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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"

37758 results found.

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

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