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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"

27395 results found.

  1. GRB020812: negative optical observations
  2. GRB 020812: optical observation at Kyoto University
  3. Second epoch K band imaging of GRB 020819
  4. GRB 020813 : HST observations
  5. GRB 020812: early time optical observation at Ouda Station
  6. GRB020813: Magellan BVRI Photometry
  7. GRB 020819: Optical observations
  8. K band observation of GRB 020819
  9. GRB020813: optical and NIR observations
  10. GRB020813: Fading X-ray Afterglow Observed with Chandra
  11. GRB020813, UBVRI field calibration
  12. GRB020812: NIR observations
  13. Polarimetry of GRB020813: evidence for variability
  14. GRB020813 IRAM millimeter observations
  15. GRB020812: optical observations
  16. GRB020813: High-Resolution Optical Observations
  17. GRB 020812: optical observation at Bisei
  18. GRB020813: Early Time Magnitude
  19. Millimeter observation of GRB 020813
  20. GRB020812: optical observations
  21. GRB 020813 : KISO multiband optical observations
  22. GRB020813, optical observations
  23. IPN error box for GRB020813
  24. GRB020813, astrometric position
  25. Spectropolarimetry of GRB 020813
  26. GRB 020812 optical observation
  27. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  28. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  29. HST Imaging of the Host of GRB 011121
  30. GRB020801, optical afterglow candidate
  31. GRB020331: Late-time Optical Light Curve (re-submission)
  32. GRB020331: Late-time Optical Light Curve
  33. IPN triangulation of GRB020714
  34. IPN triangulation of GRB020715 (=GRB150702)
  35. IPN triangulation of GRB020714
  36. IPN triangulation of GRB150702
  37. GRB 020410: Discovery of Probable OT by HST
  38. GRB 020124, HST observations of the fading afterglow
  39. IPN triangulation of GRB020708
  40. IPN triangulation of GRB020708
  41. Correction to IPN error box for GRB020706
  42. IPN triangulation of GRB020706
  43. GRB 020705: Optical observations
  44. GRB 020625, optical observations
  45. GRB 020625: Optical observations
  46. GRB 020531: optical photometry of Chandra sources
  47. GRB020625 (=H2081): A Long Burst Localized by HETE
  48. The Probable Host Galaxy of GRB/XRF 020427
  49. GRB/XRF 020427, detection of an underlying system with the VLT
  50. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  51. AXP 1E2259+586 optical observations
  52. Fading Optical Source in the Field of GRB020531
  53. GRB 020531, INT+WFC deep optical upper limits
  54. SGR-like Bursts from the AXP 1E 2259+586
  55. GRB020405: polarimetric observations
  56. GRB 020531, simultaneous optical observations
  57. GRB 020531/Candidate Redshift
  58. GRB020531: Detection of Candidate Host Galaxy
  59. GRB020531: Second epoch Chandra observations
  60. GRB020604, optical observations
  61. GRB020604, BVRcIc field photometry
  62. GRB020603, BVRcIc field observations
  63. GRB020531, BVRcIc field photometry
  64. GRB020531 Optical Observations
  65. GRB020531: Observations with the Chandra X-ray Observatory
  66. GRB020531, optical observations
  67. GRB020531: optical observations
  68. GRB020531(=H2042): Optical Observations
  69. GRB020531(=H2042): Optical Observations
  70. GRB020531: Optical observations
  71. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  72. GRB020525, optical observations
  73. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  74. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  75. HST detection of the likely host galaxy of GRB 020124
  76. GRB020405 field photometry at ESO
  77. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  78. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  79. GRB020321 : Optical observations.
  80. XRF 020427
  81. GRB 020124: Optical observations
  82. IPN triangulation of GRB020418
  83. GRB020405: VLT observations of the OT environment
  84. IPN triangulation of GRB020413
  85. GRB020405: predicted break
  86. GRB 020409: No Evidence for an Optical Afterglow
  87. GRB 020331 Kyoto observation on March 31
  88. GRB020410: BeppoSAX NFI observation
  89. X-ray afterglow of GRB020321
  90. GRB020331 optical observations with RIMOTS
  91. GRB020124 optical observations with RIBOTS/RIMOTS
  92. GRB 020321: Candidate X-ray Counterparts
  93. GRB020406(?), optical observations
  94. GRB 020405: Decay index
  95. Short RXTE/ASM transient 020406; may be a GRB
  96. GRB020405, Radio Observations
  97. GRB 020405, U-band observations
  98. GRB011212: Optical Observations
  99. GRB 020331: NIR Observations
  100. GRB020331 NIR observation at KPNO (re-submission)

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