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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"

32506 results found.

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

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