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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"

32508 results found.

  1. GRB 020819 : OT candidate - confirmation of non variability
  2. GRB 020819: Optical observations
  3. K band observation of GRB 020819
  4. GRB020819: optical observations
  5. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  6. HETE 2275: Optical observations
  7. GRB020813: optical and NIR observations
  8. GRB020813, UBVRI field calibration
  9. GRB 020813: addendum to GCN 1498
  10. GRB020813: optical observations at Bisei
  11. GRB020813: V-band decay slope
  12. GRB020812: NIR observations
  13. Polarimetry of GRB020813: evidence for variability
  14. GRB020813 IRAM millimeter observations
  15. GRB020813: High-Resolution Optical Observations
  16. GRB020813(=H2262): Revised Localization with HETE SXC
  17. GRB 020812: optical observation at Bisei
  18. GRB020813: Early Time Magnitude
  19. GRB020813: optical observations; possible host galaxy
  20. GRB 020813, radio detection
  21. GRB020813, optical observations
  22. Millimeter observation of GRB 020813
  23. GRB020812: optical observations
  24. GRB 020813 : KISO multiband optical observations
  25. GRB020813, optical observations
  26. IPN error box for GRB020813
  27. IPN triangulation of GRB020813
  28. GRB020812: possible afterglow candidate
  29. Early Time Limits for GRB020813
  30. GRB020813, astrometric position
  31. Spectropolarimetry of GRB 020813
  32. GRB 020813 Afterglow Observations; Possible break
  33. GRB 020813: Absorption redshift
  34. GRB020813: optical afterglow
  35. GRB020813: Fading of Candidate OT
  36. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  37. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  38. GRB 020715, optical observations
  39. GRB 020714, optical observations
  40. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  41. GRB020801: Candidate OT present in DSS
  42. Further refinement to IPN error box for GRB020531
  43. GRB020331: Late-time Optical Light Curve (re-submission)
  44. GRB020331: Late-time Optical Light Curve
  45. GRB 020405: HST observations reveal red bump
  46. IPN triangulation of GRB020714
  47. IPN triangulation of GRB020715 (=GRB150702)
  48. GRB 020410: Discovery of Probable OT by HST
  49. GRB 020124, HST observations of the fading afterglow
  50. IPN triangulation of GRB020708
  51. IPN triangulation of GRB020708
  52. IPN error box for GRB020706
  53. Correction to IPN error box for GRB020706
  54. IPN triangulation of GRB020706
  55. GRB 020625, optical observations
  56. GRB 020531: optical photometry of Chandra sources
  57. GRB020625 (=H2081): A Long Burst Localized by HETE
  58. The Probable Host Galaxy of GRB/XRF 020427
  59. GRB/XRF 020427, detection of an underlying system with the VLT
  60. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  61. AXP 1E2259+586: quasi-simultaneous optical observation
  62. AXP 1E2259+586 optical observations
  63. Fading Optical Source in the Field of GRB020531
  64. GRB 020531, INT+WFC deep optical upper limits
  65. GRB020405: polarimetric observations
  66. GRB 020531, simultaneous optical observations
  67. GRB 020604, optical observations
  68. GRB 020531/Candidate Redshift
  69. GRB020531: Detection of Candidate Host Galaxy
  70. GRB020531: Second epoch Chandra observations
  71. GRB020604, optical observations
  72. GRB020604, BVRcIc field photometry
  73. GRB020603, BVRcIc field observations
  74. GRB020531, BVRcIc field photometry
  75. GRB020531 Optical observations with TAROT
  76. GRB020531 Optical observations with TAROT
  77. GRB 020531, Radio Observations
  78. GRB020531 Optical Observations
  79. GRB 020603: Optical Observations
  80. GRB 020603, R-band observation
  81. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  82. GRB020531: Upper Limit for Detection of Two TAROT Sources
  83. GRB 020603: Optical observations
  84. GRB 020531 optical observations with TAROT
  85. Refined IPN error box for GRB020531
  86. GRB020531, optical observations
  87. GRB020531: optical observations
  88. GRB020531(=H2042): Optical Observations
  89. IPN triangulation of the short, hard GRB020531 (=H2042)
  90. GRB020531(=H2042): Optical Observations
  91. GRB020531: Optical observations
  92. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  93. GRB 020525: Optical Observations
  94. GRB020525, optical observations
  95. IPN detection of possible bursts from SGR1806-20
  96. XRF 020427: Sudden Ionospheric Disturbance (SID)
  97. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  98. GRB/XRF 020427, Radio Observations
  99. HST detection of the likely host galaxy of GRB 020124
  100. GRB020405 field photometry at ESO

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