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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"

45494 results found.

  1. GRB 040730: a long GRB detected with INTEGRAL
  2. Ongoing activity of SGR 1806-20
  3. GRB040624: optical monitoring at TNG
  4. XRF 040701 - optical observations of the decaying Chandra source
  5. XRF040701: Second-Epoch Chandra Observations
  6. Cancellation of IBAS/INTEGRAL GRB alerts
  7. XRF040701: VLA Observations
  8. XRF040701: Magellan Spectroscopy of Chandra Source #2 Associated Galaxy
  9. XRF040701: First-Epoch Chandra Observations
  10. IBAS Alert 1836: NOT a real GRB
  11. GRB040709 J,H-band observations
  12. GRB040624, optical observations
  13. GRB040706:observation at University of Miyazaki
  14. XRF 040701, optical observations
  15. XRF040701 (=U11548): a bright XRF detected by HETE
  16. GRB 040624: optical observations
  17. Optical Observations of GRB040624
  18. GRB 040624: optical observations at TNG and VLT
  19. MASTER: GRB 040624 optical observation after 0,48d
  20. GRB 040624: R-band observations
  21. GRB 040624, optical observations
  22. GRB 040624 - A long GRB detected with INTEGRAL
  23. GRB 030329: Rebrightening of hyperluminal ejecta.
  24. IPN Summary of SGR1806-20 Activity in 2004
  25. GRB040511: Retraction of redshift identification
  26. SGR 1806-20: no IR variability of the proposed counterparts
  27. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  28. SGR 1806-20, potential NIR counterpart
  29. GRB 040606: Optical observations
  30. MASTER: HETE Alert 3274 optical observation
  31. Activivty of SGR 1806-20
  32. IPN triangulation of an intense intermediate burst from SGR1806-20
  33. GRB 040511, very fast decay?
  34. GRB 030324: Detection and Color of Host Galaxy
  35. GRB 040511: NIR observations with REM
  36. GRB040511: Redshift identifcation
  37. GRB 040511: Optical limit
  38. GRB040511: Candidate optical/NIR afterglow
  39. IBAS GRB Alerts n.1785 to 1791
  40. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  41. GRB 040511: Second Epoch Optical Observations
  42. GRB 040511: Optical observations
  43. GRB 040511: Optical Observations
  44. GRB040511: Optical Observations
  45. GRB040511: Optical Observations
  46. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  47. IBAS GRB Alert number 1774: NOT a real GRB
  48. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  49. IBAS Alerts 1771 and 1772: NOT a real GRB
  50. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  51. IPN triangulation of GRB040425 (=H3183)
  52. On Line Availability of Archival HETE Fregate Data and Lightcurves
  53. GRB040422: optical observations at Xinglong Observatory
  54. GRB040422: optical observations at CrAO
  55. GRB 040423 (=H3175): A Long GRB Localized by HETE
  56. GRB040422, optical observations at Loiano
  57. GRB040422 : I-band follow-up observation at Lulin Observatory
  58. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  59. GRB040422, BVRcIc field calibration
  60. GRB 040422,optical observation
  61. GRB040422: optical and NIR observations at the VLT
  62. GRB 040422: a long GRB detected with INTEGRAL
  63. GRB 040403, deep optical observations
  64. MASTER: HETE Alert 3163, 3167 technical optical observation
  65. INTEGRAL-SPI/ACS GRB data: timing correction
  66. IBAS GRB alerts 1739, 1740, 1741
  67. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  68. GRB 040403: Optical Observations
  69. GRB 040403 Optical Observations
  70. GRB 040403: Optical observations
  71. GRB 040403: optical observations
  72. GRB 040403: Optical Observations
  73. GRB 040403: a long GRB detected with INTEGRAL
  74. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  75. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  76. IBAS GRB Alert 1694
  77. GRB040323: NIR Observations and Variable Object
  78. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  79. GRB 040323, a dark GRB ?
  80. short hard GRB 040322
  81. GRB 040323: a long GRB detected with INTEGRAL
  82. IBAS GRB alerts 1679, 1680, 1681
  83. GRB040223: Deep NIR NTT data re-analysis
  84. GRB 040223: XMM-Newton results
  85. GRB040223, improved XMM position
  86. IBAS Alert 1678: not a GRB
  87. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  88. GRB 031203, possible supernova
  89. MASTER: RXTE GRB040308 optical observation
  90. IBAS results on a burst from SGR1806-20
  91. INTEGRAL detection of activity from SGR1806-20
  92. RXTE GRB040229 optical observation: no candidate
  93. GRB 040228 Optical observations
  94. IPN triangulation of GRB040228 (H3066, H3067)
  95. GRB040228 : KISO optical follow-up observation
  96. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  97. GRB 040223: Deep NIR NTT observations
  98. GRB 040223 : Optical observation (non-detection)
  99. XMM-Newton Images of GRB 040223
  100. GRB 040223, VLA observations

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