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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"

35259 results found.

  1. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  2. HST Imaging of the Host of GRB 011121
  3. GRB020801, optical afterglow candidate
  4. Further refinement to IPN error box for GRB020531
  5. GRB020331: Late-time Optical Light Curve (re-submission)
  6. GRB020331: Late-time Optical Light Curve
  7. GRB 020405: HST observations reveal red bump
  8. IPN triangulation of GRB020714
  9. IPN triangulation of GRB020715 (=GRB150702)
  10. IPN triangulation of GRB020714
  11. IPN triangulation of GRB150702
  12. GRB 020410: Discovery of Probable OT by HST
  13. GRB 020124, HST observations of the fading afterglow
  14. IPN triangulation of GRB020708
  15. IPN triangulation of GRB020708
  16. IPN error box for GRB020706
  17. IPN triangulation of GRB020706
  18. GRB 020705: Optical observations
  19. GRB 020625, optical observations
  20. GRB 020625: Optical observations
  21. GRB 020531: optical photometry of Chandra sources
  22. GRB020625 (=H2081): A Long Burst Localized by HETE
  23. The Probable Host Galaxy of GRB/XRF 020427
  24. GRB/XRF 020427, detection of an underlying system with the VLT
  25. GRB 020531, INT+WFC deep optical upper limits
  26. GRB020405: polarimetric observations
  27. GRB 020531, simultaneous optical observations
  28. GRB 020604, optical observations
  29. GRB 020531/Candidate Redshift
  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 with TAROT
  36. GRB020531 Optical observations with TAROT
  37. GRB 020418, optical/near-IR observations
  38. GRB 020531, Radio Observations
  39. IPN triangulation of GRB020604
  40. GRB020531: Observations with the Chandra X-ray Observatory
  41. GRB 020603: Optical Observations
  42. GRB 020603, R-band observation
  43. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  44. GRB 020603: Optical observations
  45. IPN triangulation of GRB020603 (possible short/hard GRB)
  46. GRB 020531 optical observations with TAROT
  47. Refined IPN error box for GRB020531
  48. GRB020531, optical observations
  49. GRB020531(=H2042): Optical Observations
  50. IPN triangulation of the short, hard GRB020531 (=H2042)
  51. GRB020531(=H2042): Optical Observations
  52. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  53. GRB 020525: Optical Observations
  54. GRB020525, optical observations
  55. IPN detection of possible bursts from SGR1806-20
  56. IPN triangulation of GRB020525
  57. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  58. IPN triangulation of a burst from SGR1806-20
  59. GRB/XRF 020427, Radio Observations
  60. HST detection of the likely host galaxy of GRB 020124
  61. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  62. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  63. GRB020321 : Optical observations.
  64. GRB020427 BeppoSAX NFI Observation
  65. XRF 020427
  66. GRB020331: Third Epoch and Revised Second Epoch Optical
  67. The end of BSAX GRB activities
  68. GRB 020410, Radio Observations
  69. GRB 020418: Optical observations
  70. GRB 020124: Optical observations
  71. GRB 020418: Optical observations
  72. IPN triangulation of GRB020418
  73. GRB020405: VLT observations of the OT environment
  74. GRB020410: BeppoSAX NFI observations refined analysis
  75. GRB 020409: Optical Observations
  76. Mars Odyssey joins the IPN
  77. IPN triangulation of GRB020413
  78. GRB 020409, 2-nd epoch optical observations at Terskol.
  79. GRB 020409: Optical observations
  80. GRB 020409, No Optical Detection to R = 22
  81. GRB 020409: No Evidence for an Optical Afterglow
  82. GRB 020409, 2nd epoch optical observations
  83. GRB 020331 Kyoto observation on March 31
  84. GRB 020409
  85. GRB 020409 SARA Observations
  86. GRB "020411"
  87. GRB 020409, No Optical Detection to R = 20
  88. GRB020410: BeppoSAX NFI observation
  89. GRB 020409: Optical observations
  90. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  91. GRB 020410, optical observations
  92. BeppoSAX ALERT: possible GRB020411
  93. GRB 020409, optical observations
  94. GRB 020409: Optical Observations
  95. GRB020406(?), optical observations
  96. GRB020410, optical observations
  97. BeppoSAX ALERT: possible GRB020410
  98. X-ray afterglow of GRB020321
  99. BeppoSAX GRB : GRB020409
  100. GRB020405: VLT optical observations and V band decay slope

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