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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"

45501 results found.

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

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