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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"

37111 results found.

  1. Spectropolarimetry of GRB 020813
  2. GRB 020813 Afterglow Observations; Possible break
  3. GRB 020813: Absorption redshift
  4. GRB 020813 multiband optical observations
  5. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  6. GRB 020812 optical observation
  7. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  8. GRB 020715, optical observations
  9. GRB 020714, optical observations
  10. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  11. HST Imaging of the Host of GRB 011121
  12. GRB020801, optical afterglow candidate
  13. Further refinement to IPN error box for GRB020531
  14. GRB020331: Late-time Optical Light Curve (re-submission)
  15. GRB020331: Late-time Optical Light Curve
  16. GRB 020405: HST observations reveal red bump
  17. IPN triangulation of GRB020714
  18. IPN triangulation of GRB020715 (=GRB150702)
  19. IPN triangulation of GRB020714
  20. IPN triangulation of GRB150702
  21. GRB 020410: Discovery of Probable OT by HST
  22. GRB 020124, HST observations of the fading afterglow
  23. IPN triangulation of GRB020708
  24. IPN triangulation of GRB020708
  25. IPN error box for GRB020706
  26. IPN triangulation of GRB020706
  27. GRB 020705: Optical observations
  28. GRB 020625, optical observations
  29. GRB 020625: Optical observations
  30. GRB 020531: optical photometry of Chandra sources
  31. GRB020625 (=H2081): A Long Burst Localized by HETE
  32. The Probable Host Galaxy of GRB/XRF 020427
  33. GRB/XRF 020427, detection of an underlying system with the VLT
  34. GRB 020531, INT+WFC deep optical upper limits
  35. GRB020405: polarimetric observations
  36. GRB 020531, simultaneous optical observations
  37. GRB 020604, optical observations
  38. GRB 020531/Candidate Redshift
  39. GRB020531: Second epoch Chandra observations
  40. GRB020604, optical observations
  41. GRB020604, BVRcIc field photometry
  42. GRB020603, BVRcIc field observations
  43. GRB020531, BVRcIc field photometry
  44. GRB020531 Optical observations with TAROT
  45. GRB020531 Optical observations with TAROT
  46. GRB 020418, optical/near-IR observations
  47. GRB 020531, Radio Observations
  48. IPN triangulation of GRB020604
  49. GRB020531 Optical Observations
  50. GRB020531: Observations with the Chandra X-ray Observatory
  51. GRB 020603: Optical Observations
  52. GRB 020603, R-band observation
  53. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  54. GRB 020603: Optical observations
  55. IPN triangulation of GRB020603 (possible short/hard GRB)
  56. GRB 020531 optical observations with TAROT
  57. Refined IPN error box for GRB020531
  58. GRB020531, optical observations
  59. GRB020531(=H2042): Optical Observations
  60. IPN triangulation of the short, hard GRB020531 (=H2042)
  61. GRB020531(=H2042): Optical Observations
  62. GRB020531: Optical observations
  63. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  64. GRB 020525: Optical Observations
  65. GRB020525, optical observations
  66. IPN detection of possible bursts from SGR1806-20
  67. IPN triangulation of GRB020525
  68. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  69. IPN triangulation of a burst from SGR1806-20
  70. GRB/XRF 020427, Radio Observations
  71. HST detection of the likely host galaxy of GRB 020124
  72. GRB020405 field photometry at ESO
  73. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  74. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  75. GRB020321 : Optical observations.
  76. GRB020427 BeppoSAX NFI Observation
  77. XRF 020427
  78. GRB020331: Third Epoch and Revised Second Epoch Optical
  79. The end of BSAX GRB activities
  80. GRB 020410, Radio Observations
  81. GRB 020418: Optical observations
  82. GRB 020124: Optical observations
  83. GRB 020418: Optical observations
  84. IPN triangulation of GRB020418
  85. GRB020405: VLT observations of the OT environment
  86. GRB020410: BeppoSAX NFI observations refined analysis
  87. GRB 020409: Optical Observations
  88. Mars Odyssey joins the IPN
  89. IPN triangulation of GRB020413
  90. GRB 020409, 2-nd epoch optical observations at Terskol.
  91. GRB 020409: Optical observations
  92. GRB 020409, No Optical Detection to R = 22
  93. GRB020410: second BeppoSAX NFI observation
  94. GRB 020409: No Evidence for an Optical Afterglow
  95. GRB 020409, 2nd epoch optical observations
  96. GRB 020331 Kyoto observation on March 31
  97. GRB 020409
  98. GRB 020409 SARA Observations
  99. GRB "020411"
  100. GRB 020409, No Optical Detection to R = 20

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