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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"

42291 results found.

  1. XRF 030723: VLT spectra
  2. Magellan Observations of XRF030723 (=H2777)
  3. GRB030723: Upper limits from historical observations
  4. GRB030725, possible optical transient
  5. XRF030723: Palomar observations and proposed counterpart
  6. GRB030725 (=H2779): A Bright GRB Localized by HETE
  7. XRF030723: optical observations
  8. XRF030723 (= H2777): Chandra Observations Scheduled
  9. XRF030723, BVRcIc field photometry
  10. XRF 030723, optical observations
  11. XRF030723, optical observations
  12. XRF 030723, optical observations
  13. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  14. GRB030723, optical observations
  15. Konus-Wind detection of the bursts from SGR1806-20 region
  16. SGR 1806-20, submm observations
  17. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  18. RXTE PCA Observations of SGR1806-20 Region
  19. GRB030329: Subaru Optical Spectroscopy
  20. Triangulation of GRB030715 (single large error box)
  21. Triangulation of GRB030714 (single large error box)
  22. IPN triangulation of GRB030714 (two large error boxes)
  23. IPN triangulation of GRB030715 (two large error boxes)
  24. GRB030329: RTT150 optical observations
  25. GRBlog: Compilation of all GCN Circ. data
  26. IPN detection of renewed activity from SGR1806-20
  27. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  28. GRB030329, optical observation in May
  29. IPN triangulation of GRB030626 (two large error boxes)
  30. GRB030329: second XMM-Newton observation
  31. GRB030418: R optical observations
  32. HETE detection of burst from SGR1806-20
  33. GRB030329 -- RATAN-600 data in April-May
  34. Final IPN error ellipse for GRB021206 (the polarized GRB)
  35. GRB 021206, Radio afterglow candidate
  36. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  37. IPN triangulation of GRB030607 (annulus)
  38. IPN triangulation of GRB030606 (two alternate error boxes)
  39. GRB030329, SPM optical observations (Correction of GCN2075 R band)
  40. GRB 030528: Optical Observations
  41. GRB 030528: tentative NIR counterpart
  42. GRB 030528, radio observations
  43. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  44. GRB030329, further radio observations at GMRT
  45. GRB030528, BVRI field photometry
  46. GRB030329, SPM optical observations
  47. GRB030528: Chandra TOO Planned
  48. GRB 030519B: optical observations.
  49. MASTER: optical observation GRB030601
  50. GRB030528(=H2724): Revised SXC Localization
  51. GRB 030329: optical observations
  52. GRB 030329/SN 2003dh: Jitter Episode
  53. GRB 030528, Teramo optical observation
  54. GRB 030528 Bisei optical observation
  55. GRB030528 (H2724): A long GRB localized by HETE
  56. GRB 030329: Correction to GCN 2254
  57. GRB 030329: Optical Observations
  58. GRB 030528: Optical observations at RIKEN
  59. GRB 030528 (=H2724) Kyoto optical observation
  60. IPN triangulation of GRB030523B (annulus)
  61. GRB 030416: Optical Observations
  62. GRB 030329: optical photometry at various french observatories
  63. GRB 030329: optical photometry at Belesta observatory (France)
  64. GRB030329, Optical observations
  65. GRB 030329/SN 2003dh: Possible increase in brightness
  66. GRB 030329: HST ACS Observations of the Host
  67. GRB 030329 Optical Observations
  68. GRB030329: XMM-Newton observation
  69. GRB 021004: HST observations
  70. GRB030324: Further Observations of the Candidate Optical Afterglow
  71. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  72. GRB 030418: Second Epoch Optical Observations with Magellan
  73. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  74. IPN triangulation of GRB030518B (annulus)
  75. GRB 030329: Optical limit (contemporaneous imaging)
  76. IPN triangulation of GRB030509 (small errror box)
  77. GRB030329: RTT150 optical observations
  78. GRB030329, BVRI photometry
  79. GRB030429, refiend optical brightness
  80. GRB 030329: Optical limit (contemporaneous photography)
  81. GRB030418, BVRcIc field photometry
  82. GRB 030429: Redshift of neighbor galaxy
  83. GRB030429, BVRcIc field photometry
  84. GRB030429: RTT150 optical obs., correction to GCN 2208
  85. GRB 030329: High-Resolution Spectroscopy of the Host
  86. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  87. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  88. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  89. GRB030429: RTT150 optical observations, a possible host galaxy
  90. GRB030329: RTT150 optical observations and upper limit for a host
  91. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  92. GRB030501, optical observation
  93. GRB030501 observation report
  94. GRB030329: RTT150 optical observations and upper limit for a host
  95. GRB 030429: Radio Observations
  96. GRB 030429: redshift from VLT spectroscopy
  97. GRB 030429: IR photometry with IRSF/SIRIUS
  98. GRB 030329 Optical Observations
  99. GRB030328, optical observation
  100. GRB030429: Optical Observations

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