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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"

28125 results found.

  1. GRB/XRF040912,optical observations
  2. GRB 040912, BVRI observations
  3. Optical observations of field of GRB040912
  4. HETE 3557: Optical observations
  5. GRB040903 - A XRF?
  6. GRB040827: analysis of the XMM-Newton observation
  7. GRB040903, REM near-IR observation
  8. Very bright burst detected from SGR 1806-20
  9. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  10. Possible GRB 040903 - further analysis
  11. GRB 040827 - Radio Observations
  12. XMM-Newton Images of GRB 040827
  13. GRB 040827: optical and NIR observations at the VLT
  14. GRB 040827: UKIRT - 2nd epoch K-band imaging
  15. GRB 040827: 2nd epoch of Magellan K-band imaging
  16. GRB 040827: K imaging - no evidence of variability
  17. GRB 040827: Detection of NIR afterglow
  18. GRB040827 XMM-Newton observation
  19. GRB040825A: optical limit before GRB
  20. GRB 040825B: Optical observations
  21. GRB 040827 : Planned XMM-Newton observation
  22. GRB040825B, BVRcIc field photometry
  23. GRB040825A, BVRcIc field photometry
  24. GCN GRB OBSERBATION REPORT
  25. GRB 040825A,optical observations
  26. GRB040825A: optical observations
  27. GRB040825B: optical observations
  28. MASTER: GRB040825b optical observation
  29. GRB 040825: Optical observations
  30. XRF040812: possible afterglow second Chandra observation
  31. GRB 040812: Second epoch CXO Observations
  32. GRB040823,optical observation
  33. XRF040812: GMRT observations
  34. XRF 040812: optical observation at VLT
  35. GRB 040812: Optical counterparts of CXO sources
  36. XRF040812: possible afterglow
  37. CXO observation of GRB 040812
  38. GRB 040812: radio observations
  39. GRB040812, optical/IR observations
  40. GRB 040812: a long GRB detected by INTEGRAL
  41. XRF040701: Optical Observations at ESO
  42. GRB 040730, infrared observations
  43. GRB 040730: a long GRB detected with INTEGRAL
  44. Ongoing activity of SGR 1806-20
  45. GRB040624: optical monitoring at TNG
  46. XRF 040701 - optical observations of the decaying Chandra source
  47. XRF040701: Second-Epoch Chandra Observations
  48. XRF040701: VLA Observations
  49. XRF040701: First-Epoch Chandra Observations
  50. GRB040624, optical observations
  51. GRB040706:observation at University of Miyazaki
  52. Optical Observations of GRB040624
  53. GRB 040624: optical observations at TNG and VLT
  54. MASTER: GRB 040624 optical observation after 0,48d
  55. GRB 040624, optical observations
  56. GRB 040624 - A long GRB detected with INTEGRAL
  57. GRB 030329: Rebrightening of hyperluminal ejecta.
  58. IPN Summary of SGR1806-20 Activity in 2004
  59. SGR 1806-20: no IR variability of the proposed counterparts
  60. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  61. SGR 1806-20, potential NIR counterpart
  62. GRB 040606: Optical observations
  63. MASTER: HETE Alert 3274 optical observation
  64. Activivty of SGR 1806-20
  65. GRB 040511, very fast decay?
  66. GRB 030324: Detection and Color of Host Galaxy
  67. GRB 040511: NIR observations with REM
  68. GRB040511: Candidate optical/NIR afterglow
  69. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  70. GRB 040511: Second Epoch Optical Observations
  71. GRB 040511: Optical observations
  72. GRB 040511: Optical Observations
  73. GRB040511: Optical Observations
  74. GRB040511: Optical Observations
  75. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  76. GRB 040423 (=H3175): A Long GRB Localized by HETE
  77. GRB040422 : I-band follow-up observation at Lulin Observatory
  78. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  79. GRB040422, BVRcIc field calibration
  80. GRB 040422,optical observation
  81. GRB 040422: a long GRB detected with INTEGRAL
  82. GRB 040403, deep optical observations
  83. MASTER: HETE Alert 3163, 3167 technical optical observation
  84. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  85. GRB 040403: Optical observations
  86. GRB 040403: a long GRB detected with INTEGRAL
  87. GRB040323: NIR Observations and Variable Object
  88. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  89. GRB 040323, a dark GRB ?
  90. GRB 040323: a long GRB detected with INTEGRAL
  91. GRB040223: Deep NIR NTT data re-analysis
  92. GRB 040223: XMM-Newton results
  93. GRB040223, improved XMM position
  94. GRB 031203, possible supernova
  95. MASTER: RXTE GRB040308 optical observation
  96. IBAS results on a burst from SGR1806-20
  97. INTEGRAL detection of activity from SGR1806-20
  98. RXTE GRB040229 optical observation: no candidate
  99. GRB 040228 Optical observations
  100. GRB040228 : KISO optical follow-up observation

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