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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"

45661 results found.

  1. GRB020812: possible afterglow candidate
  2. Early Time Limits for GRB020813
  3. GRB020812: possible afterglow candidate
  4. GRB020813, astrometric position
  5. Spectropolarimetry of GRB 020813
  6. GRB 020813 Afterglow Observations; Possible break
  7. GRB 020813: Absorption redshift
  8. GRB 020813 multiband optical observations
  9. GRB020813: optical afterglow
  10. GRB020813: Fading of Candidate OT
  11. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  12. GRB020813: Candidate Optical Afterglow
  13. GRB 020812 optical observation
  14. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  15. GRB 020715, optical observations
  16. GRB 020714, optical observations
  17. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  18. GRB020801: Candidate OT present in DSS
  19. HST Imaging of the Host of GRB 011121
  20. GRB020801, optical afterglow candidate
  21. Further refinement to IPN error box for GRB020531
  22. GRB020331: Late-time Optical Light Curve (re-submission)
  23. GRB020331: Late-time Optical Light Curve
  24. GRB 020405: HST observations reveal red bump
  25. IPN triangulation of GRB020714
  26. IPN triangulation of GRB020715 (=GRB150702)
  27. IPN triangulation of GRB020714
  28. IPN triangulation of GRB150702
  29. GRB 020410: Discovery of Probable OT by HST
  30. GRB 020124, HST observations of the fading afterglow
  31. IPN triangulation of GRB020708
  32. IPN triangulation of GRB020708
  33. IPN error box for GRB020706
  34. Correction to IPN error box for GRB020706
  35. IPN triangulation of GRB020706
  36. GRB 020705: Optical observations
  37. GRB 020625, optical observations
  38. GRB 020625: Optical observations
  39. GRB 020531: optical photometry of Chandra sources
  40. GRB020625 (=H2081): A Long Burst Localized by HETE
  41. HETE #2081: Optical observations
  42. The Probable Host Galaxy of GRB/XRF 020427
  43. GRB/XRF 020427, detection of an underlying system with the VLT
  44. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  45. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  46. AXP 1E2259+586: quasi-simultaneous optical observation
  47. AXP 1E2259+586 optical observations
  48. Fading Optical Source in the Field of GRB020531
  49. GRB 020531, INT+WFC deep optical upper limits
  50. SGR-like Bursts from the AXP 1E 2259+586
  51. GRB020405: polarimetric observations
  52. GRB 020531, simultaneous optical observations
  53. GRB 020604, optical observations
  54. GRB 020531/Candidate Redshift
  55. GRB020531: Detection of Candidate Host Galaxy
  56. GRB020531: Second epoch Chandra observations
  57. GRB020604, optical observations
  58. GRB020604, BVRcIc field photometry
  59. GRB020603, BVRcIc field observations
  60. GRB020531, BVRcIc field photometry
  61. GRB020531 Optical observations with TAROT
  62. GRB020531 Optical observations with TAROT
  63. GRB 020418, optical/near-IR observations
  64. GRB 020531, Radio Observations
  65. IPN triangulation of GRB020604
  66. GRB020531 Optical Observations
  67. GRB020531: Observations with the Chandra X-ray Observatory
  68. GRB 020603: Optical Observations
  69. GRB 020603, R-band observation
  70. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  71. GRB020531: Upper Limit for Detection of Two TAROT Sources
  72. GRB 020603: Optical observations
  73. IPN triangulation of GRB020603 (possible short/hard GRB)
  74. GRB 020531 optical observations with TAROT
  75. Refined IPN error box for GRB020531
  76. GRB020531, optical observations
  77. GRB020531: optical observations
  78. GRB020531, optical observation
  79. GRB020531(=H2042): Optical Observations
  80. IPN triangulation of the short, hard GRB020531 (=H2042)
  81. GRB020531(=H2042): Optical Observations
  82. GRB020531: Optical observations
  83. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  84. GRB 020525: Optical Observations
  85. GRB020525, optical observations
  86. IPN detection of possible bursts from SGR1806-20
  87. IPN triangulation of GRB020525
  88. XRF 020427: Sudden Ionospheric Disturbance (SID)
  89. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  90. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  91. IPN triangulation of a burst from SGR1806-20
  92. GRB/XRF 020427, Radio Observations
  93. HST detection of the likely host galaxy of GRB 020124
  94. GRB020405 field photometry at ESO
  95. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  96. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  97. GRB020321 : Optical observations.
  98. GRB020427 BeppoSAX NFI Observation
  99. XRF 020427
  100. GRB020331: Third Epoch and Revised Second Epoch Optical

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