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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"

43612 results found.

  1. GRB020321 : Optical observations.
  2. GRB020427 BeppoSAX NFI Observation
  3. XRF 020427
  4. GRB020331: Third Epoch and Revised Second Epoch Optical
  5. The end of BSAX GRB activities
  6. GRB 020410, Radio Observations
  7. GRB 020418: Optical observations
  8. GRB 020124: Optical observations
  9. GRB 020418: Optical observations
  10. IPN triangulation of GRB020418
  11. GRB020405: VLT observations of the OT environment
  12. GRB020410: BeppoSAX NFI observations refined analysis
  13. GRB 020409: Optical Observations
  14. Mars Odyssey joins the IPN
  15. IPN triangulation of GRB020413
  16. GRB 020409, 2-nd epoch optical observations at Terskol.
  17. GRB020405: predicted break
  18. GRB 020409: Optical observations
  19. GRB 020409, No Optical Detection to R = 22
  20. GRB020410: second BeppoSAX NFI observation
  21. GRB 020409: No Evidence for an Optical Afterglow
  22. GRB 020409, 2nd epoch optical observations
  23. GRB 020331 Kyoto observation on March 31
  24. GRB 020409
  25. GRB 020409 SARA Observations
  26. GRB "020411"
  27. GRB 020409, No Optical Detection to R = 20
  28. GRB020410: BeppoSAX NFI observation
  29. GRB 020409: Optical observations
  30. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  31. GRB 020410, optical observations
  32. BeppoSAX ALERT: possible GRB020411
  33. GRB 020409, optical observations
  34. GRB 020409: Optical Observations
  35. GRB020406(?), optical observations
  36. GRB020410, optical observations
  37. BeppoSAX ALERT: possible GRB020410
  38. X-ray afterglow of GRB020321
  39. BeppoSAX GRB : GRB020409
  40. GRB020331: Confirmation of Afterglow Candidate with Magellan
  41. GRB020405: VLT optical observations and V band decay slope
  42. GRB020331 optical observations with RIMOTS
  43. GRB020124 optical observations with RIBOTS/RIMOTS
  44. GRB 020321: Candidate X-ray Counterparts
  45. ASM GRB candidate 020406 refined error box
  46. GRB 020405: Moderate-resolution spectroscopy
  47. GRB020331: Optical Observations of Afterglow Candidate
  48. GRB020406(?), optical observations
  49. GRB020405: VLT optical observations
  50. Revised Photometry of the Optical Afterglow of GRB 020405
  51. GRB020405: OT observations
  52. GRB 020331: Candidate Optical Afterglow
  53. GRB 020405: Decay index
  54. Short RXTE/ASM transient 020406; may be a GRB
  55. GRB020405, Radio Observations
  56. GRB020405: VLT spectroscopy
  57. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  58. V band observations of GRB020405
  59. GRB 020405, U-band observations
  60. GRB 020405: Optical afterglow candidate
  61. IPN localization of GRB020405
  62. GRB011212: Optical Observations
  63. GRB 020331: NIR Observations
  64. GRB 020331: NIR Observations
  65. GRB020331 NIR observation at KPNO (re-submission)
  66. GRB02033 NIR observation at KPNO
  67. GRB020331 field photometry
  68. GRB 020331 Optical Observations
  69. GRB 020331, NIR observations
  70. GRB 020331: Optical observations
  71. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  72. GRB 020321: Infrared observations
  73. GRB 020322: BeppoSAX observations of the X-ray afterglow
  74. SN 2002ap - peak brightness date (SN/GRB?)
  75. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  76. Near-Infrared Observations of GRB020322 at TIRGO
  77. GRB 020321, Radio Observations
  78. GRB 020322: Optical Observations
  79. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  80. GRB 020321: Optical observations
  81. GRB020317 BVRI field photometry
  82. GRB011211 revised BVRI field photometry
  83. GRB020305 BVRI field photometry
  84. GRB020322 BVRI field photometry
  85. GRB 020322 optical observations
  86. GRB 020322 optical observation
  87. GRB020317 : Near IR Observations from Mt Abu Observatory
  88. GRB 020322: Optical Sources and Improved Astrometry
  89. GRB020322, optical observations
  90. GRB 020322: Optical candidate
  91. XMM-Newton observation of GRB020322
  92. GRB020322: Optical Observations
  93. GRB020322: BeppoSAX/NFI Observations
  94. Bepposax GRB020322 The second springtime BSAX GRB
  95. GRB 020321: Optical observations
  96. GRB 011121: Fourth Epoch of HST Imaging
  97. GRB020317: optical observations
  98. GRB020321 optical observations
  99. GRB020321: BeppoSAX/NFI Observations
  100. GRB020321: a faint BeppoSAX detection

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