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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"

44425 results found.

  1. GRB 020531: optical photometry of Chandra sources
  2. GRB020625 (=H2081): A Long Burst Localized by HETE
  3. HETE #2081: Optical observations
  4. The Probable Host Galaxy of GRB/XRF 020427
  5. GRB/XRF 020427, detection of an underlying system with the VLT
  6. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  7. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  8. AXP 1E2259+586: quasi-simultaneous optical observation
  9. AXP 1E2259+586 optical observations
  10. Fading Optical Source in the Field of GRB020531
  11. GRB 020531, INT+WFC deep optical upper limits
  12. SGR-like Bursts from the AXP 1E 2259+586
  13. GRB020405: polarimetric observations
  14. GRB 020531, simultaneous optical observations
  15. GRB 020604, optical observations
  16. GRB 020531/Candidate Redshift
  17. GRB020531: Detection of Candidate Host Galaxy
  18. GRB020531: Second epoch Chandra observations
  19. GRB020604, optical observations
  20. GRB020604, BVRcIc field photometry
  21. GRB020603, BVRcIc field observations
  22. GRB020531, BVRcIc field photometry
  23. GRB020531 Optical observations with TAROT
  24. GRB020531 Optical observations with TAROT
  25. GRB 020418, optical/near-IR observations
  26. GRB 020531, Radio Observations
  27. IPN triangulation of GRB020604
  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. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  33. GRB020531: Upper Limit for Detection of Two TAROT Sources
  34. GRB 020603: Optical observations
  35. IPN triangulation of GRB020603 (possible short/hard GRB)
  36. GRB 020531 optical observations with TAROT
  37. Refined IPN error box for GRB020531
  38. GRB020531, optical observations
  39. GRB020531: optical observations
  40. GRB020531, optical observation
  41. GRB020531(=H2042): Optical Observations
  42. IPN triangulation of the short, hard GRB020531 (=H2042)
  43. GRB020531(=H2042): Optical Observations
  44. GRB020531: Optical observations
  45. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  46. GRB 020525: Optical Observations
  47. GRB020525, optical observations
  48. IPN detection of possible bursts from SGR1806-20
  49. IPN triangulation of GRB020525
  50. XRF 020427: Sudden Ionospheric Disturbance (SID)
  51. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  52. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  53. IPN triangulation of a burst from SGR1806-20
  54. GRB/XRF 020427, Radio Observations
  55. HST detection of the likely host galaxy of GRB 020124
  56. GRB020405 field photometry at ESO
  57. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  58. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  59. GRB020321 : Optical observations.
  60. GRB020427 BeppoSAX NFI Observation
  61. XRF 020427
  62. GRB020331: Third Epoch and Revised Second Epoch Optical
  63. The end of BSAX GRB activities
  64. GRB 020410, Radio Observations
  65. GRB 020418: Optical observations
  66. GRB 020124: Optical observations
  67. GRB 020418: Optical observations
  68. IPN triangulation of GRB020418
  69. GRB020405: VLT observations of the OT environment
  70. GRB020410: BeppoSAX NFI observations refined analysis
  71. GRB 020409: Optical Observations
  72. Mars Odyssey joins the IPN
  73. IPN triangulation of GRB020413
  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. GRB020410: second BeppoSAX NFI observation
  79. GRB 020409: No Evidence for an Optical Afterglow
  80. GRB 020409, 2nd epoch optical observations
  81. GRB 020331 Kyoto observation on March 31
  82. GRB 020409
  83. GRB 020409 SARA Observations
  84. GRB "020411"
  85. GRB 020409, No Optical Detection to R = 20
  86. GRB020410: BeppoSAX NFI observation
  87. GRB 020409: Optical observations
  88. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  89. GRB 020410, optical observations
  90. BeppoSAX ALERT: possible GRB020411
  91. GRB 020409, optical observations
  92. GRB 020409: Optical Observations
  93. GRB020406(?), optical observations
  94. GRB020410, optical observations
  95. BeppoSAX ALERT: possible GRB020410
  96. X-ray afterglow of GRB020321
  97. GRB020331: Confirmation of Afterglow Candidate with Magellan
  98. GRB020405: VLT optical observations and V band decay slope
  99. GRB020331 optical observations with RIMOTS
  100. GRB020124 optical observations with RIBOTS/RIMOTS

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