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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"

32489 results found.

  1. GRB 020813, radio detection
  2. GRB020813, optical observations
  3. Millimeter observation of GRB 020813
  4. GRB020812: optical observations
  5. GRB 020813 : KISO multiband optical observations
  6. GRB020813, optical observations
  7. IPN error box for GRB020813
  8. IPN triangulation of GRB020813
  9. GRB020812: possible afterglow candidate
  10. Early Time Limits for GRB020813
  11. GRB020813, astrometric position
  12. Spectropolarimetry of GRB 020813
  13. GRB 020813 Afterglow Observations; Possible break
  14. GRB 020813: Absorption redshift
  15. GRB020813: optical afterglow
  16. GRB020813: Fading of Candidate OT
  17. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  18. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  19. GRB 020715, optical observations
  20. GRB 020714, optical observations
  21. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  22. GRB020801: Candidate OT present in DSS
  23. Further refinement to IPN error box for GRB020531
  24. GRB020331: Late-time Optical Light Curve (re-submission)
  25. GRB020331: Late-time Optical Light Curve
  26. GRB 020405: HST observations reveal red bump
  27. IPN triangulation of GRB020714
  28. IPN triangulation of GRB020715 (=GRB150702)
  29. GRB 020410: Discovery of Probable OT by HST
  30. GRB 020124, HST observations of the fading afterglow
  31. IPN triangulation of GRB020708
  32. IPN triangulation of GRB020708
  33. IPN error box for GRB020706
  34. Correction to IPN error box for GRB020706
  35. IPN triangulation of GRB020706
  36. GRB 020625, optical observations
  37. GRB 020531: optical photometry of Chandra sources
  38. GRB020625 (=H2081): A Long Burst Localized by HETE
  39. The Probable Host Galaxy of GRB/XRF 020427
  40. GRB/XRF 020427, detection of an underlying system with the VLT
  41. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  42. AXP 1E2259+586: quasi-simultaneous optical observation
  43. AXP 1E2259+586 optical observations
  44. Fading Optical Source in the Field of GRB020531
  45. GRB 020531, INT+WFC deep optical upper limits
  46. GRB020405: polarimetric observations
  47. GRB 020531, simultaneous optical observations
  48. GRB 020604, optical observations
  49. GRB 020531/Candidate Redshift
  50. GRB020531: Detection of Candidate Host Galaxy
  51. GRB020531: Second epoch Chandra observations
  52. GRB020604, optical observations
  53. GRB020604, BVRcIc field photometry
  54. GRB020603, BVRcIc field observations
  55. GRB020531, BVRcIc field photometry
  56. GRB020531 Optical observations with TAROT
  57. GRB020531 Optical observations with TAROT
  58. GRB 020531, Radio Observations
  59. GRB020531 Optical Observations
  60. GRB 020603: Optical Observations
  61. GRB 020603, R-band observation
  62. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  63. GRB020531: Upper Limit for Detection of Two TAROT Sources
  64. GRB 020603: Optical observations
  65. GRB 020531 optical observations with TAROT
  66. Refined IPN error box for GRB020531
  67. GRB020531, optical observations
  68. GRB020531: optical observations
  69. GRB020531(=H2042): Optical Observations
  70. IPN triangulation of the short, hard GRB020531 (=H2042)
  71. GRB020531(=H2042): Optical Observations
  72. GRB020531: Optical observations
  73. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  74. GRB 020525: Optical Observations
  75. GRB020525, optical observations
  76. IPN detection of possible bursts from SGR1806-20
  77. XRF 020427: Sudden Ionospheric Disturbance (SID)
  78. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  79. GRB/XRF 020427, Radio Observations
  80. HST detection of the likely host galaxy of GRB 020124
  81. GRB020405 field photometry at ESO
  82. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  83. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  84. GRB020321 : Optical observations.
  85. GRB020331: Third Epoch and Revised Second Epoch Optical
  86. GRB 020410, Radio Observations
  87. GRB 020418: Optical observations
  88. GRB 020124: Optical observations
  89. GRB 020418: Optical observations
  90. GRB020405: VLT observations of the OT environment
  91. GRB020410: BeppoSAX NFI observations refined analysis
  92. GRB 020409: Optical Observations
  93. Mars Odyssey joins the IPN
  94. GRB 020409, 2-nd epoch optical observations at Terskol.
  95. GRB020405: predicted break
  96. GRB 020409: Optical observations
  97. GRB 020409, No Optical Detection to R = 22
  98. GRB 020409: No Evidence for an Optical Afterglow
  99. GRB 020409, 2nd epoch optical observations
  100. GRB 020331 Kyoto observation on March 31

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