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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"

32510 results found.

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

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