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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. GRB030725: Optical observations
  2. XRF030723, BVRcIc field photometry update
  3. IPN triangulation of GRB030801 (large error box)
  4. GRB021206 optical counterpart upper limit
  5. IPN triangulation of GRB030731 (annulus)
  6. IBAS GRB Alerts 1011-1017 NOT CONFIRMED
  7. XRF030723: Re-analysis of ROTSE-III early images
  8. IPN triangulation of GRB030725 (=H2779; small error box)
  9. XRF030723 (=H2777): Second Epoch Magellan Observations
  10. GRB 030725: optical observations.
  11. GRB030725, optical transient observations
  12. IPN triangulation of GRB030726 (large error box)
  13. IPN triangulation of GRB030722 (large error box)
  14. IPN triangulation of GRB030721 (large error box)
  15. XRF030723 Radio Observations
  16. XRF 030723: confirmation of fading optical counterpart
  17. XRF030723(=H2777): Chandra Observations
  18. XRF 030723: VLT spectra
  19. Magellan Observations of XRF030723 (=H2777)
  20. GRB030723: Upper limits from historical observations
  21. GRB030725, possible optical transient
  22. XRF030723: Palomar observations and proposed counterpart
  23. GRB030725 (=H2779): A Bright GRB Localized by HETE
  24. XRF030723: optical observations
  25. XRF030723 (= H2777): Chandra Observations Scheduled
  26. XRF030723, BVRcIc field photometry correction
  27. XRF030723, ROTSE-III Early Observations
  28. XRF030723, BVRcIc field photometry
  29. XRF030723, optical observations
  30. XRF 030723, optical observations
  31. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  32. GRB030723, optical observations
  33. Konus-Wind detection of the bursts from SGR1806-20 region
  34. IBAS GRB Alerts 969 970
  35. SGR 1806-20, submm observations
  36. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  37. IPN triangulation of GRB030717 (annulus)
  38. RXTE PCA Observations of SGR1806-20 Region
  39. 030716 NOT a GRB
  40. IPN triangulation of GRB030714 (two large error boxes)
  41. IPN triangulation of GRB030715 (two large error boxes)
  42. GRB030329: RTT150 optical observations
  43. GRBlog: Compilation of all GCN Circ. data
  44. IPN detection of renewed activity from SGR1806-20
  45. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  46. IPN triangulation of GRB030710 (annulus)
  47. IPN triangulation of GRB030709 (annulus)
  48. GRB030706 triangulation (single large error box)
  49. IPN triangulation of GRB030706 (annulus)
  50. IPN triangulation of GRB030629 (annulus)
  51. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  52. 030629 NOT a real GRB
  53. GRB030329, optical observation in May
  54. IPN triangulation of GRB030626 (single large error box)
  55. IPN triangulation of GRB030626 (two large error boxes)
  56. GRB030329: second XMM-Newton observation
  57. GRB030418: R optical observations
  58. HETE detection of burst from SGR1806-20
  59. GRB030329 -- RATAN-600 data in April-May
  60. Final IPN error ellipse for GRB021206 (the polarized GRB)
  61. GRB 021206, Radio afterglow candidate
  62. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  63. IPN triangulation of GRB030607 (annulus)
  64. IPN triangulation of GRB030606 (two alternate error boxes)
  65. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  66. IPN triangulation of GRB030605B (annulus)
  67. GRB 030528: Optical Observations
  68. IPN triangulation of GRB030605 (annulus)
  69. GRB 030528: tentative NIR counterpart
  70. GRB 030528, radio observations
  71. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  72. GRB030329, further radio observations at GMRT
  73. GRB030528, BVRI field photometry
  74. IPN triangulation of GRB030601 (annulus)
  75. GRB030329, SPM optical observations
  76. GRB030528: Chandra TOO Planned
  77. GRB 030519B: optical observations.
  78. GRB030528(=H2724): Revised SXC Localization
  79. GRB 030329: optical observations
  80. GRB 030329/SN 2003dh: Jitter Episode
  81. GRB 030528, Teramo optical observation
  82. GRB 030528 Bisei optical observation
  83. GRB030528 (H2724): A long GRB localized by HETE
  84. GRB 030329: Correction to GCN 2254
  85. GRB 030329: Optical Observations
  86. GRB 030528: Optical observations at RIKEN
  87. GRB 030528 (=H2724) Kyoto optical observation
  88. IPN triangulation of GRB030523B (annulus)
  89. GRB 030416: Optical Observations
  90. GRB 030329: Planned XMM-Newton Observation
  91. IPN triangulation of GRB030523 (annulus)
  92. GRB 030329: optical photometry at various french observatories
  93. GRB 030329: optical photometry at Belesta observatory (France)
  94. GRB030329, Optical observations
  95. GRB 030329: HST ACS Observations of the Host
  96. GRB 030329 Optical Observations
  97. GRB030329: XMM-Newton observation
  98. GRB 021004: HST observations
  99. GRB030324: Further Observations of the Candidate Optical Afterglow
  100. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum

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