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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.

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

43604 results found.

  1. IPN triangulation of GRB021113 (=H2449; annulus)
  2. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  3. GRB 021113: Optical observations
  4. GRB 021112: RAPTOR Observations
  5. GRB 021113: Optical Observations
  6. GRB021113 (=H2449): A Long GRB Localized by HETE
  7. GRB 021112: R-band search
  8. IPN triangulation of GRB021108 (large error box)
  9. GRB021112 (=H2448): A Long GRB Localized by HETE
  10. IPN triangulation of GRB021109 (annulus)
  11. IPN triangulation of GRB021108 (annulus)
  12. GRB021004: Near infrared spectroscopy
  13. GRB021104: Optical Observations
  14. IPN triangulation of GRB021104 (annulus)
  15. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  16. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  17. SGR1900+14 activity, November 2-4, 2002
  18. Spectropolarimetry of GRB021004
  19. GRB021104: Optical observations
  20. GRB021104: optical observations
  21. GRB021104: Candidate present in DSS
  22. GRB021104: possible optical afterglow
  23. IPN triangulation of GRB021102 (annulus)
  24. Detection of activity from SGR 1900+14 with the RXTE/PCA
  25. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  26. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  27. IPN triangulation of GRB021025 (portion of annulus)
  28. IPN triangulation of GRB021027 (single large error box)
  29. GRB021004, late-time optical observations
  30. IPN triangulation of GRB021027 (two large error boxes)
  31. GRB 021023: Infrared Imaging
  32. IPN triangulation of GRB021027 (annulus)
  33. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  34. IPN triangulation of GRB021025 (annulus)
  35. IPN triangulation of SGR1900+14, October 22 2002
  36. GRB 021004: optical observations
  37. IPN triangulation of GRB021023 (small error boc)
  38. GRB 020813; likely host galaxy.
  39. IPN triangulation of GRB021020 (smaller error box)
  40. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  41. IPN triangulation of GRB021020
  42. GRB 021008, radio observations
  43. GRB 021004: VRI observations at TNG: possible break
  44. GRB021016, optical observations
  45. SGR1900+14: burst on October 10 2002
  46. GRB 021008, optical observations
  47. GRB021016(=H2397): A Long GRB Localized by HETE
  48. IPN triangulation of GRB021016 (small error box)
  49. GRB021004: Optical Observations
  50. IPN triangulation of GRB021014 (large error box)
  51. IPN triangulation of GRB021013 (single error box)
  52. GRB 021004: optical spectroscopy on Oct 11
  53. IPN triangulation of GRB021013 (two small error boxes)
  54. GRB021004: High-resolution optical spectroscopy
  55. IPN triangulation of GRB021013 (annulus)
  56. XRF 020903: flattening of the optical light curve.
  57. GRB021004, UBVRcIc field photometry update
  58. IPN triangulation of GRB021008 (single error box)
  59. GRB021004: Optical Observations
  60. GRB 021004 submm observations
  61. IPN triangulation of GRB021008B (annulus)
  62. IPN triangulation of GRB021008 (two small error boxes)
  63. GRB021004 Chandra HETG Observations
  64. GRB 021004: Optical/NIR Observations
  65. GRB 021004: Additional V-band Polarimetric Observations
  66. GRB021004: optical observation
  67. GRB 021004: Host Galaxy Star Formation Rate
  68. GRB 021004 submm observations
  69. GRB 021004: WC wind?
  70. IPN triangulation of GRB021008
  71. GRB021004: NIR and Optical observations
  72. GRB 021004: Optical measurement at OHP
  73. GRB 021004: Optical observations, AUDE network
  74. GRB 021004 - VLA Radio Observations
  75. GRB 021004 - Unusual Radio-to-Submm Spectrum
  76. GRB 021004: optical spectroscopy
  77. IPN triangulation of GRB021007 (annulus)
  78. XRF 020903 spectrum
  79. GRB 021004: HST/STIS spectroscopic observations
  80. GRB021004: optical observations and predicted break time
  81. GRB021004: BVRc photometry
  82. GRB 021004 redshift
  83. GRB021004 radio observation
  84. GRB021004: restart of optical decay
  85. GRB 021004 continued IR fading
  86. HETE fluences for GRB021004
  87. GRB 021004, spectroscopic observations
  88. GRB021004: not fading anymore?
  89. GRB 021004: Optical Photometry at 2.5 Days
  90. GRB 021004: polarimetric observations
  91. GRB 021004: V-band Polarimetric Observations
  92. GRB021004: Update Bisei photometric data
  93. GRB 021004: Optical Decay
  94. GRB021004, astrometric position
  95. GRB021004, Optical Observations
  96. IRAM Millimeter detection of GRB 021004
  97. GRB 021004: Optical observations at RIKEN
  98. GRB 021004 radio observation
  99. GRB 021004: Optical Observations
  100. GRB021004: continued fading

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