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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"
  1. IPN detection of a burst from SGR1900+14
  2. XRF 020903, optical observations
  3. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  4. INTEGRAL GRBs added to GCN
  5. GRB020813: optical observation
  6. GRB020812: optical observation
  7. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  8. SGR1900+14 burst localized by HETE
  9. GRB020813: High-resolution optical spectroscopy
  10. GRB020819: optical observations at Bisei
  11. GRB020812: negative optical observations
  12. GRB 020812: optical observation at Kyoto University
  13. Second epoch K band imaging of GRB 020819
  14. GRB020813, Baade 6.5m data now available
  15. GRB 020813 : HST observations
  16. Confirming no variability for GRB02081
  17. GRB020819 : Optical observations at KISO
  18. GRB 020812: early time optical observation at Ouda Station
  19. GRB020813: VRI Decay Slopes
  20. GRB020813: Magellan BVRI Photometry
  21. GRB 020819 : OT candidate - confirmation of non variability
  22. GRB 020819: Optical observations
  23. K band observation of GRB 020819
  24. GRB020819: optical observations
  25. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  26. IPN triangulation of GRB020819 (HETE 2275)
  27. HETE 2275: Optical observations
  28. GRB020813: optical and NIR observations
  29. GRB020813: Fading X-ray Afterglow Observed with Chandra
  30. GRB020813, UBVRI field calibration
  31. GRB 020813: addendum to GCN 1498
  32. GRB020813: optical observations at Bisei
  33. GRB020813: V-band decay slope
  34. GRB020812: NIR observations
  35. Polarimetry of GRB020813: evidence for variability
  36. GRB020813 IRAM millimeter observations
  37. GRB020812: optical observations
  38. GRB020813: High-Resolution Optical Observations
  39. GRB020813(=H2262): Revised Localization with HETE SXC
  40. GRB 020812: optical observation at Bisei
  41. GRB020813: Early Time Magnitude
  42. GRB020813: optical observations; possible host galaxy
  43. GRB 020813, radio detection
  44. GRB 020812 : optical afterglow candidate
  45. GRB020813, optical observations
  46. Millimeter observation of GRB 020813
  47. GRB020812: optical observations
  48. GRB 020813 : KISO multiband optical observations
  49. GRB020813, optical observations
  50. IPN error box for GRB020813
  51. IPN triangulation of GRB020813
  52. GRB020812: possible afterglow candidate
  53. Early Time Limits for GRB020813
  54. GRB020812: possible afterglow candidate
  55. GRB020813, astrometric position
  56. Spectropolarimetry of GRB 020813
  57. GRB 020813 Afterglow Observations; Possible break
  58. GRB 020813: Absorption redshift
  59. GRB 020813 multiband optical observations
  60. GRB020813: optical afterglow
  61. GRB020813: Fading of Candidate OT
  62. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  63. GRB020813: Candidate Optical Afterglow
  64. GRB 020812 optical observation
  65. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  66. GRB 020715, optical observations
  67. GRB 020714, optical observations
  68. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  69. GRB020801: Candidate OT present in DSS
  70. HST Imaging of the Host of GRB 011121
  71. GRB020801, optical afterglow candidate
  72. Further refinement to IPN error box for GRB020531
  73. GRB020331: Late-time Optical Light Curve (re-submission)
  74. GRB020331: Late-time Optical Light Curve
  75. GRB 020405: HST observations reveal red bump
  76. IPN triangulation of GRB020714
  77. IPN triangulation of GRB020715 (=GRB150702)
  78. IPN triangulation of GRB020714
  79. IPN triangulation of GRB150702
  80. GRB 020410: Discovery of Probable OT by HST
  81. GRB 020124, HST observations of the fading afterglow
  82. IPN triangulation of GRB020708
  83. IPN triangulation of GRB020708
  84. IPN error box for GRB020706
  85. Correction to IPN error box for GRB020706
  86. IPN triangulation of GRB020706
  87. GRB 020705: Optical observations
  88. GRB 020625, optical observations
  89. GRB 020625: Optical observations
  90. GRB 020531: optical photometry of Chandra sources
  91. GRB020625 (=H2081): A Long Burst Localized by HETE
  92. HETE #2081: Optical observations
  93. The Probable Host Galaxy of GRB/XRF 020427
  94. GRB/XRF 020427, detection of an underlying system with the VLT
  95. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  96. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  97. AXP 1E2259+586: quasi-simultaneous optical observation
  98. AXP 1E2259+586 optical observations
  99. Fading Optical Source in the Field of GRB020531
  100. GRB 020531, INT+WFC deep optical upper limits

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