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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"

44624 results found.

  1. GRB020812: negative optical observations
  2. GRB 020812: optical observation at Kyoto University
  3. Second epoch K band imaging of GRB 020819
  4. GRB020813, Baade 6.5m data now available
  5. GRB 020813 : HST observations
  6. Confirming no variability for GRB02081
  7. GRB020819 : Optical observations at KISO
  8. GRB 020812: early time optical observation at Ouda Station
  9. GRB020813: VRI Decay Slopes
  10. GRB020813: Magellan BVRI Photometry
  11. GRB 020819 : OT candidate - confirmation of non variability
  12. GRB 020819: Optical observations
  13. K band observation of GRB 020819
  14. GRB020819: optical observations
  15. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  16. IPN triangulation of GRB020819 (HETE 2275)
  17. HETE 2275: Optical observations
  18. GRB020813: optical and NIR observations
  19. GRB020813: Fading X-ray Afterglow Observed with Chandra
  20. GRB020813, UBVRI field calibration
  21. GRB 020813: addendum to GCN 1498
  22. GRB020813: optical observations at Bisei
  23. GRB020813: V-band decay slope
  24. GRB020812: NIR observations
  25. Polarimetry of GRB020813: evidence for variability
  26. GRB020813 IRAM millimeter observations
  27. GRB020812: optical observations
  28. GRB020813: High-Resolution Optical Observations
  29. GRB020813(=H2262): Revised Localization with HETE SXC
  30. GRB 020812: optical observation at Bisei
  31. GRB020813: Early Time Magnitude
  32. GRB020813: optical observations; possible host galaxy
  33. GRB 020813, radio detection
  34. GRB 020812 : optical afterglow candidate
  35. GRB020813, optical observations
  36. Millimeter observation of GRB 020813
  37. GRB020812: optical observations
  38. GRB 020813 : KISO multiband optical observations
  39. GRB020813, optical observations
  40. IPN error box for GRB020813
  41. IPN triangulation of GRB020813
  42. GRB020812: possible afterglow candidate
  43. Early Time Limits for GRB020813
  44. GRB020812: possible afterglow candidate
  45. GRB020813, astrometric position
  46. Spectropolarimetry of GRB 020813
  47. GRB 020813 Afterglow Observations; Possible break
  48. GRB 020813: Absorption redshift
  49. GRB 020813 multiband optical observations
  50. GRB020813: optical afterglow
  51. GRB020813: Fading of Candidate OT
  52. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  53. GRB020813: Candidate Optical Afterglow
  54. GRB 020812 optical observation
  55. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  56. GRB 020715, optical observations
  57. GRB 020714, optical observations
  58. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  59. GRB020801: Candidate OT present in DSS
  60. HST Imaging of the Host of GRB 011121
  61. GRB020801, optical afterglow candidate
  62. Further refinement to IPN error box for GRB020531
  63. GRB020331: Late-time Optical Light Curve (re-submission)
  64. GRB020331: Late-time Optical Light Curve
  65. GRB 020405: HST observations reveal red bump
  66. IPN triangulation of GRB020714
  67. IPN triangulation of GRB020715 (=GRB150702)
  68. IPN triangulation of GRB020714
  69. IPN triangulation of GRB150702
  70. GRB 020410: Discovery of Probable OT by HST
  71. GRB 020124, HST observations of the fading afterglow
  72. IPN triangulation of GRB020708
  73. IPN triangulation of GRB020708
  74. IPN error box for GRB020706
  75. Correction to IPN error box for GRB020706
  76. IPN triangulation of GRB020706
  77. GRB 020705: Optical observations
  78. GRB 020625, optical observations
  79. GRB 020625: Optical observations
  80. GRB 020531: optical photometry of Chandra sources
  81. GRB020625 (=H2081): A Long Burst Localized by HETE
  82. HETE #2081: Optical observations
  83. The Probable Host Galaxy of GRB/XRF 020427
  84. GRB/XRF 020427, detection of an underlying system with the VLT
  85. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  86. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  87. AXP 1E2259+586: quasi-simultaneous optical observation
  88. AXP 1E2259+586 optical observations
  89. Fading Optical Source in the Field of GRB020531
  90. GRB 020531, INT+WFC deep optical upper limits
  91. SGR-like Bursts from the AXP 1E 2259+586
  92. GRB020405: polarimetric observations
  93. GRB 020531, simultaneous optical observations
  94. GRB 020604, optical observations
  95. GRB 020531/Candidate Redshift
  96. GRB020531: Detection of Candidate Host Galaxy
  97. GRB020531: Second epoch Chandra observations
  98. GRB020604, optical observations
  99. GRB020604, BVRcIc field photometry
  100. GRB020603, BVRcIc field observations

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