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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"

32569 results found.

  1. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  2. GRB020801: Candidate OT present in DSS
  3. Further refinement to IPN error box for GRB020531
  4. GRB020331: Late-time Optical Light Curve (re-submission)
  5. GRB020331: Late-time Optical Light Curve
  6. GRB 020405: HST observations reveal red bump
  7. IPN triangulation of GRB020714
  8. IPN triangulation of GRB020715 (=GRB150702)
  9. GRB 020410: Discovery of Probable OT by HST
  10. GRB 020124, HST observations of the fading afterglow
  11. IPN triangulation of GRB020708
  12. IPN triangulation of GRB020708
  13. IPN error box for GRB020706
  14. Correction to IPN error box for GRB020706
  15. IPN triangulation of GRB020706
  16. GRB 020625, optical observations
  17. GRB 020531: optical photometry of Chandra sources
  18. GRB020625 (=H2081): A Long Burst Localized by HETE
  19. The Probable Host Galaxy of GRB/XRF 020427
  20. GRB/XRF 020427, detection of an underlying system with the VLT
  21. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  22. AXP 1E2259+586: quasi-simultaneous optical observation
  23. AXP 1E2259+586 optical observations
  24. Fading Optical Source in the Field of GRB020531
  25. GRB 020531, INT+WFC deep optical upper limits
  26. GRB020405: polarimetric observations
  27. GRB 020531, simultaneous optical observations
  28. GRB 020604, optical observations
  29. GRB 020531/Candidate Redshift
  30. GRB020531: Detection of Candidate Host Galaxy
  31. GRB020531: Second epoch Chandra observations
  32. GRB020604, optical observations
  33. GRB020604, BVRcIc field photometry
  34. GRB020603, BVRcIc field observations
  35. GRB020531, BVRcIc field photometry
  36. GRB020531 Optical observations with TAROT
  37. GRB020531 Optical observations with TAROT
  38. GRB 020531, Radio Observations
  39. GRB020531 Optical Observations
  40. GRB 020603: Optical Observations
  41. GRB 020603, R-band observation
  42. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  43. GRB020531: Upper Limit for Detection of Two TAROT Sources
  44. GRB 020603: Optical observations
  45. GRB 020531 optical observations with TAROT
  46. Refined IPN error box for GRB020531
  47. GRB020531, optical observations
  48. GRB020531: optical observations
  49. GRB020531(=H2042): Optical Observations
  50. IPN triangulation of the short, hard GRB020531 (=H2042)
  51. GRB020531(=H2042): Optical Observations
  52. GRB020531: Optical observations
  53. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  54. GRB 020525: Optical Observations
  55. GRB020525, optical observations
  56. IPN detection of possible bursts from SGR1806-20
  57. XRF 020427: Sudden Ionospheric Disturbance (SID)
  58. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  59. GRB/XRF 020427, Radio Observations
  60. HST detection of the likely host galaxy of GRB 020124
  61. GRB020405 field photometry at ESO
  62. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  63. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  64. GRB020321 : Optical observations.
  65. GRB020331: Third Epoch and Revised Second Epoch Optical
  66. GRB 020410, Radio Observations
  67. GRB 020418: Optical observations
  68. GRB 020124: Optical observations
  69. GRB 020418: Optical observations
  70. GRB020405: VLT observations of the OT environment
  71. GRB020410: BeppoSAX NFI observations refined analysis
  72. GRB 020409: Optical Observations
  73. Mars Odyssey joins the IPN
  74. GRB 020409, 2-nd epoch optical observations at Terskol.
  75. GRB020405: predicted break
  76. GRB 020409: Optical observations
  77. GRB 020409, No Optical Detection to R = 22
  78. GRB 020409: No Evidence for an Optical Afterglow
  79. GRB 020409, 2nd epoch optical observations
  80. GRB 020331 Kyoto observation on March 31
  81. GRB 020409, No Optical Detection to R = 20
  82. GRB 020409: Optical observations
  83. GRB 020410, optical observations
  84. GRB 020409, optical observations
  85. GRB 020409: Optical Observations
  86. GRB020406(?), optical observations
  87. X-ray afterglow of GRB020321
  88. GRB020331: Confirmation of Afterglow Candidate with Magellan
  89. GRB020405: VLT optical observations and V band decay slope
  90. GRB020331 optical observations with RIMOTS
  91. GRB020124 optical observations with RIBOTS/RIMOTS
  92. GRB 020321: Candidate X-ray Counterparts
  93. ASM GRB candidate 020406 refined error box
  94. GRB 020405: Moderate-resolution spectroscopy
  95. GRB020331: Optical Observations of Afterglow Candidate
  96. GRB020406(?), optical observations
  97. GRB020405: VLT optical observations
  98. Revised Photometry of the Optical Afterglow of GRB 020405
  99. GRB020405: OT observations
  100. GRB 020331: Candidate Optical Afterglow

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