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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"

32504 results found.

  1. GRB 020410, Radio Observations
  2. GRB 020418: Optical observations
  3. GRB 020124: Optical observations
  4. GRB 020418: Optical observations
  5. GRB020405: VLT observations of the OT environment
  6. GRB020410: BeppoSAX NFI observations refined analysis
  7. GRB 020409: Optical Observations
  8. Mars Odyssey joins the IPN
  9. GRB 020409, 2-nd epoch optical observations at Terskol.
  10. GRB020405: predicted break
  11. GRB 020409: Optical observations
  12. GRB 020409, No Optical Detection to R = 22
  13. GRB 020409: No Evidence for an Optical Afterglow
  14. GRB 020409, 2nd epoch optical observations
  15. GRB 020331 Kyoto observation on March 31
  16. GRB 020409, No Optical Detection to R = 20
  17. GRB 020409: Optical observations
  18. GRB 020410, optical observations
  19. GRB 020409, optical observations
  20. GRB 020409: Optical Observations
  21. GRB020406(?), optical observations
  22. X-ray afterglow of GRB020321
  23. GRB020331: Confirmation of Afterglow Candidate with Magellan
  24. GRB020405: VLT optical observations and V band decay slope
  25. GRB020331 optical observations with RIMOTS
  26. GRB020124 optical observations with RIBOTS/RIMOTS
  27. GRB 020321: Candidate X-ray Counterparts
  28. ASM GRB candidate 020406 refined error box
  29. GRB 020405: Moderate-resolution spectroscopy
  30. GRB020331: Optical Observations of Afterglow Candidate
  31. GRB020406(?), optical observations
  32. GRB020405: VLT optical observations
  33. Revised Photometry of the Optical Afterglow of GRB 020405
  34. GRB020405: OT observations
  35. GRB 020331: Candidate Optical Afterglow
  36. GRB 020405: Decay index
  37. GRB020405, Radio Observations
  38. GRB020405: VLT spectroscopy
  39. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  40. V band observations of GRB020405
  41. GRB 020405, U-band observations
  42. IPN localization of GRB020405
  43. GRB011212: Optical Observations
  44. GRB 020331: NIR Observations
  45. GRB 020331: NIR Observations
  46. GRB020331 field photometry
  47. GRB 020331, NIR observations
  48. GRB 020331: Optical observations
  49. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  50. GRB 020321: Infrared observations
  51. GRB 020322: BeppoSAX observations of the X-ray afterglow
  52. SN 2002ap - peak brightness date (SN/GRB?)
  53. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  54. GRB 020322, Radio observations
  55. Near-Infrared Observations of GRB020322 at TIRGO
  56. GRB 020321, Radio Observations
  57. GRB 020322: Optical Observations
  58. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  59. GRB 020321: Optical observations
  60. GRB020317 BVRI field photometry
  61. GRB011211 revised BVRI field photometry
  62. GRB020305 BVRI field photometry
  63. GRB020322 BVRI field photometry
  64. GRB 020322 optical observations
  65. GRB020322: Candidate Optical Afterglow
  66. GRB 020322 optical observation
  67. GRB 020322: Optical Sources and Improved Astrometry
  68. GRB020322, optical observations
  69. GRB 020322: Optical candidate
  70. XMM-Newton observation of GRB020322
  71. GRB020322: Optical Observations
  72. GRB 020321: Optical observations
  73. GRB 011121: Fourth Epoch of HST Imaging
  74. GRB020317: optical observations
  75. GRB020321 optical observations
  76. GRB020305: NIR observations
  77. GRB 020317 : KISO Optical Observations
  78. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  79. GRB 020305: Optical Observations
  80. GRB020317, optical observations
  81. GRB 011121: Third HST Epoch
  82. GRB020305: Properties of the Candidate Optical Afterglow
  83. GRB 011121: HST Observations reveal an intermediate-time multicolor
  84. GRB011121, possible supernova association
  85. GRB011130 (XRF011130) Second Epoch Chandra Observations
  86. GRB020305: Subaru Optical Observations
  87. GRB 020305: Optical observations
  88. XRF/GRB 011030 Images
  89. XRF/GRB 011030: Detection of the Probable Host Galaxy
  90. GRB 020305: Candidate optical afterglow
  91. Type Ic SN2002bl (SN/GRB?) Radio Observations
  92. GRB020305 (=H1939): Localization of a GRB by HETE
  93. HST Imaging of the afterglow and host of GRB 011121
  94. GRB 010921: HST Observations
  95. GRB020127: Further VLA Observations of Possible Counterparts
  96. IPN detection of further SGR1900+14 activity
  97. SGR1900+14 activity
  98. GRB020124 BVRI field photometry
  99. GRB020127: Palomar and VLA Observations of Possible Counterparts
  100. GRB020127, WSRT radio observations

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