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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"

5031 results found.

  1. GRB030329: final R-band light curve by MASTER
  2. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  3. GRB 030329: SARA Optical Observations
  4. GRB 030329, BRI photometry
  5. Further AAVSO V,B,R observations of GRB030329
  6. GRB 030329: SARA Optical Observations
  7. GRB 030329: Observations with ANDICAM
  8. GRB030329: further optical photometry and evidence for a light curve discontinuity
  9. GRB 030329: Correction to GCN 2056
  10. AAVSO V & R observations of GRB030329
  11. GRB 030329: optical observations
  12. GRB030329 15 GHz radio observation
  13. 030331 NOT A GRB
  14. GRB030329: R and B observations
  15. GRB030329, SPM optical observations
  16. GRB 030329: Optical Decay
  17. GRB030329: optical spectroscopy with the TNG
  18. GRB 030328 Optical Observations
  19. GRB030328: Decay index
  20. GRB030323 optical observations
  21. GRB030323: Detection on 2003/03/24
  22. GRB 030323: SARA Optical Observations
  23. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  24. GRB 030227: Optical limit at RIKEN
  25. GRB 030226 Optical observations
  26. Chandra detection of the X-ray afterglow of GRB 030226
  27. GRB030227: Kiso optical upper limit
  28. 030302: NOT A GRB
  29. Possible break in the GRB 030226 light curve
  30. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  31. GRB 030226 simultaneous optical observations
  32. GRB030226: Optical decay index
  33. GRB030131: Candidate Optical Afterglow
  34. GRB 030131: afterglow candidate
  35. GRB 030115, simultaneous observations by BOOTES-1
  36. GRB 030115: Radio Observations
  37. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  38. GRB 030115, optical candidate
  39. Possible GRB030113 seen by SPI ACS
  40. Probable GRB030112B seen by SPI ACS
  41. Probable GRB030112 seen by SPI ACS
  42. Possible GRB030111 seen by SPI ACS
  43. Possible GRB030110b seen by SPI ACS
  44. Possible GRB 030110 seen by SPI ACS
  45. GRB021112 (=H2448): A Long GRB Localized by HETE
  46. GRB021104: possible optical afterglow
  47. GRB021016, optical observations
  48. GRB021004: Optical Observations
  49. GRB021004: BVRc photometry
  50. GRB021004 radio observation
  51. GRB 021004: Optical Decay
  52. GRB 021004: Optical Observations
  53. GRB 021004: Optical Observations
  54. GRB 021004, optical observations
  55. GRB 021004 radio search
  56. INTEGRAL GRBs added to GCN
  57. GRB 020812: early time optical observation at Ouda Station
  58. Early Time Limits for GRB020813
  59. GRB 020813 Afterglow Observations; Possible break
  60. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  61. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  62. IPN triangulation of GRB020714
  63. IPN triangulation of GRB020714
  64. GRB 020625, optical observations
  65. AXP 1E2259+586 optical observations
  66. IPN detection of possible bursts from SGR1806-20
  67. GRB 020409: No Evidence for an Optical Afterglow
  68. GRB020331 optical observations with RIMOTS
  69. Short RXTE/ASM transient 020406; may be a GRB
  70. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  71. GRB011212: Optical Observations
  72. Bepposax GRB020322 The second springtime BSAX GRB
  73. GRB 020317 : KISO Optical Observations
  74. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  75. GRB020127 Optical Observations
  76. GRB011212: Optical observations at Gunma
  77. GRB 011211, Optical Observations
  78. GRB 011130: Optical Observations of Chandra Sources
  79. GRB 011130 I-band Observation
  80. GRB011130 (XRF011130) SDSS PT i-band observations
  81. XRF011130: Infrared Observations
  82. GRB011130, Radio Observations
  83. GRB010921, optical observation
  84. GRB010921 Optical Observations
  85. SGR1900+14 burst seen by HETE: BeppoSAX data
  86. GRB 010629 Optical Observations
  87. SGR1900+14: High Fluence Burst Localized by HETE
  88. GRB010326: Localization by HETE
  89. Sub-millimeter Excess/GRB 010222
  90. GRB010222: Sub-millimeter detection
  91. GRB010214 Optical Observation
  92. CORRECTION to XMM-Newton observation of GRB001025
  93. XMM-Newton observation of GRB001025
  94. CORRECTION TO IPN/RXTE ERROR BOX FOR GRB001025
  95. ASM Localization of GRB 001025
  96. GRB 001007, BVR-band observations
  97. GRB000926 - Amateur Optical Observations
  98. GRB000926 optical observations
  99. GRB 000615, near-infrared observations
  100. IPN triangulation of GRB000516

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