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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"

35272 results found.

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