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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"

28061 results found.

  1. IPN triangulation of GRB020714
  2. IPN triangulation of GRB150702
  3. GRB 020410: Discovery of Probable OT by HST
  4. GRB 020124, HST observations of the fading afterglow
  5. IPN triangulation of GRB020708
  6. IPN triangulation of GRB020708
  7. Correction to IPN error box for GRB020706
  8. IPN triangulation of GRB020706
  9. GRB 020705: Optical observations
  10. GRB 020625, optical observations
  11. GRB 020625: Optical observations
  12. GRB 020531: optical photometry of Chandra sources
  13. GRB020625 (=H2081): A Long Burst Localized by HETE
  14. The Probable Host Galaxy of GRB/XRF 020427
  15. GRB/XRF 020427, detection of an underlying system with the VLT
  16. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  17. AXP 1E2259+586 optical observations
  18. Fading Optical Source in the Field of GRB020531
  19. GRB 020531, INT+WFC deep optical upper limits
  20. SGR-like Bursts from the AXP 1E 2259+586
  21. GRB020405: polarimetric observations
  22. GRB 020531, simultaneous optical observations
  23. GRB 020531/Candidate Redshift
  24. GRB020531: Detection of Candidate Host Galaxy
  25. GRB020531: Second epoch Chandra observations
  26. GRB020604, optical observations
  27. GRB020604, BVRcIc field photometry
  28. GRB020603, BVRcIc field observations
  29. GRB020531, BVRcIc field photometry
  30. GRB020531 Optical Observations
  31. GRB020531: Observations with the Chandra X-ray Observatory
  32. GRB020531, optical observations
  33. GRB020531: optical observations
  34. GRB020531(=H2042): Optical Observations
  35. GRB020531(=H2042): Optical Observations
  36. GRB020531: Optical observations
  37. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  38. GRB020525, optical observations
  39. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  40. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  41. HST detection of the likely host galaxy of GRB 020124
  42. GRB020405 field photometry at ESO
  43. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  44. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  45. GRB020321 : Optical observations.
  46. XRF 020427
  47. GRB 020124: Optical observations
  48. IPN triangulation of GRB020418
  49. GRB020405: VLT observations of the OT environment
  50. IPN triangulation of GRB020413
  51. GRB020405: predicted break
  52. GRB 020409: No Evidence for an Optical Afterglow
  53. GRB 020331 Kyoto observation on March 31
  54. GRB020410: BeppoSAX NFI observation
  55. X-ray afterglow of GRB020321
  56. GRB020331 optical observations with RIMOTS
  57. GRB020124 optical observations with RIBOTS/RIMOTS
  58. GRB 020321: Candidate X-ray Counterparts
  59. GRB020406(?), optical observations
  60. GRB 020405: Decay index
  61. Short RXTE/ASM transient 020406; may be a GRB
  62. GRB020405, Radio Observations
  63. GRB 020405, U-band observations
  64. GRB011212: Optical Observations
  65. GRB 020331: NIR Observations
  66. GRB020331 NIR observation at KPNO (re-submission)
  67. GRB02033 NIR observation at KPNO
  68. GRB020331 field photometry
  69. GRB 020331, NIR observations
  70. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  71. GRB 020322: BeppoSAX observations of the X-ray afterglow
  72. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  73. Near-Infrared Observations of GRB020322 at TIRGO
  74. GRB 020321, Radio Observations
  75. GRB 020322: Optical Observations
  76. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  77. GRB 020321: Optical observations
  78. GRB020317 BVRI field photometry
  79. GRB011211 revised BVRI field photometry
  80. GRB020305 BVRI field photometry
  81. GRB020322 BVRI field photometry
  82. GRB 020322: Optical Sources and Improved Astrometry
  83. GRB020317: optical observations
  84. GRB020321 optical observations
  85. GRB020321: a faint BeppoSAX detection
  86. GRB 020317 : KISO Optical Observations
  87. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  88. GRB 020305: Optical Observations
  89. GRB020317, optical observations
  90. GRB 020317: Optical observations
  91. GRB 011121: Third HST Epoch
  92. GRB020305: Properties of the Candidate Optical Afterglow
  93. GRB 011121: HST Observations reveal an intermediate-time multicolor
  94. GRB011130 (XRF011130) Second Epoch Chandra Observations
  95. GRB020305: Subaru Optical Observations
  96. XRF/GRB 011030: Detection of the Probable Host Galaxy
  97. GRB 020305: Candidate optical afterglow
  98. GRB020305, optical observations
  99. IPN triangulation of GRB020305 (HETE 1939)
  100. GRB020305 (=H1939): Localization of a GRB by HETE

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