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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').
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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

42787 results found.

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

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