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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

23687 results found.

  1. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  2. IPN/HETE summary of recent bursts from SGR1806-20
  3. XRF 030723: Detection of a rebrightening in the optical afterglow
  4. IPN triangulation of GRB030801 (large error box)
  5. GRB021206 optical counterpart upper limit
  6. IPN triangulation of GRB030725 (=H2779; small error box)
  7. GRB 030725: optical observations.
  8. IPN triangulation of GRB030726 (large error box)
  9. IPN triangulation of GRB030721 (large error box)
  10. XRF030723 Radio Observations
  11. XRF 030723: VLT spectra
  12. Magellan Observations of XRF030723 (=H2777)
  13. GRB030723: Upper limits from historical observations
  14. GRB030725 (=H2779): A Bright GRB Localized by HETE
  15. XRF030723: optical observations
  16. XRF030723, ROTSE-III Early Observations
  17. XRF030723, BVRcIc field photometry
  18. XRF 030723, optical observations
  19. XRF030723, optical observations
  20. XRF 030723, optical observations
  21. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  22. Konus-Wind detection of the bursts from SGR1806-20 region
  23. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  24. Triangulation of GRB030715 (single large error box)
  25. Triangulation of GRB030714 (single large error box)
  26. IPN triangulation of GRB030714 (two large error boxes)
  27. IPN triangulation of GRB030715 (two large error boxes)
  28. GRB030329: RTT150 optical observations
  29. GRBlog: Compilation of all GCN Circ. data
  30. IPN detection of renewed activity from SGR1806-20
  31. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  32. IPN triangulation of GRB030626 (single large error box)
  33. IPN triangulation of GRB030626 (two large error boxes)
  34. HETE detection of burst from SGR1806-20
  35. GRB030329 -- RATAN-600 data in April-May
  36. Final IPN error ellipse for GRB021206 (the polarized GRB)
  37. IPN triangulation of GRB030606 (two alternate error boxes)
  38. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  39. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  40. GRB030528, BVRI field photometry
  41. GRB030329, SPM optical observations
  42. GRB 030519B: optical observations.
  43. GRB030528(=H2724): Revised SXC Localization
  44. GRB 030329: optical observations
  45. GRB 030329/SN 2003dh: Jitter Episode
  46. GRB 030528, Teramo optical observation
  47. GRB 030528 Bisei optical observation
  48. GRB030528 (H2724): A long GRB localized by HETE
  49. GRB 030329: Correction to GCN 2254
  50. GRB 030329: Optical Observations
  51. GRB 030528: Optical observations at RIKEN
  52. GRB 030528 (=H2724) Kyoto optical observation
  53. IPN triangulation of GRB030523B (annulus)
  54. GRB 030416: Optical Observations
  55. GRB 030329: optical photometry at various french observatories
  56. GRB 030329: optical photometry at Belesta observatory (France)
  57. GRB030329, Optical observations
  58. GRB 030329/SN 2003dh: Possible increase in brightness
  59. GRB 030329 Optical Observations
  60. GRB030324: Further Observations of the Candidate Optical Afterglow
  61. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  62. IPN triangulation of GRB030519B=H2716 (small error box)
  63. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  64. IPN triangulation of GRB030519 (annulus)
  65. IPN triangulation of GRB030518C (annulus)
  66. IPN triangulation of GRB030518A (annulus)
  67. IPN triangulation of GRB030509 (small errror box)
  68. IPN triangulation of GRB030509 - correction
  69. IPN triangulation of GRB030509 (single error box)
  70. GRB030329: RTT150 optical observations
  71. GRB 030329: Optical limit (contemporaneous photography)
  72. GRB030418, BVRcIc field photometry
  73. GRB030429, BVRcIc field photometry
  74. GRB030429: RTT150 optical obs., correction to GCN 2208
  75. GRB 030329: High-Resolution Spectroscopy of the Host
  76. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  77. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  78. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  79. GRB030429: RTT150 optical observations, a possible host galaxy
  80. IPN triangulation of GRB030505B (large error box)
  81. GRB030329: RTT150 optical observations and upper limit for a host
  82. GRB030329: RTT150 optical observations and upper limit for a host
  83. GRB 030329 Optical Observations
  84. IPN triangulation of GRB030425 (single error box)
  85. GRB030329, SPM optical observations
  86. GRB 030329, the review of the sky area in plate archive (1950-1998)
  87. GRB 030329: Spectral Evolution of SN 2003dh
  88. GRB 030329: optical spectropolarimetry at VLT
  89. IPN triangulation of GRB030422B (annulus)
  90. IPN triangulation of GRB030422 (two large error boxes)
  91. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  92. GRB030329, optical observation
  93. GRB030418: Upper limits from recent and historical observations.
  94. GRB030418: Kiso near infrared observations
  95. GRB 030329 OT position
  96. OT GRB 030329: early UBVRcIc spectral evolution
  97. GRB 030329: SARA Optical Observations
  98. OT GRB 030329: early spectrum
  99. GRB030329: VR Photometry at TNG
  100. GRB030324: Candidate Optical Afterglow (Erratum)

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