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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.

Advanced Search Examples (click to copy):

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

26301 results found.

  1. IPN triangulation of GRB030721 (large error box)
  2. XRF030723 Radio Observations
  3. XRF 030723: confirmation of fading optical counterpart
  4. XRF030723(=H2777): Chandra Observations
  5. Magellan Observations of XRF030723 (=H2777)
  6. GRB030723: Upper limits from historical observations
  7. GRB030725 (=H2779): A Bright GRB Localized by HETE
  8. XRF030723: optical observations
  9. XRF030723, ROTSE-III Early Observations
  10. XRF 030723, optical observations
  11. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  12. Konus-Wind detection of the bursts from SGR1806-20 region
  13. SGR 1806-20, submm observations
  14. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  15. IPN triangulation of GRB030717 (annulus)
  16. RXTE PCA Observations of SGR1806-20 Region
  17. IPN triangulation of GRB030714 (two large error boxes)
  18. IPN triangulation of GRB030715 (two large error boxes)
  19. GRB030329: RTT150 optical observations
  20. GRBlog: Compilation of all GCN Circ. data
  21. IPN detection of renewed activity from SGR1806-20
  22. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  23. IPN triangulation of GRB030710 (annulus)
  24. IPN triangulation of GRB030709 (annulus)
  25. GRB030706 triangulation (single large error box)
  26. IPN triangulation of GRB030706 (annulus)
  27. IPN triangulation of GRB030629 (annulus)
  28. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  29. GRB030329, optical observation in May
  30. IPN triangulation of GRB030626 (two large error boxes)
  31. GRB030329: second XMM-Newton observation
  32. GRB030418: R optical observations
  33. GRB 021206, Radio afterglow candidate
  34. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  35. IPN triangulation of GRB030607 (annulus)
  36. IPN triangulation of GRB030606 (two alternate error boxes)
  37. IPN triangulation of GRB030605B (annulus)
  38. GRB 030528: Optical Observations
  39. IPN triangulation of GRB030605 (annulus)
  40. GRB 030528: tentative NIR counterpart
  41. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  42. IPN triangulation of GRB030601 (annulus)
  43. GRB030329, SPM optical observations
  44. GRB030528: Chandra TOO Planned
  45. GRB030528(=H2724): Revised SXC Localization
  46. GRB 030329: optical observations
  47. GRB 030329/SN 2003dh: Jitter Episode
  48. GRB030528 (H2724): A long GRB localized by HETE
  49. GRB 030528: Optical observations at RIKEN
  50. IPN triangulation of GRB030523B (annulus)
  51. IPN triangulation of GRB030523 (annulus)
  52. GRB 030329: optical photometry at various french observatories
  53. GRB 030329: optical photometry at Belesta observatory (France)
  54. GRB030329, Optical observations
  55. GRB 030329: HST ACS Observations of the Host
  56. GRB030329: XMM-Newton observation
  57. GRB030324: Further Observations of the Candidate Optical Afterglow
  58. IPN triangulation of GRB030519B=H2716 (small error box)
  59. GRB 030418: Second Epoch Optical Observations with Magellan
  60. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  61. IPN triangulation of GRB030519 (annulus)
  62. IPN triangulation of GRB030518C (annulus)
  63. IPN triangulation of GRB030518B (annulus)
  64. IPN triangulation of GRB030518A (annulus)
  65. IPN triangulation of GRB030514 (annulus)
  66. HETE GRB030329, correction to Rc Observations in Loiano
  67. IPN triangulation of GRB030513 (annulus)
  68. IPN triangulation of GRB030509B (annulus)
  69. GRB 030329: Optical limit (contemporaneous imaging)
  70. GRB 030501: final TAROT limits
  71. IPN triangulation of GRB030509 - correction
  72. IPN triangulation of GRB030509 (single error box)
  73. GRB030329: RTT150 optical observations
  74. GRB030329, BVRI photometry
  75. GRB030429, refiend optical brightness
  76. GRB 030329: Optical limit (contemporaneous photography)
  77. GRB 030329: High-Resolution Spectroscopy of the Host
  78. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  79. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  80. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  81. GRB030429: RTT150 optical observations, a possible host galaxy
  82. IPN triangulation of GRB030506 (annulus)
  83. IPN triangulation of GRB030505B (large error box)
  84. IPN triangulation of GRB030505A (annulus)
  85. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  86. GRB030501C triangulation (annulus)
  87. GRB030501 triangulation (correction to GCN 2194)
  88. GRB030329: RTT150 optical observations and upper limit for a host
  89. GRB 030429: Radio Observations
  90. GRB 030429: IR photometry with IRSF/SIRIUS
  91. GRB030501B triangulation (single error box)
  92. GRB030328, optical observation
  93. GRB 030329, BVRI photometry
  94. GRB030429: Optical Observations
  95. GRB 030501: TAROT possible candidate counterpart
  96. IPN triangulation of GRB030501 (IBIS event; annulus)
  97. IPN triangulation of GRB030501B (annulus)
  98. GRB 030429: confirmation of afterglow candidate
  99. GRB030429, possible optical counterpart
  100. GRB030501 localized by INTEGRAL

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