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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"

17059 results found.

  1. GRB020813: High-Resolution Optical Observations
  2. GRB020813: Early Time Magnitude
  3. GRB020812: optical observations
  4. GRB020813, optical observations
  5. GRB020813, astrometric position
  6. GRB 020812 optical observation
  7. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  8. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  9. HST Imaging of the Host of GRB 011121
  10. GRB020801, optical afterglow candidate
  11. Further refinement to IPN error box for GRB020531
  12. GRB020331: Late-time Optical Light Curve (re-submission)
  13. GRB020331: Late-time Optical Light Curve
  14. GRB 020410: Discovery of Probable OT by HST
  15. IPN triangulation of GRB020708
  16. GRB 020705: Optical observations
  17. GRB 020625, optical observations
  18. GRB 020625: Optical observations
  19. GRB 020531: optical photometry of Chandra sources
  20. GRB020625 (=H2081): A Long Burst Localized by HETE
  21. The Probable Host Galaxy of GRB/XRF 020427
  22. GRB/XRF 020427, detection of an underlying system with the VLT
  23. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  24. AXP 1E2259+586 optical observations
  25. Fading Optical Source in the Field of GRB020531
  26. GRB 020531, INT+WFC deep optical upper limits
  27. GRB020405: polarimetric observations
  28. GRB 020531, simultaneous optical observations
  29. GRB 020604, optical observations
  30. GRB020531: Second epoch Chandra observations
  31. GRB020604, optical observations
  32. GRB020604, BVRcIc field photometry
  33. GRB020603, BVRcIc field observations
  34. GRB020531, BVRcIc field photometry
  35. GRB020531 Optical Observations
  36. GRB020531: Observations with the Chandra X-ray Observatory
  37. GRB020531, optical observations
  38. GRB020531(=H2042): Optical Observations
  39. GRB020531(=H2042): Optical Observations
  40. GRB020525, optical observations
  41. GRB020405 field photometry at ESO
  42. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  43. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  44. XRF 020427
  45. GRB 020124: Optical observations
  46. GRB020405: VLT observations of the OT environment
  47. GRB 020409: No Evidence for an Optical Afterglow
  48. GRB 020331 Kyoto observation on March 31
  49. X-ray afterglow of GRB020321
  50. BeppoSAX GRB : GRB020409
  51. GRB020331 optical observations with RIMOTS
  52. GRB020124 optical observations with RIBOTS/RIMOTS
  53. GRB020406(?), optical observations
  54. GRB020405, Radio Observations
  55. GRB 020405, U-band observations
  56. GRB020331 NIR observation at KPNO (re-submission)
  57. GRB02033 NIR observation at KPNO
  58. GRB020331 field photometry
  59. GRB 020331, NIR observations
  60. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  61. GRB 020322: BeppoSAX observations of the X-ray afterglow
  62. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  63. Near-Infrared Observations of GRB020322 at TIRGO
  64. GRB 020322: Optical Observations
  65. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  66. GRB 020321: Optical observations
  67. GRB020317 BVRI field photometry
  68. GRB011211 revised BVRI field photometry
  69. GRB020305 BVRI field photometry
  70. GRB020322 BVRI field photometry
  71. GRB020322: Candidate Optical Afterglow
  72. GRB 020322: Optical Sources and Improved Astrometry
  73. GRB020317: optical observations
  74. GRB020321 optical observations
  75. GRB020321: a faint BeppoSAX detection
  76. GRB 020317 : KISO Optical Observations
  77. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  78. GRB 020305: Optical Observations
  79. GRB020317, optical observations
  80. GRB 020317: Optical observations
  81. GRB020305: Properties of the Candidate Optical Afterglow
  82. GRB011130 (XRF011130) Second Epoch Chandra Observations
  83. GRB 020305: Optical observations
  84. XRF/GRB 011030: Detection of the Probable Host Galaxy
  85. GRB 020305: Candidate optical afterglow
  86. GRB020305, optical observations
  87. HST Imaging of the afterglow and host of GRB 011121
  88. GRB 010921: HST Observations
  89. SGR1900+14 activity
  90. GRB020124 BVRI field photometry
  91. GRB020127 Optical Observations
  92. SN2002ap (SN/GRB?) UBVRI Field Photometry
  93. GRB020127: Chandra Observations and Prospective Counterparts
  94. pre-SN2002ap (SN/GRB?) imaging of M74
  95. GRB020124, optical observations
  96. GRB 020127, I-band observations starting 3.14-hr after the event
  97. GRB010921 Optical Observations
  98. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  99. GRB020124: Optical observations
  100. GRB020124: Optical observations

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