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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"
  1. XRF 020427: Sudden Ionospheric Disturbance (SID)
  2. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  3. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  4. IPN triangulation of a burst from SGR1806-20
  5. GRB/XRF 020427, Radio Observations
  6. HST detection of the likely host galaxy of GRB 020124
  7. GRB020405 field photometry at ESO
  8. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  9. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  10. GRB020321 : Optical observations.
  11. GRB020427 BeppoSAX NFI Observation
  12. XRF 020427
  13. GRB020331: Third Epoch and Revised Second Epoch Optical
  14. The end of BSAX GRB activities
  15. GRB 020410, Radio Observations
  16. GRB 020418: Optical observations
  17. GRB 020124: Optical observations
  18. GRB 020418: Optical observations
  19. IPN triangulation of GRB020418
  20. GRB020405: VLT observations of the OT environment
  21. GRB020410: BeppoSAX NFI observations refined analysis
  22. GRB 020409: Optical Observations
  23. Mars Odyssey joins the IPN
  24. IPN triangulation of GRB020413
  25. GRB 020409, 2-nd epoch optical observations at Terskol.
  26. GRB020405: predicted break
  27. GRB 020409: Optical observations
  28. GRB 020409, No Optical Detection to R = 22
  29. GRB020410: second BeppoSAX NFI observation
  30. GRB 020409: No Evidence for an Optical Afterglow
  31. GRB 020409, 2nd epoch optical observations
  32. GRB 020331 Kyoto observation on March 31
  33. GRB 020409
  34. GRB 020409 SARA Observations
  35. GRB "020411"
  36. GRB 020409, No Optical Detection to R = 20
  37. GRB020410: BeppoSAX NFI observation
  38. GRB 020409: Optical observations
  39. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  40. GRB 020410, optical observations
  41. BeppoSAX ALERT: possible GRB020411
  42. GRB 020409, optical observations
  43. GRB 020409: Optical Observations
  44. GRB020406(?), optical observations
  45. GRB020410, optical observations
  46. BeppoSAX ALERT: possible GRB020410
  47. X-ray afterglow of GRB020321
  48. BeppoSAX GRB : GRB020409
  49. GRB020331: Confirmation of Afterglow Candidate with Magellan
  50. GRB020405: VLT optical observations and V band decay slope
  51. GRB020331 optical observations with RIMOTS
  52. GRB020124 optical observations with RIBOTS/RIMOTS
  53. GRB 020321: Candidate X-ray Counterparts
  54. ASM GRB candidate 020406 refined error box
  55. GRB 020405: Moderate-resolution spectroscopy
  56. GRB020331: Optical Observations of Afterglow Candidate
  57. GRB020406(?), optical observations
  58. GRB020405: VLT optical observations
  59. Revised Photometry of the Optical Afterglow of GRB 020405
  60. GRB020405: OT observations
  61. GRB 020331: Candidate Optical Afterglow
  62. GRB 020405: Decay index
  63. Short RXTE/ASM transient 020406; may be a GRB
  64. GRB020405, Radio Observations
  65. GRB020405: VLT spectroscopy
  66. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  67. V band observations of GRB020405
  68. GRB 020405, U-band observations
  69. GRB 020405: Optical afterglow candidate
  70. IPN localization of GRB020405
  71. GRB011212: Optical Observations
  72. GRB 020331: NIR Observations
  73. GRB 020331: NIR Observations
  74. GRB020331 NIR observation at KPNO (re-submission)
  75. GRB02033 NIR observation at KPNO
  76. GRB020331 field photometry
  77. GRB 020331 Optical Observations
  78. GRB 020331, NIR observations
  79. GRB 020331: Optical observations
  80. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  81. GRB 020321: Infrared observations
  82. GRB 020322: BeppoSAX observations of the X-ray afterglow
  83. SN 2002ap - peak brightness date (SN/GRB?)
  84. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  85. GRB 020322, Radio observations
  86. Near-Infrared Observations of GRB020322 at TIRGO
  87. GRB 020321, Radio Observations
  88. GRB 020322: Optical Observations
  89. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  90. GRB 020321: Optical observations
  91. GRB020317 BVRI field photometry
  92. GRB011211 revised BVRI field photometry
  93. GRB020305 BVRI field photometry
  94. GRB020322 BVRI field photometry
  95. GRB 020322 optical observations
  96. GRB020322: Candidate Optical Afterglow
  97. GRB 020322 optical observation
  98. GRB020317 : Near IR Observations from Mt Abu Observatory
  99. GRB 020322: Optical Sources and Improved Astrometry
  100. GRB020322, optical observations

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