined analysis
  41. Trigger 728094, Swift-BAT refined analysis
  42. Swift Trigger 728268: a possible GRB
  43. Fermi GBM trigger 504233075/161224301 is not a GRB
  44. Swift Trigger 728094: a possible GRB
  45. GRB 161219B: UKIRT near-IR afterglow detection
  46. GRB 161219B: POLAR Observation
  47. GRB161219.78 MASTER-Net OT detection
  48. Fermi GBM trigger 504061556/161222046 is not a GRB
  49. GRB 161219B: Rapid ALMA Observations & Detection
  50. Fermi GBM trigger 504043585/161221838 is not a GRB
  51. GRB 161220A: Swift-BAT refined analysis
  52. GRB 161218B: Astrosat CZTI detection
  53. Konus-Wind observation of GRB 161219B
  54. GRB 161219B: SALT observations
  55. GRB 161219B: VLT/X-shooter redshift
  56. Fermi GBM trigger 503982114/161221126 is not a GRB
  57. GRB 161214B: optical spectroscopy of the foreground SDSS object
  58. GRB 161202A: 15 GHz upper limits from AMI
  59. GRB 161129A: 15 GHz upper limits from AMI
  60. GRB 161220A: Swift-XRT refined Analysis
  61. GRB 161220A: LCO-FTS observations
  62. GRB 161219B: MITSuME Akeno Optical Observation
  63. GRB 161219B: VLA Detection
  64. GRB 161220A: GROND Upper Limits
  65. GRB 161217C: POLAR observation
  66. GRB 161217B: POLAR Observation
  67. GRB 161219B: ISON/Terskol optical observations
  68. GRB 161219B: Swift-BAT refined analysis
  69. GRB 161219B: Swift/UVOT Detection
  70. GRB 161219B: Watcher optical observations
  71. Konus-Wind observation of GRB 161218B
  72. IPN Triangulation of GRB 161218B (long/very bright)
  73. GRB 161220A: Swift detection of a burst
  74. GRB 161212A: POLAR Detection
  75. GRB 161219B: LCO Sutherland observations
  76. GRB 161219B: GROND afterglow observations
  77. GRB 161219B: Swift-XRT refined Analysis
  78. GRB 161219B: Enhanced Swift-XRT position
  79. GRB 161219B: Swift detection of a burst with an optical afterglow
  80. GRB 161219A: a long GRB detected by INTEGRAL
  81. GRB 161218A: CALET Gamma-Ray Burst Monitor detection
  82. GRB 161218A: Swift-BAT refined analysis
  83. Konus-Wind observation of GRB 161218A
  84. Swift Trigger 727422 is not an astrophysical event.
  85. GRB 161218A: TAROT Calern observatory optical observations
  86. GRB 161217A: TAROT Calern observatory optical observations
  87. GRB 161218B: POLAR observation
  88. GRB 161218A: POLAR observation
  89. GRB 161218B: Fermi GBM detection
  90. GRB 161217A: Swift-BAT refined analysis
  91. GRB 161218A: Swift detection of a burst
  92. GRB 161217A: Swift-XRT refined Analysis
  93. GRB 161214B: AbAO and ISON/Terskol optical observations
  94. GRB 161217A: Enhanced Swift-XRT position
  95. GRB 161207A: POLAR observation
  96. GRB 161217A: Swift detection of a burst
  97. GRB 161214B: Mondy optical observations
  98. GRB 161213A: POLAR Observation
  99. GRB 161207B: POLAR observation
  100. GRB 161205A: POLAR observation

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