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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"

32502 results found.

  1. GRB 020124: Optical observations
  2. GRB 020418: Optical observations
  3. GRB020405: VLT observations of the OT environment
  4. GRB020410: BeppoSAX NFI observations refined analysis
  5. GRB 020409: Optical Observations
  6. Mars Odyssey joins the IPN
  7. GRB 020409, 2-nd epoch optical observations at Terskol.
  8. GRB020405: predicted break
  9. GRB 020409: Optical observations
  10. GRB 020409, No Optical Detection to R = 22
  11. GRB 020409: No Evidence for an Optical Afterglow
  12. GRB 020409, 2nd epoch optical observations
  13. GRB 020331 Kyoto observation on March 31
  14. GRB 020409, No Optical Detection to R = 20
  15. GRB 020409: Optical observations
  16. GRB 020410, optical observations
  17. GRB 020409, optical observations
  18. GRB 020409: Optical Observations
  19. GRB020406(?), optical observations
  20. X-ray afterglow of GRB020321
  21. GRB020331: Confirmation of Afterglow Candidate with Magellan
  22. GRB020405: VLT optical observations and V band decay slope
  23. GRB020331 optical observations with RIMOTS
  24. GRB020124 optical observations with RIBOTS/RIMOTS
  25. GRB 020321: Candidate X-ray Counterparts
  26. ASM GRB candidate 020406 refined error box
  27. GRB 020405: Moderate-resolution spectroscopy
  28. GRB020331: Optical Observations of Afterglow Candidate
  29. GRB020406(?), optical observations
  30. GRB020405: VLT optical observations
  31. Revised Photometry of the Optical Afterglow of GRB 020405
  32. GRB020405: OT observations
  33. GRB 020331: Candidate Optical Afterglow
  34. GRB 020405: Decay index
  35. GRB020405, Radio Observations
  36. GRB020405: VLT spectroscopy
  37. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  38. V band observations of GRB020405
  39. GRB 020405, U-band observations
  40. IPN localization of GRB020405
  41. GRB011212: Optical Observations
  42. GRB 020331: NIR Observations
  43. GRB 020331: NIR Observations
  44. GRB020331 field photometry
  45. GRB 020331, NIR observations
  46. GRB 020331: Optical observations
  47. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  48. GRB 020321: Infrared observations
  49. GRB 020322: BeppoSAX observations of the X-ray afterglow
  50. SN 2002ap - peak brightness date (SN/GRB?)
  51. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  52. GRB 020322, Radio observations
  53. Near-Infrared Observations of GRB020322 at TIRGO
  54. GRB 020321, Radio Observations
  55. GRB 020322: Optical Observations
  56. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  57. GRB 020321: Optical observations
  58. GRB020317 BVRI field photometry
  59. GRB011211 revised BVRI field photometry
  60. GRB020305 BVRI field photometry
  61. GRB020322 BVRI field photometry
  62. GRB 020322 optical observations
  63. GRB020322: Candidate Optical Afterglow
  64. GRB 020322 optical observation
  65. GRB 020322: Optical Sources and Improved Astrometry
  66. GRB020322, optical observations
  67. GRB 020322: Optical candidate
  68. XMM-Newton observation of GRB020322
  69. GRB020322: Optical Observations
  70. GRB 020321: Optical observations
  71. GRB 011121: Fourth Epoch of HST Imaging
  72. GRB020317: optical observations
  73. GRB020321 optical observations
  74. GRB020305: NIR observations
  75. GRB 020317 : KISO Optical Observations
  76. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  77. GRB 020305: Optical Observations
  78. GRB020317, optical observations
  79. GRB 011121: Third HST Epoch
  80. GRB020305: Properties of the Candidate Optical Afterglow
  81. GRB 011121: HST Observations reveal an intermediate-time multicolor
  82. GRB011121, possible supernova association
  83. GRB011130 (XRF011130) Second Epoch Chandra Observations
  84. GRB020305: Subaru Optical Observations
  85. GRB 020305: Optical observations
  86. XRF/GRB 011030 Images
  87. XRF/GRB 011030: Detection of the Probable Host Galaxy
  88. GRB 020305: Candidate optical afterglow
  89. Type Ic SN2002bl (SN/GRB?) Radio Observations
  90. GRB020305 (=H1939): Localization of a GRB by HETE
  91. HST Imaging of the afterglow and host of GRB 011121
  92. GRB 010921: HST Observations
  93. GRB020127: Further VLA Observations of Possible Counterparts
  94. IPN detection of further SGR1900+14 activity
  95. SGR1900+14 activity
  96. GRB020124 BVRI field photometry
  97. GRB020127: Palomar and VLA Observations of Possible Counterparts
  98. GRB020127, WSRT radio observations
  99. GRB020127 Optical Observations
  100. SN2002ap (SN/GRB?) UBVRI Field Photometry

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