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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"

23582 results found.

  1. GRB 021004: Optical observations
  2. GRB 021004: optical counterpart
  3. GRB021004: Optical Spectroscopy
  4. GRB 021004: steepening of the optical decay slope
  5. GRB021004: Upper limits from recent and historical observations
  6. XRF020903, BVRI field photometry
  7. GRB021004: optical observations at Nyrola
  8. GRB021004(=H2380): Revised Localization with HETE Soft X-ray
  9. GRB021004: optical observations at Bisei
  10. GRB 021004: Kyoto observation
  11. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  12. XRF020903: TNG and Asiago photometry
  13. GRB 020903: Optical observations at RIKEN
  14. XRF 020903: Correction to GCN 1560
  15. XRF 020903: VRI observations
  16. IPN triangulation of GRB020926 (single large error box)
  17. GRB 020903: correction to GCN 1557
  18. XRF 020903: R band observations
  19. XRF 020903: Supernova
  20. IPN triangulation of GRB020926 (two large error boxes)
  21. IPN triangulation of GRB020923 (two error boxes)
  22. IPN annulus for GRB020923
  23. IPN triangulation of GRB020914B
  24. IPN triangulation of GRB020911 (2 large error boxes)
  25. Confirmation of IPN error box for GRB020910
  26. IPN triangulation of GRB020910
  27. Single IPN error box for GRB020904
  28. XRF 020903: optical observation at Kyoto
  29. XRF 020903: Optical observations
  30. IPN triangulation of GRB020904
  31. IPN detection of a burst from SGR1900+14
  32. XRF 020903, optical observations
  33. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  34. INTEGRAL GRBs added to GCN
  35. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  36. SGR1900+14 burst localized by HETE
  37. GRB020813: High-resolution optical spectroscopy
  38. GRB020819: optical observations at Bisei
  39. GRB 020812: optical observation at Kyoto University
  40. Second epoch K band imaging of GRB 020819
  41. K band observation of GRB 020819
  42. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  43. IPN triangulation of GRB020819 (HETE 2275)
  44. GRB020813: optical and NIR observations
  45. GRB020813: Fading X-ray Afterglow Observed with Chandra
  46. GRB020813, UBVRI field calibration
  47. GRB 020813: addendum to GCN 1498
  48. GRB020813: optical observations at Bisei
  49. GRB020813: V-band decay slope
  50. Polarimetry of GRB020813: evidence for variability
  51. GRB020813 IRAM millimeter observations
  52. GRB020813(=H2262): Revised Localization with HETE SXC
  53. GRB 020812: optical observation at Bisei
  54. GRB020813: optical observations; possible host galaxy
  55. GRB 020812 : optical afterglow candidate
  56. GRB 020813 : KISO multiband optical observations
  57. GRB020813, optical observations
  58. IPN error box for GRB020813
  59. IPN triangulation of GRB020813
  60. GRB020812: possible afterglow candidate
  61. GRB020812: possible afterglow candidate
  62. Spectropolarimetry of GRB 020813
  63. GRB 020813 Afterglow Observations; Possible break
  64. GRB020813: optical afterglow
  65. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  66. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  67. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  68. Further refinement to IPN error box for GRB020531
  69. GRB020331: Late-time Optical Light Curve (re-submission)
  70. GRB020331: Late-time Optical Light Curve
  71. IPN triangulation of GRB020714
  72. IPN triangulation of GRB020715 (=GRB150702)
  73. IPN triangulation of GRB020714
  74. IPN triangulation of GRB150702
  75. GRB 020410: Discovery of Probable OT by HST
  76. IPN triangulation of GRB020708
  77. IPN triangulation of GRB020708
  78. Correction to IPN error box for GRB020706
  79. IPN triangulation of GRB020706
  80. GRB 020625, optical observations
  81. GRB 020625: Optical observations
  82. GRB020625 (=H2081): A Long Burst Localized by HETE
  83. GRB/XRF 020427, detection of an underlying system with the VLT
  84. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  85. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  86. AXP 1E2259+586: quasi-simultaneous optical observation
  87. AXP 1E2259+586 optical observations
  88. SGR-like Bursts from the AXP 1E 2259+586
  89. GRB020405: polarimetric observations
  90. GRB 020531, simultaneous optical observations
  91. GRB 020604, optical observations
  92. GRB 020531/Candidate Redshift
  93. GRB020531: Second epoch Chandra observations
  94. GRB020604, optical observations
  95. GRB020604, BVRcIc field photometry
  96. GRB020603, BVRcIc field observations
  97. GRB020531, BVRcIc field photometry
  98. GRB020531 Optical observations with TAROT
  99. GRB020531 Optical observations with TAROT
  100. GRB 020418, optical/near-IR observations

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