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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

45515 results found.

  1. XRF 020903: Optical observations
  2. IPN triangulation of GRB020904
  3. XRF 020903: Optical observations
  4. IPN detection of a burst from SGR1900+14
  5. XRF 020903, optical observations
  6. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  7. INTEGRAL GRBs added to GCN
  8. GRB020813: optical observation
  9. GRB020812: optical observation
  10. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  11. SGR1900+14 burst localized by HETE
  12. GRB020813: High-resolution optical spectroscopy
  13. GRB020819: optical observations at Bisei
  14. GRB020812: negative optical observations
  15. GRB 020812: optical observation at Kyoto University
  16. Second epoch K band imaging of GRB 020819
  17. GRB020813, Baade 6.5m data now available
  18. GRB 020813 : HST observations
  19. Confirming no variability for GRB02081
  20. GRB020819 : Optical observations at KISO
  21. GRB 020812: early time optical observation at Ouda Station
  22. GRB020813: VRI Decay Slopes
  23. GRB020813: Magellan BVRI Photometry
  24. GRB 020819 : OT candidate - confirmation of non variability
  25. GRB 020819: Optical observations
  26. K band observation of GRB 020819
  27. GRB020819: optical observations
  28. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  29. IPN triangulation of GRB020819 (HETE 2275)
  30. HETE 2275: Optical observations
  31. GRB020813: optical and NIR observations
  32. GRB020813: Fading X-ray Afterglow Observed with Chandra
  33. GRB020813, UBVRI field calibration
  34. GRB 020813: addendum to GCN 1498
  35. GRB020813: optical observations at Bisei
  36. GRB020813: V-band decay slope
  37. GRB020812: NIR observations
  38. Polarimetry of GRB020813: evidence for variability
  39. GRB020813 IRAM millimeter observations
  40. GRB020812: optical observations
  41. GRB020813: High-Resolution Optical Observations
  42. GRB020813(=H2262): Revised Localization with HETE SXC
  43. GRB 020812: optical observation at Bisei
  44. GRB020813: Early Time Magnitude
  45. GRB020813: optical observations; possible host galaxy
  46. GRB 020813, radio detection
  47. GRB 020812 : optical afterglow candidate
  48. GRB020813, optical observations
  49. Millimeter observation of GRB 020813
  50. GRB020812: optical observations
  51. GRB 020813 : KISO multiband optical observations
  52. GRB020813, optical observations
  53. IPN error box for GRB020813
  54. IPN triangulation of GRB020813
  55. GRB020812: possible afterglow candidate
  56. Early Time Limits for GRB020813
  57. GRB020812: possible afterglow candidate
  58. GRB020813, astrometric position
  59. Spectropolarimetry of GRB 020813
  60. GRB 020813 Afterglow Observations; Possible break
  61. GRB 020813: Absorption redshift
  62. GRB 020813 multiband optical observations
  63. GRB020813: optical afterglow
  64. GRB020813: Fading of Candidate OT
  65. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  66. GRB020813: Candidate Optical Afterglow
  67. GRB 020812 optical observation
  68. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  69. GRB 020715, optical observations
  70. GRB 020714, optical observations
  71. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  72. GRB020801: Candidate OT present in DSS
  73. HST Imaging of the Host of GRB 011121
  74. GRB020801, optical afterglow candidate
  75. Further refinement to IPN error box for GRB020531
  76. GRB020331: Late-time Optical Light Curve (re-submission)
  77. GRB020331: Late-time Optical Light Curve
  78. GRB 020405: HST observations reveal red bump
  79. IPN triangulation of GRB020714
  80. IPN triangulation of GRB020715 (=GRB150702)
  81. IPN triangulation of GRB020714
  82. IPN triangulation of GRB150702
  83. GRB 020410: Discovery of Probable OT by HST
  84. GRB 020124, HST observations of the fading afterglow
  85. IPN triangulation of GRB020708
  86. IPN triangulation of GRB020708
  87. IPN error box for GRB020706
  88. Correction to IPN error box for GRB020706
  89. IPN triangulation of GRB020706
  90. GRB 020705: Optical observations
  91. GRB 020625, optical observations
  92. GRB 020625: Optical observations
  93. GRB 020531: optical photometry of Chandra sources
  94. GRB020625 (=H2081): A Long Burst Localized by HETE
  95. HETE #2081: Optical observations
  96. The Probable Host Galaxy of GRB/XRF 020427
  97. GRB/XRF 020427, detection of an underlying system with the VLT
  98. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  99. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  100. AXP 1E2259+586: quasi-simultaneous optical observation

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