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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"

32488 results found.

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

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