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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

41192 results found.

  1. GRB 020625, optical observations
  2. GRB 020625: Optical observations
  3. GRB 020531: optical photometry of Chandra sources
  4. GRB020625 (=H2081): A Long Burst Localized by HETE
  5. HETE #2081: Optical observations
  6. The Probable Host Galaxy of GRB/XRF 020427
  7. GRB/XRF 020427, detection of an underlying system with the VLT
  8. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  9. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  10. AXP 1E2259+586: quasi-simultaneous optical observation
  11. AXP 1E2259+586 optical observations
  12. Fading Optical Source in the Field of GRB020531
  13. GRB 020531, INT+WFC deep optical upper limits
  14. GRB020405: polarimetric observations
  15. GRB 020531, simultaneous optical observations
  16. GRB 020604, optical observations
  17. GRB 020531/Candidate Redshift
  18. GRB020531: Detection of Candidate Host Galaxy
  19. GRB020531: Second epoch Chandra observations
  20. GRB020604, optical observations
  21. GRB020604, BVRcIc field photometry
  22. GRB020603, BVRcIc field observations
  23. GRB020531, BVRcIc field photometry
  24. GRB020531 Optical observations with TAROT
  25. GRB020531 Optical observations with TAROT
  26. GRB 020418, optical/near-IR observations
  27. GRB 020531, Radio Observations
  28. GRB020531 Optical Observations
  29. GRB020531: Observations with the Chandra X-ray Observatory
  30. GRB 020603: Optical Observations
  31. GRB 020603, R-band observation
  32. GRB020531: Upper Limit for Detection of Two TAROT Sources
  33. GRB 020603: Optical observations
  34. GRB 020531 optical observations with TAROT
  35. Refined IPN error box for GRB020531
  36. GRB020531, optical observations
  37. GRB020531: optical observations
  38. GRB020531, optical observation
  39. GRB020531(=H2042): Optical Observations
  40. IPN triangulation of the short, hard GRB020531 (=H2042)
  41. GRB020531(=H2042): Optical Observations
  42. GRB020531: Optical observations
  43. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  44. GRB 020525: Optical Observations
  45. GRB020525, optical observations
  46. IPN detection of possible bursts from SGR1806-20
  47. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  48. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  49. IPN triangulation of a burst from SGR1806-20
  50. GRB/XRF 020427, Radio Observations
  51. HST detection of the likely host galaxy of GRB 020124
  52. GRB020405 field photometry at ESO
  53. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  54. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  55. GRB020321 : Optical observations.
  56. XRF 020427
  57. GRB020331: Third Epoch and Revised Second Epoch Optical
  58. The end of BSAX GRB activities
  59. GRB 020410, Radio Observations
  60. GRB 020418: Optical observations
  61. GRB 020124: Optical observations
  62. GRB 020418: Optical observations
  63. IPN triangulation of GRB020418
  64. GRB020405: VLT observations of the OT environment
  65. GRB020410: BeppoSAX NFI observations refined analysis
  66. GRB 020409: Optical Observations
  67. Mars Odyssey joins the IPN
  68. IPN triangulation of GRB020413
  69. GRB 020409, 2-nd epoch optical observations at Terskol.
  70. GRB020405: predicted break
  71. GRB 020409: Optical observations
  72. GRB 020409, No Optical Detection to R = 22
  73. GRB020410: second BeppoSAX NFI observation
  74. GRB 020409: No Evidence for an Optical Afterglow
  75. GRB 020409, 2nd epoch optical observations
  76. GRB 020331 Kyoto observation on March 31
  77. GRB 020409
  78. GRB 020409 SARA Observations
  79. GRB "020411"
  80. GRB 020409, No Optical Detection to R = 20
  81. GRB 020409: Optical observations
  82. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  83. GRB 020410, optical observations
  84. GRB 020409, optical observations
  85. GRB 020409: Optical Observations
  86. GRB020406(?), optical observations
  87. GRB020410, optical observations
  88. X-ray afterglow of GRB020321
  89. BeppoSAX GRB : GRB020409
  90. GRB020331: Confirmation of Afterglow Candidate with Magellan
  91. GRB020405: VLT optical observations and V band decay slope
  92. GRB020331 optical observations with RIMOTS
  93. GRB020124 optical observations with RIBOTS/RIMOTS
  94. GRB 020321: Candidate X-ray Counterparts
  95. ASM GRB candidate 020406 refined error box
  96. GRB 020405: Moderate-resolution spectroscopy
  97. GRB020331: Optical Observations of Afterglow Candidate
  98. GRB020406(?), optical observations
  99. GRB020405: VLT optical observations
  100. Revised Photometry of the Optical Afterglow of GRB 020405

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