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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"

36014 results found.

  1. IPN triangulation of GRB020914
  2. GRB 020305: HST/STIS observations
  3. Confirmation of IPN error box for GRB020910
  4. IPN triangulation of GRB020910
  5. IPN GCN Circulars now to be issued without restriction
  6. Single IPN error box for GRB020904
  7. XRF 020903: optical observation at Kyoto
  8. GRB020322 : HST/STIS observations
  9. IPN triangulation of GRB020904
  10. IPN detection of a burst from SGR1900+14
  11. INTEGRAL GRBs added to GCN
  12. GRB020813: High-resolution optical spectroscopy
  13. GRB 020812: optical observation at Kyoto University
  14. Second epoch K band imaging of GRB 020819
  15. GRB020813, Baade 6.5m data now available
  16. GRB 020813 : HST observations
  17. Confirming no variability for GRB02081
  18. GRB020819 : Optical observations at KISO
  19. GRB 020812: early time optical observation at Ouda Station
  20. GRB020813: VRI Decay Slopes
  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. GRB020813, UBVRI field calibration
  28. GRB 020813: addendum to GCN 1498
  29. GRB020813: optical observations at Bisei
  30. GRB020813: V-band decay slope
  31. Polarimetry of GRB020813: evidence for variability
  32. GRB020813 IRAM millimeter observations
  33. GRB020812: optical observations
  34. GRB 020812: optical observation at Bisei
  35. GRB020813: optical observations; possible host galaxy
  36. GRB 020813, radio detection
  37. GRB 020812 : optical afterglow candidate
  38. Millimeter observation of GRB 020813
  39. GRB020812: optical observations
  40. GRB 020813 : KISO multiband optical observations
  41. IPN error box for GRB020813
  42. IPN triangulation of GRB020813
  43. GRB020812: possible afterglow candidate
  44. Early Time Limits for GRB020813
  45. GRB020812: possible afterglow candidate
  46. GRB020813, astrometric position
  47. Spectropolarimetry of GRB 020813
  48. GRB 020813 Afterglow Observations; Possible break
  49. GRB 020813: Absorption redshift
  50. GRB 020813 multiband optical observations
  51. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  52. GRB 020812 optical observation
  53. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  54. GRB 020715, optical observations
  55. GRB 020714, optical observations
  56. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  57. HST Imaging of the Host of GRB 011121
  58. GRB020801, optical afterglow candidate
  59. Further refinement to IPN error box for GRB020531
  60. GRB020331: Late-time Optical Light Curve (re-submission)
  61. GRB020331: Late-time Optical Light Curve
  62. GRB 020405: HST observations reveal red bump
  63. IPN triangulation of GRB020714
  64. IPN triangulation of GRB020715 (=GRB150702)
  65. IPN triangulation of GRB020714
  66. IPN triangulation of GRB150702
  67. GRB 020410: Discovery of Probable OT by HST
  68. GRB 020124, HST observations of the fading afterglow
  69. IPN triangulation of GRB020708
  70. IPN triangulation of GRB020708
  71. IPN error box for GRB020706
  72. IPN triangulation of GRB020706
  73. GRB 020705: Optical observations
  74. GRB 020625, optical observations
  75. GRB 020625: Optical observations
  76. GRB 020531: optical photometry of Chandra sources
  77. GRB020625 (=H2081): A Long Burst Localized by HETE
  78. The Probable Host Galaxy of GRB/XRF 020427
  79. GRB/XRF 020427, detection of an underlying system with the VLT
  80. GRB 020531, INT+WFC deep optical upper limits
  81. GRB020405: polarimetric observations
  82. GRB 020531, simultaneous optical observations
  83. GRB 020604, optical observations
  84. GRB 020531/Candidate Redshift
  85. GRB020531: Second epoch Chandra observations
  86. GRB020604, optical observations
  87. GRB020604, BVRcIc field photometry
  88. GRB020603, BVRcIc field observations
  89. GRB020531, BVRcIc field photometry
  90. GRB020531 Optical observations with TAROT
  91. GRB020531 Optical observations with TAROT
  92. GRB 020418, optical/near-IR observations
  93. GRB 020531, Radio Observations
  94. IPN triangulation of GRB020604
  95. GRB020531: Observations with the Chandra X-ray Observatory
  96. GRB 020603: Optical Observations
  97. GRB 020603, R-band observation
  98. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  99. GRB 020603: Optical observations
  100. IPN triangulation of GRB020603 (possible short/hard GRB)

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