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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"

32509 results found.

  1. GRB020405 field photometry at ESO
  2. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  3. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  4. GRB020321 : Optical observations.
  5. GRB020331: Third Epoch and Revised Second Epoch Optical
  6. GRB 020410, Radio Observations
  7. GRB 020418: Optical observations
  8. GRB 020124: Optical observations
  9. GRB 020418: Optical observations
  10. GRB020405: VLT observations of the OT environment
  11. GRB020410: BeppoSAX NFI observations refined analysis
  12. GRB 020409: Optical Observations
  13. Mars Odyssey joins the IPN
  14. GRB 020409, 2-nd epoch optical observations at Terskol.
  15. GRB020405: predicted break
  16. GRB 020409: Optical observations
  17. GRB 020409, No Optical Detection to R = 22
  18. GRB 020409: No Evidence for an Optical Afterglow
  19. GRB 020409, 2nd epoch optical observations
  20. GRB 020331 Kyoto observation on March 31
  21. GRB 020409, No Optical Detection to R = 20
  22. GRB 020409: Optical observations
  23. GRB 020410, optical observations
  24. GRB 020409, optical observations
  25. GRB 020409: Optical Observations
  26. GRB020406(?), optical observations
  27. X-ray afterglow of GRB020321
  28. GRB020331: Confirmation of Afterglow Candidate with Magellan
  29. GRB020405: VLT optical observations and V band decay slope
  30. GRB020331 optical observations with RIMOTS
  31. GRB020124 optical observations with RIBOTS/RIMOTS
  32. GRB 020321: Candidate X-ray Counterparts
  33. ASM GRB candidate 020406 refined error box
  34. GRB 020405: Moderate-resolution spectroscopy
  35. GRB020331: Optical Observations of Afterglow Candidate
  36. GRB020406(?), optical observations
  37. GRB020405: VLT optical observations
  38. Revised Photometry of the Optical Afterglow of GRB 020405
  39. GRB020405: OT observations
  40. GRB 020331: Candidate Optical Afterglow
  41. GRB 020405: Decay index
  42. GRB020405, Radio Observations
  43. GRB020405: VLT spectroscopy
  44. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  45. V band observations of GRB020405
  46. GRB 020405, U-band observations
  47. IPN localization of GRB020405
  48. GRB011212: Optical Observations
  49. GRB 020331: NIR Observations
  50. GRB 020331: NIR Observations
  51. GRB020331 field photometry
  52. GRB 020331, NIR observations
  53. GRB 020331: Optical observations
  54. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  55. GRB 020321: Infrared observations
  56. GRB 020322: BeppoSAX observations of the X-ray afterglow
  57. SN 2002ap - peak brightness date (SN/GRB?)
  58. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  59. GRB 020322, Radio observations
  60. Near-Infrared Observations of GRB020322 at TIRGO
  61. GRB 020321, Radio Observations
  62. GRB 020322: Optical Observations
  63. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  64. GRB 020321: Optical observations
  65. GRB020317 BVRI field photometry
  66. GRB011211 revised BVRI field photometry
  67. GRB020305 BVRI field photometry
  68. GRB020322 BVRI field photometry
  69. GRB 020322 optical observations
  70. GRB020322: Candidate Optical Afterglow
  71. GRB 020322 optical observation
  72. GRB 020322: Optical Sources and Improved Astrometry
  73. GRB020322, optical observations
  74. GRB 020322: Optical candidate
  75. XMM-Newton observation of GRB020322
  76. GRB020322: Optical Observations
  77. GRB 020321: Optical observations
  78. GRB 011121: Fourth Epoch of HST Imaging
  79. GRB020317: optical observations
  80. GRB020321 optical observations
  81. GRB020305: NIR observations
  82. GRB 020317 : KISO Optical Observations
  83. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  84. GRB 020305: Optical Observations
  85. GRB020317, optical observations
  86. GRB 011121: Third HST Epoch
  87. GRB020305: Properties of the Candidate Optical Afterglow
  88. GRB 011121: HST Observations reveal an intermediate-time multicolor
  89. GRB011121, possible supernova association
  90. GRB011130 (XRF011130) Second Epoch Chandra Observations
  91. GRB020305: Subaru Optical Observations
  92. GRB 020305: Optical observations
  93. XRF/GRB 011030 Images
  94. XRF/GRB 011030: Detection of the Probable Host Galaxy
  95. GRB 020305: Candidate optical afterglow
  96. Type Ic SN2002bl (SN/GRB?) Radio Observations
  97. GRB020305 (=H1939): Localization of a GRB by HETE
  98. HST Imaging of the afterglow and host of GRB 011121
  99. GRB 010921: HST Observations
  100. GRB020127: Further VLA Observations of Possible Counterparts

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