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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"

42281 results found.

  1. XRF030723, optical observations
  2. XRF 030723, optical observations
  3. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  4. GRB030723, optical observations
  5. Konus-Wind detection of the bursts from SGR1806-20 region
  6. SGR 1806-20, submm observations
  7. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  8. RXTE PCA Observations of SGR1806-20 Region
  9. GRB030329: Subaru Optical Spectroscopy
  10. Triangulation of GRB030715 (single large error box)
  11. Triangulation of GRB030714 (single large error box)
  12. IPN triangulation of GRB030714 (two large error boxes)
  13. IPN triangulation of GRB030715 (two large error boxes)
  14. GRB030329: RTT150 optical observations
  15. GRBlog: Compilation of all GCN Circ. data
  16. IPN detection of renewed activity from SGR1806-20
  17. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  18. GRB030329, optical observation in May
  19. IPN triangulation of GRB030626 (two large error boxes)
  20. GRB030329: second XMM-Newton observation
  21. GRB030418: R optical observations
  22. HETE detection of burst from SGR1806-20
  23. GRB030329 -- RATAN-600 data in April-May
  24. Final IPN error ellipse for GRB021206 (the polarized GRB)
  25. GRB 021206, Radio afterglow candidate
  26. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  27. IPN triangulation of GRB030607 (annulus)
  28. IPN triangulation of GRB030606 (two alternate error boxes)
  29. GRB030329, SPM optical observations (Correction of GCN2075 R band)
  30. GRB 030528: Optical Observations
  31. GRB 030528: tentative NIR counterpart
  32. GRB 030528, radio observations
  33. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  34. GRB030329, further radio observations at GMRT
  35. GRB030528, BVRI field photometry
  36. GRB030329, SPM optical observations
  37. GRB030528: Chandra TOO Planned
  38. GRB 030519B: optical observations.
  39. MASTER: optical observation GRB030601
  40. GRB030528(=H2724): Revised SXC Localization
  41. GRB 030329: optical observations
  42. GRB 030329/SN 2003dh: Jitter Episode
  43. GRB 030528, Teramo optical observation
  44. GRB 030528 Bisei optical observation
  45. GRB030528 (H2724): A long GRB localized by HETE
  46. GRB 030329: Correction to GCN 2254
  47. GRB 030329: Optical Observations
  48. GRB 030528: Optical observations at RIKEN
  49. GRB 030528 (=H2724) Kyoto optical observation
  50. IPN triangulation of GRB030523B (annulus)
  51. GRB 030416: Optical Observations
  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/SN 2003dh: Possible increase in brightness
  56. GRB 030329: HST ACS Observations of the Host
  57. GRB 030329 Optical Observations
  58. GRB030329: XMM-Newton observation
  59. GRB 021004: HST observations
  60. GRB030324: Further Observations of the Candidate Optical Afterglow
  61. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  62. GRB 030418: Second Epoch Optical Observations with Magellan
  63. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  64. IPN triangulation of GRB030518B (annulus)
  65. GRB 030329: Optical limit (contemporaneous imaging)
  66. IPN triangulation of GRB030509 (small errror box)
  67. GRB030329: RTT150 optical observations
  68. GRB030329, BVRI photometry
  69. GRB030429, refiend optical brightness
  70. GRB 030329: Optical limit (contemporaneous photography)
  71. GRB030418, BVRcIc field photometry
  72. GRB 030429: Redshift of neighbor galaxy
  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. GRB030329: RTT150 optical observations and upper limit for a host
  81. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  82. GRB030501, optical observation
  83. GRB030501 observation report
  84. GRB030329: RTT150 optical observations and upper limit for a host
  85. GRB 030429: Radio Observations
  86. GRB 030429: redshift from VLT spectroscopy
  87. GRB 030429: IR photometry with IRSF/SIRIUS
  88. GRB 030329 Optical Observations
  89. GRB030328, optical observation
  90. GRB030429: Optical Observations
  91. GRB030501: TAROT candidate afterglow present in archival images
  92. GRB 030501: TAROT possible candidate counterpart
  93. IPN triangulation of GRB030501 (IBIS event; annulus)
  94. GRB 030429: confirmation of afterglow candidate
  95. GRB030429, possible optical counterpart
  96. GRB030501 localized by INTEGRAL
  97. GRB030425: CrAO optical observation
  98. GRB 030329 Oprical observations in Rozhen observatory
  99. GRB 030324: Radio Observations
  100. GRB030329 observed as a sudden ionospheric disturbance (SID)

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